CN210715727U

CN210715727U - Continuously variable transmission and buffer mechanism thereof

Info

Publication number: CN210715727U
Application number: CN201921855169.XU
Authority: CN
Inventors: 伍立伟; 黄敏
Original assignee: Chongqing Zongshen Cvt Co ltd
Current assignee: Chongqing Zongshen Cvt Co ltd
Priority date: 2019-10-31
Filing date: 2019-10-31
Publication date: 2020-06-09
Anticipated expiration: 2029-10-31

Abstract

The utility model discloses a continuously variable transmission and buffer gear thereof, including being located the transmission assembly of derailleur box, transmission assembly includes driving part and follower, its characterized in that: the transmission assembly is provided with a buffer mechanism, the buffer mechanism comprises an elastic buffer section and a rigid driving section which are arranged at intervals along the circumferential direction, and a gap is formed between the elastic buffer section and the rigid driving end. The utility model discloses a buffer gear transmission power seamless hookup, the loss of inefficiency basically. The buffer mechanism and the stepless speed changer can also effectively solve the problem of jitter in the variable working condition running process of the existing whole vehicle; the rigidity of a transmission system is reduced, and the torsional damping is improved.

Description

Continuously variable transmission and buffer mechanism thereof

Technical Field

The utility model relates to a CVT formula speed change mechanism especially relates to the buffer gear who sets up in the CVT.

Background

The chinese patent CN201910567280.7 discloses a continuously variable transmission, which adopts a mechanical speed regulation mode to solve the problem of low transmission efficiency caused by relying on hydraulic speed regulation and pressurization system in the existing continuously variable transmission technology.

However, in the above-mentioned patent continuously variable transmission, since there is no torque converter, the power is directly transmitted to the chain (the rocker pin chain and the steel belt), so that there are problems of impact, shaking and the like under the variable working conditions of starting, accelerating, decelerating and the like on the whole vehicle, and the service life is seriously affected. The utility model discloses a shake, the impact problem that exist more than solving.

Further, chinese patent CN207018433U discloses a damper flywheel for a CVT vehicle, which is incorporated between an engine and a CVT transmission together with a power unit, and in which a change in the rotational speed of an output shaft of the engine is reduced by an inertial force of the damper flywheel, and further, vibration or damping of the output shaft is reduced or alleviated by elasticity of a torsion spring incorporated therein.

Although the above patent mainly uses the weight of the flywheel for buffering, the effect is not obvious, and the above patent can not be applied to the mechanical speed-regulating CVT gearbox.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a make buncher moment of torsion transmission uninterrupted, the buffer gear of inefficiency loss.

In order to achieve the above object, the present invention is realized as follows: a buffer mechanism for a continuously variable transmission, comprising a transmission assembly located in a transmission case, the transmission assembly comprising a driving member and a driven member, characterized in that: the transmission assembly is provided with a buffer mechanism, the buffer mechanism comprises an elastic buffer section and a rigid driving section which are arranged at intervals along the circumferential direction, and a gap is formed between the elastic buffer section and the rigid driving end. This patent realizes buffer function through elastic buffer section and the rigid drive section at circumference cloth, and when the input torque was little torque state, moment transmitted through the elastic buffer section completely, when the moment of torsion exceeded the setting value, carried out the moment transmission by the rigid drive section for the moment of torsion transmission need not to be interrupted, and the inefficiency loss basically.

Preferably, the number of the elastic buffer sections and the number of the rigid driving sections are respectively multiple.

Furthermore, the elastic buffering section comprises spring limiting blocks arranged at two ends and a spring mounting block positioned between the two spring limiting blocks, two sides of the spring mounting block respectively form a spring mounting cavity with the spring mounting blocks at the two ends, a spring is arranged in the spring mounting cavity, one end of the spring is abutted against the spring mounting block, the other end of the spring is abutted against the spring limiting block, the spring limiting block is fixedly connected with the driving part or integrally arranged, and the spring mounting block is fixedly connected with the driven part or integrally arranged. The springs arranged on two sides of the spring mounting block can meet all gear requirements of positive and negative rotation of the whole vehicle, and torque values can be set more conveniently through the springs.

Further, be provided with between two adjacent spring buffer sections the rigidity drive section, the rigidity drive section is a driving block, the driving block with follower fixed connection or integrative setting, just driving block both ends have the circumference clearance with the spring stopper respectively. The transition of the moment from the elastic buffer section to the rigid drive section can be realized through the circumferential gap.

