JPS6027821B2 - Oil pan mounting structure - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement in an oil pan mounting structure.

The secondary oil pan mounting structure was as shown in FIGS. 1 and 2.

That is, the lower flange 2 of the engine cylinder block 1
A spacer 4 and a support 5 are vertically fixed to the holder 4 from below with bolts 3. A stepped portion 6 is formed inside the support 5, a gasket 7 is held in a groove formed between the stepped portion 6 and the baser 4, and a flange of an oil pan 8 is inserted between the gasket 7 and the groove. 9 is float-supported. The support 5 supports the gasket 7, and the height of the stepped portion 6 makes the compressibility of the gasket constant over the entire circumference. I can't make it bigger because of this.

Therefore, the width of the gasket 7 must be increased by making the inner ends of the base plate 4 and the support 5 protrude further inward than the inner ends of the flange 2 of the cylinder block.
The width of the oil pan 8 becomes smaller at the part that protrudes inward, and the capacity of the oil pan becomes smaller.Furthermore, the contact area between the gasket 7 and the flange 9 of the oil pan 8 becomes smaller, which reduces the risk of impact from flying stones or running over the oil pan. As a result, there was an inconvenience that the flange 9 could come out of the gasket 7 and oil leakage would occur.This invention was made to solve the above-mentioned inconveniences, and it is possible to increase the width of the oil pan. It is also an object of the present invention to provide an oil pan mounting structure that prevents the oil pan from coming off from the gasket and preventing oil leakage.

In order to achieve such an object, the present invention provides a structure in which the flange of the oil pan is float-supported through a gasket that is held between a bolt and a support tightened by the bolt from below on the lower flange of the engine cylinder block. In the oil pan mounting structure, the bolt is provided with a tightening amount regulating mechanism coaxial with the bolt, the gasket is extended to the outside of the bolt, and the flange of the oil pan is configured to adjust the tightening amount of the bolt. A notch is formed inward from the outer peripheral end so as not to interfere with the regulating mechanism, and the outer peripheral end extends to near the outer peripheral end of the gasket, and the notch at the outer peripheral end is formed. The support is bent upward at its outer end, and the portion corresponding to the engagement hole protrudes further upward. The projecting end portion is configured to engage with the engagement hole at the projecting tip of the flange.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 is a sectional view similar to FIG. 2 showing an embodiment of the oil pan mounting structure according to the present invention, FIG. 4 is a sectional view taken along line W-N in FIG. 3, and FIG. 5 is the same embodiment. FIG. 6 is a plan view showing a part of the oil pan in the same embodiment, and FIG. 6 is a plan view showing the structure of the gasket in the same embodiment.

As shown in FIG. 3, in this embodiment the bolt 3
The amount of the bolt is regulated by a cylindrical collar 10 that is iron-coated coaxially with this bolt.

A collar flange 12 that contacts the head 11 of the bolt 3 is provided at the lower end of the collar 1. Further, in this embodiment, the support 5 is formed by bending a thin plate-like material, and the gasket 7 is sandwiched between the support 5 and the flange 2 of the silling block, and the bolt 3 is fitted with iron. The head 111 of the bolt 3 is attached through the collar flange 2 of the collar 10. In this embodiment, as shown in FIG. 5, the flange 9 of the oil pan 6 has a notch 13 formed inwardly from the outer peripheral end at a portion corresponding to the bolt 3 and the collar 10'.

This notch 13 has a width through which the collar 10 can pass and a semicircular arc shape corresponding to its outer diameter. The depth of the notch 3 from the outer peripheral end is such that the tip of the flange 9 reaches near the tip of the flange 2 of the shilling block, as shown in FIGS. 3 and 4. In addition, in this embodiment, as shown in FIG.
The part of the flange 9 in which the notch 13 is not formed is made to protrude further outward from the outer peripheral end of the flange 2 of the cylinder block, and an engagement hole 25 is formed in which the protruding end 24 at the outer peripheral end of the support 5 engages. It was formed (
(See Figure 9).

