DE10315052A1 - Fuel supply system has diesel filter with filtering device accommodated in housing, and displacement registering sensor set to predetermined range and installed on outflow side of filtering device - Google Patents

Abstract

The fuel supply system has a diesel filter with a filtering device accommodated in a housing, and a displacement registering sensor (40) installed on the outflow side of the filtering device. A registering pressure of the sensor is set to a predetermined range which is higher than an initial pressure level which is measured if the diesel filter is in a new state, and lower than a displacement pressure level which is measured if no fuel is being supplied following displacement of the filtering device.

Description

BACKGROUND OF THE INVENTION Field of the Invention

The invention relates to a fuel supply system for a Motor vehicle and affects in a more special way Fuel supply system, which with a diesel filter is equipped and able to move one To capture the filter device precisely.

The present invention further relates to a Diesel filter used in a fuel delivery system Motor vehicle is arranged, and affects in a more special way a diesel filter that has no restrictions regarding the space required to place this filter is.

The present invention further relates to a Fuel filter used in a fuel delivery system for a Motor vehicle is arranged, and affects in a more special way a fuel filter or a diesel filter Filter device replacement design, which is able to prevent fuel in an internal combustion engine in the State is supplied that the filter device with a Filter element is not yet installed.

Comments on the state of the art

Diesel engines are becoming widely used for automobiles widely used.

The diesel internal combustion engines use light oil. The Light oil is pressurized by an injection pump. The pressurized light oil is placed in a combustion chamber the engine is injected and causes Auto ignition if compression is carried out by a piston is.

Fig. 11 shows a conventional fuel supply system having a fuel tank 4, a diesel filter 5, an injection pump 1, a common rail 2 and an injection valve 3. The injection pump 1 is used to supply fuel under high pressure. The injection pump 1 conducts the fuel from the fuel tank 4 via the diesel filter 5 and supplies the pressurized fuel to the injection valve 3 via the common pressure line 2 . The common pressure line 2 distributes the fuel to a large number of injection valves. In FIG. 11, black arrows indicate the fuel flow that is supplied from the fuel tank 4 to the injection valve 3 , while white arrows indicate the flow of the excess fuel that is returned to the fuel tank 4 by the injection pump 1 .

In general, fuel contains foreign substances, such as. B. dusts, solid particles of rust, carbon particles, rubber-like mud and water or moisture components. These foreign matters cause abrasion and stick in the injection valve 3 or the like, and it is accordingly necessary to remove them. In order to avoid this problem, the diesel filter 5 is arranged.

It is generally known that the diesel filter 5 must perform the following three functions. The first function is the function of removing the dusts or solid particles from the fuel supplied to the internal combustion engine to prevent the injection valve 3 or the like from being subject to mechanical abrasion or rusting, and accordingly the durability and stable operation of the internal combustion engine are ensured.

The second function is the function to separate water or moisture components from the fuel. The fuel contains the water, which is generally divided into dissolved water and free water. The dissolved water flows together with the fuel and can be used up completely without remaining in the fuel supply channel. Therefore, there is essentially no damage caused by the dissolved water. On the other hand, the free water has a larger specific weight, which is greater than that of the light oil. Therefore, the free water remains in the injection pump and tends to cause rust and buildup. The fuel can contain free water beforehand. Or rainwater can later be added as free water during the oil supply operation. The moisture components contained in the air can combine and drip into the oil. Furthermore, the dissolved water separates when the temperature of the fuel is low. Accordingly, the diesel filter 5 is provided with a space for separating water. In this way, the free water enters the fuel supply system through various channels. Most of the free water remains at the bottom of the fuel tank. When vibrations are applied while the vehicle is traveling, the lingering water in the fuel tank is fed into the fuel supply system. In any case, the water separation function of the diesel filter 5 is inevitably required.

The third function is the remove function Wax. In general, the wax separates from that Light oil when the temperature is low. In the event that used light oil does not match the temperature, one occurs large amount of wax and can be a filter element Move the filter device. Then the fuel does not flow. The Internal combustion engine stops. Accordingly, even at low temperature function to maintain the appropriate flow capacity of the fuel necessary. Finally, an electric heater or a Bimetal fuel circulation valve for the diesel filter arranged. If the ambient temperature is below one decreases predetermined value, the electric heater switches to heat the filter element. The fuel shows a high temperature when this through the Injection pump is compressed. When the ambient temperature is low enables the above Fuel circulation valve that part of the fuel, which is high Temperature, is kept in circulation. In any case the filter element is heated to prevent displacement.

Fig. 11 shows the circulation channel for the circulating fuel. A bimetallic fuel circulation valve 7 is arranged on a cap of the diesel filter 5 . The fuel injection pump 1 and the bimetallic fuel circulation valve 7 are connected via a fuel return pipe 8 a. If the temperature of the fuel supplied to the diesel filter 5 exceeds a predetermined value, the fuel is returned via a channel of the fuel return pipes 8 a and 8 b to the fuel tank 4 . When the fuel temperature falls below the predetermined value, a bimetal valve opens a bypass channel in the bimetal fuel circulation valve 7 . Part of the hot fuel, which is returned from the fuel injection pump 1 , flows through the fuel return pipe 8 a into the diesel filter 5 . The recirculated hot fuel increases the temperature of the diesel filter 5 and accordingly prevents the low temperature fuel that is introduced into the diesel filter 5 from depositing wax. As is well known, the light oil is divided into five types: Extra No. 1, No. 1, No. 2, No. 3 and Extra No. 3. With regard to the temperature of the dislocation caused by the wax, the No. 1 variety not higher than -1 ° C, the variety No. 2 is not higher than -5 ° C, the variety No. 3 is not higher than -12 ° C and the variety Extra No. 3 is not higher than -19 ° C , There is no dislocation temperature for the Extra No. 1 variety.

As is clear from the foregoing description, the diesel filter is a device required to perform the important role of the three functions described above. That is, considering the appearance of the wax deposition of the fuel caused when water is contained in the fuel or when the temperature is low, the diesel filter must remove the dusts, solid particles from rust, carbon particles and rubbery sludge from the fuel , Furthermore, the diesel filter is required in order to supply pure fuel to the injection valve 3 via the injection pump 1 .

The foreign substances accumulate on the surface of a filter element that is used to remove these substances. Although dependent on the condition of use of the diesel filter, the accumulation of foreign matter increases with the passage of time. And the filter element is finally offset. After the filter element is mixed with the foreign substances, the fuel is no longer fed to the injection valve. A driver who drives the vehicle without knowing this fact is faced with the problem that the internal combustion engine suddenly stops (see Japanese Patent Laid-Open No. 11-270425 ( 1999 )).

In order to avoid this problem, it is conventionally common that the diesel filter needs to be replaced when the time has expired. The test times or replacement intervals the diesel filters are determined based on the assumption that all users of fuels of a low grade or use low quality. In the event that the users who Use high quality fuels whose diesel filters need to be replaced according to the same instructions Change times for these filters too early in comparison with the actual lifespan. As a result, this does one Increase the economic burden on such users.

Even if the times are earlier than their lifespan replace the diesel filter as above explained, definitely better in comparison with the following cases. For example, some users can use the diesel filter continue to use for a long period of time until the Relocate filter elements without the instructions to replace them to follow. Other users can continue the low Use the type of low quality fuel which usually contain a large amount of contaminants. The displacement of the filter element becomes an early one Point in time. If the drivers don't see the reasons can, which is why the performance of the internal combustion engine deteriorated, the drivers will drive the vehicle continue. As a result, the drivers get into the bad Situation that their internal combustion engines suddenly stop.

In addition to the foreign substances described above, calls further a low temperature the displacement of the Diesel filter due to the separation of wax by cooled Fuel. If the ambient temperature is low, the temperature of the fuel decreases accordingly. If the temperature drops below a critical value, at which is the separation of wax from the fuel begins, the wax is deposited on the filter element of the Diesel filter. As a result, the filter element gets into the Displacement state. It goes without saying that the The amount of fuel on the downstream side of the Filter element is actually fed. the downstream side Negative pressure of the filter element increases.

In the event that the filter element is displaced by This element should be caused by a foreign substance new ones will be replaced. However, in the event that the Deposition of wax from the fuel by moving the Filter element is caused is the offset temporarily and disappears with decreasing amount of deposits Wax when the fuel temperature rises. The Filter properties of the element or its performance will soon be restored. For example, the diesel filters significantly influenced by the ambient temperature, immediately after the internal combustion engine has started. Since the Internal combustion engine in such a startup state is not is sufficiently heated, the differs Fuel temperature not so much from the ambient temperature. The The temperature of the diesel filter increases with increasing temperature the internal combustion engine. The separation of wax from the Fuel is decreasing on a large scale. Even if that Filter element temporarily due to the separation of wax from the fuel during the cold start-up operation of the Internal combustion engine is offset, the accordingly warms up Internal combustion engine with the passage of time and the Wax separation disappears. The filter element can from the Dislocation status can be regenerated.

As further described above, the electrical Heater or the fuel circulation valve for circulation of hot fuel widely used to the Prevent wax separation from the fuel. The Use of these devices enables rapid heating of cold fuel and reduces the Wax deposit amount of the fuel in the case that in the cold Starting state of the internal combustion engine does not run out of fuel is sufficiently heated and the filter element as a result of Deposition of wax from the fuel temporarily in the Dislocation is. Therefore, the filter element can immediately turn off the dislocation state can be regenerated.

However, it is difficult for some users to recognize or to assess whether the displacement of the filter element from the Deposition of wax from the fuel as a result of low temperature or not. In the event that this is the operating state of the internal combustion engine deteriorated, the user can assume that there is a serious disturbance the internal combustion engine is and can be fast Visit repair shops. Or users may be wrong Assume that the filter element is completely offset and it is urgent to replace it with a new one. In any case users are faced with economic burdens.

SUMMARY OF THE INVENTION

In view of the problems mentioned above, it is the object of the present invention To create a fuel delivery system that is one Dislocation detection device, which on a downstream side of a Diesel filter for precise detection of the displacement of a Filter element is arranged, and a device to enable the displacement detection device to be active, if the temperature of the fuel is higher than one predetermined temperature value which is higher than one Wax separation temperature is at which wax is generated from the fuel is deposited.

To the above task and others The present invention demonstrates the achievement of objectives in this regard Fuel supply system on which a filter device for filtering fuel, including one Housing element that defines an outer wall, and a Filter device which is accommodated in the housing element, and a displacement detection device mounted on a Downstream side of the filter device is arranged around the Relocate the filter device to detect. With this structure a driver is used to move the filter element an indicator lamp or a warning buzzer. The filter element can be replaced exactly be determined.

It is also preferable that a detection pressure of Displacement detection device in a predetermined range is set, which is higher than an initial pressure value, which is measurable when the filter device in one Is new and lower than a displacement pressure value that is measurable if due to the displacement of the No fuel is supplied to the filter device. With this structure is it is possible considering the actual Optimal use of respective filter elements Determine replacement times. For example, is an earlier one Preferred time for replacement of the filter elements that in Off-road vehicles are used, and a later one Preferred time for replacement of the filter elements that in Road vehicles are used.

It is also preferable that a Operation release device is also arranged to allow the Dislocation detection device is only effective when the Temperature of the fuel higher than a predetermined one Temperature value. With this structure it is possible to prevent the displacement detection device from doing so Transfer due to wax separation from the fuel is recorded incorrectly.

It is also preferable that the predetermined one Temperature value is higher than a wax separation temperature at which Wax is separated from the fuel. With this Construction is the start of operation for each of the different types of fuel can be set, deposit different temperature values of wax. According to the operation enabling device becomes the predetermined one Temperature value for each fuel close to the critical Temperature set at which wax from the fuel is deposited. In other words, the structure expanded the detectable area for serious dislocation caused by Foreign matter is caused. As a result, the Displacement detection accuracy can be increased. The one mentioned above predetermined temperature value can be very close to the critical Temperature, at what wax from the fuel is deposited, or higher than this critical temperature a tolerance of approximately 20 to 30 percent.

It is also preferable that the Operating release device is a bimetallic valve. In general it is Bimetallic valve is known to be low in failure and stable in operation is. The use of the bimetal valve enables the precise execution of the switching of the valve in the above mentioned predetermined temperature value without interference cause.

It is also preferable that the Displacement detection device and the operation release device with each other are formed in one piece. With this structure, the Dislocation detection device and the Operation release device can be integrated in a single unit. The Installation of this device is easily possible.

It is also preferred that an assembly of the Dislocation detection device and the Operating release device is arranged in one piece on the housing element. at With this structure, the displacement detection device can be reliably arranged beforehand on the filter device.

It is further preferred that an assembly of the Dislocation detection device and the Operating release device is arranged independently of the housing element. In in the event that there is insufficient space to arrange them Assembly on the cap of the filter device in the lateral direction or in the vertical direction, The above-mentioned construction enables easy Arrangement of the displacement detection device assembly and of the operation release device using one of an elastic member or the like Connecting pipe.

