CN111219467A

CN111219467A - Overrunning stepless speed change system

Info

Publication number: CN111219467A
Application number: CN202010233175.2A
Authority: CN
Inventors: 张亚宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-29
Filing date: 2020-03-29
Publication date: 2020-06-02

Abstract

The invention relates to an overrunning type stepless speed change system, which comprises a shell, a planetary gear speed change mechanism, a mechanical stepless speed change mechanism, a reversing mechanism, a first power shaft and a second power shaft, wherein the planetary gear speed change mechanism comprises a sun gear, a gear ring, a planet gear and a planet carrier, the mechanical stepless speed change mechanism comprises a driving wheel and a driven wheel, and is characterized in that the first power shaft is directly or indirectly connected with the sun gear, one element of the planet carrier and the gear ring is directly or indirectly connected with the driving wheel, the other element of the planet carrier and the gear ring is connected with the reversing mechanism, and the reversing mechanism and the driven wheel are directly or indirectly connected with the second power shaft. Therefore, the speed change range of the whole speed change system is improved in a large range, and the device has wide market application prospect.

Description

Overrunning stepless speed change system

Technical Field

The invention belongs to the technical field of mechanical transmission, and particularly relates to an overrunning type stepless speed change system.

Background

Planetary gear transmissions have many unique advantages over conventional gear transmissions. The most remarkable characteristic is that power splitting can be carried out when power is transmitted, and the input shaft and the output shaft are on the same horizontal line. Planetary gear transmissions have been widely used in reduction, speed-increasing and speed-changing devices in various mechanical transmission systems. Particularly, it has found a great deal of application in aircraft and vehicles (particularly heavy vehicles) because of its "high load, high gear ratio" feature. Planetary gears also play a significant role in the torque transmission of the engine. Since the characteristics of the engine such as the rotational speed and torque are greatly different from the road surface traveling demand, the power of the engine is appropriately distributed to the drive wheels, and the conversion can be performed by using the above characteristics of the planetary gear. Automatic transmissions in automobiles also utilize these characteristics of planetary gears to achieve different gear ratios by changing the relative motion relationships of various members through clutches and brakes.

The stepless speed change technology adopts the transmission belt and the driving wheel and the driven wheel with variable working diameters to match and transmit power, and can realize the continuous change of the transmission ratio, thereby obtaining the optimal matching of a transmission system and the working condition of an engine. The stepless speed change automobile is the main trend of the current automobile development, and the automobile models adopting the stepless speed change technology in the domestic market are more and more. Although the stepless speed changing box has the advantages of comfort, high efficiency, energy saving and the like, the current general stepless speed changing box cannot bear larger torsion, or is compensated by higher oil consumption.

In order to reduce oil consumption and improve the working efficiency of the engine, in recent years, researches have been continuously made on how to achieve the purpose of expanding the stepless speed change range of the engine by combining the planetary gear transmission and the stepless speed change technology according to the respective characteristics and advantages of the planetary gear transmission and the stepless speed change technology. According to the working principle of planetary gear transmission, the transmission combination has a plurality of modes, wherein the patent number 201821578844.4 granted by 2019, 7, 5 and 5 of Yangzhou university and named as 'a planetary transmission continuously variable transmission' describes a planetary transmission continuously variable transmission, which combines a continuously variable transmission mechanism, a speed change mechanism and a planetary transmission mechanism, wherein an internal gear is in variable-speed rotation driving, a central sun gear is in constant-speed driving, a second planet carrier serves as an output member, and the rotating speed of the second planet carrier is variable. In the technical scheme, in view of the transmission characteristics of the stepless transmission mechanism, the output shaft is decelerated when the input shaft is accelerated, and the output shaft is accelerated when the input shaft is decelerated, so that the sun gear connected with the input shaft and the internal gear which is indirectly connected with the output shaft subjected to speed change through the speed change mechanism, namely the gear ring do opposite motions. The stepless transmission mechanism and the speed change mechanism do not play a positive role in expanding the speed change range in the whole speed changer, and the whole speed change range is extremely limited. Therefore, how to organically combine the stepless speed change mechanism and the planetary transmission mechanism through a specific connection relationship, and the problem that the prior art needs to solve is to fully utilize the advantages of the stepless speed change mechanism and the planetary transmission mechanism to realize the purpose of expanding the speed change range of the whole speed change system.

