阅读说明：本技术 一种新型cvt变速装置 (Novel CVT speed change device ) 是由 马国利 郭星 焦永生 于 2021-04-29 设计创作，主要内容包括：本发明涉及一种新型CVT变速装置,包括八爪机构、锥轴驱动机构、动力输入输出机构,其中八爪机构设为两套、且分别设置于主动轮、从动轮上,八爪机构在主动轮及从动轮的径向能实现伸出与收缩,主动轮上的八爪机构与从动轮上的八爪机构通过链条实现动力传输,保证了与链条包络的直径增大或缩小,从而实现了连续改变主动轮与从动轮转动的传动比。本发明中动力通过链条与八爪机构的啮合传动,当负载增大到临界值时,不会产生打滑现象,克服了传统技术中CVT变速箱在动力传输中出现的缺点与弊端,能提供更大的扭矩,实现大功率传输。本发明CVT变速装置中,整体结构紧凑、刚性稳定、可靠性强,并降低了核心零件的加工难度及生产制造成本。(The invention relates to a novel CVT (continuously variable transmission) speed changing device which comprises eight-claw mechanisms, a conical shaft driving mechanism and a power input and output mechanism, wherein the eight-claw mechanisms are arranged in two sets and are respectively arranged on a driving wheel and a driven wheel, the eight-claw mechanisms can extend and contract in the radial directions of the driving wheel and the driven wheel, the eight-claw mechanisms on the driving wheel and the eight-claw mechanisms on the driven wheel realize power transmission through chains, the diameter enveloped with the chains is increased or reduced, and therefore the transmission ratio of the rotation of the driving wheel and the driven wheel is continuously changed. The power is transmitted by the meshing of the chain and the eight-claw mechanism, when the load is increased to a critical value, the slipping phenomenon is avoided, the defects and shortcomings of a CVT gearbox in the traditional technology in power transmission are overcome, larger torque can be provided, and high-power transmission is realized. The CVT speed changing device has the advantages of compact integral structure, stable rigidity and strong reliability, and reduces the processing difficulty and the production and manufacturing cost of core parts.)

1. A novel CVT speed change device is characterized in that: comprises an eight-claw mechanism, a conical shaft driving mechanism and a power input and output mechanism;

the eight-claw mechanisms are arranged in two sets and are respectively arranged on the driving wheel and the driven wheel, the eight-claw mechanisms can stretch out and contract in the radial direction of the driving wheel and the driven wheel, power transmission is realized through chains by the eight-claw mechanisms on the driving wheel and the eight-claw mechanisms on the driven wheel, the diameter enveloping with the chains is increased or reduced, and therefore the transmission ratio of the driving wheel to the driven wheel to rotate is continuously changed.

2. A novel CVT transmission as in claim 1 wherein: the eight-claw mechanism comprises eight claws, a supporting wheel, a pin shaft, a reset spring and a positioning pin, wherein the eight claws are arranged on a driving wheel and a driven wheel, sliding grooves are formed in the driving wheel and the driven wheel and serve as sliding rails for the eight claws to stretch out and draw back, the bottoms of the eight claws are in high-friction pair contact with the outer surface of a conical shaft of the conical shaft driving mechanism through ball heads, and the eight claws stretch out and draw back in the radial direction through the axial reciprocating motion of the conical shaft.

3. A novel CVT transmission as in claim 2 wherein: when the eight claws extend out, the large end of the conical shaft moves towards the contact; when the eight claws are retracted, the small end of the awl shaft moves toward the contact point.

4. A novel CVT transmission as in claim 2 wherein: the eight-claw mechanism arranged on one side of the driving wheel radially stretches and retracts and simultaneously rotates along with the driving wheel, and transmits power to the chain; the chain transmits power to the eight-claw mechanism on one side of the driven wheel while the eight-claw mechanism on one side of the driven wheel stretches out and draws back in the radial direction, and the driven wheel is driven to rotate, so that power output is achieved.

5. A novel CVT transmission as in claim 2 wherein: the supporting wheel is fixed on the eight claws through a pin shaft, two positioning pins and two sides of the supporting wheel are symmetrically arranged on each eight claw, and the positioning pins are provided with reset springs.

