CN1598358A - Planetary calibrated cam mechanism - Google Patents

Abstract

The invention relates to a planetary indexing cam mechanism, which relates to a mechanism for realizing intermittent motion, and specifically relates to an indexing cam mechanism. In order to provide an indexing cam mechanism with a compact structure to achieve indexing movement with a large index number, the technical solution adopted in the present invention is: two or more crankshafts with eccentricity, one or more transmission ring plates through the cam-pin wheel The auxiliary structure is connected to an output shaft, and one of the two or more eccentric crankshafts is an input shaft, and the projections of the axis lines of two or more eccentric crankshafts on the vertical plane are not on the same straight line, and the two Or two or more crankshafts with eccentricity form a parallelogram mechanism with the transmission ring plate; two or more crankshafts with eccentricity are not concentric with the output shaft. The invention is mainly used for manufacturing an indexing cam mechanism with simple structure, large indexing number (up to 30-50 or even larger), small volume, light weight, large number of meshing rollers at the same time, and large bearing capacity.

Description

Planetary Indexing Cam Mechanism

technical field

The invention relates to a mechanism for realizing intermittent motion, in particular to an indexing cam mechanism.

Background technique

The indexing cam mechanism is a mechanism that uses a cam mechanism to realize intermittent motion. It is widely used in various multi-station automatic machines and stepping machines, and is a key component in these automatic machines. Existing indexing cam mechanisms include three types, namely parallel indexing cam mechanisms, arcuate indexing cam mechanisms and cylindrical indexing cam mechanisms. The external meshing parallel indexing cam mechanism is limited by the structure, and its indexing number is difficult to exceed 8-12. Arc surface indexing cam mechanism adopts space cam, and needs to use special equipment for processing, so the manufacturing cost is relatively high; and due to structural limitations, its indexing number generally does not exceed 12. Although the indexing number that can be realized by the cylindrical indexing cam mechanism is large, the moment of inertia of the driven plate is large when the indexing number is large, which is not suitable for high-speed operation, so the application range of this type of mechanism is still limited to a certain extent. The main problem of the existing indexing cam mechanism is that it is difficult to realize a large indexing number with a compact structure.

Contents of the invention

In order to overcome the deficiencies of the prior art, the object of the present invention is to provide an indexing cam mechanism that realizes the indexing movement of large index numbers with a compact structure.

The technical solution adopted in the present invention is that the planetary indexing cam mechanism includes: two or more crankshafts with eccentricity, one or more transmission ring plates connected to an output shaft through the cam-pin wheel pair structure, two or more One of the two or more crankshafts with eccentricity is an input shaft, and the projections of the axis lines of the two or more crankshafts with eccentricity on the vertical plane are not on the same straight line, and each of the two or more crankshafts with eccentricity Two crankshafts and the transmission ring plate form a parallelogram mechanism; two or more crankshafts with eccentricity are not concentric with the output shaft.

Wherein, there may be two crankshafts, and one transmission ring plate, and the two crankshafts and one transmission ring plate form a parallelogram mechanism;

The structure of the cam-pin wheel pair is: a transmission ring plate with an inner cam and an output shaft with an outer pin wheel, the inner cam and the outer pin wheel form a cam-pin wheel pair;

The cam-pin wheel pair structure can also be: a transmission ring plate with an inner pin wheel and an output shaft with an outer cam, and the inner pin wheel and the outer cam form a cam-pin wheel pair;

The pin teeth on the pin wheel in the cam-pin wheel pair structure are evenly distributed on the circumference according to the number of divisions;

The cam in the cam-pin wheel pair structure is provided with irregular tooth profiles determined according to the number of divisions and the law of motion.

The present invention can bring the following effects: due to the use of two or more eccentric crankshafts, the transmission ring plate is connected to an output shaft structure through the cam-pin wheel pair structure, so it has a simple structure and a large number of divisions (up to 30 to 50 or even larger), small size, light weight, large number of meshing rollers at the same time, and large load capacity, can replace cylindrical indexing cam mechanism and internal meshing parallel indexing cam mechanism, and can also replace to a certain extent Externally engaging parallel indexing cam mechanism.

Description of drawings

Fig. 1 is a kind of cam of the present invention - the layout of pin wheel pair is the shape structure schematic diagram of outer cam - inner pin wheel (I type structure), and as abstract accompanying drawing.

Fig. 2 is a schematic diagram of the shape and structure of a cam-pin wheel pair of the present invention whose layout is an inner cam-outer pin wheel (Type II structure).

Fig. 3 is a schematic diagram of the shape and structure of an embodiment of the present invention. In Figure 3:

1: crank shaft 2: transmission ring plate 3: output shaft 4: inner needle wheel 5: outer cam 6: outer needle wheel 7: inner cam

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and examples.

