An all-wheel drive arrangement with low input torque for a skid steer loader

Abstract

The present invention discloses an all-wheel drive device with low input torque for a skid loader, and relates to the technical field of skid loaders. The present invention includes an electric motor arranged on the loader frame, and a driving gear for inputting low torque is arranged on the driving end of the electric motor, and also includes: an output unit, including an adjustment component and a torque-increasing component; two groups of travel units; each group of travel units is provided with a differential component and a constant speed component. The advantage is that the present invention only needs to use a single electric motor to input a lower torque, and can achieve a high-torque all-wheel drive output through the cooperation of the torque-increasing component, and can flexibly adjust the output size of the torque, and can flexibly realize the differential rotation or constant speed rotation of the wheels according to the driving state and driving position of the skid loader, so that the wheels of the skid loader can output a larger torque when driving in different states, and achieve stable driving under various complex road conditions, with better driving effect.

Description

Technical Field

[0001] The present invention relates to the technical field of skid-steer loaders, and in particular to an all-wheel drive device with low input torque for a skid-steer loader. Background Art

[0002] A skid steer loader is a small, multifunctional piece of engineering machinery with the characteristics of flexible steering, compact structure, and strong adaptability. It is widely used in construction, agriculture, municipal administration, and other fields. Skid steer loaders usually travel on dirt roads, ruins, and other areas with poor road conditions, requiring them to provide a large driving torque when traveling. In order to improve the driving ability of the skid steer loader, a drive device is required to improve its driving ability.

[0003] Existing drive devices use various methods to drive a skid steer loader, such as an all-wheel drive device with low input torque for a skid steer loader disclosed in Publication No. CN108797695A, in which a control unit is composed of a battery, an inverter, an electric joystick, and / or an electric hydraulic switch gear. Both sides of the controlled vehicle are composed of at least two wheels, wherein each wheel is connected to a planetary gear device, wherein the planetary gear device is connected via an infinite gear member on one side of the controlled vehicle, whereby the infinite gear member is connected to a single electric motor, whereby the electric motor is connected to the battery.

[0004] In actual use, existing drive devices usually use two sets of engines to drive the two rear wheels respectively, and drive the front wheel on the same side through a belt, or use four sets of engines to independently drive four wheels. These drive methods all require multiple sets of engines or electric motors, which are heavy and energy-consuming. At the same time, the wheel speeds of multiple sets of wheels cannot be accurately controlled.

[0005] For example, the prior art referenced above uses two sets of electric motors to simultaneously drive the rear wheels and cooperate with a belt to drive the front wheels. This not only increases the counterweight and consumes more energy, but also consumes more kinetic energy when the electric motor drives the rear wheels independently and transmits torque through the belt, making it impossible for the front wheels to output a large torque. At the same time, the wheel speeds of the front and rear wheels cannot be accurately controlled, and differential and constant speed control of the rear wheels or the front wheels of the same group cannot be achieved. As a result, when the front and rear wheels slip, they cannot output a large torque, resulting in poor escape ability.

[0006] Therefore, it is urgent to design an all-wheel drive device with low input torque for a skid steer loader to solve the above problems. Summary of the Invention

[0007] In view of the deficiencies of the prior art, the present invention provides an all-wheel drive device with low input torque for a skid steer loader, which solves the problems raised in the above background art.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: an all-wheel drive device with low input torque for a skid steer loader, comprising an electric motor on a loader frame, a drive gear for inputting low torque being provided on a drive end of the electric motor, and further comprising:

[0009] The output unit includes an adjustment component and a torque-increasing component, wherein the adjustment component is provided with a drive sprocket that cooperates with the drive gear, the adjustment component is used to adjust the magnitude of the output torque, and the torque-increasing component is used to achieve multi-stage torque increase of the output torque. The torque-increasing component is provided with an input gear for outputting high torque, and an output central shaft is provided on the loader frame, and the output central shaft is provided with an output gear that cooperates with the input gear;

[0010] Two sets of travel units are symmetrically arranged on both sides of the loader frame, and each set of travel units is provided with two wheels for traveling;

[0011] Each traveling unit is provided with a differential assembly and a constant speed assembly, wherein the differential assembly cooperates with the output central shaft to realize differential rotation of the two wheels, and the constant speed assembly cooperates with the output central shaft to realize constant speed rotation of the two wheels.

