Vehicle transmission mechanism and vehicle

Abstract

The present invention discloses a vehicle transmission mechanism and a vehicle, belonging to the field of vehicle technology. The vehicle transmission mechanism and the vehicle of the present invention, the vehicle transmission mechanism includes a planetary gear system arranged in one-to-one correspondence with the wheels, the planetary gear system includes a transmission planetary gear and a transmission sun gear, the transmission planetary gear is used to drive the corresponding wheel to rotate, the transmission planetary gear is rotatably arranged on the corresponding suspension; the transmission sun gear is rotatably arranged on the frame, the transmission sun gear is meshed with the transmission planetary gear, the transmission sun gear can drive the transmission planetary gear to rotate around its axis to drive the corresponding wheel to rotate, and the transmission sun gear can also drive the transmission planetary gear to revolve around the transmission sun gear to drive the corresponding suspension to swing around its pivot axis with the frame. The structure is simple, the cost is low, and the phenomenon of vehicle head-up and head-nodding caused by vehicle acceleration and braking is actively alleviated, thereby improving riding comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicles, and in particular to a vehicle transmission mechanism and a vehicle. Background Art

[0002] In recent years, the automobile industry has developed rapidly, the number of cars in cities has increased, and the use of passenger cars has shifted more toward cities. The characteristics of urban driving are that vehicles accelerate and brake more frequently. Since the center of mass of the vehicle is higher than the friction plane, every time the vehicle accelerates or brakes, it will cause the vehicle to raise its head or nod, affecting ride comfort.

[0003] At present, active suspension, semi-active suspension, air suspension and other solutions used by different manufacturers can achieve the control of suspension height to suppress the above phenomenon. However, active suspension has high energy consumption, complex structure, high cost, and complex control algorithm, and is not widely used at present; semi-active suspension mainly changes the damping characteristics of the suspension, and has a poor effect on low-frequency movement; air suspension can change the height of the vehicle body, but its control frequency is low and the cost is high, which makes it difficult to meet the requirements of real-time control. Summary of the invention

[0004] The object of the present invention is to provide a vehicle transmission mechanism and a vehicle, which can actively alleviate the phenomenon of vehicle head-up during acceleration and head-nodding during braking, and improve riding comfort.

[0005] In order to achieve the above objectives, the following technical solutions are provided:

[0006] On the one hand, a vehicle transmission mechanism is provided, which is used to drive a pair of wheels of a vehicle to rotate, wherein a suspension is provided between the two wheels and a frame, one end of the suspension is pivotally connected to the frame, and the other end is connected to the corresponding wheel;

[0007] The vehicle transmission mechanism includes a planetary gear train arranged in one-to-one correspondence with the wheels, and the planetary gear train includes:

[0008] A transmission planetary gear, used for driving the corresponding wheel to rotate, the transmission planetary gear being rotatably arranged on the corresponding suspension;

[0009] The transmission sun gear is rotatably disposed on the frame, and the transmission sun gear is meshed with the transmission planetary gears. The transmission sun gear can drive the transmission planetary gears to rotate around their axes to drive the corresponding wheels to rotate. The transmission sun gear can also drive the transmission planetary gears to revolve around the transmission sun gear to drive the corresponding suspension to swing around the pivot axis between it and the frame.

[0010] As an optional solution for the vehicle transmission mechanism, the wheel is located at one end of the vehicle close to the front of the vehicle;

[0011] When the driving torque of the wheel increases, the transmission sun gear can drive the corresponding transmission planetary gear to revolve around the transmission sun gear, so as to drive the corresponding suspension to swing upward around the pivot axis between the suspension and the frame;

[0012] When a fuel vehicle brakes through its engine or an electric vehicle or a hybrid vehicle recovers braking energy, the transmission sun gear can drive the corresponding transmission planetary gear to revolve around the transmission sun gear to drive the corresponding suspension to swing downward around its pivot axis with the frame.

[0013] As an optional solution for the vehicle transmission mechanism, the wheel is located at an end of the vehicle away from the front of the vehicle;

[0014] When the driving torque of the wheel increases, the transmission sun gear can drive the corresponding transmission planetary gear to revolve around the transmission sun gear, so as to drive the corresponding suspension to swing downward around the pivot axis between the suspension and the frame;

[0015] When a fuel vehicle brakes through its engine or an electric vehicle or a hybrid vehicle recovers braking energy, the transmission sun gear can drive the corresponding transmission planetary gear to revolve around the transmission sun gear, thereby driving the corresponding suspension to swing upward around its pivot axis with the frame.

[0016] As an optional solution for the vehicle transmission mechanism, the axis of the transmission planetary gear is perpendicular to the driving direction of the vehicle.

