CN210889120U - Screwing structure of shell nut - Google Patents
Screwing structure of shell nut Download PDFInfo
- Publication number
- CN210889120U CN210889120U CN201921702272.0U CN201921702272U CN210889120U CN 210889120 U CN210889120 U CN 210889120U CN 201921702272 U CN201921702272 U CN 201921702272U CN 210889120 U CN210889120 U CN 210889120U
- Authority
- CN
- China
- Prior art keywords
- screw
- screw insertion
- cover
- bottom cover
- maintenance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000003780 insertion Methods 0.000 claims abstract description 70
- 230000037431 insertion Effects 0.000 claims abstract description 70
- 238000012423 maintenance Methods 0.000 claims abstract description 59
- 238000004891 communication Methods 0.000 claims description 15
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 239000010705 motor oil Substances 0.000 description 2
- 238000004904 shortening Methods 0.000 description 1
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- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The utility model provides a structure is closed in spiral shell of casing nut. The structure includes a case nut and a screw, the case nut includes a clamping portion for clamping an opening edge portion of a maintenance port in an engine bottom cover, and a cylindrical screw insertion portion extending in a direction perpendicular to the clamping portion from a periphery of a through hole formed in the clamping portion, the screw passes through a screw insertion hole in a maintenance port cover of the maintenance port, a screw insertion hole in the engine bottom cover, and a through hole in the clamping portion and is screwed to the screw insertion portion, the maintenance port cover is fastened and connected to the engine bottom cover, the screw insertion portion includes a screw portion for screwing the screw, and an extension portion extending from a front end of the screw portion, and a tip of the screw is positioned inside the extension portion in a state where the maintenance port cover is fastened and connected to the engine bottom cover by the screw and the case nut. Based on the above structure, it is possible to prevent other components from being damaged by the tip of the screw when the tip touches the screw.
Description
Technical Field
The utility model relates to a spiral shell of casing nut closes structure for inciting somebody to action maintenance flap is installed on engine bottom.
Background
In the related art, an engine bottom cover is provided on a lower side of an engine room of an automobile, and a maintenance opening is formed in the engine bottom cover. Normally, the maintenance port is covered with a maintenance port cover, and the maintenance port is opened only when maintenance work such as engine oil exchange is performed. Thus, the aerodynamic characteristics of the automobile during running can be improved.
Typically, mounting the service cover to the engine bedplate requires the use of housing nuts and bolts. Fig. 6 is a sectional view showing the mounting portion of the maintenance cover mounted with the case nut a and the screw d. As shown in fig. 6, screw insertion holes b1 and insertion holes c1 are formed in the opening edge b3 of the maintenance port b2 of the engine bottom cover b and the outer edge c2 of the maintenance port cover c, respectively. The case nut a has a clamping portion a1 for clamping the opening edge portion b3 of the engine bottom cover b from the upper and lower sides, and a cylindrical screw insertion portion a2 for inserting a screw d for fastening. The clip portion a1 has an upper disc a3 and a lower disc a 4. Through holes a5 and a6 are formed in the upper disc a3 and the lower disc a4, respectively. The center lines of the through hole a5 and the through hole a6 overlap the center line of the screw insertion portion a 2.
When the maintenance cover c is attached to the engine bottom cover b, the opening edge portion b3 of the engine bottom cover b is first sandwiched between the upper disc a3 and the lower disc a4 of the clamping portion a1, and in this state, the screw insertion hole b1, the insertion hole c1, the through hole a5, and the through hole a6 are aligned with each other, and the washer e is padded on the lower side of the maintenance cover c, and then the screw portion d1 of the screw d is inserted into the opening e1 of the washer e, the screw insertion hole c1 of the maintenance cover c, the through hole a6 of the lower disc a4, the screw insertion hole b1 of the engine bottom cover b, and the through hole a5 of the upper disc a3 in this order, and then screwed into the screw insertion portion a 2. Thus, the maintenance cover c can be attached to the engine bottom cover b by the case nut a and the screw d.