[0012] Preferably, an output box is fixedly mounted on the loader frame, and the adjustment assembly includes a hydraulic adjustment rod fixedly mounted on the output box, a speed regulating roller is rotatably mounted on the driving end of the hydraulic adjustment rod, a driving gear disc is fixedly mounted on the speed regulating roller, and the driving gear disc is engaged with the driving gear, and a speed regulating mechanism is installed between the speed regulating roller and the output box.

[0013] Preferably, the speed regulating mechanism includes a linkage shaft rotatably mounted in the output box, a small speed regulating toothed disc and a large speed regulating toothed disc are fixedly mounted on the linkage shaft, a small speed regulating gear and a large speed regulating gear are fixedly mounted on the speed regulating roller, and the small speed regulating gear cooperates with the large speed regulating toothed disc, and the large speed regulating gear cooperates with the small speed regulating toothed disc.

[0014] Preferably, the torque increasing assembly includes a central gear fixedly mounted on the linkage shaft, a mounting frame fixedly mounted in the output box, and a plurality of internal gears rotatably mounted on the mounting frame, the inner sides of the plurality of internal gears are all engaged with the central gear, and an output mechanism is mounted in the output box.

[0015] Preferably, the output mechanism includes an input shaft rotatably mounted in the output box, and an input gear fixedly mounted on the input shaft, a rotating frame fixedly mounted on the input shaft, and a reduction gear ring fixedly mounted on the rotating frame via a plurality of connecting rods, and the outer sides of the plurality of internal gears are all engaged with the inner side of the reduction gear ring.

[0016] Preferably, the differential assembly includes two wheel rollers rotatably mounted on the loader frame, and the two wheels are fixedly mounted on the two wheel rollers respectively. A differential is fixedly mounted on the loader frame, and the two wheel rollers are both matched with the differential. The end of the output center shaft is located in the differential and matched with the differential.

[0017] The differential is used to convert the rotation direction of the output shaft and drive the two wheel rollers to rotate, while automatically adjusting the rotation speed of the two wheel rollers so that the two wheels can travel at different speeds when turning.

[0018] Preferably, the constant speed assembly includes a support frame fixedly mounted on the loader frame, and a support shaft is rotatably mounted on the support frame, a universal joint is rotatably mounted on the output middle shaft, and the universal joint is rotatably mounted on the loader frame through a connecting frame, a steering gear for adjusting the rotation direction is fixedly mounted on the loader frame, and the steering gear cooperates with the support shaft, a locking mechanism is installed between the steering gear and the universal joint, and a linkage mechanism is installed between the support shaft and the two wheel rollers.

[0019] Preferably, the engaging mechanism comprises an electric telescopic rod rotatably mounted on the steering gear, and a engaging column is fixedly mounted on the electric telescopic rod, and a engaging cylinder is fixedly mounted on the universal joint, and the engaging cylinder rotates synchronously with the universal joint, and the engaging cylinder cooperates with the engaging column;

[0020] The output middle shaft drives the universal joint to rotate, the universal joint rotation drives the clamping cylinder to rotate, the clamping cylinder rotation drives the clamping column and the electric telescopic rod to rotate, and the rotation of the electric telescopic rod drives the support shaft to rotate with the cooperation of the internal structure of the steering gear.

[0021] Preferably, the linkage mechanism includes a linkage gear fixedly mounted on the support shaft, a linkage gear ring is mounted on the wheel roller via a positioning mechanism, and the linkage gear ring is meshed with the linkage gear.

[0022] Preferably, the positioning mechanism includes a fixed cylinder fixedly mounted on the wheel roller, a plurality of electric telescopic rods 2 are fixedly mounted on the fixed cylinder, and a positioning rod is fixedly mounted on each electric telescopic rod 2, and a plurality of positioning holes cooperating with the corresponding positioning rods are opened on the linkage gear ring.

[0023] The present invention provides an all-wheel drive device with low input torque for a skid steer loader. It has the following beneficial effects:

[0024] 1. When driving the wheels, this all-wheel drive device can achieve simultaneous driving of the front and rear four wheels by using a single electric motor, that is, achieving all-wheel drive. Compared with multiple drive devices in the existing technology, it has the advantages of lower cost and lower overall weight.

[0025] 2. When driving the wheels, this all-wheel drive device can flexibly adjust the torque output according to actual conditions by adopting an electric motor drive and coordinating the adjustment of the speed control mechanism, which can achieve both a small torque increase and a large torque increase, thereby achieving a stronger drive.

