Lightweight chain wheel

Abstract

A light-weight chain wheel relates to the technical field of chain transmission and comprises an outer ring steel tooth profile part and an inner ring aluminum alloy part, a plurality of clamping grooves are evenly distributed on the inner edge of the outer ring steel tooth profile part around the axis, a plurality of clamping blocks are evenly distributed on the outer edge of the inner ring aluminum alloy part around the axis, the clamping grooves are in interference fit with the clamping blocks, and the clamping blocks are in interference fit with the clamping grooves. A plurality of reserved welding gaps are evenly distributed between the inner edge of the outer ring steel tooth profile part and the outer edge of the inner ring aluminum alloy part, and the welding gaps are welded in a brazing mode. According to the novel chain wheel, the matching relation and the connecting relation between the outer ring steel tooth profile part and the inner ring aluminum alloy part are improved, the assembly precision of the outer ring steel tooth profile part and the inner ring aluminum alloy part is effectively improved, light weight is guaranteed, meanwhile, the structural strength of the chain wheel is effectively improved, and therefore the running stability of a chain system is effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of chain transmission technology, in particular to a lightweight sprocket. BACKGROUND

[0002] With the rapid integration of technological innovation and manufacturing, the demand trend of high-strength, individualization and lightweight of chain transmission system is penetrating into various industries. Especially in the field of motorcycle transmission, high-strength, individualization and lightweight have become the focus of users, and major motorcycle manufacturers are developing in these directions to meet the increasingly diversified market demand and user expectations.

[0003] At present, the widely popular sprocket on the market is mainly divided into two categories: steel sprocket and ordinary steel clad aluminum sprocket. The ordinary steel clad aluminum sprocket is an iterative product of the steel sprocket, which plays a role in lightweight to some extent. The outside is a steel gear ring, and the inside is an aluminum alloy. The two are connected by a number of evenly distributed rivets. This way does not pay attention to the matching relationship of the two, and mainly relies on the rivets to limit the axial and radial load impact. In the actual practical process, due to the long-term effect of alternating load, the rivet connection part is prone to looseness, which causes the external gear ring and the internal aluminum alloy to separate, and there is a certain safety hazard. CONTENT OF THE INVENTION

[0004] The present application discloses a lightweight sprocket, which improves the matching relationship and connection relationship between the outer ring steel tooth profile part and the inner ring aluminum alloy part, effectively improves the assembly accuracy of the outer ring steel tooth profile part and the inner ring aluminum alloy part, ensures lightweight, effectively improves the structural strength of the sprocket, and effectively improves the stability of the chain system operation.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0006] A lightweight sprocket, comprising an outer ring steel tooth profile part and an inner ring aluminum alloy part, the inner edge of the outer ring steel tooth profile part is uniformly distributed with a plurality of clamping grooves around the axis, the outer edge of the inner ring aluminum alloy part is uniformly distributed with a plurality of clamping blocks around the axis, the clamping grooves and the clamping blocks are interference fit, and a plurality of reserved welding gaps are uniformly distributed between the inner edge of the outer ring steel tooth profile part and the outer edge of the inner ring aluminum alloy part, and are welded by brazing at the welding gap.

[0007] Preferably, the inner ring aluminum alloy part comprises an inner ring, an outer ring and a connecting rod which are integrally formed, the clamping blocks are uniformly distributed on the outer edge of the outer ring, a plurality of connecting rods formed by hollowing are uniformly arranged between the inner edge of the outer ring and the outer edge of the inner ring, and a plurality of assembly holes are uniformly distributed on the outer edge of the inner ring around the axis.

[0008] Preferably, the welding gap is opened at the inner edge of the outer ring steel tooth profile part or the outer edge of the inner ring aluminum alloy part, or the welding gap is opened at the inner edge of the outer ring steel tooth profile part and the outer edge of the inner ring aluminum alloy part respectively.

[0009] Preferably, the welding gap has a width of 0.1-0.15mm along the circumferential tangent direction of the sprocket, and the depth h of the welding gap and the thickness H of the outer ring steel tooth profile part satisfy the relationship: h=(3%-5%)*H.

[0010] Preferably, the interference amount between the clamping block and the clamping groove is less than or equal to 0.04mm.

[0011] Preferably, the minimum radial thickness S of the outer ring steel tooth profile part is formed between the tooth root of the outer ring steel tooth profile part and the bottom of the clamping groove, and the S is in the range of 6-10mm.

[0012] Preferably, the outer surface of the inner ring aluminum alloy part is provided with an anodized layer or a baking paint layer.

[0013] Preferably, the outer ring steel tooth profile part is a structure subjected to aging treatment.

[0014] The light-weight sprocket has the following beneficial effects:

[0015] The light-weight sprocket effectively improves the assembly precision of the outer ring steel tooth profile part and the inner ring aluminum alloy part by improving the cooperation and connection relationship between the outer ring steel tooth profile part and the inner ring aluminum alloy part, ensures the light weight, effectively improves the structural strength of the sprocket, and effectively improves the stability of the chain system operation. According to actual measurement verification, the weight of the sprocket is reduced by more than 20% compared with the steel sprocket with the same structure, and the connection firmness is improved by about 15% compared with the traditional steel clad aluminum sprocket. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the present application, the following briefly introduces the drawings needed in the embodiments, and constitutes a part of the specification, together with the embodiments of the present application, for explaining the present application, and does not constitute a limitation on the present application.

