Transmission mechanism and engine

Abstract

The transmission mechanism and the engine are suitable for the engine, the engine comprises a crankshaft, an air inlet cam shaft, an exhaust cam shaft, an air inlet side balance shaft, an exhaust side balance shaft, an oil injection pump, a vacuum pump and an oil pump assembly, and the transmission mechanism comprises a first chain transmission assembly, a second chain transmission assembly and a third chain transmission assembly. A plurality of chain wheels are arranged in each chain transmission assembly, so that the purpose of transmission among a crankshaft, an air inlet cam shaft, an air outlet cam shaft, an air inlet side balance shaft, an air outlet side balance shaft, an oil injection pump, a vacuum pump, an oil pump assembly and the like is achieved, and the problems that in the prior art, an engine transmission mechanism is complex in structure and high in cost are solved. The manufacturing cost and the maintenance difficulty are increased, the overall layout is not compact enough, and the required installation space is large.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a transmission mechanism and an engine. Background Art

[0002] The engine transmission mechanism is a key component of the engine power system, which is responsible for transmitting the rotational motion generated by the engine to the outside, thereby realizing the movement of the vehicle.

[0003] The transmission mode of the prior art engine transmission mechanism currently has some problems, such as the structure of the engine transmission mechanism is relatively complex, which increases the manufacturing cost and maintenance difficulty, and the overall layout is not compact enough, and the required installation space is large. In addition, due to the complexity of the transmission mechanism, the vibration and noise of the engine are large, and the service life is short. Utility Model Content

[0004] The main purpose of the utility model is to provide a transmission mechanism and an engine to solve the problems in the prior art that the engine transmission mechanism has a relatively complex structure, increases manufacturing cost and maintenance difficulty, and the overall layout is not compact enough and requires a large installation space.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the utility model, a transmission mechanism is provided, which is applicable to an engine, including a crankshaft, an intake camshaft, an exhaust camshaft, an intake side balance shaft, an exhaust side balance shaft, a fuel injection pump, a vacuum pump and an oil pump assembly, and the transmission mechanism includes: a first chain transmission assembly, a first one of the multiple sprockets of the first chain transmission assembly is sleeved on the crankshaft to rotate with the crankshaft and is transmission-connected to both the intake side balance shaft and the exhaust side balance shaft to drive the intake side balance shaft and the exhaust side balance shaft to rotate, a second one of the multiple sprockets of the first chain transmission assembly is sleeved on the fuel injection pump input shaft of the fuel injection pump to drive the fuel injection pump input shaft to rotate; A chain drive assembly, a first one of the multiple sprockets of the second chain drive assembly is coaxially arranged with a third one of the multiple sprockets of the first chain drive assembly to rotate synchronously, a second one of the multiple sprockets of the second chain drive assembly is sleeved on the intake camshaft to drive the intake camshaft to rotate, and a third one of the multiple sprockets of the second chain drive assembly is sleeved on the exhaust camshaft to drive the exhaust camshaft to rotate; a third chain drive assembly, a first one of the multiple sprockets of the third chain drive assembly is sleeved on the crankshaft to rotate with the crankshaft, and a second one of the multiple sprockets of the third chain drive assembly is sleeved on the assembly input shaft of the vacuum pump and oil pump assembly to drive the assembly input shaft to rotate.

[0006] Furthermore, the first chain transmission assembly includes: a first chain, a first crankshaft sprocket, a fuel injection pump sprocket and a first driving sprocket, the first crankshaft sprocket, the fuel injection pump sprocket and the first driving sprocket are arranged at intervals, the first chain is sleeved outside the first crankshaft sprocket, the fuel injection pump sprocket and the first driving sprocket and is meshed with the first crankshaft sprocket, the fuel injection pump sprocket and the first driving sprocket; wherein the first crankshaft sprocket is sleeved on the crankshaft to rotate with the crankshaft and is transmission-connected to the intake side balance shaft and the exhaust side balance shaft to drive the intake side balance shaft and the exhaust side balance shaft to rotate, the fuel injection pump sprocket is sleeved on the fuel injection pump input shaft of the fuel pump to drive the fuel injection pump input shaft to rotate, and the first driving sprocket is coaxially arranged with the first of the multiple sprockets of the second chain transmission assembly to rotate synchronously.

[0007] Furthermore, the first chain drive assembly also includes: a first guide rail, the first guide rail is arranged on the outside of the portion of the first chain located at the first crankshaft sprocket and the injection pump sprocket and abuts against the first chain; a second guide rail, the second guide rail is arranged on the outside of the portion of the first chain located at the injection pump sprocket and the first drive sprocket and abuts against the first chain; a third guide rail, the third guide rail is arranged on the outside of the portion of the first chain located at the first crankshaft sprocket and the first drive sprocket and abuts against the first chain; a first hydraulic tensioner, the first hydraulic tensioner is connected to the third guide rail to drive the third guide rail to move in a direction close to or away from the first chain to adjust the tension of the first chain.