[0026] 3. When driving the wheels, this all-wheel drive device can perform multi-stage torque amplification on the low torque input by the motor through the cooperation of the torque amplification component and the electric motor, and output high torque to the output central shaft through the cooperation of the input gear and the output gear. It can achieve torque amplification and high output torque under low input torque, thereby improving the overall driving torque of the wheel, improving the wheel's grip and climbing performance.

[0027] 4. When driving the wheels, the all-wheel drive device can transmit the torque output from the output shaft to the two wheel rollers through the cooperation of the differential, and drive the two wheel rollers to rotate. When turning, the speed of the two wheel rollers can be flexibly adjusted according to the turning requirements to achieve smooth turning of the skid loader.

[0028] 5. When driving the wheels, this all-wheel drive device can lock the two wheel rollers through the cooperation of the constant speed component when the skid loader slips on muddy roads. Even if the two wheels rotate at the same speed, the overall torque of the wheels is further improved, and the torque and speed are evenly distributed, thereby improving the overall ability of the wheels to escape from difficulties.

[0029] To sum up, the present invention only needs to use a single electric motor to input a relatively low torque, and can achieve high-torque all-wheel drive output through the cooperation of the torque-increasing component. The output size of the torque can be flexibly adjusted, and the differential rotation or constant speed rotation of the wheels can be flexibly achieved according to the driving state and driving position of the skid loader, so that the wheels of the skid loader can output a larger torque when driving in different states, achieving stable driving under various complex road conditions and better driving effect.

[0030] Other features and advantages of the present invention will be described in the following description, and part of them will become obvious from the description, or will be understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0032] Figure 1 This is a schematic structural diagram of an all-wheel drive device with low input torque for a skid steer loader proposed by the present invention;

[0033] Figure 2 for Figure 1 Schematic diagram of the structure after rotating a certain angle;

[0034] Figure 3 for Figure 2 Schematic diagram of the structure of the motor and output box;

[0035] Figure 4 for Figure 3 Schematic diagram of the internal structure of the output box;

[0036] Figure 5 for Figure 4 Schematic diagram of the structure after removing the output box;

[0037] Figure 6 for Figure 5 Schematic diagram of the structural decomposition;

[0038] Figure 7 for Figure 6 Schematic diagram of the structure of the middle drive gear and linkage shaft;

[0039] Figure 8 for Figure 7 Schematic diagram of the structure after the speed is adjusted by the hydraulic regulating lever;

[0040] Figure 9 for Figure 6 and Figure 7 Comparison of top views before and after speed adjustment of the hydraulic adjustment lever;

[0041] Figure 10 for Figure 2 Schematic diagram of the structure of the middle wheel and wheel roller;

[0042] Figure 11 for Figure 10 Schematic diagram of the structure after removing two wheels;

[0043] Figure 12 for Figure 11 Schematic diagram of the structure of the middle output shaft and support frame;

[0044] Figure 13 for Figure 12 A magnified view of the structure of part A in the middle;

[0045] Figure 14 for Figure 11 Front view of the internal structure of the intermediate linkage gear ring.

[0046] In the figure: 1 loader frame, 2 wheels, 3 electric motor, 4 output middle shaft, 5 output box, 6 output gear, 7 drive gear, 8 hydraulic adjustment lever, 9 input gear, 10 input shaft, 11 rotating frame, 12 reduction gear ring, 13 linkage shaft, 14 speed regulating small gear plate, 15 speed regulating large gear plate, 16 mounting frame, 17 internal gear, 18 center gear, 19 speed regulating roller, 20 speed regulating small gear, 21 speed regulating large gear, 22 drive gear plate, 23 differential, 24 wheel roller, 25 support frame, 26 linkage gear, 27 linkage gear ring, 28 steering gear, 29 universal joint, 30 engaging cylinder, 31 engaging column, 32 electric telescopic rod 1, 33 fixing cylinder, 34 electric telescopic rod 2, 35 positioning hole. DETAILED DESCRIPTION

[0047] 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 only part of the embodiments of the present invention, rather than all the embodiments.

[0048] Example 1: Reference Figure 1-Figure 2 , an all-wheel drive device with low input torque for a skid steer loader, including an electric motor 3 arranged on a loader frame 1, and a drive gear 7 for inputting low torque is provided on the driving end of the electric motor 3. The electric motor 3 drives the drive gear 7 to rotate at a relatively high speed, and then inputs a relatively low torque through the drive gear 7 to drive the entire vehicle.

