CN114352374A - Timing chain transmission system and engine - Google Patents
Timing chain transmission system and engine Download PDFInfo
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- CN114352374A CN114352374A CN202210042484.0A CN202210042484A CN114352374A CN 114352374 A CN114352374 A CN 114352374A CN 202210042484 A CN202210042484 A CN 202210042484A CN 114352374 A CN114352374 A CN 114352374A
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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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- Y02T10/12—Improving ICE efficiencies
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Abstract
The invention belongs to the technical field of engines, and discloses a timing chain transmission system and an engine, which comprise a first chain wheel with a first row of teeth and a second row of teeth, a second chain wheel 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, wherein the first chain transmission assembly comprises an air inlet camshaft chain wheel, an air outlet camshaft chain wheel and a first chain wound on the air inlet camshaft chain wheel, the air outlet camshaft chain wheel and the first row of teeth; the second chain transmission assembly comprises a third chain wheel and a second chain wound on the second row of teeth, the fourth row of teeth and the third chain wheel; 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. The invention reduces the size in the axial direction, 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, the timing chain drive system 100 is provided between the crankshaft and the camshaft for driving the crankshaft and the camshaft, respectively; an oil pump 200 for fuel supply is also provided in some engines, and the oil pump 200 is also driven by the timing chain transmission system 100. At present, along with the increasingly high requirements of the market on the performance of NVH (Noise, Vibration and Harshness), a balance shaft system is further arranged in the engine, the balance shaft system improves Vibration by being provided with a balance shaft, the Noise of the engine can be obviously reduced, the driving feeling is improved, 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 a front end of the right balance shaft 300 to rotate, the left balance shaft 400 and the right balance shaft 300 are driven by a gear, a rear end of the left balance shaft 400 drives an oil pump 200, and the balance shaft system is disposed between the oil pump 200 and the timing chain transmission system 100, so that an axial direction between the oil pump 200 and the timing chain transmission system 100 is large in size, and occupies a larger axial space of an engine, thereby causing problems of difficulty in overall arrangement, complex assembly process, low production efficiency, and the like.
Disclosure of Invention
The invention aims to provide a timing chain transmission system and an engine, which reduce the size in the axial direction, have compact structure, reduce the occupation of the axial space of the engine, reduce the assembly difficulty by using the arrangement of the whole engine and improve the production efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, a timing chain drive system is provided, 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 camshaft chain wheel, an air outlet camshaft chain wheel and a first chain wound on the air inlet camshaft chain wheel, the air outlet camshaft chain wheel and the first row of teeth;
the second chain transmission assembly comprises a third chain wheel and a second chain wound on the second row of teeth, the fourth row of teeth and the third chain wheel;
and 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 on a side of the second chain that is away from or faces 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 gear ratio of the second row of teeth to the fourth row of teeth is 2: 1.
Optionally, a gear ratio of the first row of teeth to the second row of teeth is 19:46, a gear ratio of the intake camshaft sprocket, the exhaust camshaft sprocket and the first row of teeth is 2:2:1, a gear ratio of the third row of teeth to the fourth row of teeth is 21:23, and a 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 in 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 that is adjacent to the intake camshaft sprocket and the exhaust camshaft sprocket.
Optionally, when the outer balance shaft system is provided with one balance shaft, one of the fourth row of teeth and the third sprocket is an idler, and 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 and the third chain wheel are respectively connected with the two balance shafts.
Optionally, the first, second and third chain drive assemblies comprise first, second and third tensioner assemblies, respectively.
Optionally, the first tensioning assembly includes a first fixed guide rail and a first movable guide rail which are arranged outside the first chain and are arranged at intervals, and further includes a first tensioner which abuts against a side of the first movable guide rail, which faces 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 abutted against one side of the second movable guide rail, which is deviated from the second chain;
the third tensioning assembly comprises a third fixed guide rail and a third movable guide rail which are arranged outside the third chain at intervals, and a third tensioner which is abutted against one side of the third movable guide rail departing from the third chain.
Optionally, the first and second tensioners are both hydraulic tensioners and the third tensioner is a torsion spring tensioner.
Optionally, the outer contact surfaces of the first fixed rail, the second fixed rail and the third fixed rail all have a curvature.
On the other hand, the engine comprises a crankshaft, an air inlet camshaft, an air outlet camshaft, an oil pump, a balance shaft system and the timing chain transmission system, wherein a first chain wheel is connected with the crankshaft, an air inlet camshaft chain wheel and an air outlet camshaft chain wheel are respectively connected with the air inlet camshaft and the air outlet camshaft, an oil pump chain wheel is connected with the oil pump, and at least one of a third chain wheel and a fourth row of teeth is connected with a 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 camshaft chain wheel, an air outlet camshaft chain wheel, a third chain wheel, a fourth row of teeth and an oil pump chain wheel.
