CN203703058U - A Zinc Alloy Die Casting Spur Gear - Google Patents

Abstract

The utility model relates to the technical field of gears, especially, relate to a zinc alloy die-casting straight-teeth gear, including the gear body, gear body outside periphery is provided with the external tooth, and the shaft hole has been seted up at gear body middle part, the gear body is provided with outside convex protrusion face and inside sunken depressed face, and the protrusion face uses the shaft hole to be radial a plurality of strengthening ribs that are provided with as the center, and a tip of strengthening rib is connected with the outside periphery in shaft hole, and another tip of strengthening rib is connected with the outside periphery of the gear body, and per two adjacent strengthening ribs are provided with shaft hole outside periphery junction and strengthen ejecting post, and the height that highly is less than the outer terminal surface in shaft hole of. The utility model has the advantages that: 1. the design of the reinforced ejection column can ensure that the demolding is quite convenient; 2. the reinforced ejection columns are connected and combined with the reinforcing ribs, so that the strength of the whole gear is further improved; 3. the height of the reinforced ejection column is lower than that of the outer end face of the shaft hole, so that the reinforced ejection column can be prevented from influencing the installation of the whole gear.

Description

A Zinc Alloy Die Casting Spur Gear

technical field

The utility model relates to the technical field of gears, in particular to a zinc alloy die-casting spur gear.

Background technique

A gear is a mechanical element with teeth on the rim that can continuously mesh to transmit motion and power. The commonly used materials for manufacturing gears are steel, generally quenched and tempered steel, quenched steel, carburized and quenched steel and nitrided steel. The strength of cast steel is slightly lower than that of forged steel, and it is often used in larger gears; gray cast iron has poor mechanical properties and can be used in light-load open gear transmission; ductile iron can partially replace steel to make gears; plastic gears are often used In places where light loads and low noise are required, the matching gears are generally made of steel gears with good thermal conductivity. Generally, the cutting method is used for manufacturing, and the cutting method is divided into the fan-forming method and the generating method. The fan-forming method is to use a tool that is the same as or similar to the tooth groove to cut off the tooth groove to obtain the shape of the gear, such as milling with a finger or disc cutter. Gears, planing gears, etc. have low machining accuracy and production efficiency; the generation method simulates the meshing motion of a pair of gears, one is the workpiece, and the other is the tooth shape cut by the tool, such as hobbing and shaping. The precision and production efficiency are relatively high.

However, the strength of the gears produced in the prior art is relatively large, the entire production process is complicated, and the production materials are expensive. Generally, the gears used in toys and ordinary household appliances do not require high strength, and the gears used in such equipment require Large quantities, the new pressing gear technology can solve the above problems, but the die casting technology needs to take into account the demoulding problem of the product, that is, the die casting gear needs to adopt a special design in the structure to facilitate the demoulding. This technical problem has also become the industry's New problems need to be solved urgently.

Utility model content

The purpose of the utility model is to provide a zinc alloy die-casting spur gear aimed at the deficiencies of the prior art. Its special overall structural design can facilitate demoulding and maximize the strength of the gear.

In order to achieve the above purpose, a zinc alloy die-casting spur gear of the present invention includes a gear body, the outer periphery of the gear body is provided with external teeth, and the middle part of the gear body is provided with a shaft hole, and the feature is that: the gear body is provided with a direction The convex surface protruding outward and the concave surface concave inward, the convex surface is provided with several reinforcing ribs radially centered on the shaft hole, one end of the reinforcing rib is connected with the outer peripheral edge of the shaft hole, and the other end of the reinforcing rib It is connected with the outer peripheral edge of the gear body, and a reinforced ejector column is arranged at the connection between every two adjacent reinforcing ribs and the outer peripheral edge of the shaft hole. The height of the reinforced ejector column is lower than the height of the outer end surface of the shaft hole.

Wherein, the width of the reinforcing rib gradually decreases from the inner end to the outer end.

