Crankshaft assembly and engine

Abstract

The utility model provides a crankshaft assembly which is arranged in a casing of an engine and comprises a first crankshaft, a first connecting disc, a first middle crankshaft, a second middle crankshaft, a second connecting disc and a second crankshaft, the first middle crankshaft is connected with the first crankshaft through the first connecting disc, and the second middle crankshaft is connected with the first middle crankshaft. The second crankshaft is connected with the second middle crankshaft through the second connecting disc, and the first middle crankshaft comprises a first middle journal connected with the first connecting disc, a connecting shaft connected with the second middle crankshaft and a first middle crank connected with the first middle journal and the connecting shaft. The second middle crankshaft comprises a second middle journal connected with the second connecting disc and a second middle crank connected with the connecting shaft, the connecting shaft is sleeved with a first middle bearing, a second middle bearing and an air seal ring, and the first middle bearing, the second middle bearing and the air seal ring are arranged between the first middle crank and the second middle crank. The air seal ring is located between the first middle bearing and the second middle bearing. The positioning rings and the thrust rings are arranged among the main journals on the two sides, the connecting shaft and the case to limit and restrain the positions of the corresponding bearings, so that the axial positioning function of the whole crankshaft in a crankcase is achieved, and oil and gas on the two sides of the crankcase can be prevented from leaking mutually due to the arrangement of the gas sealing rings.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine, especially a crankshaft assembly and engine. BACKGROUND

[0002] At present, the crankshafts used by the traditional four-cylinder internal combustion engine are mostly of integral structure, although the integral crankshaft is simple to manufacture, has a smaller processing difficulty and a lower cost, however, after the integral crankshaft is used by the internal combustion engine, the overall volume of the internal combustion engine becomes larger and the weight becomes heavier. For the demand of smaller volume and weight of the internal combustion engine, many manufacturers adopt split crankshafts. However, the split crankshaft of the prior art has the problems of complex structure, difficult press fitting, poor strength, large axial displacement and the phenomenon of mutual flow of oil and gas in the two adjacent cavities in the crankcase during the operation of the engine.

[0003] Therefore, it is necessary to provide a crankshaft assembly and engine to overcome the above-mentioned defects. SUMMARY

[0004] The utility model discloses a kind of crankshaft assemblies and engines.

[0005] According to an aspect of the utility model, a crankshaft assembly is provided, which is arranged in the engine case of engine, comprising:

[0006] First crankshaft;

[0007] First connecting disc;

[0008] First intermediate crankshaft, the first intermediate crankshaft is connected with first crankshaft by first connecting disc;

[0009] Second intermediate crankshaft, the second intermediate crankshaft is connected with first intermediate crankshaft;

[0010] Second connecting disc;

[0011] Second crankshaft, the second crankshaft is connected with second intermediate crankshaft by second connecting disc;

[0012] The first intermediate crankshaft includes first intermediate journal connected with first connecting disc, connecting shaft connected with second intermediate crankshaft and first intermediate crank connected with first intermediate journal and connecting shaft;

[0013] The second intermediate crankshaft includes second intermediate journal connected with second connecting disc and second intermediate crank connected with connecting shaft, first intermediate bearing, second intermediate bearing and gas seal ring are sleeved on connecting shaft, first intermediate bearing, second intermediate bearing and gas seal ring are arranged between first intermediate crank and second intermediate crank, and gas seal ring is located between first intermediate bearing and second intermediate bearing.

[0014] Preferably, the first crankshaft comprises a first crank, a first main journal and a first connecting rod journal extending from the first crank on two sides respectively, and the second crankshaft comprises a second crank, a second main journal and a second connecting rod journal extending from the second crank on two sides respectively.

[0015] The first connecting plate is connected with the first crankshaft through the first connecting rod journal, and the second connecting plate is connected with the second crankshaft through the second connecting rod journal.

[0016] Preferably, the second intermediate crank further comprises a connecting hole for the connecting shaft to pass through.

[0017] Preferably, a first thrust ring is arranged between the first intermediate bearing and the gas seal ring, and a second thrust ring is arranged between the second intermediate bearing and the gas seal ring.

