CN110017190A - A kind of method and device of the secondary variable lubricating oil pump of combination valve control - Google Patents

Abstract

The invention discloses a method and a device for a two-stage variable oil pump controlled by a combined valve, which is mainly composed of a variable vane pump, a filter, an engine, a safety valve, a combined valve and the like; the variable vane pump includes a pump inlet cavity and a pump outlet cavity. , pump adjustment oil chamber; solenoid valve is provided with three oil ports; combination valve includes low pressure valve core, high pressure valve core, spring, low pressure control chamber, high pressure control chamber, inner cavity; low pressure valve core oil discharge groove, high pressure valve core oil discharge groove , the oil discharge hole of the closed volume cavity formed by the high and low pressure valves; the three oil ports of the solenoid valve are respectively connected with the engine oil pan, the pump outlet oil passage and the low pressure control chamber; through the dual control of the solenoid valve and the combined valve, the variable The secondary variable displacement of the pump is faster than the traditional double-regulating cavity variable pump, and the variable control is stable. The pressure curve output by the variable pump is more suitable for the needs of the engine. It adopts the structure of low pressure valve core and high pressure valve core. There is a certain gap between the low pressure valve core and the high pressure valve core, which can ensure that the output curve of the variable pump controlled by high pressure is more stable.

Description

A method and device for a two-stage variable oil pump controlled by a combined valve

technical field

The invention discloses a two-stage variable oil pump method controlled by a combined valve, and also provides a device for realizing the method, and relates to the technical field of internal combustion engine lubrication systems.

Background technique

The application of variable vane pumps is becoming more and more extensive, and the requirements for variable displacement pump technology are also getting higher and higher. Most of the commonly used engines now use quantitative oil pumps. The displacement per revolution of the quantitative oil pump is fixed, so the displacement of the quantitative oil pump changes linearly with the speed of the engine. In this way, there is a difference between the displacement of the oil pump and the demand of the engine. The oil pump will do a lot of useless work and waste energy. Therefore, the mechanical variable pump still cannot fully meet the oil pressure demand curve of the engine. The response speed of the variable pump is slow, and the variable control unstable.

SUMMARY OF THE INVENTION

The invention provides a method and device for a two-stage variable oil pump controlled by a combined valve, which can realize the high and low pressure two-stage variable control of a variable displacement pump, so that the displacement of the oil pump can meet the oil pressure requirements of the engine at different speeds .

The invention discloses a two-stage variable oil pump assembly controlled by a combination valve, which includes a variable vane pump, a filter, a pump oil return channel, an engine oil pan, an engine, a pump oil channel, a pump outlet channel, and a pump adjustment channel. Oil passage, safety valve, combination valve, lubricating oil passage;

The variable vane pump includes a pump inlet cavity, a pump outlet cavity, and a pump adjustment oil cavity;

The solenoid valve is provided with three oil ports: T port, P port and A port;

The combination valve includes a low-pressure valve core, a high-pressure valve core, a spring, a low-pressure control chamber, a high-pressure control chamber, and an inner chamber; port, oil port d, oil port g, oil port h, low pressure valve core oil discharge groove, high pressure valve core oil discharge groove, closed volume cavity oil discharge hole formed by high and low pressure valve;

Wherein, the oil port a and the oil port b are connected to the oil outlet of the pump;

The oil passage e port and the oil passage f port are connected with the pump adjusting oil passage;

The oil port c is connected to the lubricating oil channel;

The oil port g port and the oil port h port are connected with the oil return passage of the pump;

The T port of the solenoid valve is connected with the engine oil pan;

The P port of the solenoid valve is connected with the oil outlet of the pump;

The A port of the solenoid valve is connected to the low pressure control chamber through the oil passage d port;

During operation, when the engine lubricating oil supply channel has not reached the low pressure opening state, the lubricating oil of the oil pan enters the oil inlet chamber of the variable vane pump part through the oil inlet channel, and continues to obtain energy through the vane pump part and enters the oil discharge chamber of the pump. The pressure oil is discharged into the lubricating oil passage of the engine through the pump oil discharge passage and the filter, and returns to the oil pan. With the eccentricity of the rotor, the displacement and pressure of the pressure oil can be changed, and the low pressure can be adjusted;