[0008] Furthermore, the transmission mechanism includes: a balance shaft drive gear, which is coaxially arranged with the first crankshaft sprocket to rotate synchronously with the first crankshaft sprocket; an intake side balance shaft gear, which is meshed with the balance shaft drive gear and is sleeved on the intake side balance shaft to drive the intake side balance shaft to rotate.

[0009] Furthermore, the transmission mechanism also includes: an exhaust side balance shaft gear, which is sleeved on the exhaust side balance shaft to drive the exhaust side balance shaft to rotate; a balance shaft intermediate gear, which is rotatably arranged on the first guide rail, and the balance shaft intermediate gear is located between the balance shaft drive gear and the exhaust side balance shaft gear and is meshed with the balance shaft drive gear and the exhaust side balance shaft gear, and the balance shaft drive gear drives the exhaust side balance shaft gear to rotate via the balance shaft intermediate gear.

[0010] Furthermore, the second chain transmission assembly includes: a second chain, a second drive sprocket, an intake camshaft sprocket and an exhaust camshaft sprocket, the second drive sprocket, the intake camshaft sprocket and the exhaust camshaft sprocket are arranged at intervals, the second chain is sleeved outside the second drive sprocket, the intake camshaft sprocket and the exhaust camshaft sprocket and is meshed with the second drive sprocket, the intake camshaft sprocket and the exhaust camshaft sprocket; the second drive sprocket is coaxially arranged with the third one of the multiple sprockets of the first chain transmission assembly to rotate synchronously, the intake camshaft sprocket is sleeved on the intake camshaft to drive the intake camshaft to rotate, and the exhaust camshaft sprocket is sleeved on the exhaust camshaft to drive the exhaust camshaft to rotate.

[0011] Furthermore, the second chain transmission assembly also includes: a fourth guide rail, which is arranged on the outside of the portion of the second chain located at the second drive sprocket and the intake camshaft sprocket and abuts against the second chain; a fifth guide rail, which is arranged on the outside of the portion of the second chain located at the intake camshaft sprocket and the exhaust camshaft sprocket and abuts against the second chain; a sixth guide rail, which is arranged on the outside of the portion of the second chain located at the second drive sprocket and the exhaust camshaft sprocket and abuts against the second chain; a second hydraulic tensioner, which is connected to the fourth guide rail to drive the fourth guide rail to move in a direction close to or away from the second chain to adjust the tension of the second chain.

[0012] Furthermore, the third chain transmission assembly includes: a third chain, a second crankshaft sprocket and an oil pump sprocket, the second crankshaft sprocket and the oil pump sprocket are arranged at an interval, the third chain is arranged outside the second crankshaft sprocket and the oil pump sprocket and is meshed with the second crankshaft sprocket and the oil pump sprocket; wherein the second crankshaft sprocket is arranged on the crankshaft to rotate with the crankshaft, and the oil pump sprocket is arranged on the assembly input shaft of the vacuum pump and the oil pump assembly to drive the assembly input shaft to rotate.

[0013] Furthermore, the third chain transmission assembly also includes a tensioning rail, which is arranged on the outside of the third chain and abuts against the third chain to tension the third chain.

[0014] Furthermore, according to another aspect of the utility model, an engine is provided, including a crankshaft, an intake camshaft, an exhaust camshaft, an intake side balance shaft, an exhaust side balance shaft, a fuel injection pump, a vacuum pump and an oil pump assembly, and the crankshaft is transmission-connected to the intake camshaft, the exhaust camshaft, the intake side balance shaft, the exhaust side balance shaft, the fuel injection pump, the vacuum pump and the oil pump assembly through a transmission mechanism.

