CN114352374B - Timing chain transmission system and engine - Google Patents
Timing chain transmission system and engine Download PDFInfo
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- CN114352374B CN114352374B CN202210042484.0A CN202210042484A CN114352374B CN 114352374 B CN114352374 B CN 114352374B CN 202210042484 A CN202210042484 A CN 202210042484A CN 114352374 B CN114352374 B CN 114352374B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention belongs to the technical field of engines, and discloses a timing chain transmission system and an engine, wherein the timing chain transmission system comprises a first sprocket with a first row of teeth and a second row of teeth, a second sprocket with a third row of teeth and a fourth row of teeth, a first chain transmission assembly, a second chain transmission assembly and a third chain transmission assembly, and the first chain transmission assembly comprises an air inlet camshaft sprocket, an air outlet camshaft sprocket and a first chain wound on the air inlet camshaft sprocket, the air outlet camshaft sprocket and the first row of teeth; the second chain transmission assembly comprises a third sprocket and a second chain wound on the second row of teeth, the fourth row of teeth and the third sprocket; the third chain transmission assembly comprises an oil pump chain wheel and a third chain wound on the third row of teeth and the oil pump chain wheel, and the first chain and the third chain are located on the same plane. The invention reduces the axial dimension, has compact structure, reduces the occupation of the axial space of the engine, reduces the assembly difficulty by using the arrangement of the whole machine, and improves the production efficiency.
Description
Technical Field
The invention relates to the technical field of engines, in particular to a timing chain transmission system and an engine.
Background
As shown in fig. 1, a timing chain drive system 100 is provided between a crankshaft and a camshaft for driving the crankshaft and the camshaft, respectively; in some engines there is also provided an oil pump 200 for fuel supply, the oil pump 200 also being driven by the timing chain drive system 100. At present, as the performance requirements of the market on NVH (Noise, vibration, harshness, noise, vibration and harshness) are higher and higher, a balance shaft system is further arranged in the engine, the balance shaft system can obviously reduce the noise of the engine and improve the driving feeling by being provided with the balance shaft, a silent riding environment is provided for a driver and passengers, and the timing chain transmission system 100 is further used for driving the balance shaft system.
In the prior art, as shown in fig. 1, a balance shaft system includes a left balance shaft 400 and a right balance shaft 300, a timing chain transmission system 100 drives the front end of the right balance shaft 300 to rotate, the left balance shaft 400 and the right balance shaft 300 drive an engine oil pump 200 through gear transmission, the balance shaft system is arranged between the engine oil pump 200 and the timing chain transmission system 100, so that the axial dimension between the engine oil pump 200 and the timing chain transmission system 100 is larger, the axial space of an engine is occupied, and the problems of difficult overall arrangement, complex assembly process, low production efficiency and the like are caused.
Disclosure of Invention
The invention aims to provide a timing chain transmission system and an engine, which reduce the axial dimension, compact the structure, reduce the occupation of the axial space of the engine, reduce the assembly difficulty by using the arrangement of the whole machine and improve the production efficiency.
To achieve the purpose, the invention adopts the following technical scheme:
in one aspect, there is provided a timing chain drive system comprising:
a first sprocket having a first row of teeth and a second row of teeth, the first sprocket for connection with an external crankshaft;
a second sprocket having a third row of teeth and a fourth row of teeth;
the first chain transmission assembly comprises an air inlet cam shaft sprocket, an air outlet cam shaft sprocket and a first chain wound on the air inlet cam shaft sprocket, the air outlet cam shaft sprocket and the first row of teeth;
the second chain transmission assembly comprises a third sprocket and a second chain wound on the second row of teeth, the fourth row of teeth and the third sprocket;
the third chain transmission assembly comprises an oil pump chain wheel and a third chain wound on the third row of teeth and the oil pump chain wheel, and the first chain and the third chain are positioned on the same plane.
Optionally, the first chain and the third chain are located at a side of the second chain facing away from or towards a side where the balance shaft system is located, and the first chain, the second chain and the third chain are all single-sided transmission chains.
Optionally, the third sprocket and the fourth row of teeth have the same number of teeth, and the second row of teeth and the fourth row of teeth have a tooth ratio of 2:1.
Optionally, the gear ratio of the first row of teeth to the second row of teeth is 19:46, the gear ratios of the intake camshaft sprocket, the exhaust camshaft sprocket to the first row of teeth are 2:2:1, the gear ratio of the third row of teeth to the fourth row of teeth is 21:23, and the gear ratio of the third row of teeth to the oil pump sprocket is 1:2.
