JP2008184138A - Heat insulation board for electrically-operated power steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat insulation board for an electrically-operated power steering device having a sufficient heat insulation effect for preventing heat from being transferred from a vehicle engine and an exhaust pipe and the like to the electrically-operated power steering device. <P>SOLUTION: A heat insulation board 31 extends along a steering gear box 7 and has a heat dissipation section 69 equipped with a plurality of beads 71. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a technique for preventing heat from being transmitted from a vehicle engine, an exhaust pipe or the like to an electric power steering apparatus.

Conventionally, a heat shield has been used for heat insulation between components mounted on a vehicle. For example, Patent Document 1 discloses a heat shield plate that prevents heat from being transferred from the exhaust pipe to the fuel tank, and Patent Document 2 discloses a heat shield plate that prevents heat from being transferred from the exhaust pipe to the propeller shaft. Is disclosed. The heat shield plates disclosed in Patent Documents 1 and 2 both have a heat radiating portion to improve heat radiating properties.
JP-A-8-169244 JP-A-10-119827

  Since the electric power steering apparatus affects the strength and durability, the vehicle environment in which the electric power steering apparatus can be mounted has been limited. In order to suppress the influence of heat on the electric power steering system by surrounding high-temperature components, there is a conventional technology to provide a heat shield, but in a vehicle environment exposed to higher temperatures, the heat shield has a sufficient heat shield effect. It wasn't.

  The present invention has been made in view of the above problems, and is a heat shield for an electric power steering device having a sufficient heat shielding effect to prevent heat from being transmitted from a vehicle engine, an exhaust pipe or the like to the electric power steering device. The purpose is to provide a board.

  In order to solve the above-described problem, in the present invention, in the heat shield for an electric power steering apparatus, which is fixed to a steering gear box extending in the lateral direction of the vehicle and prevents heat from being transmitted from surrounding parts, the heat shield is It has a heat radiating portion extending along the steering gear box and having a plurality of beads.

  ADVANTAGE OF THE INVENTION According to this invention, it can prevent effectively that heat is transmitted from the engine of an vehicle, an exhaust pipe, etc. to an electric power steering device.

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

  FIG. 1 is a rear view of an electric power steering apparatus having a heat shield plate for an electric power steering apparatus according to an embodiment of the present invention as viewed from the rear of the vehicle. FIG. 2 is an enlarged top view of a portion where the heat shield plate of the electric power steering apparatus shown in FIG. 1 is attached. FIG. 3 is an enlarged partial cross-sectional view along the line AA in the portion where the heat shield plate of the electric power steering apparatus shown in FIG. 1 is attached. Here, what is shown by the cut surface is a steering gear box and a heat shield. Moreover, the arrow in FIG. 2 and FIG. 3 has shown the vehicle rear shown with the code | symbol R. FIG. 4A and 4B are four views of a heat shield for an electric power steering apparatus according to an embodiment of the present invention, where FIG. 4A is a front view, FIG. 4B is a top view, and FIG. 4C is a rear view. d) is a side view. It should be noted that the front and rear directions and the horizontal directions used in the description in the present specification correspond to the respective directions in the vehicle.

  As shown in FIG. 1, an electric power steering apparatus 1 includes a steering shaft 3 and the like that attach a steering wheel (not shown) at the rear end, and a rack and pinion type that is connected to the vehicle front end side and transmits steering torque to wheels. A steering gear 5 is provided. The steering gear 5 is housed in a steering gear box 7 and extends toward both wheels in the lateral direction of the vehicle. Reference numeral 9 denotes an electric motor, and reference numeral 11 denotes a connector for energization.

  As shown in FIGS. 1 to 3, the connector 11 includes a coupler mounting plate 17 fixed to the upper surface of the steering gear box 7 by connector bolts 13 and 15, and a wire harness from both ends attached to the coupler mounting plate 17. It consists of four couplers 19, 21, 23, 25 to be connected. The coupler mounting plate 17 is formed by molding a metal plate into a bowl shape as a whole, and the shape is devised to facilitate wiring. In addition, the coupler mounting plate 17 is formed with a deformed portion 27 that extends in such a manner that the center of the width conforms to the bowl shape. The deforming portion 27 is formed in a groove shape that is recessed in the thickness direction of the coupler mounting plate 17 and increases the rigidity.

