CN211009765U

CN211009765U - Novel timing tooth-shaped chain transmission system

Info

Publication number: CN211009765U
Application number: CN201921126747.6U
Authority: CN
Inventors: 汤乐超; 卢炳武; 何洪源; 刘英杰; 牛文博
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2019-07-18
Filing date: 2019-07-18
Publication date: 2020-07-14
Anticipated expiration: 2029-07-18

Abstract

The utility model belongs to the technical field of automobile engine, specific novel timing profile of tooth chain drive system that says so. The system comprises a crankshaft chain wheel, a timing chain, an engine oil pump shaft chain wheel, a fixed guide rail, an exhaust camshaft chain wheel, an intake camshaft chain wheel, a hydraulic tensioner and a tensioning guide rail; the crankshaft chain wheel, the engine oil pump shaft chain wheel, the fixed guide rail, the exhaust camshaft chain wheel, the intake camshaft chain wheel, the hydraulic tensioner and the tensioning guide rail are sequentially connected through a timing chain; the crankshaft chain wheel drives the motor oil pump shaft chain wheel, the exhaust camshaft chain wheel and the intake camshaft chain wheel to rotate through the timing chain; the hydraulic tensioner is in contact with a tensioning rail; the tensioning guide rail is arranged on one side of the crankshaft chain wheel; the hydraulic tensioner is arranged at the meshing position of the timing chain and the intake camshaft chain wheel. The utility model discloses can reduce engine timing chain's fluctuation and meshing noise, it is undulant to reduce the chain slack side.

Description

Novel timing tooth-shaped chain transmission system

Technical Field

The utility model belongs to the technical field of automobile engine, specific novel timing profile of tooth chain drive system that says so.

Background

The timing chain system is used as a device for connecting a crankshaft, a camshaft and an engine oil pump shaft or a balance shaft and is an important component of an engine air distribution system. In order to ensure precise rotation angles of the individual shafts in different speed, acceleration and temperature and oil pressure ranges, low chain noise and high system reliability, increased demands are made on the layout of the timing chain system.

For some timing chain system layout types in the prior art, an auxiliary oil pump chain system needs to be added to drive an oil pump shaft to rotate, so that the design difficulty is improved, and the cost is increased; the installation position of the hydraulic tensioner and the profile line of the tensioning guide rail cannot meet the requirements of the accurate rotation angle, low noise, high reliability and other indexes of the cam shaft in the timing chain system.

Disclosure of Invention

The utility model provides a simple structure's novel timing profile of tooth chain drive system, this system can reduce engine timing chain's undulant and meshing noise, and it is undulant to reduce the chain slack side, has solved the above-mentioned not enough that current timing chain exists.

The technical scheme of the utility model is explained as follows with the attached drawings:

a novel timing toothed chain transmission system comprises a crankshaft chain wheel 1, a timing chain 2, an oil pump shaft chain wheel 3, a fixed guide rail 4, an exhaust camshaft chain wheel 5, an intake camshaft chain wheel 6, a hydraulic tensioner 7 and a tensioning guide rail 8; the crankshaft chain wheel 1, the oil pump shaft chain wheel 3, the fixed guide rail 4, the exhaust camshaft chain wheel 5, the intake camshaft chain wheel 6, the hydraulic tensioner 7 and the tensioning guide rail 8 are sequentially connected through the timing chain 2; the crankshaft chain wheel 1 drives an oil pump shaft chain wheel 3, an exhaust camshaft chain wheel 5 and an intake camshaft chain wheel 6 to rotate through a timing chain 2; the hydraulic tensioner 7 is in contact with the tensioning rail 8; the tensioning guide rail 8 is arranged on one side of the crankshaft chain wheel 1; the hydraulic tensioner 7 is provided at the meshing position of the timing chain 2 and the intake camshaft sprocket 6.

The timing chain 2 comprises a guide plate 21, an inner and outer composite meshing inner chain plate 22, an outer meshing inner chain plate 23 and a pin shaft 24; the guide plates 21 are arranged on the uppermost layer and the lowermost layer, and the intermediate layer is formed by alternately arranging inner and outer composite meshing inner chain plates 22 and outer meshing inner chain plates 23 which are connected through pin shafts 24.

The fixed guide rail 4 comprises a guide slide rail 41 and a first base body 42; two first base bodies 42 are arranged and vertically fixed on the guide slide rail 41; a first anti-moving rib 411 for preventing the timing chain 2 from moving in a moving manner is arranged on the side surface of the guide slide rail 41; the material of the first substrate 42 is cast aluminum alloy; the material of the guide rail 41 is PA 66.

