Fifty-gear multi-stage variable transmission mechanism based on differential rotation speed offset

Abstract

A fifty-gear multi-gear transmission mechanism based on differential rotation speed offsetting is characterized in that it comprises a through differential assembly, a seven-gear driving sprocket set, a driven sprocket assembly, a worm and gear reduction box, a speed increasing box and a through half shaft, the driving sprocket set is fixed to the outside of the differential housing, the driven sprocket assembly comprises seven rigid driven sprockets and an empty sprocket, the driven shaft is connected to the worm and gear box and the speed increasing box in sequence, the output end of the speed increasing box is connected to the right half shaft gear, the through half shaft is arranged in the differential, and the single-way overrunning clutch is arranged at the two ends of the half shaft to connect the wheels. The application utilizes the matching of the sprockets to form 49 groups of transmission speed ratios, when the chain engages the empty sprocket, the rear end transmission assembly is stationary, the power directly drives the through half shaft to form an independent extreme speed gear and a reverse gear, and a total of fifty mechanical gears are formed. The application is suitable for fuel vehicles and new energy vehicles which can also run without a clutch after being modified.

Description

[0001] summary

[0002] A 50-speed multi-gear transmission mechanism based on differential speed cancellation is characterized by comprising a through-type differential assembly, a seven-speed drive sprocket assembly, a driven sprocket assembly, a worm gear reducer, a speed increaser, and a through-type half-shaft. The drive sprocket assembly is fixed to the outside of the differential housing. The driven sprocket assembly includes seven rigid driven sprockets and one unloaded sprocket. The driven shaft is sequentially connected to the worm gear reducer and the speed increaser. The output end of the speed increaser is connected to the right half-shaft gear. The through-type half-shaft is located inside the differential, and one-way overrunning clutches are fitted at both ends of the half-shaft to connect to the wheels. This invention utilizes sprocket matching to form 49 transmission ratios. When the chain engages the unloaded sprocket, the rear transmission component is stationary, and the power directly drives the through-type half-shaft to form independent high-speed gears and a reverse gear, totaling fifty mechanical gears. This invention is applicable to fuel vehicles and new energy vehicles modified to operate without a clutch. Technical Field

[0003] This invention belongs to the field of vehicle transmission technology, specifically relating to a novel vehicle transmission mechanism that achieves fifty-level mechanical speed change based on the differential speed cancellation principle, sprocket gradient speed change, worm gear speed increase and idle sprocket locking. Background Technology

[0004] Existing vehicle transmissions are mainly divided into manual transmissions, automatic transmissions, continuously variable transmissions (CVTs), and dual-clutch transmissions. Traditional transmissions typically have between 5 and 10 gears, resulting in low gear density, rough shift transitions, noticeable low-speed jerking, and difficulty in controlling low-speed start-stop.

[0005] Meanwhile, existing transmissions cannot achieve mechanical zero-speed lock-up, and must rely on the clutch and brake to park, resulting in complex structure, high wear and tear, and high energy consumption.

[0006] Conventional transmission structures cannot utilize the differential's own speed differential characteristics to achieve reverse offset speed regulation, nor can they realize multi-level finely gradual gear shifting and independent ultra-high speed direct drive gears in the mechanical structure. High-speed transmission losses are large and extreme speed expansion capabilities are limited.

[0007] Therefore, the market urgently needs a new type of transmission mechanism with a wide range of gears, smooth shifting, built-in zero-speed parking, built-in ultra-high-speed direct drive, reliable structure, and purely mechanical controllability.

[0008] Purpose of the invention

[0009] In response to the shortcomings of existing technologies, such as limited gears, coarse gear shifting, lack of mechanical zero-speed gear, and low high-speed transmission efficiency, this invention provides a 50-speed multi-stage precision transmission mechanism based on the differential speed cancellation principle, achieving full speed range coverage from zero-speed parking, low-speed gradual acceleration, medium- and high-speed fine speed adjustment, to ultra-high-speed direct drive.

