A crankshaft assembly and an engine

Abstract

The present invention discloses a crankshaft assembly and an engine, belonging to the technical field of crankshafts. The crankshaft assembly of the present invention includes a crankshaft body, a threaded flange, a first gear, a second gear, and a torsional vibration damper. Both ends of the crankshaft body are provided with external thread segments, and the thread entry direction of the external thread segments is opposite to the rotation direction of the crankshaft body; two threaded flanges are respectively threadedly connected to the two external thread segments; the first gear is sleeved on the outside of one end of the crankshaft body and fixedly connected to the crankshaft body; the second gear is sleeved on the outside of one of the threaded flanges and fixedly connected to the threaded flange, and the second gear and the first gear are respectively located at both ends of the crankshaft body; the torsional vibration damper is fixed on one side of the second gear. The front and rear ends of the crankshaft body output power or transmit torque through the threaded flange structure, and both ends can output relatively large power without any design changes, significantly improving the versatility of engine design.

Description

Technical Field

[0001] The present invention relates to the technical field of crankshafts, and in particular to a crankshaft assembly and an engine. Background Art

[0002] The crankshaft is a key power output part of the engine. All components connected to the crankshaft are important moving parts. Whether the connection form is reliable and easy to disassemble and assemble directly affects the operation stability and reliability of the entire engine.

[0003] Generally, the power output connection structure of the crankshaft on marine high-power diesel engines / gas engines is mostly a flange structure + bolt connection or a tapered surface interference connection. However, the tapered surface interference connection requires very high machining accuracy, is not easy to assemble and disassemble multiple times, and requires special disassembly tools; for the flange structure + bolt connection, the structures at the front and rear ends of the crankshaft are quite different, and the flexibility and versatility are poor. If the power output at the rear end is changed to the front end, major design adjustments need to be made to the structures at the front and rear ends of the crankshaft. Summary of the Invention

[0004] The purpose of the present invention is to provide a crankshaft assembly and an engine, which can output large torque at both ends of the crankshaft without changing the crankshaft design, and the crankshaft assembly is convenient for installation and disassembly, easy to machine and manufacture, has a low cost, and improves the applicability of the power output end of the engine.

[0005] To achieve the above purpose, the following technical solutions are provided:

[0006] On the one hand, a crankshaft assembly is provided, including:

[0007] A crankshaft body, with external thread sections provided at both ends thereof, and the thread advancing direction of the external thread sections is opposite to the rotation direction of the crankshaft body;

[0008] Threaded flanges, two of which are respectively threadedly connected to the two external thread sections;

[0009] A first gear, which is sleeved on the outside of one end of the crankshaft body and fixedly connected to the crankshaft body;

[0010] A second gear, which is sleeved on the outside of one of the threaded flanges and fixedly connected to the threaded flange, and the second gear and the first gear are respectively located at both ends of the crankshaft body;

[0011] A torsional vibration damper, which is fixed on one side of the second gear.

[0012] Optionally, thread relief sections are provided at the starting ends of the threads of the external thread sections, and the outer diameter of the thread relief sections is smaller than the outer diameter of the external thread sections.

[0013] Optionally, first positioning segments are provided at both ends of the crankshaft body. The first positioning segments and the external thread segments are respectively located at both ends of the thread avoidance segment. Second positioning segments are provided in the shaft holes of the threaded flanges. The outer diameter of the first positioning segment is equal to the inner diameter of the second positioning segment.

[0014] Optionally, thrust platforms are provided at the threaded ends of the external thread segments. One end of the threaded flange is provided with a flange thrust surface, and the flange thrust surface abuts against the thrust platform.

[0015] Optionally, the crankshaft assembly further includes two fixed flanges for fixing the threaded flanges, and the fixed flanges are respectively fixedly connected to both ends of the crankshaft body.

[0016] Optionally, a transition block is provided between the torsional vibration damper and the second gear. One end of the transition block abuts against the torsional vibration damper, and the other end abuts against the second gear.

[0017] Optionally, a plurality of tightening holes are circumferentially provided on the outer side of the threaded flange.

[0018] Optionally, the outer diameters of the external thread segments at both ends of the crankshaft body are equal.

[0019] Optionally, internal thread segments matching the external thread segments are provided in the shaft holes of the threaded flanges. The two threaded flanges are divided into a wide-threaded flange and a narrow-threaded flange according to the length of the internal thread segments. The second gear is sleeved on the outside of the wide-threaded flange and fixedly connected thereto.

