阅读说明：本技术 一种缓冲联轴器 (Buffer coupling ) 是由 钱雪松 于 2019-11-08 设计创作，主要内容包括：本发明公开了一种缓冲联轴器,包括主动轴、中间轴、中间轴套、圆柱弹簧、螺钉、从动轴花键套以及从动轴；本发明的圆柱弹簧在原始位置进行预压缩,用于平衡机构的额度传动力矩,当受到冲击力矩作用时,圆柱弹簧进一步压缩,产生轴向位移,对应于周向旋转运动,使得从动轴和主动轴之间产生转速差,延长冲击力矩的传递时间,降低冲击力矩的峰值,有效保护传动轴及传动系统中各零部件的安全。(The invention discloses a buffer coupling, which comprises a driving shaft, an intermediate shaft sleeve, a cylindrical spring, a screw, a driven shaft spline sleeve and a driven shaft, wherein the intermediate shaft is fixedly connected with the driving shaft; the cylindrical spring is precompressed at the original position and used for balancing the limit transmission torque of the mechanism, when the cylindrical spring is acted by the impact torque, the cylindrical spring is further compressed to generate axial displacement, and corresponding to circumferential rotation motion, a rotation speed difference is generated between the driven shaft and the driving shaft, the transmission time of the impact torque is prolonged, the peak value of the impact torque is reduced, and the safety of the transmission shaft and each part in a transmission system is effectively protected.)

1. A buffer coupling is characterized by comprising a driving shaft (1), an intermediate shaft (2), an intermediate shaft sleeve (3), a cylindrical spring (4), a screw (5), a driven shaft spline sleeve (6) and a driven shaft (7);

a spline is processed on the outer surface of a cylinder at the left end of the driving shaft (1) to form a driving shaft spline shaft (1-1); the middle shaft (2) comprises a middle shaft first shaft platform (2-1), a middle shaft second shaft platform (2-3), a middle shaft third shaft platform (2-5) and a cylindrical spring guide post (2-6); spline grooves are processed in the first pillow block (2-1) of the intermediate shaft to form an intermediate shaft internal spline (2-2), the driving shaft spline shaft (1-1) is inserted into the intermediate shaft internal spline (2-2) and forms sliding fit, and the intermediate shaft (2) axially moves relative to the driving shaft (1); the right end of the intermediate shaft second shaft platform (2-3) is connected with the intermediate shaft first shaft platform (2-1), the left end of the intermediate shaft second shaft platform is connected with the right end of the intermediate shaft third shaft platform (2-5), and a multi-head spiral line is processed on the circumferential outer surface of the intermediate shaft second shaft platform (2-3) to form an intermediate shaft spiral line (2-4); the left end of the third pillow block (2-5) of the middle shaft is connected with the right end of the cylindrical spring guide post (2-6);

the inner side of the right side of the middle shaft sleeve (3) is processed with a multi-start helical line to form a helical line (3-1) in the middle shaft sleeve, the helical line (3-1) in the middle shaft sleeve and the helical line (2-4) of the middle shaft sleeve are mutually screwed to form thread transmission, and the helical line (2-4) of the middle shaft realizes axial movement while forming rotation in the helical line (3-1) in the middle shaft sleeve;

a spline is processed on the outer surface of a right-end cylinder of the driven shaft (7) to form a driven shaft spline shaft (7-1);

the driven shaft spline housing (6) comprises a driven shaft spline housing first shaft platform (6-1), a driven shaft spline housing second shaft platform (6-3) and a driven shaft spline housing third shaft platform (6-4); a cylindrical hole is processed in the right end of the driven shaft spline housing first boss (6-1) to form a cylindrical spring seat (6-2), and a cylindrical spring guide post (2-6) can be inserted into the cylindrical spring seat (6-2); the driven shaft spline housing first boss (6-1) is inserted into the inner hole at the left end of the middle shaft sleeve (3), and the circumferential outer surface of the driven shaft spline housing first boss (6-1) is matched with the inner hole at the left end of the middle shaft sleeve (3); the driven shaft spline housing second shaft platform (6-3) forms an installation flange of the driven shaft spline housing (6), the driven shaft spline housing second shaft platform (6-3) and the middle shaft sleeve (3) are reliably connected through a screw (5), and a driven shaft spline housing internal spline (6-5) is machined inside the driven shaft spline housing third shaft platform (6-4); the driven shaft spline shaft (7-1) and the driven shaft spline sleeve internal spline (6-5) are tightly and reliably connected;