[0017] As an optional solution for the vehicle transmission mechanism, the axis of the transmission planetary gear is perpendicular to the axis of the transmission sun gear.

[0018] As an optional solution of the vehicle transmission mechanism, the vehicle transmission mechanism further includes a differential, and the differential includes two output shafts, and the two output shafts are respectively connected to the transmission sun gears of the two planetary gear trains in a one-to-one correspondence.

[0019] As an optional solution of the vehicle transmission mechanism, the differential also includes:

[0020] A housing, the housing being connectable to a power mechanism of the vehicle via a transmission shaft;

[0021] Two active planetary gears, the two active planetary gears are rotatably disposed in the housing and are arranged opposite to each other;

[0022] Two driven gears, the two driven gears are rotatably disposed in the housing and are coaxially arranged, the axis of the driven gear coincides with the axis of the transmission shaft, the two driven gears are respectively located on both sides of the driving planetary gears, and the two driven gears are meshed with the two driving planetary gears, and the two driven gears are respectively connected to the two output shafts to drive the corresponding transmission sun gear to rotate.

[0023] As an optional solution of the vehicle transmission mechanism, the vehicle transmission mechanism further includes:

[0024] A first transmission gear and a second transmission gear, the first transmission gear and the second transmission gear are meshed with each other, and an axis of the first transmission gear coincides with an axis of the transmission shaft;

[0025] Of the two driven gears, the driven gear far away from the first transmission gear is connected to one of the output shafts, and one of the output shafts passes through the driven gear close to the first transmission gear and is connected to one of the transmission sun gears; the driven gear close to the first transmission gear is connected to the first transmission gear, and the second transmission gear is connected to the other transmission sun gear through the other output shaft.

[0026] As an optional solution for the vehicle transmission mechanism, both the first transmission gear and the second transmission gear are helical gears.

[0027] As an optional solution for the vehicle transmission mechanism, the axis of the transmission sun gear coincides with the corresponding axis of the pivot shaft of the suspension and the frame.

[0028] On the other hand, a vehicle is provided, comprising at least one vehicle transmission mechanism as described in any one of the above items and wheels corresponding to the vehicle transmission mechanism and arranged in pairs, each of the vehicle transmission mechanisms being used to drive a pair of the wheels to rotate, a suspension being provided between all the wheels and a frame, one end of the suspension being pivotally connected to the frame, and the other end being connected to the corresponding wheel.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] The vehicle transmission mechanism and the vehicle of the present invention are characterized in that the suspension is pivotally connected to the frame, and the transmission planetary gear for driving the wheels to rotate is rotatably arranged on the suspension, so that the transmission sun gear can drive the transmission planetary gear to rotate around its axis and can also drive the transmission planetary gear to revolve around the transmission sun gear, so as to drive the corresponding suspension to swing around the pivot axis between it and the frame, so as to achieve the purpose of adjusting the suspension height according to the vehicle driving force and braking force, so as to realize the coupling of the vehicle driving force and braking force with the suspension height, the structure is simple and the cost is low, and the phenomenon of the vehicle raising its head and nodding its head caused by vehicle acceleration and braking is actively alleviated, thereby improving the riding comfort; the phenomenon of axle load transfer when the vehicle is accelerating and decelerating is reduced, thereby increasing the handling stability of the vehicle; and the vehicle body height can be actively lowered when the vehicle is traveling at high speed, thereby reducing air resistance and improving fuel economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the structure of a vehicle transmission mechanism in a front-wheel drive vehicle in an embodiment of the present invention;

[0032] Figure 2 is a schematic structural diagram of a vehicle transmission mechanism in a rear-wheel drive vehicle in an embodiment of the present invention;

[0033] Figure 3 A structural diagram of a vehicle transmission mechanism in an embodiment of the present invention;

[0034] Figure 4 A schematic diagram of the connection relationship of a vehicle transmission mechanism in an embodiment of the present invention;

[0035] Figure 5 This is a motion trend diagram of the front suspension affected by the planetary gear train when the vehicle brakes and recovers energy in an embodiment of the present invention;

[0036] Figure 6 Schematic diagram of the direction of action of the planetary gear revolution torque under braking conditions in an embodiment of the present invention;

[0037] Figure 7 is the equivalent effect F′ in the embodiment of the present invention f Schematic diagram of the working position;

[0038] Figure 8 Schematic diagram of the movement trend of the front suspension affected by the planetary gear train when the vehicle accelerates in an embodiment of the present invention.

