JPS6350457Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

TECHNICAL FIELD The present invention relates to a baffle plate mounting structure in which the peripheral edge of the buffle plate is sealed and mounted between the bottom of a crankcase and an oil pan in an internal combustion engine.

[Conventional technology and problems]

As shown in FIG. 1, the engine body 1 is sometimes installed under the cargo bed of a vehicle, etc., tilted from a vertical position.
A large amount of oil in the oil pan 2 flows into the crank chamber 4 of the crankcase 3 and accumulates, and as a result, the web 6 of the crankshaft 5 dips into the oil during rotation and agitates the oil, or the web 6 causes oil The droplets block the oil return passage 8 from the rocker chamber 7, causing problems such as oil blowing.
Therefore, in order to prevent oil agitation power loss and oil blowing due to the web 6, a buttful plate 10 equipped with a reed valve 9 is installed between the crankcase 3 and the oil pan 2, and the crank chamber 4 is
It is known that a method of pushing oil toward the oil pan 2 of the crank chamber 4 using the pulsating pressure of the engine is effective. In this case, as shown in FIG.
and are fixed together by tightening the oil pan mounting tightening bolts 11. Regarding the seal between the buttful plate 10, the crankcase bottom 3a, and the oil pan flange 2a, the conventionally commonly used cork gasket has problems with workability, torque drop, and leakage caused by direct immersion in oil. Therefore, it is desired to use a rubber-based sealing material 12 such as a pre-coated bead-shaped silicone rubber. By the way, the sealing material 12 does not need to be applied to the entire mounting surface, but is applied locally to the inner side of both sides of the peripheral edge part 10a of the buttful plate as shown in the figure, and is made of sheet metal with low flatness and rigidity. In order to improve the sealing performance of the member, it is necessary to have a predetermined thickness. Therefore, at the tightening bolt 11, a gap corresponding to the thickness of the sealing material 12 is created between the buttful plate 10, the crankcase 3, and the oil pan 2, and the tightening torque when tightening the bolt 11 is reduced. All of the torque is applied to the sealing material 12, and particularly strong torque is applied to the vicinity of the bolt 11. As a result, the sealing material 12 is damaged due to excessive tightening, and the torque drop changes over time due to the sealing material 12 becoming stale, resulting in problems such as the need to delicately adjust the tightening torque of the bolt 11 during assembly. As prior art related to the present invention, there are, for example, Japanese Utility Model Application Publications No. 50-134539 and Japanese Utility Model Application Publication No. 50-135839, but these use a normal gasket as a sealing material, and the present invention This is different from the case of bead-shaped rubber sealing material, which is the target of this process. Regarding the installation of a member similar to the buttful plate 10 of the present invention, there is, for example, Japanese Utility Model Application Publication No. 51-97634, in which the damping plate is supported together with the oil pan by an elastic member. This is different from installations that include seals. In view of the structural problems caused by the conventional technology, the present invention has been developed to reduce the burden of bolt tightening torque on the bead-shaped rubber sealing material and improve the durability of the sealing material. The purpose is to provide a mounting structure for the plate.

[Means to solve the problem]

For this purpose, the structure of the present invention focuses on the fact that there is a gap between each member at the tightening bolt location, and creates elastic projections by ribs or folds on both sides of the bolt hole location on the periphery of the buttful plate. They are formed concentrically, and the elastic protrusion fills the gap between the peripheral edge of the buttful plate, the bottom of the crankcase, and the oil pan flange, and receives bolt tightening torque.

【Example】

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings. According to the first embodiment of the present invention shown in FIG.
A rib 14 protruding slightly more than the thickness of 2 is concentrically formed. As a result, during assembly, the ribs 14 on the peripheral edge 10a of the buttful plate 10 come into direct contact with the crankcase bottom 3a and the oil pan flange 2a, filling the gap between these members, and the bolts 11 When tightening, the flange portion 2a of the oil pan 2 and the bottom portion 3a of the crankcase 3 are pressed together with the ribs 14 of the buttful plate 10, and they are firmly tightened and fixed together.
As the rib 14 becomes flattened when the bolt is tightened, the bead-shaped rubber sealing material 12
is brought into pressure contact with the crankcase bottom portion 3a and the oil pan flange portion 2a with a force that is a fraction of the tightening torque, resulting in a sealable state. According to the second embodiment of the present invention shown in FIG. 4, a disc spring-like fold 15 is formed around the bolt hole 13 of the buff-full plate peripheral portion 10a. It acts on

[Effect of the idea]

As is clear from the above description, according to the present invention, the buttful plate 10 is mounted between the crankcase 3 and the oil pan 2 by tightening them together with the tightening bolts 11, and there is a bead-shaped gap between each member. In the case of being sealed with the rubber sealing material 12,
Rib 14 or fold 15 on the side of the full plate
The bolt tightening torque is applied by the elastic protrusion, so that the mounting of the buttful plate 10 and the oil pan 2 becomes strong. On the other hand, since only enough pressing force is applied to the sealing material 12 for sealing action, excessive compression of the sealing material 12 is eliminated, various problems of the conventional ones are eliminated, and its durability and sealing effect are improved. improves.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a mounting state of a buttful plate to which the present invention is applied, Fig. 2 is a cross-sectional view showing a conventional mounting structure, and Fig. 3 is a cross-sectional view showing a first embodiment of the present invention. , FIG. 4 is a sectional view showing the second embodiment. 2...Oil pan, 3...Crankcase, 3
a...bottom, 9...reed valve, 10...buttful plate, 10a...periphery, 11...tightening bolt, 12...sealing material, 13...bolt hole, 14
...Rib, 15...Fold back.

Claims (1)

[Scope of utility model registration request] In the case where the peripheral part of the buttful plate is mounted between the bottom of the crankcase and the oil pan by bolting together, and a bead-shaped rubber sealing material is interposed between each of these parts, the above-mentioned buttful plate 1. A mounting structure for a buttful plate, characterized in that elastic protrusions are formed concentrically on both sides of bolt holes in the peripheral edge, and the bolt tightening torque is received by the elastic protrusions.