the cylindrical spring (4) is sleeved on the cylindrical spring guide post (2-6), the left end of the cylindrical spring is abutted against the cylindrical spring seat (6-2), and the right end of the cylindrical spring is abutted against the third pillow block (2-5) of the intermediate shaft.

2. A cushioned coupling as set forth in claim 1 wherein: the cylindrical spring (4) can be replaced by a belleville spring.

Technical Field

The invention relates to a buffering coupler, and belongs to the technical field of machinery.

Background

The coupling belongs to a mechanical universal part and is a mechanical part which is used for connecting a driving shaft and a driven shaft in different mechanisms and enabling the driving shaft and the driven shaft to rotate together to transmit torque. The existing coupling rigidly connects the driving shaft and the driven shaft, but when the driving shaft is started, the driving shaft can generate impact load due to the action of inertia load of the driven part connected with the driven shaft, so that a large impact moment is formed, and in addition, when the driven part connected with the driven shaft is subjected to the action of the impact load, the rigid connection between the driving shaft and the driven shaft can also form a large impact moment. Easily causing damage to the coupling or related transmission components.

Disclosure of Invention

In order to overcome the defects, the invention provides a buffer coupling, which adopts the technical scheme as follows:

a buffer coupling comprises a driving shaft, an intermediate shaft sleeve, a cylindrical spring, a screw, a driven shaft spline sleeve and a driven shaft;

a spline is processed on the outer surface of the left end cylinder of the driving shaft to form a driving shaft spline shaft; the middle shaft comprises a middle shaft first shaft table, a middle shaft second shaft table, a middle shaft third shaft table and a cylindrical spring guide post; spline grooves are processed in the first shaft platform of the intermediate shaft to form an internal spline of the intermediate shaft, the spline shaft of the driving shaft is inserted into the internal spline of the intermediate shaft to form sliding fit, and the intermediate shaft moves axially relative to the driving shaft; the right end of the intermediate shaft second shaft platform is connected with the intermediate shaft first shaft platform, the left end of the intermediate shaft second shaft platform is connected with the right end of the intermediate shaft third shaft platform, and a multi-head spiral line is processed on the circumferential outer surface of the intermediate shaft second shaft platform to form an intermediate shaft spiral line; the left end of the third pillow block of the intermediate shaft is connected with the right end of the cylindrical spring guide post;

the inner side of the right side of the middle shaft sleeve is provided with a multi-start helical line to form a helical line in the middle shaft sleeve, the helical line in the middle shaft sleeve and the helical line of the middle shaft are mutually screwed to form thread transmission, and the helical line of the middle shaft realizes axial movement while forming rotation in the helical line in the middle shaft sleeve;

a spline is processed on the outer surface of a right-end cylinder of the driven shaft to form a driven shaft spline shaft; the driven shaft spline housing comprises a driven shaft spline housing first shaft platform, a driven shaft spline housing second shaft platform and a driven shaft spline housing third shaft platform; a cylindrical hole is formed in the inner part of the right end of the spline housing first boss of the driven shaft to form a cylindrical spring seat, and a cylindrical spring guide post can be inserted into the cylindrical spring seat; the driven shaft spline housing first boss is inserted into the inner hole at the left end of the middle shaft sleeve, and the circumferential outer surface of the driven shaft spline housing first boss is matched with the inner hole at the left end of the middle shaft sleeve; the driven shaft spline housing second shaft platform forms an installation flange of a driven shaft spline housing, the driven shaft spline housing second shaft platform and the middle shaft sleeve form reliable connection through screws, and a driven shaft spline housing internal spline is processed inside the driven shaft spline housing third shaft platform; the driven shaft spline shaft and the driven shaft spline sleeve internal spline are in tight and reliable connection;

the cylindrical spring is sleeved on the cylindrical spring guide column, the left end of the cylindrical spring abuts against the cylindrical spring seat, and the right end of the cylindrical spring abuts against the third pillow block of the middle shaft.

