CN213808447U

CN213808447U - Sectional type bent axle and marine engine

Info

Publication number: CN213808447U
Application number: CN202022836384.4U
Authority: CN
Inventors: 丁立志; 王雁冰; 赵雪琪
Original assignee: China Shipbuilding Power Engineering Institute Co Ltd
Current assignee: China Shipbuilding Power Engineering Institute Co Ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2021-07-27
Anticipated expiration: 2030-11-30

Abstract

The utility model relates to a marine engine field discloses a sectional type bent axle and marine engine, wherein, the sectional type bent axle, including at least two crank throws, and be located the main journal between two adjacent crank throws, the crank throw includes main part and first connecting portion, each crank throw face all is equipped with first connecting portion towards one side of main journal, main part and first connecting portion integrated into one piece; one end of the main journal is inserted into the corresponding first connecting part and is detachably connected with the first connecting part; the first connecting parts between two adjacent crank throws are mutually abutted. The sectional crankshaft provided by the utility model enables each main journal to be completely wrapped in the corresponding two first connecting parts so as to strengthen the design of the crank throw part of the crankshaft, improve the structural strength of the crankshaft, and reduce the problems of damage, breakage and the like of the crankshaft caused by bending fatigue; and the local structure can be conveniently replaced and maintained when a certain part is damaged, so that the maintenance cost is greatly reduced.

Description

Sectional type bent axle and marine engine

Technical Field

The utility model relates to a marine engine field especially relates to a sectional type bent axle and marine engine.

Background

The crankshaft is the most important part of the diesel engine, and the crankshaft is used for collecting the work generated by each cylinder of the diesel engine and transmitting the work in a rotary motion mode. In the process of diesel engine operation, the crankshaft is subjected to the combined action of a plurality of large loading forces such as periodically-changed torsion, bending and compression, so that the crankshaft is easy to generate torsion and bending deformation, further cracks, even breakage and other damage accidents.

Fatigue cracks are a significant cause of crankshaft damage, and the portions of the crankshaft where fatigue cracks occur are often at locations where stress concentration is severe. Therefore, when designing a crankshaft, attention is paid to a method of reinforcing a stress concentration portion and alleviating the stress concentration phenomenon in order to provide the crankshaft with sufficient fatigue strength. But the crank shaft has a complex shape, and the stress concentration phenomenon is quite serious, particularly in the fillet transition area from the crank shaft to the crank neck and other rough parts.

The existing crankshaft comprises an integral structure and a split structure, wherein the integral crankshaft is mostly adopted by a small diesel engine; the large diesel engine mostly adopts a split type crankshaft, and usually the split type crankshaft is formed by connecting a crank throw and a main journal by a red sleeve. Once the split crankshaft with the structure is damaged, the whole crankshaft is usually replaced, and the crankshaft is a part with higher manufacturing cost in the diesel engine, so that the structure is complex, the manufacturing technology is strict, and the maintenance cost of the whole diesel engine can be greatly increased by replacing the crankshaft.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a sectional type bent axle and marine engine has improved the structural strength of bent axle, has reduced the power that the bent axle damaged, can also realize the maintenance and the change of part spare part under the circumstances that the bent axle takes place to damage, reduces cost of maintenance.

To achieve the purpose, the utility model adopts the following technical proposal:

the crank throw comprises two crank arms arranged at intervals and a connecting rod journal for connecting the two crank arms, one side of each crank arm facing the main journal is provided with a first connecting part, and the crank arms and the corresponding first connecting parts are integrally formed;

one end of the main journal is inserted into the corresponding first connecting part and is detachably connected with the first connecting part; the first connecting parts between two adjacent crank throws are mutually abutted.

As a preferable embodiment of the segmented crankshaft, the main journal and the first connecting portion are detachably connected by at least two circumferentially arranged fastening members.

As a preferable technical solution of the above-mentioned segmented crankshaft, one end of the main journal passes through the first connecting portion and extends into the crank arm connected to the first connecting portion, and the main journal does not pass through the crank arm.

As a preferable technical scheme of the segmented crankshaft, at least three crank throws are provided, and two adjacent crank throws are connected through one main journal.

As a preferable technical solution of the above-mentioned segmented crankshaft, the segmented crankshaft further includes a crankshaft front end and a crankshaft rear end, the bell crank is located between the crankshaft front end and the crankshaft rear end, the crankshaft front end is detachably connected to the bell crank adjacent thereto, and the crankshaft rear end is detachably connected to the bell crank adjacent thereto.

As a preferable technical solution of the above-mentioned segmented crankshaft, a second connecting portion integrally provided with the crank arm adjacent to the front end of the crankshaft is provided, and one end of the front end of the crankshaft is inserted into the corresponding second connecting portion and connected with the second connecting portion by at least two fasteners circumferentially arranged;

and/or a second connecting part which is integrally arranged with the crank arm is arranged on the crank arm adjacent to the rear end of the crank shaft, and one end of the rear end of the crank shaft is inserted into the corresponding second connecting part and is connected with the second connecting part through at least two fasteners which are circumferentially distributed.