The engagement hole 25 is provided in a portion where the cutout portion 13 is not formed, and the protruding end portion 24 of the support 5 is provided in a large upward direction only in the portion where the engagement hole 25 is provided, as shown in FIG. It has been extended to According to this embodiment, the flange 9 of the oil pan is reliably engaged with the protruding end portion 24 of the support through the engagement hole 25, so that it is further prevented from coming off. The shape of the gasket 7 is as shown in detail in FIGS. 6 to 8.
A groove 14 for holding the flange 9 of the oil pan is formed at an intermediate position in the height direction.

The planar shape of this groove 14 is formed into a female shape with respect to the flange 9 of the oil pan, as shown in FIGS. 4 and 6, so that the portion where the groove 14 is not formed is a notch. 13, a notch corresponding portion 15 and an outer peripheral twill portion 16 are formed. A through hole 17 through which the collar 10 can pass is formed at the center of this notch corresponding portion 15. Further, as shown in FIG. 7, a groove 18 is formed at the outer peripheral end of the groove 14 over the entire circumference in order to prevent cracks caused by interference or interference with the oil pan. Chamfered portions 19 are formed at the upper and lower ends of the through hole 17 of the gasket 7 to prevent jamming during competition, and ribs 20 are formed on the contact surface with the flange 9 and the contact surface with the flange 2 of the cylinder block. is formed, thereby increasing the surface pressure locally, thereby improving the sealing performance and reducing the surface pressure of the entire gasket, thereby making it possible to further reduce vibration and noise.

The support 5 is arranged along the lower surface of the flange 2 of the shilling block, and its outer peripheral end is bent upward, and its inner peripheral end is bent downward so as not to interfere with the oil pan 8.

Also, except for the part corresponding to the bolt 3 of the support 5, the third
As shown by the chain line 5A in the figure and the solid line 5A in FIG.
The rigidity has been strengthened. In the above embodiment, the gasket 7
Since the width of the flange 2 can be made the same as the width of the flange 2 of the cylinder block, the sealing area between the flange 2 and the gasket 7 and between the gasket 7 and the flange 9 of the oil pan is increased, improving sealing performance and eliminating the need for a spacer. Furthermore, since the flange 9 of the oil pan can be positioned on the outside, there is an advantage that the capacity of the oil pan can be increased. In the above embodiment, the amount of tightening of the bolt 3 is regulated by the collar 1, but this may be any mechanism that substantially regulates the amount of vertical attachment of the bolt, as shown in FIG. 11. Step bolt 3A
You can also use it as The stepped bolt 3A has a large portion 21 corresponding to the gasket 7 and the support 5. FIG. 12 is a sectional view of the same embodiment at a location other than the bolt penetration portion. Further, in the first embodiment, the notch 13 formed in the flange 9 of the oil pan 8 has a planar shape similar to a part of an ellipse;
As shown in Fig. 3, the bolt 3 or stepped bolt 3A is opposed with a width b narrower than the outer diameter a of the bolt 3 or stepped bolt 3A between the tightening amount regulating mechanism accommodating portion 22 corresponding to the collar or the thick shaft portion and the outer peripheral end. Alternatively, a narrow portion 23 may be formed.

In this case, when inserting the gasket tightening amount regulating mechanism accommodating portion 22 into the oil pan flange 9, the through hole 17 is hollow, so the support 5 is inserted after being elastically deformed.
If bolt 3 is installed through step bolt 3A,
After narrowing, the narrow portion 23 serves to prevent the flange 9 from coming off. Therefore, as shown in FIG. 14, the lateral grooves of the gasket 7 also correspond to the shape shown in FIG. 1.

FIG. 15 and FIG. 16 are sectional views showing a modification of the first embodiment.

These modified examples include the protruding end 24 of the support 5 and the connecting hole 2.
5 are both made of metal, and are designed to prevent them from colliding with each other and generating noise due to vibrations during engine operation. In the case of FIG. FIG. 16 shows an insulator 26 provided on the inner periphery of the engagement hole 25.

