Hybrid engine front end accessory driving system based on fan power switching

Abstract

The invention relates to the technical field of engine front-end accessories, and particularly discloses a hybrid engine front-end accessory driving system based on fan power switching. The system comprises two layers of wheel trains, and the first layer of wheel train is composed of a crankshaft belt pulley and a crankshaft layer fan belt pulley and connected with an engine through a belt; and the second-layer wheel train consists of a generator belt pulley and a generator-layer fan belt pulley, and is connected with the generator through a belt. The generator layer fan belt pulley and the crankshaft layer fan belt pulley are integrated on the same fan shaft part and are jointly installed on a shaft connecting bearing of the fan shaft part, the crankshaft layer fan belt pulley is connected with the shaft connecting bearing through a one-way bearing, and therefore automatic switching of the fan among different driving sources is achieved. The fan can be driven through the engine or the generator according to different working conditions, energy consumption is reduced, the operation efficiency of the cooling system is improved, and the heat management requirements of multi-scene hybrid vehicles are met.

Description

Technical Field

[0001] The present invention relates to the technical field of engine front-end accessory drive systems, and in particular to a hybrid engine front-end accessory drive system based on fan power switching. Background Art

[0002] The front-end accessory system of the fuel engine of a traditional commercial vehicle transmits the power output from the engine crankshaft end to each accessory through a belt to ensure the normal operation of each accessory. Generally speaking, the front-end accessory drive system of the engine includes accessories such as the crankshaft wheel, air-conditioning compressor, fan, generator, and water pump. In long-distance, high-speed, and high-load usage scenarios, all accessories in the front-end accessory drive system of the engine need to work normally; in special scenarios such as short-distance rural national roads, the entire front-end accessory drive system of the engine only requires the fan to run, and other accessories do not work. As an important part of the front-end accessory drive system of the engine, the fan accounts for a relatively large proportion of power. Due to the multi-scenario usage characteristics of commercial vehicles, in order to meet the prerequisite that only the fan works in special scenarios, the power consumption of the entire front-end accessory drive system of the engine is reduced as much as possible to achieve energy conservation and emission reduction. Therefore, it is necessary to realize the power switching of the fan in different usage scenarios.

[0003] The engine front-end accessory drive system of traditional commercial vehicles cannot realize the power switching of the fan under multiple scenarios. Therefore, a hybrid engine front-end accessory drive system and a corresponding fan shaft component are proposed based on fan power switching. The vehicle control system can control the engine front-end accessory drive system according to the parameters budgeted in different usage scenarios to realize the power switching of the fan under multiple scenarios, and finally achieve the effect of energy saving and emission reduction. Therefore, it is of great significance to develop a hybrid engine front-end accessory drive system and a corresponding fan shaft component based on fan power switching. Summary of the invention

[0004] The purpose of the present invention is to provide a hybrid engine front-end accessory drive system based on fan power switching, so that when the engine is driven, the two-layer gear train is driven to operate to realize the fan operation; when the generator is driven, only the motor layer gear train is driven to operate to realize the fan operation. This solution improves the flexibility of fan driving and adapts to the driving requirements of different power sources.

[0005] The present invention is achieved by adopting the following technical solutions: A hybrid engine front-end accessory drive system based on fan power switching, characterized in that it comprises two layers of gear trains: the first layer of gear train includes a crankshaft pulley and a crankshaft layer fan pulley, which are connected by belt drive to receive the engine output power; the second layer of gear train includes a generator pulley and a generator layer fan pulley, which are connected by belt drive to receive the generator output power; the generator layer fan pulley and the crankshaft layer fan pulley are integrated on the same fan shaft component, and both are commonly installed on the shaft connecting bearing of the fan shaft component, and the generator layer fan pulley is in interference fit with the shaft connecting bearing; the crankshaft layer fan pulley is connected to the shaft connecting bearing through a one-way bearing; the fan is installed on the generator layer fan pulley; the shaft connecting bearing is installed in the bearing seat.

[0006] Further, when the engine drives the crankshaft pulley to rotate, the shaft connecting bearing is driven to rotate through the crankshaft layer fan pulley via the one-way bearing, and then the generator layer fan pulley and the fan are driven to rotate.

[0007] Further, when the generator drives the generator pulley to rotate, the shaft connecting bearing and the fan are directly driven to rotate through the generator layer fan pulley. At this time, the crankshaft layer fan pulley does not rotate with the shaft connecting bearing due to the action of the one-way bearing.

[0008] Further, a dust cover is also installed on the bearing seat. The setting of the dust cover can effectively prevent dust and particles from entering the bearing system, and improve the service life and reliability of the bearing.

[0009] Further, the one-way bearing includes a one-way bearing inner ring and a one-way bearing outer ring. The one-way bearing inner ring is in interference fit with the shaft connecting bearing, and the one-way bearing outer ring is in interference fit with the inner hole of the crankshaft layer fan pulley. This design ensures the one-way effective transmission during crankshaft drive, and at the same time avoids excessive frictional losses during generator drive.