It is also preferable that the Dislocation detection device and the operation release device separately to be ordered. It is also preferable that the Operating release device arranged on the housing element becomes. With this structure, the housing element can be used to carry the operation release device. The The number of parts required can be reduced.

An object of the present invention is to provide one Diesel filter with a structure that is one-piece or separate use of a filter section with a Filter function and a water storage section with a Has water separation and water storage function, whereby Production costs are reduced and easy Arrangement without spatial restrictions is realized.

There is another aim of the present Invention in the creation of a diesel filter with a Element holding device, which a filter device partially trains in which a sealing element in a higher Position is arranged so that the filter device easily is removable without taking up a lot of friction, the is effective from the sealing element.

To the above mentioned task and others related to it The present invention demonstrates achieving goals Diesel filter on which is a shell to form a housing has, a cap member, which at an opening of the shell is arranged, a filter section in the shell is included and with a filter device for Filtering out foreign substances contained in the fuel a water storage section in the shell for Saving water is generated by the fuel is separated, the filter section and the Water storage section are generated as separate components.

It is too with the aforementioned diesel filter prefer that an opening of the filter section through a Cover element is closed when the water storage section is replaced by this cover element.

The diesel filter mentioned above is optional prefer an opening of the water storage section is closed by a cap element when the Filter section is replaced by this cap element.

With the structure described above, in the case that the diesel filter has no spatial restrictions exposed, the filter section and the Water storage section can be assembled in one piece to form one piece To train water reservoirs. On the other hand, if the The diesel filter is subject to spatial restrictions Filter section and the water storage section separately be arranged to form a separate water reservoir, without complicated modifications.

Furthermore, in the aforementioned diesel filter prefer that the filter device of this with respect the cover is removable and a sealing element only on one upper portion of the filter element is arranged.

With this structure, the replacement process is for the Filter element easily possible. Furthermore, the Durability of the sealing element against wear increased become.

It is an object of the present invention Diesel filter or a fuel filter of a filter device To create interchangeable version, which one Disconnecting device to prevent fuel in the State is fed into an internal combustion engine that no Filter device in the diesel filter or the Fuel filter is arranged, causing the failure of the Internal combustion engine is prevented.

To accomplish the above task and goal achieve, the present invention shows a fuel filter on, which has a shell to form a housing, a fuel supply channel for supplying fuel in the wrapper, a filter device that is in the wrapper is added to filter out foreign substances that are in the Fuel are included, and a fuel discharge channel to discharge pure fuel by the Is filtered, which are arranged to a filter device Filter device of the replacement version of the Training fuel filter. There is also a restraining device provided to prevent the supply of fuel if the filter element is not included in the envelope is. The prevention device has a valve and Push element open and the push element opens the valve, when the filter device is received in the envelope.

It is further preferred that the filter device of the cover is removable, the filter device Has mounting tube that serves as a fuel passage, and a filter element for filtering fuel, and that Pushing element is a front end of the fastening tube.

It is further preferred that the filter device of the cover is removable, the filter device Has mounting tube that serves as a fuel passage, and a filter element for filtering fuel, and that Pushing element at a front end of the fastening tube is generated.

It is further preferred that the filter device of the cover is removable, the filter device Has mounting tube that serves as a fuel passage, and a filter element for filtering fuel, and that Pushing element on an outer surface of the fastening tube is generated.

It is also preferable that the filter device is a Filter element for filtering the fuel and a holding element for holding the filter element and the pressing element is generated on the holding element.

Furthermore, the present invention shows a diesel filter on, with a covering to form a housing, a fuel supply channel for supplying fuel into the Casing, a hand pump, a first check valve, which is arranged on an inflow side of the hand pump, a second check valve, which is located on an outflow side of the Hand pump is arranged, a filter device that in the casing is arranged for filtering foreign substances, contained in the fuel and one Fuel discharge channel for discharging pure fuel through the filter device is filtered, which is arranged in this way are a diesel filter the Training filter device replacement design. Furthermore, the second is Check valve arranged in the filter device.

The structure described above reliably prevents that unfiltered fuel in the case in the Internal combustion engine is supplied that the filter device as a result Negligence during the replacement process or yourself if the filter device is accidentally removed from the Diesel filter or the fuel filter is removed, not in the Diesel filter or the fuel filter is arranged. The Interlocking device can be done by a simple valve will be realized. The costs will only increase slightly. Furthermore, the structure described above is on conventional diesel or fuel filters can be used without extensive modifications to the structure are required.

In particular, the diesel filter described above can be easily realized by the Position of the second check valve opposite one conventional position of the filter device is changed.

BRIEF DESCRIPTION OF THE DRAWINGS

The task and other goals, characteristics, points of view and Advantages of the present invention will become apparent from the following detailed description of the invention in connection with the attached drawings clearly.

Fig. 1 is a cross-sectional view showing a diesel filter according to a first embodiment of the present invention,

Fig. 2 is an enlarged cross-sectional view showing a displacement detection sensor according to the first embodiment of the present invention,

Fig. 3 shows a graph illustrating the change in pressure which is caused by displacement of a diesel filter, with respect to a route,

FIG. 4 shows a cross-sectional view to show a modified embodiment of FIG. 2 or FIG. 5,

Fig. 5 is an enlarged cross-sectional view of another displacement detecting sensor according to a second embodiment of the present invention,

Fig. 6 is a cross-sectional view of another diesel filter according to a third embodiment of the present invention,

Fig. 7 is an enlarged cross-sectional view of another displacement detecting sensor according to the third embodiment of the present invention,

Fig. 8 shows a cross-sectional view schematically showing a modification of Fig. 7,

Fig. 9 is a cross-sectional view schematically showing another modification shown in FIG. 7,

Fig. 10 is a diagram schematically showing a fuel supply system having the displacement detection sensor according to a fourth embodiment of the present invention,

Fig. 11 is a diagram schematically illustrating shows a conventional fuel supply system for a diesel internal combustion engine,

Fig. 12 is a cross-sectional view showing a diesel filter having a one-piece water tank according to a fifth embodiment of the present invention,

Fig. 13 shows a cross-sectional view showing a Vormontagezustands of the constituent components of the diesel filter with a one-piece water tank according to the fifth embodiment of the present invention,

Fig. 14 is a cross-sectional view showing a filter portion of a diesel filter with a separate water tank according to a sixth embodiment of the present invention,

Fig. 15 is a cross-sectional view showing a water storage portion of the diesel filter, with separate water tank according to the sixth embodiment of the present invention,

Fig. 16 is a view showing a conventional fuel supply system, comprising a diesel filter having a one-piece water reservoir,

Fig. 17 shows a cross-sectional view of a conventional diesel filter with a one-piece water reservoir,

Fig. 18 shows a view of a conventional fuel supply system having a fuel filter with a separate water reservoir,

Fig. 19 is a cross-sectional view showing an overall structure of a fuel filter of the filter device-Auswechselausführung according to a seventh embodiment of the present invention,

Fig. 20 is a partial cross-sectional view 19 shows the Fig. Showing an installation failure sensing valve in the state that the filter device is not disposed,

FIG. 21 is a partial cross sectional view of FIG. 19 showing the installation failure detection valve in the state that the filter device is arranged;

FIG. 22A shows a cross sectional view, and FIG. 22B shows a bottom view of FIG. 22A, showing a valve seat portion in connection, when the installation failure detection valve is arranged in FIG. 19,

FIG. 23A shows a cross sectional view, and FIG. 23B shows a bottom view of FIG. 23A, showing the installation in conjunction failure detection valve of Fig. 19,

Fig. 24 is a partial cross sectional view of Fig. 19 showing another kind of the installation failure detection valve according to an eighth embodiment of the present invention in the state that the filter device is not arranged,

Fig. 25 is a partial cross-sectional view showing the Fig. 19 illustrating the other embodiment of the installation failure detecting valve shown above, according to the eighth embodiment of the present invention in the state that the filter device is arranged,

Fig. 26A is a plan view of Figs. 24 and 25 showing a push member used to open the installation failure detection valve, Fig. 26B is a plan view showing a modified embodiment of the push member, and Fig. 26C is a plan view showing another modified embodiment of the pressing element,

FIG. 27 is a partial cross sectional view of FIG. 19 showing another embodiment of the installation failure detection valve according to a ninth embodiment of the present invention in the state that the filter device is arranged;

Fig. 28 shows a cross-sectional view showing an overall configuration of another fuel filter of the filter device-Auswechselausführung according to a tenth embodiment of the present invention,

Fig. 29 shows a cross-sectional view showing an overall configuration of another fuel filter of the filter device-Auswechselausführung according to an eleventh embodiment of the present invention,

Fig. 30 is a schematic view showing a conventional fuel supply system for a diesel internal combustion engine, and

Fig. 31 is a cross-sectional view showing a conventional diesel filter of the filter device-Auswechselausführung.

DESCRIPTION OF THE PREFERRED EMBODIMENTS fuel supply First embodiment

Fig. 1 shows a cross-sectional view of a diesel filter and a displacement detection sensor which is arranged on a cap of the diesel filter. Fig. 2 shows an enlarged cross-sectional view of the arrangement of the displacement detection sensor.

The diesel filter 10 has a housing element with a cylindrical envelope 11 with a closed bottom, which defines an outer wall of the diesel filter 10 , and a cap 12 , which is removably arranged at an upper open end of the envelope 11 . The cap 12 is a member made of resin, on which a fuel supply pipe fixing portion 12 d and a fuel discharge pipe fixing portion (not shown) are formed. A fuel supply pipe 13 with a pack 13 a, which is arranged at the end thereof, is integrally connected to the fuel supply pipe fastening section 12 d. Similarly, a fuel discharge pipe (not shown) is connected to the fuel discharge pipe attachment portion.

Further, when the fuel supply pipe 13 is arranged on the fuel supply pipe fixing portion 12 d, a first check valve 12 f is arranged between them. A second check valve 12 g is arranged above an inlet opening 12 b, which supplies the fuel to a filter device 16 described further below. The first check valve 12 f and the second check valve 12 g have the same function to enable the fuel to flow from the fuel supply pipe 13 in one direction to the filter device 16 and to prevent the flow of the fuel in the opposite direction to the to ensure undisturbed operation of a hand pump 15 .

The hand pump 15 and a displacement detection sensor 40 are arranged on the cap 12 , which defines a part of the housing element. The hand pump 15 has a hollow pump casing 15 a, which defines a housing, and a cap portion 15 d. A plunger 15 b, which is elastically pushed upwards by a spring 15 c, is arranged in the interior of the hand pump 15 . The cap portion 15 d is provided with an opening (not shown). When pressed against an elastic force of the spring 15 c and rotated at a predetermined angle, a flange 15 e, which is arranged at an upper circumferential end of the plunger 15 b, comes into operative relationship with the active surface of the cap section 15 d. The plunger 15 b is kept in a lowered state. If the plunger 15 b is rotated at a predetermined angle in the opposite direction while it is pressed down, the plunger 15 b can move up and jump out when released. By reciprocally moving the plunger 15 b in this state, the air and fuel compressed under the plunger 15 b are compressed. The air and the fuel compressed in this way by the hand pump 15 are pushed out to the fuel discharge pipe (not shown) by the function of the first check valve 12 f and the second check valve 12 g. The hand pump 15 is used immediately after the filter device 16 is replaced or when water has to be removed from the diesel filter 10 .

The envelope 11 is a resin-made cylindrical member with a closed bottom and an open top. A thread 22 is generated on an outer peripheral portion of an upper end portion 11 a of the sheath 11 . With regard to the connection between the casing 11 and the cap 12 , the filter device 16 is first accommodated in the casing 11 . Then the cap 12 is connected to the upper end portion 11 a of the envelope 11 in the state that a package 21 is arranged at the lower end portion 12 a of the cap 12 . Then a fastener 23 comes into engagement with the thread 22 , which is produced and tightened on the cylindrical outer portion of the upper end 11 a of the casing 11 in order to hermetically connect it. When the filter device 16 is replaced, the above-mentioned elements are disassembled in the reverse order.

The filter device 16 has a fuel passage 18 disposed in the center thereof to serve as a core, a filter element 17 made of coaxial papers or the like wrapped around the outer cylindrical surface of the fuel passage 18 , an upper end plate 19 which is provided with an outlet opening and a lower end plate 20 which is provided with an inlet opening. The fuel passage 18 as well as projecting from the upper end to the lower end, has an upper protruding portion 18 a and a lower protruding portion 18 b on. Furthermore, the height of the filter device 16 is approximately half the height of the casing 11 .

