Commercial vehicle BSG medium-voltage hybrid engine and medium-voltage hybrid vehicle

Abstract

The invention relates to the technical field of engines, in particular to a commercial vehicle BSG medium-voltage hybrid engine and a medium-voltage hybrid automobile, comprising an engine body, a BSG motor, a transmission belt, a wrap angle adjusting device and a tensioning unit; the wrap angle adjusting device comprises an adjusting base, an electric driving piece arranged on the adjusting base, two adjusting sliding blocks arranged at the two ends of the adjusting base in a sliding mode and two adjusting belt wheels rotationally arranged at the two ends of the adjusting base. Two adjusting rollers which are in transmission connection with the adjusting sliding blocks are movably arranged at the two ends of the adjusting seat on the outer side of the transmission belt; the BSG motor and the electric driving part are electrically connected in series; the tensioning unit comprises a tensioning belt wheel movably arranged on the side wall of the engine body. The transmission belt is wound on the driving belt wheel, the driven belt wheel, the adjusting belt wheel and the tensioning belt wheel; the two adjusting rollers mutually move in the circumferential direction of the adjusting belt wheel, so that the wrap angle of the transmission belt to the adjusting belt wheel is increased or decreased, and the transmission requirement of the high-load or low-load working condition is met.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more specifically to a commercial vehicle BSG medium-pressure hybrid engine and a medium-pressure hybrid vehicle. Background Technology

[0002] With the escalating global energy crisis and increasingly stringent environmental regulations, commercial vehicles, as core equipment in the transportation sector, face a growing need for energy conservation and emission reduction. Hybridization has become one of the core paths for upgrading commercial vehicle technology. Among them, the BSG (Belt-driven Starter Generator) hybrid system is widely used in commercial vehicle power upgrade solutions due to its advantages such as compact structure, low modification cost, and strong adaptability.

[0003] In existing BSG hybrid systems, the BSG motor is connected to the engine via a belt to achieve power coupling. However, the belt has a limited torque capacity and cannot be adapted to the high torque scenarios of medium-voltage (200V) hybrids. Summary of the Invention

[0004] The purpose of this invention is to overcome the aforementioned shortcomings and provide a BSG medium-pressure hybrid engine for commercial vehicles and a medium-pressure hybrid vehicle. To achieve the above objective, the specific solution of this invention is as follows: The present invention provides a commercial vehicle BSG medium-pressure hybrid engine, including an engine body, a BSG motor, a transmission belt, a wrap angle adjustment device, and a tensioning unit; the side wall of the engine body is rotatably provided with multiple driven pulleys; the crankshaft of the engine body is fixedly sleeved with a driving pulley; The wrap angle adjustment device includes an adjustment seat located on the side wall of the engine body, an electric drive component located on the adjustment seat, two adjustment sliders slidably located at both ends of the adjustment seat, and two adjustment pulleys rotatably located at both ends of the adjustment seat; both ends of the adjustment seat are provided with two adjustment rollers that are movably connected to the adjustment sliders on the outside of the transmission belt. The BSG motor is located at one end of the adjusting seat and connected to the corresponding adjusting pulley; the BSG motor and the electric drive component are electrically connected in series; the tensioning unit includes a tensioning pulley movably located on the side wall of the engine body; the transmission belt is wound around the driving pulley, the driven pulley, the adjusting pulley and the tensioning pulley; When the electric drive causes the two adjusting sliders to move synchronously towards each other, the adjusting sliders drive the corresponding two adjusting rollers to move and cause the two adjusting rollers to move away from each other along the circumference of the corresponding adjusting pulleys, so as to increase the wrap angle of the transmission belt on the adjusting pulleys.

[0005] In some embodiments, two roller supports are rotatably provided at both ends of the adjusting seat; each roller support is provided with an adjusting shaft on the outside of the transmission belt, which is movably hinged to the adjusting slider located at the same end; the adjusting roller is sleeved on the outer peripheral wall of the corresponding adjusting shaft.

