CN217056258U - Chain case structure - Google Patents
Chain case structure Download PDFInfo
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- CN217056258U CN217056258U CN202220638285.1U CN202220638285U CN217056258U CN 217056258 U CN217056258 U CN 217056258U CN 202220638285 U CN202220638285 U CN 202220638285U CN 217056258 U CN217056258 U CN 217056258U
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- chain case
- case structure
- step portion
- reinforcing rib
- height
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Abstract
The utility model provides a chain case structure need not to set up solitary acoustic material, can restrain the radiated sound. The chain case structure has an outer surface and an inner surface, and a first step portion, a second step portion, and a reinforcing rib connecting the first step portion and the second step portion are provided on the inner surface, the first step portion is a boss portion for mounting, and a height difference is provided between the first step portion and the second step portion. The reinforcing rib forms a connecting portion extending in an inclined manner on the first stepped portion and the second stepped portion.
Description
Technical Field
The utility model relates to a chain case structure.
Background
In recent years, research and development have been conducted to contribute to the efficiency of energy in order to ensure reliable, sustainable, and advanced access to energy that is affordable to more people. In order to achieve the above object, research and development are being made to further improve the weight reduction and NV (Noise Vibration) performance of internal combustion engines.
Conventionally, as a method for improving NV (Noise Vibration) performance of an internal combustion engine, a structure in which a sound insulating cover is attached to a timing chain case (timing chain case) disposed on a side surface of the internal combustion engine is known (for example, see patent document 1). The noise insulation cover mounting structure sandwiches a sound absorbing material between the timing chain case and the noise insulation cover above the crankshaft pulley, and fixes the noise insulation cover to the timing chain case by two fastening portions. However, the noise insulation material of the noise insulation cover is expensive, and since the noise insulation cover is an additional independent member, additional manufacturing time is required, thereby increasing the production cost.
[ Prior art documents ]
[ patent document ]
[ patent document 1] Japanese patent laid-open No. 2020-125747
[ patent document 2] Japanese patent laid-open No. 2017-
[ patent document 3] Japanese patent laid-open publication No. 2013-113166
SUMMERY OF THE UTILITY MODEL
The utility model provides a chain case structure need not to set up solitary acoustic material, can restrain the radiated sound.
The utility model provides a chain case structure. The chain case structure has an outer surface and an inner surface, and a first step portion, a second step portion, and a reinforcing rib connecting the first step portion and the second step portion are provided on the inner surface, the first step portion is a boss portion for mounting, and a height difference is provided between the first step portion and the second step portion. The reinforcing rib forms a connecting portion extending in an inclined manner on the first stepped portion and the second stepped portion.
In an embodiment of the invention, the height of the connecting portion is closer to the inner surface as the connecting portion is farther from the first stepped portion, and the connecting portion is further extended at a predetermined height after being lowered to the predetermined height.
Based on the above, the utility model discloses an among the chain case structure, form through the mode that extends connecting portion with the slope, can reduce a part of stiffening rib to make the height of connecting at the stiffening rib of first step portion and second step portion can reduce, and then can restrain the frequency width of the resonance frequency of chain case structure, and can realize the acoustic pressure degree equivalent with the chain case structure that has the sound-proof housing. Thus, the chain case structure can suppress radiated sound without providing a separate sound insulating material.
In order to make the aforementioned and other features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1A is a schematic front view of an outer surface of a chain case structure according to an embodiment of the present invention;
FIG. 1B is a schematic front view of the inner surface of the chain case structure of FIG. 1A;
FIG. 1C is an enlarged partial schematic view of FIG. 1B;
FIG. 2 is a schematic front view of an outer surface of a chain case structure of a comparative example;
fig. 3 is a diagram showing a relationship between resonance frequency and sound pressure of the chain case of the embodiment of fig. 1A and the comparative example of fig. 2.
Description of reference numerals:
10: an internal combustion engine;
20: a crankshaft;
30: a rotating body;
100: a chain case structure;
110: a first step portion;
120: a second step portion;
130: reinforcing ribs;
131: a connecting portion;
e1, E2: an end portion;
h: a height difference;
HL: mounting holes;
s1: an outer surface;
s2: an inner surface;
SC: an inner surface.
Detailed Description
Fig. 1A is a schematic front view of an outer surface of a chain case structure according to an embodiment of the present invention; FIG. 1B is a schematic front view of the inner surface of the chain case structure of FIG. 1A; fig. 1C is a partially enlarged schematic view of fig. 1B.
Referring to fig. 1A to 1C, in the present embodiment, the chain case structure 100 is a timing chain case (chain case or chain case) disposed on a side surface of the internal combustion engine 10. Specifically, the chain case structure 100 is disposed so as to cover a cylinder block (not shown) in which 4 cylinder bores are arranged in a lateral direction and a side surface of a crank housing (not shown) which is formed integrally with the cylinder block below the cylinder block and forms a crank chamber. A crankshaft 20 extending in the direction of the cylinder row is provided in the crankshaft housing. A timing chain mechanism (not shown) for transmitting the rotation of the crankshaft 20 to the valve drive mechanism via a power transmission mechanism such as a timing chain, a timing belt, or a timing gear is provided inside the chain case structure 100. The crankshaft 20 extending from the crankshaft case side and penetrating the chain case structure 100 is connected to a rotating body 30 (crank pulley) disposed outside the chain case structure 100. The auxiliary machine is driven by a crankshaft pulley (not shown) as the rotary body 30 via a pulley (not shown) wound around the crankshaft pulley.
