CN209519345U - A carbon-free car driven by gravitational potential energy around a double figure-of-eight trajectory - Google Patents

Abstract

The utility model relates to a carbon-free trolley driven by gravitational potential energy and travels around double 8-shaped tracks, which comprises: a vehicle frame, a power conversion mechanism arranged on the vehicle frame, a transmission device arranged on the vehicle frame, and a The steering mechanism on the frame, the transmission device includes a vertical transmission device and a horizontal transmission device, and the steering mechanism includes: a crank rocker mechanism, an incomplete gear set and a steering wheel. The utility model realizes the effect of three-stage amplified transmission ratio, so that when the weight falls for the same distance, the rear wheel can rotate for more turns, and can control the deflection range of the steering wheel in a large range. Bolts can be fast fixed at different positions. The utility model travels on double 8-shaped tracks of different sizes, has stable transmission, and the design of the steering mechanism is exquisite and reliable, and has good application prospects.

Description

A carbon-free car driven by gravitational potential energy around a double figure-of-eight trajectory

technical field

The utility model relates to a track-adjustable carbon-free trolley, in particular to a carbon-free trolley driven by gravitational potential energy and traveling around a double-eight track.

Background technique

At present, the energy problem is a worldwide problem. Exploring the design of carbon-free cars can help college students cultivate their awareness of energy conservation and environmental protection. The design and manufacture of carbon-free cars can cultivate students' mechanical design and processing skills. In the design process of the carbon-free trolley, it is necessary to consider the conversion and utilization of the gravity potential energy of heavy objects. In order to make the trolley travel a longer distance, it is necessary to design a device that increases the transmission ratio. When the power is constant, the larger the transmission ratio, the more difficult it is for the car to start, or even unable to drive; if the transmission ratio is too small, the car will accelerate too fast, the stability will be poor, the driving distance of the car will be too short, and the potential energy will not be fully utilized. In addition, the steering mechanism is also an important part of the trolley. On the one hand, it is necessary to design a mechanism that can follow the double-eight trajectory; Uncertainty, for this design can fine-tune the mechanism to meet the requirements of different trajectories. The traditional carbon-free trolley track is a single figure 8. For example, the patented "carbon-free trolley with figure 8 walking" (patent number CN 206652241U) has problems such as a relatively simple steering mechanism, the inability to drive on a double figure 8 track, and the car's driving distance is relatively short. .

Utility model content

In order to solve the deficiencies of the existing technology, the utility model provides a carbon-free trolley that is driven by the potential energy of gravity and travels around the double 8-shaped trajectory. , the rear wheels can be turned to give more turns. The length of the crank and the length of the rocker in the crank-rocker mechanism can be adjusted, which can control the deflection range of the steering wheel in a large range, and realize double-eight trajectories of different sizes. The car plate is provided with grooves, and fast fixing at different positions can be realized through bolts. The utility model travels double 8-shaped tracks of different sizes, has stable transmission, and the design of the steering mechanism is compact and reliable, and has good application prospects.

The purpose of this utility model is achieved through the following technical solutions:

A carbon-free trolley driven by gravitational potential energy and traveling around a double 8-shaped trajectory, comprising: a frame, a power conversion mechanism arranged on the frame, a transmission device arranged on the frame, and a The steering mechanism on the vehicle frame, the transmission device includes a vertical transmission device and a horizontal transmission device, the steering mechanism includes: a crank rocker mechanism, an incomplete gear set and a steering wheel, and the power conversion mechanism is connected to the vertical transmission device. The transmission device is transmission connected, the vertical transmission device is transmission connected to the horizontal transmission device, the horizontal transmission device is transmission connection to the incomplete gear set, the crank rocker mechanism is rotationally connected to the steering wheel, and the incomplete The gear set is connected to the crank-rocker mechanism through transmission. The rotation of the incomplete gear set drives the crank-rocker mechanism to swing. The position of the crank-rocker mechanism changes, which drives the deflection angle and deflection range of the steering wheel to change.

Based on the above technical solution, the power conversion mechanism converts the gravitational potential energy into kinetic energy, thereby providing energy to the entire trolley. The transmission device realizes three accelerations of the trolley through the ratio of the radius and the number of gears, and realizes the acceleration of the vertical plane. The movement is converted into the movement in the horizontal direction, the steering mechanism realizes the rotation of the trolley, and realizes the fine adjustment of the wheel deflection angle and deflection range through the fine adjustment mechanism.