Low-pressure working state: The P port of the solenoid valve is connected to the A port, the pressure oil passes through the pump outlet, the solenoid valve enters the low-pressure oil circuit control chamber of the combination valve, pushes the low-pressure spool to move to the right, compresses the spring, and makes the combination spool The inner cavity pressure oil formed between them is discharged back to the engine oil pan through the pump return passage, so that the pressure oil is discharged into the pump adjustment oil cavity through the combination valve and the adjustment oil passage, and the eccentricity between the adjustment ring and the rotor is reduced, thereby changing the pressure. Oil displacement and pressure, low pressure adjustment; high pressure working state: the P port of the solenoid valve is not connected with the A port, the A port is connected with the T port, and a part of the pressure oil is discharged into the engine through the pump outlet, the filter, and the solenoid valve. The lubricating oil channel is returned to the oil pan, and a part of the pressure oil enters the high-pressure oil circuit control chamber of the combination valve through the pump oil channel and the filter, pushes the high-pressure valve core to move to the left, compresses the spring, and makes the gap formed between the combined valve cores. The pressure oil in the inner cavity is discharged back to the engine oil pan through the pump return passage, so that the pressure oil is discharged into the pump adjusting oil chamber through the combination valve and the adjusting oil passage, and the eccentricity between the adjusting ring and the rotor is changed, thereby changing the displacement and pressure of the pressure oil. , for high pressure regulation.

During high-pressure adjustment, there is a gap between the low-pressure spool and the high-pressure spool. By adjusting the gap between the low-pressure spool and the high-pressure spool, and adjusting the amount of oil entering the adjustment cavity, the pressure oil of the oil pump can be adjusted. Displacement, so that the output working pressure and flow of the pump meet the needs of the engine.

When the lubricating oil in the oil discharge passage reaches the opening pressure of the safety valve, a part of the pressure oil is discharged back to the engine oil pan through the pump oil discharge passage and the safety valve.

The positive effects of the present invention are:

On the basis of the structure of the single-adjustment cavity variable pump, there are dual control of the solenoid valve and the combined valve to realize the two-stage variable displacement of the variable pump. Compared with the traditional double-adjustment cavity variable pump, the response speed is faster, the variable control is stable, and the variable pump The output pressure curve is more suitable for the needs of the engine. It adopts the structure of low pressure valve core and high pressure valve core. At the same time, there is a certain gap between the low pressure valve core and the high pressure valve core, which can ensure that the output curve of the variable pump controlled by high pressure is more stable.

Description of drawings

Figure 1 is a schematic diagram of the structure of the inventive device (not reaching the open state);

Fig. 2 is the structural representation of the low pressure state of the inventive device;

Figure 3 is a schematic structural diagram of the inventive device in a high-voltage state.

Detailed ways

The present invention is further described by the following examples, and does not limit the present invention in any way. On the premise of not departing from the technical solutions of the present invention, any changes or changes that are easily realized by those of ordinary skill in the art made by the present invention will be fall within the scope of the claims of the present invention.

Example 1

As shown in FIGS. 1 to 3 , a two-stage variable oil pump device controlled by a combination valve according to the present invention mainly consists of a variable vane pump 1, a filter 2, a pump return passage 4, an engine oil pan 5, Engine 6, pump inlet passage 11, pump outlet passage 12, pump regulating oil passage 13, safety valve 14, combination valve 15, and lubricating oil passage 16; the variable vane pump 1 includes a pump oil inlet chamber 11a, a pump Oil outlet chamber 12a, pump regulating oil chamber 13a;

The solenoid valve 3 is provided with three oil ports: T port, P port and A port;

The combined valve 15 includes a low pressure valve core 151, a high pressure valve core 152, a spring 155, a low pressure control chamber 156, a high pressure control chamber 157, and an inner chamber 153; 15b, oil port f 15f, oil port c 15c, oil port d port 15d, oil port g port 15g, oil port h port 15h, low pressure valve core oil discharge groove 151a, high pressure valve core oil discharge groove 152a, high and low pressure valve formation The oil discharge hole 152b of the closed volume cavity;

Wherein, the oil passage a port 15a and the oil passage b port 15b are connected to the pump oil outlet 4;

The oil passage e port 15e and the oil passage f port 15f are connected with the pump regulating oil passage 13;

The oil passage c port 15c is connected with the lubricating oil passage 16;

The oil g port 15g and the oil h port 15h are connected to the pump oil return passage 4;

The T port of the solenoid valve 3 is connected to the engine oil pan 5;

The P port of the solenoid valve 3 is connected to the pump outlet oil passage 12;

The A port of the solenoid valve 3 is connected to the low pressure control chamber 156 through the oil passage d port 15d;

When the device of the present invention works, when the lubricating oil passage 16 of the engine 6 does not reach the low-pressure open state, the lubricating oil of the oil pan 5 enters the oil inlet chamber 11 a of the variable vane pump 1 through the pump oil inlet passage 11, and continues through the vane pump 1. Obtained energy enters the oil discharge chamber 12a of the pump; part of the pressure oil is discharged into the lubricating oil passage 16 of the engine 6 through the pump oil discharge passage 12 and the filter 2, and returns to the engine oil pan 5; part of the pressure oil passes through the pump to adjust the oil passage 13 , Combination valve 15e port, low pressure valve core oil discharge groove 151a, high pressure valve core oil discharge groove 152a, closed volume cavity oil discharge hole 152b formed by high and low pressure valve, oil port g port 15g, oil port e port 15e, low pressure valve core oil discharge groove 151a, the gap 154, and the oil passage g port 15g are discharged back to the engine oil pan 5 through the pump oil return passage 4.

