An anti-stall electromagnetic actuator

Abstract

The present invention provides an anti-stall electromagnetic actuator. An internal moving space (12) of the moving iron core is formed between a fixed iron core (6) and a moving iron core (8). A one-way blocking element (3) is arranged outside the fixed iron core (6). An air-venting and oil-draining hole (61) is formed on the fixed iron core (6). The one-way blocking element (3) prevents the oil outside the fixed iron core (6) from flowing through the air-venting and oil-draining hole (61) into the internal moving space (12) of the moving iron core. The oil in the internal moving space (12) of the moving iron core acts on the one-way blocking element (3) through the air-venting and oil-draining hole (61) and enters outside the fixed iron core (6) through a discharge channel (13) between the one-way blocking element (3) and a valve housing (7). The present invention can block the oil and impurities outside the fixed iron core outside the internal moving space of the moving iron core of the electromagnetic actuator, and can effectively solve the problems of movement blockage such as jamming or seizure of the moving iron core caused by the intrusion of external impurities.

Description

Technical Field

[0001] The present invention relates to the field of electromagnetic actuator structure design, and more particularly to an anti-sticking electromagnetic actuator for controlling a camshaft phase adjustment control valve. Background Art

[0002] The variable valve timing adjustment technology refers to changing the overlap angle of the intake and exhaust valves by controlling the opening angle timing of the intake and exhaust valves of an internal combustion engine under specific engine operating conditions, so as to increase the intake charge and efficiency, better organize the intake swirl, adjust the cylinder explosion pressure and the residual exhaust gas volume, and finally obtain an improvement in the comprehensive performance of the engine such as power, torque, emissions, and fuel economy.

[0003] Currently, the mid-position variable valve timing adjustment technology has been widely applied. As the control unit of the camshaft phase adjuster, the electromagnetic actuator plays an extremely important role. However, during the operation of the existing electromagnetic actuator, the oil received from the oil discharge port of the oil control valve enters the internal movement space of the moving iron core on the electromagnetic actuator. During the movement of the moving iron core, the moving iron core is prone to being blocked or stuck, resulting in abnormal phase adjustment of the camshaft phase adjuster, seriously affecting the performance and emissions of the engine and the driving experience. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: in view of the problems existing in the prior art, to provide an anti-sticking electromagnetic actuator to improve the working reliability of the electromagnetic actuator.

[0005] The technical problem to be solved by the present invention is achieved by the following technical solutions: an anti-sticking electromagnetic actuator includes a one-way blocking element, a fixed iron core, a valve housing, a moving iron core, and an outer housing. The valve housing is fixedly connected to the outer housing. A moving iron core internal movement space is formed between the fixed iron core and the moving iron core. The one-way blocking element is arranged outside the fixed iron core. The fixed iron core is formed with an air-eliminating and oil-draining hole, and the one-way blocking element prevents the oil outside the fixed iron core from flowing through the air-eliminating and oil-draining hole into the moving iron core internal movement space, while the oil in the moving iron core internal movement space acts on the one-way blocking element through the air-eliminating and oil-draining hole and enters the outside of the fixed iron core through the discharge channel between the one-way blocking element and the valve housing.

[0006] Preferably, an axial hole is formed on the one-way blocking element. The moving iron core is fixedly connected to a push rod. The push rod penetrates through the axial hole and forms a relative sliding fit structure with the one-way blocking element.

[0007] Preferably, a limiting step is formed on the push rod, and the limiting step limits the axial stroke of the one-way blocking element.

[0008] Preferably, one end of the one-way partition element is connected to the fixed iron core, and the other end is a free end covering the air-eliminating and oil-draining hole. A discharge channel is formed between the free end of the one-way partition element and the valve housing.

[0009] Preferably, a buckle is formed at one end of the one-way partition element, and the buckle is connected to the fixed iron core.

[0010] Preferably, a relief groove is provided on the buckle, and a clamping groove matching the buckle is provided on the fixed iron core. An elastic clamping structure is formed between the buckle and the corresponding clamping groove on the fixed iron core.

[0011] Preferably, the moving iron core is movably installed in the inner cavity of the axial guide sleeve. The axial guide sleeve is fixedly installed between the valve housing and the outer housing, and a clearance fit structure is formed between the moving iron core and the axial guide sleeve.

[0012] Preferably, a guide groove is provided on the moving iron core, and a guide ball is arranged in the guide groove. The guide ball forms a rolling friction structure with the moving iron core and the axial guide sleeve respectively.