The first chain and the second chain are arranged on the same plane through the first chain wheel and the second chain wheel which are provided with the double rows of teeth, even if the first chain and the second chain are arranged on the same layer along the axial direction, the three-layer transmission structure forms a two-layer transmission structure from the axial length, the size of the axial direction is reduced, the structure is compact, the occupied axial space of an engine is reduced, the structure of the engine is compact as much as possible, the overall layout, the assembly and the like of the engine are more convenient, and the production efficiency and the production cost are improved. 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 independent from each other and do not interfere with each other, the degree of freedom of arrangement of the whole engine 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 structural view of a first sprocket provided in accordance with an embodiment of the present invention;
FIG. 3 is a schematic structural view of a second sprocket provided in accordance with an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a timing chain drive system provided by an embodiment of the present invention;
FIG. 5 is a front view of a timing chain drive system provided by 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 guide 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 guide rail; 433. a second tensioner; 434. a fifth fixed guide rail;
5. a third chain drive assembly; 51. oil pump chain wheels; 52. a third chain; 53. a third tensioning assembly; 531. a third fixed guide rail; 532. a third movable guide rail; 533. a third tensioner.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, 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 a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The embodiment provides an engine, which comprises a crankshaft, an air inlet camshaft, an exhaust camshaft, an oil pump, a balance shaft system and a timing chain transmission system, wherein the balance shaft system is arranged to improve vibration and noise, vibration and harshness (NVH) performance. 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; in particular, the first sprocket 1 has a first row of teeth 11 and a second row of teeth 12, the first sprocket 1 being intended to be connected to 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 comprises an inlet camshaft chain wheel 31, an outlet camshaft chain wheel 32 and a first chain 33 wound on the inlet camshaft chain wheel 31, the outlet camshaft chain wheel 32 and the first row of teeth 11; the second chain transmission assembly 4 comprises a third chain wheel 41 and a second chain 42 wound around the second row of teeth 12, the fourth row of teeth 22 and the third chain wheel 41; the third chain drive assembly 5 comprises an oil pump chain wheel 51 and a third chain 52 wound around the third row of teeth 21 and the oil pump chain wheel 51, and the first chain 33 and the third chain 52 are 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 an intake camshaft chain wheel 31, an exhaust camshaft chain wheel 32, a third chain wheel 41, a fourth row of teeth 22 and an oil pump chain wheel 51, specifically, when the timing chain transmission system is installed on an engine, the first chain wheel 1 is connected with a crankshaft, the intake camshaft chain wheel 31 and the exhaust camshaft chain wheel 32 are respectively connected with an intake camshaft and an exhaust camshaft, the oil pump chain wheel 51 is connected with an oil pump, and at least one of the third chain wheel 41 and the fourth row of teeth 22 is connected with a balance shaft in a balance shaft system, so that the timing chain transmission system has the engine timing function and also has the functions of external accessories such as a driver oil pump and the balance shaft system.
The first chain 33 and the second chain 42 are arranged on the same plane through the first chain wheel 1 and the second chain wheel 2 with the double rows of teeth, even if the first chain wheel and the second chain wheel are arranged on the same layer along the axial direction, so that the three-layer transmission structure forms a two-layer transmission structure from the axial length, the size in the axial direction is reduced, the structure is compact, the axial space occupied by the engine is reduced, the structure is beneficial to being compact as much as possible, the overall layout, assembly and the like of the engine are more convenient, and the production efficiency can be improved and the production cost can be 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 the two balance shafts and do not interfere with each other.
In addition, the external crankshaft drives the first chain wheel 1 to rotate, so as to drive the first chain 33, the intake camshaft chain wheel 31 and the exhaust camshaft chain wheel 32 to rotate; the crankshaft drives the camshaft through a layer of the first chain 33, and the timing precision is higher.
In this embodiment, the first chain 33 and the third chain 52 are located on the side of the second chain 42 away from the side where the balance shaft system is provided, and the first chain 33, the second chain 42, and the third chain 52 are all single-sided transmission chains, and specifically, a silent 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 may be set according to actual conditions, and the axial spatial 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 connected at the same time, the rotation speeds of the two balance shafts can be made the same; and the gear ratio of the second row of teeth 12 to the fourth row of teeth 22 is 2:1, so as 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 transmission 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 ratio of the intake camshaft sprocket 31, the exhaust camshaft sprocket 32 to the first row of teeth 11 is 2:2:1, specifically, the number of teeth of the exhaust camshaft sprocket 32 of the intake camshaft sprocket 31 is 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 number of teeth of the oil pump sprocket 51 is 42, and by the above gear ratio, when the engine operates, meshing noise generated by a single sprocket does not overlap in the same order, and the noise is ensured to be in a lower range.