Further, the power conversion mechanism includes a weight block and a first rope, the weight block is fixedly connected to one end of the first rope, and the power conversion mechanism converts the gravitational potential energy of the weight block into the The kinetic energy of the transmission.

Based on the above technical solution, the weight block descends, and the gravitational potential energy provided by it is converted into the kinetic energy of the transmission device.

Further, the vertical transmission device includes: a winding disk, a second rope, a gear winding shaft, a large gear, a pinion, a rear axle, a rear wheel and a horizontal bevel gear, and the winding disk includes: a small winding groove and the large winding groove, the small winding groove and the large winding groove are coaxial, the other end of the first rope is connected to the small winding groove, and the second rope is wound on the large winding groove one end of the second rope, the other end of the second rope is connected to the middle part of the gear winding shaft, and a large gear is arranged at one end of the gear winding shaft, and the large gear meshes with the small gear, and the small gear is arranged on the rear wheel shaft. The wheel shaft is connected to the rear wheel, and the other end of the gear winding shaft is provided with a horizontal bevel gear. The weight block descends to drive the winding disk to rotate, drive the large winding groove to rotate, drive the second rope, and pull the The gear rotates around the spool, and drives the large gear and the horizontal bevel gear to rotate at the same time. The rotation of the large gear drives the small gear to rotate, and drives the rear wheel to rotate. The horizontal bevel gear converts the motion in the vertical plane into movement in the horizontal plane of the horizontal transmission.

Based on the above technical solution, the weight block lowers and pulls the first rope, drives the small winding slot to rotate, thereby drives the winding disk to rotate, further drives the large winding slot to rotate, thereby pulls the second rope, and further pulls the large gear to rotate , to complete the first acceleration (the transmission ratio is equal to the diameter of the large winding groove divided by the diameter of the small winding groove), and then the large gear rotates to drive the small gear to rotate, which further drives the rear wheel to rotate to complete the second acceleration (the transmission ratio is equal to diameter of the large gear divided by the diameter of the pinion).

Further, the horizontal transmission device includes a vertical bevel gear and a first vertical shaft, the vertical bevel gear meshes with the horizontal bevel gear, and the vertical bevel gear is arranged at one end of the first vertical shaft.

Based on the above technical scheme, the power is transmitted from the horizontal bevel gear to the vertical bevel gear, that is, the motion in the vertical plane is changed into the motion in the horizontal plane, and the third acceleration is realized at the same time, (the transmission ratio is equal to the number of teeth of the horizontal bevel gear divided by the vertical number of teeth of a straight bevel gear).

Further, the incomplete gear set includes incomplete gears, the incomplete gears are arranged on the other end of the first vertical shaft, the incomplete gears mesh with complete gears, and the complete gears are arranged on the second vertical axis. One end of the straight shaft, the second vertical shaft is connected to the crank rocker mechanism.

Based on the above technical solution, the rotation of the first vertical shaft drives the incomplete gear to rotate, thereby intermittently drives the complete gear to rotate, further drives the second vertical shaft to rotate, and further drives the crank disc to rotate.

Further, the crank-rocker mechanism also includes a crank plate, a connecting rod and a rocker, the crank plate is arranged at the other end of the second vertical shaft, and the lower end of the crank plate is rotatably connected to the One end of the connecting rod, a first movable chute is set on the crank plate, the first changing pin is rotatably connected to the first movable chute, and the other end of the connecting rod is rotatably connected to the second changing pin. One end of the rocker, a second movable chute is opened on the connecting rod, and the second changing pin is rotatably connected to the second movable chute.

Further, the steering mechanism further includes a wheel frame, the other end of the rocker is fixedly connected to the wheel frame, and the lower end of the wheel frame is connected to the steering wheel.

Based on the above technical solution, the rotation of the crank disc drives the connecting rod to move in a plane, and the connecting rod further pushes the rocker, thereby driving the steering wheel to swing. By changing the position of the first change pin to change the length of the actual work of the crank plate, by changing the position of the second change pin to change the length of the actual work of the connecting rod, by changing the length of these two parts, the steering wheel can be changed Deflection angle and deflection range.

Further, the wheel frame is fixedly connected to the vehicle board through the fixing piece.

Further, the left and right ends of the gear winding shaft are fixed on the vehicle board through the first support, the left and right ends of the rear axle are fixed on the vehicle board through the second support, and on the vehicle board A support fixing groove is provided, and the first support and the second support are fixed inside the support fixing groove by bolts.

