Power transmission and planetary differential steering device of all-terrain vehicle

Abstract

The invention discloses a power transmission and planetary differential steering device of an all-terrain vehicle, which comprises an engine assembly, a planetary differential steering device and a power transmission device, and the engine assembly comprises an engine box body and an engine crankshaft assembly; the gearbox assembly comprises a gearbox body, a gearbox power input shaft assembly, a gearbox auxiliary shaft assembly, a transition shaft assembly, a power dividing shaft assembly, a rear-drive planetary differential mechanism and a front output shaft assembly. The rear-drive differential lock switching unit is used for controlling the locking state of the rear-drive differential lock; the two-wheel drive / four-wheel drive switching unit is used for controlling the all-terrain vehicle to be switched between a two-wheel drive mode and a four-wheel drive mode; and the front-drive differential lock switching unit is used for controlling the locking state of the front-drive differential lock. According to the device, six driving mode control schemes can be achieved through combined logic control of the planetary differential steering mechanism and the front and rear driving differential locking system, and the complex road surface adaptive capacity and the cross-country performance of the all-terrain vehicle are effectively improved.

Description

Technical Field

[0001] The invention relates to an all-terrain vehicle, more specifically, to a power transmission and planetary differential steering device of the all-terrain vehicle. Background Art

[0002] All-terrain vehicles can travel freely in harsh terrain conditions such as mountains, beaches, forest roads, wetlands, and farms. They can adapt to complex and changing environments, have good off-road performance, and are widely used in a wide range of scenarios, making them popular among people. For different usage scenarios and road conditions, all-terrain vehicles need to be able to flexibly switch to different driving modes to adapt to complex road conditions, effectively improve the adaptability, passability, safe turning on hard shoulder roads, and smooth reliability of driving on complex roads, while reducing the driver's operating intensity. As a non-road power vehicle, all-terrain vehicles have complex driving conditions and need to have high passability and high maneuverability. However, the overall performance of current products in the industry needs to be further improved in terms of driving stability, maneuverability, passability on complex terrain, and obstacle crossing ability to meet the market's demand for higher safety, reliability, and handling stability of products. Summary of the invention

[0003] Based on this, it is necessary to provide a power transmission and planetary differential steering device for an all-terrain vehicle in response to the above technical problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A power transmission and planetary differential steering device for an all-terrain vehicle, characterized in that the power transmission and planetary differential steering device for an all-terrain vehicle comprises:

[0006] An engine assembly, wherein the engine assembly comprises an engine case and an engine crankshaft assembly;

[0007] The gearbox assembly comprises a gearbox housing and a gearbox power input shaft assembly, a gearbox countershaft assembly, a transition shaft assembly, a power splitter shaft assembly, a rear-drive planetary differential and a front output shaft assembly;

[0008] A rear-drive differential lock switching unit, wherein the rear-drive differential lock switching unit is used to control the locking state of the rear-drive differential lock;

[0009] A two-wheel drive / four-wheel drive switching unit, the two-wheel drive / four-wheel drive switching unit is used to control the all-terrain vehicle to switch between a two-wheel drive mode and a four-wheel drive mode;

[0010] The front-drive differential lock switching unit is used to control the locking state of the front-drive differential lock.

[0011] As a preferred embodiment of the present invention, the rear-drive differential lock switching unit includes a rear-drive differential lock switching switch, a rear-drive differential lock motor controller and a rear-drive differential lock motor assembly, the two-wheel drive / four-wheel drive switching unit includes a two-wheel drive / four-wheel drive switching switch, a two-wheel drive / four-wheel drive switching controller and a two-wheel drive / four-wheel drive switching motor, and the front-drive differential lock switching unit includes a front-drive differential lock switching switch, a front-drive differential motor controller and a front-drive differential lock motor.

[0012] As a preferred embodiment of the present invention, the rear-wheel drive differential lock switch is button C, the two-wheel drive / four-wheel drive switch is button B, and the front-wheel drive differential lock switch is button A. The button C, button B and button A are arranged in a triangle. A rotatable two-wheel drive and four-wheel drive limit indicator knob is provided around the button C. The two-wheel drive and four-wheel drive limit indicator knob limits the pressing or popping up of the button B or button A.

[0013] As a preferred embodiment of the present invention, the engine crankshaft assembly is provided with a CVT driving wheel assembly.

[0014] The transmission power input shaft assembly is arranged in parallel with the engine crankshaft assembly. The transmission power input shaft assembly is provided with a CVT driven wheel assembly, a high-speed driving gear, a reverse gear driving gear, a low-speed driving gear and a reverse chain. The CVT driven wheel assembly cooperates with the CVT driving wheel assembly through a transmission belt.

[0015] The gearbox countershaft assembly is arranged in parallel with the gearbox power input shaft assembly, and the gearbox countershaft assembly is provided with a parking gear, a countershaft driven gear, a high-speed driven gear, a reverse gear driven gear, a low-speed driven gear, a first shift fork shift switching plate and a second shift fork shift switching plate.

[0016] The transition shaft assembly is arranged in parallel with the gearbox countershaft assembly, and the transition shaft assembly is provided with a transition shaft output gear and a transition shaft input gear.

[0017] The power split shaft assembly is arranged in parallel with the transition shaft assembly, and the power split shaft assembly is provided with a power split shaft input gear, a power split shaft rear drive gear and a power split shaft front drive bevel gear.

[0018] The rear-drive planetary differential comprises a rear-drive driven gear, a rear-drive planetary carrier assembly, a rear-drive planetary wheel shaft, a rear-drive left planetary wheel assembly, a rear-drive right planetary wheel assembly, a rear-drive differential switching plate, a rear-drive left half-shaft assembly, a rear-drive right half-shaft assembly and a planetary differential fastening bolt. The rear-drive left half-shaft assembly and the rear-drive right half-shaft assembly are arranged in parallel with the power split shaft assembly.

[0019] The front output shaft assembly is arranged vertically with the power split shaft assembly, and the front output shaft assembly is provided with a front output shaft driven bevel gear and a front output shaft spline.

[0020] As a preferred embodiment of the present invention,

[0021] The parking gear, the countershaft driven gear, the first fork shift switching plate and the second fork shift switching plate are connected to the gearbox countershaft assembly through a spline to form an integral whole, and the first fork shift switching plate and the second fork shift switching plate can slide axially relative to the gearbox countershaft assembly, the high-speed driven gear, the reverse gear driven gear, and the low-speed driven gear are connected through bearings and can rotate freely relative to the gearbox countershaft assembly, the high-speed driven gear and the low-speed driven gear are respectively meshed with the high-speed driving gear and the low-speed driving gear through gears, and the reverse gear driven gear transmits power to the reverse gear driving gear through a reverse gear chain.

[0022] The transition shaft input gear meshes with the countershaft driven gear and transmits power to the transition shaft output gear.