Disclosure of Invention

In order to solve the problems in the prior art, the invention aims to provide an overrunning type stepless speed change system which is reasonable in structural design and can change speed in a large range, and the specific technical scheme is as follows:

the utility model provides an surpass formula infinitely variable speed system, contains casing, planetary gear speed change mechanism, mechanical type infinitely variable speed mechanism, reversing mechanism, first power axle and second power axle, planetary gear speed change mechanism contains sun gear, ring gear, planet wheel, planet carrier, mechanical type infinitely variable speed mechanism contains the action wheel, follows the driving wheel, its characterized in that, first power axle direct or indirect with the sun gear links to each other, one of them component of planet carrier and ring gear direct or indirect with the action wheel links to each other, another component of planet carrier and ring gear with reversing mechanism links to each other, reversing mechanism with follow driving wheel and all link to each other with the second power axle directly or indirectly.

Preferably, one of the first power shaft and the second power shaft is an input shaft, and the other is an output shaft. Namely, any end of the first power shaft and any end of the second power shaft can be used as input ends to realize different speed changing purposes.

Further, the planetary gear speed change mechanism belongs to a 2K-H transmission type according to the basic component classification, and specifically, all planetary gear transmission structures which simultaneously comprise a sun gear, a ring gear, a planet gear and a planet carrier in the 2K-H transmission type can be used as the planetary gear speed change mechanism of the invention.

Preferably, the reversing mechanism may be implemented by a gear transmission or a belt transmission or a planetary gear transmission, such as an idler connection, a belt transmission connection, a planetary gear connection, etc., one of which functions is to adjust the rotation direction of the gear ring or the planet carrier connected with the reversing mechanism, ensure that the rotation direction of the gear ring or the planet carrier connected with the reversing mechanism is the same as the rotation direction of the planet carrier or the gear ring connected with the driving wheel, and the other function is to adjust the speed of the gear ring or the planet carrier connected with the reversing mechanism to be not more than the rotation speed of the driven wheel, so as to implement the wide-range speed change of the mechanical continuously variable transmission.

When the clutch is applied to an automobile as a gearbox, the forward gear of the automobile can be realized by controlling the combination of the first clutch and the separation of the second clutch, the reverse gear of the automobile can be realized by controlling the combination of the first clutch and the separation of the second clutch, and the neutral gear is realized by controlling the separation of the first clutch and the second clutch.

Compared with the prior art, the overrunning type stepless speed change system has the following advantages and effects:

1. the product of the invention has reasonable structural design, fully exerts the speed change advantages of the mechanical stepless speed change mechanism and the planetary gear speed change mechanism by organically connecting three elements of the two mechanisms together, realizes the superposition of speed change functions, and further improves the speed change range of the whole speed change system in a large range.

2. The method is applied to the field of automobiles, and can greatly improve the fuel economy while realizing the stepless speed change.

3. The automobile has the advantages of few parts, small volume and no occupation of excessive space, and can be directly applied to the existing automobile.

4. The reasonable proportion can be adjusted to reduce the speed change range of the internal mechanical stepless speed changer, thereby improving the transmission efficiency.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the characterizing parameters mentioned in the embodiments are shown in the following drawings, and it is obvious that the drawings described below are only some embodiments of the present invention.

Fig. 1 is a schematic perspective view of a first embodiment 1 of the present invention;

FIG. 2 is a schematic perspective view of example 1 of the present invention;

FIG. 3 is a front view of embodiment 1 of the present invention;

FIG. 4 is a schematic structural view of example 2 of the present invention;

FIG. 5 is a schematic structural view of example 3 of the present invention;

FIG. 6 is a schematic structural view of example 4 of the present invention;

FIG. 7 is a schematic structural view of example 5 of the present invention.

