WO2012122680A1

WO2012122680A1 - Feedback-type differential automatic stepless transmission

Info

Publication number: WO2012122680A1
Application number: PCT/CN2011/000436
Authority: WO
Inventors: 李明生; 张文丽
Original assignee: Li Mingsheng; Zhang Wenli
Priority date: 2011-03-17
Filing date: 2011-03-17
Publication date: 2012-09-20

Abstract

A feedback-type differential automatic stepless transmission is provided. In the stepless transmission, at first power of an engine is transmitted through two parallel output paths with different speed ratios, each of which is composed of an improved NGW planetary reduction mechanism. Then output power from the two paths is summarized through a special purpose differential (16,17) and afterwards a final speed is output. At last the final output speed is fed back to outer gear rings of the improved NGW planetary reduction mechanisms, so as to automatically regulate the outer gear ring speeds of the two planetary reduction mechanisms through the feedback signal from the output port, and then change an output ratio of one improved NGW planetary reduction mechanism to the other, thus enabling an automatic stepless regulation of the speed ratio. The present invention adopts a pure gear transmission with a wide adjustable range of speed ratio, single stage of which can be up to 9:1-1:1, has a high transmission efficiency which can be over 0.95, and has no limitations for the transmitted power. The invention enables a high load-carrying capacity, a smaller volume, a lighter weight, a simple and reliable structure with a low manufacturing cost, achieves an automatic regulation of the speed ratio according to the output data, thereby being another choice for manufacturing automatic transmissions in automobiles and other construction machineries.

Description

Feedback differential automatic continuously variable transmission

TECHNICAL FIELD - This paper relates to a feedback differential automatic continuously variable transmission for automobiles and other construction machinery, which belongs to the design and manufacture of shifting mechanisms for automobiles and other engineering machinery.

Background technique:

At present, there are three main types of transmissions used in automobiles and other construction machinery, namely, MT manual transmission, CVT automatic transmission, and AT automatic transmission. Among them, the speed ratio change of the MT manual transmission is manually completed, the gear position is limited, the speed ratio between the two gears changes greatly, the gear shift process has a large impact on the mechanism, and the driving comfort is affected; the main function of the CVT automatic transmission The components are realized by static friction, can not achieve high-power transmission, and are easy to damage, and the cost is high; the core component of the AT automatic transmission is the torque converter, and the torque converter successfully realizes the stepless speed change. However, the organization is very complicated, the manufacturing cost is high, and the work efficiency is low.

The invention proposes a novel transmission design concept, applies feedback and differential to the design of the reducer, and proposes a new reducer design idea of multiple input, multi-path and multiple output, so that the pure gear reducer is realized. Automatic shifting is possible. Using the above concepts and ideas, the present invention successfully designs an automatic transmission with low cost, high efficiency, strong carrying capacity, high power transmission, automatic stepless speed ratio adjustment according to output conditions, and design for transmission of automobiles and other engineering machinery. And use to provide more options.

Summary of the invention:

The invention aims to create a pure gear automatic continuously variable transmission with simple and reliable structure, and provides a low cost, high efficiency, strong carrying capacity, high power transmission and automatic stepless speed ratio according to output conditions for automobiles and other engineering machinery. Adjusted automatic transmission.

In order to achieve the above object, an automatic transmission proposed by the present invention includes: A pair of improved NGW planetary reducers;

a dedicated differential;

a pair of feedback gears;

a transition gear;

The improved NGW planetary reducer also has gears on the outside of the ring gear. The pair of reducers are installed in parallel, the installation direction is opposite, and the outer side of the ring gear meshes with the feedback gear. The two reducers are numbered, the first reducer is installed, the sun gear For input, the planet carrier is the output, the second gearbox is reverse mounted, the planet carrier is fixed, the sun gear is output, and the two reducers have two outputs.

The dedicated differential is also made up of a modified NGW planetary reducer that combines the outputs of the two retarders into one output. The output of the first reducer is connected to the sun gear of the differential, and the output of the second reducer is connected to the ring gear of the differential through a transition gear, and the differential is finally output through the carrier.

In order to realize automatic stepless speed change, the present invention feeds the final output speed to the outer ring gear of the first and second speed reducers, that is, the rotation of the output shaft will drive the ring gears of the first and second speed reducers.

All of the above mechanisms consist of ordinary gears and structural components.

DRAWINGS

Figure 1 is a working principle diagram of a feedback differential automatic continuously variable transmission;

Figure 2 is an improved NGW transmission ring gear;

Figure 3 is a working principle diagram of the dedicated differential;

Figure 4 is a schematic diagram of gear transmission of a feedback differential automatic continuously variable transmission;

Detailed ways:

As shown in FIG. 1, the engine 1 inputs energy to the transmission through the sun gear 2 of the first speed reducer 3. When the feedback is zero, the energy is finally output directly through the planet carrier of the differential 5; if the feedback is not Zero, the feedback gears 7 and 12 will drive the outer ring gears of the first transmission 3 and the second transmission 10 to rotate, thereby achieving a stepless adjustment of the speed ratio from input to output. The transmission gear 12 is connected to the first transmission 3 and the second transmission 10, the sun gear 4 of the differential 5 is connected to the first transmission, the outer ring gear of the differential 5 and the sun gear 9 of the second transmission 10 are passed through the transition gear. 8 is connected, the energy of the engine is converted into output kinetic energy by the carrier 6 of the differential 5, and the output is adjusted by the feedback gears 7 and 12 to adjust the energy transmission ratio of the first transmission 3 and the second transmission 10.