[0049] This all-wheel drive system also includes:

[0050] The output unit includes an adjustment component and a torque-increasing component. The adjustment component is used to receive the low torque input from the driving gear 7 and flexibly adjust the torque through the adjustment component. The torque-increasing component is used to perform secondary torque amplification on the input torque, thereby achieving low torque input and high torque output;

[0051] Two sets of travel units are symmetrically arranged on both sides of the loader frame 1. Each set of travel units is provided with two wheels 2 for traveling. The travel units cooperate with the output units to convert the input torque of the motor 3, thereby driving multiple wheels 2 to rotate simultaneously, realizing full drive of multiple wheels 2.

[0052] Example 2: Reference Figure 2-Figure 9 The difference between this embodiment and the first embodiment is that: a driving toothed disc 22 cooperating with the driving gear 7 is provided in the adjustment component, and the adjustment component is used to adjust the magnitude of the output torque to achieve automatic adjustment of the torque output;

[0053] The torque increasing assembly is used to achieve multi-stage torque increase of the output torque. An input gear 9 for outputting high torque is provided in the torque increasing assembly. An output central shaft 4 is provided on the loader frame 1, and an output gear 6 that cooperates with the input gear 9 is provided on the output central shaft 4.

[0054] An output box 5 is fixedly mounted on the loader frame 1. The adjustment assembly includes a hydraulic adjustment rod 8 fixedly mounted on the output box 5. A speed regulating roller 19 is rotatably mounted on the driving end of the hydraulic adjustment rod 8. A driving gear disc 22 is fixedly mounted on the speed regulating roller 19, and the driving gear disc 22 is meshed with the driving gear 7.

[0055] When the motor 3 is started, it drives the driving gear 7 to rotate. When the driving gear 7 rotates, it drives the driving toothed disc 22 to rotate, and then drives the speed regulating roller 19 to rotate synchronously. The tooth diameter of the driving toothed disc 22 is larger than the tooth diameter of the driving gear 7. That is, the driving gear 7 drives the driving toothed disc 22 to rotate at a reduced speed, thereby achieving a preliminary increase in torque.

[0056] A speed regulating mechanism is installed between the speed regulating roller 19 and the output box 5. The speed regulating mechanism includes a linkage shaft 13 rotatably installed in the output box 5. A small speed regulating toothed disc 14 and a large speed regulating toothed disc 15 are fixedly installed on the linkage shaft 13. A small speed regulating gear 20 and a large speed regulating gear 21 are fixedly installed on the speed regulating roller 19. The small speed regulating gear 20 cooperates with the large speed regulating toothed disc 15, and the large speed regulating gear 21 cooperates with the small speed regulating toothed disc 14.

[0057] When the speed regulating roller 19 rotates, it drives the speed regulating pinion 20 and the speed regulating gear 21 thereon to rotate synchronously. When the hydraulic adjustment lever 8 is activated, the speed regulating roller 19 is driven to extend or contract, thereby driving the speed regulating pinion 20, the speed regulating gear 21 and the driving gear plate 22 thereon to move synchronously. Since the width of the driving gear 7 is greater than the width of the driving gear plate 22, the driving gear plate 22 is always engaged with the driving gear 7 no matter how it moves, thereby always driving the speed regulating roller 19 to rotate synchronously.

[0058] As the instruction manual Figure 9 As shown on the left, when the speed regulating pinion 20 is engaged with the speed regulating large toothed disc 15, the speed regulating large gear 21 is not engaged with the speed regulating small toothed disc 14. At this time, the speed regulating roller 19 drives the speed regulating pinion 20 to rotate, thereby driving the speed regulating large toothed disc 15 and the linkage shaft 13 to rotate, thereby outputting a larger torque.

[0059] When the hydraulic regulating rod 8 drives the speed regulating roller 19 to move, it will be transformed into the instruction manual. Figure 9The state shown on the right side is that the speed regulating large gear 21 is engaged with the speed regulating small gear plate 14, and the speed regulating small gear 20 is not engaged with the speed regulating large gear plate 15. Since the tooth diameter of the speed regulating large gear 21 is larger than that of the speed regulating small gear 20, and the tooth diameter of the speed regulating small gear plate 14 is smaller than that of the speed regulating large gear plate 15, the torque applied by the speed regulating small gear 20 to the speed regulating small gear plate 14 is in a reduced state at this time, that is, the output torque is reduced and adjusted, which can be adjusted according to actual conditions and the output torque can be flexibly adjusted.

