CN109027130B

CN109027130B - Low-speed high-power marine engine timing chain

Info

Publication number: CN109027130B
Application number: CN201810976574.0A
Authority: CN
Inventors: 金玉谟; 李存志; 刘毅; 姜德鹏; 王魁; 刘涛
Original assignee: Qingdao Choho Industrial Co Ltd
Current assignee: Qingdao Choho Industrial Co Ltd
Priority date: 2018-08-25
Filing date: 2018-08-25
Publication date: 2020-09-25
Anticipated expiration: 2038-08-25
Also published as: CN109027130A

Abstract

The invention relates to a low-speed high-power marine engine timing chain, which comprises an inner chain link and an outer chain link, wherein the inner chain link is in interference fit with a sleeve, the sleeve is in clearance fit with a roller, the outer chain link is in interference fit with a pin shaft, and the inner chain link and the outer chain link are in clearance fit with the sleeve through the pin shaft and are mutually staggered and mutually embedded to form a whole chain. In the inner chain link, one side of the chain plate is provided with a meshing fillet, so that the abrasion and impact generated by the chain and the chain wheel can be avoided, the sleeve is subjected to a conical structural design and an assembled honing process, and the influence of the diameter shrinkage generated by interference fit on the wear resistance of the chain is avoided. The chain adopts the octagonal riveting mode, chain length detection is carried out on the basis of 10-20 sections at the initial stage of chain assembly, and the whole chain connection is carried out on the basis of the mode that the chain lengths at two sides are gradually shortened to the middle of the chain segment, so that the service performance of the large-specification chain under the low-speed heavy-load working condition is improved.

Description

Low-speed high-power marine engine timing chain

Technical Field

The invention relates to the technical field of chain transmission, in particular to a low-speed high-power marine engine timing chain.

Background

At present, a chain transmission system is widely applied to engine timing transmission, and is particularly embodied on a low-speed high-power marine engine. The timing chain is different from a common chain and the marine engine timing chain, and has higher requirements on reliability, fatigue performance, wear resistance and the like.

The fatigue performance of the large-sized chain is generally capable of meeting the requirements due to corresponding improvement in the aspects of materials, heat treatment and the like, but the wear resistance of the large-sized chain still does not reach the advanced foreign level. The main reason is that the influence of the diameter shrinkage generated by the interference fit of the sleeve on the pin shaft and even the whole chain is not considered, the effect is improved only by improving the hardness of the sleeve or the pin shaft, and the effect is not ideal. In the actual operation process of the chain, the friction of the shaft sleeve in conventional line contact is converted into the friction between the sleeve in the shape of a waist drum and the pin shaft, so that the mutual abrasion of parts is aggravated, and the chain is extended beyond the range to fail. In addition, in the meshing process of the chain and the chain wheel, due to load fluctuation changes, the tooth surfaces of the inner chain plate and the chain wheel possibly interfere, so that the chain wheel is abraded to different degrees, and normal meshing is influenced. Thus, conventional chain design methods or processes have not fully satisfied the requirements of marine engine timing chains.

Disclosure of Invention

Aiming at the technical defects, the invention provides the timing chain of the low-speed high-power marine engine, the conical design of the sleeve is carried out, the influence of the reduction of the diameter of the sleeve generated by interference fit on the wear resistance of the chain can be effectively avoided, the meshing fillet of the chain plate is reasonably designed, the chain segment length of the reference section number is matched and then the whole chain is riveted, the meshing stability of the chain system in the operation process is enhanced, and the service life of the chain is prolonged.

The technical scheme of the invention is as follows:

the timing chain of the low-speed high-power marine engine comprises an inner chain link and an outer chain link, wherein the inner chain link is in interference fit with a sleeve, the sleeve is in clearance fit with a roller, the outer chain link is in interference fit with a pin shaft, the pin shaft penetrates through the sleeve to realize staggered mutual embedding of the inner chain link and the outer chain link, and the whole chain is riveted after chain length matching is carried out by a plurality of sections of chain segments with fixed joint numbers.

Inner link board one side is equipped with the meshing fillet, and inner link board meshing fillet radius R, link board outside circular arc diameter D1 satisfy the relation with roller external diameter D2: r (70% -95%) × (D1-D2), the height of the engagement fillet of the inner chain plate is 20% -40% of the thickness of the chain plate, and mutual abrasion between the chain and the chain wheel in the engagement process can be avoided.

The sleeve adopts the design of both ends toper structure, and toper region length L satisfies the relation with sleeve height H: l ═ (20% to 35%) xh. The angle of the cone top in the conical structure is 0.1-0.5 degrees. The conical design of the sleeve can facilitate the control of the size range of the inner diameter reducing part and the non-reducing part of the sleeve when the inner chain link is assembled, and the honing allowance is controlled within 0.02mm-0.1 mm. Through the honing process, the cylindricity of the inner wall of the sleeve can reach 0.02mm, and the problems that the conventional chain is partially worn by the shaft sleeve due to the reduction of the diameter of the sleeve and the elongation of the chain at the initial stage is overlarge are solved to a great extent.

