Engine belt driving system and vehicle

Abstract

The invention discloses an engine belt driving system. The system comprises a crankshaft pulley; the crankshaft belt pulley is in power connection with the compressor belt pulley through a first belt; the crankshaft belt pulley is in power connection with the motor belt pulley through a second belt; the first belt and the second belt are multi-wedge belts; the compressor and / or the motor are / is directly connected with the engine cylinder body. According to the engine belt driving system, the radial load of accessories can be reduced by adopting the double belts, and the engine belt driving system is more compact in structure and lower in cost.

Description

Technical Field

[0001] The present invention relates to an accessory drive system of an engine, and more particularly, to an engine belt drive system of a vehicle and a vehicle including such a system. Background Art

[0002] The engine belt drive system is a subsystem of the engine, and its main components include crankshaft pulleys, belts, tensioners, generators, compressors, pumps, etc. The power transmission of the engine belt drive system is achieved by transferring the engine torque to each accessory through the crankshaft and crankshaft pulley through the belt. The requirements for the belt drive system include effectively transmitting the engine power to each driven accessory through the belt within the full engine speed range and the vehicle life requirements. Summary of the invention

[0003] The purpose of this application is to solve or at least alleviate the problems existing in the prior art.

[0004] One aspect of the present invention provides an engine belt drive system, comprising:

[0005] Crankshaft pulley;

[0006] a compressor pulley, the crankshaft pulley being dynamically connected to the compressor pulley via a first belt;

[0007] A motor pulley, wherein the crankshaft pulley is dynamically connected to the motor pulley via a second belt;

[0008] The first belt and the second belt are poly-V belts;

[0009] The compressor and / or the electric motor are directly connected to the engine block.

[0010] In the engine belt drive system according to the present invention, the poly-V belt comprises a cord, a back and a plurality of wedge portions, the first side of the poly-V belt has a back, the second side of the poly-V belt opposite to the first side is provided with a plurality of wedge portions, one or more cords are provided between the first side and the second side, the cords of the first belt and / or the second belt are nylon cords, the back and the wedge portions are made of EPDM rubber, and there is adhesive glue between the cords and the back.

[0011] In the engine belt driving system according to the present invention, wherein the engine belt driving system is applied to a non-hybrid power system, the ropes of the first belt and the second belt are nylon ropes.

[0012] In the engine belt driving system according to the present invention, the first belt and the second belt do not pass through a tensioning mechanism.

[0013] In the engine belt drive system according to the present invention, wherein the engine belt drive system is applied to a hybrid power system, the cord of the first belt is a nylon cord, and the cord of the second belt is an aramid and / or polyester cord.

[0014] In the engine belt driving system according to the present invention, the first belt does not pass through a tensioning mechanism, and the second belt passes through a tensioning mechanism.

[0015] The engine belt drive system according to the present invention further includes:

[0016] A pump pulley, which is connected to the pump power,

[0017] The crankshaft pulley is connected to the pump pulley through a third belt, and the third belt is a poly-V belt.

[0018] The pump is directly / indirectly connected to the engine block.

[0019] In the engine belt drive system according to the present invention, the crankshaft pulley is a vibration isolation pulley or a rubber torsional vibration damping pulley.

[0020] In the engine belt drive system according to the present invention, the motor pulley is a decoupling damping pulley or a rigid pulley.

[0021] Another aspect of the present invention provides a vehicle comprising an engine belt drive system according to any one of the above. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The disclosure of the present application will become more easily understood with reference to the accompanying drawings. It is easy for those skilled in the art to understand that these drawings are only for illustrative purposes and are not intended to limit the scope of protection of the present application. In addition, similar numbers in the drawings are used to represent similar components, among which:

[0023] Figure 1 is a schematic diagram of an engine belt drive system in the prior art;

[0024] Figure 2 is a schematic diagram of an embodiment of an engine belt drive system according to the present invention;

[0025] Figure 3 is a schematic diagram of an engine belt drive system in the prior art;

[0026] Figure 4 is a schematic diagram of an engine belt drive system in the prior art;

[0027] Figure 5is a schematic diagram of an embodiment of an engine belt drive system according to the present invention;

[0028] Figure 6 is a schematic diagram of an embodiment of an engine belt drive system according to the present invention;

[0029] Figure 7 is a schematic diagram of an embodiment of an engine belt drive system according to the present invention;