[0060] In a further embodiment, the torque increasing assembly includes a central gear 18 fixedly mounted on the linkage shaft 13, a mounting frame 16 fixedly mounted in the output box 5, and a plurality of internal gears 17 rotatably mounted on the mounting frame 16, the inner sides of the plurality of internal gears 17 all meshing with the central gear 18;

[0061] When the linkage shaft 13 rotates, it drives the central gear 18 thereon to rotate. When the central gear 18 rotates, it drives the multiple internal gears 17 meshing with it to rotate, thereby realizing the continued transmission of torque.

[0062] An output mechanism is installed in the output box 5. The output mechanism includes an input shaft 10 rotatably mounted in the output box 5, and an input gear 9 fixedly mounted on the input shaft 10. A rotating frame 11 is fixedly mounted on the input shaft 10, and a reduction gear ring 12 is fixedly mounted on the rotating frame 11 via multiple connecting rods. The outer sides of multiple internal gears 17 are all meshed with the inner side of the reduction gear ring 12.

[0063] When the multiple internal gears 17 rotate, they will synchronously drive the outer reduction gear ring 12 to rotate. Since the tooth diameter of the reduction gear ring 12 is much larger than the tooth diameter of the multiple internal gears 17, the internal gear 17 will apply a larger torque when driving the reduction gear ring 12 to rotate, that is, a larger torque increase is achieved;

[0064] When the reduction gear ring 12 rotates, it will drive the rotating frame 11 to rotate through multiple connecting rods. The rotation of the rotating frame 11 will drive the input shaft 10 to rotate. When the input shaft 10 rotates, it will drive the input gear 9 to rotate. When the input gear 9 rotates, it will drive the output gear 6 to rotate, and then drive the output central shaft 4 to rotate, thereby realizing the output of torque. At the same time, since the tooth diameter of the input gear 9 is smaller than the tooth diameter of the output gear 6, the torque can be amplified again, further realizing the torque increase, and a larger torque can be output through the output central shaft 4.

[0065] Example 3: Reference Figure 1-Figure 2 and 10- Figure 14 The technical solution of this embodiment is different from that of the second embodiment in that: a differential assembly and a constant speed assembly are provided in each traveling unit, wherein the differential assembly cooperates with the output middle shaft 4 to realize differential rotation of the two wheels 2, and the constant speed assembly cooperates with the output middle shaft 4 to realize constant speed rotation of the two wheels 2;

[0066] The differential assembly includes two wheel rollers 24 rotatably mounted on the loader frame 1, and the two wheels 2 are fixedly mounted on the two wheel rollers 24 respectively. A differential 23 is fixedly mounted on the loader frame 1, and the two wheel rollers 24 are matched with the differential 23. The end of the output center shaft 4 is located in the differential 23 and matched with the differential 23.

[0067] The rotation of the output middle shaft 4 will be transmitted to the differential 23, and the direction of rotation will be changed through the cooperation of the differential 23 to drive the two wheel rollers 24 to rotate together, which can drive the two wheels 2 to rotate synchronously. The differential 23 can automatically adjust the rotation speed of the two wheel rollers 24 to achieve differential rotation of the two wheels 2. This part of the component is mainly used for the skid loader to adjust the speed difference between the inner and outer wheels 2 of the curve through the differential 23 when turning, so as to achieve smooth rotation.

[0068] The differential 23 is used to convert the rotation direction of the output shaft 4 and drive the two wheel rollers 24 to rotate, while automatically regulating the rotation speed of the two wheel rollers 24 so that the two wheels 2 can travel at different speeds when turning;

[0069] The differential 23 is a device commonly used in the prior art for adjusting the rotation speed of the two wheel rollers 24. It can change the direction of rotation and drive the wheel rollers 24 to rotate, which can automatically adjust the rotation speed of the wheel rollers 24 to achieve differential transmission. This device is prior art and will not be described in detail here.

[0070] In a further embodiment, the constant speed assembly includes a support frame 25 fixedly mounted on the loader frame 1, and a support shaft is rotatably mounted on the support frame 25, a universal joint 29 is rotatably mounted on the output middle shaft 4, and the universal joint 29 is rotatably mounted on the loader frame 1 through a connecting frame, and a steering gear 28 for adjusting the rotation direction is fixedly mounted on the loader frame 1, and the steering gear 28 is matched with the support shaft;

[0071] If the skid loader slips while driving on a muddy or other complex road surface, the setting of the differential 23 will cause the torque to be distributed unevenly between the two wheels 2, that is, the wheel 2 on the slipping side will receive a larger torque, while the wheel 2 on the non-slipping side will receive a smaller torque, making it impossible for the skid loader to escape from trouble. Therefore, a constant speed component is required to balance the torque between the two wheels 2, achieve uniform rotation of the two wheels 2, and improve the overall escape ability.