Based on the above technical solution, the position of the support can be adjusted arbitrarily in the fixing groove of the support.

Further, the power conversion mechanism, the transmission device and the incomplete gear set are arranged above the vehicle board, and the crank rocker mechanism is arranged below the vehicle board.

The beneficial effects of the utility model are:

1. Through the reversing action of the bevel gear, the motion in the vertical plane is transmitted to the horizontal plane, that is, the power is transmitted to the incomplete gear set. After designing the parameters of the incomplete gear set, it can be realized by cooperating with the crank rocker mechanism. The wheels swing intermittently and regularly, so that the car can go out of the expected track. In addition, both the crank plate and the connecting rod are provided with movable slide grooves, respectively adjusting the position of the first change pin in the first slide groove on the crank plate and the second change pin in the second movable slide groove on the connecting rod. position, the length of the crank plate and connecting rod can be adjusted separately. Changing the length of the crank can change the maximum angle range of the steering wheel; changing the length of the connecting rod can change the initial angle of the steering wheel, and then change the range of the swinging angle of the steering wheel, so that the car can adapt to different distances of the limit piles . And the incomplete gear set is arranged on the top of the vehicle plate, and the crank-rocker mechanism formed by the crank plate, the connecting rod and the rocker is below the vehicle plate, which can not only realize the steering function, but also make the structure more stable.

2. A winding disk composed of a large winding groove and a small winding groove is used to drive the large gear and the small gear, and the three sets of reversing bevel gear sets work together to increase the number of turns of the rear wheel by multiple times. resulting in a larger transmission ratio. Because the transmission is relatively large after the three-stage doubling, the trolley needs a lot of force to drive when it starts to walk, so there is a tapered section on the winding gear shaft with the driving gear, and the second rope is from the part with the smallest radius to the radius. The largest part begins to wind up. When the car starts, the second rope is located at the place with the largest radius, which can provide a larger torque and make it easier to start the car; The torque can be driven, so that the rear wheels can rotate more circles, saving energy.

Description of drawings

Concrete structure of the present utility model is provided by following embodiment and accompanying drawing thereof.

Fig. 1 is a schematic diagram of the overall structure of the carbon-free trolley driven by the gravitational potential energy of the utility model and traveling around a double figure-of-eight trajectory.

Fig. 2 is a schematic diagram of the overall structure of the carbon-free trolley driven by the gravitational potential energy of the utility model and traveling around a double figure-of-eight trajectory.

Fig. 3 is a schematic diagram of the overall structure of the carbon-free trolley driven by the gravitational potential energy of the utility model and traveling around a double figure-eight trajectory.

Figure 1-3, the list of parts represented by each label is as follows:

1, vehicle frame, 2, power conversion mechanism, 21, the first rope, 22, heavy object, 3, transmission device, 31, vertical transmission device, 311, winding reel, 3111, small winding groove, 3112, large Winding slot, 312, the second rope, 313, gear bobbin, 314, bull gear, 315, pinion, 316, rear axle, 317, rear wheel, 318, horizontal bevel gear, 32, horizontal transmission device, 321, Vertical bevel gear, 322, the first vertical shaft, 4, steering mechanism, 41, crank rocker mechanism, 411, crank plate, 412, connecting rod, 413, rocking bar, 414, the first changing bolt, 415, the first Two change bolts, 42, incomplete gear set, 421, incomplete gear, 422, complete gear, 423, second vertical shaft, 43, wheel frame, 44, steering wheel, 5, car plate, 6, fixed piece, 7, support fixing groove, 8, first support, 9, second support.

Detailed ways

The principles and features of the present utility model are described below in conjunction with the accompanying drawings, and the examples given are only used to explain the utility model, and are not used to limit the scope of the utility model.

Example

As shown in Figure 1-3, the carbon-free trolley driven by gravitational potential energy around the double 8-shaped track is characterized in that it includes: a frame 1, a power conversion mechanism 2 arranged on the frame 1, and a The transmission device 3 on the vehicle frame 1 and the steering mechanism 4 arranged on the vehicle frame 1, the transmission device 3 includes a vertical transmission device 31 and a horizontal transmission device 32, and the steering mechanism 4 includes: a crank Rod mechanism 41, incomplete gear set 42 and steering wheel 44, the power conversion mechanism 2 is in transmission connection with the vertical transmission device 31, the vertical transmission device 31 is transmission connection with the horizontal transmission device 32, and the horizontal The transmission device 32 is drivingly connected to the incomplete gear set 42, and the incomplete gear set 42 is drivingly connected to the crank rocker mechanism 41, and the crank rocker mechanism is rotatably connected to the steering wheel 44, and the incomplete gear set 42 rotates to drive the crank and rocker mechanism 41 to swing, and the position of the crank and rocker mechanism 41 changes, driving the deflection angle and deflection range of the steering wheel 44 to change.

