CN210218386U

CN210218386U - Eccentric transmission mechanism

Info

Publication number: CN210218386U
Application number: CN201920815985.1U
Authority: CN
Inventors: Rongsheng Xie; 谢荣生; Geng Wang; 王耿; Guocheng Ye; 叶国程
Original assignee: SHANTOU MENGXING PACKAGE MACHINERY CO Ltd
Current assignee: SHANTOU MENGXING PACKAGE MACHINERY CO Ltd
Priority date: 2019-06-01
Filing date: 2019-06-01
Publication date: 2020-03-31
Anticipated expiration: 2029-06-01

Abstract

An eccentric transmission mechanism comprises a rotating shaft, an eccentric wheel and a flat key, wherein the eccentric wheel is provided with a first key groove and a shaft hole, the central axis of the shaft hole deviates from the central axis of the eccentric wheel, the rotating shaft is provided with a matching section and a shaft shoulder section, and the diameter of the shaft shoulder section is larger than that of the matching section; a second key groove is formed in the shaft shoulder section; the eccentric wheel passes through the shaft hole and installs on the cooperation section of pivot, and the parallel key inserts in first keyway, the second keyway, and the parallel key is connected with eccentric wheel fixed connection, and distance A of parallel key bottom to pivot the central axis is greater than the radius R of cooperation section. Through setting up the pivot including adjacent cooperation section and shaft shoulder section to the diameter of shaft shoulder section is greater than the diameter of cooperation section, then sets up the second keyway in the shaft shoulder section, installs the eccentric wheel in the cooperation section, avoids destroying the integrality of pivot, thereby makes the complex reliability increase substantially between eccentric wheel and the pivot, and stress distribution is more even in the pivot, avoids tired and leads to breaking increase of service life.

Description

Eccentric transmission mechanism

Technical Field

The utility model relates to a drive mechanism especially relates to an eccentric drive mechanism.

Background

The eccentric transmission mechanism generally includes an eccentric wheel and a rotating shaft, the eccentric wheel is mounted on the rotating shaft, the rotating shaft deviates from the center of the eccentric wheel, and the eccentric transmission mechanism is widely used as a common mechanical component and is widely applied to periodic reciprocating drive.

At present, in order to fixedly mount an eccentric wheel on a rotating shaft to transmit torque of the rotating shaft and limit relative rotation of the eccentric wheel and the rotating shaft, an eccentric transmission mechanism is generally provided with a first key groove on the eccentric wheel, a second key groove on the rotating shaft, the eccentric wheel is mounted on the rotating shaft, and a flat key is inserted into the first key groove and the second key groove, so that the eccentric wheel and the rotating shaft cannot rotate relatively.

However, since the eccentric wheel and the rotating shaft are both provided with the key slots, the integrity of the rotating shaft is damaged, the reliability of matching between the eccentric wheel and the rotating shaft is greatly reduced, and the stress distribution on the rotating shaft is seriously uneven due to the existence of the second key slot on the rotating shaft, so that the rotating shaft is easy to generate fatigue and break.

In addition, when the same rotating shaft is used for driving two or more eccentric wheels to perform eccentric transmission, a plurality of key grooves need to be processed on the rotating shaft respectively, so that the deviation of each key groove is easily caused during processing, and the accurate alignment or the preset accurate phase difference of each eccentric wheel cannot be ensured.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide an eccentric drive mechanism, this kind of eccentric drive mechanism can avoid destroying the integrality of pivot, increases substantially the complex reliability between eccentric wheel and the pivot, makes in the pivot stress distribution more even, increase of service life. The technical scheme is as follows:

the utility model provides an eccentric drive mechanism, includes pivot, at least one eccentric wheel and at least one flat key, has seted up first keyway and at least one shaft hole on the eccentric wheel, the central axis of the skew eccentric wheel in shaft hole, at least one second keyway has been seted up in the pivot, and the eccentric wheel passes through the shaft hole and installs in the pivot, and the flat key inserts first keyway, second keyway, flat key and eccentric wheel fixed connection, characterized by: the rotating shaft is provided with a matching section and a shaft shoulder section, the shaft shoulder section and the matching section are arranged adjacently, and the diameter of the shaft shoulder section is larger than that of the matching section; the second key groove is formed in the shaft shoulder section; after the flat key is inserted into the first key groove and the second key groove, the distance A from the bottom of the flat key to the central axis of the rotating shaft is larger than the radius R of the matching section; the eccentric wheel is installed on the matching section.