The cylindrical spring may be a belleville spring.

The invention achieves the following beneficial effects:

the cylindrical spring of the invention is pre-compressed in the initial position for balancing the nominal torque of the damping coupling. In the starting process of the driving shaft, due to the effect of inertia load of a driven part connected with the driven shaft, the driving shaft can form a starting torque far larger than the rated torque of the buffer coupling, the driving shaft drives the intermediate shaft to rotate through the driving shaft spline shaft and the intermediate shaft internal spline, the screwing transmission is generated between the internal spiral line of the intermediate shaft sleeve and the intermediate shaft spiral line, an axial compression force larger than the pre-compression force of the cylindrical spring is formed, the intermediate shaft further compresses the cylindrical spring through the left end step of the intermediate shaft third shaft platform, meanwhile, the intermediate shaft generates axial movement towards the left of the driving shaft through the sliding fit formed between the intermediate shaft internal spline and the driving shaft spline shaft, at the moment, the compression force borne by the cylindrical spring is balanced with the axial force formed by the screwing between the internal spiral line of the intermediate shaft sleeve and the intermediate shaft spiral line, in the process, due to the screwing, axial displacement is generated, corresponding to circumferential rotation motion, so that a rotation speed difference is generated between the driven shaft and the driving shaft, the transmission time of impact torque is prolonged, the peak value of starting torque is reduced, and the safety of the transmission shaft and each part in a transmission system is effectively protected; when the driven shaft and the driven part connected with the driven shaft are driven by the driving shaft, the rotating speed is gradually improved, the inertia moment is gradually reduced, the working torque of the buffer coupling is also gradually reduced, the intermediate shaft generates relative rotation between the spiral line in the intermediate shaft sleeve and the spiral line of the intermediate shaft under the action of the axial compression force of the cylindrical spring, meanwhile, the intermediate shaft generates axial movement towards the right side relative to the driving shaft through the sliding fit formed between the internal spline of the intermediate shaft and the spline shaft of the driving shaft, the right end step of the third shaft platform of the intermediate shaft gradually approaches to the left side of the inner side of the right end of the intermediate shaft sleeve, and at the moment, the axial compression force borne by the cylindrical spring and the axial force formed by the screwing between; when the working torque of the buffer coupling is equal to or smaller than the rated torque, the right end step of the third pillow block of the intermediate shaft gradually abuts against the left side of the inner side of the right end of the intermediate shaft sleeve, and at the moment, the axial compression force applied to the cylindrical spring is equal to the original pre-compression force; when the driven part connected with the driven shaft is acted by impact torque and the impact torque is larger than the rated torque of the buffer coupling, the driven shaft and the driven part connected with the driven shaft drive the middle shaft sleeve to slow down the rotation speed through the driven shaft spline shaft and the driven shaft spline sleeve inner spline, the screwing transmission is generated between the middle shaft sleeve inner spiral line and the middle shaft spiral line to form axial compression force larger than the pre-compression force of the cylindrical spring, the middle shaft further compresses the cylindrical spring through the left end step of the middle shaft third shaft platform, meanwhile, the middle shaft generates axial movement towards the left of the driving shaft through the sliding fit formed between the middle shaft inner spline and the driving shaft spline shaft, at the moment, the compression force applied to the cylindrical spring and the impact torque applied to the driven shaft are balanced through the axial force formed by the screwing between the middle shaft sleeve inner spiral line, because the spiral-connection transmission generated between the inner spiral line of the intermediate shaft sleeve and the spiral line of the intermediate shaft generates axial displacement, corresponding to circumferential rotation motion, the rotating speed difference is generated between the driven shaft and the driving shaft, the transmission time of the impact torque is prolonged, the peak value of the impact torque is reduced, and the safety of each part in the transmission shaft and the transmission system is effectively protected.