However, in a state where the maintenance flap c is mounted on the engine bottom cover b, the tip end portions (nail portions) of the screws d protrude outside (above) the screw insertion portions a2 of the case nut a. Since the tip of the screw d is sharp, in the case where the tip of the screw d touches other components, there is a possibility that the other components are damaged. For example, when an oil pan (not shown) of the engine touches the tip of the screw d during vertical vibration during traveling of the automobile, the oil pan may be damaged.
SUMMERY OF THE UTILITY MODEL
In view of the above circumstances, an object of the present invention is to provide a screwing structure of a housing nut capable of preventing a tip of a screw from damaging other members.
As a solution to the above-mentioned technical problem, the present invention provides a screwing structure of a case nut, including a case nut and a screw, the case nut including a holding portion for holding an opening edge portion of a maintenance port on an engine bottom cover and a tubular screw insertion portion extending in a direction perpendicular to the holding portion from a periphery of a through hole formed in the holding portion, the screw passing through a screw insertion hole formed in a maintenance port cover of the maintenance port, a screw insertion hole formed in the engine bottom cover, and the through hole in the holding portion and being screwed with the screw insertion portion, the maintenance port cover being fastened and connected to the engine bottom cover, the screwing structure comprising: the screw insertion portion includes a screw portion for screwing the screw and an extension portion extending from a distal end of the screw portion, and a tip end of the screw is positioned inside the extension portion in a state where the maintenance cover is fastened and connected to the engine bottom cover by the screw and the case nut.
The utility model discloses an above-mentioned casing nut closes spiral shell structure's advantage lies in, can prevent that the pointed end of screw from damaging other parts. Specifically, when the maintenance cover is attached to the engine bottom cover, the maintenance cover covering the maintenance opening is fastened to the engine bottom cover by inserting screws through the screw insertion holes and the through holes of the clamping portion while the opening edge portion of the maintenance opening is clamped by the clamping portion of the case nut and aligning the screw insertion holes formed in the maintenance cover and the screw insertion holes formed in the engine bottom cover with the through holes of the clamping portion.
In the above-described screwing structure of a housing nut according to the present invention, it is preferable that a communication hole that communicates at least the inside and the outside of the extension portion is formed in a side wall of the screw insertion portion. Since the extension portion is formed at the tip of the screw portion of the screw insertion portion, rainwater and the like may accumulate in the screw insertion portion to rust the screw. With the above configuration, since the communication hole for communicating at least the inside of the extension portion with the outside is formed in the side wall of the screw insertion portion, rainwater and the like flowing into the screw insertion portion can be discharged from the communication hole, and rust of the screw can be prevented.
In the above-described screwing structure of a housing nut according to the present invention, it is preferable that the screw insertion portion is configured such that a thickness dimension of the extension portion is smaller than a thickness dimension of the screw portion. With this structure, the communicating hole can be easily processed. In general, when forming the communication hole in the housing nut, it is necessary to cut a part of the side wall of the screw insertion portion to form a hole, and since the thickness of the region (extended portion) where the communication hole is formed is small, the time and cost required for the cutting can be reduced.
Drawings
Fig. 1 is a plan view showing a state in which a maintenance port cover is attached to an engine bottom cover by a case nut in an embodiment of the present invention.
Fig. 2 is a side view of the housing nut in the present embodiment.
Fig. 3 is a bottom view of the housing nut in the present embodiment.
Fig. 4 is a cross-sectional view of a section on the line IV-IV in fig. 1.
Fig. 5 is a sectional view of a section on the line V-V in fig. 1.
Fig. 6 is a cross-sectional view of a prior art cage nut corresponding to fig. 4.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Fig. 1 is a plan view showing a state in which the maintenance cover 3 of the present embodiment is attached to the engine bottom cover 2 by the case nut 1. In fig. 1, arrow FR indicates the vehicle body front side, and arrow LH indicates the vehicle body left side.
The engine head cover 2 is disposed below an engine room of the automobile. Bolt insertion holes 21 are formed at a plurality of locations on the outer periphery of the engine head cover 2. By inserting bolts, not shown, into these bolt insertion holes 21, the engine undercover 2 can be fastened to the vehicle body.