[0030] Figure 8 is a schematic diagram of a motor installation method according to an embodiment of the present invention;

[0031] Fig. 9 is a schematic diagram of a compressor installation method according to an embodiment of the present invention;

[0032] Fig.10 is a cross-sectional view of a decoupling vibration-damping pulley according to an embodiment of the present invention;

[0033] Fig.11 is a schematic diagram of a rigid pulley according to an embodiment of the present invention;

[0034] Fig.12 is a cross-sectional view of a vibration isolation pulley according to an embodiment of the present invention;

[0035] Fig.13 is a cross-sectional view of a rubber torsional vibration damping pulley according to an embodiment of the present invention;

[0036] Fig.14 is a cross-sectional view of a poly-V belt according to an embodiment of the present invention.

[0037] Explanation of the reference numerals: 10 crankshaft pulley, 101 vibration isolation pulley, 102 rubber torsional vibration damping pulley, 11 engine block, 111 motor mounting bolt, 112 compressor mounting stud, 113 compressor mounting nut, 114 compressor mounting bolt, 20 compressor pulley, 21 compressor, 30 motor pulley, 301 decoupling vibration damping pulley, 302 rigid pulley, 31 motor, 40 tensioning mechanism, 41 Alpha type tensioner, 42 Omega type tensioner, 50 belt, 51 first belt, 52 second belt, 53 third belt, 500 poly-V belt, 510 cord, 511 back, 512 wedge, 60 pump pulley. DETAILED DESCRIPTION

[0038] First of all, it should be noted that the following will illustrate the composition, characteristics and advantages of the engine belt drive system and the vehicle according to the present invention in an exemplary manner, but it should be understood that all descriptions are given for illustration only and should not be construed as limiting the present invention in any way. In this article, the technical terms "first" and "second" are only used for distinguishing purposes and are not intended to indicate their order and relative importance. The technical term "connected (or connected, etc.)" covers the direct connection of a specific component to another component and / or indirect connection to another component. In addition, unless otherwise clearly specified and limited, the dimensions, directions or positional relationships indicated by the technical terms "length", "width", "height", "upper", "top", "bottom" and the like are based on the dimensions, orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and cannot be understood as limiting the present invention.

[0039] In addition, for any single technical feature described or implied in the embodiments mentioned herein, or any single technical feature shown or implied in the drawings, the present invention still allows any combination or deletion between these technical features (or their equivalents) without any technical obstacles, thereby obtaining more other embodiments of the present invention that may not be directly mentioned herein. In addition, general matters known to those skilled in the art will not be repeated herein.

[0040] Conventional engine belt drive systems transmit the power of the crankshaft to the motor and compressor through a single belt. In a specific embodiment, a belt is passed around the crankshaft pulley, the motor pulley and the compressor pulley. In order to ensure the tension, a tensioner is usually provided to provide stable tension for the system. During the life cycle of the vehicle, the engine system will be repeated hundreds of thousands of times under different operating conditions (start-stop, engine drive, motor assist in hybrid power system, brake energy recovery, etc.), which places high demands on the durability of the belt. Each pulley is subjected to a large radial force (especially in hybrid power system), which is also a test for the life of the pulley bearing, especially the air conditioning compressor pulley bearing at the close side of the system.

[0041] See also Figure 1 and Figure 2 , Figure 1 An example of an engine belt drive system of a non-hybrid power system in the prior art is shown. The belt 50 is wound around the crankshaft pulley 10, the compressor pulley 20, and the motor pulley 30, and the tensioning mechanism 40 is used to tension the system. The tensioning mechanism can be any suitable type of tensioning mechanism such as an automatic mechanical tensioner. Figure 2 is an embodiment of the engine belt system according to the present invention, which is relative to Figure 1The solution in the embodiment has two belts, namely a first belt 51 and a second belt 52, the first belt 51 passes around the crankshaft pulley 10 and the compressor pulley 20 to connect their power, and the second pulley 52 passes around the crankshaft pulley 10 and the motor pulley 30 to connect their power. Preferably, Figure 2 The first belt 51 and the second belt 52 in the embodiment are poly-V belts with nylon cords, which can provide sufficient tension for the system. Figure 1 The system in Figure 2 The solution in the embodiment adopts double belt drive, which can reduce the load of the motor pulley 30 and the compressor pulley 20, improve the reliability and life of the components, and the nylon cord poly-V belt provides sufficient tensioning force, eliminating the tensioning mechanism 40, thereby reducing costs.

