阅读说明：本技术 一种机械式无级变速器 (Mechanical stepless speed changer ) 是由 赵良红 于 2020-08-18 设计创作，主要内容包括：本发明公开一种机械式无级变速器,包括输入轴及其上的主动定盘,输出轴及其上的从动定盘,相对定盘移动的主动动盘和从动动盘,传动带设置在由定盘、动盘的端面形成的V形槽上,其特征在于：还包括保持架和传动带的张紧装置,主动定盘、动盘以及从动定盘、动盘设置在保持架内框里,保持架通过推力轴承分别与位于保持架内框左右两侧的主动动盘、从动动盘连接,保持架由变速控制机构驱动沿主动定盘的轴线方向左右移动。本发明的V型槽与传动带之间的压紧力更加可靠,因此不会打滑,同时可以采用较大的压紧力,可传递更大的扭矩,无需限制发动机扭矩输出,且变速响应快,可完全发挥汽车加速性能,省去了复杂的油压控制系统,降低了变速器的制造难度及成本,提高了汽车的燃油效率。(The invention discloses a mechanical stepless speed changer, which comprises an input shaft, a driving fixed disc, an output shaft, a driven fixed disc, a driving movable disc and a driven movable disc, wherein the driving fixed disc is arranged on the input shaft, the driven fixed disc is arranged on the output shaft, the driving movable disc and the driven movable disc move relative to the fixed disc, and a transmission belt is arranged on a V-shaped groove formed by the end surfaces of the fixed disc and the movable disc, and the mechanical stepless: the tension device comprises a retainer and a transmission belt, wherein the retainer is connected with a driving fixed disc and a driven fixed disc which are positioned on the left side and the right side of the inner frame of the retainer through thrust bearings, and the retainer is driven by a variable speed control mechanism to move left and right along the axis direction of the driving fixed disc. The pressing force between the V-shaped groove and the transmission belt is more reliable, so the V-shaped groove and the transmission belt cannot slip, meanwhile, larger pressing force can be adopted, larger torque can be transmitted, the torque output of an engine is not limited, the speed change response is fast, the acceleration performance of an automobile can be fully exerted, a complex oil pressure control system is omitted, the manufacturing difficulty and the cost of a transmission are reduced, and the fuel efficiency of the automobile is improved.)

1. The utility model provides a mechanical type continuously variable transmission, includes input shaft and the initiative price fixing on it, output shaft and the driven price fixing on it, the initiative driving disk and the driven driving disk that the relative price fixing removed, the drive belt sets up on the V-arrangement groove that is formed by the terminal surface of price fixing, driving disk, its characterized in that: the tension device comprises a retainer and a transmission belt, wherein the retainer is connected with a driving fixed disc and a driven fixed disc which are positioned on the left side and the right side of the inner frame of the retainer through thrust bearings, and the retainer is driven by a variable speed control mechanism to move left and right along the axis direction of the driving fixed disc.

2. The mechanical continuously variable transmission of claim 1, wherein: the driving movable disc is arranged on the input shaft through a spline, and the driven movable disc is arranged on the output shaft through a spline.

3. The mechanical continuously variable transmission of claim 2, wherein: the tensioning device comprises a tensioning mechanism, a tensioning wheel and a support frame, wherein the tensioning wheel is arranged on the support frame, and the tensioning mechanism is used for driving the tensioning wheel to enable the tensioning wheel to be tightly pressed on the transmission belt.

4. The mechanical continuously variable transmission of claim 3, wherein: the holder is mounted on the guide bar and moves axially along the guide bar.

5. The mechanical continuously variable transmission of claim 3, wherein: the tension force of the tensioning device is adjustable.

6. The mechanical continuously variable transmission of claim 3, wherein: the tensioning device is arranged on one side or the left side and the right side of the transmission belt.

Technical Field

The invention relates to the technical field of transmissions, in particular to a mechanical stepless transmission.