[0013] Preferably, a plurality of guide grooves are provided on the moving iron core, and the plurality of guide grooves are evenly distributed around the moving iron core.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: By providing a one-way partition element and using the one-way partition element to prevent the oil outside the fixed iron core from flowing through the air-eliminating and oil-draining hole into the internal movement space of the moving iron core, and the oil in the internal movement space of the moving iron core acts on the one-way partition element through the air-eliminating and oil-draining hole and enters the outside of the fixed iron core from the discharge channel between the one-way partition element and the valve housing. Thus, the oil outside the fixed iron core and the impurities in the oil can be blocked outside the internal movement space of the moving iron core of the electromagnetic actuator, avoiding the entry of impurities in the oil into the internal movement space of the moving iron core, effectively solving the problems of movement blockage such as jamming or seizure of the moving iron core caused by external impurity intrusion, improving the working reliability and service life of the electromagnetic actuator, reducing its maintenance cost, and at the same time, well avoiding the abnormal cam phase adjustment problem caused by the jamming or seizure of the electromagnetic actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural cross-sectional view of an anti-jamming electromagnetic actuator of the present invention.

[0016] Figure 2 It is an axial view of an anti-jamming electromagnetic actuator of the present invention.

[0017] Figure 3 It is a schematic working principle diagram of an anti-jamming electromagnetic actuator of the present invention (the one-way partition element is in the closed state, Embodiment 1).

[0018] Figure 4 Schematic diagram of the working principle of an anti-stall electromagnetic actuator of the present invention (the one-way blocking element is in the open state, Embodiment 1).

[0019] Figure 5 Schematic diagram of the working principle of an anti-stall electromagnetic actuator of the present invention (the one-way blocking element is in the open state, Embodiment 2).

[0020] Component marking names in the figure: 1 - sealing ring, 2 - coil assembly, 3 - one-way blocking element, 4 - guiding ball, 5 - ejector pin, 6 - fixed iron core, 7 - valve housing, 8 - moving iron core, 9 - yoke plate, 10 - outer housing, 11 - axial guiding sleeve, 12 - internal movement space of the moving iron core, 13 - discharge channel, 31 - axial hole, 32 - axial surface, 33 - inner surface, 34 - buckle, 35 - relief groove, 51 - limiting step, 61 - air vent and oil drain hole, 81 - guiding groove. Detailed embodiments

[0021] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] As shown in Figure 1 、 Figure 2 The anti-stall electromagnetic actuator mainly includes a coil assembly 2, a one-way blocking element 3, an ejector pin 5, a fixed iron core 6, a valve housing 7, a moving iron core 8, a yoke plate 9 and an outer housing 10. The valve housing 7 is fixedly connected to the outer housing 10 and forms a hollow cavity structure. The coil assembly 2, the fixed iron core 6, the moving iron core 8 and the yoke plate 9 are all located in the hollow cavity, and an internal movement space 12 of the moving iron core is formed between the fixed iron core 6 and the moving iron core 8. One end of the ejector pin 5 is fixedly connected to the moving iron core 8, and the other end penetrates through the one-way blocking element 3 and the fixed iron core 6. An air vent and oil drain hole 61 is formed on the fixed iron core 6, and a sealing ring 1 is arranged on the outer circumference of the valve housing 7. The one-way blocking element 3 is arranged outside the fixed iron core 6, and the one-way blocking element 3 is used to prevent the oil outside the fixed iron core 6 from flowing through the air vent and oil drain hole 61 into the internal movement space 12 of the moving iron core, while the oil in the internal movement space 12 of the moving iron core can act on the one-way blocking element 3 through the air vent and oil drain hole 61 and enter the outside of the fixed iron core 6 through the discharge channel 13 between the one-way blocking element 3 and the valve housing 7.

[0023] Embodiment 1

[0024] As shown in Figure 2 、 Figure 3 、 Figure 4As shown, an axial hole 31 is formed in the one-way partition element 3. The moving iron core 8 is fixedly connected to the ejector pin 5. The ejector pin 5 penetrates the axial hole 31 and forms a relative sliding fit structure with the one-way partition element 3. Usually, a limiting step 51 can be formed on the ejector pin 5. The limiting step 51 limits the axial stroke of the one-way partition element 3. That is, the one-way partition element 3 can axially slide relative to the ejector pin 5, and its axial sliding stroke is limited by the limiting step 51 on the ejector pin 5.