In addition, the engine head cover 2 is formed with a maintenance port 22. Normally, the maintenance port 22 is covered by the maintenance port cover 3, and only when maintenance work such as engine oil exchange is performed, the maintenance port cover 3 is removed to open the maintenance port 22, thereby providing an operation space necessary for the maintenance work.
Normally, the maintenance cover 3 is mounted on the engine bottom cover 2, and the case nut 1 is used. Fig. 2 is a side view of the housing nut 1, fig. 3 is a bottom view of the housing nut 1, fig. 4 is a sectional view of a section on the line IV-IV in fig. 1, and fig. 5 is a sectional view of a section on the line V-V in fig. 1.
As shown in fig. 4, a screw insertion hole 24 and a screw insertion hole 32 are formed in the opening edge portion 23 of the maintenance port 22 of the engine head cover 2 and the outer edge portion 31 of the maintenance port cover 3, respectively. In the present embodiment, screw insertion holes 24 are formed in four locations of the engine bottom cover 2; screw insertion holes 32 are formed in four portions of the maintenance cover 3. The maintenance port cover 3 can cover the maintenance port 22 by bringing the maintenance port cover 3 into contact with the bottom surface of the engine base cover 2 and aligning the screw insertion holes 24 with the screw insertion holes 32 (see fig. 1).
As shown in fig. 2 to 5, the case nut 1 includes a clamping portion 11 for clamping the opening edge portion 23 of the engine bottom cover 2 from the upper and lower sides, and a cylindrical screw insertion portion 12 for inserting the screw 4 for fastening.
The clamping portion 11 includes an upper disc 13 and a lower disc 14, and one ends of the upper disc 13 and the lower disc 14 are connected to each other by a bent connecting portion 15. The upper tray 13 and the lower tray 14 are formed with through holes 13a and 14a, respectively.
The screw insertion portion 12 extends from the periphery of the front end of the through hole 13a in the direction perpendicular to the clamping portion 11, and is formed integrally with the upper disc 13. The center line of the screw insertion portion 12 coincides with the center lines of the through hole 13a and the through hole 14 a. The inner diameter of the screw insertion portion 12 is substantially the same as the outer diameter of the screw portion 41 of the screw 4. In addition, other features of the screw insertion portion 12 will be described in detail later.
When the maintenance cover 3 is attached to the engine bottom cover 2, as shown in fig. 4 and 5, the opening edge portion 23 of the engine bottom cover 2 is sandwiched between the upper tray 13 and the lower tray 14 of the sandwiching portion 11. In this state, the screw insertion holes 24, the screw insertion holes 32, the through holes 13a, the through holes 14a are positionally aligned, and the washer 5 is padded on the lower side of the maintenance port cover 3, and then, the screw portions 41 of the screws 4 are inserted into the opening 51 of the washer 5, the screw insertion holes 32 of the maintenance port cover 3, the through holes 14a of the lower side disk 14, the screw insertion holes 24 of the engine bottom cover 2, the through holes 13a of the upper side disk 13 in this order from the lower side, and then screwed into the screw insertion portions 12. Thus, the maintenance cover 3 can be attached to the engine bottom cover 2 by the case nut 1 and the screws 4.
The main feature of the housing nut 1 of the present embodiment is that the screw insertion portion 12 has a threaded portion 12a and an extension portion 12b extending from the front end of the threaded portion 12a, and the upper end edge of the extension portion 12b is located above the tip of the screw 4 screwed into the screw insertion portion 12, that is, the tip of the screw 4 is located inside the extension portion 12 b. Specifically, the length of the screw insertion portion 12 (dimension t1 in fig. 4) is set to be greater than the sum of the length t2 of the screw portion 41 of the screw 4 minus the plate thickness t3 of the washer 5, the plate thickness t4 of the maintenance cover 3, the plate thickness t5 of the lower tray 14, the plate thickness t6 of the engine head cover 2, and the plate thickness t7 of the upper tray 13, that is,
t1＞t2－(t3+t4+t5+t6)。
in this way, in a state where the maintenance cover 3 is attached to the engine under cover 2, the tip end portions (nail portions) of the screws 4 are positioned inside the extension portions 12b of the screw insertion portions 12, and do not protrude above the screw insertion portions 12. Therefore, it is possible to prevent other components from being damaged by touching the tip of the screw 4, for example, an oil pan of an engine from being damaged by touching the tip of the screw 4 when vertical vibration occurs during traveling of an automobile.