[0072] At this time, the differential 23 can be closed so that the rotation of the two wheel rollers 24 is not affected by the differential 23. At this time, when the output shaft 4 rotates, the universal joint 29 will be driven to rotate.

[0073] A locking mechanism is installed between the steering gear 28 and the universal joint 29. The locking mechanism includes an electric telescopic rod 32 rotatably mounted on the steering gear 28, and a locking column 31 is fixedly mounted on the electric telescopic rod 32. A locking cylinder 30 is fixedly mounted on the universal joint 29. The locking cylinder 30 rotates synchronously with the universal joint 29 and cooperates with the locking column 31.

[0074] Then, the electric telescopic rod 1 32 is started to drive the engaging column 31 to move, so that the engaging column 31 moves and engages in the engaging tube 30 .

[0075] The output middle shaft 4 drives the universal joint 29 to rotate, the rotation of the universal joint 29 drives the locking cylinder 30 to rotate, the rotation of the locking cylinder 30 drives the locking column 31 and the electric telescopic rod 32 to rotate, and the rotation of the electric telescopic rod 32 drives the support shaft to rotate in cooperation with the internal structure of the steering gear 28;

[0076] A linkage mechanism is installed between the support shaft and the two wheel rollers 24. The linkage mechanism includes a linkage gear 26 fixedly installed on the support shaft. A linkage gear ring 27 is installed on the wheel roller 24 through a positioning mechanism, and the linkage gear ring 27 is meshed with the linkage gear 26.

[0077] When the support shaft rotates, it will drive the linkage gear 26 on it to rotate. When the linkage gear 26 rotates, it will drive the linkage gear ring 27 engaged with it to rotate synchronously. Both linkage gear rings 27 are rotatably connected to the loader frame 1, and the loader frame 1 is used to limit the linkage gear ring 27.

[0078] The positioning mechanism includes a fixed cylinder 33 fixedly mounted on the wheel roller 24, and a plurality of electric telescopic rods 34 are fixedly mounted on the fixed cylinder 33, and each electric telescopic rod 34 is fixedly mounted on a positioning rod, and a plurality of positioning holes 35 are opened on the linkage gear ring 27 to cooperate with the corresponding positioning rods;

[0079] When the vehicle is rotating at a constant speed, the second electric telescopic rod 34 on the fixed cylinder 33 is started to move the positioning rod, and the positioning rod is moved while rotating slowly until the positioning rod is engaged with the positioning hole 35 in the linkage gear ring 27. At this time, when the linkage gear ring 27 rotates, the fixed cylinder 33 and the wheel roller 24 are driven to rotate together through the cooperation of the multiple positioning rods.

[0080] That is, the rotation of the support shaft drives the fixed cylinder 33 to rotate through the cooperation of the linkage gear 26, the linkage gear ring 27 and the positioning rod, and then drives the two wheel rollers 24 to rotate. Since the rotation speed of the linkage gear 26 is the same, that is, the rotation speed of the two wheel rollers 24 is the same as that of the wheel 2, constant speed rotation is achieved, and then the torque is evenly distributed. At this time, when one wheel 2 slips, the torque of the other wheel 2 can be effectively increased through the even distribution of torque, and the drive out of trouble can be achieved through the other wheel 2, thereby significantly improving the overall escape capability of the skid loader.

[0081] The specific driving principle of this all-wheel drive device is as follows: the motor 3 starts to drive the driving gear 7 to rotate, and when the driving gear 7 rotates, it drives the driving sprocket 22 to rotate, and then drives the speed regulating roller 19 to rotate synchronously. The tooth diameter of the driving sprocket 22 is larger than the tooth diameter of the driving gear 7, that is, the driving gear 7 drives the driving sprocket 22 to rotate to reduce speed, thereby achieving a preliminary increase in torque;

[0082] When the speed regulating roller 19 rotates, the torque is synchronously adjusted through the cooperation of the speed regulating mechanism, thereby driving the linkage shaft 13 to rotate. When the linkage shaft 13 rotates, it drives the central gear 18 on it to rotate. When the central gear 18 rotates, it drives the multiple internal gears 17 meshing with it to rotate.

