DE102009045894A1 - Metal swing frame, has floor anchor attached to frame upper portion, pipe provided on plate for holding swing, and rod obliquely fixed to plate, where rod lies on barrel - Google Patents

Abstract

The frame has a floor anchor attached to a frame upper portion. A pipe is provided on a plate for holding a swing. A coil is rotated oblique to a base. A rod is obliquely fixed to the plate, where the rod lies on a barrel. The pipe and the frame are fixedly connected with a screw nut such that the frame is anchored. A shoe is stretched and fixed in the pipe.

Description

Technical area

The invention relates to a fuel injection system, in particular a common rail injection system, with a valve having an inflow opening and an outflow opening for fuels and a movable closing body for selectively closing and opening the outflow opening.

State of the art

In high pressure areas of fuel injection systems, particularly in common rail injection systems, pressure pulsations in fuel lines may occur. These pressure pulsations can be caused for example by a pilot injection. Furthermore, an elasticity of the lines or a compressibility of the fuel may contribute to the formation of the pulsations. The pulsations can propagate especially in leak oil lines and meet check valve, which is located there between injectors and a fuel tank. When the pulsations hit the check valve, the pressure of the fuel fluctuates therewith in such a way that the function of the check valve may possibly be restricted.

Out DE 10 2007 004 553 A1 a ball seat valve for adjusting a flow of a fluid medium is known. The ball seat valve has a valve seat and a rounded closing element, in particular a valve ball. Furthermore, the ball seat valve has an inlet with a pre-throttle and a arranged between the pre-throttle and the valve seat diffuser. The diffuser has a constriction on a side facing the valve seat. By means of the proposed ball seat valve, the flow of the fluid medium should be able to be adjusted.

Out DE 101 52 173 A1 a solenoid valve for controlling an injection valve of a fuel injection device is known, wherein the magnetic valve has a valve ball which can be applied to a valve seat of a discharge chamber. The valve seat is in fluid communication via a bore with a control pressure chamber of the injection valve. The bore has at least in part one or more in the direction of the valve seat continuously in cross-section widening sections.

Disclosure of the invention

According to the invention, a fuel injection system, in particular a common-rail injection system, is provided with a valve having an inlet opening and an outflow opening for fuels and a movable closing body for selectively closing and opening the outflow opening, wherein the outflow opening is formed in a lateral surface of a cylinder as a movable closing body, a piston against a counter force is displaceable, which releases the discharge opening after a predetermined stroke.

The fuel injection system according to the invention is provided with a valve capable of damping pulsations of fuels in fuel lines. Gasoline or diesel fuels are used as fuels. A pulsation in the present case is to be understood as a pressure surge, which may arise, for example, as a result of a rapid opening or closing of a third valve, such as an injector of injectors. The kinetic energy of the fuel moving in the fuel line causes a very rapid increase in the pressure in the fuel line due to the generally low compression modulus of fuels, resulting in the surge.

In order to achieve a damping effect of pulsations, the valve according to the invention has an inflow opening and an outflow opening for fuels and a movable closing body for opening or closing the outflow opening. According to the invention, the outflow opening is formed in a lateral surface of a cylinder. Within the cylinder, a piston moves as a closing body, wherein the piston with the lateral surface of the cylinder at least partially has a contact surface. The piston is displaceably mounted against a defined counterforce and can release the outflow opening after passing through a predetermined stroke. So that the piston releases the outflow opening after passing through the predetermined stroke, he must perform a defined by the opposing force lifting. This lifting work must be effected with the fuel flowing into the valve or into the cylinder, but with the kinetic energy of the pressure surge or the pulsation. The closing body or piston is thus raised by the pressure surge. If the kinetic energy of the pulsation is sufficiently high, the piston passes through the required stroke and releases the outflow opening. As a result of the conversion of the kinetic energy of the pulsation in lifting, the pulsation of the fuel flowing through the valve is attenuated according to the invention.

According to a first advantageous development of the fuel injection system according to the invention, the piston is biased by means of at least one spring with a certain spring force as a counterforce and the spring force is adjusted such that it dampens pulsations of the fuel.

In the present case, the counterforce is provided by one or more springs. The at least one spring provides a certain spring force, which is preferably adapted to the kinetic energy of the pulsation of the fuel flowing through the valve. The spring may for example be a coil spring or a leaf spring. Preferably, the spring is a helical spring and the length of the shortening of the spring at pressure corresponds to the stroke of the piston to be traversed to release the discharge port. The spring constant is thus adapted to the kinetic energy of the pulsation to be damped. The at least one spring is preferably formed from a fuel inert material.