[0006] In some embodiments, the adjusting slider is provided with a strip-shaped hole; the end of the adjusting shaft is movably embedded in the strip-shaped hole.

[0007] In some embodiments, the roller support includes an annular support body and an extension arm extending radially from the outer peripheral wall of the annular support body; the adjusting shaft is fixedly connected to the end of the extension arm.

[0008] In some embodiments, the adjusting seat is provided with a sliding groove; the adjusting slider is slidably disposed in the sliding groove; and the electric drive component is disposed in the middle of the sliding groove.

[0009] In some embodiments, guide shafts are provided at both ends of the groove; the adjusting slider is slidably sleeved on the outer peripheral wall of the guide shaft.

[0010] In some embodiments, the tensioning unit further includes a guide frame fixed to the side wall of the engine body and a tensioning slider slidably disposed on the guide frame; a tensioning spring is connected between the tensioning slider and the guide frame; and the tensioning pulley is rotatably disposed on the tensioning slider.

[0011] In some embodiments, the electric drive is an electromagnet; the adjusting slider is made of a soft magnetic material.

[0012] In some embodiments, the electric drive is a screw motor, which has two screw output shafts with opposite thread directions; two adjusting sliders are respectively threaded onto the outer peripheral walls of the two screw output shafts, so that when the screw motor is working, the two adjusting sliders are driven to move synchronously towards each other through the screw output shafts.

[0013] Another aspect of the present invention provides a medium-pressure hybrid vehicle, including the commercial vehicle BSG medium-pressure hybrid engine as described above.

[0014] The beneficial effects of this invention are as follows: By setting a tensioning unit at the pulley of a high-power unit such as a BSG motor to dynamically adjust the pulley wrap angle and belt tension according to the load, the electric drive component is connected in series with the BSG motor. The pulley wrap angle and the transmission belt tension are adjusted in real time according to the output load of the BSG motor. Thus, under low load conditions, the pulley wrap angle is adjusted to be small and the transmission belt tension is low, which can reduce the resistance of the entire system and improve the transmission efficiency while ensuring the transmission torque. Under high load conditions, the pulley wrap angle is large and the transmission belt tension is high, which can realize high torque transmission, thus meeting the high torque transmission requirements of medium-voltage hybrid commercial vehicles. Attached Figure Description

[0015] Figure 1 This is a perspective view of the hybrid engine provided in Embodiment 1 of the present invention under low load conditions; Figure 2 This is a perspective view of the hybrid engine under high load conditions provided in Embodiment 1 of the present invention; Figure 3 This is a perspective view of the combination of the wrap angle adjustment device, BSG motor, and compressor provided in Embodiment 1 of the present invention; Figure 4 This is a perspective view of the tensioning unit provided in Embodiment 1 of the present invention; Figure 5 This is a schematic diagram of the structure of the adjusting seat, roller bracket, and adjusting roller assembly provided in Embodiment 1 of the present invention; Figure 6 This is a perspective view of the hybrid engine under high load conditions provided in Embodiment 2 of the present invention; Figure 7 This is a perspective view of the combination of the wrap angle adjustment device, BSG motor, and compressor provided in Embodiment 2 of the present invention; Explanation of reference numerals in the attached drawings: 1. Engine body; 11. Crankshaft; 12. Drive pulley; 13. Driven pulley; 2. BSG motor; 3. Drive belt; 41. Adjusting seat; 411. Slide groove; 412. Guide shaft; 42. Electric drive component; 43. Adjusting slider; 431. Strip hole; 44. Adjusting pulley; 45. Roller bracket; 451. Annular bracket body; 452. Extension arm; 453. Adjusting shaft; 46. Adjusting roller; 51. Guide frame; 52. Tensioning slider; 53. Tensioning pulley; 54. Tensioning spring; 6. Compressor. Detailed Implementation

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, but this is not to limit the scope of the invention to this.