[0010] Core innovation of this invention

[0011] (1) Utilizing the principle of offsetting the speed difference between the left and right half shafts of the differential, a mechanical 0-speed parking gear was first created, which can keep the whole vehicle stationary without relying on the brake or clutch.

[0012] (2) A matrix combination of 7 sets of driving sprockets and 7 sets of driven sprockets is adopted to form 49 levels of full-coverage fine mechanical transmission gears.

[0013] (3) It achieves 47 levels of continuous linear gradual acceleration gears, making acceleration extremely smooth and without jerking.

[0014] (4) Add a suspended sprocket structure to realize an independent 50th gear high-speed direct drive mode, with the differential's full power directly connected to the wheels, greatly improving the speed.

[0015] (5) It adopts a through-type integrated half shaft + two-end one-way overrunning clutch structure, which automatically adapts to steering differential and skidding overrunning, resulting in lower energy consumption, longer skidding distance, and the ability to get the vehicle out of trouble when a single wheel is suspended in the air.

[0016] (6) With the worm gear + speed increaser reverse coupling structure, the right half shaft of the differential can be precisely reversed to achieve full-range controllable mechanical speed change.

[0017] Beneficial effects

[0018] (1) The gear density is extremely high, with a total of fifty mechanical gears. The shift gradient is very small, and the vehicle accelerates linearly, smoothly, and without jerking.

[0019] (2) It has a pure mechanical zero-speed lock function, which makes starting smoother and parking more reliable, and greatly reduces the wear of brakes and clutch.

[0020] (3) It has an independent ultra-high speed direct drive gear, and the maximum speed is significantly higher than that of traditional transmissions.

[0021] (4) The half shaft is equipped with a one-way overrunning clutch at both ends, so there is no motor drag resistance when gliding, the gliding distance is greatly increased, the energy saving effect is significant, and the vehicle can get out of trouble when a single wheel is suspended.

[0022] (5) Pure mechanical structure, no dependence on electrical control, low failure rate, long life, high temperature resistance and strong stability.

[0023] (6) The structure is compact and is based on the original vehicle differential. It is suitable for the modification of various electric vehicles, hybrid vehicles and fuel vehicles. Detailed Implementation

[0024] A 50-speed multi-stage transmission mechanism based on differential speed cancellation includes a through differential assembly, a seven-speed drive sprocket set, a driven sprocket assembly, a worm gear reducer, a speed increaser, and a through half-shaft.

[0025] A set of seven-speed drive sprockets extends axially to the right side of the differential housing and is rigidly fixed therein. The number of teeth on the drive sprockets ranges from 14 to 28, and is evenly divided into seven gear shifting teeth.

[0026] The driven sprocket assembly includes seven driven sprockets rigidly fixed to the driven shaft, with the same number of teeth ranging from 14 to 28, achieving a one-to-one correspondence with the driving sprocket.

[0027] At the same time, a 28-tooth idler sprocket is added to the driven shaft. The sprocket is suspended by bearings and has no rigid connection with the driven shaft. It does not transmit torque and can only rotate independently.

[0028] The driven shaft's power input end is connected to a worm gear reducer with a speed ratio of 30:1, and the worm gear reducer's output end is connected to a speed increaser with a speed ratio of 1:30. The speed increaser's output end is rigidly connected to the right half-shaft gear of the differential.

[0029] The differential uses a through-type integral half-shaft structure, with the through half-shaft running through both the left and right sides. One-way overrunning clutches are installed at both ends of the through half-shaft, and the wheel assembly is connected to the outside of the one-way overrunning clutches.

[0030] This invention achieves all fifty gear levels through different sprocket meshing combinations. The specific gear working principle is as follows:

[0031] (1) Zero-speed parking, 0 gear

[0032] When the maximum 28-tooth active sprocket meshes with the minimum 14-tooth driven sprocket, the chain drive forms a 2:1 speed-increasing transmission ratio.

[0033] The differential housing receives rotational power, which is then transmitted to the right half-shaft gear after passing through a sprocket for speed increase, a worm gear for speed reduction, and a speed increaser for secondary speed increase.

