CN214465453U - Engine main bearing cap connecting structure and main bearing bolt thereof - Google Patents
Engine main bearing cap connecting structure and main bearing bolt thereof Download PDFInfo
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- CN214465453U CN214465453U CN202022921034.8U CN202022921034U CN214465453U CN 214465453 U CN214465453 U CN 214465453U CN 202022921034 U CN202022921034 U CN 202022921034U CN 214465453 U CN214465453 U CN 214465453U
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Abstract
The utility model discloses an engine main bearing cap connection structure and base bearing bolt thereof, base bearing bolt include pole portion and screw thread portion, and the lower tip of screw thread portion is connected with pole portion. The upper end of the thread part is provided with a conical part and an arc part, and the arc part is used for connecting the conical part and the thread part. The conical part and the circular arc part are both in a thread structure. Compared with any two cross-sectional circular surfaces of the circular arc part, the cross-sectional circular radius close to the rod part is larger than that close to the conical part. The threaded connection area of the main bearing bolt and the engine body of the engine adopts a structure with a small cone and a large circular arc transition, so that the safety coefficient of connection between the main bearing bolt and the engine body can be improved, and the working reliability of the engine is improved.
Description
Technical Field
The utility model relates to the technical field of engines, especially, relate to an engine main bearing cap connection structure and main bearing bolt thereof.
Background
The main bearing cap of the engine is secured to the engine block using main bearing bolts. The main bearing bolt bears the alternating load of the diesel engine, and the working condition is severe. The connection position of the main bearing bolt and the machine body threaded hole is easy to generate stress concentration. Along with the continuous improvement of the strengthening degree of the diesel engine, the stress on the part where the main bearing bolt is connected with the engine body is more dangerous, and the working reliability of the engine is seriously influenced.
When the diesel engine high-cycle fatigue is subjected to simulation analysis, the stress condition of the uppermost thread connected by the main bearing bolt and the body thread of the diesel engine is the worst, the safety coefficient is the minimum, and the failure risk is the highest. The stress of the circular angular contact position of the machine body and the main bearing cap is concentrated, and fatigue failure is easy to generate.
The distance from the center of the side pull bolt to the center of the crankshaft is large, the bending moment generated by the motion of the crankshaft is large, and the main bearing cover is easy to position inaccurately.
The bearing temperature sensor hole on the main bearing cap is a through hole, and the crankcase oil mist easily reaches the bottom of the lower bearing bush through the through hole, so that the lower bearing bush is corroded and slides.
Disclosure of Invention
In order to overcome the defects, the utility model provides a first technical problem who solves provides a main bearing bolt, can improve the factor of safety that main bearing bolt and organism are connected, improves the reliability of engine work.
In order to solve the technical problem, the main bearing bolt of the present invention comprises a rod portion and a threaded portion, wherein a lower end portion of the threaded portion is connected to the rod portion; the upper end part of the thread part is provided with a conical part and an arc part, and the arc part is used for connecting the conical part and the thread part; the conical part and the circular arc part are both in threaded structures; compared with any two cross sections of the circular arc part, the radius of the cross section circle close to the rod part is larger than that of the cross section circle close to the conical part.
Further, the main bearing bolt further comprises a positioning portion, and the positioning portion is connected with the upper end portion of the conical portion.
Further, compared with any two cross-sectional circular surfaces of the conical part, the cross-sectional circular radius close to the arc part is larger than the cross-sectional circular radius close to the positioning part.
Furthermore, the diameter of the threaded part is d, and the radius of the circular arc part is 2d-3 d.
Further, the vertical height h of the arc part is 0.25d-0.5 d.
Furthermore, the rod part is made of chromium molybdenum alloy steel.
Based on a general inventive concept, the second technical problem to be solved by the present invention is to provide a connection structure of a main bearing cap of an engine, which can improve the safety factor of the connection of a main bearing bolt and an engine body and improve the reliability of the operation of the engine.
The engine main bearing cap connecting structure comprises a main bearing cap and an engine body, wherein the main bearing cap is fixedly connected with the engine body through the main bearing bolt.
Furthermore, a temperature sensor mounting hole is formed in the main bearing cover and is a blind hole with an opening at the lower end.
Furthermore, the engine main bearing cap connecting structure further comprises two side stay bolts for fixedly connecting the main bearing cap with the engine body, the two side stay bolts are a first side stay bolt and a second side stay bolt respectively, and the first side stay bolt and the second side stay bolt are transversely arranged.
Furthermore, the distance H between the first side pull bolt and the second side pull bolt and the central line of the crankshaft is 80 mm.
