CN106051129B - A kind of Novel CVT gearbox - Google Patents

Abstract

The invention relates to a new type of CVT gearbox, which includes a driving wheel disc, a driving wheel fixed disc, a driven wheel disc, a driven wheel fixed disc and a silent chain, the silent chain includes a chain plate, a curved pin shaft and a short pin shaft, and the chain plate There are through holes on the top, and a set of pin shafts are interspersed at both ends of the through holes, each set of pin shafts includes a curved pin shaft and a short pin shaft, and the curved pin shafts and short pin shafts fit together , and the side of the bonding side forms a rolling surface, the inclination angle of the arc surface at the bent end of the bending pin is 17° to 23°, and the inclination angle of the arc surface at the straight end of the bending pin is 1° to 3°, And the radius of curvature of the arc surface at the bent end is 100-170mm, and the radius of curvature of the arc surface at the straight end is 150-200mm. The silent chain of the present invention has two kinds of pin shafts. During the transmission process, the circular arc surfaces of the two pin shafts perform pure rolling, which plays the role of pitch change, reduces the vibration and noise of the chain, and improves the efficiency of chain transmission.

Description

A new type of CVT gearbox

technical field

The invention belongs to the field of gearboxes, in particular to a novel CVT gearbox.

Background technique

For a long time, the key components of known CVT transmissions are chains or steel belts, and the end surfaces on both sides of the chains and steel belts are symmetrical relative to the center. The chain is composed of one or more chain plates, and its pitch is one or two pitches, and the length of the chain is arranged in an orderly manner to match the transmission ratio and center distance of the gearbox. The pin shaft is a non-circular intended pin shaft, which is positioned on the side of the positioning hole of the chain plate. There are four pin shafts in each chain plate hole, and a pair of two pins form a hinge pair where the two pin shafts roll against each other, so as to achieve durability. Grinding and noise effects. The two ends of the pin shaft are symmetrical arc surfaces, and the arc surfaces are frictionally transmitted with the cone discs. There are four cone discs, two moving discs and two fixed discs, which are respectively on the gearbox input shaft, two output shafts, and the input shaft The moving plate and the fixed plate of the output shaft are on the same side. By changing the distance between the two cones, the radius of the chain around the circle is adjusted, so as to change the transmission ratio and realize the effect of speed change. The advantage of this type of gearbox is that the transmission ratio is stable, and the design and manufacture are simple, but the disadvantage is that the gearbox occupies a large space and the speed ratio range is small.

In automobiles, especially in new energy vehicles, due to the arrangement of the automobile engine, gearbox and motor together, due to the existence of the drive motor, it is difficult to achieve the desired effect in the overall layout of the automobile, and the traditional continuously variable transmission cannot be used. As mentioned above, since there is only one hole in the chain plate of the silent chain, two pins are respectively arranged at both ends of the length direction in one hole, and the lengths of the pins are the same. And the large end faces of the two pin shafts are placed back to back, which produces an anti-rolling effect when the chain rotates, thereby reducing wear and tear. The end faces on both sides of the pin shaft are symmetrical, so that when the transmission ratio of the continuously variable transmission changes, the amount of deflection of the chain increases, which increases the wear between the hinge pairs of the chain and reduces the transmission efficiency of the transmission.

Contents of the invention

In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a novel CVT gearbox with low noise and large gear ratio.

In order to achieve the above object, the present invention adopts the following technical solutions:

A new type of CVT gearbox, including the invention of the driving disc, the driving disc, the driven disc, the driven disc, and the silent chain. Between the invention of the driving wheel fixed plate, the other end is set between the invention of the driven wheel driven plate and the invention of the driven wheel fixed plate. The invention of the silent chain includes the invention of the chain plate, the invention of the curved pin shaft and the invention of the short pin shaft. The chain plate The invention is provided with a through hole, and a group of pin shafts are interspersed at both ends of the through hole, and each group of pin shafts includes a curved pin shaft invention and a short pin shaft invention, and the curved pin shaft invention and the short pin shaft The shaft inventions are attached to each other, and the side of the joint side forms an opposing rolling surface. One end of the curved pin shaft invention is bent, and the two ends of the curved pin shaft invention are connected to the driving wheel driving disc invention, the driving wheel fixed disc invention or The invention of the driven wheel disc and the invention of the fixed plate of the driven wheel are both friction transmissions. The two ends of the invention of the curved pin shaft all have arc surfaces, and the inclination angle of the arc surface of the invention of the bent end of the invention of the bent pin shaft is 17°～ 23°, the inclination angle of the arc surface invented by the straight end invented by the bent pin shaft is 1°～3°, and the radius of curvature of the arc surface invented by the bent end is 100-170mm, the curvature of the arc surface invented by the straight end The radius is 150-200mm.