[0039] Reference numerals:

[0040] 1. Driving wheel;

[0041] 2. Suspension;

[0042] 3. Planetary gear train; 31. Transmission planetary gear; 32. Transmission sun gear;

[0043] 4. differential; 41. output shaft; 42. housing; 43. driving planetary gear; 441. first driven gear; 442. second driven gear;

[0044] 5. Transmission shaft;

[0045] 61. First transmission gear; 62. Second transmission gear. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, 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.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0049] In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or are the positions or positional relationships in which the inventive product is usually placed when in use. They 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 operated 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 to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0050] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0052] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0053] like Figure 1-8 As shown, this embodiment provides a vehicle transmission mechanism and a vehicle, the vehicle includes at least one vehicle transmission mechanism and wheels corresponding to the vehicle transmission mechanism and arranged in pairs, each vehicle transmission mechanism is used to drive a pair of the above wheels to rotate, the above wheels are usually called driving wheels 1, and the vehicle also includes driven wheels. In this embodiment, a suspension 2 is provided between all driving wheels 1 and the frame, one end of the suspension 2 is pivotally connected to the frame, and the other end is connected to the corresponding driving wheel 1, and the end of the suspension 2 connected to the driving wheel 1 is connected to the vehicle body through a spring and a shock absorber. Most existing passenger cars are front-wheel drive, and this embodiment introduces the vehicle transmission mechanism by taking a front-wheel drive vehicle as an example. Of course, the vehicle transmission mechanism is also applicable to rear-wheel drive vehicles, four-wheel drive vehicles and multi-axle drive vehicles.

[0054] In the prior art, in a front-wheel drive vehicle, the driving wheel 1 is located at the end of the vehicle close to the front of the vehicle, and the vehicle has the phenomenon of head-up when accelerating and head-nodding when braking. In a rear-wheel drive vehicle, the driving wheel 1 is located at the end of the vehicle far from the front of the vehicle, and the vehicle will have the opposite phenomenon of the front-wheel drive vehicle when accelerating and braking, that is, head-nodding when accelerating and head-up when braking.

[0055] In order to solve the above problems, the vehicle transmission mechanism of this embodiment includes a planetary gear train 3 corresponding to the driving wheel 1, and the planetary gear train 3 includes a transmission planetary gear 31 and a transmission sun gear 32. The transmission planetary gear 31 is used to drive the corresponding wheel to rotate. The transmission planetary gear 31 is rotatably arranged on the corresponding suspension 2 through a rotating connection member such as a bearing; illustratively, an extension shaft is connected to the rear of the transmission planetary gear 31, and the extension shaft drives the universal joint and the corresponding wheel transmission shaft 5 to drive the corresponding driving wheel 1 to rotate. The transmission sun gear 32 is rotatably arranged on the frame, and the transmission sun gear 32 is meshed with the transmission planetary gear 31. The transmission sun gear 32 can drive the transmission planetary gear 31 to rotate around its axis to drive the corresponding wheel to rotate. The transmission sun gear 32 can also drive the transmission planetary gear 31 to revolve around the transmission sun gear 32 to drive the corresponding suspension 2 to swing around its pivot axis with the frame.

[0056] It should be noted that the position of the suspension 2 is affected by the spring force, the damping force of the shock absorber and the revolution torque of the transmission planetary gear 31 at the same time. In other words, the freedom of the transmission planetary gear 31 to revolve around the corresponding transmission sun gear 32 is affected by the spring force of the suspension 2 and the damping force of the shock absorber. Once the revolution torque changes, the corresponding transmission planetary gear 31 can be driven to revolve around the transmission sun gear 32 through the transmission sun gear 32, thereby driving the corresponding suspension 2 to swing around its pivot axis with the frame, so that the vehicle body posture changes with the vehicle output state, thereby improving the ride comfort and economy.

[0057] In this embodiment, Figure 1 As shown, in a front-wheel drive vehicle, when the driving torque of the active wheel 1 increases, the vehicle is in an acceleration or high-speed or steep-slope driving state, the transmission sun gear 32 can drive the corresponding transmission planetary gear 31 to revolve around the transmission sun gear 32, so as to drive the corresponding suspension 2 to swing upward around the pivot axis between it and the frame, so that the height of the front of the vehicle is reduced, thereby suppressing the vehicle's acceleration head-up phenomenon and improving the ride comfort; lowering the height of the front of the vehicle when the vehicle is driving at high speed is conducive to reducing the vehicle's frontal area, reducing air resistance, and improving economy; when the vehicle is on a steep slope, the height of the front of the vehicle is lowered to improve the body posture and improve the ride comfort. At the same time, when a fuel vehicle brakes through the engine or an electric vehicle or a hybrid vehicle recovers braking energy, the transmission sun gear 32 can drive the corresponding transmission planetary gear 31 to revolve around the transmission sun gear 32, so as to drive the corresponding suspension 2 to swing downward around the pivot axis between it and the frame, so that the height of the front of the vehicle is increased, thereby suppressing the vehicle's braking head-up phenomenon, and when the vehicle goes down a steep slope, the height of the front of the vehicle is increased to improve the body posture and improve the ride comfort.