[0018] Preferably, the outer ring of the gas seal ring is provided with a positioning pin hole, and the inner ring of the gas seal ring is adjacent to a plurality of sealing ring grooves, and the cross section of the sealing ring groove is in the shape of an elliptical arc.

[0019] Preferably, the first main journal and the first connecting rod journal are eccentrically arranged, the second main journal and the second connecting rod journal are eccentrically arranged, and the first intermediate journal and the connecting shaft are eccentrically arranged.

[0020] Preferably, the first connecting plate comprises a first eccentric hole and a second eccentric hole, the first connecting rod journal passes through and is fixed in the first eccentric hole, and the first intermediate journal passes through and is fixed in the second eccentric hole, the second connecting plate comprises a third eccentric hole and a fourth eccentric hole, the second connecting rod journal passes through and is fixed in the third eccentric hole, and the second intermediate journal passes through and is fixed in the fourth eccentric hole.

[0021] Preferably, the first main journal, the connecting shaft and the second main journal are coaxially arranged.

[0022] Preferably, a connecting rod is arranged on each of the first connecting rod journal, the first intermediate journal, the second intermediate journal and the second connecting rod journal.

[0023] Preferably, a boss is arranged on the first crank on the circumferential side of the first main journal, a boss is arranged on the second crank on the circumferential side of the second main journal, a boss is arranged on the first intermediate crank on the circumferential side of the connecting shaft, and a boss is arranged on the second intermediate crank on the circumferential side of the connecting hole.

[0024] According to another aspect of the utility model, provide a kind of engine, including the crankshaft assembly and the engine housing of above-mentioned, the first mounting hole and the second mounting hole are equipped respectively in the both ends of the engine housing, the first main journal is supported in the first mounting hole by first bearing and second bearing, the boss of the second bearing and first crank is resisted, the second main journal is supported in the second mounting hole by third bearing and fourth bearing, the boss of the third bearing and second crank is resisted.

[0025] Preferably, first ring groove and second ring groove are formed on the inner wall of the first mounting hole, a third thrust ring is arranged in the first ring groove, and a first positioning ring is arranged in the second ring groove.

[0026] Preferably, third ring groove and fourth ring groove are formed on the inner wall of the second mounting hole, a fourth thrust ring is arranged in the third ring groove, and a second positioning ring is arranged in the fourth ring groove.

[0027] Preferably, an intermediate mounting hole is arranged in the middle of the engine housing, the connecting shaft is supported in the intermediate mounting hole by a first intermediate bearing and a second intermediate bearing, a first intermediate ring groove and a second intermediate ring groove are formed on the inner wall of the intermediate mounting hole, the first thrust ring is arranged in the first intermediate ring groove, and the second thrust ring is arranged in the second intermediate ring groove.

[0028] Compared with the prior art, the crankshaft assembly and the engine provided by the utility model have the following beneficial effects:

[0029] Due to the adoption of the above technical scheme, the utility model has the advantages of simple structure, ingenious design, convenient press fitting, high strength, good reliability, reduced weight of the crankshaft as a whole, and the positioning ring and the thrust ring arranged between the two main journals and the connecting shaft and the engine housing to limit and constrain the positions of the corresponding bearings, thereby achieving the axial positioning function of the crankshaft as a whole in the crankcase, the gas seal ring arranged to prevent the oil and gas on both sides of the crankcase from leaking into each other, and further improved product structure. BRIEF DESCRIPTION OF DRAWINGS

[0030] The utility model will be further described in detail below in combination with the drawings and specific embodiments:

[0031] Figure 1 It is the perspective view of the crankshaft assembly of the utility model;

[0032] Figure 2 It is the explosion view of the crankshaft assembly of the utility model;

[0033] Figure 3 It is the perspective view of the first crankshaft of the utility model;

[0034] Figure 4 It is the perspective view of the first connecting disc of the utility model;

[0035] Figure 5 It is the perspective view of the second intermediate crankshaft of the utility model;

[0036] Figure 6 It is the sectional view of the gas seal ring of the utility model;

[0037] Figure 7 It is the sectional view of the crankshaft assembly installed in the inside of the machine case of the utility model.

