CN219045427U

CN219045427U - Single-cylinder motorcycle engine crankshaft lubricating system

Info

Publication number: CN219045427U
Application number: CN202223530447.9U
Authority: CN
Inventors: 施咚咚; 郭文财; 丁少强
Original assignee: Fujian Jinjiang Sanli Engine Co ltd
Current assignee: Fujian Jinjiang Sanli Engine Co ltd
Priority date: 2022-12-29
Filing date: 2022-12-29
Publication date: 2023-05-19
Anticipated expiration: 2032-12-29

Abstract

The utility model provides a crankshaft lubrication system of a single-cylinder motorcycle engine, which comprises a crankshaft left half shaft, a left bearing, 2 crankshaft pin plugs, a crankshaft pin, a connecting rod, a needle bearing, a crankshaft right half shaft and a right bearing, wherein the crankshaft pin is arranged in the crankshaft right half shaft, the needle bearing is sleeved outside the crankshaft pin, the connecting rod is sleeved outside the needle bearing, the left bearing and the right bearing are pressed with the crankshaft left half shaft and the crankshaft right half shaft through interference fit, an oil passage a is arranged in the crankshaft right half shaft, an oil passage b is arranged in the crankshaft right half shaft, the oil passage a is communicated with the oil passage b through an oil passage c arranged in the crankshaft right half shaft and the crankshaft pin, the left end and the right end of the oil passage b are respectively plugged through the crankshaft pin plugs at two sides, a plurality of radial oil passages d which are communicated with the needle bearing are evenly distributed at two sides of the oil passage b. The engine oil of the crankshaft lubrication system fully covers the needle bearing and the connecting rod, so that the lubrication effect is improved.

Description

Single-cylinder motorcycle engine crankshaft lubricating system

Technical Field

The utility model belongs to the technical field of engines, and particularly relates to a crankshaft lubrication system of a single-cylinder motorcycle engine.

Background

When the engine works, friction surfaces (such as a crankshaft journal and a bearing, a camshaft journal and a bearing, a piston ring and a cylinder wall, a timing gear pair and the like) do relative motion at a high speed, and friction between metal surfaces not only increases power consumption in the engine, but also causes the working surfaces of parts to be worn rapidly; the heat generated by friction may also melt certain work piece surfaces, causing the engine to fail. Therefore, in order to ensure the normal operation of the engine, the surfaces of the relatively moving parts in the engine must be lubricated, that is, a layer of lubricant (engine oil or grease) is covered on the friction surface, so that a thin oil film is arranged between the metal surfaces, thereby reducing friction resistance, reducing power loss, reducing wear and prolonging the service life of the engine.

The crankshaft of the single-cylinder motorcycle engine is overweight and overloaded by operators, and meanwhile, the connecting rod bearing is extremely easy to burn for a plurality of times due to insufficient lubricating force, the supporting force of the burning part is weakened, abnormal sound is serious, abrasion is aggravated, and the normal service life is greatly shortened. If this occurs, the crankshaft assembly needs to be replaced in order for the engine to function properly. And the crankshaft assembly is replaced, so that the operation is complex, the price is high, and great waste is caused.

In the existing crankshaft lubricating system on the market at present, only two oil passages connected between a crank pin and a needle bearing are symmetrically arranged, so that the lubricating effect is quite unsatisfactory.

Disclosure of Invention

The technical problems to be solved are as follows: aiming at the defects existing in the prior art, the utility model provides a crankshaft lubrication system of a single-cylinder motorcycle engine, engine oil of the crankshaft lubrication system fully covers a needle bearing and a connecting rod, and the lubrication effect is improved.

The technical scheme is as follows: the utility model provides a single cylinder motorcycle engine crankshaft lubricating system, includes left half axle, left bearing, 2 crankpin plugs, crankpin, connecting rod, bearing, right half axle, right bearing, the crankpin sets up in the right half axle of bent axle, and the bearing cover is established in the crankpin outside, and the connecting rod cover is established in the bearing outside, and left bearing, right bearing press-fit with left half axle, the right half axle of bent axle through interference fit, be provided with oil duct a in the right half axle of bent axle, be provided with oil duct b in the crankpin, oil duct a communicates through the oil duct c that sets up in right half axle, crankpin, both ends are respectively through the crankpin plug shutoff of both sides about oil duct b, be provided with the radial oil duct d of intercommunication oil duct b and bearing in the crankpin, the several oil duct d is equally divided into two sets of symmetry and is set up in oil duct b both sides.

The number of the oil channels d is 4-8, and the number of each group is 2-4.

The number of the oil channels d is 8, and the number of each group is 4.

The centers of the oil channels in the same group on the outer surface of the crank pin are positioned on the same straight line, and the included angle between the straight line and the axis of the crank pin is 15 degrees.

The diameters of the oil channels positioned in the same group on the outer surface of the crank pin are sequentially increased from two sides inwards.

The beneficial effects are that: the crankshaft lubrication system of the single-cylinder motorcycle engine provided by the utility model has the following beneficial effects:

1. according to the utility model, the engine oil enters the crank pin from the crank left half shaft oil duct, the needle bearing and the connecting rod are lubricated in a radial radiation mode, and in the running process, the engine oil forms a large-area oil film, is partially overlapped and fully covers the needle bearing and the connecting rod, so that the lubricating effect is improved;

2. the crankshaft lubrication system can prolong the service life of the crankshaft by more than 30 percent.