[0058] like Figure 2As shown, in a rear-wheel drive vehicle, when the driving torque of the active wheel 1 increases, the vehicle is in an accelerating or high-speed or steep-slope driving state, and the transmission sun gear 32 can drive the corresponding transmission planetary gear 31 to revolve around the transmission sun gear 32, so as to drive the corresponding suspension 2 to swing downward around its pivot axis with the frame, so that the height of the rear end of the vehicle is increased, which is equivalent to lowering the height of the front end of the vehicle, thereby suppressing the vehicle's head-up phenomenon when accelerating and improving riding comfort; raising the height of the rear end of the vehicle when the vehicle is driving at high speed is beneficial to reducing the vehicle's frontal area, reducing air resistance and improving economy; when the vehicle goes down a steep slope, the height difference between the front and rear ends of the vehicle is reduced to improve the body posture and improve riding comfort. When a fuel vehicle brakes through its engine or an electric vehicle or a hybrid vehicle recovers braking energy, the transmission sun gear 32 can drive the corresponding transmission planetary gear 31 to revolve around the transmission sun gear 32, so as to drive the corresponding suspension 2 to swing upward around its pivot axis with the frame, so that the height of the rear of the vehicle is reduced, which is equivalent to raising the height of the front of the vehicle, thereby suppressing the vehicle's braking nodding phenomenon, and can reduce the height difference between the front and rear of the vehicle when the vehicle goes down a steep slope to improve the body posture and enhance ride comfort.

[0059] In the vehicle transmission mechanism of this embodiment, the suspension 2 is pivotally connected to the frame, and the transmission planetary gear 31 that drives the active wheel 1 to rotate is rotatably arranged on the suspension 2, so that the transmission sun gear 32 can drive the transmission planetary gear 31 to rotate around its axis, and can also drive the transmission planetary gear 31 to revolve around the transmission sun gear 32, so as to drive the corresponding suspension 2 to swing around the pivot axis between it and the frame, so as to achieve the purpose of adjusting the height of the suspension 2 according to the vehicle driving force and braking force, so as to realize the coupling of the vehicle driving force and braking force with the suspension 2. The structure is simple and the cost is low. The phenomenon of the vehicle raising its head and nodding its head caused by vehicle acceleration and braking is actively alleviated, thereby improving the riding comfort; the phenomenon of axle load transfer when the vehicle is accelerating and decelerating is reduced, thereby increasing the handling stability of the vehicle; and the vehicle body height can be actively lowered when the vehicle is traveling at high speed, thereby reducing air resistance and improving fuel economy.

[0060] Optionally, the axis of the transmission planetary gear 31 is perpendicular to the driving direction of the vehicle. Optionally, the axis of the transmission planetary gear 31 is perpendicular to the axis of the transmission sun gear 32. This arrangement makes the axis of the transmission sun gear 32 parallel to the driving direction of the vehicle, which is conducive to reducing the space occupied by the vehicle transmission mechanism and facilitating the layout of the entire vehicle.

[0061] Optionally, the vehicle transmission mechanism further includes a differential 4, which includes two output shafts 41, and the two output shafts 41 are respectively connected to the transmission sun gears 32 of the two planetary gear trains 3 in a one-to-one correspondence. Optionally, the differential 4 also includes a housing 42, two driving planetary gears 43 and two driven gears, and the housing 42 is pivotally connected to the frame, and the housing 42 can be connected to the power mechanism of the vehicle through the transmission shaft 5. The two driving planetary gears 43 are exactly the same, and the two driving planetary gears 43 can be rotatably arranged in the housing 42 and arranged oppositely; the two driven gears are respectively rotatably arranged in the housing 42 and coaxially arranged, and the axis of the driven gear coincides with the axis of the transmission shaft 5. The two driven gears are respectively located on both sides of the driving planetary gears 43, and the two driven gears are meshed with the two driving planetary gears 43. The two driven gears are respectively connected to the two output shafts 41 to drive the corresponding transmission sun gears 32 to rotate. In this embodiment, the housing 42 is connected to the output shaft 41 of the transfer case through the transmission shaft 5 as a power input. The housing 42 is driven to rotate by the output shaft 41 of the transfer case, and then drives the two driving planetary gears 43 to revolve around the axis of the transmission shaft 5. The two driving planetary gears 43 jointly drive two coaxial driven gears to rotate. The differential 4 of this embodiment has the advantages of simple structure and small space occupation.