As the preferred scheme of the utility model, the distance B of second keyway bottom to pivot the central axis is more than or equal to the radius R of cooperation section, and A > B ≧ R.

As a further preferred scheme of the utility model, the quantity of eccentric wheel, flat key is two, be equipped with two cooperation sections in the pivot, two cooperation sections set up respectively the both sides of shaft shoulder section, two eccentric wheels are installed respectively in corresponding cooperation section.

As a preferable aspect of the present invention, the first key groove extends in a radial direction of the shaft hole and passes through a central axis of the eccentric wheel.

As the utility model discloses a preferred scheme, be equipped with the through-hole on the flat key, be equipped with the screw on the first keyway of eccentric wheel, the flat key passes through screw, through-hole, screw locking on the eccentric wheel.

Compared with the prior art, the utility model, have following advantage:

through setting up the pivot including adjacent cooperation section and shaft shoulder section to the diameter of shaft shoulder section is greater than the diameter of cooperation section, then sets up the second keyway in the shaft shoulder section, installs the eccentric wheel in the cooperation section, avoids destroying the integrality of pivot, thereby makes the complex reliability increase substantially between eccentric wheel and the pivot, and stress distribution is more even in the pivot, avoids tired and leads to breaking increase of service life.

Drawings

Fig. 1 is a schematic perspective view of a preferred embodiment of the present invention;

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a schematic view of the structure of the rotating shaft;

fig. 5 is a cross-sectional view taken along B-B of fig. 4.

Detailed Description

The following further describes the preferred embodiments of the present invention with reference to the accompanying drawings.

As shown in fig. 1-5, the eccentric transmission mechanism includes a rotating shaft 1, two eccentric wheels 2 and two flat keys 3, each eccentric wheel 2 is provided with a first key slot 4 and a shaft hole 5, the central axis of the shaft hole 5 deviates from the central axis of the eccentric wheel 2, and the first key slot 4 extends along the radial direction of the shaft hole 5 and passes through the central axis of the eccentric wheel 2; the rotating shaft 1 is provided with a shaft shoulder section 6 and two matching sections 7, the two matching sections 7 are respectively arranged at two sides of the shaft shoulder section 6 and are adjacent to the shaft shoulder section 6, and the diameter of the shaft shoulder section 6 is larger than that of the matching sections 7; a second key groove 8 is formed in a shaft shoulder section 6 of the rotating shaft 1, the two eccentric wheels 2 are installed on corresponding matching sections 7 of the rotating shaft 1 through shaft holes 5, the flat key 3 is inserted into the first key groove 4 and the second key groove 8, a through hole is formed in the flat key 3, a screw hole is formed in the first key groove 4 of each eccentric wheel 2, and the flat key is locked on the eccentric wheels 2 through a screw 9, the through hole and the screw hole; the distance A from the bottom of the flat key 3 to the central axis of the rotating shaft 1 is greater than the radius R of the matching section 7, the distance B from the bottom of the second key groove 8 to the central axis of the rotating shaft 1 is greater than or equal to the radius R of the matching section 7, and A is greater than B and is not less than R.

The eccentric wheel 2 is arranged on the matching section 7 and can adopt an interference mounting mode, namely, the diameter of the shaft hole 5 of the eccentric wheel 2 is slightly smaller than that of the rotating shaft 1, then the eccentric wheel 2 is heated to enable the eccentric wheel 2 to expand and then is sleeved outside the rotating shaft 1 through the shaft hole 5, and when the eccentric wheel 2 is cooled, the eccentric wheel 2 is tightly sleeved on the rotating shaft 1.