Drawings

FIG. 1 is a cross-sectional view of a crankshaft lubrication system of the present utility model;

FIG. 2 is a schematic view of the crankpin structure, wherein the internal structure is not shown;

FIG. 3 is a cross-sectional view taken along the A-A plane in FIG. 2;

FIG. 4 is a schematic view of the crankpin structure, wherein the internal structure is depicted;

FIG. 5 is a cross-sectional view taken along the B-B plane in FIG. 4;

in the figure: 1. a left half shaft of the crankshaft; 2. a left bearing; 3. crank pin plug; 4. crank pin; 5. a connecting rod; 6. needle roller bearings; 7. a crankshaft right half shaft; 8. a right bearing; 9. an oil passage a; 10. an oil passage b; 11. an oil passage c; 12. and an oil passage d.

Detailed Description

The embodiment provides a crankshaft lubrication system of a single-cylinder motorcycle engine, which comprises a crankshaft left half shaft 1, a left bearing 2, 2 crankpin plugs 3, a crankpin 4, a connecting rod 5, a crankpin bearing 6, a crankshaft right half shaft 7 and a right bearing 8, wherein the crankpin 4 is arranged in the crankshaft right half shaft 7, the crankpin bearing 6 is sleeved outside the crankpin 4, the connecting rod 5 is sleeved outside the crankpin bearing 6, the left bearing 2 and the right bearing 8 are pressed with the crankshaft left half shaft 1 and the crankshaft right half shaft 7 through interference fit, an oil duct a9 is arranged in the crankshaft right half shaft 7, the crankpin 4 is internally provided with an oil duct b10, the oil duct a9 is communicated with an oil duct b10 through an oil duct c11 arranged in the crankshaft right half shaft 7 and the crankpin 4, the left end and the right end of the oil duct b10 are respectively blocked through the crankpin plugs 3 at two sides, a plurality of radial type d12 which are communicated with the crankpin bearing 6 are evenly distributed into two groups and symmetrically arranged at two sides of the oil duct b10 in the crankpin 4.

In another embodiment of the present utility model, the number of the oil channels d12 is 4-8, and the number of each group is 2-4. More preferably, the number of the oil passages d12 is 8, and the number of each group is 4. The arrangement of the same group of 4 oil channels d can enable more engine oil to enter the needle bearing 6, thereby better playing a role in lubrication.

In another embodiment of the present utility model, the centers of the oil passages d12 on the outer surface of the crankpin 4 in the same group are on the same straight line, and the included angle between the straight line and the axis of the crankpin 4 is 15 °. The oil channels d12 in the same group are obliquely arranged relative to the axial lead of the crankpin 4 and are radial oil channels, so that engine oil passing through the oil channels d can be contacted with the needle rollers on the needle roller bearings 6 at the same time, the lubrication speed is increased, and the lubrication effect is improved.

In another embodiment of the present utility model, the diameter of the oil passages d12 located in the same group on the outer surface of the crankpin 4 increases from both sides inward in order. The oil passage d positioned in the middle plays a main lubrication role, and the oil passages d positioned on two sides play an auxiliary role.

In the actual use process, engine oil enters from an oil passage a9 of the right half shaft 7 of the crankshaft, and then sequentially enters the needle bearing 6 through an oil passage c11, an oil passage b10 and an oil passage d12, so that the needle bearing 6 is lubricated. The plurality of radial-radiation-type oil channels d enable engine oil passing through the plurality of oil channels d to be in contact with the needle rollers on the plurality of needle roller bearings 6 at the same time, so that the lubrication speed is increased, the lubrication effect is improved, and the service life of the crankshaft is prolonged by more than 30%.

While the embodiments of the present utility model have been described in detail, those skilled in the art should not understand that the present utility model is limited to the specific embodiments and applications.

Claims

1. The utility model provides a single cylinder motorcycle engine crankshaft lubricating system, includes left semi-axis (1) of bent axle, left bearing (2), 2 crankpin plugs (3), crankpin (4), connecting rod (5), bearing (6), right semi-axis (7) of bent axle, right bearing (8), crankpin (4) set up in right semi-axis (7) of bent axle, and bearing (6) cover is established in crankpin (4) outside, and connecting rod (5) cover is established in bearing (6) outside, and left bearing (2), right bearing (8) pass through interference fit and left semi-axis (1) of bent axle, right semi-axis (7) pressure equipment of bent axle, be provided with oil duct a (9) in right semi-axis (7) of bent axle, be provided with oil duct b (10) in crankpin (4), oil duct a (9) and oil duct b (10) are through setting up in right semi-axis (7) of bent axle, crankpin (4) c (11) intercommunication of both sides, and the left and right ends of oil duct b (10) are respectively through crankpin plug (3) of both sides, its characterized in that: the crank pin (4) is internally provided with a plurality of radial oil channels d (12) which are communicated with the oil channel b (10) and the needle bearing (6), and the plurality of oil channels d (12) are equally divided into two groups and symmetrically arranged at two sides of the oil channel b (10).

2. A single cylinder motorcycle engine crankshaft lubrication system as claimed in claim 1, wherein: the number of the oil channels d (12) is 4-8, and the number of each group is 2-4.

3. A single cylinder motorcycle engine crankshaft lubrication system as claimed in claim 2, wherein: the number of the oil channels d (12) is 8, and the number of each group is 4.

4. A single cylinder motorcycle engine crankshaft lubrication system as claimed in claim 1, wherein: the centers of the oil channels d (12) positioned in the same group on the outer surface of the crank pin (4) are positioned on the same straight line, and the included angle between the straight line and the axis of the crank pin (4) is 15 degrees.

5. A single cylinder motorcycle engine crankshaft lubrication system as claimed in claim 1, wherein: the diameters of the oil channels d (12) positioned in the same group on the outer surface of the crank pin (4) are sequentially increased from two sides inwards.