[0023] The rear-drive planetary carrier assembly is provided with a rear-drive planetary carrier assembly synchronous locking hole, the rear-drive differential switching plate is provided with a rear-drive differential switching plate fork groove and a rear-drive differential switching plate synchronous locking boss, the rear-drive left half-shaft assembly is provided with a rear-drive left half-shaft gear, a rear-drive left half-shaft internal spline and a rear-drive left half-shaft synchronous locking hole, the rear-drive right half-shaft assembly is provided with a rear-drive right half-shaft gear and a rear-drive right half-shaft internal spline, the rear-drive driven gear is meshed with the power split shaft rear-drive driving gear through a gear, and the rear The rear drive planetary carrier assembly is fixedly connected with the rear drive driven gear through the planetary differential fastening bolts to form a whole, the rear drive left planetary gear combination and the rear drive right planetary gear combination are connected with the rear drive planetary carrier assembly rotating pair through the rear drive planetary gear rotating shaft, the rear drive left half-shaft gear on the rear drive left half-shaft assembly is meshed with the rear drive left planetary wheel combination gear, the rear drive right planetary wheel combination is meshed with the rear drive left planetary wheel combination gear, and the rear drive right half-shaft gear on the rear drive right half-shaft assembly is meshed with the rear drive right planetary wheel combination gear.

[0024] As a preferred embodiment of the present invention, the rear-drive planetary differential transmits the power of the engine assembly to the rear-drive left half-shaft assembly and the rear-drive right half-shaft assembly, the rear-drive left half-shaft assembly drives the rear left wheel, and the rear-drive right half-shaft assembly drives the rear right wheel, and the front output shaft assembly transmits the power of the engine assembly to the universal joint assembly and the front axle assembly, and the front axle assembly drives the front left drive shaft and the front right drive shaft, the front left drive shaft drives the front left wheel, and the front right drive shaft drives the front right wheel.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention provides a power transmission and planetary differential steering device for an all-terrain vehicle. Under the premise of satisfying a continuously variable speed change function, a gearbox gear switching function, a rear-drive differential lock switching function, a front-drive differential lock switching function, and a whole-vehicle power drive two-wheel drive or four-wheel drive switching function, the device can realize six drive mode control schemes through combined logic control of a planetary differential steering mechanism and a front and rear drive differential lock system: two-wheel drive rear-drive lock, two-wheel drive rear-drive differential, four-wheel drive rear lock front differential, four-wheel drive rear differential front differential, four-wheel drive rear lock front lock, and four-wheel drive rear differential front lock, thereby effectively improving the adaptability of the all-terrain vehicle to complex roads and the off-road performance, and having stable and reliable performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the scheme of the present invention, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 It is a schematic diagram of the structure of a power transmission assembly according to an embodiment of the present invention;

[0029] Figure 2 It is a schematic diagram of the structure of the rear drive differential lock switching system;

[0030] Figure 3 This is a three-dimensional diagram of the rear-drive planetary differential mechanism;

[0031] Figure 4 This is the left view of the rear-drive planetary differential mechanism;

[0032] Figure 5 This is a schematic diagram of the planar principle of the rear-drive planetary differential mechanism;

[0033] Figure 6 It is a schematic diagram of the structure of the vehicle power drive system;

[0034] Figure 7 It is a schematic diagram of the front drive differential lock and two-wheel drive and four-wheel drive switching system structure;

[0035] Figure 8 It is a schematic diagram of the vehicle drive category and the working status of the switch;

[0036] Fig. 9 This is a schematic diagram of the vehicle drive category instrument display and the power-on status of the drive motor; the markings in the figure are as follows:

[0037] 1-engine case;

[0038] 2-engine crankshaft assembly;

[0039] 3-CVT driving wheel combination;

[0040] 31 - driving wheel fixing part;

[0041] 32- driving wheel moving part;

[0042] 33-driving wheel roller assembly;

[0043] 34-driving wheel compression spring;

[0044] 35 - driving wheel limit block;

[0045] 4-driving wheel gasket;

[0046] 5- driving wheel bolt;

[0047] 6- transmission belt;

[0048] 7-CVT driven wheel combination;

[0049] 71 - driven wheel moving part;

[0050] 72 - driven wheel fixing part;

[0051] 73 - driven wheel compression spring;

[0052] 8 - driven wheel gasket;

[0053] 9-driven wheel bolt;

[0054] 10 - gearbox housing;

[0055] 11-transmission power input shaft assembly;

[0056] 111 - high speed driving gear;

[0057] 112 - reverse gear driving gear;

[0058] 113 - low speed driving gear;

[0059] 114 - reverse gear chain;

[0060] 12 - gearbox countershaft assembly;

[0061] 121 - parking gear;

[0062] 122 - countershaft driven gear;

[0063] 123 - high speed driven gear;

[0064] 124 - reverse driven gear;

[0065] 125 - low speed driven gear;

[0066] 126 - first fork shift switch plate;

[0067] 127 - second fork shift switch plate;

[0068] 13 - transition shaft assembly;

[0069] 131 - Transition shaft input gear;

[0070] 132 - transition shaft output gear;

[0071] 14-power splitter shaft assembly;

[0072] 141-power splitter shaft input gear;

[0073] 142-power splitter shaft rear drive gear;

[0074] 143-power split shaft front drive bevel gear;

[0075] 15-Rear drive planetary differential;

[0076] 151 - rear drive driven gear;

[0077] 152-rear drive planetary carrier assembly;

[0078] 1521-Synchronous locking hole of rear drive planetary carrier assembly;

[0079] 153-rear drive planetary gear shaft;

[0080] 154-rear drive left planetary gear assembly;

[0081] 155-Rear drive right planetary gear assembly;

[0082] 156-rear drive differential switching plate;

[0083] 1561-Rear drive differential shift plate fork slot;

[0084] 1562-rear drive differential switching plate synchronous locking boss;

[0085] 157-rear drive left half shaft assembly;

[0086] 1571-Rear drive left half shaft gear;

[0087] 1572-Inner spline of rear drive left half shaft;

[0088] 1573-Rear drive left half shaft synchronous locking hole;

[0089] 158 - rear drive right half shaft assembly;

[0090] 1581-Rear drive right half shaft gear;

[0091] 1582-Inner spline of rear drive right half shaft;

[0092] 159-Planetary differential fastening bolt;

[0093] 16-front output shaft assembly;

[0094] 161-front output shaft driven bevel gear;

[0095] 162 - front output shaft spline;

[0096] 201-voltage regulated power supply;

[0097] 202-Rear drive differential lock switch;

[0098] 203 - rear drive differential lock motor controller;

[0099] 204-rear drive differential lock motor assembly;

[0100] 2041-Rear drive differential lock motor push rod;

[0101] 205-Rear drive differential lock fork assembly;

[0102] 2051-Rear drive differential lock fork lock pin;

[0103] 2052-Rear drive differential lock fork push rod;

[0104] 2053-Rear drive differential lock fork;

[0105] 2054-Rear drive differential lock compression spring;

[0106] 2055-Rear drive differential lock compression spring limit seat;

[0107] 2056-Rear drive differential lock compression spring limit ring;

[0108] 100-engine assembly;

[0109] 200 - gearbox assembly;

[0110] 300 - gearbox connection seat;

[0111] 400-Universal joint assembly;

[0112] 410 – rear universal joint;

[0113] 420 – front universal joint;

[0114] 500 - front axle assembly;

[0115] 501 - front axle input connection plate;

[0116] 502 - 2WD / 4WD switch plate connection sleeve;

[0117] 503 - bearings;

[0118] 504-front axle box;

[0119] 505 - 2WD / 4WD switch plate;

