Plastic steel gear

Abstract

The utility model relates to the technical field of hub motor gears, in particular to a plastic steel gear, which comprises a steel gear, a plastic gear sleeve, a first annular convex part and a second annular convex part, the plastic gear sleeve wraps the steel gear, the first annular convex part is integrally connected with the inner peripheral wall of the plastic gear sleeve, and the second annular convex part is connected with the inner peripheral wall of the plastic gear sleeve. The first annular convex part extends into a first groove formed in the teeth of the steel gear, the second annular convex part is integrally formed and connected with the inner side wall of the plastic gear sleeve, and the second annular convex part extends into a second groove formed in the outer side wall of the steel gear; the plastic steel gear is simple in structural design, high in integrity and obvious in noise reduction effect, and the teeth are not prone to being broken.

Description

Technical Field

[0001] This utility model relates to the field of hub motor gear technology, and in particular to a plastic steel gear. Background Technology

[0002] In-wheel motors, due to their high torque, place high demands on gears. Currently, in-wheel motor gears are either made of pure steel or pure plastic. Pure steel gears are noisy and require regular maintenance; while pure plastic gears reduce noise, the teeth are prone to breakage and require regular replacement. To combine the advantages of both pure steel and pure plastic, existing gears have a steel gear on each side of a plastic gear, and then fastened together with fasteners to form a complete gear. Although this type of gear has a certain noise reduction effect and the teeth are not prone to breakage, the structural design is complex, with many parts, poor overall integrity, and the noise reduction effect is still not ideal. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the existing technology and provide a plastic steel gear with simple structural design, strong integrity, obvious noise reduction effect, and teeth that are not easy to break.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a plastic steel gear, including a steel gear, a plastic gear sleeve, a first annular protrusion and a second annular protrusion, wherein the plastic gear sleeve wraps around the steel gear, the first annular protrusion is integrally formed and connected to the inner peripheral wall of the plastic gear sleeve, the first annular protrusion extends into the first groove opened in the teeth of the steel gear, the second annular protrusion is integrally formed and connected to the inner side wall of the plastic gear sleeve, and the second annular protrusion extends into the second groove opened in the outer side wall of the steel gear.

[0005] Furthermore, the groove depth of the first groove is between one-half and two-thirds of the radial height of the steel gear teeth.

[0006] Furthermore, the groove depth of the second groove is between one-sixth and one-fifth of the axial width of the steel gear.

[0007] Furthermore, the inner ring of the steel gear is aligned with the inner ring of the plastic gear sleeve.

[0008] Furthermore, the first annular protrusion has two parts, and the second annular protrusion has two parts.

[0009] Furthermore, the cross-sections of the first annular protrusion, the second annular protrusion, the first groove, and the second groove are rectangular.

[0010] Furthermore, the cross-sections of the first annular protrusion, the second annular protrusion, the first groove, and the second groove are trapezoidal.

[0011] The beneficial effects of this utility model are:

[0012] (1) In this utility model, the plastic tooth sleeve wraps around the steel gear, and the plastic tooth sleeve and the steel gear are fastened together by the first annular protrusion being embedded in the first groove and the second annular protrusion being embedded in the second groove. The structure is simple and has strong integrity. At the same time, since the plastic tooth sleeve wraps around the steel gear, the noise reduction effect is obvious, and the teeth are not easy to break, requiring no maintenance.

[0013] (2) In this utility model, the groove depth of the first groove is between one-half and two-thirds of the radial height of the steel gear teeth, which ensures the rigidity of the steel gear teeth and at the same time prevents the first annular protrusion from easily slipping out of the first groove.

[0014] (3) In this utility model, the groove depth of the second groove is between one-sixth and one-fifth of the axial width of the steel gear, which ensures the rigidity of the steel gear and at the same time prevents the second annular protrusion from easily slipping out of the second groove.

[0015] (4) In this utility model, the cross sections of the first annular protrusion, the second annular protrusion, the first groove and the second groove are trapezoidal, so that the first annular protrusion and the first groove and the second annular protrusion and the second groove are tightly engaged, further preventing the first annular protrusion from easily slipping out of the first groove and the second annular protrusion from easily slipping out of the second groove. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is an exploded view of the present invention;

[0018] Figure 2 This is a cross-sectional view of the present invention. Figure 1 ;

[0019] Figure 3 This is a cross-sectional view of the present invention. Figure 2 ;

[0020] Figure 4 This is a front view of the steel gear in this utility model;

[0021] Figure 5 This is a partial sectional view of the present invention.

