CN104595432A - Stepless speed regulation gear reversing transmission structure - Google Patents

Abstract

The invention discloses a stepless speed regulation gear reversing transmission structure. The stepless speed regulation gear reversing transmission structure comprises a belt type stepless transmission, a single-row planetary gear mechanism, an input shaft and output shafts. The single-row planetary gear mechanism comprises a planet carrier, gear rings, a sun wheel and planet wheels. The belt type stepless transmission comprises a driving disc and a driven disc. The stepless speed regulation gear reversing transmission structure further comprises idle wheels, a driving gear and a driven gear, the idle wheels are meshed with the driving gear and the driven gear respectively, the driven gear is connected with the sun wheel, the planet carrier is connected with the driven disc of the belt type stepless transmission, the gear rings are connected with the output shafts, and the driving gear and the driving disc of the belt type stepless transmission are installed on the input shaft. Changes of the large-amplitude transmission ratio of the transmission are obtained through small-amplitude control over changes of the transmission ratio of the belt type stepless transmission, the rotation speed of an engine is low when an automobile runs at a high speed, and economical efficiency is improved; besides, a gear reversing mechanism does not need to be arranged separately, and the manufacturing and control difficulty of a control mechanism is lowered.

Description

Stepless speed regulation and reverse transmission structure

technical field

The invention relates to the technical field of variable speed transmission devices for automobiles, in particular to a stepless speed regulation reverse gear transmission structure.

Background technique

The currently used automotive continuously variable transmission is generally in the form of single-stage transmission. The transmission belt is used to cooperate with the driving and driven wheels with variable working diameters to transmit power, which can realize the continuous change of the transmission ratio. The common continuously variable transmissions include belt type and Metal belt type two type belt type continuously variable transmission. The single-stage transmission form makes the value of the total transmission ratio of the continuously variable transmission smaller. For example, the value of the total transmission ratio of the single-stage continuously variable transmission used in automobiles is less than 6, so that the engine speed is high when the vehicle is running at high speed, and the economy poor. In addition, the current general continuously variable transmission needs to be specially equipped with a reverse gear and a reverse control device, which increases the difficulty of manufacturing and controlling the control mechanism, and increases the cost and failure rate of the transmission.

Contents of the invention

The technical problem to be solved by the present invention is to provide a stepless speed regulation reverse gear transmission structure with a completely new structure. Insufficiency of existing technology.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: stepless speed regulation and reverse gear transmission structure, comprising a belt-type continuously variable transmission, a single-row planetary gear mechanism, an input shaft, and an output shaft, and the single-row planetary gear mechanism includes Planetary carrier, ring gear, sun gear, planetary gear, described belt-type continuously variable transmission comprises driving disc and driven disc, also comprises idler gear, driving gear, driven gear, described idler gear and driving gear, driven gear respectively The gears mesh, the driven gear is connected with the sun gear, the planet carrier is connected with the driven disc of the belt type continuously variable transmission, the ring gear is connected with the output shaft, and the driving gear is installed with the driving disc of the belt type continuously variable transmission on the input shaft.

The driven disc of the belt type continuously variable transmission is installed on the second shaft, and the second shaft is connected with the planet carrier.

Compared with the prior art, the present invention has the following advantages:

The present invention is on the basis of the existing ordinary continuously variable transmission, by adding a single row planetary gear mechanism and driving and driven gears, so as to control the transmission ratio change of the belt type continuously variable transmission in a small range to obtain a large range of transmission transmission. The value of the total transmission ratio of the transmission is far greater than that of the existing continuously variable transmission, and the value of the total transmission ratio of the transmission exceeds 10. In theory, the value of the total transmission ratio of the transmission that can be realized is infinite, making the car high-speed The engine speed is lower when driving, and the economy is improved. In addition, the transmission does not need a separate reverse gear mechanism, which makes the structure of the transmission more compact, reduces the difficulty of manufacturing and controlling the control mechanism, and at the same time reduces the cost and failure rate of the transmission.