Background

The stepless speed variator is a speed variator applied to automobile transmission system, and has the characteristics of simple structure, small volume, light weight, higher transmission efficiency and low manufacturing cost, and has wider application in automobiles.

The stepless speed changer utilizes the friction force between the V-shaped groove and the transmission belt to realize power transmission, and the currently applied stepless speed changer adopts a hydraulic mode to generate pressing force between the V-shaped groove and the transmission belt, and simultaneously changes the transmission ratio by adjusting hydraulic oil.

However, the conventional continuously variable transmission has the following disadvantages: (1) the V-shaped groove and the transmission belt are easy to slip, and the V-shaped groove and the transmission belt are easy to slip due to the fact that the requirement on oil pressure control accuracy of the continuously variable transmission is high, faults occur easily, pressing force is insufficient, and the V-shaped groove and the transmission belt slip, which is a common fault of the continuously variable transmission and is the most fatal problem. (2) The transmission torque is small and is limited by the maximum oil pressure of the continuously variable transmission system, and the transmission torque is generally small. (3) The speed change is delayed, because the oil pressure building time of the stepless speed changer is slow, the pressing force generated between the V-shaped groove and the transmission belt can not be increased in time, the torque output of an engine can be limited in the acceleration process of the automobile, the situation that the torque of the engine is accelerated too fast to avoid the slippage of the stepless speed changer is avoided, and as a result, the acceleration performance of the automobile is poor, the automobile is not suitable for violent driving, and the driving pleasure is insufficient. (4) The hydraulic control system is complex, difficult to manufacture and high in cost.

Disclosure of Invention

The invention provides a mechanical stepless speed changer with a brand new structure, wherein a tension pulley is used for providing pressing force between a V-shaped groove of the stepless speed changer and a transmission belt, a speed change control mechanism is used for realizing the change of transmission ratio, the transmission ratio is not slipped when power is transmitted, the reliability is high, the transmission torque is large, the speed change response is quick, the mechanical stepless speed changer is suitable for a large-torque engine, the structure is compact, and the defects of the traditional stepless speed changer are overcome.

The technical scheme of the invention is as follows: the utility model provides a mechanical type continuously variable transmission, includes input shaft and the initiative price fixing on it, output shaft and the driven price fixing on it, the initiative driving disk and the driven driving disk that the relative price fixing removed, the drive belt sets up on the V-arrangement groove that is formed by the terminal surface of price fixing, driving disk, its characterized in that: the tension device comprises a retainer and a transmission belt, wherein the retainer is connected with a driving fixed disc and a driven fixed disc which are positioned on the left side and the right side of the inner frame of the retainer through thrust bearings, and the retainer is driven by a variable speed control mechanism to move left and right along the axis direction of the driving fixed disc.

The driving movable disc is arranged on the input shaft through a spline, and the driven movable disc is arranged on the output shaft through a spline.

The tensioning device comprises a tensioning mechanism, a tensioning wheel and a support frame, wherein the tensioning wheel is arranged on the support frame, and the tensioning mechanism is used for driving the tensioning wheel to enable the tensioning wheel to be tightly pressed on the transmission belt.

The holder is mounted on the guide bar and moves axially along the guide bar.

The tension force of the tensioning device is adjustable.

The tensioning device is arranged on one side or the left side and the right side of the transmission belt.

Compared with the prior art, various defects of the traditional continuously variable transmission adopting hydraulic control are overcome, and the method comprises the following steps: the pressing force between the V-shaped groove and the transmission belt is more reliable, so that the V-shaped groove and the transmission belt cannot slip, meanwhile, larger pressing force can be adopted, larger torque can be transmitted, the torque output of an engine is not limited, the speed change response is fast, the acceleration performance of the automobile can be fully exerted, a complex oil pressure control system is omitted, the manufacturing difficulty and the cost of the transmission are reduced, and the fuel efficiency of the automobile is improved.