The inner surface of the envelope 11 is formed with numerous ribs 26 which are equally spaced apart and extend within the lower half height to position the filter device 16 . When disposed in the enclosure 11 , the lower end plate 20 of the filter device 16 is brought into contact with the ribs 26 and positioned there. The lower end portion 12 a of the cap 12 is brought into contact with the upper end plate 19 of the filter device 16 . In the state that the filter device 16 is arranged in the casing 11 , the filter device 16 is arranged between the ribs 26 and the lower end portion 12 a of the cap 12 . Furthermore, in the state that the filter device 16 is accommodated in the casing 11 , an upper space 25 is provided above the filter device 16 , while a lower space 27 is provided below the filter device 16 .

A ring member 24 having the inlet port 12 b at the upper portion, extending from the center of the lower surface of the cap 12 downward. After the filter device 16 is received in the casing 11 , the cap 12 is tightened. In this state, the upper projection portion 18 is hermetically connected to a fuel channel 18 with the ring member 24th The entire fuel, which is introduced from the fuel supply pipe 13 via the inlet opening 12 b into the ring element 24 , flows via the fuel channel 18 into the lower space 27 .

The fuel which is introduced into the lower space 27 mixes in a turbulent flow which is obtained in this space. The water separates from the fuel and settles as separated water at the bottom of the lower space 27 . After the water has been separated off, the fuel changes the direction of flow and enters the filter element 17 from the lower end plate 20 of the filter device 16 . The filter element 17 filters the fuel to remove the contaminants. After separating the contaminants, the fuel is pushed from the upper end plate 19 to the upper space 25 and then discharged from the fuel discharge pipe (not shown) which is arranged on the upper surface of the cap 12 .

A level switch 28 is arranged in the lower room 27 . The level switch 28 is a float version which has a hollow rod element 29 and a float 30 . The hollow rod member 29 is a thin, longitudinally extending member with an opening at its lower end. A screen a stop 29 is arranged on the upper part of the hollow rod member 29th A switch section 32 and a feed line 33 are connected to one another and are arranged in the cavity of the rod element 29 .

The float 30 is a hollow member made of resin with an opening in the middle. A ring magnet 31 is arranged at its lower opening. The float 30 is slidable in the up and down direction along the rod member 29 . The vertical position of the float 30 depends on the amount of water that is stored in the lower space 27 . When the float 30 comes into contact with the screen stop 29 a, the volume of the stored water reaches a dangerous level. That is, the amount of the separated water stored in the lower space 27 increases, and the float 30 comes into contact with the screen stopper 29 a. At this moment, the magnet 31 , which is arranged on the float 30 , pulls a movable contact of the switch section 32 to the fixed contact thereof. The movable contact is brought into contact with the fixed contact. The warning lamp, which is located near the driver's seat, is switched on.

After confirmation of the activation of the warning lamp, the driver opens a drain cock (not shown) which is arranged on the bottom of the casing 11 in order to drain the separated water from the lower space 27 . In this case, it is possible to use the hand pump 15 .

The displacement detection sensor 40 serving as the displacement detection device of the present invention will be explained with reference to FIG. 2. The displacement detection sensor 40 is arranged in the upper part of the cap 12 . The displacement detecting sensor 40 communicates with the above-described upper space 25 of the diesel filter 10 in combination, in which the filtered fuel flows after it has passed through the filter device 16, which separates foreign substances from the fuel.

The displacement detection sensor 40 has three components made of resin, that is, an upper member 41 , a middle member 42, and a lower member 43 . The displacement detection sensor 40 further includes an outer member 53 made of resin that surrounds the three components made of resin. The upper element 41 has a hollow portion 41 b in its lower portion. Contacts described below are arranged in the hollow portion 41 b. A step portion 41 c is generated on a cylindrical outer portion of the upper member 41 .

The middle element 42 is a disc element with a cylindrical bore 42 a in the middle. A fixed contact 49 is arranged on the upper surface of the middle element 42 . A column-shaped element 46 described further below is inserted into the central cylindrical bore 42 a of the central element 42 . The columnar member 46 is slidable in the up and down direction.

Furthermore, the lower element 43 is an element with an H-shaped cross section. A vacuum inlet channel 43 a is generated in the middle of the lower element 43 . An O-ring 43 e is connected in a groove 43 b, which is generated in the outer cylindrical surface of the lower element 43 . The groove 43 b is arranged in the middle height of the lower element 43 . The upper portion of the lower element 43 is formed into a cylindrical clamping piece 43 c, which stands upright and is connected to the step portion 41 c of the upper element 41 described above. The lower portion of the lower member 43 is formed into a cylindrical body 43 d that extends downward.

The above-described three elements, the upper element 41 , the middle element 42 and the lower element 43 , are arranged in succession as shown in the drawing. These three elements are integrally formed by engagement of the cylindrical clamping piece 43 c, which stands as the upper part of the lower element 43 with the step portion 41 c of the above-described upper element 41 . Furthermore, the following elements are also included in the assembly processes of the three elements described above.

First, in the process of assembling the upper member 41 with the middle member 42, a movable contact 47 and a fixed contact 49 are placed in the cavity 41b defined between the upper member 41 and the middle member 42 . More specifically, the fixed contact 49 is disposed on the top surface of the middle member 42 . The movable contact 47 is arranged above the fixed contact 49 in such a way that they are arranged opposite one another. A support rod 47 a, which carries the movable contact 47 , has an opposite end portion which is connected to the other end of a connection terminal 48 . The connection terminal 48 extends over the upper element 41 and protrudes upward into a cylindrical portion 53 a with a small diameter of the outer element 53 described below. The columnar member 46 , which is slidably arranged in the upward and downward direction, is in contact with the center of the support rod 47 to move the movable contact 47 in the upward and downward direction.

Thereupon, in the process for assembling the middle element 42 with the lower element 43, a membrane 44 , a receiving element 50 for supporting a spring 52 and a seat element 51 for supporting the other end of the spring 52 are accommodated in the vacuum introduction channel 43 a, which is defined between the middle element 42 and the lower element 43 . More specifically, an annular bearing member 45 is integrally formed along the outer periphery of the membrane 44 . The bearing member 45 is disposed between an edge lower end portion of the middle member 42 and an edge upper end portion of the lower member 43 . In this structure, the membrane 44 is mounted so that it is movable in the upward and downward direction in the negative pressure introduction channel 43 a.

Furthermore, the lower end of the above-described columnar member 46 is integrally fixed in the middle of the upper surface of the membrane 44 . According to the upward and downward movement of the diaphragm 44, the column-shaped member 46 and the supporting rod 47 move together in a upward and downward direction. As a result, the movable contact 47 and the fixed contact 49 cooperatively realize the on and off operation.

Further, the receiving member 50 is disposed in the negative pressure introduction passage 43 described above so as to be slidable in the upward and downward directions. The receiving member 50 is a lightweight member made of resin with an H-shaped cross section. An opening 50 a is created in the middle of the receiving element 50 . The upper surface of the receiving element 50 is brought into contact with the lower surface of the membrane 44 . The lower surface of the receiving element 50 supports the upper end of the spring 52 . The seat member 51 with an opening 51 a in the middle, is screwed into the lower end part of the vacuum inlet channel 43 a thread. The seat element 51 supports the lower end of the spring 52 . The spring 52 which is disposed between the seat member 51 and the receiving member 50, urging the receiving member 50 elastically upwards. As a result, the membrane 44 moves upward and comes into contact with the lower surface of the middle member 42 . The columnar member 46 , which is integrally formed with the membrane 44 , moves upward. The support rod 47 a also moves upwards. The movable contact 47 separates from the fixed contact 49 and remains in a release position. The displacement detection sensor 40 is in an inactive state if no negative pressure is introduced into the negative pressure introduction channel 43 a, since the movable contact 47 and the fixed contact 49 are maintained in the OFF state. That is, the switch of the displacement detection sensor 40 is opened in the normal state and is closed when the displacement occurs.

The three elements, the upper element 41 , the middle element 42 and the lower element 43 are assembled as described above. After assembly, these elements are surrounded by the outer element 53 . The outer element 53 has an opening in its lower part. The small-diameter cylindrical portion 53 a, which serves as a connector, is formed on the upper part of the outer member 53 . In other words, the outer member 53 is formed in a cylindrical shape having portions of different diameters. In the state that the outer member 53 is connected to the three members described above, they are hermetically sealed with the above-described O-ring 43 e, which has a function of preventing fuel leakage.

The displacement detection sensor 40 mounted in this way is arranged in the following manner. That is, an attachment hole 12 j is provided in the upper surface of the cap 12 of the diesel filter 10 . A cylindrical flange 12 h is produced along the fastening opening 12 j so that a large contact area is provided for the displacement detection sensor 40 . The lower end of the outer member 53 of the displacement detection sensor 40 is inserted into the mounting hole 12 j. The outer member 53 and the displacement detection sensor 40 are connected at their contact portion by thermal welding or the like.

The pressure change on the downstream side of the diesel filter 10 , which occurs according to the displacement of the diesel filter 10 , is explained in a simple manner with reference to FIG. 3. The diesel filter 10 is a resistance element for the fuel flowing through. Even in a non-offset state, a significant negative pressure occurs on the downstream side of the diesel filter 10 . As shown in Fig. 3, the pressure difference in the initial state (ie in the non-offset state) is approximately -10 kPa. The degree of displacement of the diesel filter 10 increases in proportion to the travel distance, which reflects the use of this filter. The negative pressure on the outflow side of the diesel filter 10 increases in accordance with the degree of dislocation. Finally, the air layer is formed in the fuel. The fuel is clouded. When the fuel is cloudy, a sliding surface of the injection pump is deficient in oil. This can lead to seizure. The fuel supply is interrupted. The internal combustion engine accordingly stops. Such an engine malfunction caused by the clouded fuel is believed to occur when the pressure difference reaches the level of approximately -50 kPa. It goes without saying that the diesel filter 10 must be replaced before the pressure difference reaches this critical point (limit turbidity level).

The function is explained below. The upper space 25 of the diesel filter 10 is connected to the negative pressure inlet duct 43 a via the opening 51 . The upper space 25 is arranged on the downstream side of the element 17 . As shown in FIG. 3, the negative pressure of the upper space 25 increases according to the displacement amount of the filter element 17 . The increased negative pressure is introduced into the negative pressure introduction channel 43 a of the displacement detection sensor 40 . The negative pressure acts on the membrane 44 . The membrane 44 moves down. The columnar element 46 and the support rod 47 a, which are connected to the membrane 44 , move together with the membrane 44 down. The movable contact 47 is brought into contact with the fixed contact 49 . As a result, the indicator lamp located near the driver's seat is turned on to inform the driver to move the filter device 16 . At this moment, the detection pressure of the displacement detection sensor 40 is set to the predetermined range, which is greater than an initial pressure, ie, about -10 kPa, which is measurable when no displacement has occurred, and less than a displacement pressure, e.g. B. about -50 kPa, at which the clouding of the fuel begins and disturbances of the internal combustion engine are caused, which is measurable if no fuel is supplied as a result of the displacement.

According to the in Fig. 1 and 2 shown embodiment, the displacement detection sensor is arranged in one piece on the cap 12. 40, which serves as a housing element of the displacement detection sensor 40. However, as shown in FIG. 4, it is possible to dispose the displacement detection sensor 40 separately or independently with respect to the cap 12 .

According to the embodiment shown in FIG. 4, a connecting pipe 61 is arranged on the lower part of the displacement detection sensor 40 . The connecting tube 61 is connected to a flange 12 h, which is arranged on the cap 12 , with a connecting tube 62 , which is made of a rubber or a comparable elastic material. With this structure, the installation of the displacement detection sensor 40 is easy even if the hand pump 15 or other elements are disposed on the top of the cap 12 .

Second embodiment

Fig. 5 shows an enlarged cross-sectional view of a displacement detection sensor which is arranged on the cap of the diesel filter according to a second embodiment of the present invention. The diesel filter 10 of this embodiment is the same as that shown in FIGS. 1 and 2, and therefore the diesel filter 10 will not be explained below.

The displacement detection sensor 40 of the second embodiment is explained below with reference to FIG. 5. The displacement detection sensor 40 is arranged on the upper part of the cap 12 . The displacement detecting sensor 40 communicates with the above-described upper space 25 of the diesel filter 10 in combination, in which the purified fuel after passing through the filter device 16 flows, which separates foreign substances from the fuel.

The displacement detection sensor 40 has three components made of resin, that is, an upper member 41 , a middle member 42, and a lower member 43 . The displacement detection sensor 40 further includes an outer member 53 made of resin that surrounds the three components made of resin. The upper element 41 has a hollow portion 41 b in its lower portion. Contacts described below are arranged in the hollow portion 41 b. A step portion 41 c is generated on an outer cylindrical portion of the upper member 41 .

The middle element 42 is a disc element with a cylindrical bore 42 a in the middle. A fixed contact 49 is arranged on the upper surface of the middle element 42 . A column-shaped element 46 described further below is inserted into the central cylindrical bore 42 a of the central element 42 . The columnar member 46 is slidable in the up and down direction.