As described above, the present invention provides an oil pan installation in which the flange of the oil pan is float-supported through the gasket which is sandwiched between the bolt and the support attached to the lower flange of the engine cylinder block from below. In the structure, the bolt is provided with a tightening amount regulating mechanism coaxial with the bolt, the gasket is extended to the outside of the bolt, and the flange of the oil pan does not interfere with the bolt tightening amount regulating mechanism. A notch is formed inward from the outer peripheral edge as shown in FIG.
Since the outer circumferential end extends close to the outer circumference of the gasket, the gasket can be provided over the entire width of the lower flange of the cylinder block, and the flange of the oil pan can also be extended to approximately the same range as this gasket. , hence the cylinder tab.

The contact area between the gasket and the gasket and the gasket and the oil pan flange can be increased, thereby increasing the sealing effect and preventing the oil pan from falling off.Furthermore, the oil pan flange can be positioned outward. This has the excellent effect of increasing the capacity of the oil pan. In addition, the flange of the oil pan is provided with a notch, and by engaging the notch corresponding part of the gasket with this notch, the bolt holes can be positioned, improving the ease of assembly. play. In addition, since the flange of the oil pan is reliably engaged with the protruding end of the support through the engagement hole, there is an effect that the flange is reliably prevented from coming off.

[Brief explanation of the drawing]

Fig. 1 is a side view showing an engine to which a conventional oil pan mounting structure is applied, Fig. 2 is an enlarged sectional view taken along line D-U in Fig. 1, and Fig. 3 is an oil pan mounting structure according to the present invention. FIG. 4 is a sectional view taken along line N-W in FIG. 3; FIG. 5 is a plan view showing a part of the oil pan in the same embodiment; 6 is a plan view showing the shape of the gasket in the same example, FIGS. 7 and 8 are sectional views along the skin-to-skin line and W-wind line in FIG. 6, and FIG.
The figure is a sectional view of the same embodiment at a location other than the bolt penetration part, FIG. 10 is a view taken along the line XV-XV in FIG. 9, and FIGS. 11 and 12 show a second embodiment of the present invention. Cross section, 1st
3 is a plan view showing the appearance of the flange portion of an oil pan in a third embodiment of the present invention, FIG. 14 is a sectional view similar to FIG. 4 in the same embodiment, and FIGS. 15 and 16 are FIG. 7 is a cross-sectional view of a modified example of the first embodiment. 1...Engine cylinder block, 2...Flange, 3...
・Bolt, 3A...Stepped bolt, 5...Support,
7... Gasket, 8... Oil pan, 9... Flange, 10
... Collar, 11... Head, 13... Notch, 14.
...Groove, 21...Koji large part, 22...Vertical attachment amount regulating mechanism housing part, 23...Narrow part, 24...Protruding end part, 25
...Engagement hole. Figure I Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9! ○Figure River Figure l2 Figure l3 Figure 14 Figure I5 Figure I6

Claims (1)

[Claims] 1. An oil pan mounting structure in which an oil pan flange is float-supported from below on the lower flange of an engine cylinder block via a gasket held between a bolt and a support tightened by the bolt. , the bolt is provided with a tightening amount regulating mechanism coaxial therewith, the gasket is extended to the outside of the bolt, and the flange of the oil pan is configured not to interfere with the bolt tightening amount regulating mechanism. A notch is formed inward from the outer circumferential edge, and the outer circumferential edge is extended to the vicinity of the outer circumferential edge of the gasket, and the portion of the outer circumferential edge where the notch is not formed is the outer circumferential edge of the gasket. The protrusion is made to protrude further, and an engagement hole is formed at the tip of the protrusion.
The outer end of the support is bent upward, and a portion corresponding to the engagement hole is further provided to protrude upward, so that this protruding end portion engages with the engagement hole at the protruding tip of the flange. An oil pan mounting structure characterized by: 2. The oil pan mounting structure according to claim 1, wherein the tightening amount regulating mechanism is a collar coaxially fitted to the bolt between the bolt head and the lower flange of the cylinder block. 3. The oil pan according to claim 1, wherein the bolt is a stepped bolt, and the tightening amount regulating member is a thick shaft portion between the threaded portion of the bolt with the cylinder block and the head. Mounting structure. 4. The notch part of the oil pan flange has a narrow part with a gap smaller than the bolt outer diameter between the outer end of the flange and the accommodating part of the tightening amount regulating member. Oil pan mounting structure in Section 3.