Drawings

FIG. 1 is a general block diagram of an embodiment of a mechanical continuously variable transmission of the present invention

FIG. 2 is a front end view of an input shaft of an embodiment of the mechanically variable transmission of the present invention.

Fig. 3 is a front end sectional view of an input shaft of an embodiment of the mechanical continuously variable transmission of the present invention.

Fig. 4 is a developed view (partially in section) of the mechanical continuously variable transmission of the present invention.

FIG. 5 is a schematic diagram of the mechanical stepless speed changer with the transmission ratio decreasing from large to small.

FIG. 6 is a layout view of tension pulleys arranged on both sides of the transmission belt of the mechanical continuously variable transmission according to the present invention.

Detailed Description

The invention provides pressing force between the V-shaped groove of the continuously variable transmission and the transmission belt by using the tension wheel, and realizes the adjustment of the pressing force between the V-shaped groove and the transmission belt by adjusting the tension force of the transmission belt by using the tension mechanism. The axial movement of the retainer is controlled by the speed change control mechanism to realize the change of the transmission ratio of the speed changer.

The technical scheme of the invention is further explained by combining the drawings and the specific embodiments in the specification:

the mechanical continuously variable transmission is composed of an input shaft 11, a guide rod 12, a retainer 13, a driving movable disk 14, a driving fixed disk 15, a driven movable disk 20, a driven fixed disk 21, a transmission belt 16, a tensioning mechanism 17, a tensioning wheel 18, a speed change control mechanism 24, a speed change control rod 23, an output shaft 22 and the like, and is shown in fig. 1, 2, 3 and 4.

The driving fixed disc 15 is fixed on the input shaft 11, the driving movable disc 14 is mounted on the input shaft 11 through a spline and can move axially, and a driving V-shaped groove is formed between the driving fixed disc 15 and the driving movable disc 14 after the driving fixed disc and the driving movable disc are assembled.

The driven fixed disc 21 is fixed on the output shaft 22, the driven movable disc 20 is mounted on the output shaft 22 through a spline and can move axially, and a driven V-shaped groove is formed between the assembled driven fixed disc 21 and the assembled driven movable disc 20.

The drive belt 16 is mounted between the driving V-groove and the driven V-groove.

Four opposite corners of the holder 13 are mounted on four guide rods 12 to be movable in the axial direction along the guide rods 12, and the guide rods 12 are parallel to the input shaft 11 and the output shaft 22. On the side close to the input shaft 11, the cage 13 is in contact with the driving disk 14 via a thrust bearing 25. On the side close to the output shaft 22, the cage 13 is in contact with the driven disk 20 via a thrust bearing 19.

One end of the shift control lever 23 is mounted to the cage 13. The shift control mechanism 24 is matched with the shift control lever 23, and the shift control mechanism 24 can drive the shift control lever 23 and the retainer 13 to move left and right to change the transmission ratio of the continuously variable transmission, as shown in fig. 5, the transmission ratio is changed from large to small.

The tension mechanism 17 drives the tension pulley 18 through the holder 31 and the shaft 30, the tension pulley 18 presses the belt 16, and the belt 16 generates a tension force to generate a pressing force between the V-shaped groove and the belt. The tensioning mechanism 17 can adjust the tension generated by the belt 16 to adjust the compression between the V-groove and the belt.

For reliable tensioning, a tensioning mechanism, a tensioning wheel, may be provided on both sides of the belt 16, as shown in fig. 6.

Analyzing the working process:

1. power transmission process

The mechanical continuously variable transmission utilizes a tension pulley to provide a pressing force between the V-shaped groove of the continuously variable transmission and the transmission belt.

As shown in fig. 1 and 4, the holder 13 is a single body, four corners of the holder 13 can move axially on the guide rods 12, and the guide rods 12 are parallel to the input shaft 11 and the output shaft 22, so that the holder 13 keeps a constant distance between the driving disc and the driven disc.

