CN101907005B - Engine lubricant passage - Google Patents

Abstract

An engine lubricating oil circuit, the oil inlet of the first chamber of the oil pump communicates with the oil outlet of the primary oil filter, and the oil outlet of the first chamber of the oil pump communicates with the oil inlet of an external oil tank; The first oil outlet of the fuel tank communicates with the oil inlet of the second chamber of the oil pump, the second oil outlet of the external oil tank communicates with the external oil inlet of the cylinder head; the oil outlet of the second chamber of the oil pump communicates with the The oil inlet hole of the oil filter is connected, and the oil passage of the crankcase cover connected with the oil outlet of the oil filter is divided into two routes, one is connected with the oil inlet passage of the crankshaft needle, and the other is connected with the inlet of the three-way outer oil pipe. The oil ports are connected, the first oil outlet of the three-way outer oil pipe communicates with the oil holes of the main and auxiliary shafts, and the second oil outlet of the three-way outer oil pipe communicates with the camshaft oil passage. The invention not only achieves the purpose of lubricating the engine, but also significantly reduces the cylinder temperature and oil temperature of the engine, improves the operating conditions of the engine, and increases the power of the engine.

Description

engine lubricating oil circuit

technical field

The invention belongs to the technical field of engine lubrication, and in particular relates to an engine lubricating oil cooling system on a motorcycle.

Background technique

General-purpose motorcycle engines store the lubricating oil for the lubrication and cooling system in the engine crankcase, and the oil pump in the crankcase sends the lubricating oil through the oil passages inside the engine to the crankshaft needle roller → cylinder hole, piston ; cam and rocker arm or rocker arm and push rod of the cylinder head → lower rocker arm and cam; rotating parts of the main and auxiliary shafts; bearings; purpose of the engine. The use of internal oil passage lubrication requires the engine crankcase to have sufficient volume to accommodate the lubricating oil capacity specified by engines of different displacements, which will result in a larger engine volume, which is not suitable for off-road motorcycles for engine volume requirements. At the same time, there are many materials required to make the engine crankcase, and the cost will increase, and the cooling effect of the lubricating oil is not obvious. The cylinder temperature and oil temperature of the engine are high, which is not conducive to the normal operation of the engine and will reduce the power of the engine. It is not suitable for Large displacement air-cooled engine.

Contents of the invention

The technical problem to be solved by the present invention is to provide an engine lubricating oil circuit that can effectively reduce the volume of the crankcase to reduce the cylinder temperature and oil temperature of the engine, improve the operating conditions of the engine, and increase the power of the engine.

The technical scheme of the present invention is as follows: a kind of engine lubricating oil circuit, the crankcase cover is installed on the side of the crankcase, and the inside of the crankcase is equipped with an oil filter, crankshaft needle roller, main shaft, auxiliary shaft, oil pump and primary oil filter, the top of the crankcase is provided with a cylinder block, on which the cylinder head is installed, the key lies in:

A. An external oil tank and an external oil pipe are arranged outside the crankcase;

B. The oil pump is equipped with two sets of inner and outer rotors of different sizes, wherein the large inner and outer rotors are located in the first chamber of the oil pump, and the small inner and outer rotors are located in the second chamber of the oil pump. The first chamber of the oil pump The oil inlet of the engine is connected with the oil outlet of the primary engine oil filter in the crankcase, the oil outlet of the first chamber of the oil pump is directly connected with the oil outlet of the crankcase cover, and the oil outlet of the external oil tank is connected through the first outer oil pipe. The oil inlet is connected;

C. The first oil outlet of the external oil tank is connected to the oil inlet of the crankcase cover through the second outer oil pipe, and the oil inlet of the crankcase cover communicates with the oil inlet of the second chamber of the oil pump. The second oil outlet of the oil tank is connected with the external oil inlet of the cylinder head through the third outer oil pipe;

D. The oil outlet of the second chamber of the oil pump communicates with the oil inlet hole of the oil filter, and the oil channel of the crankcase cover connected with the oil outlet of the oil filter is divided into two channels, and one channel is connected with the inlet of the crankshaft needle roller. The oil passages are connected, and the other road is connected with the oil inlet of the three-way outer oil pipe. The first oil outlet of the three-way outer oil pipe is connected with the oil inlet of the crankcase and communicated with the oil holes of the main and auxiliary shafts. The second oil outlet of the outer oil pipe is connected with the oil inlet of the cylinder block, and communicates with the camshaft oil passage on the cylinder head through the cylinder block oil passage and the cylinder head oil passage.