[0034] The reverse rotation speed generated by the right half-shaft gear precisely cancels the input speed of the differential housing, causing the speed of the left through half-shaft to return to zero, and the whole vehicle to come to a complete stop, realizing the zero-speed lock parking gear of the mechanical structure, and realizing the operation of the motor vehicle without the need for a clutch. (2) Gradual acceleration gears from 1st to 47th gear.

[0035] Keeping the maximum 28-tooth sprocket of the driving chain fixed, the chain gradually switches from the driven 14-tooth sprocket to the driven 28-tooth sprocket, and the transmission speed increase ratio gradually decreases, so that the vehicle starts smoothly from a standstill and accelerates continuously and linearly.

[0036] After the driven sprocket switches to a maximum of 28 teeth, the number of driven teeth remains fixed, while the driving sprocket switches from 28 teeth to 14 teeth in stages, thus forming a continuous speed variation range again.

[0037] The two consecutive gear shifts create a total of forty-seven orderly, smooth, and seamless gradual driving gears.

[0038] (3) 49-speed matrix-style full-coverage transmission gears

[0039] The seven sets of driving sprockets and the seven sets of driven rigid sprockets can be freely combined in pairs to form 7×7=49 independent, different and unique mechanical transmission speed ratios.

[0040] Forty-nine speed ratios cover all driving conditions, including zero speed, low speed, crawling, medium speed, and high speed, achieving ultra-high density mechanical precision transmission.

[0041] (4) The 50th gear is the ultra-high-speed direct drive gear.

[0042] When the driving minimum 14-tooth sprocket engages with the driven 28-tooth empty sleeve suspension sprocket:

[0043] The chain only drives the idle sprocket to rotate freely, without driving the driven shaft.

[0044] The driven shaft, worm gear housing, and speed-increasing housing are all locked in place.

[0045] When the right half-shaft gear is in a stationary locked state, all the power input to the differential housing is no longer split, but is directly driven through the planetary gears of the differential to output through the half-shaft, forming a fixed-rate high-speed direct drive state and a reverse gear state, which is the 50th gear, the highest speed gear unique to this invention.

[0046] The speed increaser output is rigidly connected to the right half-shaft gear, so the right half-shaft gear is completely stationary.

[0047] One-way overrunning clutches are installed at both ends of the through half-shaft. When the vehicle is driving normally, the transmission of force is locked. When the vehicle is coasting, going downhill, or when the wheel speed exceeds the transmission shaft speed, the one-way overrunning clutches automatically disengage, eliminating reverse drag resistance, greatly extending the coasting distance, reducing energy consumption, and enabling the vehicle to get out of trouble when a single wheel is suspended in the air.

[0048] The outer side of the sprocket assembly is equipped with a chain guide slide and a gear limit structure to ensure that only one sprocket engages during each gear shift, eliminating problems such as chain stacking, jamming, and chain slippage, resulting in precise, stable, and reliable gear shifting. Attached Figure Description

[0049] Figure 1 This is a schematic diagram of the overall structure assembly of the present invention;

[0050] Figure label:

[0051] 1-Differential housing; 2-Drive sprocket assembly; 3-Driven sprocket assembly; 4-Unloaded sprocket; 5-Driven shaft; 6-Worm gearbox; 7-Speed ​​increaser; 8-Right half-shaft gear; 9-Through half-shaft; 10-One-way overrunning clutch; 11-Chain guide rail; 12-Wheel.