[0025] After the electromagnetic actuator is powered on, the coil assembly 2 therein generates a magnetic field. The magnetic force lines magnetize the moving iron core 8 after passing through the valve housing 7 and the yoke plate 9. The opposite poles of the fixed iron core 6 and the moving iron core 8 attract each other. The moving iron core 8 is pulled to the extended state. The end of the ejector pin 5 bears the spring force load of the oil control valve and the electromagnetic driving force generated by the coil assembly. By adjusting the input signal of the coil, the axial position of the oil control valve is controlled, and the opening size of the regulating port of the control valve is adjusted to achieve the adjustment of the phase of the camshaft phase adjuster.

[0026] After the engine is started, the oil discharged from the camshaft phase adjusting oil control valve flushes on the axial surface 32 of the one-way partition element 3. The one-way partition element 3 axially slides relative to the ejector pin 5 under the action of the hydraulic thrust from the axial surface 32 until the air vent and oil drain hole 61 on the fixed iron core 6 is closed. At this time, the oil outside the fixed iron core 6 cannot enter the internal movement space 12 of the moving iron core through the air vent and oil drain hole 61. Therefore, the oil and impurities outside the fixed iron core 6 can be effectively prevented from entering the electromagnetic actuator.

[0027] When the electromagnetic actuator is in the working state, the moving iron core 8 assembly extends and squeezes the oil in the internal movement space 12 of the moving iron core. Then, the oil in the internal movement space 12 of the moving iron core acts on the inner surface 33 of the one-way partition element 3 through the air vent and oil drain hole 61. The hydraulic pressure of the oil pushes the one-way partition element 3 to axially slide. When the hydraulic pressure is greater than the scouring force of the oil in the space outside the fixed iron core 6, the air vent and oil drain hole 61 opens, and a discharge channel 13 is formed between the one-way partition element 3 and the valve housing 7, as Figure 4 shown. At this time, the oil in the internal movement space 12 of the moving iron core can flow through the air vent and oil drain hole 61 and the discharge channel 13 in sequence and then enter the space outside the fixed iron core 6. After the oil flowing out from the discharge channel 13 enters a larger free space, it becomes a free falling state without pressure. The axial velocity of the particles such as impurities in the oil is lost due to collision, so that the oil and impurities both freely fall into the oil pan. Therefore, even when the air vent and oil drain hole 61 is in the open state, the one-way partition element 3 can maximally prevent the oil and impurities outside the fixed iron core 6 from entering the internal space of the electromagnetic actuator.

[0028] In order to effectively avoid the problem that the movement of the moving iron core 8 is blocked due to impurities brought about by the wear of internal components of the electromagnetic actuator, the moving iron core 8 can be movably installed in the inner cavity of the axial guide sleeve 11. The axial guide sleeve 11 is fixedly installed between the valve housing 7 and the outer housing 10, and a clearance fit structure is formed between the moving iron core 8 and the axial guide sleeve 11. Further, a guide groove 81 is formed on the moving iron core 8, and a guide ball 4 is arranged in the guide groove 81. The guide ball 4 forms a rolling friction structure with the moving iron core 8 and the axial guide sleeve 11 respectively, as Figure 1 shown. Generally, the guide ball 4 is made of a steel ball. A plurality of guide grooves 81 are formed on the moving iron core 8, and the plurality of guide grooves 81 are evenly distributed around the moving iron core 8. With such a structural design, on the one hand, the movement smoothness of the moving iron core 8 can be improved, and on the other hand, the problem that the movement of the moving iron core 8 is blocked due to impurities can be effectively avoided, which is beneficial to improving the service life of the electromagnetic actuator and reducing the maintenance cost.

[0029] Embodiment 2

[0030] As Figure 5 shown, one end of the one-way baffle element 3 is connected to the fixed iron core 6, and the other end is a free end covering the air-eliminating and oil-draining hole 61. A discharge channel 13 is formed between the free end of the one-way baffle element 3 and the valve housing 7. Particularly, the discharge channel 13 is always in communication with the external space of the fixed iron core 6, and the outlet of the discharge channel 13 is preferably arranged at the lowest point of the geographical position after the electromagnetic actuator is installed. Generally, one end of the one-way baffle element 3 forms a buckle 34, and the buckle 34 is connected to the fixed iron core 6. Further, a relief groove 35 can be formed on the buckle 34, a clamping groove matching the buckle 34 is formed on the fixed iron core 6, and an elastic clamping structure is formed between the buckle 34 and the corresponding clamping groove on the fixed iron core 6. Other structural designs are the same as those in Embodiment 1 and will not be elaborated here.