Drawings

Fig. 1 is a schematic structural view of the present invention.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1, a buffer coupling comprises a driving shaft 1, an intermediate shaft 2, an intermediate shaft sleeve 3, a cylindrical spring 4, a screw 5, a driven shaft spline sleeve 6 and a driven shaft 7;

a spline is processed on the outer surface of a cylinder at the left end of the driving shaft 1 to form a driving shaft spline shaft 1-1; the middle shaft 2 comprises a middle shaft first shaft table 2-1, a middle shaft second shaft table 2-3, a middle shaft third shaft table 2-5 and cylindrical spring guide columns 2-6; spline grooves are processed in the first pillow block 2-1 of the intermediate shaft to form an internal spline 2-2 of the intermediate shaft, the spline shaft 1-1 of the driving shaft is inserted into the internal spline 2-2 of the intermediate shaft and forms sliding fit, and the intermediate shaft 2 axially moves relative to the driving shaft 1; the right end of the intermediate shaft second shaft platform 2-3 is connected with the right end of an intermediate shaft first shaft platform 2-1, the left end of the intermediate shaft second shaft platform is connected with the right end of an intermediate shaft third shaft platform 2-5, and a multi-head spiral line is processed on the circumferential outer surface of the intermediate shaft second shaft platform 2-3 to form an intermediate shaft spiral line 2-4; the left end of the middle shaft third shaft platform 2-5 is connected with the right end of the cylindrical spring guide post 2-6;

a multi-start spiral line is processed on the inner side of the right side of the middle shaft sleeve 3 to form a middle shaft sleeve inner spiral line 3-1, the middle shaft sleeve inner spiral line 3-1 and the middle shaft spiral line 2-4 are mutually screwed to form thread transmission, and the middle shaft spiral line 2-4 rotates in the middle shaft sleeve inner spiral line 3-1 and simultaneously realizes axial movement;

a spline is processed on the outer surface of a right-end cylinder of the driven shaft 7 to form a driven shaft spline shaft 7-1; the driven shaft spline housing 6 comprises a driven shaft spline housing first shaft platform 6-1, a driven shaft spline housing second shaft platform 6-3 and a driven shaft spline housing third shaft platform 6-4; a cylindrical hole is processed in the right end of the driven shaft spline housing first boss 6-1 to form a cylindrical spring seat 6-2, and a cylindrical spring guide post 2-6 can be inserted into the cylindrical spring seat 6-2; the driven shaft spline housing first boss 6-1 is inserted into the inner hole at the left end of the middle shaft sleeve 3, and the circumferential outer surface of the driven shaft spline housing first boss 6-1 is matched with the inner hole at the left end of the middle shaft sleeve 3; the driven shaft spline housing second shaft platform 6-3 forms an installation flange of the driven shaft spline housing 6, the driven shaft spline housing second shaft platform 6-3 and the middle shaft sleeve 3 are reliably connected through a screw 5, and a driven shaft spline housing internal spline 6-5 is machined inside the driven shaft spline housing third shaft platform 6-4; the driven shaft spline shaft 7-1 and the driven shaft spline sleeve internal spline 6-5 are in tight and reliable connection;

the cylindrical spring 4 is sleeved on the cylindrical spring guide post 2-6, the left end of the cylindrical spring is abutted against the cylindrical spring seat 6-2, and the right end of the cylindrical spring is abutted against the third pillow block 2-5 of the middle shaft.

The cylindrical spring 4 may be a belleville spring.

