CN213451578U

CN213451578U - Combined gear

Info

Publication number: CN213451578U
Application number: CN202022036918.5U
Authority: CN
Inventors: 赵萍丽; 刘富凯; 康洪飞
Original assignee: ZHOUSHAN 7412 FACTORY
Current assignee: ZHOUSHAN 7412 FACTORY
Priority date: 2020-09-17
Filing date: 2020-09-17
Publication date: 2021-06-15
Anticipated expiration: 2030-09-17

Abstract

The utility model provides a composite gear, including the gear body, be provided with internal tooth and external tooth on the gear body, the gear body is by the first transmission portion that can link mutually with drive gear, can with the second transmission portion that drive gear linked mutually and can constitute the connecting portion of gear body coupling on the bearing, first transmission portion, second transmission portion and connecting portion are the integrative structure that cold extrusion formed, top in first transmission portion is provided with the cavity, the internal tooth distributes on the inner wall circumference of cavity, can with the fixed second connecting portion of connecting axle that is used for connecting drive gear on the bottom surface of cavity, the external tooth distributes on the outer wall circumference of second transmission portion, the rotation center of internal tooth is located the same axis with the rotation center of external tooth. The utility model has the advantages that: the coaxiality of the inner teeth and the outer teeth is good, the abrasion of the inner teeth and the outer teeth can be reduced during transmission, and the service life of the combined gear is prolonged.

Description

Combined gear

Technical Field

The utility model relates to a gear preparation technical field especially indicates a combination gear.

Background

The traditional Chinese patent application with the application number of CN201410416543.1 named as 'combination gear' discloses a combination gear, which comprises an external gear and an internal gear, wherein the peripheral surface of the internal gear is provided with a driving rack, the inner peripheral surface of the external gear is provided with a driven rack meshed with the driving rack, the peripheral surface of the internal gear is provided with a plurality of notches, the two transverse sides of each notch are respectively provided with a stressed longitudinal bar, the inner peripheral surface of the external gear is provided with a stressed groove matched with the stressed longitudinal bars, when the external gear is connected with the internal gear, the stressed longitudinal bars are arranged in the stressed grooves, the outer peripheral side walls of the stressed longitudinal bars are abutted against the inner peripheral side walls of the stressed grooves, and the two abutted surface surfaces of the stressed longitudinal bars and the stressed grooves are; the inner gear and the outer gear are detachable, so that the inner gear or the outer gear can be conveniently replaced when damaged, the function of the gear is exerted to the maximum extent, resources are saved, the cost is reduced, and the condition that the combined gear is damaged due to the fact that the outer gear falls off when the combined gear runs at a high speed is avoided as the rubber is coated on the two mutually-abutted surface surfaces of the stressed longitudinal strip and the stressed groove. However, the external gear and the internal gear of the combination gear have low coaxiality, are easy to wear during rotation, and have short service life, so the structure of the combination gear needs to be further improved.

Disclosure of Invention

The utility model aims to solve the technical problem that to above-mentioned prior art current situation and provide a combination gear that internal tooth and external tooth axiality are high.

The utility model provides a technical scheme that above-mentioned technical problem adopted does: this combination gear, including the gear body be provided with internal tooth and external tooth on the gear body, its characterized in that: the gear body by can with drive gear first transmission portion that links mutually, can with the second transmission portion that drive gear linked mutually and can constitute the connecting portion on the bearing with gear body coupling, first transmission portion, second transmission portion and connecting portion are the integrative structure that cold extrusion formed the top of first transmission portion is provided with the cavity, the internal tooth distributes on the inner wall circumference of cavity can with the second connecting portion that are used for being connected drive gear's connecting axle and fix on the bottom surface of cavity, the external tooth distributes on the outer wall circumference of second transmission portion, the center of rotation of internal tooth is located the same axis with the center of rotation of external tooth.

As an improvement, the first transmission part is a disc body, the concave cavity is located on the top surface of the disc body, the second transmission part is a cylinder, the diameter of the cylinder is smaller than that of the disc body, and the connecting part is a second cylinder, the diameter of which is smaller than that of the cylinder.