[0010] Further, two installation positions are provided on the shaft connecting bearing, namely the shaft connecting bearing shaft end one and the shaft connecting bearing shaft end two. The shaft connecting bearing shaft end two is located at the end position of the shaft connecting bearing, and the shaft connecting bearing shaft end one is located on one side of the shaft connecting bearing shaft end two. The multi-section shaft end structure provides a reliable installation interface for the multi-gear train components, ensuring the smoothness of power transmission and the modular assembly ability.

[0011] Further, the diameter of the shaft connecting bearing shaft end two is smaller than that of the shaft connecting bearing shaft end one. Through the shaft diameter difference setting, the matching accuracy between different components is optimized, interference is avoided, and the structural integration is improved.

[0012] The beneficial effects of the hybrid engine front-end accessory drive system based on fan power switching described in the present invention include: The application of the fan shaft component in a hybrid vehicle model is solved, enabling the operation of the fan to be driven by the engine or independently by the generator, and ultimately realizing the power switching of the fan in different modes. By intelligently switching the fan drive source, fuel consumption and power loss are minimized, thus achieving energy conservation and emission reduction. Brief Description of the Drawings

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0014] Figure 1 It is a schematic diagram of a hybrid engine front-end accessory drive system based on fan power switching; Figure 2 It is a schematic diagram of the fan shaft component; Figure 3 It is a schematic diagram of the crankshaft layer fan pulley assembly; Figure 4 It is a schematic diagram of the shaft-connected bearing; In the figure, 1. Generator layer fan pulley; 2. Crankshaft layer fan pulley; 3. One-way bearing; 4. Bearing seat; 5. Shaft-connected bearing; 6. Dust cover; 7. Generator pulley; 8. Crankshaft pulley; 21. Inner hole of the crankshaft layer fan pulley; 31. Inner ring of the one-way bearing; 32. Outer ring of the one-way bearing; 51. First shaft end of the shaft-connected bearing; 52. Second shaft end of the shaft-connected bearing. Detailed Description of the Embodiments

[0015] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents the selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0017] Such as Figures 1-4As shown, a hybrid engine front-end accessory drive system based on fan power switching includes two layers of gear trains and is driven by two belts, wherein the generator layer fan pulley 1 and the crankshaft layer fan pulley 2 are respectively connected to the engine and the generator through belts, and the first layer of gear train is composed of the crankshaft pulley 8, the crankshaft layer fan pulley 2, the automatic tensioner and other power-carrying accessory pulleys; the second layer of gear train is composed of the generator layer fan pulley 1, the generator pulley 7 and the idler pulley, and the fan shaft can be driven separately through the two layers of gear trains, and at the same time, other engine front-end accessories except the fan are driven through the first layer of gear train, that is, through the engine.

[0018] The fan pulley at the crankshaft layer and the fan pulley at the generator layer are integrated on the same fan shaft component, and the fan is connected to the fan pulley at the generator layer. Due to the function of the fan shaft component with a one-way bearing, the engine front-end accessory drive system can realize that when the engine is driven, the crankshaft drives the two-layer gear train to operate and thus drives the fan to operate; when the generator is driven alone, only the generator layer gear train operates to drive the fan to operate, ultimately realizing the power switching of the fan in different usage scenarios.

[0019] The generator layer fan pulley 1 and the crankshaft layer fan pulley 2 are both installed on the shaft bearing 5, wherein the generator layer fan pulley 1 and the shaft bearing 5 are interference fit, so that the generator layer fan pulley 1 and the shaft bearing 5 rotate together, and the crankshaft layer fan pulley 2 is connected to the shaft bearing 5 through a one-way bearing 3, so that the crankshaft layer fan pulley 2 produces relative movement with the shaft bearing 5 in one rotation direction.

[0020] Under actual operating conditions, when the generator layer fan pulley 1 is driven to rotate by the generator, the shaft bearing 5 rotates driven by the generator layer fan pulley 1. Due to the action of the one-way bearing 3, the crankshaft layer fan pulley 2 does not rotate with the shaft bearing 5. At this time, the generator independently drives the fan.

[0021] When the crankshaft layer fan pulley 2 is driven to rotate by the engine, the shaft-connecting bearing 5 rotates under the drive of the crankshaft layer fan pulley 2 due to the action of the one-way bearing 3, and at this time, the generator layer fan pulley 1 rotates as a driven wheel following the shaft-connecting bearing 5. At this time, the engine independently drives the fan.

[0022] Due to the function of the fan shaft component with a one-way bearing, the engine front end accessory drive realizes that when the engine is driven, the crankshaft drives the two-layer gear train to drive the fan to run; when the generator is driven alone, only the generator layer gear train runs to drive the fan to run. According to the preset parameters in different scenarios, the vehicle's control system issues corresponding instructions to realize the power switching of the fan in different usage scenarios.

[0023] The shaft-connected bearing 5 is installed in the bearing housing 4, and a dust cover 6 is also installed on the bearing housing 4.

[0024] The one-way bearing 3 includes a one-way bearing inner ring 31 and a one-way bearing outer ring 32. The one-way bearing inner ring 31 is in interference fit with the shaft-connected bearing 5, and the one-way bearing outer ring 32 is in interference fit with the inner hole of the crankshaft layer fan pulley 2.