Optionally, the first sprocket, the second sprocket and the third sprocket are arranged in a triangle, and the first sprocket is located within an area formed by the second sprocket, the third sprocket and the oil pump sprocket.
Optionally, the fourth row of teeth and the third sprocket are located on a side of the second row of teeth adjacent to the intake camshaft sprocket and the exhaust camshaft sprocket.
Alternatively, when the external balance shaft system is provided with one balance shaft, one of the fourth row of teeth and the third sprocket is an idler wheel and the other is for connection with the balance shaft; or (b)
When the external balance shaft system is provided with two balance shafts, the fourth row of teeth and the third sprocket are connected with the two balance shafts, respectively.
Optionally, the first, second and third chain drive assemblies include a first, second and third tensioning assembly, respectively.
Optionally, the first tensioning assembly comprises a first fixed guide rail and a first movable guide rail which are arranged at the outer side of the first chain and are arranged at intervals, and a first tensioner which is propped against one side of the first movable guide rail, which is away from the first chain;
the second tensioning assembly comprises a second fixed guide rail and a second movable guide rail which are arranged outside the second chain at intervals, and a second tensioner which is propped against one side of the second movable guide rail, which is away from the second chain;
the third tensioning assembly comprises a third fixed guide rail and a third movable guide rail which are arranged at the outer side of the third chain at intervals, and a third tensioner which is propped against one side of the third movable guide rail, which is away from the third chain.
Optionally, the first tensioner and the second tensioner are both hydraulic tensioners, and the third tensioner is a torsion spring tensioner.
Optionally, the outer contact surfaces of the first fixed guide rail, the second fixed guide rail and the third fixed guide rail all have radians.
On the other hand, still provide an engine, including bent axle, intake camshaft, exhaust camshaft, oil pump and balance shaft system still include foretell timing chain drive system, first sprocket is connected with the bent axle, intake camshaft sprocket and exhaust camshaft sprocket respectively with intake camshaft with exhaust camshaft is connected, oil pump sprocket with the oil pump is connected, at least one of third sprocket and the fourth row of tooth is both connected with balance shaft in the balance shaft system.
The invention has the beneficial effects that:
the invention provides a timing chain transmission system and an engine, wherein a first chain transmission assembly, a second chain transmission assembly and a third chain transmission assembly are respectively used for driving an air inlet cam shaft sprocket, an air outlet cam shaft sprocket, a third sprocket, a fourth row of teeth and an oil pump sprocket.
The first chain and the third chain are arranged on the same plane through the first chain wheel and the second chain wheel with double rows of teeth, and even if the first chain and the third chain are arranged on the same layer along the axial direction, the three-layer transmission structure forms a two-layer transmission structure on the axial length, the axial direction size is reduced, the structure is compact, the axial space occupied by the engine is reduced, the engine structure is as compact as possible, the whole engine layout and assembly are more convenient, the production efficiency can be improved, and the production cost is reduced. And the balance shaft system and the oil pump are driven by the second chain transmission assembly and the third chain transmission assembly respectively, the balance shaft system and the oil pump are mutually independent and do not interfere with each other, the degree of freedom of the whole engine arrangement is improved, and the third chain wheel and the second chain wheel can be used for driving the two balance shafts respectively and do not interfere with each other.
Drawings
FIG. 1 is a schematic diagram of a prior art timing chain drive system;
FIG. 2 is a schematic view of a first sprocket according to an embodiment of the present invention;
FIG. 3 is a schematic view of a second sprocket according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a timing chain drive system provided in accordance with an embodiment of the present invention;
FIG. 5 is a front view of a timing chain drive system provided in accordance with an embodiment of the present invention.