According to a second advantageous embodiment of the fuel injection system according to the invention, the piston is designed on its lateral surface with a passage opening which can be brought into overlap with the outflow opening in the cylinder.

In such a development, the work to be done by the piston to the pulsation of the fuel can be further adjusted, that is, with a predetermined arrangement of the outflow opening in the lateral surface of the cylinder, a given reaction force and a given length of the piston, that of the piston to be passed stroke to be reduced. For this purpose, the piston has a passage opening into which the fuel can flow from the inlet opening. If the fuel flows into the passage opening, it exerts a pressure on the piston within the passage opening. The piston performs lifting work until the piston is raised so far that the passage opening is at least partially brought into line with the outflow opening in the cylinder. The fuel in the piston then flows out of the passage opening through the discharge opening out of the valve.

According to a third advantageous development of the fuel injection system according to the invention, the piston has a passage opening for the fuel, which extends from one side of the piston, on which the inflow opening is arranged, to another side.

Such a configuration allows a further adaptation of the damping property of the valve. By receiving a through opening for the fuel in the piston, a pressure balanced system is first provided. If the fuel has a low pulsation or if the kinetic energy of the fuel is low, the fuel flows unhindered through the passage opening and leaves the valve without the piston performing a lifting operation. Damping does not take place in this case. If the kinetic energy of the fuel increases or the pulsation reaches a level at which the fuel no longer flows unhindered through the passage opening only, a certain pressure is exerted on the piston. This pressure causes the piston to perform a certain lifting work and release the outlet opening in the lateral surface of the cylinder when passing through a predetermined stroke. Thus, in the present case, attenuation is made available only with stronger pulsation.

According to a fourth advantageous development of the fuel injection system according to the invention, the outflow opening is designed to damp the pulsations with a certain number of individual openings.

In this development, the outflow opening has a plurality of individual openings. With the choice of the number of individual openings, the amount of fuel flowing through the outflow opening per unit time and thus the damping characteristic of the valve can be adjusted.

According to a fifth advantageous development of the fuel injection system according to the invention, the outflow opening is designed to damp the pulsations with a specific size.

With the choice of the size of the outflow opening, the amount of fuel flowing through the outflow opening per unit time and thus the damping characteristic of the valve can also be adjusted to the prevailing pulsation of the fuel.

According to a sixth advantageous development of the fuel injection system according to the invention, the outflow opening for damping the pulsations is designed with at least one specific shape.

The outflow opening may have different shapes and advantageously be substantially circular, square, rectangular or triangular. The shape of the outflow opening can also be composed of a combination of various individual shapes, such as circles, squares, rectangles or triangles. In this way, the outflow amount of fuel per unit time and thus the vaporizing property of the valve can also be adjusted.

According to a seventh advantageous development of the fuel injection system according to the invention, the outflow opening for damping the pulsations is designed by a specific positioning of at least one individual opening.

The positioning of the at least one individual opening can determine the lifting work to be performed by the piston. If the piston has to cover a larger stroke in order to release the outlet opening, the pulsation of the fuel is damped to a greater extent than if the piston covers a smaller stroke. Furthermore, a plurality of individual openings with the same or different shape may also have different positions. Thereby, the amount of fuel flowing through the valve per unit time and the damping characteristic of the valve can be regulated.

According to an eighth advantageous development of the fuel injection system according to the invention, the outflow opening is designed such that it has an opening portion of a certain size in the stroke direction, then an opening portion having a reduced size in the stroke direction and then an opening portion having a further reduced size in the stroke direction.

In such a development, a relatively large opening portion is first released when performing a predetermined stroke by the piston, through which a relatively large amount of fuel per unit time can flow. This means that initially a lower damping property of the valve is provided. If the fuel flowing into the valve exerts a pressure on the piston which allows the piston to be raised further, a smaller opening section is released, which limits the flow rate of fuel and dampens the pulsation of the fuel more strongly. If the piston is raised further, the released opening section continues to decrease and the damping characteristic continues to increase. The last opening section preferably ensures only a minimum flow of the fuel. With this development, vibrations of the piston are largely prevented when the outlet opening is released or provided a particularly advantageous throttling effect of the valve.

According to a ninth advantageous development of the fuel injection system according to the invention, the valve is arranged in a fuel line between injectors and a fuel tank.

