Vehicle equipment mounting structure

Abstract

To provide an on-vehicle device mounting structure which enables reduction of abnormal noise occurring from an on-vehicle device.SOLUTION: An on-vehicle device mounting structure includes: an on-vehicle device 20 mounted on an engine compartment 10 of a vehicle; an intake pipe 30 which is disposed in the engine compartment 10 and guides air to an engine; an air cleaner 40 which is provided connected to the intake pipe 30 in the engine compartment 10 and filters the air guided to the engine; and a bracket 50 which connects the on-vehicle device 20 with the intake pipe 30.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a mounting structure for in-vehicle equipment. [Background technology]

[0002] A power control unit is one of the on-board devices installed in the engine compartment of a vehicle. In order to efficiently cool the power control unit, it is known to place the power control unit in the engine compartment so that the power control unit faces the radiator grille and the mounting surface of the inverter unit is generally perpendicular to the front-rear direction of the vehicle (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-83317 A Summary of the Invention [Problem to be solved by the invention]

[0004] When on-board equipment mounted inside the engine compartment vibrates due to the vibrations of the vehicle, it may emit abnormal noises and reduce comfort.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to reduce abnormal noise generated from in-vehicle equipment. [Means for solving the problem]

[0006] The present invention is installed in the engine compartment of a vehicle. A case and a lid fastened to the case. an in-vehicle device; an intake pipe disposed within the engine compartment and directing air to an engine; and an air cleaner disposed within the engine compartment and connected to the intake pipe and filtering the air directed to the engine; The intake pipe is provided so as to extend from the in-vehicle device toward the intake pipe, and one end of the intake pipe is connected to a central region of the in-vehicle device when the in-vehicle device is viewed from above, and the other end of the intake pipe is connected to the in-vehicle device. The vehicle-mounted device and the intake pipe are connected. Metal and a bracket. Effect of the Invention

[0007] According to the present invention, abnormal noise generated from in-vehicle equipment can be reduced. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a side view showing a mounting structure for an in-vehicle device according to a first embodiment. [Diagram 2] FIG. 2 is a side view showing a mounting structure for in-vehicle equipment in a comparative example. [Diagram 3] FIG. 3 shows the results of an experiment in which the magnitude of abnormal noise generated by the in-vehicle device was measured in the mounting structures for the in-vehicle device in Example 1 and the comparative example. [Figure 4] 4(a) and 4(b) are diagrams for explaining the reason why abnormal noise is reduced by the mounting structure of the in-vehicle device in the first embodiment. [Diagram 5] FIG. 5 is a side view showing the mounting structure of the in-vehicle device according to the second embodiment. [Figure 6] FIG. 6 is a side view showing the mounting structure of the in-vehicle device according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. EXAMPLES

[0010] Fig. 1 is a side view showing a mounting structure of an on-vehicle device 20 in the first embodiment. As shown in Fig. 1, the vehicle according to the first embodiment has an on-vehicle device 20, an intake pipe 30, an air cleaner 40, and a bracket 50 provided in an engine compartment 10 defined in the front part of the vehicle body. In addition, although not shown, an engine and a motor capable of outputting power are also provided in the engine compartment 10. Thus, the vehicle according to the first embodiment is a hybrid vehicle having an engine and a motor as power sources.

[0011] The on-board device 20 mounted in the engine compartment 10 is, for example, a DC-DC converter having a top cover 24 provided on a main body case 22 that houses a circuit board inside. The main body case 22 and the top cover 24 are fastened together by fastening members such as screws. The DC-DC converter steps down the high voltage of a battery for a hybrid vehicle and supplies it to auxiliary devices such as lights.

[0012] The intake pipe 30 (intake duct) is disposed inside the engine compartment 10. The intake pipe 30 is provided to supply air (outside air) to the engine mounted in the engine compartment 10. That is, the air (outside air) flows inside the intake pipe 30 and is supplied to the engine. The engine outputs power using air supplied via the intake pipe 30 and gasoline supplied via another system.

[0013] The air cleaner 40 is provided inside the engine compartment 10 and connected to the intake pipe 30. The air cleaner 40 filters the air that flows through the inside of the intake pipe 30 and is supplied to the engine, removing dust, foreign matter, and the like. The air cleaner 40 may be an exposed air filter, or may have a structure in which the air filter is housed in a box.

