CN215890999U - Pinion for electric screw press - Google Patents

Abstract

The utility model discloses a pinion for an electric screw press, which comprises a polymer gear body and a metal shaft sleeve. Wherein the metal shaft sleeve is integrally cast in the polymer gear body. The inner ring of the metal shaft sleeve is provided with a key groove for being connected with a flat key on a motor shaft; be equipped with the wing muscle along outer lane circumference, it had both increased the area of contact of metal material axle sleeve and polymer material gear body, made both combine more firmly, improved the intensity of gear again, can be used for transmitting the place of higher power with this gear, enlarged the application range of gear. The outer lane of metal material axle sleeve still is provided with a plurality of vertical recesses, still is provided with the hole groove that link up on the wing muscle, above-mentioned part on the one hand increased with the bonding strength of polymer material gear body, make polymer material gear body atress more even, on the other hand has alleviateed the weight of metal material axle sleeve for the inertia of pinion is littleer.

Description

Pinion for electric screw press

Technical Field

The present invention relates to a gear, and more particularly, to a pinion for an electric screw press.

Background

Gears are mechanical elements that continuously mesh to transmit motion and power. At present, the pinion of the electric screw press is a metal gear, but in practical production and use, the metal pinion has some defects: firstly, the metal pinion has large mass and high requirements on the strength and the rigidity of a motor shaft, and a special motor is required to be used; secondly, a complex oil circuit lubricating system is needed for the meshing of the metal pinion and the large gear, and the transmission noise is large; thirdly, the hardness of the tooth surface of the metal pinion gear is high, and in order to protect the large gear engaged therewith from abrasion, the tooth surface of the large gear must be subjected to quenching heat treatment, which greatly increases the manufacturing cost of the device.

CN2076635U provides a steel-plastic pinion, including the gear body, be provided with the teeth of a cogwheel on the outer peripheral face of gear body, be provided with the shaft hole at the central part of gear body, the gear body is including adopting plastics system outer lane, plastics system inner circle and steel connecting portion, plastics system outer lane, plastics system inner circle and steel connecting portion all are cyclic annularly, plastics system outer lane fixed connection is in the periphery of steel connecting portion, plastics system inner circle fixed connection is in the inner periphery of steel connecting portion, the teeth of a cogwheel set up on the outer peripheral face of plastics system outer lane, the shaft hole sets up the central part at plastics system inner circle.

Although this patent adopts the mode preparation gear that working of plastics and steelwork combined together, has alleviateed gear weight, has improved the intensity of gear to have self-lubricating function, its inner circle adopts plastics to make, and its intensity is lower, easy wearing and tearing fracture, and the steel connecting portion that uses are cyclic annular, are equipped with the reinforcing plate in, and the structure is complicated and locate in the middle of the gear body plastics, and the pouring technology is complicated, produces the substandard product easily, has increaseed manufacturing cost.

Disclosure of Invention

Aiming at the defects or improvement requirements of the prior art, the utility model provides the gear which is high in inner ring strength, simple in reinforcing part structure, easy to machine, simple in pouring process and low in production cost.

In order to achieve the above object, the present invention provides a pinion for an electric screw press, comprising a gear body made of polymer material, wherein gear teeth are arranged on the outer circumference of the gear body; the gear body is of a hollow cylindrical structure, a key groove connected with the motor shaft in a limiting mode is formed in the inner wall surface of the metal shaft sleeve, at least one wing rib is arranged on the outer wall surface of the metal shaft sleeve, injection molding cavities are formed in positions, corresponding to the wing ribs, of the polymer gear body, hole grooves are formed in the wing ribs in a penetrating mode in the circumferential direction, and the wing ribs, the injection molding cavities and the hole grooves are fixedly connected with the polymer gear body and the metal shaft sleeve through injection molding.

Furthermore, the wing muscle is a plurality of, and the circumference is located on the metal material axle sleeve outer wall.

Furthermore, the height of the wing rib in the vertical direction is smaller than that of the metal shaft sleeve, and the wing rib is arranged on the outer wall surface of the metal shaft sleeve in the middle.

Furthermore, a plurality of grooves are formed in the outer wall of the metal shaft sleeve in the vertical direction.

Preferably, the groove is semicircular in cross section.