[0062] Optionally, the vehicle transmission mechanism further includes a first transmission gear 61 and a second transmission gear 62 , the first transmission gear 61 and the second transmission gear 62 are meshed with each other, and the axis of the first transmission gear 61 coincides with the axis of the transmission shaft 5 .

[0063] For the convenience of description, the driven gear far from the first transmission gear 61 is recorded as the first driven gear 441, and the driven gear close to the first transmission gear 61 is recorded as the second driven gear 442. A through hole is provided at the center of the second driven gear 442. Of the two driven gears, the first driven gear 441 is connected to one of the output shafts 41, and the output shaft 41 passes through the through hole of the second driven gear 442 and is connected to one of the transmission sun gears 32, so that the first driven gear 441 drives the transmission sun gear 32 connected thereto to rotate through one of the output shafts 41.

[0064] The second driven gear 442 is connected to the first transmission gear 61, and the second transmission gear 62 is connected to another transmission sun gear 32 through another output shaft 41, and then the first transmission gear 61 is driven to rotate through the second driven gear 442, and the first transmission gear 61 drives the second transmission gear 62 to rotate, and the second transmission gear 62 drives the transmission sun gear 32 connected thereto to rotate through another output shaft 41. The first transmission gear 61 and the second transmission gear 62 have the same number of teeth, which plays a role in changing the transmission direction and optimizing the layout position.

[0065] Optionally, both the first transmission gear 61 and the second transmission gear 62 are helical gears, which have strong load-bearing capacity, stable transmission, and advantages of low impact, vibration and noise.

[0066] In this embodiment, the axis of the transmission sun gear 32 coincides with the axis of the corresponding pivot axis of the suspension 2 and the frame, which is beneficial to reducing the space occupied by the vehicle transmission mechanism. In other embodiments, guides, universal joints and other mechanisms can be added to pivot the suspension 2 separately to other positions of the frame.

[0067] By way of example, the actual effect of the vehicle transmission mechanism of this embodiment is calculated in combination with specific working conditions. Taking a front-wheel drive vehicle as an example, the suspension 2 is specifically a front suspension.

[0068] Braking conditions

[0069] When the vehicle brakes, it can be divided into two stages. The first stage is when the braking intensity is small, the front wheel, i.e. the active wheel 1, performs energy recovery braking through the power mechanism, and all braking force is provided by the power mechanism; the second stage is when the braking intensity is large, considering the handling stability factor, the front and rear axles need to brake together, and the braking force required by the vehicle is provided by the power mechanism and the friction brake. Figure 5 The figure is a motion trend diagram of the front suspension affected by the planetary gear train when the vehicle brakes and regenerates energy in this embodiment. The solid line represents the position of the front suspension before braking, and the dotted line represents the position of the front suspension when the vehicle brakes and regenerates energy. Figure 5 As shown, the braking force provided by energy recovery by the power mechanism can cause the front suspension to swing downward around the pivot axis between the front suspension and the frame through the vehicle transmission mechanism in this embodiment, thereby raising the height of the front of the vehicle and suppressing the braking nodding phenomenon.

[0070] When the vehicle brakes, the vertical pressure on the front and rear axles from the ground changes, but the sum of the vertical pressure on the front and rear axles from the ground remains unchanged:

[0071] F f +F r = mg;

[0072] Among them: F f F is the vertical pressure on the front axle from the ground; r is the vertical pressure on the rear axle from the ground; m is the mass of the vehicle; g is the acceleration due to gravity.

[0073] Since the center of mass of the vehicle is higher than the braking plane, the vehicle will tend to tilt forward due to inertia when braking. The inertial force will apply a forward tilt torque to the vehicle chassis. The forward tilt torque of the vehicle is:

[0074] M f =h·m·z;

[0075] Where: M f is the vehicle forward tilt torque generated by inertia force; h is the distance between the center of mass of the vehicle and the ground in the vertical direction; z is the vehicle braking deceleration.

[0076] Forward torque M f The load on the front axle will increase and the load on the rear axle will decrease, that is, F f Increase, F r decreases, and the relationship is:

[0077] F f ·aF r b=M f =h·m·z;

[0078] Where: a is the horizontal distance between the front axle axis and the vehicle's center of mass; b is the horizontal distance between the rear axle axis and the vehicle's center of mass.

