CN2355107Y - Electromagnetic valve for fuel shutoff of two function diesel engine - Google Patents

Abstract

The utility model relates to an electromagnetic valve for fuel shutoff of two-function diesel engine. The utility model is characterized in that a piston (8) is arranged in a core of a coil (1), the head part of the piston is relative to the terminal of an adjusting rack (22) on the oil pump, a spindle (7) is arranged in the hollow head of the piston (8), and a slip joint (4) and a supporting spring (6) are arranged on the hollow head of the spindle (7). In the natural state that the coil is de-energized, the piston forward extends under the action of return springs (3, 3'), and push the adjusting rack (22) to the position of fuel cut-off; when the engine operates, the piston (8) is attracted receding by a coil (10), and the slip joint (4) relatively extends the head of the piston (8) and act on the terminal of the adjusting rack (22) with appropriate elastic force; in this way, the utility model can automatically realize the goal of automatical fuel cut-off and flameout, but also can realize the goal that the black tail gas can be eliminated.

Description

Difunctional oil cut-off solenoid valve for diesel engine

The utility model relates to a kind of motorized vehicles and vessels and the engineering machinery flame-out solenoid valve of diesel engine oil-break.

Current also have many motorized vehicles and vessels such as tractor to adopt diesel engine as power source, but because diesel engine adopts the ignition by compression mode, diesel engine is flame-out not only will turn off electric switch so make, also must cut off oil pump feed, traditional mode has steel wire plug-type, pressurized air controlling type and solenoid valve push button, all need additionally to do the flame-out action of pull bar oil-break, particularly use the most general plug-type needs of steel wire always with pulling until engine misses, it is very inconvenient to operate, and can not only need the switch electric switch just can light a fire automatically as petrol engine, flame-out.The Synchro-Start Products company of the U.S. designs and has produced a kind of Fuel Cut Solenoid Valve of two coil configuration for this reason, the piston that it includes a heavy current hauling-eye and a light current hold-in winding and is subjected to this two coil control, the time relay on the diesel engine is connected on the hauling-eye loop, the switch of diesel engine is then as the main switch of described hauling-eye and hold-in winding, when the diesel engine electric switch is opened, hauling-eye and hold-in winding are switched on simultaneously, hauling-eye produces maximum magnetic force inspiration piston under the heavy current state, unclamp the oil-break pull bar, open oil circuit, hold-in winding continues to keep piston to be in fallback state under the light current effect, make oil circuit keep unimpeded, hauling-eye outage automatically under time relay control simultaneously, and when electric switch cuts out, hold-in winding also cuts off the power supply, piston just protracts under its action of reset spring, pulling oil-break pull bar, close oil circuit; This Fuel Cut Solenoid Valve has changed traditional oil-break control mode fully, it is the good product that updates, but it still exists defective: must finally connect the original oil-break pull bar of diesel engine in as installed, thereby connect transmission part such as connecting rod etc. by extra, both needed during installation to guarantee that connecting rod had certain axial precision, need certain extra installing space again, and not all vehicle can both provide such installation conditions, this implements to have brought inconvenience for concrete the installation, also uses to the all-round popularization of this solenoid valve and brings restriction.

For this reason, the utility model is conceived to the high pressure oil pump of diesel engine, controls what of fuel feeding by a stroke of regulating tooth bar in oil pump, only needs to be pushed into the oil-break position to this tooth bar and can make the diesel engine oil-break flame-out.Existing diesel engine oil pump roughly has two classes, and a class is not have the smog limiter, and the stroke of regulating tooth bar is built among the oil pump case, also applies for a patent separately at our existing special design proposal of this class; Another kind of is that the stroke of tooth bar one end protrudes in outside the oil pump case, and the utility model promptly is primarily aimed at this class.

The design origin that has the oil pump of smog limiter is: when engine running, regulate tooth bar even open the throttle when increase fuel delivery direction moves, engine speed rises rapidly, in order to control the racing of the engine running, also be provided with a centrifugal governor device on the oil pump, the position of may command tooth bar, rotating speed is high more, tooth bar is subjected to the effect of centrifugal governor device obvious more, until reaching balance; Under the heavy load situation, or in anxious accelerating process, when the driver opens the throttle, because engine speed is unable to lift quickly, the effect of centrifugal speed governor has the process of a hysteresis, under this situation, because rotating speed is low, cause the firing chamber aeration quantity to reduce, and fuel delivery is excessive, makes mixed air out of proportion, it is insufficient to burn, tail gas row black smoke, tail gas smog limiter are exactly to give additional resistance of tooth bar when the centrifugal speed governor effect lags behind, the purpose of reduce fuel delivery to reach, eliminating black tail gas.