[0025] Two mounting positions are provided on the shaft-connected bearing 5, namely the first shaft end 51 of the shaft-connected bearing and the second shaft end 52 of the shaft-connected bearing. The second shaft end 52 of the shaft-connected bearing is located at the end position of the shaft-connected bearing 5. The first shaft end 51 of the shaft-connected bearing is located on one side of the second shaft end 52 of the shaft-connected bearing. The diameter of the second shaft end 52 of the shaft-connected bearing is smaller than that of the first shaft end 51 of the shaft-connected bearing.

[0026] The one-way bearing inner ring 31 is in interference fit with the first shaft end 51 of the shaft-connected bearing, and the generator layer fan pulley 1 is in interference fit with the second shaft end 52 of the shaft-connected bearing.

[0027] For this embodiment, it mainly aims at the fuel engine of commercial vehicles. In usage scenarios such as long-distance, high-speed, and high-load, all accessories in the engine front-end accessory drive system need to work properly. The operation of the fan is driven by the engine. The engine drives the crankshaft to rotate, thereby driving the crankshaft layer fan pulley to rotate. Due to the function of the one-way bearing, the rotation of the crankshaft layer fan pulley drives the shaft-connected bearing and the generator layer fan pulley to rotate, ultimately realizing the operation of the fan. In special scenarios such as short-distance rural national roads, only the fan needs to operate in the entire engine front-end accessory drive system, and other accessories do not work. The operation of the fan is driven by the generator. The generator drives the generator layer gear train to rotate directly to drive the rotation of the generator layer fan pulley, thereby realizing the operation of the fan. In this working condition, due to the function of the one-way bearing, only the one-way bearing inner ring rotates, and the crankshaft layer gear train does not rotate. According to the preset parameters in different scenarios, the vehicle control system issues corresponding instructions to achieve the power switching of the fan in different usage scenarios.

[0028] In the above embodiments, the basic principles, main features, and advantages of the present invention are described. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, any modifications and changes made by those skilled in the art that do not depart from the spirit and scope of the present invention should fall within the protection scope of the appended claims of the present invention.

Claims

1. A hybrid engine front-end accessory drive system based on fan power switching, characterized in that: The invention comprises two gear trains: the first gear train comprises a crankshaft pulley (8) and a crankshaft fan pulley (2), which are connected by a belt transmission and are used to receive the output power of the engine; the second gear train comprises a generator pulley (7) and a generator fan pulley (1), which are connected by a belt transmission and are used to receive the output power of the generator; the generator fan pulley (1) and the crankshaft fan pulley (2) are integrated on the same fan shaft component, and are both mounted on a shaft-connected bearing (5) of the fan shaft component, and the generator fan pulley (1) and the shaft-connected bearing (5) are interference fit; the crankshaft fan pulley (2) is connected to the shaft-connected bearing (5) via a one-way bearing (3); the fan is mounted on the generator fan pulley (1); and the shaft-connected bearing (5) is mounted in a bearing seat (4).

2. A hybrid engine front-end accessory drive system based on fan power switching according to claim 1, characterized in that: When the engine drives the crankshaft pulley (8) to rotate, the crankshaft layer fan pulley (2) drives the shaft-connecting bearing (5) to rotate via the one-way bearing (3), thereby driving the generator layer fan pulley (1) and the fan to rotate.

3. A hybrid engine front-end accessory drive system based on fan power switching according to claim 1, characterized in that: When the generator drives the generator pulley (7) to rotate, the generator layer fan pulley (1) directly drives the shaft-connected bearing (5) and the fan to rotate. At this time, the crankshaft layer fan pulley (2) does not rotate with the shaft-connected bearing (5) due to the action of the one-way bearing (3).

4. A hybrid engine front-end accessory drive system based on fan power switching according to claim 1, characterized in that: A dust cover (6) is also installed on the bearing seat (4).

5. The hybrid engine front-end accessory drive system based on fan power switching according to claim 1, characterized in that: The one-way bearing (3) comprises a one-way bearing inner ring (31) and a one-way bearing outer ring (32); the one-way bearing inner ring (31) is interference fit with the shaft-connected bearing (5); and the one-way bearing outer ring (32) is interference fit with the inner hole of the crankshaft fan pulley (2).

6. The hybrid engine front-end accessory drive system based on fan power switching according to claim 1, characterized in that: The shaft-connecting bearing (5) is provided with two installation positions, namely, shaft-connecting bearing shaft end 1 (51) and shaft-connecting bearing shaft end 2 (52); the shaft-connecting bearing shaft end 2 (52) is located at the end of the shaft-connecting bearing (5); and the shaft-connecting bearing shaft end 1 (51) is located on one side of the shaft-connecting bearing shaft end 2 (52).

7. A hybrid engine front-end accessory drive system based on fan power switching according to claim 6, characterized in that: The diameter of the second shaft-connecting bearing shaft end (52) is smaller than the diameter of the first shaft-connecting bearing shaft end (51).

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