[0079] Forward torque M f It will also change the position of the front and rear suspensions, allowing the passengers to feel the angular acceleration, which reduces ride comfort. In the following calculations, to simplify the steps, the front suspension and the vehicle body are considered to be rigidly connected, with no relative displacement change, and the angular acceleration of the front vehicle body in the pitch direction is represented by the forward and backward torques of the vehicle body. During acceleration or braking, the smaller the angular acceleration of the vehicle body in the pitch direction, the higher the ride comfort.

[0080] 1) Braking intensity is low

[0081] When the braking intensity is small, the front wheel, i.e., the active wheel 1, is braked by energy recovery through the power mechanism, and all the braking force is provided by the power mechanism, the braking force required by the vehicle is F. b :

[0082] F b = z·m;

[0083] Since the braking force is directly provided by the transmission planetary gear 31 of the vehicle transmission mechanism without speed change, the braking torque of the tire is equal to the rotation torque of the transmission planetary gear 31, that is:

[0084] M tb =M rot = z·m·r w ;

[0085] Where: M tb is the braking torque of the tire; M rot is the rotation torque of the transmission planetary gear 31; r w is the contact radius of the tire.

[0086] Then the revolution torque M of the transmission planetary gear 31 is rev for:

[0087]

[0088] Where: M rev I is the revolution torque of the transmission planetary gear 31; p It is the transmission ratio of planetary gear train 3.

[0089] like Figure 6 As shown, the revolution of the transmission planetary gear 31 will cause the relative distance between the front suspension and the vehicle body to tend to increase, and the effect of the revolution torque on the front suspension can be equivalent to the tire receiving an upward force F′ from the ground at the contact point. f , so that its value is:

[0090]

[0091] Where: F′ f is the equivalent force of the revolution torque of the transmission planetary gear 31 at the tire contact point; L s It is the distance between the axis of the pivot axis of the front suspension and frame and the center point of the tire contact.

[0092] like Figure 7 As shown in the figure, since we have stiffened the front suspension, that is, we do not consider the spring force and the deformation of the front suspension, F′ f It can be regarded as a force acting on the front axle and in an upward direction, which will produce a backward tilt torque M on the vehicle body. r , whose value is:

[0093]

[0094] Where: M r It is the backward tilt torque on the vehicle body caused by the vehicle's powertrain performing braking energy recovery.

[0095] The forward tilt torque M generated by the vehicle inertia during braking f and the backward tilt torque M generated by the braking energy recovery r The new forward torque is partially offset:

[0096]

[0097] It can be seen from this that the forward tilt torque will be reduced during braking, that is, the deformation of the front and rear suspensions will be reduced during braking, which can better suppress the braking nodding situation, and the angular acceleration that the occupants can feel will become smaller, which can improve the riding comfort; the axle load transfer caused by the change in the relative position of the vehicle body and the front suspension will be reduced, which can improve the handling stability.

[0098] When the vehicle transmission mechanism of this embodiment is used and the braking intensity is relatively low, the forward tilt torque generated by the inertia force of the vehicle body and the angular acceleration of the vehicle body in the pitch direction can be reduced by P%:

[0099]

[0100] 2) Conditions with high braking intensity

[0101] When the braking intensity is high, the front and rear axles need to be braked together, so part of the vehicle's kinetic energy will be converted into heat energy through the friction brake. However, the braking force generated by the friction brake cannot be converted to suppress the brake nodding phenomenon. Therefore, if this working condition is to be analyzed, the ratio of the regenerative braking force to the total braking force η needs to be introduced b , the comprehensive forward torque of the vehicle is:

[0102]

[0103] Under this condition, the braking nodding suppression effect is weakened, and the forward tilt torque and the angular acceleration of the vehicle body in the pitch direction during braking will be reduced by P%:

[0104]

[0105] Acceleration

[0106] When the vehicle accelerates, all driving force is output by the front wheels. Since the center of mass is higher than the driving force plane, the inertia force will exert a backward moment M on the vehicle body. r :

[0107] M r =h·m·a v ;

[0108] Among them: a v is the vehicle acceleration; h is the vertical distance between the center of mass of the vehicle and the ground; m is the total vehicle mass.

[0109] The torque required by the tire during acceleration is M t Since there are only half shafts and universal joints in the power transmission process from the transmission planetary gear 31 to the tire, there is no speed change process. If friction is ignored, M t Should be equal to the rotation torque M of the transmission planetary gear 31 rot :

[0110] M t =M rot =a v ·m·r w ;

[0111] Where: M t is the driving torque of the tire; M rot is the rotation torque of the transmission planetary gear 31; rw is the contact radius of the tire.

[0112] Then the revolution torque M of the transmission planetary gear 31 is rev for:

[0113]

[0114] Where: M rev I is the revolution torque of the transmission planetary gear 31; p It is the transmission ratio of planetary gear train 3.