In the figure:
100. a timing chain drive system; 200. an oil pump; 300. a right balance shaft; 400. a left balance shaft;
1. a first sprocket; 11. A first row of teeth; 12. A second row of teeth;
2. a second sprocket; 21. A third row of teeth; 22. A fourth row of teeth;
3. a first chain drive assembly; 31. an intake camshaft sprocket; 32. an exhaust camshaft sprocket; 33. a first chain; 341. a first fixed guide rail; 342. a first movable rail; 343. a first tensioner; 344. a fourth fixed guide rail;
4. a second chain drive assembly; 41. a third sprocket; 42. a second chain; 431. a second fixed guide rail; 432. a second movable rail; 433. a second tensioner; 434. a fifth fixed guide rail;
5. a third chain drive assembly; 51. an oil pump sprocket; 52. a third chain; 53. a third tensioning assembly; 531. a third fixed guide rail; 532. a third movable guide rail; 533. and a third tensioner.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The embodiment provides an engine, which comprises a crankshaft, an air inlet camshaft, an air outlet camshaft, an oil pump, a balance shaft system and a timing chain transmission system, and improves vibration and NVH performance by arranging the balance shaft system. The present embodiment also provides a timing chain drive system, as shown in fig. 2-5, comprising a first sprocket 1, a second sprocket 2, a first chain drive assembly 3, a second chain drive assembly 4, and a third chain drive assembly 5; specifically, the first sprocket 1 has a first row of teeth 11 and a second row of teeth 12, the first sprocket 1 being for connection with an external crankshaft; the second sprocket 2 has a third row of teeth 21 and a fourth row of teeth 22; the first chain transmission assembly 3 includes an intake camshaft sprocket 31, an exhaust camshaft sprocket 32, and a first chain 33 wound around the intake camshaft sprocket 31, the exhaust camshaft sprocket 32, and the first row of teeth 11; the second chain drive assembly 4 includes a third sprocket 41 and a second chain 42 wound around the second row of teeth 12, the fourth row of teeth 22 and the third sprocket 41; the third chain transmission assembly 5 includes an oil pump sprocket 51, and a third chain 52 wound around the third row of teeth 21 and the oil pump sprocket 51, the first chain 33 and the third chain 52 being located on the same plane.
The first chain transmission assembly 3, the second chain transmission assembly 4 and the third chain transmission assembly 5 are respectively used for driving the intake camshaft sprocket 31, the exhaust camshaft sprocket 32, the third sprocket 41, the fourth row of teeth 22 and the oil pump sprocket 51, specifically, when the timing chain transmission system is installed on an engine, the first sprocket 1 is connected with a crankshaft, the intake camshaft sprocket 31 and the exhaust camshaft sprocket 32 are respectively connected with an intake camshaft and an exhaust camshaft, the oil pump sprocket 51 is connected with an oil pump, and at least one of the third sprocket 41 and the fourth row of teeth 22 is connected with a balance shaft in the balance shaft system, so that the timing chain transmission system has the function of driving external accessories such as an oil pump and the balance shaft system while having the function of engine timing.
The first chain 33 and the third chain 52 are arranged on the same plane through the first chain wheel 1 and the second chain wheel 2 with double rows of teeth, and even if the first chain 33 and the third chain 52 are arranged on the same layer along the axial direction, the three-layer transmission structure forms a two-layer transmission structure on the axial length, the axial direction size is reduced, the structure is compact, the axial space occupied by the engine is reduced, the engine structure is as compact as possible, the whole engine layout and the assembly are more convenient, and the production efficiency can be improved, and the production cost is reduced. And the balance shaft system and the oil pump are respectively driven by the second chain transmission assembly 4 and the third chain transmission assembly 5, the balance shaft system and the oil pump are mutually independent and do not interfere with each other, the degree of freedom of the whole engine arrangement is improved, and the third chain wheel 41 and the second chain wheel 2 can be respectively used for driving two balance shafts and do not interfere with each other.
In addition, the external crankshaft drives the first sprocket 1 to rotate, thereby driving the first chain 33, the intake camshaft sprocket 31, and the exhaust camshaft sprocket 32 to rotate; the crankshaft drives the camshaft through a layer of first chain 33, and timing accuracy is higher.
In this embodiment, the first chain 33 and the third chain 52 are located on one side of the second chain 42 facing away from the balance shaft system, and the first chain 33, the second chain 42 and the third chain 52 are all single-sided transmission chains, and in particular, the mute chain NVH can be applied. In other embodiments, the first chain 33 and the third chain 52 are located on the side of the second chain 42 facing the balance shaft system, which can be specifically set according to practical situations, and the axial space arrangement is more flexible.
Alternatively, as shown in fig. 4 and 5, the third sprocket 41 and the fourth row of teeth 22 have the same number of teeth, and when two balance shafts of the balance shaft system are simultaneously connected, the rotation speeds of the two balance shafts can be made the same; the gear ratio of the second row of teeth 12 to the fourth row of teeth 22 is 2:1 to reduce the rotation speed of the balance shaft, specifically, different gear numbers can be selected according to specific needs, and in other embodiments, different gear ratios can also be selected.