It is particularly advantageous in fuel lines that are disposed between injectors and a fuel tank when pulsations of fuels flowing in these fuel lines can be damped. Undamped pulsations can also be reflected at line junctions, hit by the injectors, causing pressure fluctuations there and thus affecting the functioning of the injectors.

Brief description of the drawings

Exemplary embodiments of the solution according to the invention will be explained in more detail below with reference to the attached schematic drawings. Show it:

1 a longitudinal section of a first embodiment of a valve according to the invention in two switching positions,

2 a longitudinal section of a second embodiment of a valve according to the invention in two switching positions,

3 a longitudinal section of a third embodiment of a valve according to the invention in two switching positions,

4 a longitudinal section of a fourth embodiment of a valve according to the invention in two switching positions,

5 a side view of a first embodiment of a lateral surface of a cylinder,

6 a side view of a second embodiment of a lateral surface of a cylinder,

7 a side view of a third embodiment of a lateral surface of a cylinder,

8th a side view of a fourth embodiment of a lateral surface of a cylinder,

9 a side view of a fifth embodiment of a lateral surface of a cylinder and

10 a schematic representation of a common rail injection system according to the invention.

Description of embodiments

1 shows a valve 10 that is a cylinder 12 , one in the cylinder 12 slidably arranged piston 14 , a feather 16 , an inflow opening 18 and two outflow openings 20 for fuel includes. The cylinder 12 has a lateral surface 22 on, with which the piston 14 a touchpad 24 forms. In the cylinder 12 leads the inflow opening 18 on the front side and the outflow openings 20 lead to the lateral surface 22 arranged out of the cylinder 12 out. The piston 14 is in the cylinder 12 designed to be displaceable as a movable closing body. He can thereby the outflow openings 20 close and open. Above the piston 14 is the spring 16 arranged on the piston 14 exerts a predetermined spring force and at a pressure-free valve 10 the piston 14 so far in the cylinder 12 pushes that outflow openings 20 are closed.

On the left in 1 is the valve 10 with closed discharge opening 20 shown. Flows fuel through the inlet 18 in the cylinder 12 into it, so the fuel exerts a pressure on the piston by means of its kinetic energy or by means of pulsation 14 out. As a result of pressure the piston performs 14 a lifting job and overcomes the drag that the spring 16 on the piston 14 exercises. The piston 14 goes through a hub 26 and gives the outflow openings 20 free. The fuel can through the outflow openings 20 out of the valve 10 escape (see right side in 1 ). Due to the fact that the fuel flows through the valve 10 a lifting work on of the spring 16 preloaded piston 14 the pulsation of the fuel is damped.

Furthermore, it is advantageous that due to the relatively large contact surface 24 between the piston 14 and the cylinder 12 a leakage of fuel is minimized. By means of the contact surface 24 This can essentially be an uncontrolled leakage of fuel from the valve 10 be prevented.

2 shows a further embodiment of a valve 10 , The valve 10 is like the valve 10 in 1 designed, but also includes in the piston 14 a passage opening 28 for fuel. The passage opening 28 extends from an end face of the piston 14 , the inlet opening 18 facing to a position inside the piston 14 and from there radially outward as two passageways, which then on the lateral surface 31 of the piston with the outflow openings 20 by a stroke movement of the piston 14 can be brought in overlap. On the left in 2 is the valve 10 shown in the closed state and on the right in the open state.

The through the inlet opening 18 in the cylinder 12 inflowing fuel flows, inter alia, into the passage opening 28 , Characterized in that a part of the fuel first from the passage opening 28 is absorbed, the pressure on the piston 14 on the one hand exercised a little time-delayed. On the other hand, the piston must 14 to the discharge opening 20 release, do a smaller lifting job. The hub 26 that from the piston 14 must be passed through the passage opening 28 with the discharge opening 20 is in agreement, is lower and is thus adapted to a lower pulsation of the fuel. The damping characteristic of such a valve 10 is lower.

3 shows a valve 10 according to 1 where the valve 10 beyond a passage opening 30 for fuel. The passage opening 30 extends from the end face of the piston 14 , the inlet opening 18 in the cylinder 12 opposite, to the opposite end, from where the fuel is the valve 10 can leave. The in the cylinder 12 through the inlet opening 18 inflowing fuel may in part through the port 30 out of the valve 10 escape and exert on the piston 14 no pressure off. Exceeds the amount of in the cylinder 12 however, the amount of fuel flowing through the passage opening 30 can flow in a unit of time, the fuel exerts a pressure on the piston 14 out. The piston 14 performs one of the spring force of the spring 16 accordingly set lifting work and gives the discharge opening 20 in the lateral surface 22 of the cylinder 12 free. It can then fuel through the exhaust ports 20 out of the valve 10 flow out. By means of this valve 10 Thus, a lower damping characteristic is provided.