In a further improvement, the disk body is a disk with a right-angle edge at the top edge and the bottom edge formed by cold pressing.

In a further improvement, a circular groove is arranged on the bottom surface of the concave cavity, and the second connecting part is positioned on the bottom surface of the circular groove.

In a further improvement, the second connecting part is a connecting concave part which can be inserted and fixed with one end of the connecting shaft.

The improved structure is further improved in that the overlook projection of the connecting concave part is circular, and the diameter of the connecting concave part is 0.3-1 mm smaller than that of the end part of the connecting shaft.

In a further improvement, when one end of the connecting shaft is inserted and fixed in the connecting concave part, one end of the connecting shaft extends out of the top opening of the concave cavity.

As a modification, a boss portion is provided on the bottom surface of the circular disk body, and the top surface of the cylinder is connected to the boss portion.

In a further improvement, the diameter of the outer contour line corresponding to the outer teeth is smaller than that of the boss part.

As an improvement, the height of the external teeth is greater than the height of the internal teeth.

Compared with the prior art, the utility model has the advantages of: the first transmission part, the second transmission part and the connecting part are of an integrated structure formed by cold extrusion, the coaxiality of the inner teeth and the outer teeth is good, the transmission efficiency of the combined gear is improved, the abrasion of the inner teeth and the outer teeth can be reduced during transmission, and the service life of the combined gear is prolonged; the cold extrusion can improve the precision of the combined gear through reasonable die design and improve the yield; the cold extrusion forming reduces the cutting amount of the gear blank, saves materials, correspondingly improves the processing efficiency and effectively reduces the processing cost. Because the internal tooth and the external tooth are in an integrally formed structure, the product has complete and smooth appearance and good strength, and the service life of the combined gear is further prolonged.

Drawings

FIG. 1 is a perspective view of the embodiment of the present invention, which is coupled to a connecting shaft;

FIG. 2 is an exploded view of the structure of FIG. 1;

fig. 3 is a perspective view of an embodiment of the present invention;

FIG. 4 is a perspective view of FIG. 3 at a different angle;

FIG. 5 is a front perspective view of FIG. 3;

fig. 6 is a bottom view of fig. 3.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

As shown in fig. 1 to 6, the composite gear of the present embodiment includes a gear body 1, inner teeth 11 and outer teeth 12 are provided on the gear body 1, the gear body 1 is composed of a first transmission part a capable of linking with a driving gear, a second transmission part B capable of linking with the driving gear, and a connection part C capable of connecting the gear body 1 to a bearing, the first transmission part a, the second transmission part B, and the connection part C are an integrated structure formed by cold extrusion, a cavity 13 is provided on the top of the first transmission part a, the inner teeth 11 are distributed on the circumference of the inner wall of the cavity 13, the second connection part fixed to a connection shaft 2 for connecting the driving gear is provided on the bottom surface of the cavity 13, the outer teeth 12 are distributed on the circumference of the outer wall of the second transmission part B, and the rotation center of the inner teeth 11 and the rotation center of the outer teeth 12 are located on the same axis.

The first transmission part A is a disc body 14, the concave cavity 13 is positioned on the top surface of the disc body 14, the second transmission part B is a cylinder, the diameter of the cylinder is smaller than that of the disc body 14, and the connecting part C is a second cylinder, the diameter of which is smaller than that of the cylinder. The disk body 14 is a disk with right-angle sides at the top edge and the bottom edge formed by cold pressing. A circular groove 131 is provided on the bottom surface of the cavity 13, and the second connecting portion is located on the bottom surface of the circular groove 131. The second connecting portion is a connecting recess 132 that can be inserted and fixed to one end of the connecting shaft 2. The planar projection of the connecting recess 132 is circular, and the diameter of the connecting recess 132 is 0.3-1 mm smaller than the diameter of the end of the connecting shaft 2. The center of the circle of the connecting recess 132 is located on the same axis as the center of rotation of the internal teeth 11. When one end of the connecting shaft 2 is inserted and fixed in the connecting recess 132, one end of the connecting shaft 2 protrudes out of the top opening of the cavity 13. A boss portion 141 is provided on the bottom surface of the disk body 14, and the top surface of the cylindrical body is connected to the boss portion 141. The diameter D of the outer contour line corresponding to the outer teeth is smaller than the diameter of the boss part. The outer tooth height H is greater than the inner tooth height.