The tension guide rail 8 comprises a contact block 81, a second base 82 and a tension slide rail 83; the two contact blocks 81 are arranged at two ends of the tensioning guide rail 8; the upper end of the second base 82 is provided with a tensioning slide rail 83; the contact block 81 is in contact with the hydraulic tensioner 7; the outline of the contact block 81 is arc-shaped; a second anti-moving rib 831 for preventing the timing chain 2 from moving in a moving manner is arranged on the side surface of the tensioning slide rail 83; the material of the second substrate 82 is cast aluminum alloy; the material of the tensioning rail 83 is PA 66.

The utility model has the advantages that:

1) the design of the oil pump chain wheel in the utility model avoids the additional design of an oil pump chain system to drive the rotation of the motor oil pump shaft, saves the cost and shortens the research and development period of the engine;

2) the position layout of the middle hydraulic tensioner and the tensioning guide rail can reduce the fluctuation amount of the chain when the timing chain 2 is meshed with the air inlet camshaft chain wheel 6, so that the meshing is smoother, the meshing noise of the timing chain system is reduced, and the service life of the timing chain 2 is prolonged;

3) the timing chain in the utility model assembles the internal and external composite meshing inner chain plates and the external meshing inner chain plates according to the requirement in a certain sequence, and adopts a multilayer arrangement mode, thereby not only reducing the noise of the chain, but also ensuring that the timing chain 2 has higher strength;

4) the fixed guide rail and the tensioning guide rail in the utility model are formed by combining parts made of different materials, thereby not only ensuring the strength requirement and the wear resistance requirement of the system, but also realizing the light weight of the engine;

5) the guide slide rail and the tensioning slide rail in the utility model are respectively provided with anti-moving flanges, thereby avoiding the movement of the chain and ensuring the reliability of the timing system;

6) the utility model discloses a contact piece outline is convex, has guaranteed that hydraulic pressure tensioning ware's plunger has good contact condition with the contact piece all the time, and the material has adopted PA66 moreover, has improved the wearability.

Drawings

Fig. 1 is an overall layout diagram of the present invention;

FIG. 2 is a layout of the positions of the hydraulic tensioner and the tensioning rail;

FIG. 3 is a front view of an arrangement of timing chains;

FIG. 4 is a top view of a timing chain arrangement;

FIG. 5 is an assembly view of the stationary guide rail;

FIG. 6 is a detail view of a guide rail in the stationary guide;

FIG. 7 is a detail view of the base in the stationary guide;

FIG. 8 is an assembly view of the tension rail;

FIG. 9 is a detail view of a contact block in the tension rail;

FIG. 10 is a detail view of the base in the tension rail;

fig. 11 is a detail view of a tension shoe in the tension rail.

In the figure: 1. a crankshaft sprocket; 2. a timing chain; 3. a motor oil pump shaft sprocket; 4. fixing the guide rail; 5. an exhaust camshaft sprocket; 6. an intake camshaft sprocket; 7. a hydraulic tensioner; 8. tensioning the guide rail; 21. a guide plate; 22. the inner and outer composite meshing inner chain plates; 23. an outer engagement inner link plate; 24. a pin shaft; 41. a guide slide rail; 42. a first substrate; 81. a contact block; 82. a second substrate; 83. tensioning the slide rail; 411. a first anti-moving flange; 831. and the second anti-moving flange.

Detailed Description

Referring to fig. 1 and 2, a novel timing toothed chain transmission system comprises a crankshaft sprocket 1, a timing chain 2, an oil pump shaft sprocket 3, a fixed guide rail 4, an exhaust camshaft sprocket 5, an intake camshaft sprocket 6, a hydraulic tensioner 7 and a tensioning guide rail 8; the crankshaft chain wheel 1, the oil pump shaft chain wheel 3, the fixed guide rail 4, the exhaust camshaft chain wheel 5, the intake camshaft chain wheel 6, the hydraulic tensioner 7 and the tensioning guide rail 8 are sequentially connected through the timing chain 2; the crankshaft chain wheel 1 drives the oil pump shaft chain wheel 3, the exhaust camshaft chain wheel 5 and the intake camshaft chain wheel 6 to rotate through the timing chain 2, and the timing phase angle among the crankshaft, the intake camshaft and the exhaust camshaft is guaranteed. The hydraulic tensioner 7 is in contact with the tensioning guide rail 8 to maintain the timing chain 2 to be tensioned; the fixed guide rail 4 mainly plays a role of guiding on the tight side. The hydraulic tensioner 7 is provided at the meshing position of the timing chain 2 and the intake camshaft sprocket 6. The oil pump chain wheel 3 is arranged in the timing system and driven by the timing chain 2, so that the additional design of the oil pump chain system is avoided, the design cost is reduced, and the development cycle of the engine is shortened.