Furthermore, the lower element 43 is an element with an H-shaped cross section. A vacuum inlet channel 43 a is generated in the middle of the lower element 43 . An O-ring 43 e is connected in a groove 43 b, which is generated in the outer cylindrical surface of the lower element 43 . The groove 43 b is arranged in the middle height of the lower element 43 . The upper portion of the lower element 43 is formed into a cylindrical clamping piece 43 c, which stands upright and is connected to the step portion 41 c of the upper element 41 described above. The lower portion of the lower member 43 is formed into a cylindrical body 43 d that extends downward. The cylindrical body 43 d has a lower end surface, f on which protruding portions 43 and recess portions are produced alternately g 43rd The lower element 43 and a valve support element 55 described further below jointly define an inner chamber 56 which is arranged under the lower element 43 .

The above-described three elements, the upper element 41 , the middle element 42 and the lower element 43 , are arranged in succession as shown in the drawing. These three elements are integrally formed by engagement of the cylindrical clamping piece 43 c, which stands as the upper part of the lower element 43 with the step portion 41 c of the above-described upper element 41 . Furthermore, the following elements are also included in the assembly processes of the three elements described above.

First, in the assembly process, the upper member 41 with the middle member 42, a movable contact 47 and a fixed contact 49 are placed in the cavity 41b , which is defined between the upper member 41 and the middle member 42 . More specifically, the fixed contact 49 is disposed on the top surface of the middle member 42 . The movable contact 47 is disposed above the fixed contact 49 so that they are opposed to each other. A support rod 47 a, which carries the movable contact 47 , has an opposite end portion which is connected to the other end of a connection terminal 48 . The connection terminal 48 extends over the upper element 41 and protrudes upward into a cylindrical portion 53 a with a small diameter of the outer element 53 described below. The column-shaped member 46 which is slidably disposed in the up and down direction to move to the center of the support bar 47 a in contact to the movable contact 47 in the up and down direction.

Thereupon, in the process for assembling the middle element 42 with the lower element 43, a membrane 44 , a receiving element 50 for supporting a spring 52 and a seat element 51 for supporting the other end of the spring 52 are accommodated in the vacuum introduction channel 43 a, which is defined between the middle element 42 and the lower element 43 . More specifically, an annular bearing member 45 is integrally formed along the outer periphery of the membrane 44 . The bearing member 45 is disposed between an edge lower end portion of the middle member 42 and an edge upper end portion of the lower member 43 . In this structure, the membrane 44 is mounted so that it is movable in the upward and downward direction in the negative pressure introduction channel 43 a.

Furthermore, the lower end of the above-described columnar member 46 is integrally fixed in the middle of the upper surface of the membrane 44 . According to the upward and downward movement of the diaphragm 44, the column-shaped member 46 and the supporting rod 47 move together in a upward and downward direction. As a result, the movable contact 47 and the fixed contact 49 cooperatively realize the on and off operation.

Further, the receiving member 50 is disposed in the negative pressure introduction passage 43 described above so as to be slidable in the upward and downward directions. The receiving member 50 is a lightweight member made of resin with an H-shaped cross section. An opening 50 a is created in the middle of the receiving element 50 . The upper surface of the receiving element 50 is brought into contact with the lower surface of the membrane 44 . The lower surface of the receiving element 50 supports the upper end of the spring 52 . The seat member 51 with an opening 51 a in the middle, is screwed into the lower end part of the vacuum inlet channel 43 a thread. The seat element 51 supports the lower end of the spring 52 . The spring 52 which is disposed between the seat member 51 and the receiving member 50, urging the receiving member 50 elastically upwards. As a result, the membrane 44 moves upward and comes into contact with the lower surface of the middle member 42 . The columnar member 46 , which is integrally formed with the membrane 44 , moves upward. The support rod 47 a also moves upwards. The movable contact 47 separates from the fixed contact 49 and remains in a release position. The displacement detection sensor 40 is in an inactive state if no negative pressure is introduced into the negative pressure introduction channel 43 a, since the movable contact 47 and the fixed contact 49 are maintained in the OFF state. That is, like that described in the first embodiment, the switch of the displacement detection sensor 40 is opened in the normal state and is closed when the displacement occurs.

The three elements, the upper element 41 , the middle element 42 and the lower element 43 , are assembled as described above. After assembly, these elements are surrounded by the outer element 53 . The outer element 53 has an opening in its lower part. The small-diameter cylindrical portion 53 a, which serves as a connector, is formed on the upper part of the outer member 53 . In other words, the outer member 53 is formed in a cylindrical shape having portions of different diameters. In the state that the outer member 53 is connected to the three members described above, they are hermetically sealed with the above-described O-ring 43 e, which has a function of preventing fuel leakage.

After the three members, the upper member 41 , the middle member 42 and the lower member 43 are surrounded by the outer member 53 , a bimetal valve 54 and a valve support member 55 are connected from the lower opening of the outer member 53 . The bimetallic valve 54 , which corresponds to the operation release device of the present invention, is a disk member having a diameter smaller than an inner diameter of the outer member 53 . The bimetallic valve 54 moves in the upward and downward direction with the outer peripheral end thereof being reliably fixed.

The valve support member 55 has a connection opening 55 a, which is arranged in the middle. The fuel flows into the connection opening 55 a and the negative pressure acts on the connection opening 55 a. A valve seat 55 b, which is formed into a ring back, is generated around the upper opening of the connection opening 55 a. A plurality of inclined ribs 55 c, which extend in radial directions, is arranged on the bottom thereof. The highest outer end side of each inclined rib 55 c is formed into a flat portion 55 d.

The bimetal valve 54 described above is arranged in the following manner. The displacement detection sensor 40 is reversed. The bimetallic valve 54 is inserted into the opening of the displacement detection sensor 40 . The outer peripheral end of the bimetallic valve 54 is mounted on the protruding portions 43 f that are formed on the lower end surface of the cylindrical body 43 d. Then the valve support member 55 described above is connected from above. The opposite outer peripheral end of the bimetallic valve 54 is brought into contact with the flat portion 55 d, which is generated at the outer end of the inclined rib 55 c of the support member 55 . In this state, the outer member 53 and the valve support member 55 are integrally connected by thermal welding. As a result, the outer peripheral end of the bimetallic valve 54 is disposed between the protruding portions 43 f generated on the lower end surface of the cylindrical body 43 d and the flat portion 55 d generated on the outer end of the inclined rib 55 c. A clearance between the recess portion 43 g, which is generated at the lower end of the cylindrical body 43 d and the bottom of the valve support member 55 , forms a connecting channel 57 to allow the fuel or the negative pressure to pass through.

The bimetallic valve 54 shifts in the upward and downward direction at the center thereof, with the outer peripheral end being reliably fixed. The lower side of the bimetallic valve 54 can be brought into contact with the valve seat 55 b, which is generated on the upper surface of the valve support element 55 . When the bimetallic valve 54 is brought into contact with the valve seat 55 b, the connection between the connection opening 55 a and the inner chamber 56 is interrupted. On the other hand, the state that the bimetallic valve 54 is released from the valve seat 55 b that the fuel or the negative pressure enters the inner chamber 56 through the connection opening 55 a.

The displacement detection sensor 40 united in this way is arranged in the following manner. That is, an attachment hole 12 j is provided in the upper surface of the cap 12 of the diesel filter 10 . A cylindrical flange 12 h is produced along the fastening opening 12 j so that a large contact area is provided for the displacement detection sensor 40 . The lower end of the outer member 53 of the displacement detection sensor 40 is inserted into the mounting hole 12 j. The outer member 53 and the displacement detection sensor 40 are connected at their contact portion by thermal welding or the like.

As described above, mounting the bimetallic valve 54 on the lower portion of the displacement detection sensor 40 as a one-piece unit is advantageous for handling it and also enables the installation to be facilitated and simplified, whereby the cost can be reduced accordingly.

The functions are explained below. When the temperature of the fuel flowing into the filter device 16 is higher than a critical value at which the fuel initiates the deposition of wax, the bimetallic valve 54 moves up and detaches from the valve seat 55 b that is on the upper one Surface of the valve support member 55 described above is generated. Thus, the upper space 25 of the diesel filter 10 is connected to the inner chamber 56 via the connection opening 55 a.

If the filter element 17 of the filter device 16 moves in this state, the negative pressure of the upper space 25 increases , since this is arranged on the downstream side of the filter element 17 . The increased negative pressure is transmitted via the aforementioned connection opening 55 a to the inner chamber 56 of the displacement detection sensor 40 . And then the negative pressure acts on the membrane 44 from the inner chamber 56 via the negative pressure inlet channel 43 a. The membrane 44 moves down. The columnar element 46 and the support rod 47 a, which are connected to the membrane 44 , move together with the membrane 44 down. The movable contact 47 is brought into contact with the fixed contact 49 . As a result, the indicator lamp located near the driver's seat is turned on to inform the driver to move the filter device 16 .

However, when the temperature of the fuel flowing into the filter device 16 is lower than the critical value at which the fuel starts to deposit wax, the bimetallic valve 54 moves down and comes into contact with the valve seat 55 b. As a result, the connection between the connection opening 55 a and the inner chamber 56 is interrupted. The filter element 17 is temporarily displaced due to the deposition of wax from the fuel. Even if the negative pressure of the upper chamber 25 increases, the bimetallic valve 54 remains in contact with the valve seat 55 b. Thus, the increased negative pressure does not affect the membrane 44 of the displacement detection sensor 40 . The movable contact 47 and the fixed contact 49 are maintained in the open state. The indicator lamp, which is located near the driver's seat, is not switched on.

As in the embodiment described above, it is possible to dispose the combined assembly of the displacement detection sensor 40 and the bimetal valve 54 separately from the cap 12 , as shown in FIG. 4.

Third embodiment

FIGS. 6 and 7 show a displacement detection sensor according to a third embodiment of the present invention. FIG. 6 shows a cross-sectional view of the displacement detection sensor which is arranged on a cap of a diesel filter according to the invention. FIG. 7 shows an enlarged cross-sectional view of the displacement detection sensor shown in FIG. 6.

The third embodiment is characterized in that the displacement detection sensor 40 is arranged directly on the cap 12 of the diesel filter 10 . In other words, the displacement detection sensor 40 and the bimetallic valve 54 are separate components. According to the third embodiment, the above-described outer member 53 and the valve support member 55 , which form part of the displacement detection sensor 40 , are omitted. Instead, the function of these omitted elements is performed by the cap 12 . The diesel filter 10 of this embodiment is substantially the same as that shown with reference to FIGS. 1 and 2, and therefore no explanation will be given for the diesel filter 10 below.

As in the first and second embodiments, the displacement detection sensor 40 has three components made of resin, that is, an upper member 41 , a middle member 42, and a lower member 43 . A cylindrical connecting portion 41 a is integrally formed as an upper part of the upper element 41 . The upper member 41 has a hollow portion 41 b in the lower portion thereof. Contacts further described below are arranged in the hollow section 41 b. A step portion 41 c is generated on an outer cylindrical portion of the upper member 41 .

The middle element 42 is a disc element with a cylindrical bore 42 a in the middle. A fixed contact 49 is arranged on the upper surface of the middle element 42 . A column-shaped element 46 described further below is inserted into the central cylindrical bore 42 a of the central element 42 . The columnar member 46 is slidable in the up and down direction.

Furthermore, the lower element 43 is an element with an H-shaped cross section. A vacuum inlet channel 43 a is generated in the middle of the lower element 43 . An O-ring 43 e is connected in a groove 43 b, which is generated in the outer cylindrical surface of the lower element 43 . The groove 43 b is arranged in the middle height of the lower element 43 . The upper portion of the lower element 43 is formed into a cylindrical clamping piece 43 c, which stands upright and is connected to the step portion 41 c of the upper element 41 described above. The lower portion of the lower member 43 is formed into a cylindrical body 43 d that extends downward. The cylindrical body 43 d has a lower end surface, f on which protruding portions 43 and recess portions are produced alternately g 43rd The lower element 43 and the bottom of a depression section 60 , described further below, together define an inner chamber 56 which is arranged below the lower element 43 .

The above-described three elements, the upper element 41 , the middle element 42 and the lower element 43 , are arranged in succession as shown in the drawing. These three elements are integrally formed by engagement of the cylindrical clamping piece 43 c, which stands as the upper part of the lower element 43 with the step portion 41 c of the above-described upper element 41 . Furthermore, the following elements are also included in the assembly processes of the three elements described above.

First, in the assembly process, the upper member 41 with the middle member 42, a movable contact 47 and a fixed contact 49 are placed in the cavity 41b , which is defined between the upper member 41 and the middle member 42 . More specifically, the fixed contact 49 is disposed on the top surface of the middle member 42 . The movable contact 47 is disposed above the fixed contact 49 so that they are opposed to each other. A support rod 47 a, which carries the movable contact 47 , has an opposite end portion which is connected to the other end of a connection terminal 48 . The connection terminal 48 extends over the upper element 41 in the cylindrical connecting portion 41 a. The columnar member 46 , which is slidably arranged in the upward and downward direction, is in contact with the center of the support rod 47 to move the movable contact 47 in the upward and downward direction.