The screws 4 in the present embodiment are screws for attaching the maintenance cover 3 to the engine bottom cover 2, and have a common size. In the present embodiment, the screw 4 is housed in the extension portion 12b by providing the extension portion 12b at the tip of the threaded portion 12a of the screw insertion portion 12, instead of shortening the length of the screw so that the end portion does not protrude above the upper end edge of the screw insertion portion 12. Therefore, the screwing amount between the screw 4 and the screw insertion portion 12 can be sufficiently secured, and a large removal load (load required to remove the screw 4 from the screw insertion portion 12) can be secured. As a result, the maintenance cover 3 can be firmly attached to the engine bottom cover 2, and the durability of the connection portion between the screw 4 and the maintenance cover 3, which are subjected to a large load, can be improved.
As shown in fig. 2 and 5, the housing nut 1 of the present embodiment is characterized in that a communication hole 16 that penetrates the screw insertion portion 12 in the horizontal direction is formed in a region from the upper portion of the threaded portion 12a to the lower portion of the extension portion 12b on the side wall of the screw insertion portion 12. The communication hole 16 is used to communicate the inside of the screw insertion portion 12 (particularly, the extension portion 12b) with the outside.
Since the communication hole 16 is formed, rainwater and the like that enter the screw insertion portion 12 can be discharged from the communication hole 16, and thus rust of the screw 4 can be prevented.
In addition, since a part of the communication hole 16 is located on the screw portion 12a, the contact area between the inner surface of the screw portion 12a and the outer surface of the shank portion 41 of the screw 4 can be adjusted, that is, the contact area can be reduced as compared with a structure in which the communication hole 16 is not formed, so that the fastening force required when screwing the screw 4 can be reduced. In other words, the difficulty of the fastening operation of the screw 4 can be reduced.
As shown in fig. 4, the screw insertion portion 12 is configured such that the thickness of the extension portion 12b is smaller than the thickness of the screw portion 12 a. Since the side wall of the screw insertion portion 12 needs to be cut to form an opening when the communication hole 16 is formed in the housing nut 1, and a part of the communication hole 16 is located in the extension portion 12b, reducing the thickness dimension of the extension portion 12b can shorten the time required for the cutting process.
Claims (3)
1. A screwing structure of a case nut including a case nut and a screw, the case nut including a clamping portion for clamping an opening edge portion of a maintenance port in an engine bottom cover, and a cylindrical screw insertion portion extending in a direction perpendicular to the clamping portion from a periphery of a through hole formed in the clamping portion, the screw being screwed with the screw insertion portion through a screw insertion hole formed in a maintenance port cover of the maintenance port, a screw insertion hole formed in the engine bottom cover, and the through hole in the clamping portion, and the maintenance port cover being fastened to the engine bottom cover, characterized in that:
the screw insertion portion includes a screw portion for screwing the screw and an extension portion extending from a distal end of the screw portion,
in a state where the maintenance cover is fastened to the engine bottom cover by the screw and the case nut, a tip of the screw is located inside the extension.
2. The screwing structure of a housing nut as defined in claim 1, wherein:
a communication hole is formed in a side wall of the screw insertion portion, and the communication hole communicates at least an inside and an outside of the extension portion.
3. The screwing structure of a housing nut as claimed in claim 1 or 2, wherein:
the screw insertion portion is configured such that a thickness dimension of the extension portion is smaller than a thickness dimension of the screw portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921702272.0U CN210889120U (en) | 2019-10-11 | 2019-10-11 | Screwing structure of shell nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921702272.0U CN210889120U (en) | 2019-10-11 | 2019-10-11 | Screwing structure of shell nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210889120U true CN210889120U (en) | 2020-06-30 |
Family
ID=71320418
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921702272.0U Expired - Fee Related CN210889120U (en) | 2019-10-11 | 2019-10-11 | Screwing structure of shell nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210889120U (en) |
-
2019
- 2019-10-11 CN CN201921702272.0U patent/CN210889120U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200630 |