Specifically, as shown in fig. 1B and 1C, in the present embodiment, the chain case structure 100 has an outer surface S1 and an inner surface S2, and the inner surface S2 is provided with a first step portion 110, a second step portion 120, and a reinforcing rib 130 connecting the first step portion 110 and the second step portion 120. For example, the first step portion 110 is a boss portion for mounting the chain case structure 100, the first step portion 110 is formed with a mounting hole HL for mounting, and a height difference H is provided between the first step portion 110 and the second step portion 120. Reinforcing rib 130 extends in the cylinder axial direction, and the lower end thereof is located on the cylinder axis of crankshaft 20.
Further, as shown in fig. 1C, in the present embodiment, the reinforcing rib 130 forms a connection portion 131 extending in an inclined manner on the first step portion 110 and the second step portion 120. In the present embodiment, the connecting portion 131 of the reinforcing rib 130 has a height that is closer to the inner surface S2 as it becomes farther from the first stepped portion 110, and continues to extend at a predetermined height after being lowered to the predetermined height. That is, as shown in fig. 1C, one end E1 of the reinforcing rib 130 where the connecting portion 131 is provided is continuous with the first stepped portion 110, and the other end E2 of the reinforcing rib 130 is a rib located near (directly above) the crankshaft 20 and extending in the cylinder axis direction. By lowering the connecting portion 131 of the reinforcing rib 130 to the predetermined height and then continuing to extend the connecting portion to the crankshaft 20 at the predetermined height, the other end E2 of the reinforcing rib 130 and the timing chain mechanism can be prevented from interfering with each other.
In this manner, in the present embodiment, by the arrangement of the reinforcing rib 130 at the inner surface S2 of the chain case structure 100, the oil guide passage in the chain case structure 100 can be formed, and a large amount of lubricating oil for lubricating the timing chain, which is scattered in the chain case structure 100, can flow from the first stepped portion 110 to the second stepped portion 120 along the reinforcing rib 130 and be guided downward when the internal combustion engine is driven. By the arrangement in which the connecting portions 131 of the reinforcing ribs 130 extend in an inclined manner, the lubricating oil can flow in the chain case structure 100 more reliably.
Further, by designing the slope of the connection portion 131, it is possible to reduce a part of the reinforcing rib 130 while securing the rigidity of the reinforcing rib 130 connecting the first stepped portion 110 and the second stepped portion 120. For example, in the present embodiment, in the case that the height difference H between the first stepped portion 110 and the second stepped portion 120 is 33 mm, the maximum height of the reinforcing rib 130 may be set to about 10 mm. Thus, the height of the reinforcing rib 130 connecting the first step portion 110 and the second step portion 120 can be reduced, and the bandwidth of the resonance frequency of the chain case structure 100 can be suppressed, and the sound pressure level equivalent to that of the chain case structure 100 with the soundproof cover can be realized. Thus, the chain case structure 100 can suppress the radiated sound without providing a separate sound insulating material.
For example, fig. 2 is a schematic front view of an outer surface of a chain case structure of a comparative example, fig. 3 is a diagram showing a relationship between a resonance frequency and a sound pressure of the chain cases of the embodiment of fig. 1A and the comparative example of fig. 2, and fig. 2 shows that the chain case structure 100 ' of the comparative example is similar to the chain case structure 100, but the chain case structure 100 ' is different in that a noise insulation cover SC is provided, and a reinforcing rib of the chain case structure 100 extends at a fixed height as in the conventional art, and as shown in fig. 3, the chain case structure 100 can achieve the same resonance frequency and sound pressure level as the chain case structure 100 ' of the comparative example without providing the noise insulation cover SC.
To sum up, in the chain case structure of the present invention, the connecting portion is formed to extend obliquely, so that a part of the reinforcing rib can be reduced, the height of the reinforcing rib connected to the first step portion and the second step portion can be reduced, the frequency width of the resonance frequency of the chain case structure can be suppressed, and the sound pressure level equivalent to that of the chain case structure with the soundproof cover can be realized. Thus, the chain case structure can suppress radiated sound without providing a separate sound insulating material.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the embodiments of the present invention, and the essence of the corresponding technical solutions is not disclosed.
Claims (2)
1. A chain case structure having an outer surface and an inner surface, the inner surface being provided with a first step portion, a second step portion, and a reinforcing rib connecting the first step portion and the second step portion, the first step portion being a boss portion for mounting, a height difference being provided between the first step portion and the second step portion, the chain case structure being characterized in that,
the reinforcing rib forms a connecting portion extending in an inclined manner on the first stepped portion and the second stepped portion.
2. The chain case structure according to claim 1,
the height of the connecting portion is closer to the inner surface as the connecting portion becomes farther from the first stepped portion, and extends at a predetermined height after decreasing to the predetermined height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220638285.1U CN217056258U (en) | 2022-03-23 | 2022-03-23 | Chain case structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220638285.1U CN217056258U (en) | 2022-03-23 | 2022-03-23 | Chain case structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217056258U true CN217056258U (en) | 2022-07-26 |
Family
ID=82490223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220638285.1U Active CN217056258U (en) | 2022-03-23 | 2022-03-23 | Chain case structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217056258U (en) |
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2022
- 2022-03-23 CN CN202220638285.1U patent/CN217056258U/en active Active
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| GR01 | Patent grant |