Optionally, the first sprocket 1, the second sprocket 2 and the third sprocket 41 are arranged in a triangular shape, the mutual distance is small, the overall rigidity of the chain is better, the transmission reliability is higher, the first sprocket 1 is located in an area formed by the second sprocket 2, the third sprocket 41 and the oil pump sprocket 51, and the space structure in the height direction and the width direction 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 chain wheel 41 are respectively connected with the two balance shafts, so that the use requirement of the four-cylinder machine can be met. 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 actual conditions, and the applicability is strong and the application range is wider.
Specifically, the positions of the second sprocket 2 and the third sprocket 41 are not limited, and as shown in fig. 5, in the present embodiment, the second sprocket 2 is disposed on the right side of the first sprocket 1, and the third chain 52 is driven by the second sprocket 2 and also disposed on the right side of the first sprocket 1, and in other embodiments, the second sprocket 2 may be disposed on the left side of the first sprocket 1, and the third chain 52 is driven by the second sprocket 2 and also disposed 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 close to the intake camshaft sprocket 31 and the exhaust camshaft sprocket 32, which can reduce the overall size and 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 away from the intake camshaft sprocket 31 and the exhaust camshaft sprocket 32, and can be flexibly adjusted according to actual arrangement conditions, 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 actual conditions, without limitation.
Alternatively, as shown in fig. 4 and 5, the first, second and third chain drive assemblies 3, 4, 5 include first, second and third tensioner assemblies 53, respectively, improving chain drive reliability.
Specifically, as shown in fig. 4 and 5, the first tensioning assembly includes a first fixed rail 341 and a first movable rail 342 that are disposed outside the first chain 33 and are disposed at an interval, and further includes a first tensioner 343 that abuts against a side of the first movable rail 342 that is away from the first chain 33, specifically, the first fixed rail 341 and the first movable rail 342 are disposed on two sides of the first chain 33 on the first sprocket 1, respectively, and the first tensioner 343 abuts against the first movable rail 342 to make the first chain 33 in a tensioned state, thereby improving the transmission reliability of the first chain 33; further, the fourth fixed guide 344 is provided on the first chain 33 between the intake camshaft sprocket 31 and the exhaust camshaft sprocket 32, and thus, the first chain 33 is prevented from being shaken and the first chain 33 is prevented from jumping. Further, the outer contact surface of the first fixed guide rail 341 has a radian, in this embodiment, the transmission ratio is 2:2:1, the transmission ratio is large, the radius of the radian is 1350mm, and the radian is large, which is beneficial to reducing the friction loss. Optionally, the first tensioner 343 is a hydraulic tensioner, and since the first sprocket 1 rotates at a higher speed, the tension can be increased, and the reliability is improved; specifically, the hydraulic tensioner may adopt an existing structure, and the description thereof is omitted.
Optionally, the second tensioning assembly includes a second fixed rail 431 and a second movable rail 432 which are arranged outside the second chain 42 and are arranged at intervals, and further includes a second tensioner 433 which abuts 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 the second chain 42 at two sides of the third sprocket 41, and the second tensioner 433 tightly pushes the second movable rail 432, so that the second chain 42 is in a tightened state, and the transmission reliability of the second chain 42 is improved; further, a fifth fixed guide rail 434 is provided between the first sprocket 1 and the second sprocket 2, which can suppress the second chain 42 from wobbling and prevent tooth jumping; further, the contact surface of the second fixed guide rail 431 has a radian, the size of the radian is 2500mm, and the radian is large, so that the friction loss is favorably reduced; the gear ratio of the second row of teeth 12 to the third chain wheel 41 is 2:1, namely the gear ratio is 1:2, the rotating speed of the third chain wheel 41 is high, and the second tensioner 433 is a hydraulic tensioner, so that the tensioning force is increased, and the reliability is improved.