[0020] On the other hand, an engine is provided, including the crankshaft assembly as described above.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] The crankshaft assembly of the present invention includes a crankshaft body, threaded flanges, a first gear, a second gear, and a torsional vibration damper. External thread segments are provided at both ends of the crankshaft body, and the thread rotation direction of the external thread segments is opposite to the rotation direction of the crankshaft body. The two threaded flanges are respectively threadedly connected to the two external thread segments. The first gear is sleeved on the outside of one end of the crankshaft body and fixedly connected to the crankshaft body. The second gear is sleeved on the outside of one of the threaded flanges and fixedly connected to the threaded flange. The second gear and the first gear are respectively located at both ends of the crankshaft body. The torsional vibration damper is fixed on one side of the second gear. The front and rear ends of the crankshaft body output power or transmit torque through the threaded flange structure. Larger power can be output at both ends without any design changes, significantly improving the versatility of the engine design. The front and rear ends of the crankshaft assembly adopt the same form of threaded flange structure to fasten each component to the crankshaft, making the structure the simplest and most reliable, and the assembly and disassembly are very convenient, making the engine more operable and maintainable. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of the crankshaft assembly in an embodiment of the present invention;

[0024] Figure 2 It is an axial sectional view of the crankshaft assembly in an embodiment of the present invention;

[0025] Figure 3 In an embodiment of the present invention Figure 2 An enlarged view of part A;

[0026] Figure 4 In an embodiment of the present invention Figure 2 An enlarged view of part B;

[0027] Figure 5 It is a schematic diagram of the end of the crankshaft body in an embodiment of the present invention;

[0028] Figure 6 It is a schematic structural diagram of the threaded flange in an embodiment of the present invention;

[0029] Figure 7 It is an axial sectional view of the threaded flange in an embodiment of the present invention.

[0030] Reference numerals:

[0031] 1. Crankshaft body; 11. External thread section; 12. Thread avoidance section; 13. First positioning section; 14. Thrust platform; 2. Threaded flange; 21. Second positioning section; 22. Tightening hole; 23. Internal thread section; 24. Flange thrust surface; 3. First gear; 4. Second gear; 5. Torsional vibration damper; 51. Transition block; 6. Fixed flange. Detailed Description of the Invention

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0034] It should be noted that like reference numerals and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0035] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the figures, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 a limitation on the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0036] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "arranged" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] In the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through other features between them. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0038] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the figures, where the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the figures are exemplary and are only used to explain the present invention and should not be construed as a limitation on the present invention.

[0039] As Figure 1-2As shown in the figure, on the one hand, in this embodiment, a crankshaft assembly is provided, which includes a crankshaft body 1, a threaded flange 2, a first gear 3, a second gear 4, and a torsional vibration damper 5. External thread sections 11 are provided at both ends of the crankshaft body 1, and the thread rotation direction of the external thread sections 11 is opposite to the rotation direction of the crankshaft body 1; two threaded flanges 2 are respectively threadedly connected to the two external thread sections 11; the first gear 3 is sleeved outside one end of the crankshaft body 1 and fixedly connected to the crankshaft body 1; the second gear 4 is sleeved outside one of the threaded flanges 2 and fixedly connected to the threaded flange 2. The second gear 4 and the first gear 3 are respectively located at both ends of the crankshaft body 1; the torsional vibration damper 5 is fixed on one side of the second gear 4. The first gear 3 is connected to the crankshaft body 1 by interference fit. The second gear 4 and the threaded flange 2 are connected by interference fit. The front and rear ends of the crankshaft assembly adopt the same form of threaded flange 2 structure to fasten each component on the crankshaft body 1, making the structure the simplest and most reliable, and the assembly and disassembly are very convenient, improving the universality of the engine design, and at the same time making the engine more operable and maintainable.

[0040] Optionally, a transition block 51 is provided between the torsional vibration damper 5 and the second gear 4. One end of the transition block 51 abuts against the torsional vibration damper 5, and the other end abuts against the second gear 4. The torsional vibration damper 5 maintains a large axial distance gap from the second gear 4 through the intermediate transition block 51, and is then fastened to the second gear 4 by bolts.

[0041] In this embodiment, the first gear 3 is installed on the threaded flange 2 at the front end of the crankshaft body 1 by interference fit as a front-end auxiliary machine gear, and the torsional vibration damper 5 is connected to the auxiliary machine gear by bolts. The second gear 4 is installed on the rear end of the crankshaft body 1 by interference fit as a timing gear, and the threaded flange 2 at the rear end of the crankshaft body 1 is connected to the flywheel to transmit torque.

[0042] As Figure 3 shown, optionally, thrust platforms 14 are provided at the threaded ends of the external thread sections 11, and a flange thrust surface 24 is provided at one end of the threaded flange 2. The flange thrust surface 24 abuts against the thrust platform 14. After the threaded flange 2 is screwed along the external thread section 11 and tightened, the flange thrust surface 24 presses against the thrust platform 14 for positioning.

[0043] Optionally, the crankshaft assembly further includes two fixing flanges 6 for fixing the threaded flanges 2. The fixing flanges 6 are respectively fixedly connected to both ends of the crankshaft body 1. The two fixing flanges 6 are respectively fixedly connected to both ends of the crankshaft body 1 by bolts, further ensuring that the flange thrust surface 24 of the threaded flange 2 is in close contact with the thrust platform 14 and is firmly fixed.