[0015] The technical solution of the utility model is applied, and the transmission mechanism of the utility model is suitable for an engine, including a crankshaft, an intake camshaft, an exhaust camshaft, an intake side balance shaft, an exhaust side balance shaft, an injection pump, a vacuum pump and an oil pump assembly, and the transmission mechanism includes: a first chain transmission assembly, a first one of the multiple sprockets of the first chain transmission assembly is sleeved on the crankshaft to rotate with the crankshaft and is transmission-connected with both the intake side balance shaft and the exhaust side balance shaft to drive the intake side balance shaft and the exhaust side balance shaft to rotate, a second one of the multiple sprockets of the first chain transmission assembly is sleeved on the injection pump input shaft of the injection pump to drive the injection pump input shaft to rotate; a second chain transmission assembly The first of the multiple sprockets of the second chain drive assembly is coaxially arranged with the third of the multiple sprockets of the first chain drive assembly to rotate synchronously, the second of the multiple sprockets of the second chain drive assembly is sleeved on the intake camshaft to drive the intake camshaft to rotate, and the third of the multiple sprockets of the second chain drive assembly is sleeved on the exhaust camshaft to drive the exhaust camshaft to rotate; the third chain drive assembly, the first of the multiple sprockets of the third chain drive assembly is sleeved on the crankshaft to rotate with the crankshaft, and the second of the multiple sprockets of the third chain drive assembly is sleeved on the assembly input shaft of the vacuum pump and oil pump assembly to drive the assembly input shaft to rotate. In this way, the transmission mechanism of the utility model realizes the transmission between the crankshaft and the intake camshaft, the exhaust camshaft, the intake side balance shaft, the exhaust side balance shaft, the fuel injection pump and the vacuum pump and the oil pump assembly by setting a first chain transmission assembly, a second chain transmission assembly and a third chain transmission assembly with compact structure and excellent performance, thereby improving the transmission efficiency of the engine, reducing the vibration and noise of the engine, increasing the service life of the engine, reducing the manufacturing cost and maintenance difficulty of the engine, and reducing the installation space required for the engine, effectively solving the problems in the prior art that the engine transmission mechanism has a relatively complex structure, increased manufacturing cost and maintenance difficulty, and the overall layout is not compact enough and the required installation space is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic structural diagram of a transmission mechanism according to an embodiment of the utility model in one direction when a crankshaft, a camshaft assembly and a balance shaft assembly are installed is shown;

[0018] Figure 2 Shows Figure 1 A schematic diagram of the structure of the transmission mechanism shown in another direction;

[0019] Figure 3 Shows Figure 1The schematic diagram of the structure of the transmission mechanism shown in the first direction when the crankshaft and camshaft assembly are not installed;

[0020] Figure 4 Shows Figure 3 A schematic structural diagram of the transmission mechanism shown in the second direction;

[0021] Figure 5 Shows Figure 3 The schematic diagram of the structure of the transmission mechanism shown in the third direction;

[0022] Figure 6 Shows Figure 3 The structure schematic diagram of the transmission mechanism shown in the fourth direction.

[0023] The above drawings include the following reference numerals:

[0024] 100. Crankshaft;

[0025] 200, camshaft assembly; 210, intake camshaft; 220, exhaust camshaft;

[0026] 300, balance shaft assembly; 310, intake side balance shaft; 311, intake side support bearing; 320, exhaust side balance shaft; 321, exhaust side support bearing;

[0027] 400, fuel injection nozzle;

[0028] 10. First chain drive assembly; 11. First chain; 12. First crankshaft sprocket; 13. First drive sprocket; 14. Fuel injection pump sprocket; 15. First guide rail; 16. Second guide rail; 17. Third guide rail; 18. First hydraulic tensioner;

[0029] 20. Second chain drive assembly; 21. Second chain; 22. Second drive sprocket; 23. Intake camshaft sprocket; 24. Exhaust camshaft sprocket; 25. Fourth guide rail; 26. Fifth guide rail; 27. Sixth guide rail; 28. Second hydraulic tensioner;

[0030] 30. Third chain drive assembly; 31. Third chain; 32. Second crankshaft sprocket; 33. Oil pump sprocket; 34. Tensioning guide rail;

[0031] 40. Balance shaft drive assembly; 41. Balance shaft drive gear; 42. Intake side balance shaft gear; 43. Exhaust side balance shaft gear; 44. Balance shaft intermediate gear. DETAILED DESCRIPTION