Description of drawings

Fig. 1 is a schematic structural diagram of the power transmission mechanism of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1, the continuously variable speed and reverse gear transmission structure of the present invention adopts a combination of a belt type continuously variable transmission and a planetary gear mechanism to transmit power. 9. Planet carrier 14 and ring gear 8), input shaft 5, driving gear 4, idler gear 6, driven gear 13, second shaft 15 and output shaft 11. The belt type continuously variable transmission includes a driving plate and a driven plate, the driving plate includes the active fixed plate 1, the active movable plate 3, the driven plate includes the driven fixed plate 16, the driven movable plate 17, the driving plate and the driven plate The V-belt 2 is used to connect and transmit power, so that a small range of transmission ratio changes can be realized. The stepless speed regulation reverse transmission structure also includes an idler gear, a driving gear, and a driven gear. The idler gear 6 is installed on the idler shaft 7 and meshes with the driving gear 4 and the driven gear 13 respectively. The driven gear is connected with the sun gear, the planet carrier is connected with the driven disk of the belt type continuously variable transmission, the ring gear is connected with the output shaft 11, and the driving gear and the driving disk of the belt type continuously variable transmission are installed on the input on axis. The power is externally output by the output shaft 11.

The active fixed disk 1, the active movable disk 3 and the driving gear 4 are installed on the input shaft 5, and the driven fixed disk 16 and the driven movable disk 17 are on the second shaft 15, and are connected with the planet carrier 10 through the second shaft 15 . The active movable disc 3 and the driven movable disc 17 can move left and right through the control mechanism, thereby changing the transmission ratio of the belt type continuously variable transmission 18. When the active movable disc 3 moves to the left and the driven movable disc 17 moves to the right , The belt type continuously variable transmission 18 transmission ratios reduce, and when the active movable disc 3 moves to the right and the driven movable disc 17 moves left, the belt type continuously variable transmission 18 transmission ratios then increase.

The transmission ratio of the embodiment The characteristics of the transmission ratio between the driven gear 14 and the driving gear 4 , The ratio of the number of teeth of the ring gear 8 of the single row planetary gear mechanism 13 to the number of teeth of the sun gear 11 Relevant, the transmission ratio is derived by deriving The formula is as follows:

=a/[(1+a)/ -1/ ]

- transmission ratio;

a—the ratio of the number of teeth of the ring gear 8 of the single row planetary gear mechanism 13 to the number of teeth of the sun gear 11;

—Belt type continuously variable transmission 18 transmission ratio;

- The transmission ratio between the driven gear 14 and the driving gear 4 .

Suppose the transmission ratio between the driven gear 14 and the driving gear 4 is =0.5, the ratio of the number of teeth of the ring gear 8 of the planetary gear mechanism 12 to the number of teeth of the sun gear 11 =2, the transmission ratio for:

=2/(3/ -2)

The transmission ratio of the embodiment Numerical and belt type continuously variable transmission 18 transmission ratio The corresponding relationship is shown in Table 1.

Table 1 The transmission ratio i value of the transmission and the transmission ratio i of the belt type continuously variable transmission ^t Correspondence 0.7 0.85 1 1.2 1.35 1.5 1.7 0.88 1.31 2 4 9 ∞ -8.5

It can be seen from Table 1 that the transmission ratio of the belt type continuously variable transmission 18 The continuous change range from 0.7 to 1.35 is less than 2 times, while the transmission ratio Then it changes continuously from 0.88 to 9, and the value of the total transmission ratio is more than 10 times, thereby achieving a large change in the transmission ratio of the transmission by controlling the transmission ratio change of the belt type continuously variable transmission 18 in a small range. The total transmission ratio that can be realized in theory is The transmission ratio value is infinite. In addition, when the transmission ratio of the belt-type continuously variable transmission 18 is greater than 1.5, the rotation direction of the output shaft 11 is changed to realize the reverse gear, and no reverse gear mechanism is required separately.

Claims (2)

1. Stepless speed regulation and reverse gear transmission structure, including a belt type continuously variable transmission, a single-row planetary gear mechanism, an input shaft, and an output shaft. The single-row planetary gear mechanism includes a planet carrier, a ring gear, a sun gear, and a planetary gear, The belt-type continuously variable transmission includes a driving disc and a driven disc, and is characterized in that it also includes an idler gear, a driving gear and a driven gear, the idler gear meshes with the driving gear and the driven gear respectively, and the driven gear and the sun The wheels are connected together, the planet carrier is connected with the driven disk of the belt type continuously variable transmission, the ring gear is connected with the output shaft, and the driving gear and the driving disk of the belt type continuously variable transmission are installed on the input shaft. 2. The continuously variable speed reverse transmission structure according to claim 1, characterized in that: the driven plate of the belt type continuously variable transmission is installed on the second shaft, and the second shaft is connected with the planetary carrier.