Claims

1. A fifty-speed multi-stage transmission mechanism based on differential speed cancellation, characterized in that: It includes a through differential assembly, a seven-speed drive sprocket assembly, a driven sprocket assembly, a worm gear reducer, a speed increaser, and a through half-shaft; The differential housing extends axially and is rigidly fixed to a seven-speed drive sprocket set, with the number of teeth on the drive sprockets ranging from 14 to 28 teeth, for a total of seven speeds. The driven sprocket assembly includes seven driven sprockets rigidly fixed to the driven shaft and one 28-tooth idler sprocket; the idler sprocket is loosely fitted onto the driven shaft via bearings, and has no torque transmission with the driven shaft, allowing it to rotate independently. The driven shaft is sequentially connected to the input end of the worm gear reducer and the input end of the speed increaser, and the output end of the speed increaser is rigidly connected to the right half-shaft gear of the differential. The differential has a through-type half-shaft structure inside, with one-way overrunning clutches installed at both ends of the through-type half-shaft and connected to the wheels; by matching and combining the seven teeth of the driving sprocket with the seven teeth of the driven rigid sprocket in pairs, forty-nine different transmission speed ratios are formed, including zero-speed lock-up gears and forty-seven progressive speed-increasing gears. When the minimum 14-tooth active sprocket meshes with the 28-tooth passive sprocket, the driven shaft, worm gear mechanism, and speed-increasing mechanism are all stationary, the right half-shaft gear is locked and stationary, and the differential power is completely driven through the planetary gear to form a fixed-rate extreme speed output gear. The overall structure combines forty-nine conventional gears with one independent high-speed gear, forming a mechanical fifty-level multi-speed transmission structure.

2. The fifty-speed multi-stage transmission mechanism based on differential speed cancellation according to claim 1, characterized in that: When the driving sprocket with the largest 28 teeth meshes with the driven sprocket with the smallest 14 teeth, a fixed speed-increasing transmission ratio of 2:1 is formed. In this gear position, the reverse rotation speed of the right half-shaft gear cancels out the input speed of the differential housing, and the rotation speed of the left through half-shaft is zero, thus achieving zero-speed parking lock in gear 0.

3. The fifty-speed multi-stage transmission mechanism based on differential speed cancellation according to claim 1, characterized in that: With the active sprocket fixed at 28 teeth, the driven sprocket shifts from 14 teeth to 28 teeth in stages, so that the vehicle speed can be smoothly started from a standstill and continuously increased. With the driven sprocket fixed at 28 teeth, the driving sprocket gradually switches from 28 teeth to 14 teeth, forming a continuous forty-seven-level orderly speed-changing gear.

4. A fifty-speed multi-stage transmission mechanism based on differential speed cancellation according to claim 1, characterized in that: The seven sets of driving sprockets and the seven sets of rigid driven sprockets are perfectly matched in pairs to form a total of 49 independent transmission speed ratios (7×7), covering all normal driving conditions from zero speed to high speed.

5. A fifty-speed multi-stage transmission mechanism based on differential speed cancellation according to claim 1, characterized in that: The 28-tooth sprocket added to the driven side has a bearing sleeve suspension structure, where only the chain rotates with the drive wheel and does not drive the rear shaft and transmission components to rotate. In this meshing state, the worm gear housing and the speed increaser housing remain completely stationary, and the right half-shaft gear is rigidly locked in place.

6. A fifty-speed multi-stage transmission mechanism based on differential speed cancellation according to claim 1, characterized in that: When the right half-shaft gear is locked at rest, all the power input to the differential housing is directly driven through the half-shaft output via the planetary gear, forming a fixed 50th gear high-speed direct drive mode with a speed ratio of twice that of reverse gear and a mode that also takes into account reverse gear.

7. A fifty-speed multi-stage transmission mechanism based on differential speed cancellation according to claim 1, characterized in that: The vehicle's output half-shaft adopts an integrated through-shaft structure, with one-way overrunning clutches installed at both ends of the through-shaft. When the vehicle is driving normally, the one-way overrunning clutch locks and transmits power. When coasting, steering, or when the wheel speed exceeds the limit, it automatically disengages and spins freely. It is suitable for differential steering and inertial coasting conditions. When a single wheel is suspended in the air, it can help the vehicle get out of trouble.

8. A fifty-speed multi-stage transmission mechanism based on differential speed cancellation according to claim 1, characterized in that: The outer side of the sprocket assembly is equipped with a chain guide slide and a gear limit structure to ensure that only one sprocket engages during each gear shift, eliminating problems such as jamming, chain slippage, and interference caused by overlapping of double sprockets, thus achieving smooth and precise gear shifting.

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