The purpose of this utility model just is to regulate for the fuel feeding that a kind of direct control diesel engine high pressure oil pump is provided at above-mentioned prior art present situation the difunctional Fuel Cut Solenoid Valve of tooth bar, it both can directly control the oil pump oil-break, can when increasing fuel delivery rapidly, oil pump provide suitable resistance by the adjusting tooth bar to oil pump again, thus the suitable fuel delivery of control oil pump.

Design proposal of the present utility model is: difunctional oil cut-off solenoid valve for diesel engine comprises by front case, the housing that rear case and rear end cover constitute, in rear case, be provided with the coil winding that comprises heavy current hauling-eye and light current hold-in winding parallel with one another, one piston of being made by permeability magnetic material is positioned at coil core, it is characterized in that described piston hollow, be provided with a mandrel in it, the anterior hollow of mandrel also is provided with slip joint and supported spring: under nature, described piston protracts under the effect of its Returnning spring, described slip joint then contracts in piston crown, and when contracting after piston is held by coil, described slip joint then stretches out piston crown.

Compared with prior art, the utility model only need be backed out the smog limiter of crude oil pump adjusted tooth bar afterbody when using, screw on Fuel Cut Solenoid Valve of the present utility model and get final product, and is easy to install, quick; During use, the driver only need turn-off the coil blackout that switch makes Fuel Cut Solenoid Valve, can make the adjusting tooth bar that the piston of Fuel Cut Solenoid Valve protracts oil pump be pushed into the oil-break position, realizes that oil-break is flame-out; And when motor moves, piston is attracted then to contract by coil, make the slip joint that is positioned at piston stretch out piston crown, under the effect of its supported spring, suitable elastic force is acted on the end that oil pump is regulated tooth bar, play the obstruction oil pump and increase the effect of fuel feeding rapidly, thereby reach the purpose of eliminating black tail gas.

Description of drawings:

Fig. 1 is the structure cross-sectional schematic (piston is in the overhanging state of nature) of the utility model most preferred embodiment.

Fig. 2 is installed in structure cross-sectional schematic (piston is in the state that is held by coil) on the oil pump for the utility model most preferred embodiment.

Fig. 3 is another embodiment's of the utility model a structure cross-sectional schematic.

Embodiment is described in further detail the utility model below in conjunction with accompanying drawing.

As shown in Figure 1 and Figure 2, difunctional oil cut-off solenoid valve for diesel engine includes the housing that front case (1), inner end cap (5), rear case (9) and rear end cover (14) constitute, in rear case (9) cavity, be provided with the coil winding (10) and the winding support (11) thereof that comprise heavy current hauling-eye parallel with one another and light current hold-in winding, one piston of being made by permeability magnetic material (8) is positioned at coil (10) in-core, piston (8) hollow, be provided with a mandrel (7) in it, the anterior hollow of mandrel (7) also is provided with slip joint (4) and supported spring (6).Under nature, described piston (8) protracts under the support of Returnning spring (3), described slip joint (4) then contracts in piston (8) head, as shown in Figure 1, and when after piston (8) is held by coil (10), contracting, described slip joint (4) then stretches out piston (8) head, as shown in Figure 2, its extension is regulated outside housing by the adjusting nut (16) of its afterbody, (12) are the piston guide tube among the figure, and (13) are the lead of drawing of coil, and (15) are packing ring, (17) be locking cap, (18) fill glue for sealing.

In the present embodiment, described piston reset spring (3) one ends withstand on the inner end cap (5), the other end withstands on piston (8) head (being magnetism resistent ring (2)), can certainly do other different settings, particularly under the situation of omitting inner end cap (5), another kind of set-up mode promptly is provided as shown in Figure 3, and promptly Returnning spring (3 ') is arranged on the afterbody of piston (8), and its other end is against on the rear end cover (14); (19) are the back dust-proof cover among the figure.