Optionally, the third tensioning assembly 53 includes a third fixed guide 531 and a third movable guide 532 which are disposed outside the third chain 52 and are disposed at an interval, and further includes a third tensioner 533 which abuts against a side of the third movable guide 532 away from the third chain 52, the third fixed guide 531 and the third movable guide 532 are respectively disposed on two sides of the oil pump sprocket 51, and the third tensioner 533 tightly abuts against the third movable guide 532, so that the third chain 52 is in a tightened state, and the transmission reliability of the third chain 52 is improved. Alternatively, the third tensioner 533 is a torsion spring type tensioner, and since the oil pump sprocket 51 rotates at a lower speed, the third tensioner 533 does not need to have too large a tension; specifically, the torsion spring tensioner can be used in the prior art and is not described in detail. The outer contact surface of the third fixed guide rail 531 has a radian, the radian is 500mm, and the radian is large so as to reduce the friction loss.
It should be understood that the above-described embodiments of the present invention are merely 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.
Claims (12)
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 with an external crankshaft;
a second sprocket (2) having a third row of teeth (21) and a fourth row of teeth (22);
the first chain transmission assembly (3) comprises an air inlet camshaft chain wheel (31), an air outlet camshaft chain wheel (32) and a first chain (33) wound on the air inlet camshaft chain wheel (31), the air outlet camshaft chain wheel (32) and the first row of teeth (11);
a second chain transmission assembly (4) comprising a third chain wheel (41) and a second chain (42) wound around the second row of teeth (12), the fourth row of teeth (22) and the third chain wheel (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 located on the same plane.
2. A timing chain transmission system according to claim 1, characterized in that the first chain (33) and the third chain (52) are located at a side of the second chain (42) facing away from or towards a system of balance shafts, and that the first chain (33), the second chain (42) and the third chain (52) are all single-sided transmission chains.
3. The timing chain transmission system according to claim 1, wherein the third sprocket (41) and the fourth row of teeth (22) have the same number of teeth, and the gear ratio of the second row of teeth (12) to the fourth row of teeth (22) is 2: 1.
4. The timing chain transmission system according to claim 1, wherein a gear ratio of the first row of teeth (11) to the second row of teeth (12) is 19:46, a gear ratio of the intake camshaft sprocket (31), the exhaust camshaft sprocket (32) to the first row of teeth (11) is 2:2:1, a gear ratio of the third row of teeth (21) to the fourth row of teeth (22) is 21:23, and a gear ratio of the third row of teeth (21) to the oil pump sprocket (51) is 1: 2.
5. The timing chain drive system according to claim 1, characterized in that the first sprocket (1), the second sprocket (2) and the third sprocket (41) are arranged in a triangle, and the first sprocket (1) is located within an area formed by the second sprocket (2), the third sprocket (41) and the oil pump sprocket (51).
6. The timing chain drive system according to 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 to the intake camshaft sprocket (31) and the exhaust camshaft sprocket (32).
7. The timing chain drive system according to claim 1,
when the external balance shaft system is provided with a balance shaft, one of the fourth row of teeth (22) and the third chain wheel (41) is an idler wheel, and the other one 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 chain wheel (41) are respectively connected with the two balance shafts.
8. Timing chain drive system according to any of claims 1-7, characterized in that the first (3), second (4) and third (5) chain drive assemblies comprise a first, second and third tensioning assembly (53), respectively.
9. The timing chain drive system according to claim 8,
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 a first tensioner (343) which abuts against one side, away from the first chain (33), of the first movable guide rail (342);
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 abutted against one side of the second movable guide rail (432) facing 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 further comprises a third tensioner (533) which is abutted against one side of the third movable guide rail (532) facing away from the third chain (52).
10. A timing chain transmission system according to claim 9, characterized in that said first tensioner (343) and said second tensioner (433) are both hydraulic tensioners and said third tensioner (533) is a torsion spring tensioner.
11. The timing chain transmission system according to claim 9, wherein outer contact surfaces of the first fixed rail (341), the second fixed rail (431), and the third fixed rail (531) each have an arc.
12. An engine comprising a crankshaft, an intake camshaft, an exhaust camshaft, an oil pump and a balance shaft system, and further comprising a timing chain drive system according to any of claims 1 to 11, 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114856806A (en) * | 2022-05-24 | 2022-08-05 | 中国第一汽车股份有限公司 | Engine chain drive system |
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| CN107435566A (en) * | 2016-04-26 | 2017-12-05 | 福特环球技术公司 | Cam driving system for engine |
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2022
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Cited By (2)
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| CN114856806A (en) * | 2022-05-24 | 2022-08-05 | 中国第一汽车股份有限公司 | Engine chain drive system |
| CN114856806B (en) * | 2022-05-24 | 2023-08-11 | 中国第一汽车股份有限公司 | Engine chain driving system |
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| Publication number | Publication date |
|---|---|
| CN114352374B (en) | 2023-06-16 |
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