It can be understood that the vertical transmission device 31 transforms the movement in the vertical plane into the movement in the horizontal plane of the horizontal transmission device 32 .

Further, as shown in Figure 1-2, the power conversion mechanism 2 is provided with a weight block 22, and the weight block 22 is fixedly connected to one end of the first rope 21, and the power conversion mechanism 2 converts the weight The gravitational potential energy of the block 22 is converted into the kinetic energy of the transmission device 3 .

Further, the vertical transmission device 31 includes: a winding reel 311, a second rope 312, a gear winding shaft 313, a large gear 314, a pinion 315, a rear axle 316, a rear wheel 317 and a horizontal bevel gear 318. The winding reel 311 includes: a small winding groove 3111 and a large winding groove 3112, the small winding groove 3111 and the large winding groove 3112 are coaxial, and the other end of the first rope 21 is connected to the small winding groove. Wire slot 3111, one end of the second rope 312 is wound on the large winding slot 3112, the other end of the second rope 312 is connected to the middle part of the gear winding shaft 313, and a large gear 314 is arranged at one end of the gear winding shaft 313, so The large gear 314 meshes with the pinion 315, the pinion 315 is arranged on the rear wheel shaft 316, the rear wheel shaft 316 is connected to the rear wheel 317, and the other end of the gear winding shaft 313 is provided with the horizontal bevel gear 318. Object block 22 descends and drives described winding reel 311 to rotate, and drives described large winding groove 3112 to rotate, and drives described second rope 312, pulls described gear winding shaft 313 to rotate, drives described large gear 314 and described large gear simultaneously. The horizontal bevel gear 318 rotates, and the large gear 314 rotates to drive the small gear 315 to rotate, which drives the rear wheel 317 to rotate. The horizontal bevel gear 318 converts the motion in the vertical plane into the horizontal plane of the horizontal transmission device 32. exercise.

It can be seen that a second support 9 is provided in the middle of the rear axle 316 , and the second support 9 is located at one end of the pinion 315 .

It can be understood that the frame 1 is provided with a rope frame, the winding reel 311 is fixed on the rope frame through a rope frame support, and the rope frame is fixed on the vehicle plate 5 through three rope frame rods. The height of the rope support rod matches the moving distance of the weight 22 and the first rope 21 , and the gap between the three rope support rods matches the size of the weight 22 .

It can be understood that, the middle part of the gear winding shaft 313 is conical.

It can be understood that a groove body is provided on the vehicle board 5, and the large gear 314 passes through the groove body.

Further, the horizontal transmission device 32 includes a vertical bevel gear 321 , the vertical bevel gear 321 meshes with the horizontal bevel gear 318 , and the vertical bevel gear 321 is arranged at one end of the first vertical shaft 322 .

It can be understood that the first vertical shaft 322 is fixed on the vehicle panel 5 through a fixing piece.

Further, the incomplete gear set 42 includes an incomplete gear 421, the incomplete gear 421 is arranged at the other end of the first vertical shaft 322, the incomplete gear 421 meshes with the complete gear 422, and the complete The gear 422 is disposed at one end of the second vertical shaft 423 , and the second vertical shaft 423 is connected to the crank-rocker mechanism 41 .

It can be understood that the first vertical shaft 322 is fixed on the vehicle panel 5 through a fixed piece, the fixed piece is located at the lower end of the vehicle panel 5, the incomplete gear set 42 and the horizontal cone The gear 318 is located at the upper end of the vehicle board 5 .

Further, as shown in FIG. 3 , the crank and rocker mechanism 41 includes a crank plate 411, a connecting rod 412 and a rocker 413, the crank plate 411 is arranged at the other end of the second vertical shaft 423, and the The lower end of the crank plate 411 is rotatably connected to one end of the connecting rod 412 through the first changing pin 414, and a first movable chute is set on the crank plate 411, and the first changing pin 414 is rotatably connected to the first movable chute. , the other end of the connecting rod 412 is rotatably connected to one end of the rocker 413 through the second changing pin 415, and a second movable chute is opened on the connecting rod 412, and the second changing pin 415 is rotatably connected to the The second active chute.