Further, the gap H is

Wherein N-set conversion torque

i-number of spring groups, two symmetrically arranged springs being one group

Coefficient of elasticity of k-spring

R-spring arrangement centerline radius

Preferably, the transmission assembly comprises a cam disc, a conical disc or a transmission gear, the opposite surfaces of the cam disc and the conical disc are respectively provided with a matched groove, a ball is arranged in the groove, and the buffer mechanism is arranged on the cam disc, the conical disc or the transmission gear.

Preferably, buffer gear sets up on the cam disc or drive gear, including the base as the driving piece and the cam disc or the drive gear as the follower, be provided with a plurality of spring stopper on the base and be in same side of spring stopper be provided with the integrative bottom surface of base be provided with spring installation piece and drive block on the cam disc or the drive gear settle between spring stopper and the spring installation piece the spring, clearance H has between the spring stopper of drive block and both sides.

Preferably, the buffer mechanism is arranged on the conical disc and comprises a rotating disc serving as a driving part and provided with a groove and a conical disc serving as a driven part, an inwardly protruding spring limiting block is arranged on an inner ring of the rotating disc, a spring mounting block and a driving block which protrude outwards and are matched with the spring limiting block are arranged on the inner ring of the conical disc, and a gap H is formed between the driving block and the spring blocks on two sides.

Furthermore, a dustproof cover is further arranged, and the dustproof cover seals the exposed surface of the buffer mechanism.

A continuously variable transmission comprises the damping mechanism.

Has the advantages that:

the utility model discloses an arrange the spring in circumference and realize buffer function, when the input torque is little torque state, moment transmits through the spring completely, surpasss the setting value (confirmed by the spring force value) when the moment of torsion, becomes direct contact by the spring buffering, carries out big moment of torsion transmission its moment of torsion transmission need not be interrupted, by the seamless hookup of spring to direct contact transmission power, the inefficiency loss basically.

And the base and the cam disc have a clearance H when not in working state, and the spring force value or the clearance H can be matched and adjusted through calculation; to provide the necessary travel required for the spring to transmit torque. Two groups of springs of the elastic buffer section are symmetrically arranged, and all requirements of reversing and forward blocking of the whole vehicle can be met.

And utility model's buffer gear designs in embedding buncher's drive disk assembly, does not occupy extra space at all, conveniently arranges.

In addition, the utility model discloses a buffer gear and buncher still can effectively solve the shake problem in the variable operating mode travel process of current whole car; the rigidity of a transmission system is reduced, and the torsional damping is improved.

Drawings

FIG. 1 is a structural diagram of a buffering structure arranged on a driving cam disc in an embodiment;

FIG. 2 is a structural view of a base;

FIG. 3 is a structural view illustrating a buffering structure provided on a transmission gear in the embodiment;

FIG. 4 is a structural diagram of the embodiment in which a buffer structure is arranged on an active fixed cone disk (including a dust cap);

FIG. 5 is an isometric view of FIG. 4 (without the dust cap);

FIG. 6 is a diagram of an active fixed cone disk junction;

fig. 7 is a view showing a structure of a rotary disk.

Detailed Description

The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings, but the present invention is not limited to these embodiments, and any modifications or replacements within the basic spirit of the embodiments still fall within the scope of the present invention claimed in the claims.

Example (b): as shown in fig. 1 to 7, the present embodiment provides a continuously variable transmission, and particularly provides a damper mechanism for a CVT.

The damper mechanism in this embodiment is provided in a transmission case of a CVT that includes an input member and an output member. A pair of conical disc assemblies and a flexible element clamped between the conical disc assemblies are respectively arranged on the input component and the output component. The input component comprises an input shaft and a pair of driving cone disc components arranged on the input shaft, the driving cone disc components comprise driving moving cone discs and driving fixed cone discs, the output component comprises an output shaft and a pair of driven cone disc components arranged on the output shaft, and the driven cone disc components comprise driven fixed cone discs and driven moving cone discs.

The driving fixed conical disc is in transmission connection with the input end of the input shaft through a driving cam disc, a plurality of circumferential grooves which are matched with each other are formed in the end faces of the driving cam disc and the driving fixed conical disc, the two grooves are matched to form a cavity, and a ball body is placed into the cavity. The groove is of a structure with a wide middle part and narrow two ends, and the driving cam disc can drive the driving fixed cone disc to rotate through the groove and the ball body. The buffer mechanism can be arranged on the active cam disc and/or the active fixed cone disc. The driven fixed cone disc is in transmission connection with the output end of the output shaft through a driven cam disc, and the same transmission structure of the driven fixed cone disc and the driven cam disc is consistent with the transmission structure of the driving fixed cone disc and the driving cam disc. The buffer mechanism can also be arranged on the driven fixed cone disc and/or the driven cam disc.

