CN210531533U - Parallel conjugate cam indexing device with unevenly distributed rollers - Google Patents

Abstract

The utility model discloses a parallel conjugate cam indexing means of a graduation that roller is uneven and distributes, including input shaft, output dividing shaft, conjugate cam and bearing, the conjugate cam includes first conjugate cam and second conjugate cam at least, and first conjugate cam and second conjugate cam reciprocal anchorage form disjunctor structure and with the coaxial rotation of input shaft, first conjugate cam and second conjugate cam contain circular arc section and curve section respectively; the output indexing shaft is arranged adjacent to the input shaft, a group of needle roller bearings are respectively arranged on the output indexing shaft corresponding to the first conjugate cam and the second conjugate cam and used for indexing transmission, and each group of needle roller bearings are asymmetrically distributed on the same circumference of the output indexing shaft. The curve of the conjugate cam of the utility model has a completely one-to-one correspondence relationship with the needle bearing on the output shaft; the self-locking reliability of the output indexing shaft during the stop is improved by the arrangement of the needle roller bearings which are distributed unevenly along the circumference.

Description

Parallel conjugate cam indexing device with unevenly distributed rollers

Technical Field

The utility model relates to a transmission machinery technical field, especially a parallel conjugate cam indexing means of a graduation that roller is non-uniform distribution.

Background

The decollator is a mechanism for realizing intermittent motion, has the obvious characteristics of high indexing precision, stable operation, large transmission torque, self locking during positioning, compact structure, small volume, low noise, good high-speed performance, long service life and the like, is an ideal product for replacing the traditional mechanisms such as a sheave mechanism, a ratchet mechanism, an incomplete gear mechanism, a pneumatic control mechanism and the like, and is widely applied to various automatic machines which need to convert continuous motion of bars into stepping motion, such as pharmaceutical machines, automatic material conveying mechanisms of presses, food packaging machines, glass machines, ceramic machines, tobacco machines, filling machines, printing machines, electronic machines, automatic tool changing devices of processing centers and the like. The mechanical structure comprises an input shaft, a cam pair and an output shaft or a flange plate which are driven by a motor. A turntable for mounting loads such as a workpiece and a positioning jig is mounted on the output shaft. Today, the intermittent divider is playing a great role in a wide field in stably realizing forward development of automation. In the existing indexing device for the parallel conjugate cam with one index, an output indexing shaft is positioned on the same distribution circle, and a group of needle bearings which are uniformly distributed are meshed with a group of conjugate cams positioned on an input shaft, so that the rotation and the stop of the output indexing shaft are completed. The smaller the central angle formed by the centers of the two needle roller bearings and the center of the output indexing shaft is, the lower the reliability of the clamping lock is, the circumferential equal distribution structure of the needle roller bearings limits the selection of the central angle, and therefore the reliability of the self-locking of the output shaft of the parallel conjugate cam indexing device is reduced.

Disclosure of Invention

To the above problem, the utility model provides a parallel conjugate cam indexing means of one graduation that roller is uneven equant distribution.

The technical scheme of the utility model is that:

a parallel conjugate cam indexing device with unevenly distributed rollers comprises an input shaft, an output indexing shaft, conjugate cams and needle bearings, wherein the conjugate cams at least comprise a first conjugate cam and a second conjugate cam, the first conjugate cam and the second conjugate cam are mutually fixed to form a connected structure and coaxially rotate with the input shaft, and the first conjugate cam and the second conjugate cam respectively comprise an arc section and a curve section; the output indexing shaft is arranged adjacent to the input shaft, a group of needle roller bearings are respectively arranged on the output indexing shaft corresponding to the first conjugate cam and the second conjugate cam and used for indexing transmission, and each group of needle roller bearings are asymmetrically distributed on the same circumference of the output indexing shaft; the curve segments of the first conjugate cam and the second conjugate cam are composed of curve segments which are respectively correspondingly meshed with the rollers of each group of needle roller bearings.

As the utility model discloses preferred technical scheme, needle bearing with when the circular arc section meshing locking of conjugate cam, the central angle that is used for forming between two adjacent needle bearing of meshing and the output graduated shaft is greater than the central angle that forms between other two arbitrary adjacent needle bearing and the output graduated shaft.

Further, the number of the needle bearings of one set is three, and each set is fixed to a position on the output index shaft corresponding to the conjugate cam.

Further, the first conjugate cam and the second conjugate cam are arranged in a mirror symmetry manner.

Further, the first and second conjugate cams are mounted on the input shaft by a cam phase pin and a cam tightening screw.

Still further, the gear box further comprises a box body, the input shaft and the output indexing shaft are mounted on the box body, and the conjugate cam and the needle bearing are located in the box body.