4 shows a valve 10 according to 3 where the valve 10 a passage opening 30 for fuel. The passage opening 30 extends from the passage opening 28 to the front of the piston 14 on which the spring 16 is arranged and from where the fuel is the valve 10 can leave. The in the passage opening 28 inflowing fuel may in part through the port 30 out of the valve 10 escape and exert on the piston 14 no pressure off. Exceeds the amount of in the cylinder 12 however, the amount of fuel flowing through the passage opening 30 can flow in a unit of time, the fuel again exerts a pressure on the piston 14 out. The piston 14 performs one of the spring force of the spring 16 accordingly adjusted lifting work and can the outflow openings 20 in the lateral surface 22 of the cylinder 12 release. The fuel flows through these outflow openings 20 out of the valve 10 out. By means of this valve 10 an even lower damping characteristic is provided.

5 to 9 show embodiments of different outflow openings 20 ,

5 shows outflow openings 20 with four substantially circular single openings 32 , The single openings 32 are essentially the same size. Do the piston 14 a certain lifting work and gives the piston 14 the outflow openings 20 free, so can one by the geometry of the single openings 32 predetermined amount of fuel from the valve 10 escape.

6 shows an arrangement of individual openings 32 in which the single openings 32 a have different size. Thus, at a given hub 26 a certain amount of fuel escape. Will a higher pressure on the piston 14 exerted and the stroke is thus greater, a larger cross-sectional area is released and a larger amount of fuel can escape. The damping characteristic of such a valve 10 is higher.

7 shows an arrangement of individual openings 32 in which the single openings 32 have a different shape. In the present case, a triangular, a rectangular and a combined of a triangle and a rectangle shape are arranged side by side. Depending on the hub 26 of the piston 14 can different amount of fuel from the individual openings 32 escape. As a result, the damping property of the valve 10 adapted to the strength of the pulsation.

8th shows an arrangement of individual openings 32 with different shapes, with the single openings 32 at a different height on the lateral surface 22 of the cylinder 12 are arranged. In this way, depending on the strength of the pulsation, the flow rate of the fuel through the discharge opening 20 and thus the damping property of the valve 10 be set. If the pulsation of the fuel is higher, a larger amount of fuel passes through the discharge opening 20 out; the damping increases.

9 shows an outflow opening 20 in the stroke direction of the piston 14 First, an opening portion with a relatively large size 34 in the form of a horizontal rectangle, then an opening section of a reduced size 36 in the form of a triangle and then an opening section of a further reduced size 38 in the form of a standing rectangle. At a low lift 26 of the piston 14 thus becomes a large opening section 34 enabled, through which a relatively large amount of fuel in a unit of time can flow. The damping is in this opening section 34 quite high. The further the piston 14 is then lifted, the less fuel can through the following opening sections 36 . 38 due to the decreasing size of the openings escape. This means that the damping decreases as the stroke increases 26 of the piston 14 decreases; The piston 14 is slowed down. Does the fuel on a pulsation, such a force on the piston 14 exerts that opening section with the big size 34 is released, so minor fluctuations in the pulsation strength through the opening sections 36 . 38 be intercepted. Vibrations of the piston 14 can be substantially prevented here. There is provided a kind of throttle effect; The piston 14 is slowed down.

10 shows a fuel injection system according to the invention 50 , in the present case a common rail injection system. The flow direction of the fuel within the fuel injection system 50 is with arrows 51 characterized. The fuel injection system 50 includes a motor unit 60 with a pressure control valve 61 , a motor pump 62 , Cylinders 63 with injectors 64 and a valve 10 , The engine unit 60 gets fuel from a fuel tank 70 provided. The fuel tank 70 includes an electronic fuel pump 71 and a pressure relief valve 72 , Between the fuel tank 70 and the motor unit 60 is a pressure-resistant filter 73 and a fuel cooler 74 arranged.