6. A novel CVT transmission as in claim 1 wherein: the cone shaft driving mechanism comprises: the device comprises a conical shaft, a tooth-shaped push rod, a ball guide sleeve, a positioning sleeve, a mounting seat, a transmission gear, a gear shaft, a synchronous belt wheel, a synchronous belt, a T-shaped bearing and a servo motor, wherein the conical shaft is fixedly connected and coaxially arranged with one end of the tooth-shaped push rod, the other end of the tooth-shaped push rod is arranged in the positioning sleeve through the ball guide sleeve, and the positioning sleeve is arranged on the mounting seat; the tooth-shaped push rod is meshed with the transmission gear to achieve power transmission, the transmission gear is arranged at one end of the gear shaft, the other end of the gear shaft is provided with a synchronous belt wheel, a synchronous belt is meshed on the synchronous belt wheel, and a power output shaft of the servo motor is connected with the gear shaft.

7. A novel CVT transmission as in claim 6 wherein: the two sets of servo motors are arranged, and the two sets of cone shaft driving mechanisms are arranged in the driving wheel and the driven wheel respectively;

the outer surface of the conical shaft is in contact with the ball heads of the eight claws to form a rigid supporting point, and positive thrust is applied to the eight claws in the normal direction to push the eight claws to extend out in the positive direction; under the action of a return spring, the eight claws retract reversely.

8. A novel CVT transmission as in claim 1 wherein: the power input and output mechanism comprises an input shaft transmission flange, a driving wheel, a driven wheel, an output shaft transmission flange and a chain, power is transmitted to the driving wheel through the input shaft transmission flange, the driving wheel drives the eight-claw mechanism on the driving wheel to move, the eight-claw mechanism drives the chain to move while radially extending or contracting, then the power is transmitted to the eight-claw mechanism on the driven wheel and the driven wheel, and the power is output through the output shaft transmission flange.

9. A novel CVT transmission as in claim 8 wherein: and the power input and output mechanism transmits corresponding rotating speed and torque to a load according to the state of the eight-claw mechanism.

10. A novel CVT transmission as in claim 1 wherein: the eight-claw mechanism, the conical shaft driving mechanism and the power input and output mechanism are arranged in a split mode.

Technical Field

The invention relates to the technical field of continuously variable transmissions, in particular to a novel CVT speed changing device.

Background

The transmission of the automobile speed changer is realized by a gear transmission, so that the power of an engine is transmitted to a transmission shaft, and the requirements of the automobile on traction and running speed under different road conditions are met.

At present, in the CVT (continuously Variable transmission) transmission of the same type, steel belt transmission is generally adopted, and the steel belt and the cone surface of a working wheel are in friction transmission. When the load is increased to a critical value, the steel belt can generate a slipping phenomenon due to insufficient torque value, so that the power output is insufficient, the acceleration is slow, the power transmission is greatly limited, and the defects of the CVT gearbox in a transmission system are caused.

Disclosure of Invention

It is a primary object of the present invention to overcome at least one of the deficiencies of the prior art and to provide a novel CVT transmission that achieves high torque, high power transmission.

The novel CVT speed changing device adopts the meshing transmission of a steel chain and an eight-claw mechanism, and when the load is increased to a critical value, the slipping phenomenon cannot occur. The transmission system with the same size and specification can provide larger torque, realize high-power transmission and overcome the defects of the traditional CVT transmission in power transmission.

In order to realize the technical scheme, the invention adopts the following technical scheme:

according to an aspect of the present invention, there is provided a novel CVT transmission device comprising: the eight-claw mechanism, the conical shaft driving mechanism and the power input and output mechanism;

the eight-claw mechanisms are arranged in two sets and are respectively arranged on the driving wheel and the driven wheel, the eight-claw mechanisms can stretch out and contract in the radial direction of the driving wheel and the driven wheel, power transmission is realized through chains by the eight-claw mechanisms on the driving wheel and the eight-claw mechanisms on the driven wheel, the diameter enveloping with the chains is increased or reduced, and therefore the transmission ratio of the driving wheel to the driven wheel to rotate is continuously changed.