As shown in Fig. 2, under the low pressure working state, the P port of the solenoid valve is connected to the A port, and the pressure oil enters the low pressure control chamber 156 through the pump oil discharge passage 12, the solenoid valve 3, and the oil passage d port 15d of the combination valve 15, and pushes the low pressure The valve core 151 moves to the right and compresses the spring 155, so that the pressure oil in the inner cavity 153 formed between the combined valve cores 151 and 152 passes through the closed volume cavity formed by the high and low pressure valve. Channel 4 is discharged back to the engine oil pan, so that the oil port a 15a and the oil port e 15e of the combination valve 15 are connected, and the pressure oil in the pump oil discharge channel 12 is discharged into the pump regulating oil chamber 13a through the regulating oil channel 13, changing the Adjust the eccentricity of the ring and the rotor, thereby changing the displacement and pressure of the pressure oil to achieve the purpose of low pressure regulation. In this working state, although there is always pressure oil discharged from the pump in the high pressure control chamber 157 of the combination valve 15, the calculation ensures that the pressure oil action area of the low pressure spool 151 is larger than the pressure oil action area of the high pressure spool 152. According to the principle of force balance, the right end face of the high pressure valve core 152 is in contact with the end face of the valve seat of the pump body and will not move to the left.

As shown in Figure 3, in the high-pressure working state, the P port of the solenoid valve is not connected to the A port, and the A port and the T port are connected. The lubricating oil channel is returned to the oil pan, and another part of the pressure oil enters the high pressure control chamber 157 of the combination valve 15 through the pump oil channel 12, the filter 2, and the oil port 15c of the combination valve 15, and pushes the high pressure valve core 152 to the Move to the left, compress the spring 155, so that the inner cavity pressure oil formed between the combined valve cores 151 and 152 passes through the closed volume cavity oil discharge hole 152b formed by the high and low pressure valve, the oil port g port 15g, and the pump return oil passage 4 discharges Return to the engine oil pan, make the oil passage b port 15b of the combination valve communicate with the oil passage f port 15f, the pressure oil enters the pump adjustment chamber 13a through the control oil passage 13, and changes the eccentricity between the adjustment ring and the rotor, thereby changing the pressure oil discharge volume and pressure to achieve the purpose of high pressure regulation.

During high pressure adjustment, a gap 154 of (0.05-1 mm) is set between the low pressure valve core 151 and the high pressure valve core 152, and the gap is different according to the conditions of different pumps. By adjusting the size of the gap 154 of the flow passages of the low pressure valve core 151 and the high pressure valve core 152, and adjusting the amount of oil entering the adjustment chamber, the displacement of the oil pump pressure oil can be adjusted, so that the output working pressure and flow of the pump are in line with the engine. need.

When the lubricating oil in the oil discharge passage reaches the opening pressure of the safety valve, a part of the pressure oil is discharged back to the engine oil pan through the pump oil discharge passage 12 and the safety valve 14 .

Claims (2)

1. a kind of method of the secondary variable lubricating oil pump of combination valve control, it is characterised in that: including variable vane pump, filter, Blowback oil duct, engine, pumps oil input channel, pumps out oil duct, pump adjusting oil duct, safety valve, combination valve, lubrication engine sump tank Oil duct；

The variable vane pump includes pump oil suction chamber, pumps out oil pocket, pump adjusting oil pocket；

The solenoid valve is equipped with T mouthfuls, three P mouthfuls, A mouth logical hydraulic fluid ports；

The combination valve includes low pressure spool, high pressure spool, spring, low voltage control chamber, high voltage control chamber, inner cavity；Logical oil a Mouth, logical b mouthfuls of oil, logical f mouthfuls of oil, logical c mouthfuls of oil, leads to d mouthfuls of oil, logical g mouthfuls of oil, logical h mouthfuls of oil, low pressure spool oil unloading trough, height at logical e mouthfuls of oil The sealed volume chamber outage that pressure valve core oil unloading trough, height pressure valve are formed；

Wherein, lead to a mouthfuls of oil, logical b mouthfuls of oil is connected with the oil duct that pumps out；