Alternatively, as shown in fig. 2 and 5, the gear ratio of the first row of teeth 11 to the second row of teeth 12 is 19:46, the gear ratios of the intake camshaft sprocket 31, the exhaust camshaft sprocket 32 and the first row of teeth 11 are 2:2:1, specifically, the gear numbers of the exhaust camshaft sprocket 32 of the intake camshaft sprocket 31 are 38, the gear ratio of the third row of teeth 21 to the fourth row of teeth 22 is 21:23, the gear ratio of the third row of teeth 21 to the oil pump sprocket 51 is 1:2, specifically, the gear number of the oil pump sprocket 51 is 42, and the above gear number distribution ensures that the meshing noise generated by a single sprocket does not overlap in the same order when the engine is running, and ensures that the noise is in a lower range.
Alternatively, the first sprocket 1, the second sprocket 2 and the third sprocket 41 are arranged in a triangle, the mutual distance is smaller, the overall rigidity of the chain is better, the transmission reliability is higher, and the first sprocket 1 is positioned in the area formed by the second sprocket 2, the third sprocket 41 and the oil pump sprocket 51, and the space structure in the height and width directions is compact.
In this embodiment, the external balance shaft system is provided with two balance shafts, and the fourth row of teeth 22 and the third sprocket 41 are respectively connected with the two balance shafts, so as to satisfy the use requirement of the four-cylinder machine. In other embodiments, when the external balance shaft system is provided with one balance shaft, such as a three-cylinder or six-cylinder engine, one of the fourth row of teeth 22 and the third sprocket 41 is an idler, and the other is used for connecting with the balance shaft, the balance shaft or the idler can be installed according to practical situations, so that the applicability is strong and the application range is wider.
Specifically, the arrangement positions of the second sprocket 2 and the third sprocket 41 are not limited, and as shown in fig. 5, in this embodiment, the second sprocket 2 is arranged on the right side of the first sprocket 1, the third chain 52 is driven by the second sprocket 2 and is also arranged on the right side of the first sprocket 1, and in other embodiments, the second sprocket 2 may be arranged on the left side of the first sprocket 1, and the third chain 52 is driven by the second sprocket 2 and is also arranged on the left side of the first sprocket 1.
Alternatively, as shown in fig. 5, the fourth row of teeth 22 and the third sprocket 41 are located on the side of the second row of teeth 12 near the intake camshaft sprocket 31 and the exhaust camshaft sprocket 32, enabling a reduction in the overall size and a reduction in the overall height of the engine. In other embodiments, the fourth row of teeth 22 and the third sprocket 41 are located on the side of the second row of teeth 12 facing away from the intake camshaft sprocket 31 and the exhaust camshaft sprocket 32, and specifically, the fourth row of teeth 22 and the third sprocket 41 can be flexibly adjusted according to the actual arrangement situation, which is not limited. Alternatively, as shown in fig. 5, the oil pump sprocket 51 may be disposed above or below the second sprocket 2, and may be flexibly adjusted according to practical situations, which is not limited.
Alternatively, as shown in fig. 4 and 5, the first, second and third chain drive assemblies 3, 4 and 5 include first, second and third tensioning assemblies 53, respectively, improving chain drive reliability.
Specifically, as shown in fig. 4 and fig. 5, the first tensioning assembly includes a first fixed guide rail 341 and a first movable guide rail 342 that are disposed on the outer side of the first chain 33 and are disposed at intervals, and further includes a first tensioner 343 that abuts against one side of the first movable guide rail 342 that faces away from the first chain 33, specifically, the first fixed guide rail 341 and the first movable guide rail 342 are disposed on two sides of the first chain 33 that are located on the first sprocket 1, and the first tensioner 343 abuts against the first movable guide rail 342, so that the first chain 33 is in a tight state, and the transmission reliability of the first chain 33 is improved; further, the fourth fixed rail 344 is provided on the first chain 33 between the intake camshaft sprocket 31 and the exhaust camshaft sprocket 32, so that the shake of the first chain 33 can be suppressed, and the first chain 33 can be prevented from jumping teeth. Further, the outer contact surface of the first fixed guide rail 341 has an arc, in this embodiment, the transmission ratio is 2:2:1, the transmission ratio is large, the radius of the arc is 1350mm, and the arc is large, which is beneficial to reducing friction loss. Alternatively, the first tensioner 343 is a hydraulic tensioner, and the tension can be increased due to the higher rotation speed of the first sprocket 1, so that the reliability is improved; specifically, the hydraulic tensioner may adopt an existing structure, and will not be described in detail.