[0014] One end of the bracket 50 is directly connected to the top cover 24 of the in-vehicle device 20 by a connecting member such as a screw or adhesive, and the other end is directly connected to the intake pipe 30 by a connecting member such as a screw or adhesive. Therefore, the in-vehicle device 20 and the intake pipe 30 are connected via the bracket 50. When the top cover 24 of the in-vehicle device 20 vibrates relative to the main body side case 22 as described later, the bracket 50 is capable of vibrating (deforming) in response to the vibration of the top cover 24. That is, the bracket 50 is formed of a material with an elastic modulus and a shape that allows it to vibrate (deform) in response to the vibration of the top cover 24. For example, the bracket 50 has a shape that extends linearly and is formed of a metal such as iron. The inside of the bracket 50 may be hollow or not hollow. When the inside of the bracket 50 is hollow, the inside of the bracket 50 and the inside of the intake pipe 30 may be connected or not.

[0015] [Comparative Example] Fig. 2 is a side view showing the mounting structure of the in-vehicle device 20 in the comparative example. As shown in Fig. 2, in the comparative example, the in-vehicle device 20 and the intake pipe 30 are not connected via a bracket. The other configurations are the same as those in the first embodiment, so the description will be omitted.

[0016] In the first embodiment and the comparative example, the DC-DC converter, which is the in-vehicle device 20, has the top cover 24 fastened to the main body case 22 by fastening members such as screws. In this case, the top cover 24 may vibrate relative to the main body case 22 due to vibrations of the vehicle caused by the engine and / or the road conditions on which the vehicle is traveling, causing the in-vehicle device 20 to make abnormal noise.

[0017] Here, the loudness of the abnormal sound generated from the in-vehicle device 20 in the mounting structure of the in-vehicle device 20 in Example 1 and the comparative example was compared. FIG. 3 shows the experimental results of measuring the loudness of the abnormal sound generated from the in-vehicle device 20 in Example 1 and the comparative example. The horizontal axis of FIG. 3 is frequency (Hz), and the vertical axis is sound pressure (dB). The measurement result of Example 1 is shown by a solid line, and the measurement result of the comparative example is shown by a dotted line. The bracket 50 was made of iron, and the loudness of the abnormal sound generated from the in-vehicle device 20 was measured by a sound level meter on an actual vehicle. As shown in FIG. 3, the mounting structure of the in-vehicle device 20 in Example 1 had a lower maximum sound pressure than the mounting structure of the in-vehicle device 20 in the comparative example.

[0018] The reason why the abnormal noise generated from the in-vehicle device 20 is reduced by adopting the mounting structure of the in-vehicle device 20 of the first embodiment is considered to be as follows. Fig. 4(a) and Fig. 4(b) are diagrams for explaining the reason why the abnormal noise is reduced by the mounting structure of the in-vehicle device 20 of the first embodiment. As shown in Fig. 4(a), the in-vehicle device 20 and the intake pipe 30 are connected by the bracket 50 that can vibrate in response to the vibration generated by the in-vehicle device 20, and it is considered that the bracket 50 and the intake pipe 30 correspond to a spring with a stiffness k, and the air cleaner 40 corresponds to an auxiliary mass with a mass m, forming a dynamic damper 60. That is, as shown in Fig. 4(b), it is considered that the dynamic damper 60 is connected to the in-vehicle device 20, in which the bracket 50 and the intake pipe 30 play the role of the spring 62 with a stiffness k, and the air cleaner 40 plays the role of the auxiliary mass 64 with a mass m.

[0019] The resonant frequency √(k / m) of the dynamic damper 60, which is determined by the stiffness k of the spring 62 formed by the bracket 50 and the intake pipe 30 and the mass m of the auxiliary mass 64 formed by the air cleaner 40, is adjusted to the frequency (resonant frequency) at which the sound pressure was the largest in the comparative example or a frequency f close to the frequency. As a result, when the top cover 24 of the in-vehicle device 20 vibrates with respect to the main body case 22 at the resonant frequency, the dynamic damper 60 formed by the bracket 50, the intake pipe 30, and the air cleaner 40 vibrates in the opposite phase, and as a result, it is considered that the vibration of the top cover 24 with respect to the main body case 22 is reduced. As a result, it is considered that the abnormal sound generated from the in-vehicle device 20 is reduced in the first embodiment. The resonant frequency √(k / m) of the dynamic damper 60 can be controlled by the shape, thickness, material, etc. of the bracket 50, and the resonant frequency of the dynamic damper 60 can be adjusted to a frequency at which sound pressure is to be reduced.