[0115] The revolution of the planetary gear 31 will cause the relative distance between the front suspension and the vehicle body to decrease. The effect of the revolution torque on the front suspension can be equivalent to a downward force F′ from the ground on the tire at the contact point. f , so that its value is:

[0116]

[0117] Where: F′ f is the equivalent force of the revolution torque of the transmission planetary gear 31 at the tire contact point; L s It is the distance between the axis of the pivot axis of the front suspension and frame and the center point of the tire contact.

[0118] Since we have stiffened the front suspension, that is, we do not consider the spring force and the deformation of the front suspension, F′ f It can be regarded as a force acting on the front axle and in a downward direction, which will produce a forward torque M on the vehicle body. r , whose value is:

[0119]

[0120] Where: M r It is the forward tilt torque caused by the output torque of the vehicle's power system on the vehicle body.

[0121] The backward tilt torque M generated by the vehicle inertia force during acceleration f and the forward tilt torque M generated by the power mechanism output r The new backward tilt torque is partially offset:

[0122]

[0123] Figure 8 Schematic diagram of the movement trend of the front suspension affected by the planetary gear train when the vehicle accelerates in this embodiment. The solid line represents the position of the front suspension before acceleration; the dotted line represents the position of the front suspension during acceleration. Figure 8As shown, it can be seen that the rearward tilt torque will be reduced during acceleration, that is, the deformation of the front and rear suspensions will be reduced during acceleration, which can better suppress the acceleration head lift, and the angular acceleration that the occupants can feel becomes smaller, which can improve the riding comfort; the axle load transfer caused by the change in the relative position of the vehicle body and the front suspension becomes smaller, which can improve the handling stability.

[0124] By using the vehicle transmission mechanism of this embodiment, during acceleration, the backward tilt torque generated by the inertia force of the vehicle body and the angular acceleration of the vehicle body in the pitch direction can be reduced by P%:

[0125]

[0126] High-speed driving conditions

[0127] When the vehicle is traveling at high speed, the power output of the power mechanism is relatively large, and the driving resistance is mainly air resistance. The formula for automobile air resistance is:

[0128]

[0129] Among them: F w C is the air resistance encountered by the vehicle when it is moving; D is the vehicle's air resistance coefficient; A is the vehicle's frontal area; u is the vehicle's speed.

[0130] From the above formula, it can be seen that reducing the frontal area of ​​the vehicle can reduce the air resistance of the vehicle, thereby improving the economy. t When the vehicle is driven, the torque of the planetary gear 31 rotating on its own should be:

[0131] M rot =M t =F t ·r w ;

[0132] Where: M t is the driving torque of the tire; M rot is the rotation torque of the transmission planetary gear 31; r w is the contact radius of the tire.

[0133] The torque of the planetary gear 31 revolution should be:

[0134]

[0135] Where: M rev I is the revolution torque of the transmission planetary gear 31; p It is the transmission ratio of planetary gear train 3.

[0136] From the above formula, it can be seen that the vehicle power mechanism outputs torque to drive the vehicle forward, and also provides torque for the transmission planetary gear 31 to revolve. The transmission planetary gear 31 transmits its revolving torque to the front suspension, causing the front suspension spring to be compressed and the height of the vehicle head to drop. The length of the front suspension spring compressed by the output torque of the power mechanism is L p :

[0137]

[0138] Where: L p L is the length of the front suspension spring compressed due to the output torque of the power mechanism; spr k is the distance between the point where the spring acts on the front suspension and the axis of rotation of the front suspension; f is the front suspension stiffness.

[0139] In summary, the vehicle transmission mechanism of this embodiment can enable the torque output by the power mechanism to drive the vehicle when the vehicle is traveling at high speed, and can also apply torque to the front suspension, so that the front suspension swings upward around the pivot axis between it and the frame, the height of the front of the vehicle drops, the frontal area of ​​the vehicle is reduced, and the economy is improved.

[0140] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A vehicle transmission mechanism, used for driving a pair of wheels of a vehicle to rotate, wherein a suspension (2) is provided between the two wheels and a vehicle frame, one end of the suspension (2) is pivotally connected to the vehicle frame, and the other end is connected to the corresponding wheel; It is characterized in that The vehicle transmission mechanism comprises a planetary gear train (3) arranged in one-to-one correspondence with the wheels, and the planetary gear train (3) comprises: A transmission planetary gear (31), used for driving the corresponding wheel to rotate, the transmission planetary gear (31) being rotatably disposed on the corresponding suspension (2); The transmission sun gear (32) is rotatably arranged on the frame. The transmission sun gear (32) is meshed with the transmission planetary gear (31). The transmission sun gear (32) can drive the transmission planetary gear (31) to rotate around its axis to drive the corresponding wheel to rotate. The transmission sun gear (32) can also drive the transmission planetary gear (31) to revolve around the transmission sun gear (32) to drive the corresponding suspension (2) to swing around the pivot axis between it and the frame.

