阅读说明：本技术 一种无级变速器及其缓冲机构 (Continuously variable transmission and buffer mechanism thereof ) 是由 伍立伟 黄敏 于 2019-10-31 设计创作，主要内容包括：本发明公开了一种无级变速器及其缓冲机构,包括位于变速器箱体内的传动组件,所述传动组件包括主动件和从动件,其特征在于：在所述传动组件上设置有缓冲机构,所述缓冲机构包括沿周向间隔设置的弹性缓冲段和刚性驱动段且所述弹性缓冲段和刚性驱动端之间具有间隙。本发明的缓冲机构传递动力无缝联接,基本无效率损失。缓冲机构及无级变速器还可有效解决现有整车变工况行驶过程中的抖动问题；降低传动系统刚度,提升扭转阻尼。(The invention discloses a continuously variable transmission and a buffer mechanism thereof, which comprise a transmission assembly positioned in a transmission box body, wherein the transmission assembly comprises a driving part and a driven part, and is 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 buffer mechanism of the invention transmits power for seamless connection, and basically has no efficiency loss. 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.)

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.

Technical Field

The present invention relates to a CVT transmission mechanism, and more particularly to a damper mechanism provided in a 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 present invention is to solve the above-mentioned problems of shaking and impact.

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.

Disclosure of Invention

The invention aims to provide a buffer mechanism which enables torque transmission of a continuously variable transmission to be uninterrupted without efficiency loss.

In order to achieve the above object, the present invention is realized by: 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 invention realizes the buffer function by arranging the springs in the circumferential direction, when the input torque is in a small torque state, the torque is completely transmitted through the springs, and when the torque exceeds a set value (determined by the spring force value), the spring buffer is changed into direct contact to transmit large torque.

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 the 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.

In addition, the buffer mechanism and the stepless speed changer can also effectively solve the problem of jitter in the running process of the conventional whole vehicle under variable working conditions; 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 substitutions in the basic spirit of the embodiments will still fall within the scope of the present invention as claimed in the claims.