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] like Figures 1 to 6 As shown, the utility model provides a transmission mechanism, which is suitable for an engine. The engine includes a crankshaft 100, an intake camshaft 210, an exhaust camshaft 220, an intake side balance shaft 310, an exhaust side balance shaft 320, a fuel injection pump, a vacuum pump and an oil pump assembly. The transmission mechanism includes: a first chain transmission assembly 10, a first one of the multiple sprockets of the first chain transmission assembly 10 is sleeved on the crankshaft 100 to rotate with the crankshaft 100 and is transmission-connected to both the intake side balance shaft 310 and the exhaust side balance shaft 320 to drive the intake side balance shaft 310 and the exhaust side balance shaft 320 to rotate, a second one of the multiple sprockets of the first chain transmission assembly 10 is sleeved on the fuel injection pump input shaft of the fuel injection pump to drive the fuel injection pump input shaft to rotate; a second chain transmission assembly 10 includes a plurality of sprockets, each of which is sleeved on the crankshaft 100 to rotate with the crankshaft 100 and is transmission-connected to both the intake side balance shaft 310 and the exhaust side balance shaft 320 to drive the intake side balance shaft 310 and the exhaust side balance shaft 320 to rotate, and a second one of the plurality of sprockets of the first chain transmission assembly 10 is sleeved on the fuel injection pump input shaft of the fuel injection pump to drive the fuel injection pump input shaft to rotate; Component 20, the first of the multiple sprockets of the second chain drive component 20 is coaxially arranged with the third of the multiple sprockets of the first chain drive component 10 to rotate synchronously, the second of the multiple sprockets of the second chain drive component 20 is sleeved on the intake camshaft 210 to drive the intake camshaft 210 to rotate, and the third of the multiple sprockets of the second chain drive component 20 is sleeved on the exhaust camshaft 220 to drive the exhaust camshaft 220 to rotate; the third chain drive component 30, the first of the multiple sprockets of the third chain drive component 30 is sleeved on the crankshaft 100 to rotate with the crankshaft 100, and the second of the multiple sprockets of the third chain drive component 30 is sleeved on the assembly input shaft of the vacuum pump and oil pump assembly to drive the assembly input shaft to rotate.

[0034] In this way, the transmission mechanism of the utility model realizes the transmission between the crankshaft 100 and the intake camshaft 210, the exhaust camshaft 220, the intake side balance shaft 310, the exhaust side balance shaft 320, the injection pump and the vacuum pump and the oil pump assembly by setting the first chain transmission assembly 10, the second chain transmission assembly 20 and the third chain transmission assembly 30 with compact structure and excellent performance, thereby improving the transmission efficiency of the engine, reducing the vibration and noise of the engine, increasing the service life of the engine, reducing the manufacturing cost and maintenance difficulty of the engine, and reducing the installation space required for the engine, thereby effectively solving the problems in the prior art that the engine transmission mechanism has a relatively complex structure, increased manufacturing cost and maintenance difficulty, and the overall layout is not compact enough and the required installation space is large.

[0035] like Figures 3 to 6As shown, the first chain transmission assembly 10 includes: a first chain 11, a first crankshaft sprocket 12, a fuel injection pump sprocket 14 and a first driving sprocket 13, the first crankshaft sprocket 12, the fuel injection pump sprocket 14 and the first driving sprocket 13 are arranged at intervals, the first chain 11 is sleeved outside the first crankshaft sprocket 12, the fuel injection pump sprocket 14 and the first driving sprocket 13 and is meshed with the first crankshaft sprocket 12, the fuel injection pump sprocket 14 and the first driving sprocket 13; wherein the first crankshaft sprocket 12 is sleeved on the crankshaft 100 to rotate with the crankshaft 100 and is transmission-connected with the intake side balance shaft 310 and the exhaust side balance shaft 320 to drive the intake side balance shaft 310 and the exhaust side balance shaft 320 to rotate, the fuel injection pump sprocket 14 is sleeved on the fuel injection pump input shaft of the fuel injection pump to drive the fuel injection pump input shaft to rotate, and the first driving sprocket 13 is coaxially arranged with the first of the multiple sprockets of the second chain transmission assembly 20 to rotate synchronously.

[0036] like Figures 3 to 6 As shown, the first chain transmission assembly 10 also includes: a first guide rail 15, which is arranged on the outside of the portion of the first chain 11 located at the first crankshaft sprocket 12 and the injection pump sprocket 14 and abuts against the first chain 11; a second guide rail 16, which is arranged on the outside of the portion of the first chain 11 located at the injection pump sprocket 14 and the first drive sprocket 13 and abuts against the first chain 11; a third guide rail 17, which is arranged on the outside of the portion of the first chain 11 located at the first crankshaft sprocket 12 and the first drive sprocket 13 and abuts against the first chain 11; a first hydraulic tensioner 18, which is connected to the third guide rail 17 to drive the third guide rail 17 to move in a direction close to or away from the first chain 11 to adjust the tension of the first chain 11.

[0037] like Figures 3 to 6 As shown, the first chain drive assembly 10 drives the third guide rail 17 to move to tension the first chain 11 by setting a first hydraulic tensioner 18, which can reduce the swing amplitude of the first chain 11 and improve the reliability of the movement of the first chain 11; in addition, the transmission mechanism of the utility model sets a high-pressure oil nozzle 400 at the first guide rail 15 to perform high-pressure injection lubrication on the first chain 11 at the first guide rail 15, which can further improve the reliability of the operation of the first chain 11 and reduce the risk of howling of the first chain 11.