[0083] When the multiple internal gears 17 rotate, they will synchronously drive the outer reduction gear ring 12 to rotate. Since the tooth diameter of the reduction gear ring 12 is much larger than the tooth diameter of the multiple internal gears 17, the internal gear 17 will apply a larger torque when driving the reduction gear ring 12 to rotate, that is, a larger torque increase is achieved;

[0084] When the reduction gear ring 12 rotates, it will drive the rotating frame 11 to rotate through multiple connecting rods. The rotation of the rotating frame 11 will drive the input shaft 10 to rotate. When the input shaft 10 rotates, it will drive the input gear 9 to rotate. When the input gear 9 rotates, it will drive the output gear 6 to rotate, and then drive the output central shaft 4 to rotate, thereby realizing the output of torque. At the same time, since the tooth diameter of the input gear 9 is smaller than the tooth diameter of the output gear 6, the torque can be amplified again, further realizing the torque increase, and a larger torque can be output through the output central shaft 4.

[0085] The rotation of the output middle shaft 4 is transmitted to the differential 23, and the direction of rotation is changed by the cooperation of the differential 23, thereby driving the two wheel rollers 24 to rotate together, which can drive the two wheels 2 to rotate synchronously. The differential 23 can automatically adjust the rotation speed of the two wheel rollers 24 to achieve differential rotation of the two wheels 2. This component is mainly used for the skid steer loader to adjust the speed difference between the inner and outer wheels 2 of the curve through the differential 23 when turning, so as to achieve smooth rotation.

[0086] If the skid loader slips while driving on a muddy or other complex road surface, the differential 23 can be closed so that the rotation of the two wheel rollers 24 is not affected by the differential 23. At this time, the rotation of the output shaft 4 will drive the universal joint 29 to rotate, and then the electric telescopic rod 1 32 will be started to drive the engaging column 31 to move, so that the engaging column 31 moves and engages with the engaging cylinder 30. When the support shaft rotates, the linkage gear 26 on it will rotate, and when the linkage gear 26 rotates, the linkage gear ring 27 meshing with it will rotate synchronously.

[0087] When the vehicle is rotating at a constant speed, the second electric telescopic rod 34 on the fixed cylinder 33 is started to move the positioning rod, and the positioning rod is moved while rotating slowly until the positioning rod is engaged with the positioning hole 35 in the linkage gear ring 27. At this time, when the linkage gear ring 27 rotates, the fixed cylinder 33 and the wheel roller 24 are driven to rotate together through the cooperation of the multiple positioning rods.

[0088] That is, the rotation of the support shaft drives the fixed cylinder 33 to rotate through the cooperation of the linkage gear 26, the linkage gear ring 27 and the positioning rod, and then drives the two wheel rollers 24 to rotate. Since the rotation speed of the linkage gear 26 is the same, that is, the rotation speed of the two wheel rollers 24 is the same as that of the wheel 2, constant speed rotation is achieved, and then the torque is evenly distributed. At this time, when one wheel 2 slips, the torque of the other wheel 2 can be effectively increased through the even distribution of torque, and the drive out of trouble can be achieved through the other wheel 2, thereby significantly improving the overall escape capability of the skid loader.

[0089] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. An all-wheel drive device with low input torque for a skid steer loader, comprising an electric motor (3) arranged on a loader frame (1), and a drive gear (7) for inputting low torque is arranged on a driving end of the electric motor (3), characterized in that: Also includes: An output unit comprises an adjusting component and a torque increasing component, wherein a driving sprocket (22) matching with a driving gear (7) is provided in the adjusting component, the adjusting component is used to adjust the magnitude of the output torque, the torque increasing component is used to achieve multi-stage torque increase of the output torque, an input gear (9) for outputting high torque is provided in the torque increasing component, an output middle shaft (4) is provided on the loader frame (1), and an output gear (6) matching with the input gear (9) is provided on the output middle shaft (4); Two groups of traveling units are symmetrically arranged on both sides of the loader frame (1), and each group of traveling units is provided with two wheels (2) for traveling; Each traveling unit is provided with a differential assembly and a constant speed assembly, wherein the differential assembly cooperates with the output center shaft (4) to realize differential rotation of the two wheels (2), and the constant speed assembly cooperates with the output center shaft (4) to realize constant speed rotation of the two wheels (2); The constant speed assembly includes a support frame (25) fixedly mounted on the loader frame (1), and a support shaft is rotatably mounted on the support frame (25), a universal joint (29) is rotatably mounted on the output middle shaft (4), and the universal joint (29) is rotatably mounted on the loader frame (1) through a connecting frame, a steering gear (28) for adjusting the rotation direction is fixedly mounted on the loader frame (1), and the steering gear (28) is matched with the support shaft, a locking mechanism is installed between the steering gear (28) and the universal joint (29), and a linkage mechanism is installed between the support shaft and the two wheel rollers (24); The engaging mechanism comprises an electric telescopic rod (32) rotatably mounted on the steering gear (28), and a engaging column (31) is fixedly mounted on the electric telescopic rod (32), and a engaging cylinder (30) is fixedly mounted on the universal joint (29), and the engaging cylinder (30) rotates synchronously with the universal joint (29), and the engaging cylinder (30) cooperates with the engaging column (31); The linkage mechanism comprises a linkage gear (26) fixedly mounted on a support shaft, a linkage gear ring (27) is mounted on the wheel roller (24) via a positioning mechanism, and the linkage gear ring (27) is meshed with the linkage gear (26).