[0020] 1, in-vehicle device 20 mounted in engine compartment 10 and intake pipe 30 arranged in engine compartment 10 and connected to air cleaner 40 are connected by bracket 50. As a result, bracket 50, intake pipe 30, and air cleaner 40 function as dynamic damper 60 against vibrations generated in in-vehicle device 20 due to vibrations of the vehicle, thereby reducing vibrations generated in in-vehicle device 20. Therefore, abnormal noise generated from in-vehicle device 20 can be reduced.

[0021] In the first embodiment, the bracket 50 is preferably connected to a central region of the in-vehicle device 20 when the in-vehicle device 20 is viewed from above. Since the central region of the in-vehicle device 20 is a region where abnormal noise caused by vibration is likely to become loud, connecting the bracket 50 to this central region can effectively reduce abnormal noise generated from the in-vehicle device 20. The central region of the in-vehicle device 20 does not have to be the geometric center, and may be, for example, a region near the center of gravity of the upper cover 24 in the case where the in-vehicle device 20 has a main body case 22 and an upper cover 24. EXAMPLES

[0022] Fig. 5 is a side view showing a mounting structure of the in-vehicle device 20 in the second embodiment. As shown in Fig. 5, in the second embodiment, a soundproofing member 70 is provided on the in-vehicle device 20. The soundproofing member 70 is, for example, a sound absorbing member. An opening 72 is provided in the soundproofing member 70, and the bracket 50 is directly connected to the in-vehicle device 20 through the opening 72. The other configurations are the same as those in the first embodiment, and therefore description thereof will be omitted.

[0023] According to the second embodiment, a soundproofing member 70 is provided on the in-vehicle device 20. This makes it possible to reduce abnormal noise generated from the in-vehicle device 20. In addition, the bracket 50 is directly connected to the in-vehicle device 20 through an opening 72 provided in the soundproofing member 70. This makes it possible to reduce vibrations generated in the in-vehicle device 20 by the dynamic damper 60 composed of the bracket 50, the intake pipe 30, and the air cleaner 40, and therefore makes it possible to reduce abnormal noise generated from the in-vehicle device 20. EXAMPLES

[0024] Fig. 6 is a side view showing the mounting structure of the in-vehicle device 20 in the third embodiment. As shown in Fig. 6, in the third embodiment, a bracket 50a connecting the in-vehicle device 20 and the intake pipe 30 can be separated into a first portion 52 and a second portion 54. The first portion 52 and the second portion 54 are connected by a fastening member 56 such as a screw or a bolt. The other configurations are the same as those in the first embodiment, and therefore the description will be omitted.

[0025] In the first and second embodiments, the bracket 50 connecting the in-vehicle device 20 and the intake pipe 30 is made of one member that cannot be separated. However, this is not limited to this, and the bracket 50a may be separated into a first part 52 and a second part 54 as in the third embodiment. The bracket 50a is not limited to being separated into two parts, and may be separated into three or more parts. When the bracket 50a is separated into two or more parts, the in-vehicle device 20 and the intake pipe 30 can be easily connected to each other by the bracket 50a even when the relative positions of the in-vehicle device 20 and the intake pipe 30 are various.

[0026] In the first to third embodiments, the in-vehicle device 20 is a DC-DC converter, but the present invention is not limited to this and may be, for example, a power conversion device other than a DC-DC converter, an engine, a transaxle, or a battery.

[0027] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0028] 10 Engine Compartment 20 In-vehicle equipment 22 Main unit case 24 Top lid 30 Intake pipe 40 Air Cleaner 50, 50a bracket 52 Part 1 54 Part 2 56 Fastening members 60 Dynamic Damper 62 Spring 64 Auxiliary mass 70 Soundproofing materials 72 Aperture

Claims

[Claim 1] An in-vehicle device that is mounted in an engine compartment of a vehicle and has a case and a lid fastened to the case; an intake pipe disposed within the engine compartment for directing air into the engine; an air cleaner provided in the engine compartment and connected to the intake pipe, for filtering the air introduced into the engine; A mounting structure for an on-vehicle device comprising: a metal bracket extending from the on-vehicle device toward the intake pipe, one end of which is connected to a central region of the on-vehicle device when the on-vehicle device is viewed in a plan view, and the other end of which is connected to the intake pipe, thereby connecting the on-vehicle device to the intake pipe.

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