TWM623898U - compound gear - Google Patents

Abstract

A composite gear includes a main body and a composite body. The main body is made of metal, and has a base ring wall and two side ring walls that extend radially outward from opposite sides of the base ring wall and are spaced apart from each other. The base ring wall and the side ring walls jointly form A ring groove. The composite body is made of plastic and is filled in the ring groove and fixed in combination with the main body. Wherein, the side ring walls and the outer peripheral surface of the composite body together form a plurality of tooth portions arranged in the circumferential direction. By covering the plastic composite body with the metal main body, the weight can be reduced by about 60% compared with the existing all-metal gear, and the noise during transmission can be reduced, and compared with the existing all-plastic gear Gearing increases torque and reduces the risk of tooth angle breakage.

Description

compound gear

The new model relates to a gear, especially a composite gear made of metal and plastic.

Gears are common parts in mechanical transmission equipment, especially important parts in reducers, and mechanical equipment using reducers, such as treadmills, mixers, car electric windows, electric window screen machines, electric bicycles, etc., are widely used.

Generally, there are many gears in the reducer. However, most of the existing gears are made of metal and are heavy, which increases the overall weight of the reducer, thereby increasing the weight of the mechanical equipment on which the reducer is installed. Existing gears are also made of plastic. Although the weight can be reduced compared to metal gears, plastic gears are prone to problems such as insufficient torque and easy breakage of tooth angles or wear of tooth surfaces.

Therefore, one objective of the present invention is to provide a compound gear that can solve the aforementioned problems.

Therefore, in some embodiments, the novel composite gear includes a main body and a composite body. The main body is made of metal, and has a base ring wall and two side ring walls that extend radially outward from opposite sides of the base ring wall and are spaced apart from each other. The base ring wall and the side ring walls jointly form A ring groove. The composite body is made of plastic and is filled in the ring groove and fixed in combination with the main body. Wherein, the side ring walls and the outer peripheral surface of the composite body together form a plurality of tooth portions arranged in the circumferential direction.

In some embodiments, the main body further has a plurality of grooves formed in at least one of the base ring wall and the side ring walls, the grooves communicate with the ring groove and are filled and combined with the composite body .

In some embodiments, the grooves are formed on the base ring wall and are spaced apart along the circumferential direction.

In some embodiments, the main body further has a ring baffle wall protruding from the inner ring surface of the base ring wall and adjacent to one of its side edges in a radial direction toward the center, and an inner ring from the base ring wall a radially concave annular groove adjacent to the other side edge, the compound gear also includes a bearing accommodated in the base ring wall and abutting against the base ring wall and the ring retaining wall, and a bearing A stopper placed in the annular groove, the stopper and the annular stop wall together limit the bearing in the axial direction.

In some embodiments, the stopper is a C-shaped spring.

In some embodiments, the main body further has a clamping groove formed on the inner annular surface of the base ring wall for clamping a drive shaft.

The new model has the following functions: the metal body wraps the plastic composite body, which can reduce the weight compared with the existing all-metal gear, which can reduce the weight by about 60%, and can reduce the noise during transmission. Compared with existing all-plastic gears, it can increase torque and reduce the risk of tooth breakage or tooth surface wear.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are designated by the same reference numerals.

Referring to FIGS. 1 to 3 , the first embodiment of the novel composite gear 1 is suitable for use as a driven gear, and includes a main body 2 , a composite body 3 , a bearing 4 and a stopper 5 .

The main body 2 is made of metal, such as steel, stainless steel, etc., and has a base ring wall 21 and two side ring walls 22 extending radially outward from opposite sides of the base ring wall 21 and spaced apart from each other. The base ring wall 21 and the side ring walls 22 together form a ring groove 23 . The composite body 3 is made of plastic and is filled in the annular groove 23 to be fixed with the main body 2 . Wherein, the side ring walls 22 and the outer peripheral surface of the composite body 3 together form a plurality of tooth portions 11 arranged in the circumferential direction.