The working principle is as follows: the first transmission part, the second transmission part and the connecting part are of an integrated structure formed by cold extrusion, so that the internal teeth and the external teeth can keep good coaxiality, and the precision of the combined gear is correspondingly improved. The gear shaft assembly is formed by combining a gear body and a connecting shaft in an interference fit manner, wherein the gear body is produced by cold extrusion and machining, the internal teeth and the external teeth are both formed by cold extrusion, and the inner hole and the small end face are formed by machining. The gear body and the end part of the connecting shaft are combined together after carburization and quenching (the surface hardness can reach 700 HV).

When the gear is used, other components are assembled on the connecting shaft, and the components and the inner teeth of the gear body can transmit, so that the connecting shaft and the inner teeth of the gear body need to have good position;

through cold extrusion molding, the coaxiality of the inner teeth and the outer teeth is good, and the product precision is high; the combined gear has the advantages of less machining allowance, high machining efficiency and low machining cost; the inner teeth and the outer teeth are integrally formed, the metal streamline is complete, and the product strength is good.

Claims

1. The utility model provides a combination gear, includes gear body (1) be provided with internal tooth (11) and external tooth (12) on gear body (1), its characterized in that: gear body (1) by first transmission portion (A) that can link mutually with drive gear, can with second transmission portion (B) that drive gear linked mutually and can constitute connecting portion (C) on the bearing with gear body (1), first transmission portion (A), second transmission portion (B) and connecting portion (C) are the integrative structure that cold extrusion formed the top of first transmission portion (A) is provided with cavity (13), internal tooth (11) distribute on the inner wall circumference of cavity (13) can with be used for being connected connecting axle (2) fixed second connecting portion mutually on the bottom surface of cavity (13), external tooth (12) distribute on the outer wall circumference of second transmission portion (B), the center of rotation of internal tooth (11) is located the same axis with the center of rotation of external tooth (12).

2. The combination gear of claim 1, wherein: first transmission portion (A) is the disc body (14), cavity (13) are located the top surface of the disc body (14), second transmission portion (B) is the cylinder, the diameter of cylinder is less than the diameter of the disc body (14), connecting portion (C) are the second cylinder that the diameter is less than the cylinder.

3. The combination gear of claim 2, wherein: the disc body (14) is a disc with right-angle edges at the top edge and the bottom edge formed by cold pressing.

4. The combination gear of claim 3, wherein: a circular groove (131) is formed in the bottom surface of the cavity (13), and the second connecting portion is located on the bottom surface of the circular groove (131).

5. The combination gear of claim 4, wherein: the second connecting part is a connecting concave part (132) which can be inserted and fixed with one end of the connecting shaft (2).

6. The combination gear of claim 5, wherein: the overlook projection of the connecting concave part (132) is circular, and the diameter of the connecting concave part (132) is smaller than the diameter of the end part of the connecting shaft (2) by 0.3-1 mm.

7. The combination gear of claim 5, wherein: when one end of the connecting shaft (2) is inserted and fixed in the connecting concave part (132), one end of the connecting shaft (2) extends out of the top opening of the concave cavity (13).

8. The composite gear according to any one of claims 2 to 6, wherein: a boss part (141) is provided on the bottom surface of the disk body (14), and the top surface of the cylinder is connected to the boss part (141).

9. The combination gear of claim 7, wherein: the diameter (D) of the outer contour line corresponding to the outer teeth is smaller than the diameter of the boss part.

10. The composite gear according to any one of claims 1 to 6, wherein: the outer tooth height (H) is greater than the inner tooth height.