The chain adopts the octagonal riveting mode, so that interference magnitude of the chain plates and the pin shafts is uniformly distributed along the circumferential direction, and stress concentration is effectively avoided while the pressing force is ensured.

Chain length detection is carried out on the basis of 10-20 sections in the initial chain assembly stage, and the reference chain segments are connected in a whole chain mode in a mode that the chain lengths on two sides are gradually shortened to the middle.

Compared with the prior art, the invention has the beneficial effects that: on the premise of ensuring honing allowance, the conical design of the sleeve and the honing process after assembly eliminate the influence of conventional chain sleeve diameter reduction on the wear resistance of the chain, and introduce a large-specification chain length matching scheme, so that the practical production detection is facilitated, the meshing stability of a chain system is enhanced, and the use performance of the low-speed high-power marine engine timing chain is integrally improved.

Drawings

FIG. 1 is a front view of an assembly drawing of a low speed high power marine engine timing chain

FIG. 2 is a top view of an assembly drawing of an inner chain link of a timing chain of a low-speed high-power marine engine

FIG. 3 is a front view of an assembly drawing of an inner chain link of a timing chain of a low-speed high-power marine engine

FIG. 4 is a schematic view of a sleeve structure

FIG. 5 is a schematic diagram of the matching of the reference chain length of a timing chain of a low-speed high-power marine engine

Detailed Description

The invention will be further described with reference to the following description and examples in conjunction with the accompanying drawings: the utility model provides a high-power marine engine timing chain of low-speed, includes that inner link 2 and sleeve 3 interference fit and sleeve 3 and 5 clearance fit of roller form the inner chain link, outer link 1 and the outer chain link of round pin axle 4 interference fit formation, round pin axle 4 passes sleeve 3 and realizes that inner link and outer chain link are crisscross each other to inlay.

The engagement fillet radius R of the inner chain plate 2, the arc diameter D1 of the outer side of the chain plate and the outer diameter D2 of the roller 5 satisfy the following relations: r ═ (70% to 95%) x (D1-D2). The height h of the engaging fillet of the inner chain plate 2 is 20 to 40 percent of the thickness of the chain plate.

Sleeve 3 adopts the design of both ends toper structure, and toper region length L satisfies the relation with sleeve 3 height H: l ═ (20% to 35%) xh. The cone top angle theta in the conical structure is 0.1-0.5 deg. And (3) carrying out sleeve honing treatment after the inner chain links are assembled, wherein the honing allowance is ensured to be 0.02mm-0.1 mm. The chain adopts an octagonal riveting mode.

Due to the fact that the timing chain of the high-power marine engine is large in structure and high in actual production detection difficulty, a corresponding chain length matching scheme is introduced. Dividing the whole chain into a plurality of chain segments respectively by taking 10-20 sections as a reference for pre-tensioning and relevant detection, and recording the actual length of each chain segment. Each reference chain segment is numbered from small to large according to the actual length (such as the shortest chain is C1, …), and then the whole chain is connected in a mode that the chain length is gradually shortened to the middle.

Claims

1. The utility model provides a high-power marine engine timing chain of low-speed, includes inner plate, sleeve, roller, outer plate and round pin axle, its characterized in that: inner link board and sleeve interference fit, sleeve and roller clearance fit form the inner chain link, and outer link board and round pin axle interference fit form the outer chain link, and the round pin axle passes the sleeve and realizes that the inner chain link interlocks each other and inlays with the outer chain link, and whole chain carries out the chain length by the chain segment of the fixed festival number of multistage and matches the back and rivet again, and the benchmark chain segment carries out whole chain with the form that both sides chain length to middle shorten gradually and connects, and the sleeve adopts both ends toper structural design, and the regional length L of toper satisfies the relation with sleeve height H: and L is (20% -35%) multiplied by H, the cone top of the conical structure faces the middle part of the sleeve, the angle of the cone top in the conical structure is 0.1-0.5 degrees, sleeve honing treatment is carried out after the inner chain link is assembled, and the honing allowance is ensured to be 0.02-0.1 mm.

2. A low speed high power marine engine timing chain as claimed in claim 1, wherein: inner link board one side is equipped with the meshing fillet, and inner link board meshing fillet radius R, link board outside circular arc diameter D1 satisfy the relation with roller external diameter D2: r ═ (70% to 95%) x (D1-D2).

3. A low speed high power marine engine timing chain as claimed in claim 2, wherein: the height of the engaging fillet of the inner chain plate is 20 to 40 percent of the thickness of the chain plate.

4. A low speed high power marine engine timing chain as claimed in claim 1, wherein: the chain adopts an octagonal riveting mode.

5. A low speed high power marine engine timing chain as claimed in claim 1, wherein: chain length detection is carried out by taking 10-20 sections as a reference in the initial stage of chain assembly.