[0120] 506 - front axle driving bevel gear shaft;

[0121] 507-front axle driven bevel gear;

[0122] 508 - front axle differential housing;

[0123] 5081-front axle differential switching plate connection seat;

[0124] 509 - front axle differential center shaft;

[0125] 510 - front axle planetary gear (front);

[0126] 511 - front axle differential gear (left);

[0127] 512 - front axle planetary gear (rear);

[0128] 513 - front axle differential gear (right);

[0129] 514 - 2WD / 4WD switch;

[0130] 515 - 2WD / 4WD switch controller;

[0131] 516 - 2WD / 4WD switching motor;

[0132] 517 - 2WD / 4WD switching fork;

[0133] 518 - Front drive differential lock switch;

[0134] 519-Front drive differential motor controller;

[0135] 520-Front drive differential lock motor;

[0136] 521-Front drive differential lock fork;

[0137] 522-Front drive differential lock switch plate;

[0138] 523-2nd and 4th wheel drive limit indicator button;

[0139] 610 - rear left drive shaft;

[0140] 620 – rear right drive shaft;

[0141] 710 – front left drive shaft;

[0142] 720 – front right drive shaft;

[0143] 810 – rear left wheel;

[0144] 820 – rear right wheel;

[0145] 910 – front left wheel;

[0146] 920 – front right wheel;

[0147] N gear – neutral gear;

[0148] H gear-high speed gear;

[0149] L gear – low gear;

[0150] R gear – reverse gear;

[0151] P position - parking position. DETAILED DESCRIPTION

[0152] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0153] like Figure 1 As shown, the power transmission and planetary differential steering device of the all-terrain vehicle includes an engine assembly 100 and a gearbox assembly 200 .

[0154] The engine assembly 100 includes an engine case 1 and an engine crankshaft assembly 2, and the gearbox assembly 200 includes a gearbox case 10 and a gearbox power input shaft assembly 11, the gearbox power input shaft assembly 11 is arranged in parallel with the engine crankshaft assembly 2, the gearbox countershaft assembly 12, the transition shaft assembly 13, and the power splitter shaft assembly 14 are all arranged in parallel with the gearbox countershaft assembly 12, the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158 are arranged in parallel with the power splitter shaft assembly 14, and the front output shaft assembly 16 is arranged vertically with the power splitter shaft assembly 14.

[0155] The engine crankshaft assembly 2 transmits power to the transmission power input shaft assembly 11 through the CVT driving wheel assembly 3, the transmission belt 6 and the CVT driven wheel assembly 7, and then decelerates and switches gears through the internal gears of the transmission, the shift switch plate, etc., and finally transmits power in two ways, one way is transmitted to the rear-drive left half-shaft assembly 157 and the rear-drive left half-shaft assembly 158 at the rear of the vehicle through the rear-drive planetary differential 15, and the other way is transmitted to the front output shaft assembly 16 of the vehicle through the bevel gear.

[0156] The transmission power input shaft assembly 11 is arranged in parallel with the engine crankshaft assembly 2, and the transmission power input shaft assembly 11 is provided with a high-speed driving gear 111, a reverse gear driving gear 112 and a low-speed driving gear 113, forming a whole. Among them, the gear of the low-speed driving gear 113 is Z1, the number of teeth of the reverse gear driving gear 112 is Z2, and the number of teeth of the high-speed driving gear 111 is Z3.

[0157] The gearbox countershaft assembly 12 is arranged in parallel with the gearbox power input shaft assembly 11, and the gearbox countershaft assembly 12 is provided with a parking gear 121, a countershaft driven gear 122, a high-speed driven gear 123, a reverse gear driven gear 124, a low-speed driven gear 125, a first shift fork shift switching disc 126 and a second shift fork shift switching disc 127. The first shift fork shift switching disc 126 and the second shift fork shift switching disc 127 are integrally connected with the gearbox countershaft assembly 12 through a spline connection, and the first shift fork shift switching disc 126 and the second shift fork shift switching disc 127 can slide axially relative to the gearbox countershaft assembly 12. The high-speed driven gear 123, the reverse gear driven gear 124, and the low-speed driven gear 125 are connected to the gearbox countershaft assembly 12 through bearings and can rotate freely. The high-speed driven gear 123 and the low-speed driven gear 125 are respectively engaged with the high-speed driving gear 111 and the low-speed driving gear 113 through gear meshing, and the reverse gear driven gear 124 transmits power to the reverse gear driving gear 112 through the reverse gear chain 114. Among them, the number of teeth of the low-speed driven gear 125 is Z4, the number of teeth of the reverse gear driven gear 124 is Z5, the number of teeth of the high-speed driven gear 123 is Z6, the number of teeth of the countershaft driven gear 122 is Z7, and the number of teeth of the parking gear 121 is Z8.

[0158] The transition shaft assembly 13 is arranged in parallel with the gearbox countershaft assembly 12, and is provided with a transition shaft output gear 131 and a transition shaft input gear 132 to form a whole. The transition shaft input gear 132 is meshed with the countershaft driven gear 122 to transmit power to the transition shaft output gear 131. The number of teeth of the transition shaft input gear 132 is Z9, and the number of teeth of the transition shaft output gear 131 is Z10.

[0159] The power split shaft assembly 14 is arranged in parallel with the transition shaft assembly 13, and is provided with a power split shaft input gear 141, a power split shaft rear drive driving gear 142, and a power split shaft front drive driving bevel gear 143, forming a whole. Among them, the number of teeth of the power split shaft input gear 141 is Z11, the number of teeth of the power split shaft rear drive driving gear 142 is Z12, and the number of teeth of the power split shaft front drive driving bevel gear 143 is Z13.

[0160] like Figure 2 , Figure 3 , Figure 4 and Figure 5As shown, the rear-drive planetary differential 15 comprises a rear-drive driven gear 151, a rear-drive planetary carrier assembly 152, a rear-drive planetary gear shaft 153, a rear-drive left planetary gear assembly 154, a rear-drive right planetary gear assembly 155, a rear-drive differential switching plate 156, a rear-drive left half-shaft assembly 157, a rear-drive right half-shaft assembly 158 and a planetary differential fastening bolt 159. The rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158 of the rear-drive planetary differential 15 are arranged in parallel with the power split shaft assembly 14.