[0017] Example 1: Refer to Figures 1 to 5 As shown in this embodiment, a commercial vehicle BSG medium-pressure hybrid engine, through the structural design of the wrap angle adjustment device, increases the wrap angle between the transmission belt 3 and the adjusting pulley 44 under high load conditions, thereby improving the torque carrying capacity of the transmission belt 3 to adapt to the high torque application scenario of medium-pressure (200V) hybrid and adapt to the high load conditions; under low load conditions, it decreases the wrap angle between the transmission belt 3 and the adjusting pulley 44 to reduce the operating resistance of the entire transmission system, improve transmission efficiency, and adapt to the low load conditions.

[0018] Specifically, the commercial vehicle BSG medium-pressure hybrid engine includes an engine body 1, a BSG motor 2, a transmission belt 3, a wrap angle adjustment device, and a tensioning unit; the side wall of the engine body 1 is rotatably provided with multiple driven pulleys 13, and the crankshaft 11 of the engine body 1 is fixedly sleeved with a drive pulley 12, which is mainly used to transmit the power of the crankshaft 11 of the hybrid engine to the transmission belt 3. Reference Figures 1 to 3 The corner adjustment device includes an adjustment seat 41, an electric drive unit 42, two adjustment sliders 43, and two adjustment pulleys 44. The adjustment seat 41 is fixedly installed on the side wall of the engine body 1. A groove 411 is provided on the adjustment seat 41. The electric drive unit 42 is fixedly disposed in the middle of the groove 411. The two adjustment sliders 43 are respectively slidably disposed at both ends of the groove 411. Two guide shafts 412 are also provided at intervals at both ends of the groove 411. The adjustment sliders 43 are slidably sleeved on the outer peripheral wall of the guide shafts 412. The guide shafts 412 accurately guide the sliding direction of the adjustment sliders 43, preventing the adjustment sliders 43 from deviating during the sliding process. In this embodiment, the electric drive unit 42 is an electromagnet, and the adjustment sliders 43 are made of soft magnetic materials (such as low carbon steel, ferrite, silicon steel, or soft magnetic composite materials). The magnetic attraction force of the electromagnet after it is energized drives the adjustment sliders 43 to move, which is responsive and compact.

[0019] Reference Figures 1 to 4 Two roller supports 45 are rotatably mounted at both ends of the adjusting seat 41. Each roller support 45 includes an annular support body 451 and an extension arm 452 extending radially from the outer peripheral wall of the annular support body 451. An adjusting shaft 453 is fixedly connected to the end of the extension arm 452. An adjusting shaft 453 is provided on the outside of the transmission belt 3 of each roller support 45. The adjusting shaft 453 is movably hinged to the adjusting slider 43 located at the same end. Specifically, the adjusting slider 43 has a slotted hole 431. The end of the adjusting shaft 453 is movably embedded in the slotted hole 431. Through the cooperation between the slotted hole 431 and the adjusting shaft 453, the transmission connection between the adjusting slider 43 and the roller support 45 is realized, and the adjusting shaft 453 is allowed to move within a certain range within the slotted hole 431 to adapt to angle changes during the adjustment process. The adjusting roller 46 is sleeved on the outer peripheral wall of the corresponding adjusting shaft 453. The adjusting roller 46 is in contact with the outer side wall of the transmission belt 3 and is used to adjust the wrap angle of the transmission belt 3 on the adjusting pulley 44.