Further, the steering mechanism 4 further includes a wheel frame 43 , the other end of the rocker 413 is fixedly connected to the wheel frame 43 , and the lower end of the wheel frame 43 is connected to the steering wheel 44 . The position of the first changing pin 414 is changed to change the actual working length of the crank plate 411, and the position of the second changing pin 415 is changed to change the actual working length of the connecting rod 413. By changing these two parts Change the deflection angle and deflection range of the steered wheel 44.

It can be understood that the actual working length of the crank plate 411 refers to the length from the first change pin 414 to the center of the crank plate 411, and the actual participating working length of the connecting rod 413 refers to the length of the first change pin 414. The distance between the peg 414 and the second change peg 415 .

Further, the wheel frame 414 is fixedly connected to the vehicle board 5 through the fixing piece 6 .

It can be understood that the fixed piece is located above the vehicle panel 5, and the wheel frame 414 is located at the lower end of the vehicle panel 5.

Further, the left and right ends of the gear winding shaft 313 are fixed on the vehicle panel 5 through the first support 8, and the left and right ends of the rear wheel shaft 316 are fixed on the vehicle panel 5 through the second support 9, A support fixing groove 7 is provided on the vehicle plate 5, and the first support 8 and the second support 9 are fixed inside the support fixing groove 7 by bolts.

Further, the power conversion mechanism 2 , the transmission device 3 and the incomplete gear set 42 are arranged above the vehicle board 5 , and the crank rocker mechanism 41 is arranged below the vehicle board 5 .

Working principle: First, the heavy object 22 falls from the space surrounded by three rope rack rods, and the first rope 21 wrapped in the small winding groove 3111 pulls the winding reel 311 to rotate, and the reel 311 rotates to pull The second rope 312, because the other end of the second rope 312 is wound on the gear winding shaft 313 with a tapered section, so the gear winding shaft 313 starts to rotate, and the fixed large gear 314 on the gear winding shaft 313 starts to rotate, through gear engagement , drive the pinion 315 to move, because the pinion 315 is fixedly connected on the rear axle 316, so just can drive the rear wheel 317 to move, and dolly starts to walk. When the gear winding shaft 313 moves, the horizontally arranged horizontal bevel gear 318 on the gear winding shaft 313 also rotates accordingly, and the vertically arranged vertical bevel gear 321 is driven to move by the gear engagement (this process realizes the The movement is converted into a movement in the horizontal direction). At this time, the first vertical shaft 322 connected to the vertical bevel gear 321 also starts to move, which will drive the incomplete gear 421 on the first vertical shaft 322 to move, and the complete gear 422 will generate intermittently through the gear meshing. sex, regular exercise. And through the second vertical shaft 423, this law of motion is passed to the crank disc 411 at the bottom of the car, after the connecting rod 412 and the crank disc 411 are connected by the first rotatable changing pin 414, (the effect of the pin is to make the crank disc 411 and connecting rod 412 can only do planar movement around the bolt, when the crank disc 411 rotates, drive the connecting rod 412 to do planar movement, this movement is regular, according to the change of the angle that the crank disc 411 turns, and the regular change), The crank plate 411 rotates, driving the connecting rod 412 to move in a plane, and the connecting rod 412 and the rocking bar 413 are also connected through the rotatable second changing pin 415 to push the rocking bar 413. Since the rocking bar 413 and the wheel frame 43 are fixed together, so The steering wheel 44 is made to swing to control the forward direction of the car.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (10)