Preferably, the groove is rectangular in cross-section.

In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:

(1) according to the pinion, the metal shaft sleeve and the wing ribs arranged on the metal shaft sleeve are adopted to replace the original plastic material, the overall structural strength of the polymer gear body is enhanced, the vertical grooves arranged on the metal shaft sleeve are formed through the through holes arranged on the wing ribs, the weight of the metal shaft sleeve is reduced, the rotational inertia of the pinion is smaller, meanwhile, the bonding strength with the polymer gear body is improved, and the stress of the polymer gear body is more uniform.

(2) The pinion of the utility model fully exerts the characteristics of plastics and metals: the gear teeth are made of plastic, so that the gear teeth have good self-lubricating performance, are meshed with the large gear without lubrication and have low transmission noise; the inner ring part is made of metal material, has higher strength and rigidity, and can ensure reliable connection with a motor shaft; the pinion is made by polymer material gear body and metal material axle sleeve, and weight greatly reduced than metal gear, its inertia is half of equidimension metal gear, greatly reduced the output load of pinion motor shaft, have great advantage to the life of extension motor.

(3) The pinion comprises a polymer gear body and a metal shaft sleeve, wherein the polymer gear body is arranged on the outer side, the metal shaft sleeve is arranged on the inner side, and the thermal expansion coefficient of plastic is far larger than that of metal, so that the polymer gear body tightly wraps the metal shaft sleeve when the integral gear is integrally cast and formed, and the problem of low bonding strength of a dissimilar material interface is ingeniously avoided.

(4) The pinion is formed by placing a metal shaft sleeve as a mold core into a casting mold for one-time casting. The metal shaft sleeve has higher strength and rigidity, and comprises a key groove arranged on the cylindrical inner ring, and a wing rib and a vertical groove arranged on the cylindrical outer ring, so that the metal shaft sleeve is simple in structure, easy to process, low in production difficulty and production cost, and has greater popularization value.

Drawings

FIG. 1 is a schematic structural view of a pinion for an electric screw press according to an embodiment of the present invention;

fig. 2 is a schematic cross-sectional view of a pinion for an electric screw press according to an embodiment of the present invention.

In all the figures, the same reference numerals denote the same features, in particular: 1-polymer gear body, 2-metal shaft sleeve, 3-wing rib, 4-key groove, 5-groove, 6-hole groove and 7-gear tooth.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The embodiment of the utility model provides a pinion for an electric screw press, which comprises a polymer gear body 1 and a metal shaft sleeve 2. Wherein the metal shaft sleeve 2 is integrally cast in the polymer gear body 1. The metal shaft sleeve 2 comprises a key groove 4 arranged on the inner wall surface thereof and used for being connected with a flat key on a motor shaft; the wing ribs 3 are arranged along the circumferential direction of the outer wall surface of the gear, the contact area between the metal shaft sleeve 2 and the polymer gear body 1 is increased by the wing ribs 3, the metal shaft sleeve and the polymer gear body are combined more firmly, the strength of the gear is improved, the gear can be used in places for transmitting higher power, and the application range of the gear is enlarged. The metal shaft sleeve 2 further comprises a groove 5 vertically formed in the outer wall surface of the metal shaft sleeve, and a through hole 6 is formed in the wing rib 3, so that the contact area between the metal shaft sleeve 2 and the polymer gear body 1 is increased, the weight of the metal shaft sleeve 2 is reduced, and the rotational inertia of the pinion is smaller; the pouring of polymer material gear body outer lane is equipped with teeth of a cogwheel 7, and it has good self-lubricating performance, and it is very little to need not lubricated and transmission noise with gear wheel meshing.

As shown in fig. 1-2, the metal bushing 2 has high strength and rigidity, and can ensure reliable connection with a motor shaft. The center of the metal shaft sleeve 2 is of a hollow cylindrical structure, a key groove 4 with a square section is concavely arranged on the inner wall surface of the metal shaft sleeve, and the gear and the motor shaft are stably connected together through the key groove 4. The outer wall of the metal shaft sleeve 2 is provided with 2 or more wing ribs 3, a plurality of vertical grooves 5 are further formed in the outer wall, and hole grooves 6 are further formed in the wing ribs 3.