On the basis of the traditional structure, the present invention simplifies the oil passage in the engine, sets an external oil tank and a special external oil pipe outside the engine, and is equipped with a special double inner and outer rotor oil pump in the engine. The lubricating oil filtered once is pumped into the external oil tank through the first chamber of the oil pump and the first outer oil pipe, and becomes cooled lubricating oil after natural or forced air cooling; The lubricating oil after cooling is pumped back to the second chamber of the oil pump and the chamber of the oil filter in the crankcase through the second outer oil pipe. , enter the crankshaft needle roller, lubricate the crankshaft needle roller, cylinder bore, piston and piston ring; on the other hand, pump to the three-way outer oil pipe, the first oil outlet of the three-way outer oil pipe is connected to the crankcase oil inlet, and enters the main and auxiliary The shaft oil inlet hole lubricates the rotating parts of the main and auxiliary shafts; the second oil outlet of the three-way outer oil pipe is connected with the cylinder block oil inlet, and enters the camshaft oil passage through the cylinder block oil passage and the cylinder head oil passage to lubricate the cam and Rocker arm, rocker arm and push rod or lower rocker arm and cam friction pair to achieve the purpose of lubricating the engine; the remaining lubricating oil cooled in the external oil tank enters the cylinder through the second oil outlet of the external oil tank through the third outer oil pipe The external oil inlet on the top of the head flows into the rocker chamber of the cylinder head, and takes away the high-temperature oil in the cylinder head to achieve the purpose of cooling the cylinder head and lowering the cylinder temperature.

The invention stores most of the lubricating oil in the external oil tank, reduces the volume of the crankcase of the engine, makes the engine structure more compact, and is more suitable for off-road motorcycles. At the same time, the crankcase has fewer consumables, easier processing, and a simpler process, which can effectively reduce production costs. The lubricating oil is cooled outside the engine and then pumped back to the engine, which can significantly reduce the cylinder temperature and oil temperature of the engine. Compared with the traditional structure, the oil temperature can be reduced by about 30°C.

An oil dipstick installation hole is opened on the top of the external oil tank, so that the oil dipstick can be installed, and the oil level in the external oil tank can be detected by the oil dipstick; a third oil outlet is opened at the bottom of the external oil tank. The oil outlet is blocked by a sealing screw plug, and the sealing screw plug is threadedly matched with the external oil tank. The sealing screw plug is installed securely and is easy to operate. Usually, the third oil outlet is sealed with the sealing screw plug, and the oil impurities in the external oil tank can be cleaned through the third oil outlet when the sealing screw plug is removed.

The external oil tank is integrated on the head tube at the front end of the vehicle frame. The lower end of the head tube is made into a box-type structure through plates to form an external fuel tank. On the one hand, it is easy to implement, and there are few places to change on the frame, and the transformation cost is low; on the other hand, the external fuel tank is located at the front end of the frame. , the windward cooling effect is remarkable.

The external oil tank is arranged in the oil cooler, and can also be arranged in other positions at the front end of the motorcycle, which can also achieve a good cooling effect.

The external oil tank is provided with two chambers communicating with each other, the inner and the outer, wherein the oil inlet of the inner chamber of the external oil tank is communicated with the oil outlet of the first chamber of the oil pump through the first outer oil pipe. The first oil outlet of the outer chamber of the fuel tank communicates with the oil inlet of the second chamber of the oil pump through the second outer oil pipe, and the second oil outlet of the outer chamber of the external oil tank communicates with the external connection of the cylinder head through the third outer oil pipe. The oil inlets are connected. The hot oil pumped out of the first chamber of the oil pump first enters the inner chamber of the external oil tank, and the lubricating oil after cooling enters the outer chamber, part of which is pumped back into the second chamber of the oil pump by the small inner and outer rotors of the oil pump, and the other part It flows to the cylinder head, which can effectively prevent hot oil from flowing back to the engine without cooling, and has good lubricating and cooling effects.