[0038] like Figures 3 to 6 As shown, the transmission mechanism includes: a balance shaft driving gear 41, which is coaxially arranged with the first crankshaft sprocket 12 to rotate synchronously with the first crankshaft sprocket 12; an intake side balance shaft gear 42, which is meshed with the balance shaft driving gear 41 and is sleeved on the intake side balance shaft 310 to drive the intake side balance shaft 310 to rotate.

[0039] like Figures 3 to 6 As shown, the transmission mechanism also includes: an exhaust side balance shaft gear 43, which is sleeved on the exhaust side balance shaft 320 to drive the exhaust side balance shaft 320 to rotate; a balance shaft intermediate gear 44, which is rotatably arranged on the first guide rail 15, and the balance shaft intermediate gear 44 is located between the balance shaft driving gear 41 and the exhaust side balance shaft gear 43 and is meshed with the balance shaft driving gear 41 and the exhaust side balance shaft gear 43. The balance shaft driving gear 41 drives the exhaust side balance shaft gear 43 to rotate through the balance shaft intermediate gear 44.

[0040] Specifically, the balance shaft driving gear 41 drives the intake side balance shaft gear 42 to rotate, so that the intake side balance shaft gear 42 drives the intake side balance shaft 310 to rotate in the opposite direction to the balance shaft driving gear 41; a balance shaft intermediate gear 44 is arranged between the exhaust side balance shaft gear 43 and the balance shaft driving gear 41 on the exhaust side balance shaft 320, and the balance shaft intermediate gear 44 drives the balance shaft intermediate gear 44 to rotate, and the balance shaft intermediate gear 44 drives the exhaust side balance shaft gear 43 to rotate, so that the exhaust side balance shaft 320 can maintain the same direction of rotation as the balance shaft driving gear 41.

[0041] like Figure 1 and 2 As shown, at least two intake side support bearings 311 are provided on the intake side balance shaft 310, so that it can be rotatably installed at the position to be installed through the intake side support bearings 311; at least two exhaust side support bearings 321 are provided on the exhaust side balance shaft 320, so that it can be rotatably installed at the position to be installed through the exhaust side support bearings 321.

[0042] Preferably, the intake side support bearing 311 is a needle bearing.

[0043] Preferably, the exhaust side support bearing 321 is a needle bearing.

[0044] like Figures 1 to 4 As shown, the second chain transmission assembly 20 includes: a second chain 21, a second driving sprocket 22, an intake camshaft sprocket 23 and an exhaust camshaft sprocket 24, the second driving sprocket 22, the intake camshaft sprocket 23 and the exhaust camshaft sprocket 24 are arranged at intervals, the second chain 21 is sleeved outside the second driving sprocket 22, the intake camshaft sprocket 23 and the exhaust camshaft sprocket 24 and is meshed with the second driving sprocket 22, the intake camshaft sprocket 23 and the exhaust camshaft sprocket 24; the second driving sprocket 22 is coaxially arranged with the third one of the multiple sprockets of the first chain transmission assembly 10 to rotate synchronously, the intake camshaft sprocket 23 is sleeved on the intake camshaft 210 to drive the intake camshaft 210 to rotate, and the exhaust camshaft sprocket 24 is sleeved on the exhaust camshaft 220 to drive the exhaust camshaft 220 to rotate.

[0045] like Figures 3 to 6 As shown, the second chain transmission assembly 20 also includes: a fourth guide rail 25, which is arranged on the outer side of the portion of the second chain 21 located at the second drive sprocket 22 and the intake camshaft sprocket 23 and abuts against the second chain 21; a fifth guide rail 26, which is arranged on the outer side of the portion of the second chain 21 located at the intake camshaft sprocket 23 and the exhaust camshaft sprocket 24 and abuts against the second chain 21; a sixth guide rail 27, which is arranged on the outer side of the portion of the second chain 21 located at the second drive sprocket 22 and the exhaust camshaft sprocket 24 and abuts against the second chain 21; a second hydraulic tensioner 28, which is connected to the fourth guide rail 25 to drive the fourth guide rail 25 to move in a direction close to or away from the second chain 21 to adjust the tension of the second chain 21.

[0046] In this way, the second chain transmission assembly 20 drives the fourth guide rail 25 to move to tension the second chain 21 by setting the second hydraulic tensioner 28, which can reduce the swing amplitude of the second chain 21 and improve the reliability of the movement of the second chain 21.