In this embodiment, the composite body 3 is made of engineering plastics, and is fixed with the main body 2 by injection molding. Figures 2 and 3 show the state of the main body 2 before it is combined with the composite body 3. The main body 2 also has a plurality of grooves 24 formed on the base ring wall 21 and arranged at intervals along the circumferential direction. The groove 24 is communicated with the annular groove 23 and is used for the composite body 3 to be filled and combined, thereby making the combination of the composite body 3 and the main body 2 more stable and preventing the composite body 3 from twisting relative to the main body 2 . Heart slides. In alternative embodiments, the grooves 24 may also be formed in the side ring walls 22 . After the composite body 3 and the main body 2 are injection-molded, the teeth 11 are formed by CNC machining. In this embodiment, the compound gear 1 is illustrated as a spur gear, but it can be understood that the shape of the compound gear 1 can be adjusted according to the needs of use, for example, a straight bevel gear, a curved bevel gear can also be formed. Gears, halberd gears, helical gears, herringbone gears, worm gears, etc.

In this embodiment, the main body 2 also has a ring baffle wall 25 protruding radially toward the center from the inner annular surface of the base ring wall 21 and adjacent to one of its side edges, and a ring stop wall 25 from the base ring wall 21 The inner ring surface of the ring groove 26 is adjacent to the radially concave ring groove 26 at the other side edge. The bearing 4 is accommodated in the base ring wall 21 and abuts against the base ring wall 21 and the ring blocking wall 25 . The stopper 5 is accommodated in the annular groove 26 and together with the annular baffle wall 25 limits the bearing 4 in the axial direction, so that the bearing 4 cannot be separated from the main body 2 . In this embodiment, the stopper 5 is a C-shaped spring. When assembling, first put the bearing 4 into the base ring wall 21 and make the bearing 4 abut against the ring blocking wall 25 , and then elastically compress the blocking member 5 from both ends to make the blocking member 5 After reducing the diameter of the ring groove 26, the stopper 5 can be positioned in the ring groove 26 and the bearing 4 can be limited after the stopper 5 is released to make it elastically reset.

Referring to FIG. 4 , the second embodiment of the novel compound gear 1 is suitable for use as a driving gear. The difference from the first embodiment is that the bearing 4 and the stopper 5 are not provided, but in the second embodiment, the main body 2 also has a clamping groove 27 formed on the inner annular surface of the base ring wall 21 for a driving shaft (not shown) to be clamped.

To sum up, by covering the plastic composite body 3 with the metal main body 2, the weight can be reduced by about 60% compared with the existing all-metal gears, and the noise during transmission can be reduced, and the Compared with the existing all-plastic gear, the torque can be increased and the risk of the tooth portion 11 being broken or the surface of the tooth portion 11 being worn is reduced.

However, the above are only examples of the present invention, which should not limit the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the scope of the patent application for this new model and the contents of the patent specification are still within the scope of the present invention. within the scope of this new patent.

1: Compound gear

11: Teeth

2: Subject

21: base ring wall

22: Side ring wall

23: Ring groove

24: Groove

25: Ring retaining wall

26: Ring groove

27: Card slot

3: Complex

4: Bearing

5: Stopper

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, wherein: Fig. 1 is the perspective view of the first embodiment of the novel compound gear; 2 is a perspective view of the main body of the first embodiment in a state before the composite body is not bonded; FIG. 3 is a perspective view corresponding to FIG. 2 from different perspectives; and Figure 4 is a side view of a second embodiment of the novel compound gear.

1: Compound gear

11: Teeth

2: Subject

3: Complex

4: Bearing

5: Stopper

Claims (6)

A composite gear, comprising: a main body, made of metal, with a base ring wall and two side ring walls extending radially outward from opposite sides of the base ring wall and spaced apart from each other, the base ring wall and The side ring walls together form a ring groove; and a composite body is made of plastic and is filled in the ring groove and fixed with the main body; wherein, the side ring walls and the outer peripheral surface of the composite body together form a circumferential direction Arranged multiple teeth. The compound gear of claim 1, wherein the main body further has a plurality of grooves formed in at least one of the base ring wall and the side ring walls, the grooves communicate with the ring groove and are used for the The complex fills the binding. The compound gear of claim 2, wherein the grooves are formed on the base ring wall and are spaced apart in the circumferential direction. The compound gear according to claim 1, wherein the main body further has a ring baffle wall protruding radially toward the center from the inner ring surface of the base ring wall and adjacent to one of the side edges, and a ring stop wall from the base ring The inner annular surface of the wall is adjacent to a radially concave annular groove at the other side edge of the wall, and the compound gear further comprises a The bearing and a stop piece accommodated in the annular groove, the stop piece and the annular stop wall jointly limit the bearing in the axial direction. The compound gear of claim 4, wherein the stopper is a C-shaped spring. The compound gear of claim 1, wherein the body further has a formed A clamping groove on the inner annular surface of the base ring wall is used for clamping a drive shaft.

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