[0038] Among them, A. crankshaft assembly, 1. first crankshaft, 11. first crank, 12. first main journal, 13. first connecting rod journal, 2. first connecting disc, 21. first eccentric hole, 22. second eccentric hole, 3. first intermediate crankshaft, 31. first intermediate crank, 32. first intermediate journal, 33. connecting shaft, 4. second intermediate crankshaft, 41. second intermediate crank, 42. second intermediate journal, 43. connecting hole, 5. second connecting disc, 6. second crankshaft, 61. second crank, 62. second main journal, 63. second connecting rod journal, 7. gas seal ring, 71. sealing ring groove, 72. weight reduction groove, 73. positioning pin hole, 81. first intermediate bearing, 82. second intermediate bearing, 83. first thrust ring, 84. second thrust ring, 85. first bearing, 86. second bearing, 87. third bearing, 88. fourth bearing, 9. connecting rod, 10. boss, B. machine case, b1. first mounting hole, b11 first ring groove, b12 second ring groove, b13. third thrust ring, b14. first positioning ring, b2. second mounting hole, b21. third ring groove, b22. fourth ring groove, b23. fourth thrust ring, b24. second positioning ring, b3. intermediate mounting hole, b31. first intermediate ring groove, b32. second intermediate ring groove. DETAILED DESCRIPTION

[0039] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0040] For the sake of simplicity of the drawing, only the parts related to the present application are shown in the drawings, which do not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this document, "one" not only means "only one", but also means "more than one" in some cases.

[0041] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations, and includes these combinations.

[0042] In this document, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In addition, in the description of the present application, the terms "first", "second" and the like are only used for differentiation and description, and cannot be understood as indicating or implying relative importance.

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor, and other embodiments can also be obtained.

[0045] Referring to Figure 1 The present embodiment discloses a crankshaft assembly A, which is arranged in an engine case B of an engine, comprising a first crankshaft 1, a first connecting disc 2, a first intermediate crankshaft 3, a second intermediate crankshaft 4, a second connecting disc 5 and a second crankshaft 6.

[0046] The first crankshaft 1, the first connecting disc 2, the first intermediate crankshaft 3, the second intermediate crankshaft 4, the second connecting disc 5 and the second crankshaft 6 are sequentially connected and fixed, assembled into one body, forming the crankshaft assembly A.

[0047] Referring to Figure 2, the first crankshaft 1 is integrally formed, comprising a first crank 11, a first main journal 12 and a first connecting rod journal 13 extending from the first crank 11 to both sides respectively. The first main journal 12 is supported in the mounting hole on one side of the housing B, and the first crank 11 and the first connecting rod journal 13 are both arranged in the housing B. The second crankshaft 6 is integrally formed, comprising a second crank 61, a second main journal 62 and a second connecting rod journal 63 extending from the second crank 61 to both sides respectively. The second main journal 62 is supported in the mounting hole on the other side of the housing B, and the second crank 61 and the second connecting rod journal 63 are both arranged in the housing B.

[0048] Referring to Figure 3 、 Figure 4 and Figure 5 , the first intermediate crankshaft 3 is integrally formed, comprising a first intermediate crank 31, a first intermediate journal 32 and a connecting shaft 33 extending from the first intermediate crank 31 to both sides respectively. The second intermediate crankshaft 4 is integrally formed, comprising a second intermediate crank 41 and a second intermediate journal 42 extending from the second intermediate crank 41 to the second crankshaft 6. The second intermediate crank 41 is provided with a connecting hole 43, and the connecting shaft 33 is press-fitted in the connecting hole 43 to realize the connection and fixation of the first intermediate crankshaft 3 and the second intermediate crankshaft 4.

[0049] The first main journal 12 and the first connecting rod journal 13 are eccentrically arranged, the second main journal 62 and the second connecting rod journal 63 are eccentrically arranged, and the first intermediate journal 32 and the connecting shaft 33 are eccentrically arranged. The first main journal 12, the connecting shaft 33 and the second main journal 62 in the crankshaft assembly A are coaxially arranged.