[0022] In the diagram: 100, steel gear; 110, first groove; 120, second groove; 200, plastic gear sleeve; 300, first annular protrusion; 400, second annular protrusion. Detailed Implementation

[0023] The present invention will now be further described with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0024] Example 1

[0025] like Figures 1-4 As shown, a plastic-coated steel gear includes a steel gear 100, a plastic gear sleeve 200, a first annular protrusion 300, and a second annular protrusion 400. The plastic gear sleeve 200 encloses the steel gear 100. The first annular protrusion 300 is integrally formed and connected to the inner peripheral wall of the plastic gear sleeve 200. The first annular protrusion 300 extends into a first groove 110 formed in the teeth of the steel gear 100. The second annular protrusion 400 is integrally formed and connected to the inner sidewall of the plastic gear sleeve 200. The second annular protrusion 400 extends into a second groove 120 formed in the outer sidewall of the steel gear 100. Specifically, there are two first annular protrusions 300 and two second annular protrusions 400. The cross-sections of the first annular protrusion 300, the second annular protrusion 400, the first groove 110, and the second groove 120 are rectangular. The inner ring of the steel gear 100 is aligned with the inner ring of the plastic gear sleeve 200 to ensure that the plastic gear sleeve 200 fully encloses the steel gear 100.

[0026] The plastic gear sleeve 200 encloses the steel gear 100 and is embedded in the first groove 110 by the first annular protrusion 300 and the second annular protrusion 400 by the second groove 120, so as to achieve a tight connection between the plastic gear sleeve 200 and the steel gear 100. The structure is simple and has strong integrity. At the same time, since the plastic gear sleeve 200 encloses the steel gear 100, the noise reduction effect is obvious, and the teeth are not easy to break, requiring no maintenance.

[0027] like Figure 3 As shown, the groove depth S1 of the first groove 110 is between one-half and two-thirds of the radial height H of the teeth of the steel gear 100, which ensures the rigidity of the teeth of the steel gear 100 and at the same time prevents the first annular protrusion 300 from easily slipping out of the first groove 110.

[0028] like Figure 3 As shown, the groove depth S2 of the second groove 120 is between one-sixth and one-fifth of the axial width K of the steel gear 100, which ensures the rigidity of the steel gear 100 and at the same time prevents the second annular protrusion 400 from easily slipping out of the second groove 120.

[0029] Example 2

[0030] like Figure 5As shown, the difference between this embodiment and Embodiment 1 is that the cross-sections of the first annular protrusion 300, the second annular protrusion 400, the first groove 110, and the second groove 120 are trapezoidal, so that the first annular protrusion 300 is tightly engaged with the first groove 110 and the second annular protrusion 400 is tightly engaged with the second groove 120, further preventing the first annular protrusion 300 from easily slipping out of the first groove 110 and the second annular protrusion 400 from easily slipping out of the second groove 120.

[0031] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be covered within the protection scope of this utility model.

Claims

1. A plastic steel gear, characterized in that: The device includes a steel gear (100), a plastic gear sleeve (200), a first annular protrusion (300), and a second annular protrusion (400). The plastic gear sleeve (200) encloses the steel gear (100). The first annular protrusion (300) is integrally formed and connected to the inner peripheral wall of the plastic gear sleeve (200). The first annular protrusion (300) extends into the first groove (110) opened in the teeth of the steel gear (100). The second annular protrusion (400) is integrally formed and connected to the inner sidewall of the plastic gear sleeve (200). The second annular protrusion (400) extends into the second groove (120) opened in the outer sidewall of the steel gear (100).

2. The plastic steel gear according to claim 1, characterized in that: The groove depth of the first groove (110) is between one-half and two-thirds of the radial height of the teeth of the steel gear (100).

3. The plastic steel gear according to claim 1, characterized in that: The groove depth of the second groove (120) is between one-sixth and one-fifth of the axial width of the steel gear (100).

4. The plastic steel gear according to claim 1, characterized in that: The inner ring of the steel gear (100) is aligned with the inner ring of the plastic gear sleeve (200).

5. The plastic steel gear according to claim 1, characterized in that: The first annular protrusion (300) consists of two parts, and the second annular protrusion (400) consists of two parts.

6. The plastic steel gear according to claim 1, characterized in that: The cross-sections of the first annular protrusion (300), the second annular protrusion (400), the first groove (110), and the second groove (120) are rectangular.

7. The plastic steel gear according to claim 1, characterized in that: The cross-sections of the first annular protrusion (300), the second annular protrusion (400), the first groove (110), and the second groove (120) are trapezoidal.

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