JPS6025040Y2 - Engine oil pan elastic support device - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of an elastic support device for an engine oil pan, which reduces vibration and noise of the oil pan by elastically attaching the oil pan to an engine mounted on a vehicle, etc. .

Conventionally, as shown in FIG. 1, a bolt 6 is used as an elastic support device for an engine oil pan.
The oil pan 2 is fixed to the cylinder block 1 by maintaining a predetermined gap between the bolt through hole 2b of the flange 2a and the bolt 6, and as a result, the oil pan 2 is elastically supported in the vertical direction with respect to the cylinder block 1. is proposed.

However, in the conventional elastic support device, no special consideration is given structurally to the positioning between the bolt through hole 2b of the flange 2a and the bolt 6, and the management of the gap during assembly is extremely complicated. It had become.

Moreover, even if a predetermined gap is formed during assembly, horizontal vibrations of the cylinder block 1 or oil pan 2 may occur.
Due to the horizontal inertia force acting on the bolt through hole 2b
There was a problem in that the bolt 6 came into contact with the inner surface of the bolt through hole 2b as shown in FIG. 1 due to the slippage, and the vibration damping effect was significantly impaired.

In order to eliminate the above-mentioned drawbacks, this invention adhesively fixes the upper elastic body to the flange of the oil pan by aligning the axis of the bolt through hole of the upper elastic body with the axis of the bolt through hole of the flange. Bring the bolt through hole close to the bolt,
An annular gap is formed between the bolt through hole of the flange and the bolt.

An embodiment of this invention will be described below with reference to FIGS. 2 to 4.

In the figure, 11 is a cylinder block, and a plurality of screw holes 11b are bored at appropriate intervals in the circumferential direction in a mounting flange lla at the lower end of the cylinder block.

On the other hand, on the upper surface of the flange 12a of the oil pan 12, an upper elastic body 13 made of rubber and having an appropriate thickness is disposed and extends over the entire circumference. The bodies 14 are arranged at appropriate intervals in the circumferential direction.

The upper elastic body 13 and the lower elastic body 14 are connected to bolts 16.
Bolt through holes 13a and 14a are bored with an inner diameter that is approximately the same as or slightly smaller than the diameter of the bolt.

On the other hand, a bolt through hole 12b larger than the diameter of the bolt 16 is bored in the flange 12a of the oil pan 12.

Note that 15 is a holding plate that receives the lower elastic body 14 and has a bolt through hole 15a.

Further, the length of the threaded portion 16a of the bolt 16 is formed by a preset tightening amount, thereby preventing the upper elastic body 13 and the lower elastic body 14 from being compressed more than necessary.

Therefore, when assembling the oil pan 12, first align the axis of the bolt through hole 13a of the upper elastic body 13 with the axis of the bolt through hole 12b of the flange 12a,
While the lower surface of the upper elastic body 13 is adhesively fixed to the upper surface of the flange 12a by adhesive or vulcanization, the flange 12
A lower elastic body 14 with a presser plate 15 disposed on the lower surface of a
and then open each through hole 15a from below.
, 14a, 12bt When a bolt 16 is passed through 13a, and the bolt 16 is screwed into the screw hole 11b and tightened, an annular gap 17 is formed between the bolt 16 and the bolt through hole 12b of the flange 12a. The oil pan 12 is elastically supported by the cylinder block 11 in the vertical direction and the horizontal direction 5.

In this state, even if the flange 12a tries to displace horizontally due to horizontal inertia force acting on the oil pan 12, the flange 12a is moved by the upper elastic body that is positioned horizontally in close contact with the outer periphery of the bolt 16. 13, it is slightly displaced only by the elastic deformation of the upper elastic body 13, but there is no relative deviation between the upper elastic body 13 and the gap 17 due to the elastic deformation of the upper elastic body 13. If it is set to a value greater than the amount, there will be no interference between the bolt 16 and the bolt through hole 12b.

As is clear from the above, this idea is to adhesively fix the upper elastic body to the flange of the oil pan by aligning the axis of the bolt through hole of the upper elastic body with the axis of the bolt through hole of the flange. The bolt through holes in the elastic body are brought into close contact with the bolts, and an annular gap is formed between the bolt through holes in the flange and the bolts, making assembly of the oil pan extremely easy. There is no relative displacement between the flange and the elastic body due to horizontal vibration of the cylinder block or horizontal inertia acting on the oil pan, and there is always a gap between the bolt through hole of the flange and the bolt. An annular gap can be maintained, the oil pan can be reliably insulated from vibration in the vertical and horizontal directions with respect to the cylinder block, and engine noise can be reduced as much as possible.

Moreover, in this invention, since the lower surface of the upper elastic body is adhesively fixed to the lower surface of the oil pan, the sealing performance between the flange and the upper elastic body can also be improved.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional view showing a conventional elastic support device for an engine oil pan, Fig. 2 is a partial cross-sectional view showing an embodiment of this invention, and Fig. 3 is a cross-sectional view taken along line A-A in Fig. 2. It is a diagram. 11... Cylinder block, 12...
Oil pan, 12a...Flange, 12b...
... Bolt through hole, 13 ... Upper elastic body,
14... Lower elastic body, 16... Bolt, 17... Annular gap.

Claims (1)

[Scope of utility model registration request] An engine in which the flange of the oil pan is sandwiched between the lower surface of an annular upper elastic body having a plurality of through holes in the circumferential direction and the upper surface of the lower elastic body, and is elastically supported on the cylinder block by bolts passing through these. In an oil pan elastic support device, the lower surface of the upper elastic body is adhesively fixed to the flange of the oil pan with the axis of the bolt through hole of the upper elastic body aligned with the axis of the through hole of the flange. An elastic support device for an engine oil pan, characterized in that the bolt through hole of the elastic body is brought into close contact with the bolt, and an annular gap is formed between the bolt through hole of the flange and the bolt.