  As shown in FIGS. 1 and 3, a heat source 29 such as an exhaust pipe extends below the steering gear box 7 in the vehicle front-rear direction, and further, a heat shield that blocks radiation from the heat source 29. A plate 31 is attached.

  As shown in FIGS. 1 to 4, the heat shield 31 is formed in a shape that surrounds the lower half of the steering gear box 7 over a predetermined length in the lateral direction of the vehicle, and has a substantially semicircular cross section. The curved portion 33 is provided. The bending portion 33 is provided with a total of three attachment portions 35, 37, 39 formed by denting from the outside to the inside, one on the front side and two on the rear side.

  On the side surface of the steering gear box 7, three projecting portions 41 that project outward and come into contact with the mounting portions at positions facing the three mounting portions 35, 37, 39 formed on the curved portion 33 of the heat shield plate 31. , 43, 45 are formed. Each attachment portion 35, 37, 39 has a through hole 47, 49, 51 formed in the center, and is continuous with the female screw formed in each projection. By attaching hexagon bolts 53, 55, and 57 with flanges for heat shield plates through the through holes from the outside of the curved portion 33, and tightening the female screws, the mounting portions 35, 37, and 39 and the protruding portions 41 and 43 are provided. 45, that is, the heat shield plate 31 and the steering gear box 7 are fixed.

  The curved portion 33 of the heat shield plate 31 is formed with four first linear deformable portions 59, 61, 63, 65 that are recessed inwardly and extend in the lateral direction of the vehicle, and the bottom of the curved portion 33 is recessed outwardly. One second linear deformation portion 67 extending in the vehicle lateral direction is formed. By forming the first and second linear deformation portions, the rigidity of the bending portion is improved.

  The heat shield plate 31 is bent back and forth at the upper portion of the curved portion 33 to have a flange shape, and the rear flange is a heat radiating portion 69. The upper surface of the heat dissipating part 69 has a rectangular shape with substantially the same width as that of the curved part 33, and a plurality of beads 71 formed in a groove shape extending in the front-rear direction are arranged on the upper surface. While providing the heat dissipation part 69 in the heat shield 31 and forming the beads 71 in the heat dissipation part 69 to increase the surface area of the heat dissipation part 69, the heat dissipation can be improved. A side flange portion 73 is spot welded to the side surface of the curved portion 33. Reference numeral 75 indicates a spot welding allowance formed on the side surface of the curved portion 33.

  Further, in order to further improve the heat dissipation, the heat dissipating unit 69 determines a place at a position as far as possible from the heat source 29 in the vehicle in consideration of the air flow during traveling.

  Further, in order to prevent the radiant heat from the heat shield plate 31 from being transmitted to the electric power steering apparatus 1, the heat radiating portion 69 is set so as not to face the steering gear box 7.

  According to the heat shield plate of the present embodiment, it is possible to effectively prevent heat from being transmitted from a heat source such as a vehicle engine or an exhaust pipe to the electric power steering apparatus. In addition, it effectively dissipates heat transferred from the heat source to the heat shield plate, suppresses the temperature rise of the heat shield plate, and prevents the heat shield plate from indirectly becoming a heat source in a vehicle environment exposed to high temperatures. .

  In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation is possible.

It is the rear view which looked at the electric power steering device which attached the heat shield for electric power steering devices concerning one embodiment of the present invention from the back of vehicles. It is an enlarged top view of the part to which the heat shield plate of the electric power steering apparatus shown in FIG. 1 was attached. It is an expanded partial sectional view along the AA line in the part to which the heat shield plate of the electric power steering apparatus shown in FIG. 1 was attached. It is a 4th view of the heat shield for electric power steering devices concerning one embodiment of the present invention, (a) is a front view, (b) is a top view, (c) is a back view, (d) is a side view FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Electric power steering device 7 ... Steering gear box 29 ... Heat source 31 ... Heat shield plate 69 ... Heat radiation part 71 ... Bead

Claims (1)

In a heat shield for an electric power steering device, which is fixed to a steering gear box extending in the lateral direction of the vehicle and prevents heat from being transmitted from surrounding parts,
The heat insulating plate for an electric power steering apparatus, wherein the heat insulating plate has a heat radiating portion extending along the steering gear box and having a plurality of beads.

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