The object of the present invention is achieved like this: a planetary indexing cam mechanism, its basic type includes two crankshafts with eccentricity, a drive ring plate with an inner cam (or inner needle wheel) and a belt outer needle wheel (or outer cam) output shaft. If increase the quantity of crankshaft or change its position (but guarantee that the projection of its axis on the vertical plane is not on the same straight line), several derivative types can be formed. One of the two crankshafts with eccentricity is an input shaft; two crankshafts with eccentricity and a transmission ring plate with an inner cam (or inner needle wheel) form a parallelogram mechanism; with an inner cam (or inner needle wheel) The transmission ring plate and an output shaft with an outer needle wheel (or outer cam) form a cam-pin wheel pair, and the cam-pin wheel pair can have an outer cam-inner needle wheel (I-type structure) and an inner cam-outer needle There are two layouts of wheel (Type II structure). The needle teeth on the pin wheel are evenly distributed on the circumference according to the number of divisions, and the cam is provided with irregular tooth profiles determined according to the number of divisions and the law of motion; the input shaft The movement of the transmission ring determines the plane movement of the transmission ring plate, the movement of the output shaft is determined by the fixed axis rotation of the outer needle wheel or the outer cam, and the cam-pin wheel pair realizes intermittent rotary motion.

In Fig. 1, the cam-pin wheel pair in the planetary indexing cam mechanism is set as an outer cam 5-inner pin wheel 4 (I-type structure), and the pin teeth on the inner pin wheel 4 are arranged on the circumference according to the number of indexing numbers. The points are evenly distributed, and the outer cam 5 is provided with irregular tooth profiles determined according to factors such as the number of divisions.

The planar movement of the inner needle wheel 4 is determined by the input shaft, and the outer cam 5 rotates on a fixed axis under the action of the inner needle wheel 4. During the fixed axis rotation, the intermittent motion is realized according to the tooth profile of the outer cam 5 according to a certain motion law. sports.

In Fig. 2, the cam-pin wheel pair in the planetary indexing cam mechanism is set as an inner cam 7-outer pin wheel 6 (type II structure), and the pin teeth are equally divided on the circumference according to the number of indexing numbers on the outer pin wheel 6 Evenly distributed, the inner cam 7 is provided with irregular tooth profiles determined according to factors such as the number of divisions.

The planar movement of the inner cam 7 is determined by the input shaft, and the outer needle wheel 6 rotates on a fixed axis under the action of the inner cam 7. During the fixed axis rotation, intermittent motion is realized according to a certain motion law according to the tooth profile of the inner cam 7. .

Figure 3 shows an embodiment of the present invention. Present embodiment adopts I type structure, is made up of three crankshafts 1 (wherein one is input shaft), the transmission ring plate 2 of a band inner pin wheel 4 and the output shaft 3 of a band outer cam 5. When the input shaft rotates at a constant speed, it drives the inner needle wheel 4 on the transmission ring plate 2 to move in a plane, and the outer cam 5 rotates on a fixed axis opposite to the direction of the input shaft under the action of the inner needle wheel 4. At this time, the outer cam The angular velocity of 5 changes according to intermittent motion.

For example, when the application requires 12 degrees of motion, the number of needle teeth is 12, that is, the pin wheel is divided into 12 equal parts, and the tooth profile on the cam is an irregular tooth profile determined according to the number of degrees and other factors. , the number of teeth is 11. Its working process is as described above. In fact, when the number of divisions is required to be n, the pin wheel should be set to n equal divisions.

This invention has broad application prospects in light industrial automatic machines that require large indexing, large load, and small volume, and can replace cylindrical indexing cam mechanisms and internal meshing parallel indexing cam mechanisms, and can also replace external cam mechanisms to a certain extent. The meshing parallel indexing cam mechanism may become a new generation of intermittent indexing and stepping conveying mechanisms, has broad market prospects, and will certainly bring greater economic benefits.

Claims (6)

1. planet scale division cam structure, it is characterized in that, comprise: the eccentric crankshaft of band more than two or two, the above transmission ring flat-plate of a slice or a slice connects an output shaft by cam-pinwheel auxiliary structure, there is one to be input shaft in the crankshaft of band off-centre more than two or two, not on same straight line, per two of the eccentric crankshaft of band is formed parallel-crank mechanism with the transmission ring flat-plate to the eccentric crankshaft axis of band more than two or two in the projection on the vertical surface more than two or two; Eccentric crankshaft and the output shaft decentraction of band more than two or two.

2. a kind of planet scale division cam structure according to claim 1 is characterized in that, crankshaft is two, and the transmission ring flat-plate is a slice, and two crankshafts and a slice transmission ring flat-plate are formed parallel-crank mechanism.

3. a kind of planet scale division cam structure according to claim 1 is characterized in that, cam-pinwheel auxiliary structure is: the output shaft of the transmission ring flat-plate of a slice band cam ring and an outer pinwheel of band, cam ring, outer pinwheel form cam-pinwheel pair.

4. a kind of planet scale division cam structure according to claim 1 is characterized in that, cam-pinwheel auxiliary structure is: the output shaft of the transmission ring flat-plate of pinwheel and a band external cam in a slice band, interior pinwheel, external cam form cam-pinwheel pair.

5. a kind of planet scale division cam structure according to claim 1 is characterized in that, the pin tooth on the pinwheel in cam-pinwheel auxiliary structure is uniform by number five equilibrium on circumference of the number of divisions.

6. a kind of planet scale division cam structure according to claim 1 is characterized in that, the cam in cam-pinwheel auxiliary structure is provided with according to the number of divisions and the characteristics of motion and fixed irregular flank profil line.

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