[0161] The rear-drive planetary carrier assembly 152 is provided with a rear-drive planetary carrier assembly synchronous locking hole 1521; the rear-drive differential switching plate 156 is provided with a rear-drive differential switching plate fork groove 1561 and a rear-drive differential switching plate synchronous locking boss 1562; the rear-drive left half-shaft assembly 157 is provided with a rear-drive left half-shaft gear 1571, a rear-drive left half-shaft inner spline 1572 and a rear-drive left half-shaft synchronous locking hole 1573; the rear-drive right half-shaft assembly 158 is provided with a rear-drive right half-shaft gear 1581 and a rear-drive right half-shaft inner spline 1582. Through the connection between the rear-drive left half-shaft inner spline 1572 and the rear-drive right half-shaft inner spline 1582, the power of the system can be transmitted to the rear drive shaft of the vehicle to realize the rear wheel drive of the vehicle. The rear-drive driven gear 151 is meshed with the rear-drive driving gear 142 of the power split shaft through gears, the rear-drive planetary carrier assembly 152 is fixedly connected to the rear-drive driven gear 151 through the planetary differential fastening bolts 159 to form a whole, the rear-drive left planetary gear combination 154 and the rear-drive right planetary gear combination 155 are connected to the rear-drive planetary carrier assembly 152 rotating pair through the rear-drive planetary gear rotating shaft 153, the rear-drive left half-shaft gear 1571 on the rear-drive left half-shaft assembly 157 is meshed with the rear-drive left planetary gear combination 154, the rear-drive right planetary gear combination 155 is meshed with the rear-drive left planetary gear combination 154, and the rear-drive right half-shaft gear 1581 on the rear-drive right half-shaft assembly 158 is meshed with the rear-drive right planetary gear combination 155. Among them, the number of teeth of the rear drive driven gear 151 is Z14, the number of teeth of the rear drive left half-shaft gear 1571 and the rear drive right half-shaft gear 1581 are both Z15, and the number of teeth of the rear drive left planetary gear assembly 154 and the rear drive right planetary gear assembly 155 are both Z16.

[0162] In addition, the front output shaft assembly 16 is arranged vertically with the power split shaft assembly 14, and the front output shaft assembly 16 is provided with a front output shaft driven bevel gear 161 and a front output shaft spline 162, forming a whole. Through the front output shaft spline 162, the system power can be transmitted to the front drive shaft of the vehicle to realize the front wheel drive of the vehicle. Among them, the number of teeth of the front output shaft driven bevel gear 161 is Z17.

[0163] The following is an introduction to the continuously variable speed function of the power transmission and planetary differential steering device of the all-terrain vehicle.

[0164] like Figure 1As shown, the CVT drive pulley assembly 3 consists of a drive pulley fixing member 31, a drive pulley moving member 32, a drive pulley roller assembly 33, a drive pulley compression spring 34, a drive pulley limit block 35, etc., and is connected to the engine crankshaft assembly 2 through a drive pulley gasket 4 and a drive pulley bolt 5. Among them, the rotation direction of the drive pulley bolt 5 is opposite to the rotation direction of the engine crankshaft assembly 2, and the drive pulley fixing member 31 and the end of the engine crankshaft assembly 2 are tightly connected through a conical surface and a bolt. The CVT driven pulley assembly 7 consists of a driven pulley moving member 71, a driven pulley fixing member 72, a driven pulley compression spring 73, etc., is connected to the transmission power input shaft assembly 11 through a spline, and is fastened and limited through a driven pulley gasket 8 and a driven pulley bolt 9.

[0165] The rotation of the engine crankshaft assembly 2 drives the CVT drive pulley assembly 3 to rotate accordingly. As the rotational speed increases, the drive pulley roller assembly 33 radially pushes open under the action of centrifugal force. Since the position of the drive pulley fixing member 31 is fixed, the drive pulley roller assembly 33 pushes the drive pulley moving member 32 to move leftward, the drive pulley compression spring 34 is compressed, and the drive pulley limit block 35 limits the compression stroke of the drive pulley moving member 32 to be A. The drive pulley moving member 32 compresses and pushes the transmission belt 6 to move leftward synchronously through the V-shaped side contact and radially push open, that is, the radial radius of the transmission belt 6 at the drive pulley becomes larger. Since the total length of the transmission belt 6 remains unchanged and the center distance S between the engine crankshaft assembly 2 and the transmission power input shaft assembly 11 is a fixed value, the radial radius of the transmission belt 6 at the driven pulley becomes smaller, that is, the transmission belt 6 at the driven pulley radially contracts inward and moves leftward synchronously. Since the position of the driven pulley fixing member 72 is fixed, the transmission belt 6 compresses and pushes the driven pulley moving member 71 to move leftward through the V-shaped side, the driven pulley compression spring 73 is compressed, the limit stroke between the driven pulley moving member 71 and the driven pulley fixing member 72 is B, and the limit stroke between the driven pulley moving member 71 and the transmission power input shaft assembly 11 is C, where A < B < C. Thus, through the CVT drive pulley assembly 3, the CVT driven pulley assembly 7 and the transmission belt 6, the stepless speed change function from the output speed of the engine crankshaft assembly 2 to the input speed of the transmission power input shaft assembly 11 is realized. Preferably, the CVT stepless speed change component is installed on the right side of the engine, the center distance between the drive pulley and the driven pulley is S = 267 mm, the low speed ratio is 3.322, the high speed ratio is 0.787, and the speed ratio range is 3.322 / 0.787 = 4.2.

[0166] The following introduces the gear shifting process and speed ratio of the power transmission and planetary differential steering device of this all-terrain vehicle.

[0167] As Figure 1As shown, when the vehicle gear is in the N gear, the first fork shift switching plate 126 and the second fork shift switching plate 127 are both in the middle position, and are not engaged with the high-speed driven gear 123, the reverse gear driven gear 124, and the low-speed driven gear 125. At this time, the transmission countershaft assembly 12 does not transmit power.

[0168] When switching from the N gear to the H gear, the shift hub rotates forward by an angle θ1, and drives the first shift fork shift switching plate 126 to move a distance X1 from the initial position to the right through the shift drum profile, converting the rotational motion of the shift drum into the axial motion of the shift switching plate, so that the first shift fork shift switching plate 126 engages with the high-speed driven gear 123, that is, the high-speed driven gear 123 and the transmission countershaft assembly 12 form a whole, driving the transmission countershaft assembly 12 to rotate. At this time, the reverse driven gear 124 and the low-speed driven gear 125 are both idling relative to the gearbox countershaft assembly 12, and the power is transmitted from the high-speed driving gear 111 on the gearbox power input shaft assembly 11 to the countershaft driven gear 122 on the gearbox countershaft assembly 12, thereby driving the transition shaft output gear 131 on the transition shaft assembly 13 to rotate through the transition shaft input gear 132, and then driving the power split shaft rear drive driving gear 142 and the power split shaft front drive bevel gear 143 on the power split shaft assembly 14 to follow the rotation through the power split shaft input gear 141. Among them, one branch is that the rear drive driven gear 151 drives the rear drive planetary carrier assembly 152 to rotate, thereby driving the rear drive left half shaft assembly 157 and the rear drive right half shaft assembly 158 of the rear drive planetary differential 15 to rotate, realizing the differential steering or synchronous locking function; the other branch is that the front drive bevel gear 143 of the power split shaft drives the front output shaft driven bevel gear 161 to rotate, and transmits the power to the front axle assembly 500 through the front output shaft spline 162. At this time, the front and rear drive speed ratios are respectively:

[0169]

[0170] When switching from the H position to the L position, the shift hub continues to rotate forward by an angle θ 21 , the first shift fork shift switch plate 126 is driven to reset by the shift drum profile line, that is, it moves to the left by a distance X1, so that the first shift fork shift switch plate 126 is disengaged from the high-speed driven gear 123. Then, the shift hub continues to rotate forward by an angle θ 22, the second shift fork shift switch plate 127 is driven to move from the initial position to the right by a distance X2 through the shift drum profile line, so that the second shift fork shift switch plate 127 is meshed with the low-speed driven gear 125, that is, the low-speed driven gear 125 and the gearbox countershaft assembly 12 form a whole, driving the gearbox countershaft assembly 12 to rotate. At this time, the high-speed driven gear 123 and the reverse gear driven gear 124 are both idling relative to the gearbox countershaft assembly 12, and the power is transmitted from the low-speed driving gear 113 on the gearbox power input shaft assembly 11 to the countershaft driven gear 122 on the gearbox countershaft assembly 12. The power transmission at the rear of the gearbox is the same as that of the H gear, and will not be repeated. At this time, the front and rear drive speed ratios are:

[0171]

[0172] When switching from the N gear to the R gear, the shift hub rotates backward from the initial position to an angle of θ3, and drives the second shift fork shift switching plate 127 to move from the initial position to the left by a distance of X3 through the shift drum profile line, so that the second shift fork shift switching plate 127 is meshed with the reverse gear driven gear 124, that is, the reverse gear driven gear 124 and the gearbox countershaft assembly 12 form a whole, driving the gearbox countershaft assembly 12 to rotate. At this time, the high-speed driven gear 123 and the low-speed driven gear 125 are both idling relative to the gearbox countershaft assembly 12, and the power is transmitted from the reverse gear driving gear 112 on the gearbox power input shaft assembly 11 to the gearbox countershaft assembly 12 through the reverse gear chain 114. The subsequent power transmission of the gearbox is the same as that of the H gear and the L gear, and will not be repeated. At this time, the front and rear drive speed ratios are:

[0173]

[0174] When shifting from the R gear position to the P gear position, the shift hub continues to rotate backward from the R gear position by an angle θ4, and drives the second fork shift switching plate 127 to move to the right by a distance X3 through the shift drum profile, that is, the first fork shift switching plate 126 and the second fork shift switching plate 127 are both reset to the initial position. At this time, the high-speed driven gear 123, the reverse gear driven gear 124 and the low-speed driven gear 125 are all idle relative to the gearbox countershaft assembly 12. The shift drum pushes the parking toothed plate to mesh with the parking gear 121, inhibiting the rotation of the gearbox countershaft assembly 12, thereby realizing the parking function.

[0175] Preferably, in this example, θ1=57°, θ 21 =40°,θ 22 =47°, θ3=57°, θ4=87°, X1=6.5mm, X2=6.6mm, 10 =28, Z11 =43, Z 12 =14, Z 13 =21, Z 14 =48, Z 15 =33, Z 16 =12, Z 17 =20.

[0176] The following describes the implementation method of the rear drive differential switching function of the power transmission and planetary differential steering device of the all-terrain vehicle.

[0177] like Figure 1 As shown, taking the forward gear (H gear or L gear) as an example, the rotation directions of the engine crankshaft assembly 2, the transmission power input shaft assembly 11, the transmission countershaft assembly 12, the transition shaft assembly 13, the power splitter shaft assembly 14, the rear-drive driven gear 151 on the rear-drive planetary differential 15, and the front output shaft assembly 16 are as shown by the arrows in the figure.

[0178] like Figure 2 As shown, the rear-drive differential lock fork assembly 205 is arranged in parallel with the rear-drive left half-shaft assembly 157, and is provided with a rear-drive differential lock fork top rod 2052, a rear-drive differential lock fork 2053, a rear-drive differential lock compression spring 2054, a rear-drive differential lock compression spring limit seat 2055, and a rear-drive differential lock compression spring limit retaining ring 2056, and is connected to the rear-drive differential lock motor top rod 2041 through the rear-drive differential lock fork lock pin 2051. When the rear-drive differential lock motor top rod 2041 pushes out and drives the rear-drive differential lock fork top rod 2052 to move to the right, the rear-drive differential lock compression spring 2054 on the left side of the rear-drive differential lock fork 2053 is compressed, thereby pushing the rear-drive differential lock fork 2053 to move right, and then shifting the rear-drive differential switching plate 156 to move right, so that the rear-drive left half-shaft assembly 157 and the rear-drive planetary carrier assembly 152 form a whole; similarly, the rear-drive differential lock motor top rod 2041 contracts and drives the rear-drive differential lock fork top rod 2052 to move to the left, compressing the rear-drive differential lock compression spring 2054 on the right side of the rear-drive differential lock fork 2053, pushing the rear-drive differential lock fork 2053 to move left, so that the rear-drive left half-shaft assembly 157 is separated from the rear-drive planetary carrier assembly 152.

[0179] Figure 3The figure is a three-dimensional diagram of the rear-drive planetary differential mechanism. The rear-drive left planetary gear assembly 154 and the rear-drive right planetary gear assembly 155 revolve around the sun gear rotation center of the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158 through the rear-drive planetary gear rotating shaft 153, together with the rear-drive planetary carrier assembly 152 and the rear-drive driven gear 151. The rear-drive left planetary gear assembly 154 and the rear-drive left half-shaft assembly 157 are driven by gear meshing, the rear-drive right planetary gear assembly 155 and the rear-drive right half-shaft assembly 158 are driven by gear meshing, and the rear-drive left planetary gear assembly 154 and the rear-drive right planetary gear assembly 155 are also driven by gear meshing. The above four groups of gears are even-numbered coupled and driven, and ultimately the rotation directions of the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158 are opposite. Preferably, three groups of rear-drive left planetary gear assemblies 154 and three groups of rear-drive right planetary gear assemblies 155 are provided, and are evenly arranged at 120° about the rotation center of the sun gears of the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158 .

[0180] Figure 4 and Figure 5 They are respectively a left view of the rear-drive planetary differential mechanism and a schematic diagram of the plane principle of the planetary differential mechanism. In the differential state, the rear-drive left planetary gear assembly 154, the rear-drive right planetary gear assembly 155 and the rear-drive planetary gear shaft 153 revolve together with the rear-drive planetary carrier assembly 152 and the rear-drive driven gear 151 relative to the rotation center of the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158, and rotate around the rotation center of each rear-drive planetary gear shaft 153. Taking the forward gear (H gear or L gear) as an example, the power diversion shaft rear-drive driving gear 142 rotates backward, thereby driving the rear-drive driven gear 151 and the rear-drive planetary carrier assembly 152 to rotate forward. The rotation direction of the rear-drive left planetary gear assembly 154, the rear-drive left half-shaft assembly 157, the rear-drive right planetary gear assembly 155, and the rear-drive right half-shaft assembly 158 is shown by the arrow in the figure. Since the rotation centers of the rear-drive left planetary gear combination 154 and the rear-drive right planetary gear combination 155 rotating around the rear-drive planetary gear shaft 153 are on the same circumference, and the rear-drive left planetary gear combination 154 and the rear-drive right planetary gear combination 155 have the same number of teeth, and the rear-drive left half-shaft gear 1571 and the rear-drive right half-shaft gear 1581 have the same number of teeth, the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158 have the same rotation speed and opposite rotation direction, thereby realizing left and right reverse equal-speed drive.