Beneficial effects: the invention not only achieves the purpose of lubricating the engine, but also reduces the volume of the engine crankcase, makes the structure of the engine more compact, and is more suitable for off-road motorcycles; the invention can obviously reduce the cylinder temperature and oil temperature of the engine, The operating conditions of the engine are improved and the power of the engine is increased.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

As shown in Figure 1, engine lubricating oil is routed through crankcase 1, oil filter 2, crankshaft needle roller 3, cylinder block 4, cylinder head 5, main shaft 6, countershaft 7, external oil tank 8, oil pump 9, primary The oil filter 10, the first outer oil pipe 11, the second outer oil pipe 12, the third outer oil pipe 13 and the three-way outer oil pipe 14 are composed of crankcase covers on both sides of the crankcase 1. The bottom of the primary oil filter 10 is installed, and the inside of the crankcase 1 is also equipped with an oil filter 2, crankshaft needle roller 3, main shaft 6, countershaft 7 and oil pump 9. A cylinder block 4 is arranged on the top of the crankcase 1 , and a cylinder head 5 is installed on the cylinder block 4 . The transmission structure and working principle in the engine are the same as those of the prior art, and will not be repeated here.

As can be seen from FIG. 1 , an external oil tank 8 and an external oil pipe are arranged outside the crankcase 1 . The external oil tank 8 has two internal and external chambers 8a, 8b that communicate with each other. The external oil tank 8 can be integrated on the head pipe at the front end of the frame; or set in the oil cooler; or set in the motorcycle Elsewhere on the front end. Two sets of inner and outer rotors of different sizes are housed in the described oil pump 9, and the oil pumping capacity of the large inner and outer rotors is larger than that of the small inner and outer rotors, preferably twice. The large inner and outer rotors are located in the first chamber of the oil pump 9, and the small inner and outer rotors are located in the second chamber of the oil pump 9. The oil inlet of the first chamber of the oil pump is connected to the primary oil filter 10 of the engine in the crankcase 1. The oil outlet of the first chamber of the oil pump is directly connected with the oil outlet of the crankcase cover. The oil inlets of the inner chambers of the oil tank are connected.

Also know from Fig. 1, the first oil outlet of the external oil tank outer chamber of external oil tank 8 bottoms is connected with the oil inlet of crankcase cover by second outer oil pipe 12, and the oil inlet of this crankcase cover is connected with the oil inlet of crankcase cover. The oil inlet of the second chamber of the oil pump communicates, and the second oil outlet of the external oil tank outer chamber on the top of the external oil tank 8 is connected with the external oil inlet of the cylinder head 5 top by the third outer oil pipe 13 . An oil dipstick mounting hole is opened on the top of the external oil tank 8 to facilitate the installation of the oil dipstick; the bottom of the external oil tank 8 is provided with a third oil outlet, which is blocked by a sealing screw plug. Said sealing screw plug cooperates with external oil tank 8 threads.

It can be further seen from Fig. 1 that the oil outlet of the second chamber of the oil pump communicates with the oil inlet hole of the oil filter 2, and the crankcase cover oil channel connected with the oil outlet of the oil filter 2 is divided into two paths, One way communicates with the oil inlet passage of the crankshaft needle roller 3, and the other way connects with the oil inlet of the three-way outer oil pipe 14, and the first oil outlet of the three-way outer oil pipe 14 is connected with the crankcase 1 oil inlet, and The oil passage communicates with the oil holes of the main and auxiliary shafts 6 and 7, and the second oil outlet of the three-way outer oil pipe 14 is connected with the oil inlet of the cylinder block 4, through the cylinder block oil passage 4a, the cylinder head oil passage 5a and the The camshaft oil passage 5b on the cylinder head 5 communicates.

The working principle of the present invention is as follows:

The large inner and outer rotors in the oil pump 9 pump out the lubricating oil filtered by the primary oil filter 10 in the engine crankcase 1, and pump it into the external oil tank 8 through the first chamber of the oil pump and the first outer oil pipe 11. After natural or forced After air cooling, it becomes lubricating oil after cooling.

The small inner and outer rotors in the oil pump pump 1/2 of the lubricating oil cooled in the external oil tank 8 back to the second chamber of the oil pump and the chamber of the oil filter in the crankcase through the second outer oil pipe 12 at 1 times the flow rate. , after secondary filtration by the oil filter 2, on the one hand, pump to the crankcase cover and crankshaft oil passage, enter the crankshaft needle roller 3, lubricate the crankshaft needle roller, cylinder bore, piston and piston ring; on the other hand, pump to the tee The outer oil pipe 14, the first oil outlet of the three-way outer oil pipe 14 is connected with the crankcase oil inlet, enters the oil inlet holes of the main and auxiliary shafts 6 and 7, and lubricates the rotating parts of the main and auxiliary shafts; the third oil outlet of the three-way outer oil pipe 14 The second oil outlet is connected to the oil inlet of the cylinder block 4, and enters the camshaft oil passage 5b through the cylinder block oil passage 4a, the cylinder head oil passage 5a, and lubricates the friction between the cam and the rocker arm, the rocker arm and the push rod or the lower rocker arm and the cam Vice, to achieve the purpose of lubricating the engine.