[0047] like Figures 1 to 6 As shown, the third chain transmission assembly 30 includes: a third chain 31, a second crankshaft sprocket 32 ​​and an oil pump sprocket 33, the second crankshaft sprocket 32 ​​and the oil pump sprocket 33 are arranged at intervals, the third chain 31 is sleeved outside the second crankshaft sprocket 32 ​​and the oil pump sprocket 33 and is meshed with the second crankshaft sprocket 32 ​​and the oil pump sprocket 33; wherein the second crankshaft sprocket 32 ​​is sleeved on the crankshaft 100 to rotate with the crankshaft 100, and the oil pump sprocket 33 is sleeved on the assembly input shaft of the vacuum pump and the oil pump assembly to drive the assembly input shaft to rotate.

[0048] like Figures 3 to 6 As shown, the third chain transmission assembly 30 further includes a tensioning rail 34 . The tensioning rail 34 is disposed on the outside of the third chain 31 and abuts against the third chain 31 to tension the third chain 31 .

[0049] Specifically, the first chain 11 , the second chain 21 and the third chain 31 are all parallel to each other.

[0050] Optionally, the first crankshaft sprocket 12 and the second crankshaft sprocket 32 ​​are located at the same end of the crankshaft 100 , or the first crankshaft sprocket 12 and the second crankshaft sprocket 32 ​​are located at two ends of the crankshaft 100 , respectively.

[0051] The utility model also provides an engine, including a crankshaft 100, an intake camshaft 210, an exhaust camshaft 220, an intake side balance shaft 310, an exhaust side balance shaft 320, a fuel injection pump, a vacuum pump and an oil pump assembly. The crankshaft 100 is connected to the intake camshaft 210, the exhaust camshaft 220, the intake side balance shaft 310, the exhaust side balance shaft 320, the fuel injection pump, the vacuum pump and the oil pump assembly through a transmission mechanism.

[0052] Specifically, the engine includes a camshaft assembly 200 and a balance shaft assembly 300 . The camshaft assembly 200 includes an intake camshaft 210 and an exhaust camshaft 220 . The balance shaft assembly 300 includes an intake-side balance shaft 310 and an exhaust-side balance shaft 320 .

[0053] In the transmission mechanism of the present invention, the crankshaft 100 of the engine can drive the vacuum pump and the oil pump in the oil pan to move through the third chain transmission assembly 30. The vacuum pump and the oil pump assembly are arranged directly below the crankshaft 100, which can produce a damping effect to exert a balancing force in the downward opposite direction on the movement of the crankshaft 100, which is beneficial to the balance of the first-order overturning moment of the crankshaft system.

[0054] At the same time, the transmission mechanism of the utility model uses a plurality of hydraulic tensioners to tension the corresponding chains, which can reduce the swing amplitude of the corresponding chains, improve the transmission reliability of the transmission mechanism, and thus improve the NVH performance of the engine.

[0055] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0056] The transmission mechanism of the utility model is suitable for an engine, which includes a crankshaft 100, an intake camshaft 210, an exhaust camshaft 220, an intake side balance shaft 310, an exhaust side balance shaft 320, a fuel injection pump, a vacuum pump and an oil pump assembly, and the transmission mechanism includes: a first chain transmission component 10, a first one of the multiple sprockets of the first chain transmission component 10 is sleeved on the crankshaft 100 to rotate with the crankshaft 100 and is transmission-connected with the intake side balance shaft 310 and the exhaust side balance shaft 320 to drive the intake side balance shaft 310 and the exhaust side balance shaft 320 to rotate, a second one of the multiple sprockets of the first chain transmission component 10 is sleeved on the fuel injection pump input shaft of the fuel injection pump to drive the fuel injection pump input shaft to rotate; a second chain transmission component 2 0, the first of the multiple sprockets of the second chain drive assembly 20 is coaxially arranged with the third of the multiple sprockets of the first chain drive assembly 10 to rotate synchronously, the second of the multiple sprockets of the second chain drive assembly 20 is sleeved on the intake camshaft 210 to drive the intake camshaft 210 to rotate, and the third of the multiple sprockets of the second chain drive assembly 20 is sleeved on the exhaust camshaft 220 to drive the exhaust camshaft 220 to rotate; the third chain drive assembly 30, the first of the multiple sprockets of the third chain drive assembly 30 is sleeved on the crankshaft 100 to rotate with the crankshaft 100, and the second of the multiple sprockets of the third chain drive assembly 30 is sleeved on the assembly input shaft of the vacuum pump and oil pump assembly to drive the assembly input shaft to rotate. In this way, the transmission mechanism of the utility model realizes the transmission between the crankshaft 100 and the intake camshaft 210, the exhaust camshaft 220, the intake side balance shaft 310, the exhaust side balance shaft 320, the injection pump and the vacuum pump and the oil pump assembly by setting the first chain transmission assembly 10, the second chain transmission assembly 20 and the third chain transmission assembly 30 with compact structure and excellent performance, thereby improving the transmission efficiency of the engine, reducing the vibration and noise of the engine, increasing the service life of the engine, reducing the manufacturing cost and maintenance difficulty of the engine, and reducing the installation space required for the engine, thereby effectively solving the problems in the prior art that the engine transmission mechanism has a relatively complex structure, increased manufacturing cost and maintenance difficulty, and the overall layout is not compact enough and the required installation space is large.