Thereupon, in the process for assembling the middle element 42 with the lower element 43, a membrane 44 , a receiving element 50 for supporting a spring 52 and a seat element 51 for supporting the other end of the spring 52 are accommodated in the vacuum introduction channel 43 a, which is defined between the middle element 42 and the lower element 43 . More specifically, an annular bearing member 45 is integrally formed along the outer periphery of the membrane 44 . The bearing member 45 is disposed between an edge lower end portion of the middle member 42 and an edge upper end portion of the lower member 43 . In this structure, the membrane 44 is mounted so that it is movable in the upward and downward direction in the negative pressure introduction channel 43 a.

Furthermore, the lower end of the above-described columnar member 46 is integrally fixed in the middle of the upper surface of the membrane 44 . According to the upward and downward movement of the diaphragm 44, the column-shaped member 46 and the supporting rod 47 move together in a upward and downward direction. As a result, the movable contact 47 and the fixed contact 49 cooperatively realize the on and off operation.

Further, the receiving member 50 is disposed in the negative pressure introduction passage 43 described above so as to be slidable in the upward and downward directions. The receiving member 50 is a lightweight member made of resin with an H-shaped cross section. An opening 50 a is created in the middle of the receiving element 50 . The upper surface of the receiving element 50 is brought into contact with the lower surface of the membrane 44 . The lower surface of the receiving element 50 supports the upper end of the spring 52 . The seat element 51 with an opening 51 a in the middle, is screwed into the lower end part of the vacuum inlet channel 43 a thread. The seat element 51 supports the lower end of the spring 52 . The spring 52 which is disposed between the seat member 51 and the receiving member 50, urging the receiving member 50 elastically upwards. As a result, the membrane 44 moves upward and comes into contact with the lower surface of the middle member 42 . The columnar member 46 , which is integrally formed with the membrane 44 , moves upward. The support rod 47 a also moves upwards. The movable contact 47 separates from the fixed contact 49 and remains in an open position. The displacement detection sensor 40 is in an inactive state if no negative pressure is introduced into the negative pressure introduction channel 43 a, since the movable contact 47 and the fixed contact 49 are maintained in the OFF state. That is, like the one described in the first embodiment, the switch of the displacement detection sensor 40 is opened in the normal state and is closed when the displacement occurs.

The three elements, the upper element 41 , the middle element 42 and the lower element 43 , are assembled as described above. After assembly, these elements are connected to the recess portion 60 which is arranged to retract downward from the upper part of the cap 12 . The recess portion 60 is cup-shaped, consisting of a cylindrical wall 60 a and a lower wall 60 b. The cylindrical wall 60 a has an inner diameter that is slightly larger than the outer diameter of the middle element 42 described above. The lower wall 60 b has a connection opening 55 a, which is provided in the middle. The fuel flows into the connection opening 55 a, and the negative pressure acts on the connection opening 55 a. A valve seat 55 b, which is designed as an annular back, is generated around the upper opening of the connection opening 55 a. A plurality of inclined ribs 55 c extending in radial directions are provided on the bottom thereof. The highest outer end side of each inclined rib 55 c is generated as a flat portion 55 d. In the state that the above-mentioned three members are disposed in the recess portion 60 , they are hermetically sealed with the above-described O-ring 43 e, which has a function of preventing the leakage of fuel.

In the connecting process of the three elements, the upper member 41, the central member 42 and of the lower element 43, in the recess portion 60, a bimetal 54 is on the valve seat 55 b disposed on the bottom wall 60 b. The bimetallic valve 54 is a disc element with a diameter that is smaller than an inner diameter of the cylindrical wall 60 a. The bimetallic valve 54 moves in the upward and downward direction with the outer peripheral end thereof being reliably fixed.

The bimetal valve 54 described above is installed in the following manner. The outer peripheral end of the bimetallic valve 54 is arranged on the flat portion 55 d, which is generated at the outer end of the inclined rib 55 c in the recess portion 60 . Then the three elements, the upper element 41 , the middle element 42 and the lower element 43 , are connected from above in the recessed portion 60 . Then, the outer peripheral end of the bimetallic valve 54 is arranged between the protruding portions 43 f formed on the lower end surface of the cylindrical body 43 d of the lower member 43 and the flat portion 60 of the above-described inclined rib 55 . Accordingly, the middle portion of the bimetal valve 54 is movable in the upward and downward direction, during this f between the Vorstehabschnitten 43 d d and the flat portion 55 on the lower end surface of the cylindrical body 43 at the outer end of the inclined rib 55 c is generated, is clamped. A space between the recess portion 43 g, which is generated at the lower end of the cylindrical body 43 d and the lower surface of the lower wall 60 b, forms a connecting channel 57 to allow the passage of the fuel or the negative pressure.

The lower side of the bimetallic valve 54 can be brought into contact with the valve seat 55 b, which is produced on the upper surface of the depression section 60 described above. When the bimetallic valve 54 is brought into contact with the valve seat 55 b, the connection between the connection opening 55 a and the inner chamber 56 is interrupted. On the other hand, the state in which the bimetallic valve 54 is released from the valve seat 55 b enables the fuel or the negative pressure to enter the inner chamber 56 via the connection opening 55 a.

In this way, the direct placement of the displacement detection sensor 40 on the cap 12 enables the outer member 53 and the valve support member 55 , which are required in the second embodiment, to be omitted. The manufacturing costs can be reduced. Installation is easy. Furthermore, the use of which enables the recess portion 60 for connection of the displacement detection sensor 40, the reduction in the height of the displacement detection sensor 40th

The third embodiment performs the same functions like the second embodiment.

Although this embodiment has been explained as being characterized by the direct placement of the displacement detection sensor 40 on the cap 12 , it is also possible to connect the unitary displacement detection sensor of the first embodiment in the recess portion 60 of this embodiment. In this case, only the connection opening 55 is created in the lower wall 60 b. Otherwise, the lower wall 60 b is omitted.

Furthermore, the embodiment shown in FIGS. 6 and 7 has been explained as being characterized by using the displacement detection sensor 40 and the bimetallic valve 54 as separate components and connecting them in the recessed portion 60 formed in the upper portion of the cap 12 . Optionally, the embodiment shown in FIGS. 8 and 9 can be used, which also has the feature of using the displacement detection sensor 40 and the bimetal valve 54 as separate elements.

As shown in FIG. 8, the valve support member 55 that supports the bimetallic valve 54 is integrally arranged on the flange 63 formed on the back surface of the cap 12 by thermal welding or the like. Meanwhile, the bimetal valve integrally disposed between these 54th The connecting pipe 61 is arranged on the lower portion of the displacement detection sensor 40 . The connecting pipe is integrally connected to the flange 12 h by thermal welding or the like, which is arranged on the upper part of the cap 12 . According to the arrangement described above, there is no need to form the recess portion 60 on the upper part of the cap 12 as shown in FIGS. 6 and 7.

The embodiment shown in FIG. 9 differs from the embodiment shown in FIG. 8 in that the displacement detection sensor 40 is connected to the cap 12 via the elastic element, which is similar to that shown in FIG. 4. More specifically, the valve support member 55 that supports the bimetallic valve 54 is integrally arranged on the flange 63 formed on a rear surface of the cap 12 by thermal welding or the like. The bimetallic valve 54 is arranged in one piece between them. The connecting pipe 61 is arranged on the lower portion of the displacement detection sensor 40 . The connecting tube 61 is connected to the flange 12 h, which is arranged on the upper part of the cap 12 with a connecting tube 62 made of rubber or a comparable elastic material. With this arrangement, the installation of the displacement detection sensor 40 is easily possible even if the hand pump 15 and other elements are arranged on the upper part of the cap 12 .

Fourth embodiment

This embodiment relates to a fuel supply system having the above-described displacement detection sensor 40 , which is capable of serving as a displacement detection device of the present invention.

Fig. 10 is a schematic diagram showing the fuel supply system according to this embodiment. The basic structure of the system is similar to that shown in FIG. 11. Specifically, the fuel supply system of this embodiment has a fuel tank 4 , a diesel filter 5 , an injection pump 1 , a common pressure line 2 and an injection valve 3 . The fuel tank 4 stores the fuel. The diesel filter 5 removes foreign matter contained in the fuel supplied from the fuel tank 4 . The injection pump 1 pressurizes the fuel that is cleaned by the diesel filter 5 . The pressurized fuel is supplied to the injection valve 3 via the common pressure line 2 and is injected into the internal combustion engine. The displacement, which is caused in the fuel filter 5 is a measuring device including a warning lamp fed 70 which (not shown) near the driver seat, is arranged and is electrically connected to the fuel filter 5, to cause the driver to replace the diesel filter. 5

The displacement detection device 40 is consistent with the displacement detection sensor 40 explained in the previously described embodiments. The displacement detection device 40 is arranged between the diesel filter 5 and the injection pump 1 on the downstream side of the diesel filter 5 . In the drawing, the displacement detection device 40 is shown arranged downstream of the diesel filter 5 and is arranged independently between the diesel filter 5 and the injection pump 1 . This structure can be realized using the connecting pipe 62 shown in FIGS. 4 and 9. Optionally, the displacement detection device 40 can be connected directly or indirectly to a fuel channel that connects the diesel filter 3 to the injection pump 1 .

Of course, the installation of the displacement detection device 40 is not limited to the separate embodiment, and therefore it is possible to integrally arrange the displacement detection device 40 with the diesel filter 5 as shown in FIGS . 2, 5 and 7.

The present invention is not based on the above described embodiments limited and can therefore in can be modified in many ways without departing from the basic idea to deviate from the invention. For example, the bimetallic valve explained as a device to enable the Dislocation detection sensor only becomes operational when the temperature is higher than a predetermined temperature value is. An electromagnetic valve can also be used become. Furthermore, the diesel filter was designed as an execution explained that only the replacement of the filter element requires. However, it is also possible to use both the wrapping also replace the filter element at the same time.

According to the preferred ones described above Embodiments of the present invention is Displacement detection device on the downstream side of the filter device arranged. If the transfer occurs, the driver can reliably by an indicator lamp or a warning buzzer Knowledge. This enables the reduction the economic burden that is caused when the element before reaching the actual lifespan is replaced. Furthermore, it is possible to make abnormal ones Situations such as B. sudden stop of the Internal combustion engine to avoid.

According to the preferred ones described above Embodiments of the present invention is the detection pressure of the displacement detection device to a predetermined one Value set which is higher than an initial one Is a pressure value that can be measured when the diesel filter is in one Is new, and lower than an offset pressure value which is measurable if, as a result of the displacement of the No fuel is supplied to the filter device. At this Arrangement it is possible to change times under Taking into account the actual use of each Flexible adjustment of filter elements. For example, is an earlier one Prefer time to replace the filter elements that used in off-road vehicles, and a later one Prefer time to replace the filter elements that be used in road vehicles. The performance and the economy of the respective diesel filter can be increased.

According to the preferred ones described above Embodiments of the present invention is also one Operation release device also arranged to enable that the displacement detection device is only effective if the temperature of the fuel is higher than one predetermined temperature value. With this structure, it is possible to prevent the Dislocation detection device the dislocation due to the wax deposition from the Fuel detected incorrectly. The unnecessary replacement of the Diesel filters can be reliably prevented. This is preferred for economic reasons. Furthermore, it is possible to increase the reliability of the diesel filter.

According to the preferred ones described above Embodiments of the present invention is the predetermined one Temperature value higher than the wax separation temperature at which Wax is separated from the fuel. With this It is possible to build the detection area for the serious dislocation caused by foreign substances expand. As a result, the Displacement detection accuracy can be increased. It is possible to improve the reliability of the Increase diesel filter.

According to the preferred ones described above Embodiments of the present invention is Operation release device the bimetal valve. The use of the Bimetal valve enables the switching of the Valve at the aforementioned predetermined Temperature value without causing interference. It is possible that Increase reliability of diesel filters.

According to the preferred ones described above Embodiments of the present invention are Dislocation detection device and the operation release device formed integrally with one another. With this structure, the Dislocation detection device and the Operation release device can be integrated in a single unit. The Installation of this device is easily possible. The Production costs can be reduced.

According to the preferred ones described above Embodiments of the present invention is an assembly of the Dislocation detection device and the Operating release device arranged in one piece on the housing element. at With this structure, the displacement detection device can be reliably arranged beforehand on the diesel filter. It it is possible to increase their reliability.

According to the preferred ones described above Embodiments of the present invention is an assembly of the Dislocation detection device and the Operating release device arranged independently of the housing element. In in the event that there is insufficient space to arrange them Assembly on the cap of the diesel filter in the side Direction or in the vertical direction, The above-mentioned structure enables easy arrangement the displacement detection device assembly and the Operation release device using one of one elastic element or the like Connecting pipe.