According to one embodiment of the invention, the eight-claw mechanism comprises eight claws, a supporting wheel, a pin shaft, a return spring and a positioning pin, the eight claws are arranged on a driving wheel and a driven wheel, sliding grooves are respectively arranged on the driving wheel and the driven wheel and are used as sliding rails for eight-claw expansion, the bottoms of the eight claws are in high-friction pair contact with the outer surface of a conical shaft of the conical shaft driving mechanism through ball heads, and the eight claws expand radially through axial reciprocating motion of the conical shaft.

According to one embodiment of the invention, when the eight claws are extended, the large end of the conical shaft moves towards the contact point; when the eight claws are retracted, the small end of the awl shaft moves toward the contact point.

According to one embodiment of the invention, the eight-claw mechanism arranged on one side of the driving wheel radially stretches and retracts and simultaneously rotates along with the driving wheel, and transmits power to the chain; the chain transmits power to the eight-claw mechanism on one side of the driven wheel while the eight-claw mechanism on one side of the driven wheel stretches out and draws back in the radial direction, and the driven wheel is driven to rotate, so that power output is achieved.

According to one embodiment of the invention, the supporting wheel is fixed on the eight claws through a pin shaft, two positioning pins are symmetrically arranged on each eight claw and are respectively arranged on two sides of the supporting wheel, and the positioning pins are provided with return springs.

According to an embodiment of the present invention, the cone shaft driving mechanism includes: the device comprises a conical shaft, a tooth-shaped push rod, a ball guide sleeve, a positioning sleeve, a mounting seat, a transmission gear, a gear shaft, a synchronous belt wheel, a synchronous belt, a T-shaped bearing and a servo motor, wherein the conical shaft is fixedly connected and coaxially arranged with one end of the tooth-shaped push rod, the other end of the tooth-shaped push rod is arranged in the positioning sleeve through the ball guide sleeve, and the positioning sleeve is arranged on the mounting seat; the tooth-shaped push rod is meshed with the transmission gear to achieve power transmission, the transmission gear is arranged at one end of the gear shaft, the other end of the gear shaft is provided with a synchronous belt wheel, a synchronous belt is meshed on the synchronous belt wheel, and a power output shaft of the servo motor is connected with the gear shaft.

According to an embodiment of the invention, the gear shaft is fixed on the mounting base by a T-shaped bearing.

According to one embodiment of the invention, the number of the servo motors is two, and the two sets of the cone shaft driving mechanisms are respectively arranged in the driving wheel and the driven wheel;

the outer surface of the conical shaft is in contact with the ball heads of the eight claws to form a rigid supporting point, and positive thrust is applied to the eight claws in the normal direction to push the eight claws to extend out in the positive direction; under the action of a return spring, the eight claws retract reversely.

In the invention, the servo motor receives an operation instruction and drives the gear shaft to rotate in the forward direction or the reverse direction according to the working condition load condition. The transmission gear rotates along with the gear shaft to push the tooth-shaped push rod to reciprocate. The conical shaft is fixedly and rigidly connected with the tooth-shaped push rod, and the conical shaft rotates along with the positive direction or the reverse direction of the servo motor to realize axial reciprocating linear motion. The power output shaft of the servo motor is connected with the gear shaft, synchronous opposite movement of the two sets of conical shafts is guaranteed through synchronous belt transmission, the enveloping diameter formed by the chain on the driving wheel is guaranteed to be increased, the enveloping diameter formed by the chain on the driven wheel is synchronously reduced, or the enveloping diameter formed by the chain on the driving wheel is reduced, and the enveloping diameter of the chain on the driven wheel is synchronously increased, so that the continuous change of the rotating speed ratio of the driving wheel and the driven wheel is realized, and the purpose of stepless speed change is achieved.