[0050] The first connecting disc 2 comprises a first eccentric hole 21 and a second eccentric hole 22, and the first eccentric hole 21 and the second eccentric hole 22 are located at the upper and lower ends of the first connecting disc 2 respectively. The first connecting rod journal 13 is fixedly fitted in the first eccentric hole 21, and the first intermediate journal 32 is fixedly fitted in the second eccentric hole 22. The second connecting disc 5 has the same structure as the first connecting disc 2 and comprises a third eccentric hole and a fourth eccentric hole (not marked in the figure). The third eccentric hole and the fourth eccentric hole are located at the upper and lower ends of the second connecting disc 5 respectively. The second connecting rod journal 63 is fixedly fitted in the third eccentric hole, and the second intermediate journal 42 is fixedly fitted in the fourth eccentric hole.

[0051] The connecting shaft 33 is sleeved with a first intermediate bearing 81, a second intermediate bearing 82 and a gas seal ring 7. The first intermediate bearing 81, the second intermediate bearing 82 and the gas seal ring 7 are arranged between the first intermediate crank 31 and the second intermediate crank 41. The gas seal ring 7 is located between the first intermediate bearing 81 and the second intermediate bearing 82. A first thrust ring 83 is arranged between the first intermediate bearing 81 and the gas seal ring 7, and a second thrust ring 84 is arranged between the second intermediate bearing 82 and the gas seal ring 7. In order to prevent the gas seal ring 7 from rotating with the connecting shaft 33 during engine operation, a positioning pin hole 73 is arranged on the outer ring of the gas seal ring 7, and the positioning pin is in interference fit with the positioning pin hole 73 to fix the gas seal ring 7 on the crankcase of the engine housing B.

[0052] Referring to Figure 6 , a plurality of seal ring grooves 71 are arranged adjacent to the inner ring of the gas seal ring 7, and the cross section of the seal ring groove 71 is in the shape of an elliptical arc. From the cross section of the gas seal ring 7, the plurality of seal ring grooves 71 are connected and have a wave-like structure. It can prevent the oil and gas on both sides of the crankcase from leaking to each other, and further improve the product structure. The gas seal ring 7 is also provided with a weight reduction groove 72 on both axial sides.

[0053] A connecting rod 9 is arranged on the first connecting rod journal 13, the first intermediate shaft journal 32, the second intermediate shaft journal 42 and the second connecting rod journal 63 respectively. A boss 10 is arranged on the first crank 11 at the side of the first main shaft journal 12. A boss 10 is arranged on the second crank 61 at the side of the second main shaft journal 62. A boss 10 is arranged on the first intermediate crank 31 at the side of the connecting shaft 33. A boss 10 is arranged on the second intermediate crank 41 at the side of the connecting hole 43. During press fitting, the boss 10 will be in contact with the side surface of the corresponding bearing, thereby limiting the bearing in the axial direction. The arrangement of the boss 10 makes it unnecessary to perform surface finish machining on the entire large end surface, and only the surface finish of the boss 10 needs to be improved, so that the surface in contact with the bearing end surface needs to meet higher technical requirements, while the machining amount is reduced, the cost is reduced, and the installation reliability and accuracy are improved.

[0054] Referring to Figure 7 , the embodiment also provides an engine comprising the crankshaft assembly A and the engine housing B. The first installation hole b1 and the second installation hole b2 are arranged at the two ends of the engine housing B respectively. The first main shaft journal 12 is supported in the first installation hole b1 by the first bearing 85 and the second bearing 86, and the second bearing 86 abuts against the boss 10 of the first crank 11. The second main shaft journal 62 is supported in the second installation hole b2 by the third bearing 87 and the fourth bearing 88, and the third bearing 87 abuts against the boss 10 of the second crank 61.