According to the preferred ones described above Embodiments of the present invention are Dislocation detection device and the operation release device arranged separately. According to those described above preferred embodiments of the present invention is Operating release device on the housing element arranged. For example, the cap that covers the top of the Displacement detection sensor trains used to to clamp the valve seat and the bimetallic valve. The one for it required installation effort can be saved. The number of parts required and the Production costs can be reduced.

diesel filter

Fig. 16 shows a conventional fuel supply system, which mainly comprises an injection pump 101 and an injection valve 103. The fuel supply system also has a common pressure line 102 , a fuel tank 104 and a diesel filter 105 . The injection pump 101 is used to supply the fuel under high pressure. The common pressure line 102 distributes the high-pressure fuel from the injection pump 101 to a plurality of injection valves 103 . In the drawing, black arrows indicate the flow of the fuel that is supplied from the fuel tank 104 to the injection valve 103 , while white arrows show the flow of excess fuel that is returned from the injection pump 101 to the fuel tank 104 .

The diesel filter 105 shown in FIG. 6 is a so-called one-piece water storage design with a cap element 105 a, a filter section 105 b and a water storage 105 c. Fig. 17 shows a schematic structure of this filter. The one-piece water storage design of the diesel filter 105 is mainly formed by the cap element 105 a, which is arranged high, and the filter section 105 b and the water storage 105 c, which is generated in a cup-shaped envelope and is arranged on the bottom of the cap element 105 a.

A hand pump 100 d, which is arranged on the cap element 105 a, is used to discharge the separated water from a fuel supply pipe 100 b, a fuel discharge pipe 100 c and the water reservoir 105 c. The fuel supply pipe 100 b is connected to the fuel tank 104 . The fuel discharge pipe 100 c is connected to the injection pump 101 .

Furthermore, the filter section 105 b is arranged high in the casing 100 a and the water reservoir 105 c is arranged low. The filter section 105 b, which filters out the foreign substances contained in the fuel, has a fuel channel 100 e, a filter element 100 i, consisting of a filter element 100 f and an element holding device 100 h, on which a sealing element 100 g is arranged. The water storage 105 c is generated under the filter section 105 b. The water storage 105 c, which has a function for separating water from the fuel, includes a lower space 100 j for storing the separated water. A level switch 100 k and a drain tap 100 m are arranged in the lower room 100 j. The level switch 100 k detects the amount of the separated water, and the drain tap 100 m is used to drain the separated water.

The fuel, which is introduced into the lower space 100 j via the fuel supply pipe 100 b and the fuel channel 100 e, rotates its direction of flow through 180 ° into the lower space 100 j. Then the fuel flows upward into the filter element 100 f, in which the foreign substances are removed from the fuel. Then the cleaned fuel is discharged through the discharge pipe 100 c. When the fuel turns its direction in the behavior of the fuel described above, the water contained in the fuel is separated in the lower space 100 j. Since the water has a large specific gravity in comparison with the fuel, the separated water as a separated water 100 remains n in the lower space 100 j. The level switch 100 k turns on when the amount of the separated water 100 n reaches a predetermined level. In response, the warning lamp located near the driver's seat turns on to cause the driver to drain the separated water 100 n from the lower room 100 j. The driver opens the drain tap 100 m to drain the separated water 100 n.

As described above, according to the conventional one-piece water storage design of the diesel filter shown in FIGS . 16 and 17, both the filter section 105 b and the water storage 105 c are arranged in one piece in the same casing 100 a. The number of training parts is small. The filter structure is compact.

In general, diesel filters for automobiles are limited in space because the engine room is filled with the engine and its accessories and accessories, and accordingly, there is limited space available for a diesel filter. On the other hand, the conventional diesel filter of the one-piece water storage type shown in Figs. 16 and 17 is characterized in that the filter section 105 b and the water storage 105 c are arranged in series or stacked in the upward and downward directions. In other words, the diesel filter has a vertically extending shape. Therefore, depending on the space available, it becomes difficult to install the diesel filter.

Fig. 18 shows another conventional diesel filter, which is characterized by a filter section and a water reservoir, which are separated from each other. The diesel filter shown in FIG. 18 is a so-called diesel filter with a separate water reservoir, according to which a filter unit 106 and a water storage unit 107 are independently included in a fuel channel. According to this conventional diesel filter with a separate water storage, the function of the filter unit 106 is limited to a filter function, and the function of the water storage unit 107 is limited to a water separation function for separating water from the fuel and for storing the separated water. The filter unit 106 and the water storage unit 107 are each arranged in the fuel passage, as shown in FIG. 18. The construction of the filter unit 106 is essentially the same as in an embodiment of the present invention shown in Fig. 14 (although slightly different in that the cover is not separated from the bottom thereof and is integrally formed with the bottom). The structure of the water storage unit 107 is substantially the same as that of an embodiment of the present invention shown in FIG. 15.

The diesel filter with separate water tank is in this respect, excellent compared to the diesel filter one-piece water storage that the installation space is not so strong is restricted. However, it is necessary to go ahead both the diesel filter with one-piece water storage as also dependent on the diesel filter with separate water tank to prepare from the spatial constraints. The Enlargement of the respective training components, the Molding tools for their manufacture or the production lines to manufacture these components seems to be the reason for to be high production cost.

Furthermore, according to the conventional diesel filter, the element holding device 100 h, which forms part of the filter device 100 i, is arranged under the filter element 100 f, as shown in FIG. 17. The sealing element 100 g is arranged along the outer circumference of the element holding device 100 h. According to this structure, the cap member 105 a must be temporarily removed, and the filter device 100 i is taken out upward when the filter device 100 i is replaced. However, the handling is insufficient due to the presence of the sealing element 100 g, which is arranged on the lower part of the filter device 100 i, which slides with friction along the long inner cylindrical surface of the casing. The sealing element 100 g tends to wear.

Fifth embodiment

FIGS. 12 and 13 show a diesel filter according to the fifth embodiment of the present invention, which is a so-called one-piece water storage type, which has a filter portion and a water storage section, which are integrally formed with each other. FIG. 12 shows a cross-sectional view to show an assembled state of the diesel filter. Fig. 13 shows a cross-sectional view showing a separating state of the diesel filter, in which a cap member and a filter device separate from each other.

The diesel filter 110 consists of a filter section 110 a, a water reservoir 110 b, which is arranged on the bottom of the filter section 110 a, and a cap element 112 , which is arranged on the upper part of the filter section 110 a. The cap member 112 is a member made of resin, on which a fuel supply tube fixing portion 112 d and a Kraftstoffaustragrohr mounting portion 112 e are generated to each other to be diametrically opposed to. A fuel supply pipe 113 with a pack 113 a, which is arranged at the end thereof, is integrally connected to the fuel supply pipe fastening section 112 d. In a similar manner, a fuel discharge pipe 114 with a packing 114 a, which is arranged at the end thereof, is integrally connected to the fuel discharge pipe fastening section 112 e.

Further, when the fuel supply pipe 113 is arranged on the fuel supply pipe fixing portion 112 d, a first check valve 112 f is arranged between them. A second check valve 112 g is arranged above an inlet opening 112 b described further below. The first check valve 112 f and the second check valve 112 g have the same function to enable the fuel to flow from the fuel supply pipe 113 to a filter device 116 to be described later and to prevent the fuel from flowing in the opposite direction to the to ensure undisturbed operation of a hand pump 115 .

The hand pump 115 and a displacement detection sensor 40 are arranged on the cap member 112 . The displacement detection sensor 40 is identical in construction and operation to the displacement detection sensor 40 shown in each of the first through fourth embodiments described above, and therefore will not be explained below.

The hand pump 115 has a hollow pump envelope 115 a, which defines a housing, and a cap portion 115 d. A plunger 115 b, which is elastically pushed upwards by a spring 115 c, is arranged in the interior of the hand pump 115 . The cap portion 115 is provided with an opening (not shown) d. When pressed against an elastic force of the spring 115 c and rotated at a predetermined angle, a flange 115 e, which is arranged at an upper circumferential end of the plunger 115 b, comes into operative relationship with the lower surface of the cap portion 115 d, as in FIG Fig. 12 is shown. The plunger 115 b is kept in a lowered state. If the plunger 115 b is rotated in the opposite direction at a predetermined angle while it is pressed down, the plunger 115 b can move up and jump out when released. By reciprocally moving the plunger 115 b in this state, the air and fuel that are trapped under the plunger 115 b are compressed. The air and the fuel that are compressed in this way by the hand pump 115 are pressed out to the fuel discharge pipe 114 by the function of the first check valve 112 f and the second check valve 112 g. The hand pump 115 is used immediately after the filter device 116 is replaced or when water needs to be removed from the diesel filter 110 . Although the hand pump 115 is arranged on the cap member 112 according to this embodiment, it is possible to arrange the hand pump 115 in any other section.

The filter section 110 a described above consists of a filter casing 111 a and the filter device 116 . The filter casing 111 a is a cylindrical hollow element made of resin with an open upper part and an open bottom. A thread 122 is generated on an outer peripheral portion of an upper end of the sheath 111 a. A flange 137 is generated on an outer peripheral portion of the lower end of the sheath 111 a. With regard to the connection between the filter casing 111 a and the cap element 112 , the filter device 116 is first received in the casing 111 a from above. Then, the cap member 112 is connected to the upper end portion of the filter case 111 a under the condition that a packing 121 is arranged at the lower end portion 112 a of the cap member 112 . Then a fastener 123 engages with the thread 122 , which is generated on the outer cylindrical portion of the upper end of the filter casing 111 a, and is tightened to hermetically connect them. When the filter device 116 is replaced, the above-mentioned elements are disassembled in the reverse order.

The filter device 116 has a fuel passage 118 disposed in the center thereof to serve as a core, a filter element 117 composed of coaxially arranged papers or the like wrapped around the outer cylindrical surface of the fuel passage 118 , and one to keep element holding device 119 disposed at the upper end of the filter element 117 to the filter element 117th The filter device 116 is not limited to the combination of the components described above. Any other filter device is acceptable as long as it has the basic filtering function.

An annular sealing element 120 is arranged on the outer cylindrical section of the element holding device 119 . The element holding device 119 and the filter cover 111 a are hermetically connected via the sealing element 120 in order to prevent the unfiltered fuel from escaping to an outlet opening 112 c. In this way, the element holding device 119 is arranged at the upper end of the element 117 . This is advantageous if the filter device 116 is replaced. If the filter device is replaced 116 in more specific manner, the filtering device must be taken out of the filter wrap purple 116th According to the structure of this embodiment, the sealing element 120 can be easily removed from the filter envelope 111 a by slightly lifting the filter device 116 upwards. The filter device 116 can then be raised uniformly without resistance. The operation to remove the filter device 116 is easy to perform. Furthermore, if the filter device 116 is raised, the sealing element 120 slides a very short distance under friction, which acts between the sealing element 120 and the filter casing 111 a. The shorter the distance, the less the sealing element 120 wears out. Thus, the filter device 116 can be reused even after it is removed from the filter envelope 111 a.

The water tank 110 as described above is formed b b through a water storage enclosure 111 for storing water in the situation. The water storage jacket 111 b is a cup-shaped structure with an open upper part. The fuel flows into the interior of the water storage envelope 111 b. A lower space 127 is defined as a storage space for storing the water separated from the fuel. A flange 138 is formed at the upper end of the water storage enclosure 111 b so that it extends along the outer circumference. The flange 138 corresponds in size to the flange 137 , which is produced on the outer peripheral portion of the lower end of the filter casing 111 a. If the diesel filter 110 is used as a one-piece water storage version, both casings 111 a and 111 b are mounted on their flanges 137 and 138 and fixedly arranged by an appropriate fastening method, such as. B. vibration welding, thermal welding or ultrasonic welding.

If the filter device 116 is arranged in the filter casing 111 a, the lower section of the element holding device 119 , which holds the filter device 116 , comes into contact with a stop section 126 of the filter casing 111 a and is arranged there firmly. In the state that the cap member 112 is placed at the upper opening of the filter case 111 a, the lower end portion 112 a of the cap member 112 comes into contact with the upper surface of the member holder 119 . Thus, the filter device 116 is arranged between the stop portion 126 of the filter cover 111 a and the lower end portion 112 a of the cap member 112 . An upper space 125 is created above the filter device 116 , while the lower space 127 is created below the filter device 116 .

A ring member 124 with the inlet opening 112 b in its upper portion extends downward from the center of the lower surface of the cap member 112 . After the filter device 116 is received in the filter casing 111 a, the cap element 112 is tightened. In this state, the upper protruding portion 118 a of the fuel passage 118 is connected hermetically with the ring member 124th All the fuel that is introduced from the fuel supply pipe 113 through the inlet opening 112 b into the ring member 124 flows through the fuel passage 118 into the lower space 127 .