Wherein, the wall thickness of the reinforcing rib is 1/3-1/2 of the wall thickness of the gear body.

Wherein, the outer teeth are located on one side of the concave surface of the gear body, and a tooth circular stop connected with the outer teeth is provided.

Wherein, the diameter of the tooth circle stopper is slightly larger than the diameter of the top circle of the outer teeth.

Wherein, the inner surface of the shaft hole is convexly provided with four annular evenly distributed splines.

Beneficial effects of the utility model: a zinc alloy die-casting spur gear of the utility model, the two sides of the gear body are set as a convex surface protruding outward and a concave surface concave inward, and the shaft hole is the center of the convex surface Several reinforcing ribs are arranged radially, one end of the reinforcing rib is connected with the outer peripheral edge of the shaft hole, the other end of the reinforcing rib is connected with the outer peripheral edge of the gear body, and every two adjacent reinforcing ribs are connected with the outer peripheral edge of the shaft hole. There is a reinforced ejector column at the connection, and the height of the reinforced ejector column is lower than the height of the outer end surface of the shaft hole; the advantages of the gear with this structural design are: 1. The design of the reinforced ejector column can ensure that the ejector can be ejected during demoulding. The mold is very convenient to demould; 2. The reinforced ejector column is set between the ends of every two adjacent reinforcing ribs and the outer peripheral edge of the shaft hole to ensure the connection with the reinforcing ribs and further enhance the strength of the entire gear; 3 1. The height of the reinforced ejector column is lower than the height of the outer end surface of the shaft hole, which can prevent the reinforced ejector column from affecting the installation of the entire gear.

Description of drawings

Fig. 1 is a three-dimensional structure schematic diagram of the present utility model.

Fig. 2 is a front view of the gear body protruding surface direction of the utility model.

Fig. 3 is a front view of the gear body of the present invention in the direction of the concave surface.

Fig. 4 is a sectional view along line A-A in Fig. 3.

Reference signs include:

10—gear body 11—external teeth 12—shaft hole 13—reinforcing rib

14—reinforced ejector column 15—tooth round stopper 16—spline.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in detail.

As shown in Figures 1 to 4, a zinc alloy die-casting spur gear of the present invention includes a gear body 10, the outer periphery of the gear body 10 is provided with external teeth 11, and the middle part of the gear body 10 is provided with a shaft hole 12, and its characteristics That is: the gear body 10 is provided with an outwardly protruding convex surface and an inwardly concave concave surface, and the convex surface is provided with several reinforcing ribs 13 radially centered on the shaft hole 12, and one end of the reinforcing rib 13 is connected to the The outer peripheral edge of the shaft hole 12 is connected, and the other end of the reinforcing rib 13 is connected with the outer peripheral edge of the gear body 10. A reinforcing ejector column 14 is provided at the connection between every two adjacent reinforcing ribs 13 and the outer peripheral edge of the shaft hole 12 to strengthen The height of the ejecting column 14 is lower than the height of the outer end surface of the shaft hole 12 . The advantages of the gear with this structural design are: 1. The design of the reinforced ejector column 14 can ensure that the mold is ejected during demoulding, and the demoulding is quite convenient, which solves the problem of difficult demoulding in the die-casting gear technology of the prior art; 2. Strengthening The ejection column 14 is arranged between every two adjacent reinforcing ribs 13 and the ends connected to the outer peripheral edge of the shaft hole 12 to ensure that it is connected with the reinforcing rib 13, so that several reinforcing ribs 13 are connected by reinforcing the ejecting column 14 to form a 3. The height of the reinforced ejector column 14 is lower than the height of the outer end surface of the shaft hole 12 to ensure that the reinforced ejector column 14 will not be pushed against other parts, which can prevent the reinforced ejector from Post 14 affects the mounting of the entire gear.

In addition, the technical solution adopts die-casting to ensure that the entire gear is integrally formed, with high production efficiency, simple process, and low cost, while ensuring the maximum strength of the die-casted gear.