Logical e mouthful of oil, f mouthfuls of logical oil be connected with adjusting oil duct is pumped；

Logical c mouthfuls of oil is connected with oil leab；

Logical g mouthfuls of oil, logical h mouthfuls of oil are connected with blowback oil duct；

The T mouth of solenoid valve is connected with the engine sump tank；

The P mouth of solenoid valve is connected with the oil duct that pumps out；

The A mouth of solenoid valve is connected by logical d mouthfuls of the oil with low voltage control chamber；

When work, it is not up to low-pressure opening state for oil duct in engine lubrication, the lubricating oil of oil sump is entered by oil input channel The oil suction chamber of variable vane pump part continues the oil-discharging cavity that acquisition energy enters pump, a part of pressure oil by blade pump portion The oil leab of engine, and oil return bottom case are discharged by pump oil expulsion channel and filter, a part of pressure oil adjusts oil by pump Road, combination valve flow back to engine sump tank through blowback oil duct, increase the eccentricity of adjustment ring and rotor, to change pressure oil row Amount and pressure carry out low pressure adjusting；

Operating on low voltage state: the P mouth of solenoid valve is communicated with A mouthfuls, and pressure oil process pumps out oil duct, solenoid valve enters the low of combination valve Pressure oil road control chamber pushes low pressure spool to move to the right, and compressed spring passes through the chamber pressure oil formed between combination valve core Blowback oil duct flows back to engine sump tank, so that the combined valve of pressure oil and adjusting oil duct is discharged into pump and adjusts oil pocket, reduces adjustment ring Low pressure adjusting is carried out to change pressure oil discharge capacity and pressure with the eccentricity of rotor；High-pressure work state: the P mouth of solenoid valve It is not communicated with A mouthfuls, A mouthfuls communicate with T mouthfuls, and a part of pressure oil is by pumping out the profit that oil duct, filter, solenoid valve are discharged into engine Grease way and oil return bottom case, a part of pressure oil is by pumping out oil duct, filter enters the high-pressure oil passage control chamber of combination valve, pushes away Dynamic high pressure spool moves to the left, compressed spring, and the chamber pressure oil formed between combination valve core is made to flow back to hair through blowback oil duct Motivation oil sump makes the combined valve of pressure oil and adjusting oil duct be discharged into pump and adjusts oil pocket, changes the eccentricity of adjustment ring and rotor, To change pressure oil discharge capacity and pressure, high voltage adjusting is carried out；

In high voltage adjusting, the cooperation of low pressure spool and high pressure spool is equipped with gap, can be by adjusting low pressure spool, high pressure spool The gap size of cooperation, the oil mass being adjusted into adjusting cavity make the output of pump to reach the discharge capacity for adjusting lubricating oil pump pressure oil Operating pressure and flow meet the needs of engine；

When the lubricating oil of oil expulsion channel reaches opening pressure of safety valve, a part of pressure oil is flow back to by pump oil expulsion channel and safety valve Engine sump tank.

2. a kind of secondary variable oil pump device of combination valve control, it is characterised in that:

Mainly by variable vane pump, filter, blowback oil duct, engine sump tank, engine, pump oil input channel, pump out oil duct, pump Oil duct, safety valve, combination valve, oil leab is adjusted to constitute；

The variable vane pump includes pump oil suction chamber, pumps out oil pocket, pump adjusting oil pocket；

The solenoid valve is equipped with T mouthfuls, three P mouthfuls, A mouth logical hydraulic fluid ports；

The combination valve includes low pressure spool, high pressure spool, spring, low voltage control chamber, high voltage control chamber, inner cavity；Logical oil a Mouth, logical b mouthfuls of oil, logical f mouthfuls of oil, logical c mouthfuls of oil, leads to d mouthfuls of oil, logical g mouthfuls of oil, logical h mouthfuls of oil, low pressure spool oil unloading trough, height at logical e mouthfuls of oil The sealed volume chamber outage that pressure valve core oil unloading trough, height pressure valve are formed；

Wherein, lead to a mouthfuls of oil, logical b mouthfuls of oil is connected with the oil duct that pumps out；

Logical e mouthful of oil, f mouthfuls of logical oil be connected with adjusting oil duct is pumped；

Logical c mouthfuls of oil is connected with oil leab；

Logical g mouthfuls of oil, logical h mouthfuls of oil are connected with blowback oil duct；

The T mouth of solenoid valve is connected with the engine sump tank；

The P mouth of solenoid valve is connected with the oil duct that pumps out；

The A mouth of solenoid valve is connected by logical d mouthfuls of the oil with low voltage control chamber；

The cooperation of the low pressure spool and the high pressure spool is equipped with the gap of 0.05 ~ 1mm.