Vehicle power plant

Abstract

To provide a vehicle power plant including a reinforcement member that can function as a rigid body and vibration damping in a compatible manner.SOLUTION: A vehicle power plant of the present invention includes: an engine; a transaxle attached to a side portion of the engine and provided with a power transmission device and an electrical rotating machine; a power control unit disposed on an upper surface of a case of the transaxle and configured to control the electrical rotating machine; and a reinforcement member bridged between the engine and the power control unit. The reinforcement member is formed of a plurality of iron wires filled into a cylindrical pipe.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a vehicle power plant. [Background technology]

[0002] Patent Document 1 discloses a structure in which particulate matter is packed and supported in order to suppress high-frequency components during vibration transmission. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 07-208543 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the structure disclosed in Patent Document 1, which packs and supports particulate matter, does not function as a rigid body and requires other parts to ensure rigidity, which may limit installation. For example, a reinforcing member that is provided in a vehicle power plant that includes an engine, a transaxle, and a power control unit and that spans between the engine and the power control unit is required to function both as a rigid body and as a vibration damper.

[0005] The present invention has been made in consideration of the above-mentioned problems, and its object is to provide a vehicle power plant in which a reinforcing member can simultaneously function as a rigid body and as a vibration damper. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the vehicle power plant of the present invention is a vehicle power plant comprising an engine, a transaxle attached to the side of the engine and equipped with a power transmission device and a rotating electric machine, a power control unit provided on the upper surface of a case of the transaxle and controlling the rotating electric machine, and a reinforcing member bridged between the engine and the power control unit, wherein the reinforcing member is constructed by stuffing a plurality of iron wires into a cylindrical pipe. Effect of the Invention

[0007] The vehicle power plant according to the present invention has an advantage that the reinforcing member bridged between the engine and the power control unit can simultaneously function as a rigid body and as a vibration damper. [Brief description of the drawings]

[0008] [Figure 1] Fig. 1(a) is a side view and Fig. 1(b) are a top view and a schematic view of a vehicle power plant according to an embodiment of the present invention. [Diagram 2] Fig. 2(a) is a perspective cross-sectional view of the stiffener according to the embodiment, and Fig. 2(b) is a cross-sectional view of the stiffener according to the embodiment as viewed from the axial direction. [Diagram 3] FIG. 3 is a graph showing the stiffener excitation point response. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle power plant according to the present invention will be described below. However, the present invention is not limited to the embodiment.

[0010] FIG. 1(a) is a side view showing a schematic configuration of a vehicle power plant according to an embodiment. FIG. 1(b) is a top view showing a schematic configuration of a vehicle power plant according to an embodiment. As shown in FIG. 1(a) and FIG. 1(b), the vehicle power plant according to the embodiment is composed of an engine 1, a PCU (power control unit) 2, a transaxle 3, a stiffener 4, and the like. Power output from the engine 1 is transmitted to the transaxle 3, and is transmitted from the transaxle 3 to wheels (not shown). The transaxle 3 is composed of a power transmission mechanism such as a transmission and a differential mechanism. In addition, this vehicle is a hybrid vehicle, and a first rotating electric machine and a second rotating electric machine, which are rotating electric machines that function as a power source, are housed in a case of the transaxle 3. A PCU 2 is fixedly mounted on the upper surface of the case of the transaxle 3. An inverter, a control device, and the like are housed in a case of the PCU 2. The inverter of the PCU 2 is electrically connected to the first rotating electric machine and the second rotating electric machine. Furthermore, the control device of PCU2 controls the first rotating electric machine and the second rotating electric machine. The power control unit and stiffener 4 are reinforcing members of a pipe structure provided at a location where the amplitude of bending vibration is large in a vehicle power plant, and one end side is fixed to a case upper surface of engine 1 by a fixing part 51, and the other end side is fixed to a case upper surface of PCU2 by a fixing part 52, and bridges between engine 1 and PCU2.

[0011] FIG. 2(a) is a perspective cross-sectional view of the stiffener according to the embodiment. FIG. 2(b) is a cross-sectional view of the stiffener according to the embodiment as viewed from the axial direction. As shown in FIG. 2(a) and FIG. 2(b), the stiffener 4 according to the embodiment has a pipe structure in which a plurality of iron wires 42 are packed in a cylindrical pipe 41. FIG. 3 is a graph showing the stiffener excitation point response. In FIG. 3, the example of the invention is a case in which the stiffener 4 according to the embodiment is used, and the comparative example is a case in which a stiffener of a pipe structure in which no iron wires 42 are packed in a cylindrical pipe 41 is used.

[0012] In the stiffener 4 according to the embodiment, the multiple iron wires 42 packed in the pipe 41 can act as a rigid body against low-frequency vibrations, and bending vibrations of the entire vehicle power plant can be suppressed. Also, in the stiffener 4 according to the embodiment, the multiple iron wires 42 packed in the pipe 41 can rub against each other to attenuate high-frequency vibrations caused by vibrations transmitted from the engine 1 to the transaxle 3 (PCU 2).

[0013] Therefore, in the vehicle power plant according to the embodiment, the pipe structure of the stiffener 4 spanning between the engine 1 and the PCU 2 is configured by packing a plurality of iron wires 42 into a cylindrical pipe 41, so that the stiffener 4 can function both as a rigid body and as a vibration damper. [Explanation of symbols]

[0014] 1 Engine 2 PCU 3 Transaxle 4 Stiffna 41 Pipe 42 Iron Wire 51,52 Fixed part

Claims

[Claim 1] The engine, a transaxle attached to a side of the engine and including a power transmission device and a rotating electric machine; a power control unit provided on an upper surface of a case of the transaxle and controlling the rotating electric machine; a reinforcing member extending between the engine and the power control unit; A vehicle power plant comprising: The vehicle power plant is characterized in that the reinforcing member is constructed by stuffing a plurality of iron wires into a cylindrical pipe.

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