In the present embodiment, the buffer mechanism is selected to be provided on the input member. A structure is now provided for disposing a damping mechanism on the active cam plate, see fig. 1 and 2:

the buffer component comprises a base 1, and the base and the input shaft are fixedly connected or integrally arranged through a spline. The base is provided with an inner hole and is fixedly connected with the input shaft through a spline, a bottom plate 11 is arranged on one side face of the base, and a plurality of groups of spring limiting blocks 12 of elastic buffering sections are arranged on the bottom plate along the circumferential direction. Each group of elastic buffer sections is provided with two spring limiting blocks, and a circumferential gap is arranged between every two adjacent groups of elastic buffer sections and used for arranging a rigid driving section. The active cam disc 2 is provided with an inner ring, and the active cam disc is sleeved outside the spring limiting block of the base. The inner ring of the active cam disc extends inwards to form a spring mounting block 21 and a driving block 22, wherein the spring mounting block is positioned between two spring limiting blocks of the same group of elastic buffering sections, and the driving block is positioned between the elastic limiting blocks of two adjacent groups of elastic buffering sections. And a pressure spring is arranged between the spring limiting block and the spring mounting block, one end of the pressure spring abuts against the end face of the spring limiting block, and the other end of the pressure spring abuts against the end face of the spring mounting block. And a circumferential gap H is arranged between the driving block and the spring mounting block.

A set of complete elastic buffering sections are formed among the spring limiting blocks, the spring mounting blocks and the pressure springs, and the driving blocks and the gaps H between the two sets of elastic buffering sections form rigid driving sections. The elastic buffer sections in the embodiment are three groups arranged circumferentially, and the rigid driving sections are also three groups arranged circumferentially.

In addition, in this embodiment, the spring mounting block and the end face of the spring limiting block on which the spring is mounted are provided with a spring mounting seat 3. And the bottom plate of the base realizes the axial spacing to one side surface of the pressure spring, and the other side of the pressure spring can be provided with a dust cover 4 to realize the spacing to the other side of the pressure spring and simultaneously prevent dust from entering the buffer mechanism of the embodiment.

In addition, as one of the embodiments in this embodiment, the buffering mechanism may also be disposed on the transmission gear in a manner consistent with that of the cam plate, see fig. 3. Alternatively, the damping mechanism may be provided on a spline.

In the above embodiment, the base serves as a driving member, and the driving cam plate or the transmission gear serves as a driven member. The base is driven by an input shaft. When the torque borne by the base is in a small torque state, the torque is completely transmitted through the compression spring, and when the torque exceeds a set value (determined by a spring force value), the spring buffer is changed into direct contact to transmit large torque. And the base and the cam plate or the transmission gear have a clearance H when not in working state, and the spring force value or the clearance H can be adjusted by calculation and matching; to provide the necessary travel required for the spring to transmit torque. Two groups of springs of the elastic buffer section are symmetrically arranged, and all requirements of reversing and forward blocking of the whole vehicle can be met.

As another embodiment of this embodiment, the buffering mechanism is optionally disposed on the active fixed cone disk of the input member, see fig. 4-7. The concrete structure is as follows:

decide the awl dish 6 including the initiative to and the cover is established carousel 7 on the initiative is decided the awl dish, be provided with a plurality of recesses 71 of circumference on the side of carousel, the recess with the recess phase-match that initiative cam disc side set up, the recess cooperation formation of relative carousel and cam disc holds the chamber it has the spheroid to put into in the chamber to hold.

The driven fixed cone disc is provided with an annular cavity 61 for accommodating the rotating disc, and the inner peripheral wall of the annular cavity extends outwards to form a spring limiting block 62 provided with a plurality of groups of elastic buffering sections. Each group of elastic buffer sections is provided with two spring limiting blocks, and a circumferential gap is arranged between every two adjacent groups of elastic buffer sections and used for arranging a rigid driving section. The rotatable disk is disposed within the annular cavity and has an inner race with a spring mounting block 72 and a drive block 73 extending inwardly therefrom. The spring mounting block is positioned between two spring limiting blocks of the same group of elastic buffering sections, and the driving block is positioned between the elastic limiting blocks of two adjacent groups of elastic buffering sections. And a pressure spring 8 is arranged between the spring limiting block and the spring mounting block, one end of the pressure spring is abutted against the end face of the spring limiting block, and the other end of the pressure spring is abutted against the end face of the spring mounting block. And a circumferential gap H is arranged between the driving block and the spring mounting block.