The fuel is introduced into the lower space 127 is slow in the lower space 127th The water separates from the fuel and settles as separated water 136 at the bottom of the lower space 127 . On the other hand, after the water is separated, the fuel changes the flow direction and enters the filter element 117 . The filter element 117 filters the fuel to remove the contaminants. After separating the contaminants, the fuel is pressed to the upper space 125 and then discharged to the fuel discharge pipe 114 through the outlet opening 112 c, which is formed in the upper surface of the cap member 112 .

A level switch 128 and a drain tap 134 are arranged in the lower space 127 . The level switch 128 is a float version which has a hollow rod element 129 and a float 130 . Hollow bar member 129 is a thin, longitudinally extending member with an opening at its lower end. A screen stopper 129a is positioned at the upper portion of the hollow rod member 129th A switch section 132 and a feed line 133 are connected to one another and are arranged in the cavity of the rod element 129 .

The float 130 is a hollow member made of resin with an opening in the middle. A ring magnet 131 is arranged at its lower opening. The float 130 is slidable in the up and down direction along the rod member 129 . The vertical position of the float 130 depends on the amount of separated water 136 stored in the lower space 127 . When the float 130 comes into contact with the screen stop 129 a, the volume of the separated water stored reaches a dangerous level. D. h., The amount of separated water 136 that is stored in the lower space 127, increases to a predetermined value, and the float 130 is engaged with the shield stopper 129a in contact. At this moment, the magnet 131 arranged on the float 130 pulls a movable contact of the switch portion 132 to the fixed contact thereof. The movable contact is brought into contact with the fixed contact. The warning lamp, which is located near the driver's seat, is switched on. After confirmation of the activation of the warning lamp, the driver opens the drain tap 134 , which is arranged in the bottom of the water storage envelope 111 b, in order to drain the separated water 136 from the lower space 127 . The drain valve 134 opens an outlet channel 135 when the driver turns the screw section by hand. In this case, it is possible to use the hand pump 115 .

Sixth embodiment

FIGS. 14 and 15 show a diesel filter according to the sixth embodiment of the present invention, which is a so-called separate water tank design that includes a filter section and a water storage section which are separated from each other. Fig. 14 is a cross-sectional view shows a separate filter unit 140. Fig. 15 is a cross-sectional view of a separate water storage unit 150. The filter unit 140 and the water storage unit 150 are arranged in the fuel passage, as shown in FIG. 18. The components that are the same as those explained in the fifth embodiment are denoted by the same reference numerals. The detailed explanation of these components is omitted because it was done in the fifth embodiment.

The filter unit 140 shown in FIG. 14 is used to remove foreign matter from the fuel. The filter unit 140 has a filter section 110 a, a cover element 141 , which is arranged on the bottom of the filter section 110 a, and a cap element 112 , which is arranged on the upper part of the filter section 110 a. The filter section 110 a and the cap member 112 are the same as those explained in the fifth embodiment. Even in the case that the diesel filter must be a separate water memory execution result of space limitations, both the filter portion 110 a and the cap member 112 can be used directly, without modifications, in comparison with the case where they are in a diesel filter of the one-piece water memory execution are involved.

The cover member 141 is not so different in shape except for the low height of the water storage case 111 b, which is explained in the fifth embodiment. The cover element 141 is a flat disk or has a shell shape with an open upper part. The cover 141 closes the lower opening of the filter section 110 a. The fuel flows from the fuel channel 118 into the interior of the cover element 141 . The cover member 141 has a function for forcing the directional rotation of the fuel toward the filter element 117 . A flange 142 is formed on the upper end of the cover member 141 so as to extend along the outer circumference. The flange 142 is the same size as the flange 137 which is formed on the outer peripheral portion of the lower end of the filter cover 111 a. Both the sheath 111 a and the cover 141 are mounted on their flanges 137 and 142 and fixedly arranged by an appropriate fastening method, such as. B. vibration welding, thermal welding or ultrasonic welding to form the filter unit 140 .

If the filter device 116 is arranged in the filter casing 111 a, the lower section of the element holding device 119 , which holds the filter device 116 , comes into contact with a stop section 143 of the filter casing 111 a and is arranged there in a stationary manner. In the state that the cap member 112 is placed at the upper opening of the filter case 111 a, the lower end portion 112 a of the cap member 112 comes into contact with the upper surface of the member holder 119 . Thus, the filter device 116 is arranged between the stop portion 143 of the filter casing 111 a and the lower end portion 112 a of the cap member 112 . A lower space 144 with a small capacity is created in the cover member 141 .

The filter unit 140 , if used as part of the separate water storage version of the diesel filter, only requires the cover element 141 when the modification of the one-piece water storage version of the diesel filter takes place. The production costs can be significantly reduced.

The water storage unit 150 shown in FIG. 15 has a function of separating water from the fuel and storing the separated water. The water storage unit 150 has a water storage 110 b and a cap element 151 , which is arranged on the upper part of the water storage 110 b. The water reservoir 110 b is the same as that explained in the fifth embodiment. Even in the case that the diesel filter must be a separate water memory execution result of space limitations, the water tank 110 can be used b directly, without any modification, as compared with the case that the inclusion is present in a one-piece water storage embodiment of the diesel filter.

The cap element 151 is a flat disk or has a shell shape which essentially corresponds to the cover element 141 described above. A fuel supply pipe 152 and a fuel discharge pipe 153 are arranged on the side wall of the cap member 151 so as to face each other. A flange 154 is formed at the lower end of the cap member 151 so as to extend along the outer periphery. The flange 154 is consistent in size with the flange 138 which is generated b on the outer peripheral portion of the upper end of the water reservoir 110th Both the water reservoir 110 b and the cap member 151 are mounted on their flanges 138 and 154 and fixedly arranged by an appropriate fastening method, such as. B. vibration welding, thermal welding or ultrasonic welding to form the filter unit 140 .

The water reservoir 150 , if used as part of the separate water reservoir design of the diesel filter, only requires the cap member 151 when modified from the one-piece water reservoir design of the diesel filter. As with the filter unit 140 , the production cost can be significantly reduced.

The filter unit 140 shown in FIG. 14 and the water storage unit 150 shown in FIG. 15 are arranged separately in the fuel passage that connects the fuel tank 104 and the injection pump 101 , as shown in FIG. 18. The water storage unit 150 separates water from the fuel. The filter unit 140 removes foreign matter from the fuel.

According to the above-described embodiments the diesel filter the filter section and the Water storage section, which are formed separately. By doing Case that the diesel filter has no spatial restrictions subject, the filter section and the Water storage section can be assembled in one piece to a to form a one-piece water storage system. If on the other hand the diesel filter is subject to spatial restrictions the filter section is combined with the cover element, which is an additional element created by the Water storage section is replaced to form the filter unit.

On the other hand, the upper opening of the Water storage section closed by the cap member, which a additional element is that through the filter section is replaced to form the water storage unit. The The filter unit and the water storage unit are separate formed and arranged in the fuel passage to a separate water storage design without any complicated modifications are required. The additional components mentioned in the above Modifications are necessary, only the cover element and the cap element. Many of the training components the one-piece water storage version of the diesel filter can be used directly. It is therefore possible to Production costs increase significantly compared to the case lower that all components are newly manufactured to one separate water storage version of the diesel filter train.

According to the above-described embodiments, the Filter device with respect to the envelope from above removable. The sealing element is only on the upper section arranged the filter device. This structure provides the Effect of facilitating the removal operation of the Filter device and accordingly facilitates the replacement process the filter device and shortens that for this action required time. Production costs can be lowered. It is also possible the probability to reduce that the sealing element by the Filter device is worn out when the filter device is taken out. The sealing element can be reused. The cost of components and parts can be reduced.

fuel

Fig. 30 shows a conventional fuel supply system, which mainly comprises an injection pump 201 and an injection valve 203rd The fuel supply system also has a common pressure line 202 , a fuel tank 204 and a diesel filter 205 . The injection pump 201 is used to supply high pressure fuel. The common pressure line 202 distributes the high pressure fuel from the injection pump 201 to a plurality of injection valves 203 . In the drawing, black arrows indicate the flow of the fuel that is supplied from the fuel tank 204 to the injection valve 203 , while white arrows indicate the flow of excess fuel that is returned from the injection pump 201 to the fuel tank 204 .

As described above, the fuel contains foreign matter such as. B. dusts, solid particles of rust, carbon particles, rubber-like mud and water or moisture components. These foreign matters cause abrasion and buildup in the injector 203 or the like, and must be removed accordingly. In order to avoid this problem, the diesel filter 205 is arranged. The diesel filter is explained below for better understanding. However, the following explanation is also applicable to fuel filters.

Fig. 31 shows an example of a conventional diesel filter. A diesel filter 200 a has a cap element 200 b, a cup-shaped sheathing body 200 c, which is arranged on the lower portion of the cap element 200 b, and a filter device 200 i, which is removably received in the sheathing body 200 c.

The cap member 200 b is provided with a fuel supply pipe 200 d to be connected to the fuel tank 204, a Kraftstoffaustragrohr to the air from the fuel passage discharge 200 e for connection to the injection pump 201 and a hand pump 200 h that is used.

A filter device 200 i is removably received in the wrapping body 200 c. The filter device 200 i includes a filter element 200 j on for filtering the fuel, a fixing pipe 200 m, which is arranged in the center of this element 200 j, so as to extend in the up and down direction to the filter device 200 i on the cap member 200 b to be fixed and serve as a fuel passage, and a lower holding member 200 k for holding the lower end of the element 200 j. The filter device 200 i is accommodated in the wrapping body 200 c. The cap element 200 b is arranged on the upper part of the wrapping body 200 c. The filter device 200 i is thus clamped in the sheathing body 200 c by the cap element 200 b.

The fuel that is introduced from the fuel supply pipe 200 d into the wrapping body 200 c is filtered by the filter device 200 i and then discharged via the fuel discharge pipe 200 e.

In general, diesel filters for automobiles are replaced when the route has reached a predetermined value previously set by automobile manufacturers, or when dealers or users recognize the displacement of filters. In this regard, the conventional diesel filter of a filter device replacement type shown in Fig. 31 is advantageous in that the component to be replaced is limited to the filter device only, and the replacement process is easy, and further in that the economic burden on the user can be reduced.

According to the conventional one described above Diesel filters of a filter device replacement design can, however the filter device due to a carelessness during the replacement process may or may not be arranged deliberately removed from the wrapper. If that Diesel filter in this state that the filter element is missing, continues to be used, the unfiltered fuel can be the Internal combustion engine are supplied. This can be a Cause damage to the internal combustion engine. In the worst Case, the internal combustion engine can suddenly stop, when a motor vehicle is driving.

Seventh embodiment

Figs. 19 to 23 show a filter device-Auswechselausführung of the diesel filter according to the seventh embodiment of the present invention having a valve which serves as a device for detecting failure of an installation of the filter device. Fig. 19 is a cross-sectional view showing an overall construction of the diesel filter having a filter device. Fig. 20 is a partial cross sectional view showing the position of an installation failure detection valve in the state that the filter device is not installed. Fig. 21 is a partial cross sectional view showing the position of the installation failure detection valve in the state that the filter device is installed. FIG. 22A shows a cross-sectional view and FIG. 22B shows a bottom view of FIG. 22A, which together show an annular projection which forms a valve seat, in which the valve is arranged. FIG. 23A shows a cross-sectional view and FIG. 23B shows a bottom view of FIG. 23A, which together show the valve. The diesel filter is explained below for better understanding. However, the following explanation is also applicable to fuel filters.

A diesel filter 205 comprises a casing to form a casing on which is composed of a cover body 211 which is disposed low, and to the upper opening of envelope body to close a cap member 212 which is disposed above the cover body 211 211th The cap member 212 is removable with respect to the wrapping body 211 . Are the cap member 212 is a member made of resin, on which a fuel supply tube fixing portion 212 a and a Kraftstoffaustragrohr mounting portion 212 b is generated to be in a diametrical direction in opposition. A fuel supply pipe 213 with a pack 213 a, which is arranged at the end thereof, is integrally connected to the fuel supply pipe fastening section 212 a. In a similar manner, a fuel discharge pipe 214 with a packing 214 a, which is arranged at the end thereof, is integrally connected to the fuel discharge pipe fastening section 212 b.

Further, when the fuel supply pipe 213 is arranged on the fuel supply pipe mounting portion 212 a, a first check valve 212 c is arranged between them. A second check valve 212 d is arranged over an inlet opening 230 described further below. The first check valve 212c and the second check valve 212d have the same function to enable fuel to flow in one direction from the fuel supply pipe 213 to a filter device 216 to be described later and to stop the flow of the fuel in the opposite direction, to ensure the undisturbed operation of a hand pump 215 described below.