The differential method of the present invention is different from the conventional differential. The conventional method of using the differential is: one input, two outputs, and the differential method of the present invention is: two inputs, one output.

The power transmission of the power transmission mechanism of the present invention is divided into three different paths, and the transmission results are completely different. Path 1: 1-2-3-4-5-6, starting stage:

In the initial stage, the output speed is zero, the speed of the feedback gear 12 is zero, that is, there is no feedback, and the ring gear speeds of the first speed changer 3 and the second speed transmission 10 are zero. At this time, the second transmission 10 will not operate, and the input of the engine will be directly output to the sun gear 4 of the dedicated differential 5 through the first transmission 3. Since the second transmission 10 does not operate, its output is also zero, and the input of the other input (tooth ring 7) of the dedicated differential 5 is zero. This path is equivalent to directly decelerating the power of the engine through the two-stage series NGW planetary reducer. This path has the largest speed ratio, so the starting output torque is the largest.

Path 2: 1-2-12-10-9-8-5-6, high speed phase:

As the output speed increases, the rotational speed of the feedback gear 12 also increases, and the ring gear speeds of the first transmission 3 and the second transmission 10 also increase, and the result of the increase in the ring gear speed is: the speed of the first transmission 3 ring gear 8 and the sun The rotational speed of the wheel 2 is reversed, causing the first transmission 3 to have a combined output speed of zero at this stage, i.e., the carrier 13 of the first transmission 3 has a rotational speed of zero. On the contrary, since the carrier of the second transmission 10 is fixed, the increase in the rotational speed of the ring gear 15 of the second transmission 10 will cause the output speed of the second transmission 10 sun gear 9 to increase substantially because the second transmission 10 is input by the ring gear 15, and then Output by the sun gear 9, real It is an accelerated process. The input of the differential sun gear 4 of this path is zero, the power of the engine will be directly reversed by the second transmission 10 via the transition gear 8, and then input by the ring gear 17 of the differential, and finally by the differential The planet carrier 16 outputs. This path has the lowest speed ratio, so the output speed is the largest.

Path 3: Path 1 and path 2 are connected in parallel, and the output ratio of path 1 and path 2 is adjusted by feedback gears 7 and 12 to realize automatic stepless speed regulation. Automatic stepless speed regulation phase:

Path one and path two are actually two extreme stages. The two stages of the transmission one 3 and the transmission two 10 always have one output of zero, and the automatic continuously variable shifting stage is between the above two stages.

After the start, as the output 6 speed increases, the output 4 speed of the transmission 3 decreases, and the output speed of the transmission 20 increases. Since the speed ratio of the transmission 3 and the transmission 20 is different, the speed ratio of the transmission 20 is much smaller. Transmissions 3, both of which implement a differential power transmission, for the two inputs of the dedicated differential 5, the input to the input 4 is reduced, the input to the input 17 is substantially increased, and the increased input speed is much greater than the other The input speed is reduced at the input and the final speed of the dedicated differential 5 will increase.

As shown in Fig. 4, the feedback gears 12 and 7 at this stage feed back the output speed 6 to the ring gear 18 and the ring gear 15, thereby realizing the transmission distribution of the first transmission 3 and the second transmission 10. The more the first transmission 3 is distributed, the larger the speed ratio of the entire mechanism is, and the higher the output torque is. The more the second transmission 10 is distributed, the smaller the speed ratio of the entire mechanism is, and the higher the output speed is. The output condition is determined by the output resistance. When the output resistance is greater than the output torque, the final output speed will decrease, the feedback speed of the feedback gears 12 and 7 will decrease, the speed ratio of the entire mechanism will increase, and the output torque will also Increase, finally achieve the dynamic balance of output resistance and output torque; conversely when the output resistance is less than the output torque, the final output speed will increase, the feedback gears 12 and 7 will increase the speed, the overall mechanism speed ratio will decrease, the output torque It also decreases accordingly, and finally the dynamic balance of output resistance and output torque is achieved. Both of the above processes are processes of automatic stepless adjustment and balancing determined by output feedback.

Claims

WO 2012/122680 权禾 ij request PCT/CN2011/000436

1. The feedback automatic differential continuously variable transmission will input and output with two transmission paths with different speed ratios, and then through the special differential, the output of the two paths will be summarized and output, and then the final output speed signal will be output. Feedback to the two transmission paths to achieve automatic adjustment of the energy transfer ratio of the two transmission paths. Finally, the automatic differential infinitely variable speed function is realized.

2. The transmission path of claim 1 employs an improved NGW planetary reducer having teeth on the inside and outside of the ring gear of the planetary reducer to create conditions for the feedback signal to be input from the ring gear.

3. The dedicated differential of claim 1 also employs the improved NGW planetary reducer, which combines the outputs of the two paths into one output, ie, the two paths are respectively from the dedicated differential. The outer gear input of the sun gear and the ring gear is finally output from the planet carrier of the dedicated differential.

4. The output feedback scheme according to claim 1, wherein the final output of the differential is simultaneously fed back to the outer ring gear of the two parallel planetary reducers, and the output speed feedback signal is used to control the rotational speed of the two ring gears. Realize the conditions for automatic differential stepless speed regulation.

5. The two parallel paths according to claim 1, the two planetary reducers connected in parallel are reverse mounted, the forward mounted planetary reducer has a deceleration function, and the reverse mounted planetary reducer has an acceleration function, through feedback The signal controls the ring gear speed of the two reducers, and the energy transmission ratio of the two reducers is automatically adjusted to realize differential infinitely variable speed.