CN211599465U - Plastic transmission gear - Google Patents

Abstract

The utility model relates to the field of model design, and particularly provides a plastic transmission gear, which comprises a transmission gear main body, a tooth socket, a fixed protrusion and a central shaft hole; the tooth socket is arranged on the outer side of the transmission gear main body, the fixing protrusion is arranged in the center of the back side of the transmission gear main body, and the central shaft hole is formed in the fixing protrusion. Wherein, the teeth of a cogwheel in the tooth's socket is skewed tooth and straight-tooth combination tooth setting, and originally through above-mentioned structure, realized that central shaft hole can compatible male plastics cross axle, straight axle and thick circle axle simultaneously through the mode that sets up the cross fixed slot, widened the utility model discloses a use the scene, solved several important problems in the middle of the current plastic gear technique: the existing plastic gear has small diameter and poor gear transmission speed change effect; secondly, the existing plastic gear has a small central hole and a single hole type, is only suitable for inserting thin round shafts of 2mm, 2.5mm and 3mm, but cannot be compatibly inserted into thick round shafts of about 5mm and plastic straight and cross shafts.

Description

Plastic transmission gear

Technical Field

The utility model belongs to the technical field of model design and specifically relates to a plastics drive gear.

Background

In current domestic children DIY toy and scientific and technological model design and manufacture, the aperture of the plastics gear that uses has 2mm, 2.5mm, 3mm, all carries out the transmission through inserting thin iron shaft moreover, however this kind of setting mode has following 3 kinds of shortcomings:

1. the outer diameter of the existing plastic gear is generally small, the speed change effect is poor, and the diameter is generally 18-30 mm.

2. The existing plastic gear has a small central hole and a single hole pattern, is only suitable for inserting thin iron shafts of 2mm, 2.5mm and 3mm which are not easy to cut by oneself, and cannot be compatible with inserting plastic straight shafts and cross shafts and round wooden bars of about 5mm which are easy to cut by hands;

3. the existing plastic straight tooth gear can only be singly driven in the same plane in a meshing way, and the vertical meshing and three-dimensional driving of two gears cannot be realized.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a simple structure, use the wider plastics drive gear of scene simultaneously.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a plastic transmission gear comprises a transmission gear main body, a tooth socket, a fixed protrusion and a central shaft hole;

the tooth socket is arranged on the outer side of the transmission gear main body, the fixing protrusion is arranged in the center of the back side of the transmission gear main body, and the central shaft hole is formed in the fixing protrusion.

The gear teeth in the tooth grooves are formed by combining helical teeth and straight teeth.

Further, the diameter range of the central shaft hole is 4.90mm-5 mm.

Furthermore, the plastic transmission gear further comprises a cross fixing groove;

the cross fixing groove is arranged on the central shaft hole and can be used for being inserted with a plastic cross shaft, a straight shaft and a round shaft in a compatible mode.

Furthermore, the plastic transmission gear also comprises an eccentric shaft jack;

the eccentric shaft insertion hole is provided at one side of the fixing protrusion.

Further, the transmission gear body is made of ABS or polypropylene, or the transmission gear body, the tooth grooves and the fixing protrusions are made of ABS or polypropylene.

The utility model adopts the above structure, have following 3 advantages:

through setting up the mode that cross fixed slot and central authorities ' round hole combined together, realized that central authorities ' shaft hole and cross recess can compatible male plastics cross axle, a word axle and thick circle axle simultaneously, widened the utility model discloses an use the scene, solved among the prior art drive gear's transmission aperture generally little, the pass is single, only be applicable to and insert 2mm, 2.5mm, 3mm thin iron axle, lead to the not strong problem of compatibility.

Through inciting somebody to action the teeth of a cogwheel in the tooth's socket sets up to the mode that skewed tooth and straight-tooth combination set up, has realized the utility model discloses can realize perpendicular meshing and parallel meshing two kinds of states when meshing with all the other drive gear transmissions.