[0020] Refer to 1 to Figure 3The BSG motor 2 is located at one end of the adjusting seat 41, and its output end is connected to one of the corresponding adjusting pulleys 44. This allows the BSG motor 2 to transmit power to the drive belt 3 via the adjusting pulley 44, while the drive belt 3 also transmits power from the engine body 1 to the BSG motor 2, achieving bidirectional power coupling. In some embodiments, the other end of the adjusting seat 41 is equipped with a compressor 6 (i.e., a load). The input end of the compressor 6 is connected to another corresponding adjusting pulley 44, thereby transmitting power to the compressor 6 via the drive belt 3 and the corresponding adjusting pulley 44, driving the compressor 6 to operate. The BSG motor 2 and the electric drive unit 42 are electrically connected in series to ensure coordinated power supply and control, guaranteeing the synchronicity of adjustment action and power transmission. During startup or high-load conditions, the current flowing through the BSG motor 2 increases. Because the BSG motor 2 and the electric drive unit 42 (electromagnet) are connected in series, the current flowing through the electric drive unit 42 increases synchronously, strengthening the magnetic attraction on the adjusting slider 43. This drives the adjusting sliders 43 located at both ends of the adjusting seat 41 to move synchronously towards each other along the guide shaft 412. Through the transmission cooperation between the strip hole 431 and the adjusting shaft 453, the corresponding roller bracket 45 rotates around its pivot point, causing the two adjusting rollers 46 at the ends of each adjusting seat 41 to move away from each other along the circumference of the corresponding adjusting pulley 44. Figure 2 As shown, this expands the contact range of the transmission belt 3 on the adjusting pulley 44, that is, increases the wrap angle of the transmission belt 3 on the adjusting pulley 44, and increases the friction between the transmission belt 3 and the adjusting pulley 44 to meet the requirements of high torque transmission and adapt to the working conditions with high load. As the load decreases, the current flowing through the BSG motor 2 decreases accordingly, and the current flowing through the electric drive component 42 decreases synchronously, weakening its magnetic attraction to the adjusting slider 43. At this time, the elastic tension of the transmission belt 3 acts in the opposite direction on the adjusting rollers 46, pushing the two adjusting rollers 46 closer together along the circumference of the adjusting pulley 44. This, in turn, through the cooperation of the adjusting shaft 453 and the slotted hole 431, causes the adjusting slider 43 to move away from the electric drive component 42 along the guide shaft 412, resetting the adjusting slider 43 to near its initial position. Figure 1 As shown, the contact range of the transmission belt 3 on the adjusting pulley 44 is reduced, and the wrap angle is decreased. While ensuring the basic transmission torque, the operating resistance of the entire transmission system is reduced, and the transmission efficiency is improved to adapt to the working conditions with small loads.

[0021] Reference Figure 1The tensioning unit is used to maintain the tension of the transmission belt 3, and includes a tensioning pulley 53, a guide frame 51, a tensioning slider 52, and a tensioning spring 54. The guide frame 51 is fixedly mounted on the side wall of the engine body 1, the tensioning slider 52 is slidably mounted on the guide frame 51, the tensioning spring 54 is connected between the tensioning slider 52 and the guide frame 51, and the tensioning pulley 53 is rotatably mounted on the tensioning slider 52.

[0022] Reference Figure 1 and Figure 2 The transmission belt 3 is wound around the driving pulley 12, the driven pulley 13, the adjusting pulley 44, and the tension pulley 53. The tension spring 54 always applies an elastic force to the tension slider 52, so that the tension pulley 53 always presses against the transmission belt 3, thereby ensuring the tension of the transmission belt 3 during the transmission process, avoiding slippage, and further ensuring transmission stability.

[0023] To further explain this embodiment, its working principle is as follows: When the torque carrying capacity of the transmission belt 3 needs to be increased (such as during high-load scenarios like starting and acceleration), the load on the BSG motor 2 increases, the energizing current rises, and the magnetic attraction force generated by the series-connected electric drive component 42 (electromagnet) increases synchronously, driving the two adjusting sliders 43 to move synchronously towards each other along the guide shaft 412. During the movement of the adjusting sliders 43 towards each other, the adjusting sliders 43, through the cooperation of the strip hole 431 and the adjusting shaft 453, drive the corresponding roller bracket 45 to rotate around its pivot point, thereby causing the two adjusting rollers 46 at the end of each adjusting seat 41 to overcome the tension of the transmission belt 3 and move away from each other along the circumference of the corresponding adjusting pulley 44. The away movement of the adjusting rollers 46 increases the contact range of the transmission belt 3 on the adjusting pulley 44, thereby increasing the wrap angle of the transmission belt 3 on the adjusting pulley 44. According to the mechanical principle of belt drive, increasing the wrap angle can significantly increase the friction between the transmission belt 3 and the adjusting pulley 44, thereby increasing the upper limit of torque transmission of the transmission belt 3, meeting the high torque transmission requirements in medium-pressure hybrid scenarios, and adapting to heavy load conditions.