According to an embodiment of the invention, the power input and output mechanism comprises an input shaft transmission flange, a driving wheel, a driven wheel, an output shaft transmission flange and a chain, wherein power is transmitted to the driving wheel through the input shaft transmission flange, the driving wheel drives an eight-claw mechanism on the driving wheel to move, the eight-claw mechanism radially extends or contracts and simultaneously drives the chain to move, so that the power is transmitted to the eight-claw mechanism on the driven wheel and the driven wheel, and the power is output through the output shaft transmission flange.

According to an embodiment of the present invention, the driving wheel and the driven wheel are disposed on the mounting seat through rolling bearings.

According to one embodiment of the present invention, the power input/output mechanism transmits a corresponding rotational speed and torque to a load according to the state of the eight-claw mechanism.

According to an embodiment of the invention, the eight-claw mechanism, the conical shaft driving mechanism and the power input and output mechanism are arranged in a split mode.

According to an embodiment of the invention, the eight-claw mechanism and the chain are in toothed engagement to realize power transmission.

According to an embodiment of the invention, the chain is a steel chain.

According to the technical scheme, the invention has at least one of the following advantages and positive effects:

in the invention, power is transmitted by the meshing of the chain and the eight-claw mechanism, when the load is increased to a critical value, the slipping phenomenon can not be generated, the defects and shortcomings of the CVT gearbox in the traditional technology in power transmission are overcome, larger torque can be provided, and high-power transmission is realized.

The CVT speed changing device has the advantages of compact integral structure, stable rigidity and strong reliability, and reduces the processing difficulty and the production and manufacturing cost of core parts.

Drawings

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a CVT transmission of the present invention;

FIG. 2 is a cross-sectional view taken along line D-D of FIG. 1;

FIG. 3 is a cross-sectional view of a servo motor shaft;

fig. 4 is a sectional view F-F of fig. 1.

The reference numerals are explained below:

1-a cone axis; 2-driving wheel; 3-driven wheel; 4-a support wheel; 5-a pin shaft; 6-a chain; 7-a positioning pin; 8-a return spring; 9-eight claws; 10-plug screw; 11-rolling bearings; 12-a bearing sleeve; 14-round nuts; 15-bolt; 16-a sealed housing; 20-conical shaft locking screw; 21-tooth-shaped push rod; 22-ball guide sleeve; 23-a positioning sleeve; 25-a mounting seat; 26-a synchronous belt; 27-a synchronous pulley; 28-gear shaft; 29-a servo motor; a 30-T bearing; 31-a sealing ring; 32-a drive gear; 33-locking nut.

Detailed Description

In the description of the present invention, "a plurality" means two or more unless otherwise specified. The terms "inner," "upper," "lower," and the like, refer to an orientation or a state relationship based on that shown in the drawings, which is for convenience in describing and simplifying the description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. To those of ordinary skill in the art, the specific meanings of the above terms in the present invention are understood according to specific situations.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged under appropriate circumstances in order to facilitate the description of the embodiments of the invention herein.

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 4, fig. 1 is a schematic view showing a construction of a CVT transmission of the present invention, fig. 2 is a sectional view taken along line D-D of fig. 1, fig. 3 is a sectional view taken along a shaft of a servo motor, and fig. 4 is a sectional view taken along line F-F of fig. 1. The invention provides a novel CVT speed changing device, which comprises: the eight-claw mechanism, the conical shaft driving mechanism and the power input and output mechanism are arranged in a split mode.

In the invention, the eight-claw mechanisms are arranged in two sets and are respectively arranged on the driving wheel 2 and the driven wheel 3, the eight-claw mechanisms can realize extension and contraction in the radial direction of the driving wheel 2 and the driven wheel 3, the eight-claw mechanisms on the driving wheel 2 and the eight-claw mechanisms on the driven wheel 3 realize power transmission through the chain 6, the diameter enveloped with the chain 6 is ensured to be increased or reduced, and thus the transmission ratio of the rotation of the driving wheel 2 and the driven wheel 3 is continuously changed. Further, eight claw mechanisms include eight claws 9, supporting wheel 4, round pin axle 5, reset spring 8, locating pin 7, eight claws 9 are installed on action wheel 2, follow driving wheel 3, all be equipped with the sliding tray on action wheel 2, the follow driving wheel 3, as the flexible slip track of eight claws 9, the bottom of eight claws 9 is passed through the bulb and is realized high friction pair contact with conical shaft 1 surface of conical shaft actuating mechanism, has guaranteed that eight claw mechanisms produce when rotating around the axle center frictional resistance less, has reduced the power loss of device, has improved transmission efficiency. The radial extension and contraction of the eight claws 9 are realized by the axial reciprocating motion of the cone shaft 1.