[0044] As Figure 4-5As shown, optionally, a thread avoidance section 12 is provided at the starting end of the external thread section 11, and the outer diameter of the thread avoidance section 12 is smaller than that of the external thread section 11. By means of the thread avoidance section 12, the thread length of the external thread section 11 is reduced to prevent interference between the threads of the threaded flange 2 and the crankshaft body 1.

[0045] Optionally, first positioning sections 13 are provided at both ends of the crankshaft body 1. The first positioning sections 13 and the external thread sections 11 are respectively located at both ends of the thread avoidance section 12. Second positioning sections 21 are provided in the shaft holes of the threaded flanges 2. The outer diameter of the first positioning section 13 is equal to the inner diameter of the second positioning section 21. The outer diameter of the first positioning section 13 is smaller than that of the thread avoidance section 12. The first positioning section 13 and the second positioning section 21 cooperate to ensure that the shaft ends of the crankshaft body 1 and the shaft holes of the threaded flanges 2 are on the same axis.

[0046] Optionally, the outer diameters of the external thread sections 11 at both ends of the crankshaft body 1 are equal. The flange hole sizes of the front and rear threaded flanges 2 are the same, with good processability and being convenient for machining and manufacturing.

[0047] As Figure 6-7 shown, optionally, a plurality of tightening holes 22 are provided on the outer circumference of the threaded flange 2. When tightening the threaded flange 2, a tool can be inserted into the tightening hole 22 for screwing in and tightening.

[0048] Optionally, internal thread sections 23 matching the external thread sections 11 are provided in the shaft holes of the threaded flanges 2. The two threaded flanges 2 are divided into a wide threaded flange and a narrow threaded flange according to the length of the internal thread section 23. The second gear 4 is sleeved on the outside of the wide threaded flange and fixedly connected thereto.

[0049] This embodiment also provides an engine, including the above-mentioned crankshaft assembly. By applying the above-mentioned crankshaft assembly, the universality of the engine design is improved, and at the same time, the engine is more operable and maintainable.

[0050] Note that the above is only the preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described here. Various obvious changes, re-adjustments, and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A crankshaft assembly, characterized in that, Comprising: A crankshaft body (1) with external thread segments (11) provided at both ends, the thread advancing direction of the external thread segments (11) being opposite to the rotation direction of the crankshaft body (1); Threaded flanges (2), two of the threaded flanges (2) being threadedly connected to the two external thread segments (11) respectively; A first gear (3) sleeved on the outer side of one end of the crankshaft body (1) and fixedly connected to the crankshaft body (1); A second gear (4) sleeved on the outer side of one of the threaded flanges (2) and fixedly connected to the threaded flange (2), the second gear (4) and the first gear (3) being located at both ends of the crankshaft body (1) respectively; A torsional vibration damper (5) fixed to one side of the second gear (4); Thread avoidance segments (12) are provided at the thread starting ends of the external thread segments (11), the outer diameter of the thread avoidance segments (12) being smaller than the outer diameter of the external thread segments (11); Thrust platforms (14) are provided at the thread ending ends of the external thread segments (11), and a flange thrust surface (24) is provided at one end of the threaded flange (2), the flange thrust surface (24) abutting against the thrust platform (14); 2. The crankshaft assembly according to claim 1, characterized in that, First positioning segments (13) are provided at both ends of the crankshaft body (1), the first positioning segments (13) and the external thread segments (11) being located at both ends of the thread avoidance segment (12) respectively, and second positioning segments (21) are provided in the shaft holes of the threaded flanges (2), the outer diameter of the first positioning segments (13) being equal to the inner diameter of the second positioning segments (21); 3. The crankshaft assembly according to claim 1, wherein The crankshaft assembly further includes two fixed flanges (6) for fixing the threaded flanges (2), the fixed flanges (6) being fixedly connected to both ends of the crankshaft body (1) respectively; 4. The crankshaft assembly according to claim 1, characterized in that A transition block (51) is provided between the torsional vibration damper (5) and the second gear (4), one end of the transition block (51) abutting against the torsional vibration damper (5) and the other end abutting against the second gear (4); 5. The crankshaft assembly according to claim 1, characterized in that, A plurality of tightening holes (22) are provided circumferentially on the outer side of the threaded flange (2); 6. The crankshaft assembly according to claim 1, characterized in that, The outer diameters of the external thread segments (11) at both ends of the crankshaft body (1) are equal; 7. The crankshaft assembly according to claim 1, wherein, Internal thread segments (23) matching the external thread segments (11) are provided in the shaft holes of the threaded flanges (2), the two threaded flanges (2) being divided into a wide threaded flange and a narrow threaded flange according to the length of the internal thread segments (23), and the second gear (4) is sleeved on the outer side of the wide threaded flange and fixedly connected thereto; 8. An engine, characterized in that, Comprising the crankshaft assembly according to any one of claims 1-7.

Images