As a preferable technical solution of the above-mentioned segmented crankshaft, the bell crank and/or the main journal and/or the crankshaft front end and/or the crankshaft rear end are made by a 3D additive manufacturing process.

As a preferable technical solution of the above-mentioned segmented crankshaft, the bell crank and/or the main journal and/or the front end of the crankshaft and/or the rear end of the crankshaft manufactured by the 3D additive manufacturing process have a honeycomb structure.

As a preferable technical scheme of the sectional crankshaft, the honeycomb structure is a regular hexagon porous structure.

The utility model also provides a marine engine, including foretell sectional type bent axle.

The utility model has the advantages that: the utility model provides a sectional type bent axle, with the one end of main journal insert in the first connecting portion that corresponds and with this first connecting portion detachable connection, and make the first connecting portion between two adjacent cranks butt each other, make every main journal all wrap up in two corresponding first connecting portions completely, in order to strengthen the design to the bent axle crank position, improved the structural strength of bent axle, reduced the bent axle because of the damage and the rupture scheduling problem that bending fatigue produced; and the local structure can be conveniently replaced and maintained when a certain part is damaged, so that the maintenance cost is greatly reduced.

The utility model also provides a marine engine, including foretell sectional type bent axle, satisfy the engine to the requirement of bent axle structural strength, the convenience is carried out local the change to the bent axle of trouble, has reduced cost of maintenance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a crankshaft provided in an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

fig. 3 is a cross-sectional view of a crankshaft provided by an embodiment of the present invention;

fig. 4 is a schematic partial enlarged view of a crankshaft according to an embodiment of the present invention.

In the figure:

1. a crank throw; 11. a crank arm; 12. a connecting rod journal; 13. a first connection portion; 14. a second connecting portion; 15. a first through hole;

2. a main journal; 21. a first threaded hole; 3. a crankshaft front end; 4. the rear end of the crankshaft.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

As shown in fig. 1 to 4, the present embodiment provides a segmented crankshaft, which includes four bell cranks 1 and three main journals 2, wherein two adjacent bell cranks 1 are connected by one main journal 2. In other embodiments, the segmented crankshaft is not limited to four cranks 1 and three main journals 2, and is specifically configured according to actual requirements.

The crank throw 1 comprises two crank arms 11 arranged at intervals and connecting rod journals 12 connecting the two crank arms 11, a first connecting part 13 is arranged on one side, facing the main journal 2, of each crank arm 11, and the crank arms 11 and the corresponding first connecting parts 13 are integrally formed; one end of the main journal 2 is inserted into the corresponding first connecting part 13 and is detachably connected with the first connecting part 13; the first connecting portions 13 between two adjacent bell cranks 1 abut against each other.

In the embodiment, one end of each main journal 2 is inserted into the corresponding first connecting part 13 and detachably connected with the first connecting part 13, and the first connecting parts 13 between two adjacent crank throws 1 are mutually abutted, so that each main journal 2 is completely wrapped in the corresponding two first connecting parts 13, the crank throw 1 part of the crankshaft is reinforced, the structural strength of the crankshaft is improved, and the problems of damage, breakage and the like of the crankshaft caused by bending fatigue are reduced; and the local structure can be conveniently replaced and maintained when a certain part is damaged, so that the maintenance cost is greatly reduced.

In particular, the main journal 2 and the first connection portion 13 are detachably connected by at least two circumferentially arranged fasteners. In this embodiment, the fastener is the bolt, and every main journal 2 and the bolted connection of the first connecting portion 13 that corresponds are through four pairs of circumference equidistant distribution, and every axial interval distribution along first connecting portion 13 is followed to the bolt, and the connected mode is simple, and convenient to detach through the restriction to the fastener number, has improved the stability that main journal 2 and first connecting portion 13 are connected.

More specifically, be equipped with first screw hole 21 on the trunnion 2, be equipped with first through-hole 15 on the first connecting portion 13, above-mentioned first through-hole 15 is the unthreaded hole, and first through-hole 15 and threaded connection are passed to the one end of bolt in first screw hole 21. In order to avoid the influence of the exposed bolt on the appearance and the interference to other structural members, in the present embodiment, the first through hole 15 is formed as a stepped hole, and the head of the bolt is completely disposed in the large neck hole of the stepped hole and abuts against the stepped surface of the stepped hole.

In this embodiment, one end of the main journal 2 passes through the first connecting portion 13 and extends into the crank arm 11 connected to the first connecting portion 13, and the main journal 2 does not pass through the crank arm 11, so as to ensure that the overall structure of the crankshaft is not changed and the performance of the crankshaft is ensured.

Further, the sectional type crankshaft further comprises a crankshaft front end 3 and a crankshaft rear end 4, the crank throw 1 is located between the crankshaft front end 3 and the crankshaft rear end 4, the crankshaft front end 3 is detachably connected with the crank throw 1 adjacent to the crankshaft front end 3, and the crankshaft rear end 4 is detachably connected with the crank throw 1 adjacent to the crankshaft rear end 4. Specifically, a second connecting portion 14 is integrally provided on the crank arm 11 adjacent to the crankshaft front end 3, and one end of the crankshaft front end 3 is inserted into the corresponding second connecting portion 14 and connected to the second connecting portion 14 by at least two circumferentially arranged fasteners.