When the eight claws 9 extend out, the large end of the conical shaft 1 moves to the contact; when the eight claws 9 are retracted, the small end of the awl shaft 1 moves toward the contact point. The eight-claw mechanism arranged on one side of the driving wheel 2 radially stretches and retracts and simultaneously rotates along with the driving wheel 2, and transmits power to the chain 6; the eight-claw mechanism arranged on one side of the driven wheel 3 stretches out and draws back in the radial direction, and the chain 6 transmits power to the eight-claw mechanism on one side of the driven wheel 3 and drives the driven wheel 3 to rotate, so that power output is achieved.

In this embodiment, the supporting wheel 4 is fixed on eight claws 9 through a pin 5, two positioning pins 7 and two sides of the supporting wheel 4 are symmetrically arranged on each eight claw 9, a return spring 8 is arranged on the positioning pin 7, and a plug 10 is arranged at the top of the positioning pin 7. The plug 10 prevents the return spring 8 and the positioning pin 7 from being separated.

In the invention, the cone shaft driving mechanism comprises a cone shaft 1, a tooth-shaped push rod 21, a ball guide sleeve 22, a positioning sleeve 23, a mounting seat 25, a transmission gear 32, a gear shaft 28, a synchronous pulley 27, a synchronous belt 26, a T-shaped bearing 30 and a servo motor 29, wherein the cone shaft 1 is fixedly connected and coaxially arranged with one end of the tooth-shaped push rod 21, the other end of the tooth-shaped push rod 21 is arranged in the positioning sleeve 23 through the ball guide sleeve 22, and the positioning sleeve 23 is arranged on the mounting seat 25; the tooth-shaped push rod 21 is meshed with a transmission gear 32 to achieve power transmission, the transmission gear 32 is arranged at one end of a gear shaft 28 through a locking nut 33, a synchronous pulley 27 is arranged at the other end of the gear shaft 28, a synchronous belt 26 is meshed on the synchronous pulley 27, the gear shaft 28 is fixed on a mounting base 25 through a T-shaped bearing 30, and a power output shaft of a servo motor 29 is connected with the gear shaft 28. Furthermore, two sets of servo motors 29 are provided, and two sets of cone shaft driving mechanisms are provided and are respectively arranged in the driving wheel 2 and the driven wheel 3; the outer surface of the conical shaft 1 is in contact with a ball head of the eight claws 9 to form a rigid supporting point, and positive thrust is applied to the eight claws 9 in the normal direction to push the eight claws 9 to extend out in the positive direction; the eight claws 9 retract in opposite directions under the action of the return spring 8.

Specifically, the conical shaft 1 applies a positive thrust to the eight claws 9 in the normal direction, and pushes the eight claws 9 to extend in the positive direction until the maximum limit position is reached after overcoming the pressure of the return springs 8 on both sides and the normal pressure of the chain 6, as shown in fig. 2. On the return stroke, under the action of the return spring 8, the eight claws 9 retract reversely until reaching the minimum limit position. When the eight claws 9 in the driven wheel 3 expand out in the positive direction, the eight claws 9 in the driving wheel 2 retract synchronously in the reverse direction.