[0024] When it is necessary to reduce the torque carrying capacity of the transmission belt 3 (such as low-load scenarios like constant speed driving), the load on the BSG motor 2 decreases, the current decreases, and the magnetic attraction of the electric drive component 42 weakens. At this time, the force exerted by the transmission belt 3 on the adjusting roller 46 is greater than the force exerted by the electric drive component 42 on the adjusting roller 46 through the adjusting slider 43. The elastic tension of the transmission belt 3 pushes the adjusting roller 46 closer to each other, causing the adjusting slider 43 to reset and the wrap angle to decrease. At this time, the resistance of the transmission system is reduced and the transmission efficiency is improved. At the same time, the tension spring 54 of the tensioning unit continues to act to ensure that the transmission belt 3 does not slip, taking into account both transmission efficiency and stability, and adapting to low-load working conditions.

[0025] Example 2: Reference Figure 6 and Figure 7 As shown, the difference between this embodiment and Embodiment 1 lies in the type and driving method of the electric drive component 42. The rest of the structure is consistent with Embodiment 1 to adapt to different installation scenarios and control requirements.

[0026] In this embodiment, the electric drive component 42 is a screw motor, which has two screw output shafts with opposite screw directions. Two adjusting sliders 43 are respectively threaded onto the outer peripheral walls of the two screw output shafts, and the adjusting sliders 43 are slidably engaged with the slide grooves 411 of the adjusting seat 41. The guide shafts 412 guide and limit the sliding of the adjusting sliders 43. Two guide shafts 412 are respectively provided at intervals at each end of the slide grooves 411 to prevent the adjusting sliders 43 from rotating synchronously with the screw output shafts.

[0027] When under high load conditions, and it is necessary to increase the wrap angle of the transmission belt 3 to the adjusting pulley 44, the screw motor starts and rotates in the forward direction. Since the threads of the two screw output shafts are in opposite directions, under the action of thread transmission, the two adjusting sliders 43 overcome the tension of the transmission belt 3 and move synchronously towards each other along the guide shaft 412. At the same time, through the adjusting shaft 453 and the roller bracket 45, the adjusting rollers 46 are driven to move away from each other, thereby increasing the wrap angle of the transmission belt 3 to the adjusting pulley 44 and improving the torque transmission capability. Its adjustment logic is the same as that of Embodiment 1.

[0028] When under low load conditions, the load on BSG motor 2 decreases, the current decreases, and the current of screw motor decreases. At this time, the force exerted by transmission belt 3 on adjusting roller 46 is greater than the force exerted by electric drive component 42 on adjusting roller 46 through adjusting slider 43. Transmission belt 3 applies force to adjusting roller 46, and the elastic tension of transmission belt 3 pushes adjusting roller 46 closer together, causing adjusting slider 43 to reset, screw output shaft reverses, and the wrap angle of transmission belt 3 on adjusting pulley 44 decreases, thereby reducing system operating resistance. At the same time, tensioning unit maintains the tension of transmission belt 3 to ensure transmission stability.

[0029] Example 3: Refer to Figures 1 to 7 As shown, this embodiment provides a medium-pressure hybrid vehicle, which includes the commercial vehicle BSG medium-pressure hybrid engine described in Embodiment 1 or Embodiment 2 above.

[0030] This embodiment applies the commercial vehicle BSG medium-pressure hybrid engine to medium-pressure hybrid vehicles, effectively solving the problem that existing BSG hybrid systems cannot adapt to the high torque scenarios of medium-pressure (200V) hybrids. Under high-load conditions such as vehicle start-up and acceleration, the torque transmission capacity is improved by increasing the 3-wrap angle of the drive belt to meet the vehicle's power requirements. Under low-load conditions such as constant-speed driving, the wrap angle is reduced to lower system resistance, improving fuel economy or energy utilization efficiency. At the same time, the tensioning unit ensures that the transmission process does not slip, guaranteeing the stability and reliability of vehicle driving and improving the overall performance of medium-pressure hybrid vehicles.