2. The vehicle transmission mechanism according to claim 1, characterized in that: The wheel is located at one end of the vehicle close to the front of the vehicle; When the driving torque of the wheel increases, the transmission sun gear (32) can drive the corresponding transmission planetary gear (31) to revolve around the transmission sun gear (32), so as to drive the corresponding suspension (2) to swing upward around the pivot axis between the suspension and the frame; When a fuel vehicle brakes through its engine or an electric vehicle or a hybrid vehicle recovers braking energy, the transmission sun gear (32) can drive the corresponding transmission planetary gear (31) to revolve around the transmission sun gear (32), thereby driving the corresponding suspension (2) to swing downward around its pivot axis with the frame.

3. The vehicle transmission mechanism according to claim 1, characterized in that: The wheel is located at an end of the vehicle away from the front of the vehicle; When the driving torque of the wheel increases, the transmission sun gear (32) can drive the corresponding transmission planetary gear (31) to revolve around the transmission sun gear (32), so as to drive the corresponding suspension (2) to swing downward around the pivot axis between the suspension and the vehicle frame; When a fuel vehicle brakes through its engine or an electric vehicle or a hybrid vehicle recovers braking energy, the transmission sun gear (32) can drive the corresponding transmission planetary gear (31) to revolve around the transmission sun gear (32), thereby driving the corresponding suspension (2) to swing upward around its pivot axis with the frame.

4. The vehicle transmission mechanism according to claim 1, characterized in that: The axis of the transmission planetary gear (31) is perpendicular to the driving direction of the vehicle.

5. The vehicle transmission mechanism according to claim 4, characterized in that: The axis of the transmission planetary gear (31) is perpendicular to the axis of the transmission sun gear (32).

6. The vehicle transmission mechanism according to claim 5, characterized in that: The vehicle transmission mechanism also includes a differential (4), and the differential (4) includes two output shafts (41). The two output shafts (41) are respectively connected to the transmission sun gears (32) of the two planetary gear trains (3) in a one-to-one correspondence.

7. The vehicle transmission mechanism according to claim 6, characterized in that: The differential (4) further comprises: A housing (42), wherein the housing (42) can be connected to a power mechanism of the vehicle via a transmission shaft (5); Two active planetary gears (43), the two active planetary gears (43) being rotatably disposed in the housing (42) and arranged opposite to each other; Two driven gears, the two driven gears are rotatably disposed in the housing (42) and are coaxially arranged, the axes of the driven gears coincide with the axis of the transmission shaft (5), the two driven gears are respectively located on both sides of the driving planetary gear (43), and the two driven gears are meshed with the two driving planetary gears (43), and the two driven gears are respectively connected to the two output shafts (41) to drive the corresponding transmission sun gear (32) to rotate.

8. The vehicle transmission mechanism according to claim 7, characterized in that: The vehicle transmission mechanism also includes: A first transmission gear (61) and a second transmission gear (62), wherein the first transmission gear (61) and the second transmission gear (62) are meshed with each other, and an axis of the first transmission gear (61) coincides with an axis of the transmission shaft (5); Of the two driven gears, the driven gear far away from the first transmission gear (61) is connected to one of the output shafts (41), and the output shaft (41) passes through the driven gear close to the first transmission gear (61) and is connected to one of the transmission sun gears (32); the driven gear close to the first transmission gear (61) is connected to the first transmission gear (61), and the second transmission gear (62) is connected to the other transmission sun gear (32) through the other output shaft (41).

9. The vehicle transmission mechanism according to claim 8, characterized in that: The first transmission gear (61) and the second transmission gear (62) are both helical gears.

10. The vehicle transmission mechanism according to claim 1, characterized in that: The axis of the transmission sun gear (32) coincides with the corresponding axis of the pivot axis of the suspension (2) and the frame.

11. A vehicle, characterized in that: It comprises at least one vehicle transmission mechanism as described in any one of claims 1 to 10 and wheels corresponding to the vehicle transmission mechanism and arranged in pairs, each of the vehicle transmission mechanisms is used to drive a pair of the wheels to rotate, a suspension (2) is provided between all the wheels and the frame, one end of the suspension (2) is pivotally connected to the frame, and the other end is connected to the corresponding wheel.

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