[0055] The inner wall of the first mounting hole b1 is provided with a first ring groove b11 and a second ring groove b12 at intervals, the first ring groove b11 is provided with a third thrust ring b13, and the second ring groove b12 is provided with a first positioning ring b14. The third thrust ring b13 and the first positioning ring b14 are located between the first bearing 85 and the second bearing 86, the third thrust ring b13 abuts against the first bearing 85, and the first positioning ring b14 abuts against the second bearing 86.

[0056] The inner wall of the second mounting hole b2 is provided with a third ring groove b21 and a fourth ring groove b22 at intervals, the third ring groove b21 is provided with a fourth thrust ring b23, and the fourth ring groove b22 is provided with a second positioning ring b24. The fourth thrust ring b23 and the second positioning ring b24 are located between the third bearing 87 and the fourth bearing 88, the fourth thrust ring b23 abuts against the third bearing 87, and the second positioning ring b24 abuts against the fourth bearing 88.

[0057] The middle part of the crankcase B is provided with a middle mounting hole b3, and the connecting shaft 33 is supported in the middle mounting hole b3 through a first middle bearing 81 and a second middle bearing 82. The inner wall of the middle mounting hole b3 is provided with a first middle ring groove b31 and a second middle ring groove b32. The first thrust ring 83 is arranged in the first middle ring groove b31, and the second thrust ring 84 is arranged in the second middle ring groove b32. The positions of the corresponding bearings are limited and constrained through the positioning ring and the thrust ring between the two side main shaft necks and the connecting shaft 33 and the crankcase B, so that the axial positioning function of the whole crankshaft in the crankcase is realized.

[0058] It is obvious for those skilled in the art that various modifications and variations can be made to the above exemplary embodiments of the utility model without departing from the spirit and scope of the utility model. Therefore, it is intended to cover the modifications and variations of the utility model falling within the scope of the appended claims and their equivalent technical solutions.

Claims

1. A crankshaft assembly disposed within a case of an engine, characterized by, The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing.

2. The crankshaft assembly of claim 1, wherein, The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing.

3. The crankshaft assembly of claim 2, wherein, The application relates to a crankshaft assembly and a housing.

4. The crankshaft assembly of claim 3, wherein, The application relates to a crankshaft assembly and a housing.

5. The crankshaft assembly of claim 4, wherein, The application relates to a crankshaft assembly and a housing.

6. The crankshaft assembly of claim 5, wherein, The application relates to a crankshaft assembly and a housing.

7. The crankshaft assembly of claim 6, wherein, The application relates to a crankshaft assembly and a housing.

8. The crankshaft assembly of claim 7, wherein, The application relates to a crankshaft assembly and a housing.

9. The crankshaft assembly of claim 8, wherein, The application relates to a crankshaft assembly and a housing.

10. The crankshaft assembly of claim 9, wherein, The application relates to a crankshaft assembly and a housing.

11. An engine characterized by, The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly and a housing. 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The application relates to a crankshaft assembly and a housing. The application relates to a crankshaft assembly 12. The engine of claim 11, wherein, The inner wall of the first mounting hole is provided with a first ring groove and a second ring groove at intervals, the first ring groove is provided with a third thrust ring, the second ring groove is provided with a first positioning ring, the third thrust ring and the first positioning ring are located between the first bearing and the second bearing, the third thrust ring abuts against the first bearing, and the first positioning ring abuts against the second bearing.

13. The engine of claim 12, wherein, The inner wall of the second mounting hole is provided with a third ring groove and a fourth ring groove at intervals, the third ring groove is provided with a fourth thrust ring, the fourth ring groove is provided with a second positioning ring, the fourth thrust ring and the second positioning ring are located between the third bearing and the fourth bearing, the fourth thrust ring abuts against the third bearing, and the second positioning ring abuts against the fourth bearing.

14. The engine of claim 13, wherein, The middle part of the machine case is provided with a middle mounting hole, the connecting shaft is supported in the middle mounting hole through a first middle bearing and a second middle bearing, the inner wall of the middle mounting hole is provided with a first middle ring groove and a second middle ring groove, the first thrust ring is arranged in the first middle ring groove, and the second thrust ring is arranged in the second middle ring groove.

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