After the technical scheme is adopted, the beneficial effects of the utility model are that, the base bearing bolt includes pole portion and screw thread portion, and the lower tip of screw thread portion is connected with pole portion. The upper end of the thread part is provided with a conical part and an arc part, and the arc part is used for connecting the conical part and the thread part. The conical part and the circular arc part are both in a thread structure. Compared with any two cross-sectional circular surfaces of the circular arc part, the cross-sectional circular radius close to the rod part is larger than that close to the conical part. The threaded connection area of the main bearing bolt and the engine body of the engine adopts a structure with a small cone and a large circular arc transition, so that the safety coefficient of connection between the main bearing bolt and the engine body can be improved, and the working reliability of the engine is improved.
A temperature sensor mounting hole is formed in the main bearing cover, a temperature sensor used for detecting the temperature of the bearing bush is mounted in the temperature sensor mounting hole, and the temperature sensor mounting hole is a blind hole with an opening at the lower end. The temperature sensor mounting hole adopts the structure of blind hole can enough measure the temperature of axle bush, can prevent the oil mist in the crankcase again to get into the bottom surface of lower axle bush, prevents the slip of lower axle bush, corruption.
The engine main bearing cap connecting structure further comprises two side pull bolts for fixedly connecting the main bearing cap with the engine body, the two side pull bolts are a first side pull bolt and a second side pull bolt respectively, and the first side pull bolt and the second side pull bolt are transversely arranged. And the distance H between the first side pull bolt and the second side pull bolt and the central line of the crankshaft is 80 mm. The position of the side pull bolt is close to the central line of the crankshaft, the bending moment generated by the motion of the crankshaft is small, the main bearing cap is accurately positioned, the deformation of the main bearing cap is small, and the friction force of the joint surface of the main bearing cap and the engine body is increased.
Drawings
FIG. 1 is a schematic structural view of an engine main bearing cap connection structure and a main bearing bolt thereof according to the present invention;
FIG. 2 is an enlarged schematic view of region A of FIG. 1;
FIG. 3 is an enlarged schematic view of region B of FIG. 1;
FIG. 4 is an enlarged schematic view of region C of FIG. 1;
FIG. 5 is a schematic structural view of the main bearing bolt of the present invention;
FIG. 6 is an enlarged schematic view of region D of FIG. 5;
FIG. 7 is an enlarged schematic view of region E of FIG. 6;
in the figure: 1-main bearing bolt, 11-rod part, 12-thread part, 13-arc part, 14-conical part, 15-positioning part, 2-machine body, 21-first groove, 22-second groove, 3-main bearing cover, 31-temperature sensor mounting hole, 41-first side pull bolt and 42-second side pull bolt.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
Referring to fig. 1, 2, 3 and 4, a main bearing cap connection structure for an engine includes a main bearing cap 3 and a machine body 2, wherein the main bearing cap 3 is fixedly connected with the machine body 2 through two main bearing bolts 1.
The engine main bearing cap connecting structure further comprises two side pull bolts for fixedly connecting the main bearing cap 3 with the engine body 2, the two side pull bolts are a first side pull bolt 41 and a second side pull bolt 42 respectively, and the first side pull bolt 41 and the second side pull bolt 42 are transversely arranged. The distance H between the first side pull bolt 41 and the second side pull bolt 42 and the central line of the crankshaft is preferably 80 mm. The first side stay bolt 41 and the second side stay bolt 42 are arranged close to the central line of the crankshaft, the bending moment generated by the motion of the crankshaft is small, the main bearing cap 3 is accurately positioned, the deformation of the main bearing cap 3 is small, and the friction force of the joint surface of the main bearing cap 3 and the machine body 2 is increased.
A temperature sensor mounting hole 31 is provided on the main bearing cap 3, the temperature sensor mounting hole 31 is a blind hole with an opening at the lower end, and the temperature sensor mounting hole 31 is vertically arranged. The distance of the upper end of the blind hole from the inner wall surface of the main bearing cap 3 is preferably 5 mm. A temperature sensor (not shown) for detecting the temperature of the bush is mounted in the temperature sensor mounting hole 31. The temperature sensor mounting hole 31 is a blind hole structure, which can measure the temperature of the bearing bush and prevent the oil mist in the crankcase (not shown in the figure) from reaching the bottom surface of the lower bearing bush (not shown in the figure) to prevent the lower bearing bush from sliding and corroding.
And two grooves, namely a groove I21 and a groove II 22 are arranged on the machine body 2 at the joint of the fillets positioned at the outer edges of the two sides of the main bearing cover 3 and the machine body 2. The groove bottom of the first groove 21 is preferably an arc-shaped groove bottom; the groove bottom of the second groove 22 is preferably a circular arc-shaped groove bottom. The reliability of the engine operation is improved.
