装载机变速箱油管密封结构

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By employing a combined sealing structure of conical sealing holes inside the gearbox oil pipe and O-rings, cone sleeves, and pipe sleeves, the problem of reduced sealing performance caused by oxidation and rust at the oil pipe joints is solved, achieving a reliable sealing effect in harsh environments.

CN224515864UActive Publication Date: 2026-07-17LONGGONG FUJIAN QIAOXIANG CO LTD

Patent Information

Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner: LONGGONG FUJIAN QIAOXIANG CO LTD
Filing Date: 2025-07-09
Publication Date: 2026-07-17

AI Technical Summary

Technical Problem

Existing loader gearbox oil pipes are prone to oxidation and rust due to long-term exposure to the outdoors, resulting in decreased sealing performance, especially prone to leakage in high-pressure oil environments.

Method used

The design incorporates a conical sealing hole and an internal threaded hole within the housing, combined with an O-ring, a conical sleeve, and a pipe sleeve to form a two-stage sealing structure, including an O-ring conical seal and a chamfered conical seal, ensuring a good sealing effect.

Benefits of technology

It maintains good sealing performance in harsh environments, avoids the decline in sealing performance caused by oxidation and rust, has a simple and compact structure, and is reliable in use.

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Abstract

本实用新型公开了一种装载机变速箱油管密封结构：锥套左边段加工成圆锥面，在锥面上设O型圈槽，右边段为水平管，左右两段通过倒角面过渡；箱体内设包括圆锥面密封孔和内螺纹孔的油管接孔，该锥面密封孔与O型圈和锥套的锥面配合，形成O型圈锥面密封结构；管套套入钢管油管，钢管油管套入该水平管内孔并焊接固定；管套通过外螺纹与箱体内螺纹孔配合，管套内孔与锥套的水平管外表面之间采用间隙配合，管套左端的倒角面与锥套的倒角面配合，形成锥面密封结构。本实用新型构简单紧凑、密封效果好、在耐恶劣环境下使用可靠，解决了现有钢管油管通过管接头与箱体或操纵阀连接时因管接头长期暴露户外容易氧化生锈导致管接头螺纹密封性能下降的问题。

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Claims

1. A loader transmission housing oil line seal structure comprising a housing (1) and a steel tube oil line (5), characterized in that, It also includes an O-ring (2), a conical sleeve (3), and a tube sleeve (4). The left side of the conical sleeve (3) is machined into a conical surface, and an O-ring groove for assembling the O-ring (2) is provided on the conical surface. The right side is a horizontal tube, and the left and right sides are transitioned by a chamfered surface. The housing (1) is provided with an oil pipe connection hole including a conical surface sealing hole and an internal thread hole. The conical surface sealing hole mates with the conical surface of the O-ring (2) and the conical sleeve (3) to form an O-ring conical surface sealing structure. The tube sleeve (4) is fitted into a steel pipe oil pipe (5), and the steel pipe oil pipe (5) is fitted into the inner hole of the horizontal tube and welded and fixed. The tube sleeve (4) mates with the internal thread hole of the housing (1) through an external thread. The inner hole of the tube sleeve (4) and the outer surface of the horizontal tube on the right side of the conical sleeve (3) are fitted with a clearance fit. The chamfered surface at the left end of the tube sleeve (4) mates with the chamfered surface of the conical sleeve (3) to form a conical surface sealing structure.

2. The loader transmission oil line seal arrangement of claim 1, wherein, The taper of the left conical section of the cone sleeve (3) is 20° to 30°.

3. The loader transmission tube seal arrangement of claim 1, wherein, The chamfer of the chamfered surfaces of the tapered sleeve (3) and the sleeve (4) is 45°.