Referring to fig. 2, the installation position of the tension guide rail 8 is arranged near the crankshaft sprocket 1, and the hydraulic tensioner 7 is arranged at the meshing position of the timing chain 2 and the intake camshaft sprocket 6, so that the layout mode reduces the loose-edge chain fluctuation on the whole, ensures the meshing smoothness of the timing chain 2 and the intake camshaft sprocket 6, and reduces the noise. The hydraulic tensioner 7 is arranged at the position farthest away from the rotation center of the tensioning guide rail 8, the moment arm of the acting force of the hydraulic tensioner 7 is longest at the moment, the generated acting force is minimum according to moment balance, and the displacement of the plunger is minimum, so that the chain fluctuation amount at the meshing position of the timing chain 2 and the air inlet camshaft chain wheel 6 is also minimum, the timing chain 2 is stably meshed with the air inlet camshaft chain wheel 5, the meshing noise is reduced, and the service life of a timing chain system is prolonged.

Referring to fig. 3 and 4, the timing chain 2 is composed of a guide plate 21, an inner and outer composite meshing inner link plate 22, an outer meshing inner link plate 23 and a pin shaft 24, and is assembled in a sequence of 4 × 5, which reduces noise of the timing chain 2 and ensures high strength of the timing chain 2.

Referring to fig. 5, 6 and 7, the fixed guide rail 4 is formed by combining the guide rail 41 and the first base 42, wherein the base 42 is made of cast aluminum alloy, which ensures the strength requirement of the fixed guide rail and realizes the light weight of the engine.

The material of the guide rail 41 shown is PA66, which ensures a high wear resistance when the rail is in contact with the chain.

The guide rail 41 shown has a first anti-running rib 411 to avoid chain running and ensure the reliability of the timing system.

Referring to fig. 8, 9, 10 and 11, the tension rail 8 is composed of a contact block 81, a second base 82 and a tension rail 83, so that the difficulty of the processing process is reduced and the cost is saved. The contact block 81 and the tensioning slide rail 83 are made of PA66, so that high abrasion resistance is guaranteed when the contact block 81 is in contact with the hydraulic tensioner 7 and when the tensioning slide rail 83 is in contact with the timing chain 2.

The contact block 81 is shown as a circular arc in profile, ensuring that the plunger of the hydraulic tensioner 7 always has good contact conditions with the contact block 81.

The second substrate 82 is shown as being cast aluminum alloy, which ensures strength requirements for the stationary rail and achieves engine lightweight.

The tensioning slide rail 83 shown has a second anti-running rib 831 which prevents the chain from running and ensures the reliability of the timing system.

Claims

1. A novel timing toothed chain transmission system is characterized by comprising a crankshaft chain wheel (1), a timing chain (2), an oil pump shaft chain wheel (3), a fixed guide rail (4), an exhaust camshaft chain wheel (5), an intake camshaft chain wheel (6), a hydraulic tensioner (7) and a tensioning guide rail (8); the crankshaft chain wheel (1), the engine oil pump shaft chain wheel (3), the fixed guide rail (4), the exhaust camshaft chain wheel (5), the intake camshaft chain wheel (6), the hydraulic tensioner (7) and the tensioning guide rail (8) are sequentially connected through the timing chain (2); the crankshaft chain wheel (1) drives an oil pump shaft chain wheel (3) of a motor, an exhaust camshaft chain wheel (5) and an intake camshaft chain wheel (6) to rotate through a timing chain (2); the hydraulic tensioner (7) is in contact with a tensioning rail (8); the tensioning guide rail (8) is arranged on one side of the crankshaft chain wheel (1); the hydraulic tensioner (7) is arranged at a meshing position of the timing chain (2) and the intake camshaft chain wheel (6); the timing chain (2) comprises a guide plate (21), an inner and outer composite meshing inner chain plate (22), an outer meshing inner chain plate (23) and a pin shaft (24); the guide plates (21) are arranged on the uppermost layer and the lowermost layer, and the middle layer is formed by alternately arranging inner and outer composite meshing inner chain plates (22) and outer meshing inner chain plates (23) and is connected through a pin shaft (24); the fixed guide rail (4) comprises a guide slide rail (41) and a first base body (42); two first base bodies (42) are vertically fixed on the guide sliding rail (41); a first anti-moving rib (411) for preventing the timing chain (2) from moving in a moving way is arranged on the side surface of the guide slide rail (41); the material of the first substrate (42) is cast aluminum alloy; the material of the guide sliding rail (41) is PA 66; the tensioning guide rail (8) comprises a contact block (81), a second base body (82) and a tensioning slide rail (83); the two contact blocks (81) are arranged at two ends of the tensioning guide rail (8); the upper end of the second base body (82) is provided with an expanding slide rail (83); the contact block (81) is in contact with the hydraulic tensioner (7); the outline of the contact block (81) is arc-shaped; a second anti-moving rib (831) for preventing the timing chain (2) from moving in a moving way is arranged on the side surface of the tensioning slide rail (83); the material of the second substrate (82) is cast aluminum alloy; the material of the stretching slide rail (83) is PA 66.