Large end cover screwed plug assembling structure of gearbox of 3-ton loader

Abstract

The utility model discloses a large end cover and screwed plug assembling structure of a gearbox of a 3-ton loader. The large end cover and screwed plug assembling structure comprises a large end cover and a screwed plug, the large end cover is provided with six deep hole oil ducts, and the machining starting parts of the six deep hole oil ducts of the large end cover are bosses formed by casting; counter bores are formed in the positions, located at the front ends of the deep-hole oil ducts, of the boss, and screwed plug threaded holes are machined in the front ends of the deep-hole oil ducts; the number of the screwed plugs is six, and the screwed plugs are assembled and locked in the corresponding screwed plug threaded holes respectively. The utility model has the advantages of simple and compact structure, convenience and high efficiency in processing and assembling and reliable product quality, and solves the problems that the large end cover oil duct deep hole is easy to deviate and the plug assembly guidance quality is poor in the prior art.

Description

Technical Field

[0001] The utility model relates to the technical field of a large end cover assembly of a loader gearbox, in particular to a threaded plug assembly structure of a large end cover of a 3-ton loader gearbox. Background Art

[0002] With the rapid development of the domestic construction machinery industry, competition in the construction machinery industry has become increasingly fierce. The industry has higher and higher requirements for product quality reliability and production efficiency. The gearbox is the core component of the loader transmission system. The gear oil channel of the 3-ton loader gearbox is complex. It is necessary to drill deep holes on the circumferential surface of the large end cover to process the oil channels of each gear, and then use plugs to plug the processing holes; because the deep holes of the oil channels and the threaded holes of the plugs are processed on the circumferential inclined surface, there is a problem that the oil channels deviate from the theoretical coordinate position when processing the deep holes, which affects the product quality. The second problem is that when processing the threaded holes of the plugs, the front end of the threaded holes is incomplete, resulting in poor assembly guidance of the plugs. Summary of the invention

[0003] The utility model aims to provide a 3-ton loader gearbox big end cover thread plug assembly structure which has a simple and compact structure, is convenient and efficient to process and assemble, and has reliable product quality, so as to solve the problems in the prior art that the deep holes of the big end cover oil passages are easily drilled off-center and the thread plug assembly has poor guiding performance.

[0004] To achieve the above purpose, the utility model of a 3-ton loader gearbox big end cover threaded plug assembly structure comprises a big end cover 1 and a threaded plug 6; the big end cover 1 is provided with six deep hole oil passages 5, and the processing starting position of the six deep hole oil passages 5 of the big end cover 1 is a cast boss 2; the boss 2 is located at the front end of each deep hole oil passage 5 and is provided with a countersunk hole 3, and the front end of each deep hole oil passage 5 is processed with a threaded plug hole 4; there are six threaded plugs 6, each of which is assembled and locked on the corresponding threaded plug hole 4.

[0005] The above-mentioned 3-ton loader gearbox big end cover plug assembly structure has the following technical features and beneficial effects by adding a boss on the circumferential surface of the big end cover oil passage:

[0006] 1. Adding oil channel countersinks during processing solves the problem of drilling oil channel deep holes on the circumferential inclined surface in the existing technology, which leads to drilling deviation and improves product quality and qualification rate;

[0007] 2. Adding a countersink at the front end of the deep hole oil channel ensures the integrity of the threaded hole of the screw plug, and the screw plug assembly has good guidance and high assembly efficiency.

[0008] 3. Simple and compact structure, low production and maintenance costs, and reliable use. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1The utility model is a main sectional schematic diagram of a screw plug assembly structure of a large end cover of a gearbox of a 3-ton loader.

[0010] Figure 2 The utility model is a top view schematic diagram of a screw plug assembly structure of a large end cover of a gearbox of a 3-ton loader.

[0011] Figure numerals: large end cover 1, boss 2, countersunk hole 3, threaded hole with screw plug 4, deep hole oil passage 5, screw plug 6. DETAILED DESCRIPTION

[0012] The following is a further detailed description of the screw plug assembly structure of the large end cover of a 3-ton loader gearbox according to the utility model in conjunction with the accompanying drawings and specific embodiments.

[0013] Figure 1 , Figure 2 As shown, the utility model 3-ton loader gearbox big end cover thread plug assembly structure comprises a big end cover 1 and a thread plug 6; the big end cover 1 is provided with six deep hole oil passages 5, and the processing starting part of the six deep hole oil passages 5 of the big end cover 1 is a cast boss 2; the boss 2 is located at the front end of each deep hole oil passage 5 and is provided with a countersunk hole 3, and the front end of each deep hole oil passage 5 is processed with a threaded hole 4 for threading a thread plug; six thread plugs 6 are provided, and each is assembled and locked on the corresponding threaded hole 4 for threading a thread plug.

[0014] During processing and assembly, a boss 2 is cast at the processing start position of the six deep hole oil passages 5 of the large end cover 1. Before processing the six deep hole oil passages 5, a countersink 3 is first processed at the front end of each deep hole oil passage 5, and then each deep hole oil passage 5 and the threaded hole 4 of the plug are processed; since the countersink 3 is processed first, when processing the deep hole oil passage 5, the tool is perpendicular to the processing surface, and there is no problem of drilling deviation; at the same time, since the axis of the threaded hole 4 of the plug is perpendicular to the countersink surface, the integrity of the threaded hole can be effectively guaranteed. In the assembly stage, the six plugs 6 are assembled and locked on the corresponding threaded holes 4 of the plug.

[0015] The utility model solves the problems of drilling deviation during deep hole processing of the oil channel and poor guiding property of the plug assembly in the prior art by adding a boss 2 on the circumferential surface of the oil channel of the big end cover 1 and adding an oil channel countersunk hole 3 during processing, thereby improving product quality and assembly efficiency.

Claims

1. A 3-ton loader gearbox large end cover thread plug assembly structure, comprising a large end cover (1) and a thread plug (6), wherein the large end cover (1) is provided with six deep hole oil passages (5); wherein: The processing starting point of the six deep hole oil passages (5) of the large end cover (1) is a cast boss (2); the boss (2) is provided with a countersunk hole (3) at the front end of each deep hole oil passage (5), and the front end of each deep hole oil passage (5) is processed with a threaded hole (4) for threaded plugs; six threaded plugs (6) are provided, each of which is assembled and locked on a corresponding threaded hole (4).

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