2. The all-wheel drive device with low input torque for a skid steer loader according to claim 1, characterized in that: An output box (5) is fixedly mounted on the loader frame (1), and the adjustment assembly includes a hydraulic adjustment rod (8) fixedly mounted on the output box (5). A speed regulating roller (19) is rotatably mounted on the driving end of the hydraulic adjustment rod (8), a driving gear disc (22) is fixedly mounted on the speed regulating roller (19), and the driving gear disc (22) is meshed with the driving gear (7), and a speed regulating mechanism is installed between the speed regulating roller (19) and the output box (5).

3. The all-wheel drive device with low input torque for a skid steer loader according to claim 2, wherein: The speed regulating mechanism comprises a linkage shaft (13) rotatably mounted in the output box (5), a small speed regulating toothed disc (14) and a large speed regulating toothed disc (15) being fixedly mounted on the linkage shaft (13), a small speed regulating gear (20) and a large speed regulating gear (21) being fixedly mounted on the speed regulating roller (19), and the small speed regulating gear (20) cooperates with the large speed regulating toothed disc (15), and the large speed regulating gear (21) cooperates with the small speed regulating toothed disc (14).

4. The all-wheel drive device with low input torque for a skid steer loader according to claim 3, characterized in that: The torque increasing assembly includes a central gear (18) fixedly mounted on a linkage shaft (13); a mounting frame (16) is fixedly mounted in the output box (5); and a plurality of internal gears (17) are rotatably mounted on the mounting frame (16); the inner sides of the plurality of internal gears (17) are all meshed with the central gear (18); and an output mechanism is mounted in the output box (5).

5. The all-wheel drive device with low input torque for a skid steer loader according to claim 4, characterized in that: The output mechanism comprises an input shaft (10) rotatably mounted in an output box (5), and an input gear (9) fixedly mounted on the input shaft (10), a rotating frame (11) fixedly mounted on the input shaft (10), and a reduction gear ring (12) fixedly mounted on the rotating frame (11) via a plurality of connecting rods, and the outer sides of the plurality of internal gears (17) are all meshed with the inner sides of the reduction gear ring (12).

6. The all-wheel drive device with low input torque for a skid steer loader according to claim 1, characterized in that: The differential assembly comprises two wheel rollers (24) rotatably mounted on a loader frame (1), and two wheels (2) are fixedly mounted on the two wheel rollers (24), respectively; a differential (23) is fixedly mounted on the loader frame (1), and both wheel rollers (24) cooperate with the differential (23); an end portion of the output center shaft (4) is located in the differential (23) and cooperates with the differential (23); The differential (23) is used to convert the rotation direction of the output center shaft (4) and drive the two wheel rollers (24) to rotate, while automatically regulating the rotation speed of the two wheel rollers (24) so ​​that the two wheels (2) can travel at different rotation speeds when turning.

7. The all-wheel drive device with low input torque for a skid steer loader according to claim 6, characterized in that: The output center shaft (4) drives the universal joint (29) to rotate, the universal joint (29) drives the engagement cylinder (30) to rotate, the engagement cylinder (30) drives the engagement column (31) and the electric telescopic rod (32) to rotate, and the electric telescopic rod (32) drives the support shaft to rotate in cooperation with the internal structure of the steering gear (28).

8. The all-wheel drive device with low input torque for a skid steer loader according to claim 7, characterized in that: The positioning mechanism comprises a fixed cylinder (33) fixedly mounted on the wheel roller (24), a plurality of electric telescopic rods (34) fixedly mounted on the fixed cylinder (33), and a positioning rod fixedly mounted on each electric telescopic rod (34), and a plurality of positioning holes (35) cooperating with the corresponding positioning rods are formed on the linkage gear ring (27).

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