1. A carbon-free trolley driven by gravitational potential energy around double 8-shaped tracks, characterized in that it comprises: a vehicle frame (1), a power conversion mechanism (2) arranged on the vehicle frame (1), The transmission device (3) arranged on the vehicle frame (1) and the steering mechanism (4) arranged on the vehicle frame (1), the transmission device (3) includes a vertical transmission device (31) and The horizontal transmission device (32), the steering mechanism (4) includes: a crank rocker mechanism (41), an incomplete gear set (42) and a steering wheel (44), the power conversion mechanism (2) and the vertical The straight transmission device (31) is transmission connected, the vertical transmission device (31) is transmission connected to the horizontal transmission device (32), and the horizontal transmission device (32) is transmission connection to the incomplete gear set (42), so The incomplete gear set (42) is transmission connected to the crank rocker mechanism (41), and the crank rocker mechanism (41) is rotatably connected to the steering wheel (44), and the incomplete gear set (42) rotates, The crank and rocker mechanism (41) is driven to swing, the position of the crank and rocker mechanism (41) changes, and the deflection angle and deflection range of the steering wheel (44) are driven to change. 2. The carbon-free trolley driven by gravitational potential energy according to claim 1, characterized in that, the power conversion mechanism (2) comprises a weight block (22) and a first rope (21) , the weight block (22) is fixedly connected to one end of the first rope (21), and the power conversion mechanism (2) converts the gravitational potential energy of the weight block (22) into the transmission device (3 ) kinetic energy. 3. according to claim 2, the carbon-free dolly driven by gravitational potential energy around double 8-shaped tracks is characterized in that, the vertical transmission device (31) comprises: a winding reel (311), a second rope ( 312), gear bobbin shaft (313), bull gear (314), pinion gear (315), rear axle (316), rear wheel (317) and horizontal bevel gear (318), and described reel (311) comprises The small winding groove (3111) and the large winding groove (3112), the small winding groove (3111) and the large winding groove (3112) are coaxial, and the other end of the first rope (21) is connected In the small winding groove (3111), one end of the second rope (312) is wound on the large winding groove (3112), and the other end of the second rope (312) is connected to the gear winding shaft (313) middle part, said gear winding shaft (313) one end is provided with said bull gear (314), and said bull gear (314) engages said pinion gear (315), and said pinion gear (315) is arranged on said On the rear wheel shaft (316), the rear wheel shaft (316) is connected to the rear wheel (317), and the other end of the gear winding shaft (313) is provided with the horizontal bevel gear (318). 4. The carbon-free trolley driven by gravitational potential energy according to claim 3, characterized in that, said horizontal transmission device (32) comprises a vertical bevel gear (321) and a first vertical shaft (322), the vertical bevel gear (321) engages the horizontal bevel gear (318), and the vertical bevel gear (321) is arranged at one end of the first vertical shaft (322). 5. According to claim 4, the carbonless trolley driven by gravitational potential energy around double 8-shaped tracks, characterized in that, said incomplete gear set (42) comprises incomplete gears (421) and complete gears (422) , the incomplete gear (421) is arranged on the other end of the first vertical shaft (322), the incomplete gear (421) meshes with the complete gear (422), and the complete gear (422) is set At one end of the second vertical shaft (423), the second vertical shaft (423) is connected to the crank rocker mechanism (41), and the second vertical shaft (423) rotates to drive the crank rocker mechanism (41). The lever mechanism (41) swings. 6. The carbon-free trolley driven by the gravitational potential energy according to claim 5 is characterized in that, the crank rocker mechanism (41) comprises a crank plate (411), a connecting rod (412) and Rocker (413), the crank plate (411) is arranged at the other end of the second vertical shaft (423), the lower end of the crank plate (411) is connected to the connecting rod through the first changing pin (414) One end of the rod (412), the first movable chute is set on the crank plate (411), the first changing pin (414) is rotatably connected to the first movable chute, and the connecting rod (412) The other end is rotatably connected to one end of the rocking bar (413) through the second changing pin (415), and a second movable chute is opened on the connecting rod (412), and the second changing pin (415) is rotatably connected to the end of the rocking bar (413). Describe the second active chute. 7. According to claim 6, the carbon-free trolley driven by gravitational potential energy and traveling around double 8-shaped tracks is characterized in that, the steering mechanism (4) also includes a wheel frame (43), and the rocker (413) The other end of the wheel frame (43) is fixedly connected to the wheel frame (43), and the lower end of the wheel frame (43) is connected to the steering wheel (44). 8 . The carbonless trolley driven by gravitational potential energy according to claim 7 , wherein the wheel frame ( 43 ) is fixedly connected to the vehicle board ( 5 ) through a fixing piece ( 6 ). 9. According to claim 8, the carbon-free trolley driven by gravitational potential energy and traveling around double 8-shaped tracks is characterized in that, the left and right ends of the gear winding shaft (313) are fixed on the first support (8) On the vehicle plate (5), the left and right ends of the rear axle (316) are fixed on the vehicle plate (5) through the second support (9), and a support is set on the vehicle plate (5) to fix The groove (7), the first support (8) and the second support (9) are fixed inside the support fixing groove (7) by bolts. 10. According to claim 9, the carbon-free trolley driven by gravitational potential energy and traveling around double 8-shaped tracks is characterized in that, the power conversion mechanism (2), the transmission device (3) and the incomplete gear The set (42) is arranged above the vehicle board (5), and the crank rocker mechanism (41) is arranged below the vehicle board (5).