[0181] like Figure 2 , Figure 3 and Figure 4As shown, when the voltage-stabilized power supply 201 is not connected, the rear-drive differential lock motor controller 203 and the rear-drive differential lock motor assembly 204 do not work, and the rear-drive differential lock motor push rod 2041 is in a rightward ejection state. At this time, the rear-drive differential switching disc 156 is pushed to the rightmost side by the rear-drive differential lock fork assembly 205, and the rear-drive differential switching disc synchronous locking boss 1562 simultaneously penetrates the rear-drive planetary carrier assembly synchronous locking hole 1521 of the rear-drive planetary carrier assembly 152 and the rear-drive left half-shaft synchronous locking hole 1573 of the rear-drive left half-shaft assembly 157, so that the rear-drive differential switching disc 156, the rear-drive left half-shaft assembly 157, the rear-drive planetary carrier assembly 152 and the rear-drive driven gear 151 form a whole without relative rotation. The rear-drive left planetary gear assembly 154 is meshed with the rear-drive left half-shaft assembly 157 through gears, and only revolves around the rotation center of the rear-drive left half-shaft assembly 157 (sun gear) without self-rotation; the rear-drive right planetary gear assembly 155 is meshed with the rear-drive left planetary gear assembly 154, and also has no self-rotation, and only revolves around the rear-drive right half-shaft assembly 158 (sun gear); the rear-drive right half-shaft assembly 158 is meshed with the rear-drive right planetary gear assembly 155 through the rear-drive right half-shaft gear 1581, and the rotation speed is the same as that of the rear-drive left half-shaft assembly 157, and in the same direction, that is, the output of the gearbox is a synchronous locking state of the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158.

[0182] When the vehicle voltage-stabilized power supply 201 is turned on, in the state where the rear-drive differential lock switching switch 202 is not pressed, the rear-drive differential lock motor controller 203 and the rear-drive differential lock motor assembly 204 are powered on and work. At this time, the rear-drive differential lock motor assembly 204 is powered on for self-test, and the rear-drive differential lock motor push rod 2041 first retracts to the left and then resets to the right. The rear-drive differential switching plate 156 forms a whole with the rear-drive left half-shaft assembly 157, the rear-drive planetary carrier assembly 152 and the rear-drive driven gear 151. The rear-drive left half-shaft assembly 157 does not rotate relative to the rear-drive planetary carrier assembly 152. Therefore, the rear-drive left planetary wheel assembly 154, the rear-drive right planetary wheel assembly 155 and the rear-drive right half-shaft assembly 158 also do not rotate relative to the rear-drive planetary carrier assembly 152. At this time, the output of the gearbox is a synchronous locking state of the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158.

[0183] It should be noted that the rear-drive differential lock switching switch 202 , the rear-drive differential lock motor controller 203 and the rear-drive differential lock motor assembly 204 constitute a rear-drive differential lock switching unit.

[0184] When the rear-drive differential lock switching switch 202 is pressed and turned on, the rear-drive differential lock motor controller 203 drives the rear-drive differential lock motor assembly 204 to work. At this time, the rear-drive differential lock motor top rod 2041 retracts to the left, and the rear-drive differential lock fork top rod 2052 moves to the left together. The rear-drive differential lock compression spring 2054 is compressed, thereby pushing the rear-drive differential lock fork 2053 to move to the left, and then pushing the rear-drive differential switching plate 156 to move to the left through the rear-drive differential switching plate fork slot 1561, so that the rear-drive differential switching plate synchronous locking boss 1562 is disengaged from the rear-drive left half-shaft synchronous locking hole 1573 on the rear-drive left half-shaft assembly 157. In this state, taking the forward gear (H gear or L gear) as an example, assuming that the rear-drive left half-shaft assembly 157 (sun gear) rotates clockwise, the rear-drive left planetary gear assembly 154 not only revolves around the sun gear but also rotates counterclockwise around the rear-drive planetary gear rotating shaft 153, and the rear-drive right planetary gear assembly 155 also not only revolves but also rotates clockwise around the rear-drive planetary gear rotating shaft 153. At this time, the rear-drive right half-shaft assembly 158 (sun gear) rotates counterclockwise, and because the number of gear meshing teeth is the same, the rear-drive right half-shaft assembly 158 and the rear-drive left half-shaft assembly 157 have the same rotation speed and opposite rotation direction, that is, the left The left wheel is driven backward and the right wheel is driven forward; assuming that the rear-drive left half-shaft assembly 157 rotates counterclockwise, the rotation directions of the rear-drive left planetary gear combination 154, the rear-drive right planetary gear combination 155 and the rear-drive right half-shaft assembly 158 are opposite to the above description. At this time, the left wheel is driven forward and the right wheel is driven backward; assuming that the rear-drive left half-shaft assembly 157 is stationary, the rear-drive left planetary gear combination 154 revolves around the sun gear while rotating counterclockwise, and the rear-drive right planetary gear combination 155 revolves and rotates clockwise. At this time, the rear-drive right half-shaft assembly 158 rotates counterclockwise, and the right wheel is driven forward. In the above three possible assumptions, the rear-drive left planetary gear combination 154 and the rear-drive right planetary gear combination 155 not only revolve around the center of the sun gear, but also rotate around the rear-drive planetary gear shaft 153, the rear-drive right half-shaft assembly 158 and the rear-drive left half-shaft assembly 157 have opposite rotation directions, and the output of the gearbox is the differential function state of the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158, which is suitable for use scenarios requiring differential steering.

[0185] It should be noted that the transmission assembly 200 is connected to the engine assembly 100 through the transmission connecting seat 300 to form a whole. The power output of the engine assembly 100 is transmitted to the transmission power input shaft assembly 11 of the transmission assembly 200 by the engine crankshaft assembly 2, the CVT driving wheel assembly 3, the transmission belt 6, and the CVT driven wheel assembly 7, and then divided into two paths to transmit power backward and forward respectively.

[0186] The rear part transmits power to the rear-drive left half-shaft assembly 157 and the rear-drive right half-shaft assembly 158 through the rear-drive planetary differential 15, and then the rear left drive shaft 610 and the rear right drive shaft 620 drive the rear left wheel 810 and the rear right wheel 820 to rotate respectively.

[0187] The front part transmits power to the universal joint assembly 400 through the front output shaft assembly 16, and then transmits power to the front left drive shaft 710 and the front right drive shaft 720 through the front axle assembly 500, thereby driving the front left wheel 910 and the front right wheel 920 to rotate.

[0188] Depend on Figure 6 and Figure 7 It can be seen that the power of the engine assembly 100 is transmitted to the front axle input connection plate 501 and the two-wheel drive / four-wheel drive switching plate connection sleeve 502 through the front universal joint 420. When the two-wheel drive / four-wheel drive switching switch 514 is not turned on, the two-wheel drive / four-wheel drive switching controller 515 and the two-wheel drive / four-wheel drive switching motor 516 do not work. At this time, the two-wheel drive / four-wheel drive switching plate 505 and the two-wheel drive / four-wheel drive switching plate connection sleeve 502 are in a separated state, and the vehicle is in a rear-wheel two-wheel drive state.

[0189] It should be noted that the two-wheel drive / four-wheel drive switching switch 514 , the two-wheel drive / four-wheel drive switching controller 515 and the two-wheel drive / four-wheel drive switching motor 516 constitute a two-wheel drive / four-wheel drive switching unit.