Furthermore, roller bearings are respectively installed at two ends of the input shaft and the output indexing shaft, outer rings of the roller bearings are installed on the box body and are axially fixed through bearing seats, and the bearing seats are installed on the box body through screws.

Still further, the roller bearing is a tapered roller bearing.

Furthermore, the box body adopts a half-open symmetrical structure which is divided into two halves in a halving way and is fastened through a connecting bolt.

The utility model has the advantages that:

the utility model relates to a parallel conjugate cam indexing device with one indexing, the curve of the conjugate cam and the needle bearing on the output shaft have a completely one-to-one correspondence relationship; through the arrangement of the needle roller bearings which are unevenly distributed along the circumference, the central angle between the two needle roller bearings participating in the intermittent positioning is increased, and the central angles of the other needle roller bearings participating in the indexing motion are reduced, so that the self-locking reliability of the output indexing shaft during the intermittent motion is improved.

Drawings

FIG. 1 is a sectional view of the structure of the embodiment of the present invention;

fig. 2 is the embodiment of the present invention, which shows the matching and positioning of the conjugate cam and the needle bearing.

Reference numerals: the device comprises an input shaft 1, a bearing seat 2, a conical thrust bearing 3, a first conjugate cam 4, a second conjugate cam 5, a box body 6, an output indexing shaft 7, an output shaft bearing seat 8, a conical roller thrust bearing 9, a needle bearing 10, a phase pin 11 and a cam fastening screw 12.

Detailed Description

Example (b):

the embodiments of the present invention will be described in detail below with reference to the accompanying drawings, and it is to be understood that the described embodiments are merely illustrative of some, but not all embodiments of the invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

A parallel conjugate cam indexing device with unevenly distributed rollers comprises an input shaft 1, an output indexing shaft 7, conjugate cams and a needle bearing 10, wherein each conjugate cam comprises a first conjugate cam 4 and a second conjugate cam 5, the first conjugate cam 4 and the second conjugate cam 5 are mutually fixed to form a connected structure and rotate coaxially with the input shaft 1, and the first conjugate cam 4 and the second conjugate cam 5 respectively comprise an arc section and a curve section; the output indexing shaft 7 is arranged adjacent to the input shaft 1, a group of needle bearings 10 are respectively arranged on the output indexing shaft 7 corresponding to the first conjugate cam 4 and the second conjugate cam 5 for indexing transmission, and each group of needle bearings 10 are asymmetrically distributed on the same circumference of the output indexing shaft 7; the curve segments of the first conjugate cam 4 and the second conjugate cam 5 are composed of sub-curve segments which are respectively correspondingly meshed with the rollers of each group of needle roller bearings 10; when the needle roller bearings 10 are engaged and locked with the circular arc sections of the conjugate cam, the central angle formed between the two adjacent needle roller bearings 10 for engagement and locking and the output indexing shaft 7 is larger than the central angle formed between any two other adjacent needle roller bearings 10 and the output indexing shaft 7.

Referring to the embodiment shown in fig. 1 and 2, the conjugate cam divider of the present embodiment is mounted on a case 6, and the case 6 is a half-split symmetrical structure divided into two halves and fastened by a connecting bolt. Conical thrust bearings 3 are installed at two ends of the input shaft 1, outer rings of the conical thrust bearings 3 are installed on the box body 6 and are axially fixed through bearing seats 2, and the bearing seats 2 are fixed on the box body 6 through a group of screws. The first conjugate cam 4 and the second conjugate cam 5 are arranged in mirror symmetry by cam phase pins 11 and are mounted on the input shaft 1 by cam fastening screws 12. Two ends of an output indexing shaft 7 are arranged on a tapered roller thrust bearing 9, an outer ring of the tapered roller thrust bearing 9 is arranged on a box body 5 and is axially fixed through a bearing seat 8, the output bearing seat 8 is fixed on a box body 6 through a hexagon socket head cap screw, six needle roller bearings 10 are fixedly arranged on the output shaft indexing shaft 7 and comprise six rollers G1-G6, and central angles formed by two adjacent rollers on the circumference and the axis of the output indexing shaft 7 are not equal. Referring specifically to fig. 1 and 2, rollers G1, G3, and G5 form a set positioned to engage first conjugate cam 4, the A1a2 curved segment, the A7A8 curved segment, and the A8A1 arc segment of roller G1 and first conjugate cam 4, the A3a4 curved segment of roller G3 and first conjugate cam 4, and the A5a6 curved segment of roller G5 and first conjugate cam 4; the rollers G2, G4 and G6 form another group and are correspondingly positioned to mesh with the second conjugate cam 5, the roller G2 and the curved section B3B4 of the second conjugate cam 5, the roller G4 and the curved section B5B6 of the second conjugate cam 5, and the roller G6 and the curved section B1B2, the curved section B7B8 and the circular section B8B1 of the second conjugate cam 5.