As a preferred solution: one end of the short pin shaft invention has an arc surface, and the inclination angle of the arc surface is 17°-23°.

As a preferred solution: the radius of curvature of the arc of the rolling surface of the curved pin invention and the short pin invention is 0.4-0.8 times the pitch of the silent chain invention, and the cross-sectional area of the curved pin invention is larger than the short pin The cross-sectional area of the invention.

As a preferred solution: the two ends of the invention of the curved pin shaft and the invention of the short pin shaft are also respectively welded with the invention of stop pins.

As a preferred solution: the invention of the driving disc and the invention of the driven disc are located on the same side. The space occupied by the CVT gearbox is further reduced, which is beneficial to the layout of other components of the vehicle.

Due to the adoption of the above technical solution, the present invention makes the internal chain plates and pin shafts of the silent chain evenly stressed during the power transmission process, which can reduce the polygonal effect of the chain and reduce noise. At the same time, the moving cone of the gearbox is on the same side. Because the head of the pin shaft is bent on the side of the moving disk, the height of the chain plate can be reduced, and the weight of the chain can be reduced. fuel consumption. The chain deflection is reduced, the internal friction of the chain is reduced, and the transmission efficiency of the gearbox is improved, and the arrangement of the cone on the same side greatly reduces the volume and weight of the gearbox, making the gearbox more flexible and widely used.

Description of drawings

Fig. 1 is a structural schematic diagram of the gearbox of the present invention.

Fig. 2 is a schematic side view of the gearbox of the present invention.

Fig. 3 is a schematic diagram of the top structure of the silent chain of the present invention.

Fig. 4 is a schematic side view of the silent chain of the present invention.

Fig. 5 is a schematic cross-sectional structure diagram of the silent chain of the present invention.

Fig. 6 is a schematic diagram of the structure of the bending pin of the present invention.

Fig. 7 is a schematic structural view of the short pin shaft of the present invention.

Fig. 8 is a structural schematic diagram of the chain plate of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " The orientations or positional relationships indicated by "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise" are based on the attached The orientation or positional relationship shown in the figure is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a reference to this invention. Invention Limitations.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

A kind of novel CVT transmission box as shown in Figure 1-Fig. One end is sleeved between the driving wheel disk 1 and the driving wheel fixed disk 3, and the other end is sleeved between the driven wheel disk 2 and the driven wheel fixed disk 4. The silent chain 5 includes a chain plate 51, a curved pin shaft 521 and Short pins 522, the chain plate 51 is provided with through holes, two ends of the through holes are interspersed with a set of pins, each set of pins includes a bent pin 521 and a short pin 522, The curved pin 521 and the short pin 522 are attached to each other, and the side of the attached side forms a rolling surface. One end of the curved pin 521 is bent, and the two ends of the curved pin 521 are in contact with the driving wheel. Disc 1, driving wheel fixed disc 3 or driven wheel driven disc 2, driven wheel fixed disc 4 are all friction transmission, both ends of the curved pin 521 have arc surfaces, and the bent end 5211 of the curved pin 521 The inclination angle of the arc surface is 17°～23°, the inclination angle of the arc surface of the straight end 5212 of the bent pin 521 is 1°～3°, and the radius of curvature of the arc surface of the bent end 5211 is 100-170mm, The radius of curvature of the arc surface of the straight end 5212 is 150-200mm.

One end of the short pin shaft 522 has an arc surface, and the inclination angle of the arc surface is 17°-23°. The radius of curvature of the arc of the curved pin 521 and the short pin 522 on the rolling surface is 0.4-0.8 times the pitch of the silent chain 5, and the cross-sectional area of the curved pin 521 is larger than that of the short pin 522 . The driving disc 1 and the driven disc 2 are located on the same side. Due to the asymmetric form of the end faces on both sides of the chain, the present invention furthermore arranges the driving and driven fixed plates of the gearbox on the same side, thereby greatly reducing the overall size and reducing the lateral size of the gearbox by more than one-third. Thus, the arrangement of the automobile engine and gearbox is more rationalized.

Stop pins 53 are welded to both ends of the bent pin shaft 521 and the short pin shaft 522 respectively. The frame structure of the chain is fixed by welding the stop pin on the pin shaft. The distance between the welded stop pin and the end face is relatively large in the direction of the larger inclination angle. Because of the small distance between the chain plate and the pin shaft, the chain plate is easy to fall off, which makes the chain fall apart, causing the chain and even the entire chain to fall apart. The gearbox is damaged. At the same time, the position of the gear pin must be determined according to the height of the chain plate, so as to ensure that the outer eaves of the edge chain plate cannot interfere with the cone at any position when the transmission ratio changes. The welding position of the stub pin shall ensure that it does not contact the cone.

