Power split hybrid power speed change mechanism

Abstract

The invention discloses a power split hybrid power speed change mechanism which comprises an engine crankshaft, a torsion damper is installed at one end of the engine crankshaft, one end of the torsion damper is in transmission connection with an input shaft, and a planetary power split structure is fixedly connected to the input shaft. Power input by an engine crankshaft is divided through a planetary power dividing structure, part of the power is independently generated, part of the power is used for driving a vehicle, one end of the planetary power dividing structure is connected with a gear ring output shaft, the gear ring output shaft is fixedly connected with a power output shaft, and the gear ring output shaft is fixedly connected with a speed reduction driving part. Oil can be saved in all working conditions and all regions; a gear shifting system is omitted, the structure is simple, and cost is low; the integration level is high, the efficiency of the whole hybrid power system is improved, meanwhile, the failure risk of the connecting structure is reduced, and the system reliability is high.

Description

Technical Field

[0001] The present invention belongs to the technical field of hybrid power, and more specifically, particularly relates to a power split hybrid power transmission mechanism. Background Art

[0002] At present, in traditional hybrid vehicles, the power distribution method of the engine and the motor is often relatively fixed, which makes it difficult to achieve optimal efficiency under all working conditions, resulting in the following problems that need to be solved: 1. my country's new energy vehicle industry started late and the market application is not mature enough. Many hybrid transmission solutions cannot achieve the goal of fuel saving in all working conditions and all regions.

[0003] 2. The hybrid transmission solutions on the market have complex structures, high costs and are difficult to mass-produce, or the costs cannot be recovered for a long time after production.

[0004] 3. Most hybrid solutions have low integration, which not only results in low system efficiency, but also easily causes the risk of failure of the connected parts. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides a power split hybrid power transmission mechanism to solve the problems raised in the above background technology.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a power-split hybrid transmission mechanism, including an engine crankshaft, a torsional damper is installed at one end of the engine crankshaft, one end of the torsional damper is connected to the input shaft for transmission, a planetary power split structure is fixedly connected to the input shaft, the power input to the engine crankshaft is split through the planetary power split structure, part of it is used for independent power generation, and part of it is used to drive the vehicle, one end of the planetary power split structure is connected to a ring gear output shaft, the ring gear output shaft is fixedly connected to the power output shaft, and a reduction drive unit is fixedly connected to the ring gear output shaft.

[0007] As an optional solution of the present invention, the planetary power split structure includes a first planet carrier, which is fixedly connected to the input shaft, and the first planet carrier is connected to multiple sets of planetary gears. The inner sides of the multiple sets of planetary gears are meshed with the first sun gear for transmission, and the outer sides are meshed with the first ring gear for transmission.

[0008] As an optional solution of the present invention, a generator is also connected to the first sun gear, and an electromagnetic clutch is installed on the generator to brake the generator through the electromagnetic clutch.

[0009] As an optional solution of the present invention, one end of the first ring gear is fixedly connected to the ring gear output shaft.

[0010] As an optional solution of the present invention, the reduction drive unit includes a second planetary carrier, the second planetary carrier is fixedly connected to the ring gear output shaft, the second planetary carrier is connected to multiple groups of planetary gears, the multiple groups of planetary gears are meshed with the second sun gear on the inner side and meshed with the second ring gear on the outer side, and the second ring gear reduction drive unit is an outer casing.

[0011] As an optional solution of the present invention, the second sun gear is further connected to a drive motor, and is electrically driven by the drive motor.

[0012] The present invention provides a power split hybrid power transmission mechanism, which has the following beneficial effects: The overall layout of the present invention has no shifting system, simple structure, low cost, and can save fuel in all working conditions and all regions; The present invention has a high degree of integration, integrating a hybrid power controller and an oil cooling system, improving the efficiency of the entire hybrid power system, while reducing the risk of connection structure failure, and the system has high reliability; The present invention adopts a generator brake device, and when the vehicle is running at high speed, the engine directly drives the vehicle without energy conversion loss; The present invention adopts an electronic oil pump to supply oil, the oil pump speed is decoupled from the vehicle speed, the cooling and lubrication are accurately controlled, and the system efficiency is high; The present invention adopts a planetary device for power distribution and speed change, so that the structural scheme is more compact, which is convenient for the layout of the whole vehicle and can also reduce the product manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a power transmission route map in the pure electric working mode of the present invention; Figure 3 The present invention is a power transmission route map in a hybrid power working mode; Figure 4 The present invention is a power transmission route map for the engine in direct drive working mode.

[0014] In the figure: 1. engine crankshaft; 2. torsional vibration damper; 3. input shaft; 4. electromagnetic clutch; 5. generator; 6. first sun gear; 7. first planetary carrier; 8. first ring gear; 9. ring gear output shaft; 10. drive motor; 11. second sun gear; 12. first planetary carrier; 13. second ring gear; 14. power output shaft. DETAILED DESCRIPTION

[0015] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0016] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] See also Figures 1 to 4 The present invention provides a technical solution: a power-split hybrid power transmission mechanism, including an engine crankshaft 1, a torsion damper is installed at one end of the engine crankshaft 1, one end of the torsion damper 2 is connected to the input shaft 3 for transmission, a planetary power split structure is fixedly connected to the input shaft 3, the power input to the engine crankshaft 1 is split through the planetary power split structure, part of it is used for independent power generation, and part of it is used to drive the vehicle, one end of the planetary power split structure is connected to a ring gear output shaft 9, the ring gear output shaft 9 is fixedly connected to the power output shaft 14, and a reduction drive unit is fixedly connected to the ring gear output shaft 9.