The rotating shaft 1 is provided with the matching section 7 and the shoulder section 6 which are adjacent, the diameter of the shoulder section 6 is larger than that of the matching section 7, the second key groove 8 is arranged on the shoulder section 6, and the eccentric wheel 2 is arranged on the matching section 7, so that the shoulder section 6 is more prominent than the matching section 7 due to the larger diameter of the shoulder section 6, the second key groove 8 is arranged on the shoulder section 6 to avoid damaging the integrity of the rotating shaft 1, the distance A from the bottom of the flat key 3 to the central axis of the rotating shaft 1 is set to be larger than the radius R of the matching section 7, the flat key 3 is ensured not to protrude into the range of the shaft hole 5, a notch for accommodating the bottom of the flat key 3 is not required to be arranged on the matching section 7, the integrity of the rotating shaft 1 is further avoided to be damaged, the reliability of matching between the eccentric wheel 2 and the rotating shaft 1 is greatly improved, the stress distribution on the rotating shaft 1 is more uniform, and the, the service life is prolonged; the distance B from the bottom of the second key groove 8 to the central axis of the rotating shaft 1 is set to be larger than or equal to the radius R of the matching section 7, and A is larger than B and is larger than or equal to R, so that on the basis of ensuring that the second key groove 8 penetrates through the shaft shoulder section 6 once, the mutual interference which may occur when the eccentric wheel 2 is installed is further avoided; in addition, when two eccentrics 2 are provided, the second key groove 8 is also formed in the shoulder section 6 once through both ends of the shoulder section 6, and when the first key groove 4 of the second eccentric 2 is machined, the first key grooves 4 of the two eccentrics 2 are staggered by a required angle in advance, so that the phase difference between the two eccentrics 2 is preset.

The first key groove 4 is arranged to extend in the radial direction of the shaft hole 5 and pass through the central axis of the eccentric wheel 2, the first key groove 4 can be machined simultaneously when the shaft hole 5 is machined, and the alignment deviation caused by multiple times of clamping is avoided.

In addition, it should be noted that the names of the parts and the like of the embodiments described in the present specification may be different, and all the equivalent or simple changes made according to the structure, the features and the principle of the present invention are included in the protection scope of the present invention. Various modifications, additions and substitutions may be made by those skilled in the art without departing from the scope of the invention as defined in the accompanying claims.

Claims

1. The utility model provides an eccentric drive mechanism, includes pivot, at least one eccentric wheel and at least one flat key, has seted up first keyway and at least one shaft hole on the eccentric wheel, the central axis of the skew eccentric wheel in shaft hole, at least one second keyway has been seted up in the pivot, and the eccentric wheel passes through the shaft hole and installs in the pivot, and the flat key inserts first keyway, second keyway, flat key and eccentric wheel fixed connection, characterized by: the rotating shaft is provided with a matching section and a shaft shoulder section, the shaft shoulder section and the matching section are arranged adjacently, and the diameter of the shaft shoulder section is larger than that of the matching section; the second key groove is formed in the shaft shoulder section; after the flat key is inserted into the first key groove and the second key groove, the distance A from the bottom of the flat key to the central axis of the rotating shaft is larger than the radius R of the matching section; the eccentric wheel is installed on the matching section.

2. The eccentric drive mechanism of claim 1, wherein: the distance B from the bottom of the second key groove to the central axis of the rotating shaft is greater than or equal to the radius R of the matching section, and A is greater than B and is greater than or equal to R.

3. An eccentric transmission mechanism as claimed in claim 1 or 2, characterized in that: the quantity of eccentric wheel, flat key is two, be equipped with two cooperation sections in the pivot, two cooperation sections set up respectively the both sides of shaft shoulder section, two eccentric wheels are installed respectively on corresponding cooperation section.

4. The eccentric drive mechanism of claim 1, wherein: the first key groove extends along the radial direction of the shaft hole and passes through the central axis of the eccentric wheel.

5. The eccentric drive mechanism of claim 1, wherein: the flat key is provided with a through hole, the first key groove of the eccentric wheel is provided with a screw hole, and the flat key is locked on the eccentric wheel through the screw, the through hole and the screw hole.