[0017] Figure 1 is a front view of a light-weight sprocket;

[0018] Figure 2 is a finished product drawing of the outer ring steel tooth profile part;

[0019] Figure 3 is a local section view schematic diagram of the brazing gap.

[0020] 1. Outer ring steel tooth profile; 2. Inner ring aluminum alloy; 3. Welding seam; 4. Inner ring; 5. Outer ring; 6. Connecting rod; 7. Assembly hole; 8. Locking block; 9. Locking groove. Detailed Implementation

[0021] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] The following embodiments can be understood as explaining a partial structure of the present invention individually, or as explaining a larger structure of the present invention through a combination of multiple embodiments.

[0023] Example 1

[0024] A lightweight sprocket, such as Figure 1 As shown, it includes an outer ring steel tooth profile portion 1 and an inner ring aluminum alloy portion 2. The inner edge of the outer ring steel tooth profile portion 1 has a plurality of slots 9 evenly distributed around the axis, and the outer edge of the inner ring aluminum alloy portion 2 has a plurality of locking blocks 8 evenly distributed around the axis. The slots 9 and the locking blocks 8 are interference fit. There are also a plurality of reserved welding gaps 3 evenly distributed between the inner edge of the outer ring steel tooth profile portion 1 and the outer edge of the inner ring aluminum alloy portion 2, and the welding gaps 3 are brazed together.

[0025] Example 2

[0026] like Figure 1 As shown, the inner aluminum alloy part 2 includes an integrally formed inner ring 4, an outer ring 5, and a connecting rod 6. The locking blocks 8 are evenly distributed on the outer edge of the outer ring 5. A number of connecting rods 6 formed by hollowing are evenly arranged between the inner edge of the outer ring 5 and the outer edge of the inner ring 4. The outer edge of the inner ring 4 has a number of assembly holes 7 evenly distributed around the axis.

[0027] Example 3

[0028] like Figure 1 , 3 As shown, the welding gap 3 is opened on the inner edge of the outer ring steel tooth profile portion 1 or the outer edge of the inner ring aluminum alloy portion 2, or the two ends of the radial direction of the welding gap 3 are respectively opened on the inner edge of the outer ring steel tooth profile portion 1 and the outer edge of the inner ring aluminum alloy portion 2.

[0029] Example 4

[0030] like Figure 1 , 3As shown, the width of the weld gap 3 along the tangent direction of the sprocket circumference is 0.1-0.15mm, and the depth h of the weld gap 3 and the thickness H of the outer steel tooth profile 1 satisfy the relationship: h = (3%~5%) * H.

[0031] Example 5

[0032] like Figure 1 As shown, the interference fit between the card block 8 and the card slot 9 is less than or equal to 0.04 mm.

[0033] like Figure 2 As shown, the minimum radial thickness S of the outer ring steel tooth profile portion 1 is formed between the tooth root and the bottom of the slot 9, and the S is in the range of 6 to 10 mm.

[0034] Example 6

[0035] like Figure 1 As shown, the outer surface of the inner aluminum alloy part 2 is provided with an anodized layer or a baked paint layer.

[0036] like Figure 2 As shown, the outer steel tooth profile is a structure that has undergone aging treatment.

Claims

1. A lightweight sprocket characterized by: The outer ring steel tooth profile part is provided with a plurality of clamping grooves uniformly distributed on the inner edge thereof around the axis, the inner ring aluminum alloy part is provided with a plurality of clamping blocks uniformly distributed on the outer edge thereof around the axis, the clamping grooves and the clamping blocks are in interference fit, and a plurality of reserved welding gaps are uniformly distributed between the inner edge of the outer ring steel tooth profile part and the outer edge of the inner ring aluminum alloy part, and the outer ring steel tooth profile part and the inner ring aluminum alloy part are welded by brazing at the welding gaps.

2. A light weight sprocket as claimed in claim 1 characterized in that: The inner ring aluminum alloy part comprises an integral inner ring, an outer ring and connecting rods, the clamping blocks are uniformly distributed on the outer edge of the outer ring, the inner edge of the outer ring and the outer edge of the inner ring are uniformly provided with a plurality of connecting rods formed by hollowing, and the outer edge of the inner ring is uniformly provided with a plurality of assembly holes around the axis.

3. A light weight chain wheel as claimed in claim 1 characterized in that: The welding gap is provided on the inner edge of the outer ring steel tooth profile part or the outer edge of the inner ring aluminum alloy part, or the two ends of the welding gap in the radial direction are respectively provided on the inner edge of the outer ring steel tooth profile part and the outer edge of the inner ring aluminum alloy part.

4. A lightened chain wheel as claimed in claim 1, characterized in that: The width of the welding gap in the circumferential tangent direction of the sprocket is 0.1-0.15mm, and the depth h of the welding gap and the thickness H of the outer ring steel tooth profile part satisfy the relationship: h=(3%-5%)*H.

5. A light weight sprocket as claimed in claim 1 characterized in that: The interference amount of the clamping block and the clamping groove is less than or equal to 0.04mm.

6. A lightened chain wheel as claimed in claim 1, characterized in that: The minimum radial thickness S of the outer ring steel tooth profile part is formed between the tooth root of the outer ring steel tooth profile part and the bottom of the clamping groove, and the S is in the range of 6-10mm.

7. A lightened chain wheel as claimed in claim 1, characterized in that: The outer surface of the inner ring aluminum alloy part is provided with an anodized layer or a baked paint layer.

8. A lightened chain wheel as claimed in claim 1, characterized in that: The outer ring steel tooth profile part is subjected to aging treatment.

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