In addition, in this embodiment, the spring mounting block and the end face of the spring limiting block on which the spring is mounted are provided with a spring mounting seat 3. And the bottom surface of the annular cavity realizes axial limiting on one side surface of the pressure spring, and the other side of the pressure spring can be provided with a dust cover 4 to realize limiting on the other side of the pressure spring and simultaneously prevent dust from entering the buffer mechanism of the embodiment.

In the above embodiment, the rotating disc serves as a driving member, and the driving fixed cone disc serves as a driven member. The rotating disc is driven by an active cam disc. When the torque applied to the rotating disc is in a small torque state, the torque is completely transmitted through the compression spring, and when the torque exceeds a set value (determined by a spring force value), the spring buffer is changed into direct contact to transmit large torque. And the rotating disc and the active fixed cone disc have a clearance H when not in working state, and the spring force value or the clearance H can be adjusted by calculation and matching; to provide the necessary travel required for the spring to transmit torque. Two groups of springs of the elastic buffer section are symmetrically arranged, and all requirements of reversing and forward blocking of the whole vehicle can be met.

In addition, the practical buffer mechanism is designed to be embedded into a transmission part of the continuously variable transmission, so that the buffer mechanism does not occupy extra space at all and is convenient to arrange. The buffer mechanism and the stepless speed changer can also effectively solve the problem of jitter in the variable working condition running process of the existing whole vehicle; the rigidity of a transmission system is reduced, and the torsional damping is improved.

As another embodiment in this embodiment, the CVT in this embodiment may adopt the structure of patent CN 201910567280.7.

Claims

1. The utility model provides a continuously variable transmission's buffer gear, includes the drive assembly who is located the gearbox box, drive assembly includes driving part and follower, its characterized in that: the transmission assembly is provided with a buffer mechanism, the buffer mechanism comprises an elastic buffer section and a rigid driving section which are arranged at intervals along the circumferential direction, and a gap is formed between the elastic buffer section and the rigid driving end.

2. The cushioning mechanism of claim 1, wherein: the elastic buffer section and the rigid driving section are respectively provided with a plurality of elastic buffer sections and rigid driving sections.

3. The cushioning mechanism of claim 2, wherein: the elastic buffering section comprises spring limiting blocks arranged at two ends and a spring mounting block positioned between the two spring limiting blocks, two sides of the spring mounting block form spring mounting cavities with the spring mounting blocks at the two ends respectively, springs are arranged in the spring mounting cavities, one ends of the springs are abutted to the spring mounting blocks, the other ends of the springs are abutted to the spring limiting blocks, the spring limiting blocks are fixedly connected with or integrally arranged with the driving part, and the spring mounting blocks are fixedly connected with or integrally arranged with the driven part.

4. A damper mechanism according to claim 3, wherein: be provided with between two adjacent spring buffer sections the rigid drive section, the rigid drive section is a driving block, the driving block with follower fixed connection or integrative the setting, just driving block both ends have circumferential clearance H with the spring stopper respectively.

5. The cushioning mechanism of claim 4, wherein: the gap H is:

wherein N-set conversion torque

i-number of spring groups, two symmetrically arranged springs being one group

Coefficient of elasticity of k-spring

R-spring placement centerline radius.

6. The cushioning mechanism of claim 1, 2, 3, 4, or 5, wherein: the transmission assembly comprises a cam disc, a conical disc, a transmission gear or a spline, the opposite surfaces of the cam disc and the conical disc are respectively provided with a matched groove, a ball is arranged in the groove, and the buffer mechanism is arranged on the cam disc, the conical disc, the transmission gear or the spline.

7. The cushioning mechanism of claim 6, wherein: buffer gear sets up on cam disc or the drive gear, including the base as the driving part and the cam disc or the drive gear as the follower, be provided with a plurality of spring stopper on the base and be in same side of spring stopper be provided with the integrative bottom surface of base be provided with spring installation piece and drive block on the cam disc or the drive gear settle between spring stopper and the spring installation piece the spring, clearance H has between the spring stopper of drive block and both sides.

8. The cushioning mechanism of claim 6, wherein: the buffer mechanism is arranged on the conical disc and comprises a rotating disc serving as a driving part and provided with a groove and a conical disc serving as a driven part, wherein an inner ring of the rotating disc is provided with an inward protruding spring limiting block, the inner ring of the conical disc is provided with an outward protruding spring mounting block and a driving block, the spring mounting block and the driving block are matched with the spring limiting block, and a gap H is formed between the driving block and the spring blocks on two sides.

9. The damper mechanism according to claim 7 or 8, wherein: and the dustproof cover is also arranged and seals the exposed surface of the buffer mechanism.

10. A continuously variable transmission characterized in that: a damper mechanism according to any preceding claim.