[0190] When the 2WD / 4WD switching switch 514 is turned on, the 2WD / 4WD switching controller 515 and the 2WD / 4WD switching motor work, and the 2WD / 4WD switching fork 517 drives the 2WD / 4WD switching disk 505 to slide along the spline on the front axle active bevel gear shaft 506, so that it meshes with the 2WD / 4WD switching disk connecting sleeve 502, and the power is transmitted to the front axle active bevel gear shaft 506 through the spline, and then transmitted to the front axle driven bevel gear 507 and the front axle differential housing 508 through gear meshing, and then drives the front axle planetary gear (front) 510, the front axle planetary gear (rear) 512, the front axle differential gear (left) 511 and the front axle differential gear (right) 513 to mesh and rotate through the front axle differential middle shaft 509, thereby driving the front left wheel 910 and the front right wheel 920 to rotate through the front left drive shaft 710 and the front right drive shaft 720. At this time, the vehicle is in a four-wheel drive state.

[0191] When the two-wheel drive / four-wheel drive switch 514 is turned on and the vehicle is in the four-wheel drive state, when the front-wheel drive differential lock switch 518 is not turned on, the front-wheel drive differential motor controller 519 and the front-wheel drive differential lock motor 520 do not work, and the front-wheel drive differential lock switch plate 522 and the front-axle differential switch plate connection seat 5081 on the front-axle differential housing 508 are in a separated state. In this state, the rotation directions of the front-axle active bevel gear shaft 506, the front-axle driven bevel gear 507, the front-axle differential housing 508, the front-axle planetary gear (front) 510, the front-axle planetary gear (rear) 512, the front-axle differential gear (left) 511, the front-axle differential gear (right) 513, and the front left drive shaft 710 and the front right drive shaft 720 are as follows: Figure 8 As shown, the vehicle is in the front drive differential state at this time.

[0192] It should be noted that the front-drive differential lock switching switch 518 , the front-drive differential motor controller 519 and the front-drive differential lock motor 520 constitute a front axle differential lock switching unit.

[0193] When the two-wheel drive / four-wheel drive switch 514 is turned on and the vehicle is in the four-wheel drive state, when the front-wheel drive differential lock switch 518 is turned on, the front-wheel drive differential motor controller 519 and the front-wheel drive differential lock motor 520 work, and the front-wheel drive differential lock switching plate 522 is driven to slide rightward along the spline on the front left drive shaft 710 through the front-wheel drive differential lock fork 521, so that it is engaged with the front-axle differential switch plate connecting seat 5081 on the front-axle differential housing 508. At this time, the front-axle differential gear (left) 511 forms a whole with the front left drive shaft 710, the front-axle differential lock switching plate 522 and the front-axle differential housing 508 through the spline, the front-axle planetary gear (front) 510 and the front-axle planetary gear (rear) 512 do not rotate, and the front-axle differential gear (right) 513 and the front-axle differential gear (left) 511 have the same rotation direction and the same speed, and the vehicle is in the front-axle differential lock state.

[0194] like Figure 8 As shown, the 2WD / 4WD switch of the vehicle includes a rear drive differential lock switch 202, a front drive differential lock switch 518, a 2WD / 4WD switch 514, and a 2WD / 4WD limit indicator knob 523. Among them, the front drive differential lock switch 518 (button A) is pressed to represent the front drive differential, and popped up to represent the front drive lock; the 2WD / 4WD switch 514 (button B) is pressed to represent the four-wheel drive (front axle motor is powered on), and popped up to represent the two-wheel drive (front axle motor is powered off); the rear drive differential lock switch 202 (button C) is pressed to represent the rear drive differential, and popped up to represent the rear drive lock.

[0195] The rear drive differential lock switch 202 is not affected by the position of the 2nd and 4th drive limit indicating knob 523 (knob D), and can be in any state of being pressed or popped up at any time. When the 2nd and 4th drive limit indicating knob 523 is turned to the right, the 2nd and 4th drive switch 514 must be in a pressed state first, and the front drive differential lock switch 518 can be in a pressed or popped up state, and the rear drive differential lock switch 202 is also in a two-choice state. At this time, there are four combinations, namely, the 4th drive rear differential lock front differential, the 4th drive rear differential front differential, the 4th drive rear differential lock front differential lock, and the 4th drive rear differential front differential lock. When the 2WD / 4WD limit indicator knob 523 is turned to the left, the front drive differential lock switch 518 must be in the pressed state first, and the 2WD / 4WD switch 514 can be pressed or popped up, and the rear drive differential lock switch 202 is not affected. At this time, there are also four combinations, namely, 2WD rear differential lock, 2WD rear differential, 4WD rear differential lock front differential, 4WD rear differential front differential, but the 2 states of 4WD are repeated. Therefore, the vehicle drive category and switch operation of this application have a total of 6 states, see Figure 8 and Fig. 9 .

[0196] like Fig. 9 As shown, when the vehicle is in a two-wheel drive rear differential lock state, the rear drive differential lock motor 204, the second four-wheel drive switching motor 516 and the front drive differential lock motor 520 are all in a power-off state; when the vehicle is in a two-wheel drive rear differential state, only the rear drive differential lock motor 204 on the gearbox assembly 200 is in a power-on state, while the second four-wheel drive switching motor 516 and the front drive differential lock motor 520 on the front axle assembly 500 are not powered; when the vehicle is in a four-wheel drive rear differential lock front differential state, only the second four-wheel drive switching motor 516 on the front axle assembly 500 is in a power-on state, while the rear drive differential lock motor 204 on the gearbox assembly 200 and the front drive differential lock motor 520 on the front axle assembly 500 are not powered; When the vehicle is in the four-wheel drive rear differential front differential state, the rear drive differential lock motor 204 on the gearbox assembly 200 and the second four-wheel drive switching motor 516 on the front axle assembly 500 are in a powered state, while the front drive differential lock motor 520 on the front axle assembly 500 is not powered; when the vehicle is in the four-wheel drive rear differential lock front differential lock state, the second four-wheel drive switching motor 516 and the front drive differential lock motor 520 on the front axle assembly 500 are in a powered state, while the rear drive differential lock motor 204 on the gearbox assembly 200 is not powered; when the vehicle is in the four-wheel drive rear differential lock front differential lock state, the rear drive differential lock motor 204, the second four-wheel drive switching motor 516 and the front drive differential lock motor 520 are all in a powered working state.

[0197] Under the premise of satisfying the continuously variable speed change function, the gearbox gear switching function, the rear-drive differential lock switching function, the front-drive differential lock switching function, and the whole vehicle power drive two-wheel drive and four-wheel drive switching function, the present invention can realize six drive mode control schemes through the combined logic control of the planetary differential steering mechanism and the front and rear drive differential locking system: two-wheel drive rear-drive lock, two-wheel drive rear-drive differential, four-wheel drive rear locking front differential, four-wheel drive rear differential front differential, four-wheel drive rear locking front locking, and four-wheel drive rear differential front locking, which effectively improves the adaptability of the all-terrain vehicle to complex roads and the off-road performance, and the performance is stable and reliable.

[0198] Obviously, the embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The drawings provide preferred embodiments of the present application, but do not limit the patent scope of the present application.