[0031] The above description is only a preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made to the structure, features and principles described in the claims of this patent application are included within the protection scope of this patent application.

Claims

1. A BSG medium-pressure hybrid engine for commercial vehicles, characterized in that, It includes an engine body, a BSG motor, a drive belt, a wrap angle adjustment device, and a tensioning unit; the side wall of the engine body is provided with multiple driven pulleys for rotation; the crankshaft of the engine body is fixedly sleeved with a drive pulley; The wrap angle adjustment device includes an adjustment seat located on the side wall of the engine body, an electric drive component located on the adjustment seat, two adjustment sliders slidably located at both ends of the adjustment seat, and two adjustment pulleys rotatably located at both ends of the adjustment seat; both ends of the adjustment seat are provided with two adjustment rollers that are movably connected to the adjustment sliders on the outside of the transmission belt. The BSG motor is located at one end of the adjusting seat and connected to the corresponding adjusting pulley; the BSG motor and the electric drive component are electrically connected in series; the tensioning unit includes a tensioning pulley movably located on the side wall of the engine body; The drive belt is wound around the driving pulley, driven pulley, adjusting pulley, and tension pulley; When the electric drive causes the two adjusting sliders to move synchronously towards each other, the adjusting sliders drive the corresponding two adjusting rollers to move and cause the two adjusting rollers to move away from each other along the circumference of the corresponding adjusting pulleys, so as to increase the wrap angle of the transmission belt on the adjusting pulleys.

2. The commercial vehicle BSG medium-pressure hybrid engine according to claim 1, characterized in that, Two roller supports are rotatably provided at both ends of the adjusting seat; each roller support has an adjusting shaft that is movably hinged to the adjusting slider located at the same end on the outside of the transmission belt; the adjusting roller is sleeved on the outer peripheral wall of the corresponding adjusting shaft.

3. The commercial vehicle BSG medium-pressure hybrid engine according to claim 2, characterized in that, The adjusting slider is provided with a strip-shaped hole; the end of the adjusting shaft is movably embedded in the strip-shaped hole.

4. The commercial vehicle BSG medium-pressure hybrid engine according to claim 2, characterized in that, The roller support includes an annular support body and an extension arm extending radially from the outer peripheral wall of the annular support body; the adjusting shaft is fixedly connected to the end of the extension arm.

5. The commercial vehicle BSG medium-pressure hybrid engine according to claim 1, characterized in that, The adjusting seat is provided with a sliding groove; the adjusting slider is slidably disposed in the sliding groove; the electric drive component is disposed in the middle of the sliding groove.

6. The commercial vehicle BSG medium-pressure hybrid engine according to claim 5, characterized in that, The groove has guide shafts at both ends; the adjusting slider is slidably sleeved on the outer peripheral wall of the guide shaft.

7. The commercial vehicle BSG medium-pressure hybrid engine according to claim 1, characterized in that, The tensioning unit also includes a guide frame fixed to the side wall of the engine body and a tensioning slider slidably disposed on the guide frame; a tensioning spring is connected between the tensioning slider and the guide frame; and the tensioning pulley is rotatably disposed on the tensioning slider.

8. The commercial vehicle BSG medium-pressure hybrid engine according to any one of claims 1 to 7, characterized in that, The electric drive component is an electromagnet; the adjusting slider is made of soft magnetic material.

9. The commercial vehicle BSG medium-pressure hybrid engine according to any one of claims 1 to 7, characterized in that, The electric drive component is a screw motor, which has two screw output shafts with opposite thread directions; two adjusting sliders are respectively threaded onto the outer peripheral walls of the two screw output shafts, so that when the screw motor is working, the two adjusting sliders are driven to move synchronously towards each other through the screw output shafts.

10. A medium-pressure hybrid vehicle, characterized in that, Including the commercial vehicle BSG medium-pressure hybrid engine as described in any one of claims 1 to 9.

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