[0057] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0058] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0059] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0060] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0061] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0062] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A transmission mechanism, characterized in that: Applicable to an engine, the engine comprising a crankshaft (100), an intake camshaft (210), an exhaust camshaft (220), an intake side balance shaft (310), an exhaust side balance shaft (320), an injection pump, a vacuum pump and an oil pump assembly, the transmission mechanism comprising: A first chain transmission assembly (10), wherein a first one of the plurality of sprockets of the first chain transmission assembly (10) is sleeved on the crankshaft (100) to rotate with the crankshaft (100) and is in transmission connection with both the intake side balance shaft (310) and the exhaust side balance shaft (320) to drive the intake side balance shaft (310) and the exhaust side balance shaft (320) to rotate, and a second one of the plurality of sprockets of the first chain transmission assembly (10) is sleeved on the fuel injection pump input shaft of the fuel injection pump to drive the fuel injection pump input shaft to rotate; A second chain transmission assembly (20), wherein a first one of the plurality of sprockets of the second chain transmission assembly (20) is coaxially arranged with a third one of the plurality of sprockets of the first chain transmission assembly (10) to rotate synchronously, a second one of the plurality of sprockets of the second chain transmission assembly (20) is sleeved on the intake camshaft (210) to drive the intake camshaft (210) to rotate, and a third one of the plurality of sprockets of the second chain transmission assembly (20) is sleeved on the exhaust camshaft (220) to drive the exhaust camshaft (220) to rotate; A third chain transmission assembly (30), wherein a first one of the multiple sprockets of the third chain transmission assembly (30) is sleeved on the crankshaft (100) to rotate with the crankshaft (100), and a second one of the multiple sprockets of the third chain transmission assembly (30) is sleeved on the assembly input shaft of the vacuum pump and oil pump assembly to drive the assembly input shaft to rotate.

2. The transmission mechanism according to claim 1, characterized in that: The first chain transmission assembly (10) comprises: A first chain (11), a first crankshaft sprocket (12), a fuel injection pump sprocket (14) and a first drive sprocket (13); the first crankshaft sprocket (12), the fuel injection pump sprocket (14) and the first drive sprocket (13) are arranged at intervals; the first chain (11) is sleeved outside the first crankshaft sprocket (12), the fuel injection pump sprocket (14) and the first drive sprocket (13) and is meshed with the first crankshaft sprocket (12), the fuel injection pump sprocket (14) and the first drive sprocket (13); The first crankshaft sprocket (12) is sleeved on the crankshaft (100) to rotate with the crankshaft (100) and is in transmission connection with the intake side balance shaft (310) and the exhaust side balance shaft (320) to drive the intake side balance shaft (310) and the exhaust side balance shaft (320) to rotate; the fuel injection pump sprocket (14) is sleeved on the fuel injection pump input shaft of the fuel injection pump to drive the fuel injection pump input shaft to rotate; the first drive sprocket (13) is coaxially arranged with the first of the multiple sprockets of the second chain transmission assembly (20) to rotate synchronously.

3. The transmission mechanism according to claim 2, characterized in that: The first chain transmission assembly (10) further comprises: a first guide rail (15), the first guide rail (15) being arranged outside a portion of the first chain (11) located at the first crankshaft sprocket (12) and the fuel injection pump sprocket (14) and being in contact with the first chain (11); a second guide rail (16), the second guide rail (16) being arranged outside a portion of the first chain (11) located at the injection pump sprocket (14) and the first drive sprocket (13) and being in contact with the first chain (11); a third guide rail (17), the third guide rail (17) being arranged outside a portion of the first chain (11) located at the first crankshaft sprocket (12) and the first drive sprocket (13) and being in contact with the first chain (11); A first hydraulic tensioner (18), wherein the first hydraulic tensioner (18) is connected to the third guide rail (17) to drive the third guide rail (17) to move in a direction approaching or away from the first chain (11) to adjust the tension of the first chain (11).