As shown in fig. 1, 5, 6, and 7, the main bearing bolt 1 includes a shank 11 and a threaded portion 12, a lower end portion of the threaded portion 12 is connected to the shank 11, and the shank 11 is preferably made of chrome molybdenum alloy steel. The upper end of the threaded portion 12 is provided with a conical portion 14 and an arc portion 13, and the arc portion 13 connects the conical portion 14 and the threaded portion 12. The conical portion 14 and the circular arc portion 13 are both of a thread structure. The main bearing bolt 1 further comprises a positioning portion 15, the positioning portion 15 being connected with the upper end of the conical portion 14. The screw thread connection area of the main bearing bolt 1 and the engine body 2 adopts a structure of a small cone and a large circular arc transition, the thickness of the engine body 2 of the screw thread connection part of the main bearing bolt 1 and the engine body 2 is increased, the safety factor of the connection of the main bearing bolt 1 and the engine body 2 can be improved, and the reliability of the work of the engine is improved.
In any two cross-sectional circular surfaces of the circular arc portion 13, the cross-sectional circular radius near the rod portion 11 is larger than the cross-sectional circular radius near the conical portion 14. The difference between the radius of the cross section of the lower end face and the radius of the cross section of the upper end face of the circular arc part 13 is 0.8-1.5 mm.
In any two cross-sectional circular surfaces of the conical portion 14, the cross-sectional circular radius near the circular arc portion 13 is larger than the cross-sectional circular radius near the positioning portion 15.
The diameter of the threaded portion 12 is d, and the radius of the circular arc portion 13 is preferably 2d-3 d.
The vertical height h of the circular arc portion 13 is preferably 0.25d to 0.5 d.
The technical features (such as the first side pull bolt, the second side pull bolt, the first groove, the second groove, etc.) with the names of serial numbers referred to in the present specification are only for distinguishing the technical features, and do not represent the position relationship, the installation sequence, the working sequence, etc. among the technical features.
In the description of the present specification, it is to be understood that the orientations or positional relationships described in the "upper end portion", "lower end portion", "vertical", "lower bush", "vertical arrangement", "lateral arrangement", "upper end surface", "lower end surface", "inner wall surface", and the like are based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
The present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes without creative work from the above conception, which falls within the protection scope of the present invention.
Claims (10)
1. A main bearing bolt comprising a shank portion and a threaded portion, wherein a lower end of the threaded portion is connected to the shank portion; the upper end part of the thread part is provided with a conical part and an arc part, and the arc part is used for connecting the conical part and the thread part; the conical part and the circular arc part are both in threaded structures; compared with any two cross sections of the circular arc part, the radius of the cross section circle close to the rod part is larger than that of the cross section circle close to the conical part.
2. The main bearing bolt of claim 1 further comprising a locating portion connected to an upper end of the conical portion.
3. The main bearing bolt of claim 2 wherein a cross-sectional radius of any two cross-sectional circular surfaces of the conical portion adjacent the circular arc portion is greater than a cross-sectional radius of any two cross-sectional circular surfaces adjacent the locating portion.
4. The main bearing bolt of claim 1 wherein the diameter of the threaded portion is d and the radius of the radiused portion is 2d-3 d.
5. The main bearing bolt of claim 1 wherein the vertical height h of the arc portion is in the range of 0.25d to 0.5 d.
6. Main bearing bolt according to claim 1, wherein the shank is of chrome molybdenum alloy steel.
7. An engine main bearing cap connection comprising a main bearing cap and a block, the main bearing cap being fixedly connected to the block by a main bearing bolt according to any one of claims 1 to 6.
8. The main bearing cap connection structure of an engine according to claim 7, wherein a temperature sensor mounting hole is provided in the main bearing cap, and the temperature sensor mounting hole is a blind hole opened at a lower end.
9. The main bearing cap connection structure of an engine according to claim 8, further comprising two side stay bolts for fixedly connecting the main bearing cap with the engine body, wherein the two side stay bolts are a first side stay bolt and a second side stay bolt, and the first side stay bolt is arranged transversely to the second side stay bolt.
10. The main bearing cap connection structure of an engine according to claim 9, wherein a distance H between the first and second side stay bolts and a centerline of the crankshaft is 80 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022921034.8U CN214465453U (en) | 2020-12-08 | 2020-12-08 | Engine main bearing cap connecting structure and main bearing bolt thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022921034.8U CN214465453U (en) | 2020-12-08 | 2020-12-08 | Engine main bearing cap connecting structure and main bearing bolt thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214465453U true CN214465453U (en) | 2021-10-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022921034.8U Active CN214465453U (en) | 2020-12-08 | 2020-12-08 | Engine main bearing cap connecting structure and main bearing bolt thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214465453U (en) |
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2020
- 2020-12-08 CN CN202022921034.8U patent/CN214465453U/en active Active
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