Power is input through the input shaft 1, the input shaft 1 is driven to rotate at a constant speed, the input shaft 1 rotates and drives the first conjugate cam 4 and the second conjugate cam 5 which are fixed on the input shaft 1 to rotate, the first conjugate cam 4 and the second conjugate cam 5 are respectively meshed with the needle roller bearings 10 of the corresponding groups on the output indexing shaft 7, the needle roller bearings 10 drive the output indexing shaft 7 to realize intermittent indexing motion, the output indexing shaft 7 rotates by a cam rotation range angle β just over 360 degrees, the cams continue to rotate by the rest (360- β) angles, the output indexing shaft 7 is stationary and is respectively meshed with the rollers G1 and G6 to complete intermittent positioning and self-locking, and the included angle between the two rollers participating in positioning is designed to be the largest as possible through the meshing of the asymmetrically distributed needle roller bearings 10 and the conjugate cam curves corresponding to one of the two rollers, so that the reliability of self-locking when the output indexing shaft stops.

The foregoing is illustrative of the preferred embodiments of the present invention only, and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof allows for variations, and in short, all variations within the scope of the independent claims of the present invention are within the scope of the present invention.

Claims (9)

1. The utility model provides a parallel conjugate cam indexing means of a division that roller is inhomogeneous distribution, includes input shaft (1), output dividing shaft (7), conjugate cam and bearing (10), its characterized in that: the conjugate cams at least comprise a first conjugate cam (4) and a second conjugate cam (5), the first conjugate cam (4) and the second conjugate cam (5) are mutually fixed to form a connected structure and rotate coaxially with the input shaft (1), and the first conjugate cam (4) and the second conjugate cam (5) respectively comprise an arc section and a curve section; the output indexing shaft (7) is arranged adjacent to the input shaft (1), a group of needle bearings (10) are respectively arranged on the output indexing shaft (7) corresponding to the first conjugate cam (4) and the second conjugate cam (5) for indexing transmission, and each group of needle bearings (10) are asymmetrically distributed on the same circumference of the output indexing shaft (7); the curve sections of the first conjugate cam (4) and the second conjugate cam (5) are composed of curve sections which are respectively engaged with the rollers of each group of needle roller bearings (10).

2. An indexing device for a parallel conjugate cam with unequally distributed rollers according to claim 1, wherein: when the needle roller bearings (10) are meshed and locked with the circular arc sections of the conjugate cams, the central angle formed between every two adjacent needle roller bearings (10) used for meshing and locking and the output indexing shaft (7) is larger than the central angle formed between every two other adjacent needle roller bearings (10) and the output indexing shaft (7).

3. An indexing device for a parallel conjugate cam with unequally distributed rollers according to claim 1 or 2, wherein: the number of the needle roller bearings (10) in one group is three, and each group of the needle roller bearings (10) is fixed on the output indexing shaft (7) at the position corresponding to the conjugate cam.

4. A indexed parallel conjugate cam indexing means with unequally distributed rollers according to claim 3, wherein: the first conjugate cam (4) and the second conjugate cam (5) are distributed in mirror symmetry.

5. A indexed parallel conjugate cam indexing means with unequally distributed rollers according to claim 3, wherein: the first conjugate cam (4) and the second conjugate cam (5) are mounted on the input shaft (1) through a cam phase pin (11) and a cam fastening screw (12).

6. A indexed parallel conjugate cam indexing means with unequally distributed rollers according to claim 3, wherein: the gear box is characterized by further comprising a box body (6), the input shaft (1) and the output indexing shaft (7) are installed on the box body (6), and the conjugate cam and the needle bearing (10) are located in the box body (6).

7. An indexing device for a parallel conjugate cam with an unequally distributed roller according to claim 6, wherein: roller bearings (9) are respectively installed at two ends of the input shaft (1) and the output indexing shaft (7), outer rings of the roller bearings (9) are installed on the box body (6) and are axially fixed through bearing seats (8), and the bearing seats (8) are installed on the box body (6) through screws.

8. An indexing device for a parallel conjugate cam with an unequally distributed roller according to claim 7, wherein: the roller bearing (9) is a tapered roller bearing.

9. An indexing device for a parallel conjugate cam with an unequally distributed roller according to claim 6, wherein: the box body (6) adopts a half-open symmetrical structure which is divided into two halves equally and is fastened through a connecting bolt.

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