Wherein 3 circumference of wing muscle are located on the outer wall of metal material axle sleeve 2, and is preferred, at 3 highly being less than metal material axle sleeve 2 of wing muscle in vertical direction, it locates on the outer wall of metal material axle sleeve 2 between two parties, can further lighten gear weight, has also strengthened the bonding strength of polymer material gear body and metal material axle sleeve 2 simultaneously. Run through along the circumferencial direction on the wing muscle 3 and be equipped with hole groove 6, polymer material gear body 1 is equipped with the cavity of moulding plastics with wing muscle 3 corresponding position, the back of moulding plastics, 3 upper ends of wing muscle and hypomere are covered by plastics, fix it in polymer material gear body 1, the plastics of pouring in hole groove 6 link as an organic whole with the outside, further die wing muscle 3 lock and polymer material gear body 1 link as an organic whole, when having avoided the gear engagement motion, vertical and horizontal direction displacement takes place for polymer material gear body 1 for metal material axle sleeve 2.

Locate the recess 5 on the metal material axle sleeve 2 urceolus, its and the macromolecule material gear body 1 position that pours in the recess and form each other are the hasp structure to increase both mechanics bonding strength. The groove may be formed in a shape having a semicircular, elliptical, rectangular, or droplet-shaped cross section in the horizontal direction, or in another shape which can be easily processed, can increase the contact area, or can reduce the weight of the metal material shaft sleeve 2. Vertical recess 5 the weight of metal material axle sleeve 2 has been alleviateed for the inertia of pinion is littleer, has increased the area of contact with polymer material gear body 1 simultaneously, makes more firm that both combine.

The pinion fully exerts the characteristics of plastics and metals: the gear teeth are made of plastic, so that the gear teeth have good self-lubricating performance, are meshed with the large gear without lubrication and have low transmission noise; the inner ring part is made of metal material, has higher strength and rigidity, and can ensure reliable connection with a motor shaft; the pinion is made by polymer material gear body 1 and metal material axle sleeve 2, and weight greatly reduced than metal gear, its inertia is half of equidimension metal gear, greatly reduced the output load of pinion motor shaft, have great advantage to the life of extension motor.

According to the pinion, the metal shaft sleeve 2 which is machined in advance is placed into a casting mold as a mold core and then is cast and integrally formed, and the high-polymer gear body 1 is arranged on the outer side, the metal shaft sleeve 2 is arranged on the inner side, and the thermal expansion coefficient of plastic is far larger than that of metal, so that the high-polymer gear body 1 can tightly wrap the metal shaft sleeve 2 when the pinion is integrally cast and formed, and the problem of low bonding strength of a dissimilar material interface is ingeniously avoided. The metal shaft sleeve 2 is simple in structure and easy to process, can be directly cast when plastic is cast, does not need secondary casting or casting after positioning by using a support, reduces the production difficulty and the production cost, and has great popularization value.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the utility model, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (6)

1. A pinion for an electric screw press, comprising:

the outer circumference of the gear body (1) made of polymer materials is provided with gear teeth (7);

and metal material axle sleeve (2), metal material axle sleeve (2) are hollow cylindric structure, and its inner wall face is equipped with and connects spacing keyway (4) with the motor shaft, and its outer wall face is equipped with at least one wing muscle (3), polymer material gear body (1) is equipped with the cavity of moulding plastics with wing muscle (3) corresponding position, wing muscle (3) link up along the circumferencial direction and are equipped with hole groove (6), wing muscle (3), the cavity of moulding plastics and hole groove (6) are realized through moulding plastics polymer material gear body (1) and metal material axle sleeve (2) fixed connection.

2. A pinion for an electric screw press according to claim 1, characterized in that said ribs (3) are provided in plurality and circumferentially on the outer wall of said metal sleeve (2).

3. Pinion for an electric screw press according to claim 2, characterised in that the height of the said ribs (3) in the vertical direction is smaller than the vertical height of the said bush (2).

4. A pinion for an electric screw press according to any of claims 1-3, characterised in that the metal sleeve (2) is provided with a plurality of grooves (5) in the vertical direction on its outer wall.

5. Pinion for an electric screw press according to claim 4, characterised in that said recess (5) is rectangular in cross-section.

6. Pinion for an electric screw press according to claim 4, characterised in that said groove (5) is semicircular in cross-section.

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