The cylinder spring 4 of the invention is pre-compressed in the initial position for balancing the nominal torque of the damping coupling. In the starting process of the driving shaft 1, due to the effect of inertia load of a driven part connected with a driven shaft 7, the driving shaft 1 can form starting torque far larger than rated torque of a buffer coupling, the driving shaft 1 drives an intermediate shaft to rotate through a driving shaft spline shaft 1-1 and an intermediate shaft internal spline 2-2, screwing transmission is generated between a spiral line 3-1 in an intermediate shaft sleeve and an intermediate shaft spiral line 2-4 to form axial compression force larger than precompression force of a cylindrical spring 4, the intermediate shaft 2 further compresses the cylindrical spring 4 through a left end step of an intermediate shaft third shaft platform 2-5, meanwhile, the intermediate shaft 2 generates axial movement towards the left relative to the driving shaft 1 through sliding fit formed between the intermediate shaft internal spline 2-2 and the driving shaft spline shaft 1-1, and at the moment, the compression force borne by the cylindrical spring 4 and the starting torque of the driving shaft 1 are axially moved towards the left relative 4, axial forces formed by screwing are balanced, in the process, due to screwing transmission generated between the spiral line 3-1 in the middle shaft sleeve and the spiral line 2-4 of the middle shaft, axial displacement is generated, corresponding to circumferential rotation motion, a rotation speed difference is generated between the driven shaft 7 and the driving shaft 1, the transmission time of impact torque is prolonged, the peak value of starting torque is reduced, and the safety of the transmission shaft and each part in a transmission system is effectively protected; when the driven shaft 7 and the driven part connected with the driven shaft are driven by the driving shaft 1, the rotating speed is gradually increased, the inertia moment is gradually reduced, the working moment of the buffer coupling is also gradually reduced, the middle shaft 2 generates relative rotation between the spiral line 3-1 in the middle shaft sleeve and the spiral line 2-4 of the middle shaft under the action of the axial compression force of the cylindrical spring 4, meanwhile, the intermediate shaft 2 generates rightward axial movement relative to the driving shaft 1 through sliding fit formed between the intermediate shaft internal spline 2-2 and the driving shaft spline shaft 1-1, a right end step of an intermediate shaft third shaft platform 2-5 gradually approaches to the left side of the inner side of the right end of the intermediate shaft 2 sleeve, and at the moment, axial compression force borne by the cylindrical spring 4 is balanced with axial force formed by screwing between a working torque of the driving shaft 1 and an intermediate shaft spiral line 3-1 in the intermediate shaft sleeve and an intermediate shaft spiral line 2-4; when the working torque of the buffer coupling is equal to or less than the rated torque, the right end steps of the third middle shaft table 2-5 gradually abut against the left side of the inner side of the right end of the middle shaft sleeve 3, and at the moment, the axial compression force applied to the cylindrical spring 4 is equal to the original pre-compression force; when the driven part connected with the driven shaft 7 is subjected to the action of impact torque and the impact torque is larger than the rated torque of the buffer coupling, the driven shaft 7 and the driven part connected with the driven shaft drive the middle shaft sleeve 3 to reduce the rotating speed through the driven shaft spline shaft 7-1 and the driven shaft spline sleeve 6 inner spline, the screwing transmission is generated between the middle shaft sleeve inner spiral line 3-1 and the middle shaft spiral line 2-4 to form axial compression force larger than the pre-compression force of the cylindrical spring 4, the middle shaft 2 further compresses the cylindrical spring 4 through the left end step of the middle shaft third shaft platform 2-5, meanwhile, the middle shaft 2 generates axial movement towards the left relative to the driving shaft 1 through the sliding fit formed between the middle shaft inner spline 2-2 and the spline shaft driving shaft 1-1, at the moment, the compression force received by the cylindrical spring 4 and the impact torque received by the driven shaft 7 are subjected to the middle shaft 4 are balanced, and in the process, because the screwing transmission generated between the spiral line 3-1 in the middle shaft sleeve and the spiral line 2-4 of the middle shaft sleeve generates axial displacement, corresponding to circumferential rotation motion, the rotating speed difference is generated between the driven shaft 7 and the driving shaft 1, the transmission time of the impact torque is prolonged, the peak value of the impact torque is reduced, and the safety of each part in the transmission shaft and the transmission system is effectively protected.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.