Claims

1. A power transmission and planetary differential steering device for an all-terrain vehicle, characterized in that: The power transmission and planetary differential steering device of the all-terrain vehicle comprises: An engine assembly (100), wherein the engine assembly (100) comprises an engine case (1) and an engine crankshaft assembly (2); A gearbox assembly (200), the gearbox assembly (200) comprising a gearbox housing (10) and a gearbox power input shaft assembly (11), a gearbox countershaft assembly (12), a transition shaft assembly (13), a power splitter shaft assembly (14), a rear-drive planetary differential (15) and a front output shaft assembly (16); A rear-drive differential lock switching unit, wherein the rear-drive differential lock switching unit is used to control the locking state of the rear-drive differential lock; A two-wheel drive / four-wheel drive switching unit, the two-wheel drive / four-wheel drive switching unit is used to control the all-terrain vehicle to switch between a two-wheel drive mode and a four-wheel drive mode; The front-drive differential lock switching unit is used to control the locking state of the front-drive differential lock.

2. The power transmission and planetary differential steering device for an all-terrain vehicle according to claim 1, characterized in that: The rear-drive differential lock switching unit comprises a rear-drive differential lock switching switch (202), a rear-drive differential lock motor controller (203) and a rear-drive differential lock motor assembly (204). The two-wheel drive / four-wheel drive switching unit comprises a two-wheel drive / four-wheel drive switching switch (514), a two-wheel drive / four-wheel drive switching controller (515) and a two-wheel drive / four-wheel drive switching motor (516). A front drive differential lock switching unit, the front drive differential lock switching unit comprising a front drive differential lock switching switch (518), a front drive differential motor controller (519) and a front drive differential lock motor (520).

3. The power transmission and planetary differential steering device for an all-terrain vehicle according to claim 2, characterized in that: The rear-drive differential lock switch (202) is button C, the two-wheel drive / four-wheel drive switch (514) is button B, and the front-drive differential lock switch (518) is button A. The button C, button B and button A are arranged in a triangle. A rotatable two-wheel drive or four-wheel drive limit indicating knob (523) is provided around the button C, and the two-wheel drive or four-wheel drive limit indicating knob (523) limits the pressing or popping up of the button B or the button A.

4. The power transmission and planetary differential steering device for an all-terrain vehicle according to claim 1, characterized in that: The engine crankshaft assembly (2) is provided with a CVT driving wheel assembly (3). The transmission power input shaft assembly (11) is arranged in parallel with the engine crankshaft assembly (2); the transmission power input shaft assembly (11) is provided with a CVT driven wheel assembly (7), a high-speed driving gear (111), a reverse gear driving gear (112), a low-speed driving gear (113) and a reverse chain (114); the CVT driven wheel assembly (7) is matched with the CVT driving wheel assembly (3) via a transmission belt (6); The gearbox countershaft assembly (12) is arranged in parallel with the gearbox power input shaft assembly (11), and the gearbox countershaft assembly (12) is provided with a parking gear (121), a countershaft driven gear (122), a high-speed driven gear (123), a reverse gear driven gear (124), a low-speed driven gear (125), a first shift fork shift switching plate (126) and a second shift fork shift switching plate (127). The transition shaft assembly (13) is arranged in parallel with the gearbox countershaft assembly (12), and the transition shaft assembly (13) is provided with a transition shaft output gear (131) and a transition shaft input gear (132). The power split shaft assembly (14) is arranged in parallel with the transition shaft assembly (13), and the power split shaft assembly (14) is provided with a power split shaft input gear (141), a power split shaft rear drive gear (142), and a power split shaft front drive bevel gear (143). The rear-drive planetary differential (15) comprises a rear-drive driven gear (151), a rear-drive planetary carrier assembly (152), a rear-drive planetary wheel shaft (153), a rear-drive left planetary wheel assembly (154), a rear-drive right planetary wheel assembly (155), a rear-drive differential switching plate (156), a rear-drive left half-shaft assembly (157), a rear-drive right half-shaft assembly (158) and a planetary differential fastening bolt (159). The rear-drive left half-shaft assembly (157) and the rear-drive right half-shaft assembly (158) are arranged in parallel with the power splitter shaft assembly (14). The front output shaft assembly (16) is arranged vertically to the power split shaft assembly (14), and the front output shaft assembly (16) is provided with a front output shaft driven bevel gear (161) and a front output shaft spline (162).

5. The power transmission and planetary differential steering device for an all-terrain vehicle according to claim 4, characterized in that: The first shift fork shift switching plate (126) and the second shift fork shift switching plate (127) are connected to the gearbox countershaft assembly (12) via a spline to form an integral body, and the first shift fork shift switching plate (126) and the second shift fork shift switching plate (127) can slide axially relative to the gearbox countershaft assembly (12); the high-speed driven gear (123), the reverse gear driven gear (124), and the low-speed driven gear (125) are connected via bearings and can rotate freely relative to the gearbox countershaft assembly (12); the high-speed driven gear (123) and the low-speed driven gear (125) are respectively meshed with the high-speed driving gear (111) and the low-speed driving gear (113) for transmission; the reverse gear driven gear (124) transmits power to the reverse gear driving gear (112) via a reverse gear chain (114); The transition shaft input gear (132) is meshed with the countershaft driven gear (122) and transmits power to the transition shaft output gear (131). The rear-drive planetary carrier assembly (152) is provided with a rear-drive planetary carrier assembly synchronous locking hole (1521); the rear-drive differential switching plate (156) is provided with a rear-drive differential switching plate fork groove (1561) and a rear-drive differential switching plate synchronous locking boss (1562); the rear-drive left half-shaft assembly (157) is provided with a rear-drive left half-shaft gear (1571), a rear-drive left half-shaft inner spline (1572) and a rear-drive left half-shaft synchronous locking hole (1573); The rear drive right half shaft assembly (158) is provided with a rear drive right half shaft gear (1581) and a rear drive right half shaft internal spline (1582); the rear drive driven gear (151) is meshed with the power split shaft rear drive driving gear (142) through gears; the rear drive planetary carrier assembly (152) is fixedly connected to the rear drive driven gear (151) through a planetary differential fastening bolt (159) to form a whole; the rear drive left planetary gear assembly (154) and the rear drive right planetary gear assembly (155) are connected to the rear drive driven gear (151) through a planetary differential fastening bolt (159); ) is connected to the rear drive planetary carrier assembly (152) through a rear drive planetary gear shaft (153); the rear drive left half-shaft gear (1571) on the rear drive left half-shaft assembly (157) is meshed with the gear of the rear drive left planetary gear assembly (154); the rear drive right planetary gear assembly (155) is meshed with the gear of the rear drive left planetary gear assembly (154); and the rear drive right half-shaft gear (1581) on the rear drive right half-shaft assembly (158) is meshed with the gear of the rear drive right planetary gear assembly (155).

6. The power transmission and planetary differential steering device for an all-terrain vehicle according to claim 5, characterized in that: The rear-drive planetary differential (15) transmits the power of the engine assembly (100) to the rear-drive left half-shaft assembly (157) and the rear-drive right half-shaft assembly (158); the rear-drive left half-shaft assembly (157) drives the rear left wheel (810), and the rear-drive right half-shaft assembly (158) drives the rear right wheel (820). The front output shaft assembly (16) transmits power from the engine assembly (100) to the universal joint assembly (400) and the front axle assembly (500); the front axle assembly (500) drives a front left drive shaft (710) and a front right drive shaft (720); the front left drive shaft (710) drives a front left wheel (910); and the front right drive shaft (720) drives a front right wheel (920).

Images