The crank arm 11 adjacent to the crankshaft rear end 4 is provided with a second connecting portion 14 integrally arranged with the crankshaft rear end 4, and one end of the crankshaft rear end 4 is inserted into the corresponding second connecting portion 14 and is connected with the second connecting portion 14 through at least two fasteners arranged in the circumferential direction.

By adopting the arrangement, when the front end 3 and the rear end 4 of the crankshaft and the crank throw 1 connected with the front end and the rear end are damaged, local structure replacement and maintenance are carried out, and the maintenance cost is reduced.

More specifically, be equipped with the second screw hole on the bent axle front end 3, be equipped with the second through-hole on the second connecting portion 14, above-mentioned second through-hole is the unthreaded hole, and second through-hole and threaded connection are passed in the second screw hole to the one end of bolt. In order to avoid the influence of the exposed bolt on the appearance and the interference on other structural members, the second through hole is a stepped hole, and the head of the bolt is completely arranged in the large neck hole of the stepped hole and abuts against the stepped surface of the stepped hole.

Further, in the present embodiment, the bell crank 1, the main journal 2, the crankshaft front end 3, and the crankshaft rear end 4 are all made by a 3D additive manufacturing process. Based on 3D vibration material disk technique, can be according to the different application scenes of bent axle, at different position different materials of stack, conveniently strengthen the local structure of bent axle, avoid defects such as scar, bubble and shrinkage cavity that traditional bent axle exists when adopting forging process preparation simultaneously, can also realize the accurate of bent axle shaping shape to controlling.

Further, the crank throw 1, the main journal 2, the crankshaft front end 3 and the crankshaft rear end 4 which are manufactured by the 3D additive manufacturing process are all of a honeycomb structure. Preferably, the honeycomb structure is a regular hexagon porous structure, so that the weight of the crankshaft can be reduced to the maximum extent while the structural strength of the crankshaft is ensured, and the requirements of a high-speed diesel engine on the structural strength and the weight of the crankshaft can be met.

The embodiment also provides a ship engine which comprises the segmented crankshaft.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Claims

1. The segmented crankshaft comprises at least two crank throws (1) which are sequentially arranged along the axial direction and a main journal (2) which is positioned between every two adjacent crank throws (1), and is characterized in that each crank throw (1) comprises two crank arms (11) which are arranged at intervals and a connecting rod journal (12) which is connected with the two crank arms (11), one side of each crank arm (11) facing the main journal (2) is provided with a first connecting part (13), and the crank arms (11) and the corresponding first connecting parts (13) are integrally formed;

one end of the main journal (2) is inserted into the corresponding first connecting part (13) and is detachably connected with the first connecting part (13); the first connecting parts (13) between two adjacent crank throws (1) are mutually abutted.

2. The segmented crankshaft according to claim 1, characterized in that the main journal (2) and the first connection (13) are detachably connected by means of at least two circumferentially arranged fasteners.

3. The segmented crankshaft according to claim 1, characterized in that one end of the main journal (2) passes through the first connection portion (13) and protrudes into the crank arm (11) connected to the first connection portion (13), and the main journal (2) does not pass through the crank arm (11).

4. The segmented crankshaft according to claim 1, characterized in that the crank throws (1) are provided in at least three, two adjacent crank throws (1) being connected by one main journal (2).

5. The segmented crankshaft according to claim 4, further comprising a crankshaft front end (3) and a crankshaft rear end (4), wherein the bell crank (1) is located between the crankshaft front end (3) and the crankshaft rear end (4), the crankshaft front end (3) is detachably connected with the bell crank (1) adjacent thereto, and the crankshaft rear end (4) is detachably connected with the bell crank (1) adjacent thereto.

6. The segmented crankshaft according to claim 5, characterized in that a second connecting portion (14) is provided integrally with the crank arm (11) adjacent to the crankshaft nose (3), one end of the crankshaft nose (3) being inserted into the corresponding second connecting portion (14) and being connected to the second connecting portion (14) by at least two circumferentially arranged fasteners;

and/or a second connecting part (14) which is integrally arranged with the crank arm (11) adjacent to the rear end (4) of the crank shaft is arranged on the crank arm, one end of the rear end (4) of the crank shaft is inserted into the corresponding second connecting part (14) and is connected with the second connecting part (14) through at least two fastening pieces which are circumferentially arranged.

7. The segmented crankshaft according to claim 5 or 6, characterized in that the bell crank (1) and/or the main journal (2) and/or the crankshaft front end (3) and/or the crankshaft rear end (4) are made by a 3D additive manufacturing process.

8. The segmented crankshaft according to claim 7, characterized in that the bell crank (1) and/or the main journal (2) and/or the crankshaft front end (3) and/or the crankshaft rear end (4) made by a 3D additive manufacturing process is of a honeycomb structure.

9. The segmented crankshaft of claim 8, wherein the honeycomb structure is a regular hexagonal cellular structure.

10. A marine engine comprising the segmented crankshaft of any one of claims 1 to 9.