As shown in fig. 3, when the tension mechanism 17 drives the tension pulley 18 through the holder 31 and the shaft 30, the tension pulley 18 presses the belt 16, and the belt 16 generates a tension force, thereby generating pressing force between the driving V-shaped groove, the driven V-shaped groove, and the belt. When the input shaft 11 rotates, power is transmitted to the output shaft 22 by the frictional force between the V-groove and the belt 16, and power transmission is realized.

Transmission ratio variation

As seen in FIG. 4, when the shift control lever 23 is at its leftmost position under the control of the shift control mechanism 24, the cage 13 is also at its leftmost position. At the moment, the distance between the driving movable disc 14 and the driving fixed disc 15 is the largest, the driving belt 16 is closest to the center of the driving V-shaped groove, and the driving rotating radius is the smallest; the distance between the driven disc 20 and the driven fixed disc 21 is the smallest, and the transmission belt 16 is the farthest from the driven V-shaped groove center, namely, the driven rotating radius is the largest, so that the transmission ratio is the largest at the moment.

When the transmission ratio is to be reduced, as shown in fig. 5, the speed change control mechanism 24 drives the speed change control rod 23 to move rightwards, so as to drive the retainer 13 and the driving disc 14 to move rightwards, and extrude the transmission belt 16 to move towards the excircle of the driving V-shaped groove, so that the driving rotation radius is increased; the driven disc 20 moves rightwards under the pressing action of the transmission belt 16, the transmission belt 16 moves towards the center of the driven V-shaped groove, the driven rotating radius is reduced, and the transmission ratio is reduced from large to small.

When the shift control lever 23 is moved leftward by the shift control mechanism 24, the transmission ratio is changed from small to large.

Pressing force adjustment between the groove and the belt

The tension generated by the belt 16 can be changed by adjusting the downward pressure of the tension pulley 18 by the tension mechanism 17, thereby adjusting the pressing force between the V-shaped groove and the belt.

When the pressing force of the tension pulley 18 is reduced, the pressing force between the V-shaped groove and the transmission belt 16 is correspondingly reduced, and the transmission torque is also reduced.

When the pressing force of the tension pulley 18 increases, the pressing force between the V-shaped groove and the transmission belt 16 increases accordingly, and the transmission torque also increases.

When the transmission does not need to transmit power, the tensioning mechanism 17 adjusts the downward pressure of the tensioning wheel 17 to be zero, so that the transmission belt 16 has no tensioning force, and no pressing force exists between the V-shaped groove and the transmission belt.

For reliable tensioning, a tensioning mechanism, a tensioning wheel, may be provided on both sides of the belt 16, as shown in fig. 6.

The mechanical stepless speed changer utilizes the tension pulley to provide pressing force between the V-shaped groove of the stepless speed changer and the transmission belt, utilizes the speed change control mechanism to realize the change of the transmission ratio, completely overcomes various defects of the traditional stepless speed changer, and has the following advantages: (1) because the pressing force between the V-shaped groove and the transmission belt never disappears, the phenomenon of slipping between the V-shaped groove and the transmission belt cannot occur. (2) The transmission torque is large, and the pressing force between the V-shaped groove and the transmission belt is easy to increase, so that larger torque can be transmitted without limiting the torque output of an engine. (3) The speed change response is fast, a mechanism capable of changing speed fast is adopted, and meanwhile, the pressing force between the V-shaped groove and the transmission belt never disappears, so that the fast speed change can be realized, the acceleration performance of the automobile can be fully exerted, and the driving experience is extremely strong. (4) The hydraulic control system is not used, the manufacturing difficulty and cost of the transmission are reduced, and the fuel efficiency of the automobile is improved.

The embodiments described above are merely exemplary embodiments of the present invention, and are not intended to limit the present invention in any way, and other variations and modifications are possible without departing from the scope of the invention as set forth in the claims. The technical scheme of the invention is partially changed without creative labor, or equivalent replacement of partial technical characteristics of the technical scheme of the invention belongs to the protection scope of the invention.