In the present invention, the short pin shaft paired with the bent pin shaft only serves as a connection, and does not contact the cone, which not only solves the interference problem, but also solves the problem of two pin shafts in a chain plate hole due to processing errors. Mesh impact, so this silent chain has less impact noise and higher efficiency. Compared with other types of CVT chains, the contact point between the curved pin shaft and the cone has a certain amount of downward movement, generally up to 4mm or more. This reduces the contact radius between the chain and the cone, increases the speed ratio range of the new CVT by nearly 10%, and reduces the fuel consumption of the vehicle. At the same time, the bending of the chain pin shaft can reduce the pitch of the chain plate, which is more than 30% smaller than that of the non-bending structure chain. That is to say, the weight of the chain is reduced, and the polygonal effect of the chain can be reduced, the noise is effectively reduced, and the comfort of the whole vehicle is improved.

The silent chain of the present invention has two kinds of pin shafts. During the transmission process, the circular arc surfaces of the two pin shafts perform pure rolling, which plays the role of pitch change, reduces the vibration and noise of the chain, and improves the efficiency of chain transmission. Due to the asymmetric arrangement on both sides of the pin shaft of the silent chain, the stress on the chain is relatively bad. Therefore, in the design, it should be considered that the resultant force of the pressure on the left and right sides should be on the symmetrical center line of the chain plate and be vertical upward, while In order to ensure the above requirements, the lower end of the pin shaft with an inclination angle of 1°-3° is in contact with the cone, and the upper end with an inclination angle of 17°-23° is in contact with the cone, so that the transmission can be guaranteed to run smoothly. And because there is only one inner chain plate, the chain assembly is greatly simplified. Since the chain bending pin and the cone are frictionally driven, both the bending pin and the short pin will roll during the transmission process of the chain, which reduces vibration and noise. In order to make the chain frame structure stable, after the chain plate and the pin shaft are assembled, the two ends of the pin shaft are fixed by welding stop pins. As a preference, since the larger the pitch, the polygonal effect will also increase correspondingly in the chain transmission, so in the selection of the chain, the small-pitch chain plates can also be selected from two or more pitch chain plates in the entire chain.

It should be noted that the above embodiments are only representative examples of the present invention. The present invention is also capable of many variations. Any simple modifications, equivalent changes and modifications made to the above embodiments according to the essence of the present invention shall be deemed to belong to the protection scope of the present invention.

Claims (5)

1. a kind of Novel CVT gearbox, it is characterised in that：Including driving wheel Moving plate (1), driving wheel price fixing (3), driven wheel Moving plate (2), driven wheel price fixing (4) and mute chain (5), described mute chain (5) one end are sleeved on driving wheel Moving plate (1) and driving wheel price fixing (3) between, the other end is sleeved between driven wheel Moving plate (2) and driven wheel price fixing (4), the mute chain (5) include carrier bar (51), It is bent axis pin (521) and short pin shaft (522), the carrier bar (51) is equipped with through-hole, and the both ends in the through-hole have been respectively interposed One group of axis pin, every group of axis pin include a bending axis pin (521) and a short pin shaft (522), the bending axis pin (521) and short Axis pin (522) is bonded to each other, and the side for being bonded side is formed to rolling face, one end bending of the bending axis pin (521), and curved The both ends of flex pin axis (521) and driving wheel Moving plate (1), driving wheel price fixing (3) or driven wheel Moving plate (2), driven wheel price fixing (4) It is frictional drive, the both ends of the bending axis pin (521) all have arc surface, the bending end (5211) of bending axis pin (521) The inclination angle of arc surface be 17 °~23 °, the inclination angle of the arc surface of the straight end (5212) of bending axis pin (521) is 1 °~3 °, and curved The radius of curvature for rolling over the arc surface of end (5211) is 100-170mm, and the radius of curvature of the arc surface of straight end (5212) is 150- 200mm。

2. a kind of Novel CVT gearbox according to claim 1, it is characterised in that：One end of the short pin shaft (522) has There is arc surface, and the inclination angle of arc surface is 17 °~23 °.

3. a kind of Novel CVT gearbox according to claim 1, it is characterised in that：The bending axis pin (521) and short pin The radius of curvature of the circular arc to rolling face of axis (522) is 0.4-0.8 times of the pitch of mute chain (5), and is bent axis pin (521) Sectional area is more than the sectional area of short pin shaft (522).

4. a kind of Novel CVT gearbox according to claim 1, it is characterised in that：The bending axis pin (521) and short pin The both ends of axis (522) are also respectively welded backing pin (53).

5. a kind of Novel CVT gearbox according to claim 1, it is characterised in that：The driving wheel Moving plate (1) and driven Wheel Moving plate (2) is located at the same side.