Description of reference numerals:

1-a planetary gear change mechanism; 2-a mechanical stepless speed change mechanism; 3-a reversing mechanism; 4-a first power shaft; 5-a second power shaft; 6-a first clutch; 7-a second clutch; 11-sun gear; 12-a gear ring; 13-a planet carrier; 21-a driving wheel; 22-a driven wheel; 31-reversing gear (set) or drive belt.

Detailed Description

The present invention will be described in further detail with reference to examples, which are illustrative of the present invention and are not to be construed as being limited thereto. Materials or equipment involved in each example are all conventional materials or equipment on the market if not specifically stated, and detection methods involved are all conventional methods if not specifically stated.

Example 1: as shown in fig. 1 to 3, an overrunning type stepless speed change system includes a housing, an NGW type planetary gear speed change mechanism, a mechanical stepless speed change mechanism, a reversing gear set, an input shaft, and an output shaft, where the NGW type planetary gear speed change mechanism includes a sun gear, a ring gear, a planet gear, and a planet carrier, the mechanical stepless speed change mechanism includes a driving wheel and a driven wheel, the input shaft is directly connected with the sun gear, the planet carrier is directly connected with the driving wheel, the ring gear is connected with the reversing gear (set), and both the reversing gear (set) and the driven wheel are directly connected with the output shaft.

Example 2: as shown in fig. 4, the present embodiment is different from embodiment 1 in that a reversing gear (group) is replaced with a transmission belt.

Example 3: as shown in fig. 5, this embodiment is different from embodiment 1 in that a first clutch is provided between the output shaft and the driven wheel, and a second clutch is provided between the driven wheel and the housing (not shown).

Example 4: as shown in fig. 6, the present embodiment is different from embodiment 3 in that the NGW type planetary gear shifting mechanism is replaced with a two-stage NGW type planetary gear.

Example 5: as shown in fig. 7, this embodiment is different from embodiment 1 in that the mechanical continuously variable transmission is a steel ball outer cone gear type, the reversing gear (group) is replaced by a reversing NGW type planetary gear, and the ring gear is directly connected to a driving wheel (disk) of the steel ball outer cone gear type, the carrier is directly used as a carrier of the reversing NGW type planetary gear, the ring gear of the reversing NGW type planetary gear is fixed, the reversing is completed by a sun gear thereof, and a sun gear of the reversing NGW type planetary gear is connected to the output shaft.

Further, it should be noted that, although equivalents and simple modifications of the principles described in the present patent application are included in the scope of the present patent application, those skilled in the art may make various modifications, additions and substitutions to the described embodiments without departing from the structures of the present invention or exceeding the scope defined by the claims.

Claims

1. The utility model provides an surpass formula infinitely variable speed system, contains casing, planetary gear speed change mechanism, mechanical type infinitely variable speed mechanism, reversing mechanism, first power axle and second power axle, planetary gear speed change mechanism contains sun gear, ring gear, planet wheel, planet carrier, mechanical type infinitely variable speed mechanism contains the action wheel, follows the driving wheel, its characterized in that, first power axle direct or indirect with the sun gear links to each other, one of them component of planet carrier and ring gear direct or indirect with the action wheel links to each other, another component of planet carrier and ring gear with reversing mechanism links to each other, reversing mechanism with follow driving wheel and all link to each other with the second power axle directly or indirectly.

2. The overrunning continuously variable transmission system of claim 1 wherein one of the first and second power shafts is an input shaft and one is an output shaft.

3. The overrunning continuously variable transmission system of claim 1 wherein the planetary gear shifting mechanism is of the 2K-H transmission type by basic component classification.

4. The overrunning continuously variable transmission system of claim 1 wherein the reversing mechanism may be implemented by a gear drive or a belt drive or a planetary gear drive.

5. The overrunning type continuously variable transmission system according to any one of claims 1 to 4, wherein a first clutch is arranged between the second power shaft and the driven wheel, and a second clutch is arranged between the driven wheel and the housing.