[0019] The planetary power split structure includes a first planet carrier 7, which is fixedly connected to the input shaft 3. The first planet carrier 7 is connected to multiple sets of planetary gears, and the inner sides of the multiple sets of planetary gears are meshed with the first sun gear 6 for transmission, and the outer sides are meshed with the first ring gear 8 for transmission.

[0020] The first sun gear 6 is also connected to a generator 5 , on which an electromagnetic clutch 4 is mounted, so that the generator 5 is braked by the electromagnetic clutch 4 .

[0021] One end of the first ring gear 8 is fixedly connected to the ring gear output shaft 9 .

[0022] The reduction drive unit includes a second planetary carrier 12, which is fixedly connected to the ring gear output shaft 9. The second planetary carrier 12 is connected to multiple sets of planetary gears. The inner sides of the multiple sets of planetary gears are meshed with the second sun gear 11 for transmission, and the outer sides are meshed with the second ring gear 13 for transmission. The second ring gear 13 is the outer shell of the reduction drive unit.

[0023] The second sun gear 11 is also connected to a drive motor 10 , and is electrically driven by the drive motor 10 .

[0024] After the vehicle is started, the following three modes are used to drive the vehicle according to actual needs: Pure electric working mode: like Figure 2 Shown is the power transmission route in pure electric working mode; When the vehicle starts, the driving motor 10 drives the second sun gear 11 to rotate. Since the second ring gear 13 is fixed, the power of the second sun gear 11 is output through the second planetary carrier 12 and the power output shaft 14, thereby driving the vehicle to travel. The reverse operation is achieved by driving the motor 10 in reverse.

[0025] Hybrid working mode: like Figure 3 The power transmission route in the hybrid operation mode is shown; When the vehicle is traveling at medium and low speeds, a hybrid power working mode is adopted. The power of the engine is divided at the first planetary carrier 7 through the engine crankshaft 1, the torsional vibration damper 2, and the input shaft 3. A part of it is driven by the first sun gear 6 to drive the generator 5 to generate electricity; a part of it is output through the first ring gear 8, the ring gear output shaft 9 and the power output shaft 14. At the same time, the driving motor 10 drives the second sun gear 11 to rotate. Since the position of the second ring gear 13 is fixed, the power of the second sun gear 11 is output in parallel through the second planetary carrier 12 and the power output shaft 14, thereby driving the vehicle to travel.

[0026] Engine direct drive working mode: like Figure 4 The figure shows the power transmission route in the engine direct drive working mode. When the vehicle is traveling at high speed, the engine is in a high-efficiency working area and adopts a direct drive working mode. The electromagnetic clutch 4 works to lock the generator 5. The power of the engine is transmitted through the engine crankshaft 1 and the torsional vibration damper 2 to the input shaft 3. The input shaft 3 then drives the first planetary carrier 7, the first ring gear 8, the ring gear output shaft 9 and the power output shaft 14 to output and directly drive the vehicle to travel.

[0027] In addition, the present invention adopts a mechanical pump and an electronic pump to jointly provide cooling lubricating oil. The mechanical pump supplies oil at low temperature or when the engine is working, and the motor pump supplies oil when the vehicle is in pure electric mode or in reverse mode. The oil supply efficiency is high and the system efficiency is high.

[0028] The present invention integrates a motor controller and a cooling and heat dissipation system, the hybrid power system has high efficiency, low risk of connection structure failure, and high system reliability.

[0029] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A power split hybrid transmission mechanism, characterized in that: The invention comprises an engine crankshaft (1), one end of which is provided with a torsional vibration damper, one end of which is connected to an input shaft (3) for transmission, the input shaft (3) being fixedly connected with a planetary power splitting structure, the power inputted from the engine crankshaft (1) being split by the planetary power splitting structure, part of which is used for independent power generation and part of which is used for driving a vehicle, one end of the planetary power splitting structure being connected with a ring gear output shaft (9), the ring gear output shaft (9) being fixedly connected to a power output shaft (14), and a speed reduction driving unit being fixedly connected to the ring gear output shaft (9).

2. A power split hybrid transmission mechanism according to claim 1, characterized in that: The planetary power splitting structure comprises a first planet carrier (7), the first planet carrier (7) being fixedly connected to the input shaft (3), the first planet carrier (7) being connected to a plurality of sets of planetary gears, the inner sides of the plurality of sets of planetary gears being meshed with the first sun gear (6) for transmission, and the outer sides of the plurality of sets of planetary gears being meshed with the first gear ring (8) for transmission.

3. A power split hybrid transmission mechanism according to claim 2, characterized in that: The first sun gear (6) is also connected to a generator (5), and an electromagnetic clutch (4) is mounted on the generator (5), so that the generator (5) is braked by the electromagnetic clutch (4).

4. A power split hybrid transmission mechanism according to claim 2, characterized in that: One end of the first gear ring (8) is fixedly connected to the gear ring output shaft (9).

5. A power split hybrid transmission mechanism according to claim 1, wherein the reduction drive unit comprises a second planetary carrier (12), the second planetary carrier (12) is fixedly connected to the ring gear output shaft (9), the second planetary carrier (12) is connected to a plurality of sets of planetary gears, the inner sides of the plurality of sets of planetary gears are meshed with the second sun gear (11) for transmission, and the outer sides are meshed with the second ring gear (13) for transmission, and the second ring gear (13) is fixed to the housing of the reduction drive unit.

6. A power split hybrid transmission mechanism according to claim 5, characterized in that: The second sun gear (11) is also connected to a drive motor (10) and is electrically driven by the drive motor (10).

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