The remaining 1/2 lubricating oil cooled in the external oil tank 8 enters the oil inlet at the top of the cylinder head 5 through the second oil outlet on the top of the external oil tank 8 through the third outer oil pipe 13, and flows into the rocker chamber of the cylinder head. Take away the high-temperature oil in the cylinder head to achieve the purpose of cooling the cylinder head and lowering the cylinder temperature.

Claims (5)

1. An engine lubricating oil circuit, the crankcase cover is installed on the side of the crankcase (1), and the inside of the crankcase (1) is equipped with an oil filter (2), a crankshaft needle roller (3), a main shaft (6 ), the countershaft (7), the oil pump (9) and the primary oil filter (10), the top of the crankcase (1) is provided with a cylinder block (4), and the cylinder head (5) is installed on the cylinder block (4) ), characterized by: A, an external oil tank (8) and an external oil pipe are arranged outside the crankcase (1); B. The oil pump (9) is equipped with two sets of inner and outer rotors of different sizes, wherein the large inner and outer rotors are located in the first chamber of the oil pump (9), and the small inner and outer rotors are located in the second chamber of the oil pump (9) , the oil inlet of the first chamber of the oil pump communicates with the oil outlet of the engine primary oil filter (10) in the crankcase (1), and the oil outlet of the first chamber of the oil pump directly connects with the crankcase cover The oil outlet is connected and connected with the oil inlet of the external oil tank (8) through the first outer oil pipe (11); C. The first oil outlet of the external oil tank (8) is connected with the oil inlet of the crankcase cover through the second outer oil pipe (12), and the oil inlet of the crankcase cover is connected with the second chamber of the oil pump. The oil inlets are connected, and the second oil outlet of the external oil tank (8) is connected with the external oil inlet of the cylinder head (5) through the third outer oil pipe (13); D. The oil outlet of the second chamber of the oil pump communicates with the oil inlet of the oil filter (2), and the crankcase cover oil channel connected with the oil outlet of the oil filter (2) is divided into two channels, one channel It communicates with the oil inlet passage of the crankshaft needle roller (3), and the other connects with the oil inlet of the three-way outer oil pipe (14), and the first oil outlet of the three-way outer oil pipe (14) is connected with the crankcase (1 ) oil inlet, and communicate with the oil holes of the main and auxiliary shafts (6, 7), the second oil outlet of the three-way outer oil pipe (14) is connected with the oil inlet of the cylinder block (4), and passes through the cylinder block The oil passage (4a), the cylinder head oil passage (5a) communicate with the camshaft oil passage (5b) on the cylinder head (5). 2. The lubricating oil circuit of the engine according to claim 1, characterized in that: an oil dipstick mounting hole is opened on the top of the external oil tank (8), and a third oil outlet is opened at the bottom of the external oil tank (8). The third oil outlet is blocked by a sealing screw plug, which is threadedly matched with the external oil tank (8). 3. The engine lubricating oil circuit according to claim 1 or 2, characterized in that: the external oil tank (8) is integrated on the head pipe at the front end of the vehicle frame. 4. The engine lubricating oil circuit according to claim 1 or 2, characterized in that: the external oil tank (8) is arranged in the oil cooler. 5. The engine lubricating oil circuit according to claim 1 or 2, characterized in that: the external oil tank (8) is provided with two internal and external chambers (8a, 8b) communicating with each other, wherein the external The oil inlet of the inner chamber of the oil tank (8) communicates with the oil outlet of the first chamber of the oil pump through the first outer oil pipe (11), and the first oil outlet of the outer chamber of the external oil tank (8) passes through the second The outer oil pipe (12) communicates with the oil inlet of the second chamber of the oil pump, and the second oil outlet of the outer chamber of the external oil tank (8) is connected to the external inlet of the cylinder head (5) through the third outer oil pipe (13). The oil ports are connected.

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