Optionally, the second tensioning assembly includes a second fixed rail 431 and a second movable rail 432 disposed outside the second chain 42 and spaced apart, and a second tensioner 433 abutted against a side of the second movable rail 432 facing away from the second chain 42; specifically, the second fixed rail 431 and the second movable rail 432 are respectively arranged on two sides of the second chain 42 on the third sprocket 41, and the second tensioner 433 presses against the second movable rail 432, so that the second chain 42 is in a tightening state, and the transmission reliability of the second chain 42 is improved; further, a fifth fixed guide rail 434 is further arranged between the first sprocket 1 and the second sprocket 2, so that the shake of the second chain 42 can be restrained, and tooth jump can be prevented; further, the contact surface of the second fixed guide rail 431 has an arc, and the arc is 2500mm in size, so that the large arc is beneficial to reducing friction loss; because the gear ratio of the second row of teeth 12 to the third sprocket 41 is 2:1, i.e. the speed ratio is 1:2, the rotation speed of the third sprocket 41 is higher, the second tensioner 433 is a hydraulic tensioner, the tensioning force is increased, and the reliability is improved.
Optionally, the third tensioning assembly 53 includes a third fixed rail 531 and a third movable rail 532 that are disposed outside the third chain 52 and are disposed at intervals, and further includes a third tensioner 533 that abuts against one side of the third movable rail 532 that faces away from the third chain 52, where the third fixed rail 531 and the third movable rail 532 are disposed on two sides of the oil pump sprocket 51, respectively, and the third tensioner 533 abuts against the third movable rail 532, so that the third chain 52 is in a tight state, and transmission reliability of the third chain 52 is improved. Alternatively, the third tensioner 533 is a torsion spring type tensioner, and since the rotation speed of the oil pump sprocket 51 is low, the third tensioner 533 does not need to have too much tension; specifically, the torsion spring type tensioner may employ the prior art, and will not be described in detail. The outer contact surface of the third fixed guide rail 531 has an arc, the arc is 500mm, and friction loss can be reduced due to the fact that the arc is large.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A timing chain drive system, comprising:
a first sprocket (1) having a first row of teeth (11) and a second row of teeth (12), the first sprocket (1) being for connection to an external crankshaft;
a second sprocket (2) having a third row of teeth (21) and a fourth row of teeth (22);
a first chain transmission assembly (3) comprising an intake camshaft sprocket (31), an exhaust camshaft sprocket (32) and a first chain (33) wound around the intake camshaft sprocket (31), the exhaust camshaft sprocket (32) and the first row of teeth (11);
a second chain transmission assembly (4) comprising a third sprocket (41) and a second chain (42) wound around the second row of teeth (12), the fourth row of teeth (22) and the third sprocket (41);
the third chain transmission assembly (5) comprises an oil pump chain wheel (51) and a third chain (52) wound on the third row of teeth (21) and the oil pump chain wheel (51), and the first chain (33) and the third chain (52) are positioned on the same plane;
the first chain (33) and the third chain (52) are arranged on the same plane through the first chain wheel (1) and the second chain wheel (2) with double rows of teeth, namely, the first chain and the third chain are arranged on the same layer along the axial direction, so that a three-layer transmission structure forms a two-layer transmission structure along the axial length, and the axial direction size is reduced; the balance shaft system and the oil pump are driven by the second chain transmission assembly (4) and the third chain transmission assembly (5) respectively, and are mutually independent and do not interfere with each other, so that the degree of freedom of the whole engine arrangement is improved;
the first chain wheel (1), the second chain wheel (2) and the third chain wheel (41) are arranged in a triangle, and the first chain wheel (1) is positioned in an area formed by the second chain wheel (2), the third chain wheel (41) and the oil pump chain wheel (51);
when the external balance shaft system is provided with one balance shaft, one of the fourth row of teeth (22) and the third sprocket (41) is an idler wheel, the other is used for connecting with the balance shaft; or when the external balance shaft system is provided with two balance shafts, the fourth row of teeth (22) and the third sprocket (41) are respectively connected with the two balance shafts.