[0031] After the engine is started, the oil discharged from the camshaft phase adjustment oil control valve flushes on the axial surface 32 of the one-way baffle element 3. The axial velocity of the impurities in the oil is lost due to collision, and finally, under the action of gravity and the oil flushing force, it will fall into the oil pan and will not enter the internal movement space 12 of the moving iron core through the air-eliminating and oil-draining hole 61. When the electromagnetic actuator extends the ejector pin 5, the moving iron core 8 assembly will squeeze the oil in the internal movement space 12 of the moving iron core, so that part of the oil flows through the air-eliminating and oil-draining hole 61 and the discharge channel 13 in sequence and is discharged to the external space of the fixed iron core 6.

[0032] It should be noted that the one-way partition element 3 is preferably made of a non-magnetizable material, so that impurities such as iron powder in the engine oil will not be adsorbed when flushed to its outer surface. When flushed by the oil fluid, the iron powder and other impurities can freely fall into the oil pan, which is beneficial to avoid the movement of the moving iron core 8 being blocked due to the invasion of external impurities, and thus is also beneficial to improving the service life of the electromagnetic actuator and reducing its maintenance cost.

[0033] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. It should be pointed out that any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included within the protection scope of the present invention.

Claims

1. An anti-stall electromagnetic actuator, comprising a fixed iron core (6), a valve housing (7), a moving iron core (8) and an outer housing (10), wherein the valve housing (7) is fixedly connected to the outer housing (10), and a moving iron core internal movement space (12) is formed between the fixed iron core (6) and the moving iron core (8), and is characterized in that: It further includes a one-way partition element (3), and the one-way partition element (3) is arranged outside the stationary iron core (6). An air-venting and oil-draining hole (61) is formed on the stationary iron core (6), and the one-way partition element (3) prevents the oil outside the stationary iron core (6) from flowing through the air-venting and oil-draining hole (61) into the internal movement space (12) of the moving iron core. The oil in the internal movement space (12) of the moving iron core acts on the one-way partition element (3) through the air-venting and oil-draining hole (61), and enters the outside of the stationary iron core (6) through the discharge channel (13) between the one-way partition element (3) and the valve housing (7); An axial hole (31) is formed on the one-way partition element (3). The moving iron core (8) is fixedly connected to the thimble (5), and the thimble (5) penetrates through the axial hole (31) and forms a relative sliding fit structure with the one-way partition element (3); the one-way partition element (3) is made of a non-magnetizable material; A limiting step (51) is formed on the thimble (5), and the limiting step (51) limits the axial stroke of the one-way partition element (3).

2. The anti-stall electromagnetic actuator according to claim 1, characterized in that: One end of the one-way partition element (3) is connected to the stationary iron core (6), and the other end is a free end covering the air-venting and oil-draining hole (61). A discharge channel (13) is formed between the free end of the one-way partition element (3) and the valve housing (7).

3. The anti-sticking electromagnetic actuator according to claim 2, wherein: A buckle (34) is formed at one end of the one-way partition element (3), and the buckle (34) is connected to the stationary iron core (6).

4. The anti-stall electromagnetic actuator according to claim 3, characterized in that: A relief groove (35) is formed on the buckle (34), and a clamping groove matching the buckle (34) is formed on the stationary iron core (6). An elastic clamping structure is formed between the buckle (34) and the corresponding clamping groove on the stationary iron core (6).

5. An anti-stall electromagnetic actuator according to any one of claims 1-4, characterized in that: The moving iron core (8) is movably installed in the inner cavity of the axial guide sleeve (11). The axial guide sleeve (11) is fixedly installed between the valve housing (7) and the outer housing (10), and a clearance fit structure is formed between the moving iron core (8) and the axial guide sleeve (11).

6. An anti-stall electromagnetic actuator according to claim 5, characterized in that: A guide groove (81) is formed on the moving iron core (8), and a guide ball (4) is arranged in the guide groove (81). The guide ball (4) forms a rolling friction structure with the moving iron core (8) and the axial guide sleeve (11) respectively.

7. An anti-stall electromagnetic actuator according to claim 6, characterized in that: A plurality of guide grooves (81) are formed on the moving iron core (8), and the plurality of guide grooves (81) are evenly distributed around the moving iron core (8).

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