[0042] The current hybrid systems include mild hybrid engines represented by 48V BSG (Belt Starter Generator) and strong hybrid engines represented by HEV (Hybrid Electric Vehicle) / PHEV (Plug-in Hybrid Electric Vehicle) / EREV (Extended Range Electric Vehicle). The motor in the non-hybrid system of the transmission only has the function of generating electricity, while in the 48V BSG system, the motor not only has the function of generating electricity, but also has the functions of starting and stopping the engine, providing power to the engine, and braking energy recovery. All these functions are realized through the belt drive system, which puts higher requirements on the belt drive system.

[0043] Figure 3 The invention is an example of an engine belt drive system of a hybrid system in the prior art, wherein the crankshaft pulley 20 is connected to the motor pulley and the compressor pulley 20 by a belt 50, and the tensioning mechanism applies tension to the system. Figure 3 In the example of FIG. 4 , the tensioning mechanism is an Alpha type tensioner 41, the motor pulley is connected to the motor 31, and the compressor pulley 20 is connected to the compressor 21. The compressor 21 is preferably an air conditioning compressor. Figure 4 is another example of an engine belt drive system of a hybrid system in the prior art. Figure 3 The examples shown in the drawings are all single belt driven motors and compressors, where the tensioning mechanism is an Omega type tensioner 42.

[0044] Figure 5 Yes Figure 3An improvement of the engine belt drive system of the example in which the crankshaft pulley 10 is connected to the compressor pulley 20 of the compressor 21 by a first belt 51, and the crankshaft pulley 10 is connected to the motor pulley of the motor 31 by a second belt 52. Figure 3 In terms of Figure 5 The crankshaft pulley drives the motor and the compressor respectively through two belts, which reduces the load on the bearings of the motor and the compressor. The first belt 51 preferably adopts a poly-V belt with nylon cord, and the first belt 51 does not require a tensioning mechanism. Figure 6 Yes Figure 4 An improvement of the engine belt drive system in which the crankshaft pulley 10 is connected to the compressor pulley 20 of the compressor 21 by a first belt 51, and the crankshaft pulley 10 is connected to the motor pulley of the motor 31 by a second belt 52. Figure 5 , Figure 6 The system in the embodiment uses two belts to drive the motor and the compressor respectively, which reduces the axial load of the motor and the compressor. The first belt 51 preferably uses a nylon cord poly-V belt, so there is no need to set a tensioning mechanism. Preferably, Figure 5 and Figure 6 The first belt 51 in the embodiment is a poly-V belt, and the poly-V belt does not use nylon cords, but preferably uses aramid or polyester cords.

[0045] Figure 7 A schematic diagram showing an embodiment of an engine belt drive system according to the present invention is shown. In addition to driving the motor and the compressor, the engine belt drive system can also drive a pump, such as a water pump / mechanical water pump. Figure 7 Schematic diagram of the engine belt drive system regarding the drive of the pump is shown in the figure, the crankshaft pulley 10 is connected to the pump pulley 60 through the third belt 53, wherein the third belt 53 is preferably a poly-V belt, more preferably a poly-V belt with nylon cord.

[0046] According to an embodiment of the present invention, one or more accessories in the engine belt drive system can also be directly installed on the cylinder block of the engine, that is, there is no need to indirectly install them on the cylinder block through a mounting structure such as a bracket. This arrangement is beneficial to the stability of the system and reduces vibration and noise, and can also reduce costs and save space. Figure 8 , the motor 31 is directly fixed to the engine block 11 through two motor mounting bolts 111; Fig. 9The compressor 21 is directly connected to the engine block 11 through two compressor mounting bolts 114, a compressor mounting stud 112 and a compressor mounting nut. It should be understood that the number, arrangement and combination of the studs, bolts, nuts, etc. described herein are only exemplary, and the direct connection method is also exemplary. The crankshaft pulley is connected to the motor 31 and the compressor 21 through two belts, respectively, which can facilitate the direct installation of the motor 31 and the compressor 21 on the engine block 11, and the elimination of the tensioning mechanism simplifies the system composition, which is also conducive to the direct installation of the motor and the compressor on the engine block.