The electronic fuel pump 71 promotes under high pressure and via the pressure relief valve 72 pressure-regulated fuel via the pressure-resistant filter 73 and the fuel cooler 74 in the motor unit 60 , The fuel also acts as a cooling medium of the electronic fuel pump 71 and takes heat energy from the motor pump 62 on.

If the fuel is the pressure-resistant filter 73 flows through it, it is largely cleaned of impurities. After cleaning, the fuel passes through the fuel cooler 74 which extracts heat from the fuel that it passes through the electronic fuel pump 71 has recorded. One in the fuel cooler 74 arranged temperature sensor 75 continuously collects data on the temperature history of the fuel and sends this data to an engine control unit 76 , The engine control unit 76 determines from the received data whether a defined temperature value is exceeded. If the temperature value is exceeded, the engine control unit controls 76 another control unit 77 on, that's the electronic fuel pump 71 causes a larger amount of fuel than cooling medium through the fuel cooler 74 to pump. The engine control unit 76 thus regulates the temperature of the fuel and protects the fuel injection system 50 from overheating.

After the fuel is the fuel cooler 76 has passed through, the fuel is in the engine unit 60 directed. In the engine unit 60 the fuel is first by means of the pressure control valve 61 set to a predetermined constant pressure; Pressure fluctuations are compensated as far as possible. The motor pump 62 promotes the fuel to the cylinders 63 for combustion.

The cylinders 63 are the injectors 64 assigned to the return connections via fuel lines 65 connected to each other. Excessive and unburnt fuel, so-called leak oil that is not the cylinders 63 is supplied and only the cooling and lubrication of motor pump 62 serves, is over the valve 10 under low pressure in the fuel tank 70 returned.

The valve 10 As explained above, it is adapted to damp pulsations of the fuel. In particular, by means of the valve 10 essentially prevents the pulsations in the return flows between the individual injectors from propagating and influencing the functionality of these injectors by a pressure change.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007004553 A1 [0003]
• DE 10152173 A1 [0004]

Claims (10)

Fuel injection system ( 50 ), in particular common-rail injection system, with a valve ( 10 ) with an inflow opening ( 18 ) and an outflow opening ( 20 ) for fuels and a movable closing body for selectively closing and opening the outflow opening ( 20 ), characterized in that the outflow opening ( 20 ) in a lateral surface ( 22 ) of a cylinder ( 12 ) is formed, in which as a movable closing body, a piston ( 14 ) is displaceable against a counterforce, which after a predetermined stroke ( 26 ) the discharge opening ( 20 ) releases. Fuel injection system ( 50 ) according to claim 1, characterized in that the piston ( 14 ) by means of at least one spring ( 16 ) is biased with a certain spring force as a counterforce and the spring force is adjusted so as to damp pulsations of the fuel. Fuel injection system ( 50 ) according to claim 1 or 2, characterized in that the piston ( 14 ) on its lateral surface ( 31 ) with a passage opening ( 28 ) is designed, which with the outflow ( 20 ) in the cylinder ( 12 ) can be brought into overlap. Fuel injection system ( 50 ) according to one of claims 1 to 3, characterized in that the piston ( 14 ) a passage opening ( 30 ) for the fuel extending from one side of the piston ( 14 ), on which the inflow opening ( 18 ) is arranged to extend to another side. Fuel injection system ( 50 ) according to one of claims 1 to 4, characterized in that the outflow opening ( 20 ) for damping the pulsations with a certain number of individual openings ( 32 ) is designed. Fuel injection system ( 50 ) according to one of claims 1 to 5, characterized in that the outflow opening ( 20 ) is designed to damp the pulsations of a certain size. Fuel injection system ( 50 ) according to one of claims 1 to 6, characterized in that the outflow opening ( 20 ) is designed to damp the pulsations with at least one particular shape. Fuel injection system ( 50 ) according to one of claims 1 to 7, characterized in that the outflow opening ( 20 ) for damping the pulsations by a specific positioning of at least one single opening ( 32 ) is designed. Fuel injection system ( 50 ) according to one of claims 1 to 8, characterized in that the outflow opening ( 20 ) is designed such that in the stroke direction, it first has an opening section with a specific size ( 34 Subsequently, in the stroke direction, an opening portion having a reduced size (FIG. 36 ) and subsequently in the stroke direction an opening section with a further reduced size ( 38 ) having. Fuel injection system ( 50 ) according to one of claims 1 to 9, characterized in that the valve ( 10 ) in a fuel line ( 65 ) between injectors ( 64 ) and a fuel tank ( 70 ) is arranged.

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