Because piston (8) is made by permeability magnetic material, when coil (10) energising work, piston (8) also has been with magnetic when being held, be not subjected to magnetic interference for making oil pump regulate tooth bar, should one magnetism resistent ring of being made by non-magnet material (2) be set at piston (8) head, as Figure 1-3, magnetism resistent ring (2) is threaded in the head of piston (8), should regulate slip joint (4) when contracting this moment after piston (8) is held and stretch out outside the magnetism resistent ring (2);

The setting of the utility model inner end cap (5) is an optimum scheme, if for the consideration of aspect factors such as manufacture cost also can omit need not, just effect may be relatively poor; Described inner end cap (5), rear case (9) and rear end cover (14) are preferably made with permeability magnetic material, with the pure iron is best, the three unites magnetic loop cavity of formation like this, add the magnetism resistent ring (2) of piston (8) head, with eliminating magnetic up hill and dale oil pump is regulated the influence of tooth bar, thereby ensure the normal fuel-flow control of diesel engine when running well.

During installation, back out the smog limiter of oil pump (20) adjusted tooth bar (22) afterbody, front case of the present utility model (1) directly is spun on the link (21), shown in Fig. 2,3, so piston (8) head i.e. adjusting tooth bar (22) with oil pump is relative; When the diesel engine electric switch is opened, hauling-eye and hold-in winding are switched on simultaneously, hauling-eye produces maximum magnetic force inspiration piston (8) under the heavy current state, hauling-eye cuts off the power supply automatically then, and continuing the state that contracts after maintenance piston (8) is under the light current effect by hold-in winding, thereby leave oil pump for and regulate the enough stroke spaces of tooth bar (22), to guarantee that motor has enough fuel deliveries, make oil circuit keep unimpeded, slip joint this moment (4) stretches out piston (8) head, be against and regulate the terminal of tooth bar (22) and under the effect of its supported spring (6), apply suitable elastic force to regulating tooth bar (22), play the obstruction oil pump and increase the effect of fuel feeding rapidly, thereby reach the purpose of eliminating black tail gas; When electric switch cuts out, hold-in winding also cuts off the power supply, and piston (8) just protracts under its Returnning spring (3,3 ') effect, and slip joint (4) i.e. is retraction piston (8) head relatively, piston (8) will be regulated tooth bar (22) and push up dotted line oil-break position to the figure, thereby close oil circuit, engine misses.

Claims (6)

1. difunctional oil cut-off solenoid valve for diesel engine, comprise by front case (1), the housing that rear case (9) and rear end cover (14) constitute, in rear case (9), be provided with the coil winding (10) that comprises heavy current hauling-eye parallel with one another and light current hold-in winding, one piston of being made by permeability magnetic material (8) is positioned at coil core, it is characterized in that described piston (8) hollow, be provided with a mandrel (7) in it, the anterior hollow of mandrel (7) also is provided with slip joint (4) and supported spring (6): under nature, described piston (8) is at its Returnning spring (3,3 ') protract under the effect, described slip joint (4) then contracts in piston (8) head, and when contracting after piston (8) is held by coil (10), described slip joint (4) then stretches out piston (8) head.

2. difunctional oil cut-off solenoid valve for diesel engine as claimed in claim 1 is characterized in that being provided with an inner end cap (5) at described front case (1) and rear case (9) link position, and the inner chamber of front case (1) with rear case (9) separated.

3. difunctional oil cut-off solenoid valve for diesel engine as claimed in claim 2 is characterized in that described piston reset spring (3) one ends withstand on the inner end cap (5), and the other end withstands on the magnetism resistent ring (2) of piston (8) head.

4. as claim 2 or 3 described difunctional oil cut-off solenoid valve for diesel engine, it is characterized in that described inner end cap (5), rear case (9), rear end cover (14) made by permeability magnetic material.

5. difunctional oil cut-off solenoid valve for diesel engine as claimed in claim 1 is characterized in that described piston reset spring (3 ') is arranged on the afterbody of piston (8), and its other end is against on the rear end cover (14).

6. as claim 1 or 5 described difunctional oil cut-off solenoid valve for diesel engine, it is characterized in that described rear case (9), rear end cover (14) made by permeability magnetic material.

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