The large gear, the small gear and the medium gear can realize speed reduction or speed increase transmission through three different diameters, namely large, medium and small, and can also realize same-speed different-direction transmission of the same gear. The problem of among the prior art transmission gear's external diameter generally less, the diameter is generally at 18-30 mm, leads to joining together and use the time-varying quick effect unsatisfactory is solved.

Drawings

Fig. 1 is a schematic structural view of an embodiment of a plastic transmission gear according to the present invention;

fig. 2 is a rear view of another embodiment of the plastic transmission gear of the present invention;

the number designations in the figures are: 10-transmission gear body, 20-straight helical tooth and tooth socket, 30-fixed protrusion, 40-central shaft hole, 50-cross fixed slot and 60-eccentric shaft jack.

Detailed Description

The following describes the present invention with reference to the accompanying drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features related to the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

A plastic transmission gear, as shown in fig. 1 and 2, comprises a transmission gear body 10, a tooth space 20, a fixed protrusion 30 and a central shaft hole 40;

the spline 20 is disposed outside the main body of the transmission gear 10, the fixing protrusion 30 is disposed at the center of the back side of the transmission gear body 10, and the central shaft hole 40 is disposed on the fixing protrusion 30.

As shown in fig. 1, the gear teeth in the tooth grooves 20 are formed by combining helical teeth and straight teeth;

the central shaft hole 40 is used for fixing a transmission shaft passing through;

the tooth grooves 20 are used for parallel meshing and vertical meshing with other gears, so that different linkage modes between transmission gears are realized.

Further, the diameter of the central axial bore 40 ranges from 4.90mm to 5 mm.

Further, as shown in fig. 1, the plastic transmission gear further includes a cross fixing groove 50;

the cross fixing groove 50 is arranged on the central shaft hole 40;

the cross fixing groove 50 is used to fix a cross shaft and a straight shaft inserted from the center shaft hole 40.

Further, as shown in fig. 1, the one plastic transmission gear further includes an eccentric shaft insertion hole 60;

the eccentric shaft insertion hole 60 is provided at one side of the fixing boss 30;

the eccentric shaft insertion hole 60 is used for inserting a round bar as a rocking handle.

The utility model discloses an in the concrete scene of using, when the user needs the equipment the utility model discloses the time, the user is in the same place the parallel meshing of drive gear of each size earlier, and later the user aims at each drive gear's cross fixed slot 50 again and inserts the cross fixed axle from central shaft hole 40 to be in the same place each drive gear is fixed, thereby realize the equipment of variable speed transmission gear structure.

The utility model discloses in another application scene, because the teeth of a cogwheel in the tooth's socket 20 sets up for skewed tooth and straight-tooth combination, then the user still can be in the same place the transmission gear parallel and the perpendicular meshing of each size to realize the transmission of the parallel and perpendicular power of tooth's socket 20.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", 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 simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Claims (5)

1. A plastic transmission gear is characterized by comprising a transmission gear main body, a tooth socket, a fixed protrusion and a central shaft hole;

the tooth socket is arranged on the outer side of the transmission gear main body, the fixing protrusion is arranged in the center of the back side of the transmission gear main body, and the central shaft hole is arranged on the fixing protrusion;

the gear teeth in the tooth grooves are formed by combining helical teeth and straight teeth.

2. The plastic drive gear of claim 1, wherein said central axial bore has a diameter in the range of 4.90mm to 5 mm.

3. The plastic transmission gear according to claim 1, further comprising a central shaft hole and a cross fixing groove;

the cross fixing groove is arranged on the central shaft hole.

4. The plastic transmission gear according to claim 1, further comprising an eccentric shaft insertion hole;

the eccentric shaft insertion hole is provided at one side of the fixing protrusion.

5. The plastic transmission gear according to claim 1, wherein the transmission gear body, the straight and helical teeth combination teeth and tooth grooves, and the fixing protrusions are made of ABS or polypropylene.

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