4. The transmission mechanism according to claim 3, characterized in that: The transmission mechanism comprises: a balance shaft driving gear (41), the balance shaft driving gear (41) being coaxially arranged with the first crankshaft sprocket (12) so as to rotate synchronously with the first crankshaft sprocket (12); An intake side balance shaft gear (42), wherein the intake side balance shaft gear (42) is meshed with the balance shaft driving gear (41) and is sleeved on the intake side balance shaft (310) to drive the intake side balance shaft (310) to rotate.

5. The transmission mechanism according to claim 4, characterized in that: The transmission mechanism also includes: An exhaust side balance shaft gear (43), wherein the exhaust side balance shaft gear (43) is sleeved on the exhaust side balance shaft (320) to drive the exhaust side balance shaft (320) to rotate; A balance shaft intermediate gear (44), wherein the balance shaft intermediate gear (44) is rotatably disposed on the first guide rail (15), the balance shaft intermediate gear (44) is located between the balance shaft driving gear (41) and the exhaust side balance shaft gear (43) and is meshed with the balance shaft driving gear (41) and the exhaust side balance shaft gear (43), and the balance shaft driving gear (41) drives the exhaust side balance shaft gear (43) to rotate via the balance shaft intermediate gear (44).

6. The transmission mechanism according to claim 1, characterized in that: The second chain transmission assembly (20) comprises: a second chain (21), a second driving sprocket (22), an intake camshaft sprocket (23) and an exhaust camshaft sprocket (24); the second driving sprocket (22), the intake camshaft sprocket (23) and the exhaust camshaft sprocket (24) are arranged at intervals; the second chain (21) is sleeved outside the second driving sprocket (22), the intake camshaft sprocket (23) and the exhaust camshaft sprocket (24) and is meshed with the second driving sprocket (22), the intake camshaft sprocket (23) and the exhaust camshaft sprocket (24); The second driving sprocket (22) is coaxially arranged with the third one of the multiple sprockets of the first chain transmission assembly (10) to rotate synchronously, the intake camshaft sprocket (23) is sleeved on the intake camshaft (210) to drive the intake camshaft (210) to rotate, and the exhaust camshaft sprocket (24) is sleeved on the exhaust camshaft (220) to drive the exhaust camshaft (220) to rotate.

7. The transmission mechanism according to claim 6, characterized in that: The second chain transmission assembly (20) further comprises: a fourth guide rail (25), the fourth guide rail (25) being arranged outside a portion of the second chain (21) located at the second drive sprocket (22) and the intake camshaft sprocket (23) and abutting against the second chain (21); a fifth guide rail (26), the fifth guide rail (26) being arranged outside a portion of the second chain (21) located at the intake camshaft sprocket (23) and the exhaust camshaft sprocket (24) and abutting against the second chain (21); a sixth guide rail (27), the sixth guide rail (27) being arranged outside a portion of the second chain (21) located between the second drive sprocket (22) and the exhaust camshaft sprocket (24) and being in contact with the second chain (21); A second hydraulic tensioner (28), the second hydraulic tensioner (28) is connected to the fourth guide rail (25) to drive the fourth guide rail (25) to move in a direction approaching or away from the second chain (21) to adjust the tension of the second chain (21).

8. The transmission mechanism according to claim 1, characterized in that: The third chain transmission assembly (30) comprises: a third chain (31), a second crankshaft sprocket (32) and an oil pump sprocket (33), wherein the second crankshaft sprocket (32) and the oil pump sprocket (33) are arranged at intervals, and the third chain (31) is sleeved outside the second crankshaft sprocket (32) and the oil pump sprocket (33) and is meshed with the second crankshaft sprocket (32) and the oil pump sprocket (33); The second crankshaft sprocket (32) is sleeved on the crankshaft (100) to rotate with the crankshaft (100), and the oil pump sprocket (33) is sleeved on the assembly input shaft of the vacuum pump and oil pump assembly to drive the assembly input shaft to rotate.

9. The transmission mechanism according to claim 8, characterized in that: The third chain transmission assembly (30) further comprises a tensioning guide rail (34), wherein the tensioning guide rail (34) is arranged on the outside of the third chain (31) and abuts against the third chain (31) to tension the third chain (31).

10. An engine, characterized in that: The invention comprises a crankshaft (100), an intake camshaft (210), an exhaust camshaft (220), an intake side balance shaft (310), an exhaust side balance shaft (320), a fuel injection pump, a vacuum pump and an oil pump assembly, and a transmission mechanism according to any one of claims 1 to 9, wherein the crankshaft (100) is connected to the intake camshaft (210), the exhaust camshaft (220), the intake side balance shaft (310), the exhaust side balance shaft (320), the fuel injection pump and the vacuum pump and oil pump assembly through the transmission mechanism.

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