2. Timing chain drive system according to claim 1, characterized in that the first chain (33) and the third chain (52) are located on the side of the second chain (42) facing away from or towards where a balance shaft system is provided, and that the first chain (33), the second chain (42), the third chain (52) are all single-sided drive chains.
3. The timing chain drive system of claim 1 wherein the third sprocket (41) and the fourth row of teeth (22) have the same tooth count and the tooth ratio of the second row of teeth (12) to the fourth row of teeth (22) is 2:1.
4. The timing chain drive system of claim 1 wherein a tooth ratio of the first row of teeth (11) to the second row of teeth (12) is 19:46, a tooth ratio of the intake camshaft sprocket (31), the exhaust camshaft sprocket (32) to the first row of teeth (11) is 2:2:1, a tooth ratio of the third row of teeth (21) to the fourth row of teeth (22) is 21:23, and a tooth ratio of the third row of teeth (21) to the oil pump sprocket (51) is 1:2.
5. The timing chain drive system of claim 1 wherein the fourth row of teeth (22) and the third sprocket (41) are located on a side of the second row of teeth (12) adjacent the intake camshaft sprocket (31) and the exhaust camshaft sprocket (32).
6. Timing chain drive system according to any of claims 1-5, characterized in that the first chain drive assembly (3), the second chain drive assembly (4) and the third chain drive assembly (5) comprise a first tensioning assembly, a second tensioning assembly and a third tensioning assembly (53), respectively.
7. The timing chain drive system of claim 6 wherein the timing chain drive system comprises,
the first tensioning assembly comprises a first fixed guide rail (341) and a first movable guide rail (342) which are arranged outside the first chain (33) at intervals, and also comprises a first tensioner (343) which is propped against one side of the first movable guide rail (342) away from the first chain (33);
the second tensioning assembly comprises a second fixed guide rail (431) and a second movable guide rail (432) which are arranged outside the second chain (42) at intervals, and a second tensioner (433) which is propped against one side of the second movable guide rail (432) away from the second chain (42);
the third tensioning assembly (53) comprises a third fixed guide rail (531) and a third movable guide rail (532) which are arranged outside the third chain (52) at intervals, and a third tensioner (533) which abuts against one side of the third movable guide rail (532) away from the third chain (52).
8. The timing chain drive system of claim 7 wherein the first tensioner (343) and the second tensioner (433) are both hydraulic tensioners and the third tensioner (533) is a torsion spring tensioner.
9. The timing chain drive system of claim 7 wherein the outer contact surfaces of the first (341), second (431) and third (531) fixed rails each have an arc.
10. An engine comprising a crankshaft, an intake camshaft, an exhaust camshaft, an oil pump and a balance shaft system, and further comprising the timing chain transmission system according to any one of claims 1-9, wherein the first sprocket (1) is connected to the crankshaft, the intake camshaft sprocket (31) and the exhaust camshaft sprocket (32) are connected to the intake camshaft and the exhaust camshaft, respectively, the oil pump sprocket (51) is connected to the oil pump, and at least one of the third sprocket (41) and the fourth row of teeth (22) is connected to a balance shaft in the balance shaft system.
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| CN202210042484.0A CN114352374B (en) | 2022-01-14 | 2022-01-14 | Timing chain transmission system and engine |
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| CN202210042484.0A CN114352374B (en) | 2022-01-14 | 2022-01-14 | Timing chain transmission system and engine |
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| DE102004049030B4 (en) * | 2004-10-08 | 2008-09-11 | Audi Ag | Arrangement of a timing case cover |
| TWI453333B (en) * | 2011-12-23 | 2014-09-21 | Kwang Yang Motor Co | Vehicle unit of vehicle power unit |
| CN103790664B (en) * | 2014-02-25 | 2016-08-17 | 奇瑞汽车股份有限公司 | A kind of engine correct-timing drive system with double balance shaft |
| CN204492919U (en) * | 2015-03-26 | 2015-07-22 | 北京汽车动力总成有限公司 | A kind of motor |
| DE102017003390A1 (en) * | 2016-04-26 | 2017-10-26 | Ford Global Technologies, Llc | Gear driven diesel fuel injection pump of an engine |
| US10422253B2 (en) * | 2016-04-26 | 2019-09-24 | Ford Global Technologies, Llc | Cam drive system for an engine |
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2022
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