JPS6347350Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a synthetic resin rocker cover used for internal combustion engines.

(Prior Art) Recently, due to the demand for resource conservation, efforts are being made to reduce the weight of cars in order to improve fuel efficiency. Engine-related rocker covers have been changed from conventional metal covers to lightweight and inexpensive synthetic resins.

(Problem to be solved by invention) However, since synthetic resin has poor thermal conductivity compared to metal, the heat generated by the operation of the Rocker arm is not radiated to the outside air but is stored inside the Rocker cover, resulting in a high temperature of about 150 degrees Celsius. Heat deteriorates the engine oil. In addition, the rocker cover is fixed to the cylinder block with bolts etc. via the boss part provided on the flange of the rocker cover, but the resin that is not fixed between the boss parts is subjected to stress due to the heat and deforms to curve outward. However, as a result, the flange was deformed and the gasket was displaced, making it impossible to maintain a seal with the rocker cover.

(Means for Solving the Problems) The present invention provides a synthetic resin rocker cover that solves these problems, and is a synthetic resin box with a closed top surface, an open bottom surface, and a peripheral wall between both surfaces. A flange part made of resin and provided with a plurality of boss parts is formed on the periphery of the open end of the lower surface, and thin plate-shaped metal fins are made to protrude inside and outside of the box body on the peripheral wall of the box body between the boss parts. Place vertically.

(Function) The heat generated within the rocker cover is transmitted from the fins protruding inside the rocker cover peripheral wall to the fins protruding outward, and is released to the atmosphere, thereby preventing the temperature inside the rocker cover from rising. Further, the metal fins act as beads against the deforming force acting between the boss portions of the flange, that is, on the unfixed peripheral wall portion.

(Example) The rocker cover 1 shown in FIG. 1 consists of a box made of synthetic resin and metal fins arranged on the peripheral wall of the box. The box body is box-shaped with a closed top surface and an open bottom surface, and an oil fill hole 4 is provided in the closed portion 3 of the top surface, and a storage groove for an annular gasket 9 is provided in the open bottom portion at a position symmetrical to the cylinder block (not shown). A flange portion 6 is formed, and a plurality of boss portions 5, which are holes through which bolts pass, are bored in the flange portion 6. The circumferential wall consisting of the two side walls and the two end walls of the box between the boss parts 5 has a plurality of parts that protrude vertically outward from the outer wall surface 10 of the circumferential wall by 2 to 5 mm, and also protrude from the inner side of the circumferential wall. A single metal fin 2 protruding inward from the wall surface 11 by 5 to 10 mm is disposed from the flange portion 6 to the vicinity of the upper surface closing portion 3.

The metal fins 2 are made of a metal with excellent thermal conductivity, such as an aluminum plate, and as shown in FIG. The diameter is 0.5 to 3 mm, and an L-shaped pore 12 is bored in the center. Instead of the pores 12, a plurality of 2 mm wide oval holes may be formed. The portion of the metal fin 2 located in the closing portion 3 has a width of 5 to 7 mm and a length approximately half that of the closing portion 3.

The rocker cover 1 in which the metal fins 2 are embedded is made as follows.

If necessary, a preheated metal fin 2 is placed between the bosses of the flange part in a mold shaped like a rocker cover to prevent welding, etc., and then molten resin is injected into the mold. , cool and shape. In the synthetic resin rocker cover 1 having such a structure, when the engine starts, the rocker arm also operates and gradually generates heat, raising the inside of the rocker cover 1 to a high temperature. This heat is transmitted from the inner fins 22 of the metal fins 2 embedded in the peripheral wall of the rocker cover 1, which protrude inside the rocker cover 1, to the outer fins 21, which protrude to the outside of the rocker cover 1, and is radiated into the cold outside air.

In addition, the metal fins 2 disposed between the bosses 5 of the flange 6 prevent the synthetic resin of the rocker cover, which is not fixed to the cylinder block between the bosses 5 of the flange 6, from deforming due to engine heat. It acts as a bead and suppresses the deformation of the resin against the force.

Figure 3 shows a metal fin 23 that is shaped like a gate without dividing the metal fin, and the metal fin 23 in Figure 4 is the same as in Figure 1, which is arranged perpendicularly between the bosses of the flange on the peripheral wall of the box. Fins are arranged horizontally on the metal fins of the object in a grid pattern.

(Effects of the invention) As described above, in this invention, the metal fins that protrude to the inside and outside of the box body made of synthetic resin are arranged on the peripheral wall of the box body, so the heat inside the rocker cover is quickly transferred to the outside by the metal fins. This prevents the temperature inside the rocker cover from rising and prevents engine oil from deteriorating due to heat. In addition, since metal fins are placed between the bosses of the flange, the metal fins act as beads to suppress the deformation of the synthetic resin against forces that try to deform the parts of the peripheral wall that are not fixed to the cylinder block. This allows a good seal to be maintained between the rocker cover flange and the cylinder block.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the rocker cover of the present invention. FIG. 2 is a sectional view thereof, FIG. 3 is a modification of the metal fins, and FIG. 4 is an example of the structure shown in FIG. 1 with metal fins provided laterally. 1... Rotsuka cover, 2... Metal fin, 5
...Boss part, 7... Side wall part, 8... End wall part.

Claims (1)

[Scope of utility model registration request] A box body is formed of synthetic resin, having an open bottom surface, a flange portion formed around the open end, a closed top surface, and a peripheral wall between both surfaces, and a plurality of boss portions are provided on the flange portion. A synthetic resin rocker cover with thin metal fins arranged vertically on the peripheral wall of the box between the parts and protruding from the inside and outside of the box.