[0047] The motor pulley can be Fig.10 The decoupling damping pulley 301 shown in Fig.11 The rigid pulley 302 shown in the figure. The decoupling vibration-damping pulley 301 has structures such as a one-way clutch unit and a vibration-damping spring. When the engine decelerates suddenly, the one-way clutch unit is activated to release the coupling between the pulley and the motor rotor, so that the generator rotor can rotate relatively freely and avoid the resonance of the vibration-damping spring; the vibration-damping spring is used to attenuate vibration, reduce the impact of motor speed fluctuations on the belt drive system, and reduce the first-order natural frequency of the belt drive system to below idle speed. When the rotational inertia of the motor is large, a decoupling vibration-damping pulley 301 can often be selected to overcome the NVH (Noise, Vibration, Harshness) problem in the system. When the rotational inertia of the motor is small, a rigid pulley 302 can be used, which has a simple structure and low cost compared to the decoupling vibration-damping pulley 301.

[0048] The crankshaft pulley 10 can be Fig.12 The vibration isolation pulley 101 shown in Fig.13 The rubber torsional vibration damping pulley 102 shown in FIG. The vibration isolation pulley is usually composed of a two-stage stiffness spring, which can attenuate the crankshaft speed fluctuation input to the belt drive system and reduce the excitation of the engine crankshaft speed fluctuation on the belt drive system. If the system can achieve better NVH performance without using the vibration isolation pulley 101 (for example, through dynamic calculation and vehicle performance testing), then Fig.13 The rubber torsional vibration damping pulley 102 replaces the vibration isolation pulley 101, thereby reducing costs.

[0049] Fig.14A schematic diagram of a poly-V belt 500 is shown, which includes a back 511, a plurality of wedges 512 and one or more cords 510. The poly-V belt has a back 511 on a first side, a plurality of wedges 512 are provided on a second side opposite to the first side, and one or more cords 510 are provided between the first side and the second side. The poly-V belt 500 can be used for any poly-V belt described above. The back 511 and the wedges 512 of the poly-V belt 500 can be made of rubber, preferably EPDM rubber. The cords 510 can be made of nylon and / or polyester and / or aramid.

[0050] The specific embodiments described above in this application are only for more clearly describing the principles of this application, wherein each component is clearly shown or described to make the principles of the present invention easier to understand. Without departing from the scope of this application, those skilled in the art can easily make various modifications or changes to this application. Therefore, it should be understood that these modifications or changes should be included in the scope of patent protection of this application.

Claims

1. An engine belt drive system, comprising: Crankshaft pulley; a compressor pulley, the crankshaft pulley being dynamically connected to the compressor pulley via a first belt; A motor pulley, wherein the crankshaft pulley is dynamically connected to the motor pulley via a second belt; The first belt and the second belt are poly-V belts; The compressor and / or the electric motor are directly connected to the engine block.

2. The engine belt drive system according to claim 1, wherein: The poly-V belt includes a cord, a back and a plurality of wedge portions, wherein the first side of the poly-V belt has a back, and the second side of the poly-V belt opposite to the first side is provided with a plurality of wedge portions, and one or more cords are provided between the first side and the second side, and the cords of the first belt and / or the second belt are nylon cords, and the back and the wedge portions are made of EPDM rubber, and there is adhesive glue between the cords and the back.

3. The engine belt drive system according to claim 1, wherein: The engine belt drive system is applied to a non-hybrid power system, and the ropes of the first belt and the second belt are nylon ropes.

4. The engine belt drive system according to claim 3, wherein: The first belt and the second belt do not pass through a tensioning mechanism.

5. The engine belt drive system according to claim 1, wherein: The engine belt drive system is applied to a hybrid power system, the cord of the first belt is a nylon cord, and the cord of the second belt is an aramid and / or polyester cord.

6. The engine belt drive system according to claim 5, wherein: The first belt does not pass through the tensioning mechanism, while the second belt passes through the tensioning mechanism.

7. The engine belt drive system according to claim 1 further comprising, A pump pulley, which is connected to the pump power, The crankshaft pulley is connected to the pump pulley through a third belt, and the third belt is a poly-V belt. The pump is directly / indirectly connected to the engine block.

8. The engine belt drive system according to claim 1, wherein: The crankshaft pulley is a vibration isolation pulley or a rubber torsion vibration damping pulley.

9. The engine belt drive system according to claim 1, wherein: The motor pulley is a decoupling vibration-damping pulley or a rigid pulley.

10. A vehicle comprising an engine belt drive system according to any one of claims 1-9.

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