When the gear is installed on the rotating shaft and rotates, the middle part of the gear body 10 (that is, the periphery of the shaft hole 12) bears the largest force, and the force gradually decreases toward the outer periphery of the gear body 10, that is, the width of the reinforcing rib 13 The settings are gradually reduced from the inner end to the outer end, which can effectively save materials, and at the same time, ensure that each position of the entire gear has a consistent strength to meet the force during work and ensure the service life of the gear.

In this embodiment, the wall thickness of the reinforcing rib 13 is 1/3-1/2 of the wall thickness of the gear body 10; specifically, the wall thickness of the reinforcing rib 13 is 1/3, 5/12 or 1/2, the wall thickness of rib 13 of this value is used to improve the strength and rigidity of parts, prevent shrinkage and deformation of gear castings, and avoid deformation when gears are ejected from the mold. Auxiliary circuit (pathway for metal flow); through experiments, when the wall thickness of the rib 13 is less than 1/3 of the wall thickness of the gear body 10 or greater than 1/2 of the wall thickness of the gear body 10, it will affect the demoulding of the gear, It is not conducive to mass production of die-casting gears.

In this embodiment, the outer tooth 11 is located on one side of the concave surface of the gear body 10, and a tooth round stopper 15 connected with the outer tooth 11 is provided, and the tooth stopper is connected with the side surface of the outer tooth 11 , to strengthen the strength of each external tooth 11, to prevent the tooth from collapsing easily when the gear works for a long time, and the design is reasonable.

In this embodiment, the diameter of the tooth circle stopper 15 is slightly larger than the diameter of the addendum circle of the outer tooth 11. When the gear of this technical solution meshes with other gears, the design of the tooth circle stopper 15 can It is ensured that the outer teeth 11 of the two gears meshed will not easily come out of the side during the working process.

In this embodiment, the inner side of the shaft hole 12 is convexly provided with four ring-shaped evenly distributed splines 16. Traditional gears are generally designed with a single spline 16. This technical solution designs four splines 16 to further strengthen the gear and rotation. The stability of the shaft connection ensures that no slippage occurs.

The above content is only a preferred embodiment of the present utility model. For those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation and scope of application. The content of this specification should not be understood as Limitations on the Invention.

Claims (6)

1. A zinc alloy die-casting spur gear, including a gear body (10), the outer periphery of the gear body (10) is provided with external teeth (11), and the middle part of the gear body (10) is provided with a shaft hole (12), which is characterized in that : The gear body (10) is provided with an outwardly protruding convex surface and an inwardly concave concave surface, and the convex surface is provided with several reinforcing ribs (13) radially centered on the shaft hole (12). One end of (13) is connected with the outer peripheral edge of the shaft hole (12), the other end of the reinforcing rib (13) is connected with the outer peripheral edge of the gear body (10), and every two adjacent reinforcing ribs (13) are connected with the shaft A reinforced ejector column (14) is provided at the joint of the outer periphery of the hole (12), and the height of the reinforced ejector column (14) is lower than the height of the outer end surface of the shaft hole (12). 2. A zinc alloy die-casting spur gear according to claim 1, characterized in that: the width of the reinforcing rib (13) gradually decreases from the inner end to the outer end. 3. A zinc alloy die-casting spur gear according to claim 1, characterized in that: the wall thickness of the reinforcing rib (13) is 1/3-1/2 of the wall thickness of the gear body (10). 4. A zinc alloy die-casting spur gear according to claim 1, characterized in that: said external teeth (11) are located on one side of the concave surface of the gear body (10) and are provided with external teeth (11) Connected tooth circle stop (15). 5. A zinc alloy die-casting spur gear according to claim 4, characterized in that: the diameter of the tooth circle stopper (15) is slightly larger than the diameter of the addendum circle of the outer tooth (11). 6 . A zinc alloy die-casting spur gear according to claim 1 , characterized in that four ring-shaped evenly distributed splines ( 16 ) protrude from the inner side of the shaft hole ( 12 ).