In the present invention, the servo motor 29 receives an operation instruction and drives the gear shaft 28 to rotate forward or backward according to the working condition load condition. The transmission gear 32 rotates with the gear shaft 28 to push the tooth-shaped push rod 21 to reciprocate. The conical shaft 1 is fixedly and rigidly connected with the tooth-shaped push rod 21, and the conical shaft 1 rotates along with the positive direction or the reverse direction of the servo motor 29 to realize axial reciprocating linear motion. The power output shaft of the servo motor 29 is connected with the gear shaft 28, and is driven by the synchronous belt 26, so that the two sets of conical shafts 1 can synchronously move in opposite directions during movement, the enveloping diameter formed by the chains 6 on the driving wheel 2 is increased, and the enveloping diameter of the chains 6 on the driven wheel 3 is synchronously reduced; or the enveloping diameter formed by the chain 6 on the driving wheel 2 is ensured to be reduced, and the enveloping diameter of the chain 6 on the driven wheel 3 is synchronously increased, so that the continuous change of the rotating speed ratio of the driving wheel 2 and the driven wheel 3 is realized, and the purpose of stepless speed change is achieved. Further, the cone shaft 1 is fixedly connected with one end of a tooth-shaped push rod 21 through a cone shaft locking screw 20.

In the invention, the power of the cone shaft driving mechanism is provided by a servo motor 29, the servo motor 29 is arranged on a gear shaft 28, as shown in fig. 3, the gear shaft 28 is fixed by two T-shaped bearings 30, a transmission gear 32 and a synchronous pulley 27 are respectively arranged at the upper end and the lower end of the gear shaft 28, the transmission gear 32 is meshed with a tooth-shaped push rod 21 without backlash, and then the tooth-shaped push rod 21 and the cone shaft 1 are pushed to axially move, wherein the cone shaft 1 is fixedly connected with the tooth-shaped push rod 21, and the ball guide sleeve 22 ensures the linearity of the tooth-shaped push rod 21 during axial movement.

In the invention, the power input and output mechanism comprises an input shaft transmission flange, a driving wheel 2, a driven wheel 3, an output shaft transmission flange and a chain 6, power is transmitted to the driving wheel 2 through the input shaft transmission flange, the driving wheel 2 drives an eight-claw mechanism on the driving wheel to move, the eight-claw mechanism drives the chain 6 to move while radially extending or contracting, and then the power is transmitted to the eight-claw mechanism on the driven wheel 3 and the driven wheel 3, and the power is output through the output shaft transmission flange. The driving wheel 2 and the driven wheel 3 are arranged on the mounting seat 25 through a rolling bearing 11. The two ends of the driving wheel 2 and the driven wheel 3 are radially supported by rolling bearings 11 and are axially locked by round nuts 14.

And the power input and output mechanism transmits corresponding rotating speed and torque to a load according to the state of the eight-claw mechanism. In this embodiment, the eight-claw mechanism and the chain 6 are engaged in a tooth form to realize power transmission, and the chain 6 is a steel chain.

The working principle of the invention is as follows: the cone shaft driving mechanism synchronously reciprocates to push the two sets of eight-claw mechanisms to do radial telescopic motion, and the diameter formed by the two sets of eight-claw mechanisms and the chain in an enveloping way can be continuously and synchronously increased or reduced. The eight-claw mechanism rotates together with the driving wheel 2 and the driven wheel 3 while contracting in the radial direction, and performs input and output of power together. The CVT speed change device transmits the rotating speeds and torques under different working conditions at a continuously variable transmission ratio during power transmission.

In summary, in the invention, power is transmitted by the engagement of the chain and the eight-claw mechanism, when the load is increased to a critical value, the slipping phenomenon is avoided, the defects and shortcomings of the CVT gearbox in the traditional technology in power transmission are overcome, larger torque can be provided, and high-power transmission is realized.

The CVT speed changing device has the advantages of compact integral structure, stable rigidity and strong reliability, and reduces the processing difficulty and the production and manufacturing cost of core parts.

It is to be understood that the invention is not limited in its application to the details of construction and the arrangement of components set forth herein. The invention is capable of other embodiments and of being practiced and carried out in various ways. The foregoing variations and modifications fall within the scope of the present invention. It will be understood that the invention disclosed and defined herein extends to all alternative combinations of two or more of the individual features mentioned or evident from the text and/or drawings. The embodiments described herein explain the best modes known for practicing the invention and will enable others skilled in the art to utilize the invention.