Furthermore, an annular projection 212 f is produced in the middle of the bottom of the cap element 212 . The annular projection 212 f extending downwardly to be connected to the later-described filter device 216 to supply the fuel to the filter device 216th An inlet opening 230 is created in the annular projection 212 f.

The hand pump 215 and a displacement detection sensor 40 are arranged on the cap member 212 . The displacement detection sensor 40 is identical in construction and operation to the displacement detection sensor 40 described in any one of the first through fourth embodiments described above, and therefore will not be explained below.

The hand pump 215 has a hollow pump casing 215 a, which defines a housing, and a cap portion 215 d.

A plunger 215 b, which is elastically pushed upwards by a spring 215 c, is arranged in the interior of the hand pump 215 . The cap portion 215 d is provided with an opening (not shown). When pressed against an elastic force of the spring 215 c and rotated at a predetermined angle, a flange 215 e, which is arranged at an upper circumferential end of the plunger 215 b, comes into operative relationship with the lower surface of the cap section 215 d, as in FIG Figure shown. 19th The plunger 215 b is kept in a lowered state. If the plunger 215 b is rotated at a predetermined angle in the opposite direction while it is pressed down, the plunger 215 b can move up and jump out when released. By reciprocally moving the plunger 215 b in this state, the air and fuel compressed under the plunger 215 b are compressed. The air and the fuel that are compressed in this way by the hand pump 215 are pressed out to the fuel discharge pipe 214 by the function of the first check valve 212 c and the second check valve 212 d. Hand pump 215 is used immediately after filter device 216 is replaced or when water needs to be removed from diesel filter 205 . Although the hand pump 215 is arranged on the cap member 212 according to this embodiment, it is possible to arrange the hand pump 215 in any other section. It is also possible to arrange the hand pump 215 separately from the diesel filter 205 .

The wrapping body 211 is a resin-made container with an open top. A thread 211 a is generated on an outer periphery of an upper end portion of the wrapping body 211 . With regard to the connection between the casing body 211 and the cap element 212 , the filter device 216 is first accommodated in the casing 211 . Then, the cap member 212 is connected to the upper end portion of the wrapping body 211 in the state that a packing 212 g is arranged on the lower end portion 212 e of the cap member 212 . Then, a fastener 223 is engaged with the thread 211 a, which is generated on the outer cylindrical portion of the upper end of the sheathing body 211 and is tightened to hermetically connect them. When the filter device 216 is replaced, the above-mentioned elements are disassembled in the reverse order.

The filter device 216 has a mounting tube 218 arranged in the center thereof to serve as a core, a filter element 217 made of coaxially arranged papers or the like wrapped around the outer cylindrical surface of the mounting tube 218 , and one keeping lower end plate 220 which is disposed at the lower end of the filter element 217 to the filter element 217th The filter device 216 is not limited to the combination of the components described above. Any other filter device is acceptable as long as it has the basic filtering function.

The lower inner surface of the wrapping body 211 is formed with numerous short ribs 211 b, which are arranged at equal angular intervals. When arranged in the wrapping body 211 , the lower end plate 220 of the filter device 216 is brought into contact with the ribs 211 b and positioned there. In the state that the filter device 216 is accommodated in the casing body 211 , an upper space 221 is provided above the filter device 216 , while a lower space 222 is provided below the filter device 216 .

The annular projection 212 f with the inlet opening 230 at its upper portion extends downward from the center of the lower surface of the cap member 212 . After the filter device 216 is received in the wrapping body 211 , the cap 212 is tightened. In this state, the upper protruding portion 218 a of the fixing tube 218 with the annular projection 212 f b hermetically connected via a pack 218th All the fuel that is introduced into the annular projection 212 f via the fuel supply pipe 213 flows through the fastening pipe 218 into the lower space 222 .

The fuel that is introduced into the lower space 222 changes the direction of flow and enters the filter element 217 . The filter element 217 filters the fuel to remove the contaminants. After separation of the impurities, the fuel is pushed out to the upper space 221 and then h through the outlet port 212, which is generated in the upper surface of the cap member 212, discharged to the Kraftstoffaustragrohr 214th

The device for detecting an installation failure of the filter device 216 according to this embodiment will be explained below. As explained in detail in FIGS . 20 and 21, the inlet opening 230 of the annular projection 212 f has an opening 230 a with a small diameter, an opening 230 b with a medium diameter and an opening 230 c with a large diameter, in addition to a first step section 231 a, which is generated between the opening 230 a with a small diameter and the opening 230 b with a medium diameter, and a second step portion 231 b, which is generated between the opening 230 b with a medium diameter and the opening 230 c with a large diameter. The small diameter opening 230a is formed in a cylindrical shape with an inner diameter D1, as shown in Fig. 22B. The opening 230a with a small diameter is provided with a rectangular groove 232 which extends in the radial direction and has a length D2 and a width D3.

A valve 235 , which is able to detect an installation failure of the filter device 216 according to the present invention, is arranged at the opening 230 a with a small diameter, as shown in the drawing. The valve 235 is an element made of resin, which has a round plate portion 235 a, a rod portion 235 b and a front end portion 235 c.

The round plate portion 235 a is a disc element with an outer diameter d1, which is larger than the inner diameter D1 of the opening 130 a with a small diameter of the annular portion 112 f and smaller than an inner diameter D of the opening 130 c with a large diameter of the annular projection 112 f is. The rod portion 235b is a plate member having a width d2 and a length d3, as shown in Figs. 23A and 23B. The width d2 of the rod portion 235 b is smaller than the width D3 of the rectangular groove 232 , which is produced at the opening 230 a with a small diameter of the annular projection 212 f. The length d3 of the rod section 235 b is shorter than the length D2 of the rectangular groove 232 and is longer than the inner diameter D1 of the opening 230 a with a small diameter and also longer than an inner diameter 2 R of the fastening tube 218 . Furthermore, the front end portion 235 c is formed in a hook shape. The lateral width d4 of the front end portion 235 c is larger than the width D3 of the rectangular groove 232 . The height h of the front end portion 235 c is less than the height H between the first step portion 231 a and the second step portion 231 b. The length of the front end portion 235 c is equal to the length d3 of the rod portion 235 b.

The valve 235 is arranged in the following manner. Before the hand pump 215 and the second check valve 212 d are arranged on the cap element 212 , the valve 235 is inserted into the inlet opening 230 from above, the front end section 235 c being held as a front side down. Since the lateral width d4 of the front end portion 235 c of the valve 235 is wider than the width D3 of the rectangular groove 232 , the front end portion 235 c of the valve 235 is brought into contact with the rectangular groove 232 . However, when a force acts on the front end portion 235 c, the hook shape of the front end portion 235 c enables the front end portion 235 c to enter the rectangular groove 232 . That is, the front end portion 235 c of the valve 235 elastically deforms and enters the rectangular groove 232 . When the front end portion 235 c has completely entered the rectangular groove 232 , the front end portion 235 c is returned to the original shape. Therefore, the front end portion 235 c of the valve 235 cannot be easily pulled out of the rectangular groove 232 .

After the valve 235 is engaged in the right-angled groove 232 , the valve 235 falls due to its own weight until the lower surface of the round plate portion 235 a of the valve 235 is stopped by the upper surface, which has the small diameter opening 230 a annular projection 212 f defined, as shown in Fig. 20.

In this state, the filter device 216 is inserted into the wrapping body 211 . The upper opening of the wrapping body 211 is closed by the cap element 212 . At this moment, the upper projecting portion 218 enters a of the holding tube 218 in the opening 230 c having a large diameter of the annular projection 212 f a. Since the length d3 of the rod portion 235 b or the front end portion 235 c of the valve 235 is longer than the inner diameter 2 R of the fixing pipe 218, the lower surface of the front end portion 235 c of the valve 235 with the upper surface of the upper projection portion 218a of the mounting tube 218 brought into contact. After the upper surface of the upper projection portion 218 c of a fixing tube 218 with the lower surface of the front end 235 of the valve 235 comes into contact, the upper protruding portion 218 pushes a fastening of the pipe 218, the valve 235 upward. The round plate portion 235 a of the valve 235 separates from the upper surface, which defines the small diameter opening 230 a of the annular projection 212 f, to open the small diameter opening 230 a.

Finally, the upper projecting portion 218 enters a fixing of the tube 218 in contact with the second step portion 231b and stops, as shown in Fig. 21 is shown. In this final state, as is clear from the drawing, the valve 235 is arranged at a distance from the upper surface, which defines the opening 230 a with a small diameter of the annular projection 212 f. Therefore, the opening 230 a with a small diameter is obtained in the open state. In this case, from the relationship that the height h of the front end portion 235 c of the valve 235 is smaller than the height H between the first step portion 231 a and the second step portion 231 b, the mounting tube 218 cannot with the front end portion 235 c of the valve 235 collide.

Valve 235 , which is capable of detecting the failure to install filter device 216 , is configured as described above. As long as the assembly is carried out in the state that the filter device 216 is accommodated in the sheathing body 211 , the valve 235 is spaced from the upper surface, which defines the opening 230 a with a small diameter of the annular projection 212 f, as in FIG. 21 is shown. In this condition, the fuel can usually flow through the inlet port 230 .

However, in the event that assembly is performed without placing a new filter device 216 in position due to a neglect or failure, the valve 235 will drop due to its weight, as shown in FIG. 20. The valve 235 closes the opening 230 a with a small diameter of the annular projection 212 f. When the internal combustion engine starts operating in this state, a negative pressure occurs on the downstream side of the valve 235 . The valve 235 is pressed vigorously to the upper surface defining the small diameter opening 230 a of the annular projection 212 f. The fuel supply is completely interrupted. The internal combustion engine is then unable to work from the start or stop, even if it initiates the operation. Accordingly, a person in charge of replacing the filter device can immediately recognize its failure or failure in the filter device installation process.

Eighth embodiment

Fig. 24 to 26 collectively show another embodiment of the filter device installation failure sensing valve according to an eighth embodiment of the present invention. Fig. 24 is a cross sectional view partially showing the position of the installation failure detection valve in the state that the filter device is not arranged. Fig. 25 is a cross sectional view partially showing the position of the installation failure detection valve in the state that the filter device is arranged. Fig. 26A shows a top view of a push member used to open the valve shown in Figs. 24 and 25. FIG. 26B and 26C show plan views of the modified pusher elements. The portions common to those shown in the seventh embodiment are denoted by the same reference numerals. The detailed explanation of these components has already been given in the seventh embodiment and is accordingly omitted in the following description.

The diesel filter used in this embodiment is with that in the seventh embodiment explained in agreement, except for the shape of the valve and a pushing element that is used to move the valve is arranged above.

The wrapping body 211 , the cap member 212, and the filter device 216 are the same in construction as those explained in the seventh embodiment. The installation failure detection valve is mainly explained below in the state that the filter device 216 is arranged.

An annular projection 240 with an opening in the center thereof is produced on a cylindrical inner surface of the annular projection 212 f. A plurality of lower protrusions 242 are evenly formed on the lower surface of the ring protrusion 240 to extend downward. A plurality of ribs 243 are formed at equal intervals on the cylindrical inner surface of the ring projection 212 f. The ribs 243 extend in the upward and downward direction to the area lower than the ring projection 240 . At the lower end portion of these ribs 243 , a flat annular groove 244 is formed along the cylindrical inner surface of the ring projection 212 f.

Reference numeral 245 denotes a valve stop plate made of resin. The outside diameter of the valve stop plate 245 is slightly larger than the inside diameter of the ring projection 212 f. The valve stop plate 245 has an opening 246 to allow fuel flow. The valve stop plate 245 is press-fitted into the flat annular groove 244 created along the cylindrical inner surface of the ring projection 212 f. Furthermore, a valve 247 is arranged above the valve stop plate 245 . The valve 247 is a resin-made member that has an outer diameter that is smaller than an inner diameter of a circle bounded by the plurality of ribs 243 described above. Furthermore, the outside diameter of the valve 247 is larger than the opening 246 of the valve stop plate 245 . When the valve 247 comes into contact with the upper surface of the valve stop plate 245 , the opening 246 of the valve stop plate 245 is closed by the valve 247 . Therefore, the flow of fuel into the inlet port 230 is interrupted.

Furthermore, a spring 248 is arranged between the valve 247 and the ring projection 240 . To prevent the spring 248 from shifting or coming loose, the upper end portion of the spring 248 is located in the clearance between the lower protrusions 242 extending from the lower surface of the ring protrusion 240 and the ribs 243 .

The assembly of the elements described above is then explained. First of all, the cap member 212 is inverted. The spring 248 is inserted into the inlet opening 230 . In this case, the front end of the spring 248 is connected in the space between the lower protrusions 242 of the ring protrusion 240 and the ribs 243 . The valve 247 is then inserted and brought into contact with the rear end of the spring 248 . Thereafter, the valve stop plate 245 is depressed from above the valve 247 . In the depression process, the valve stop plate 245, the valve stop plate 245 is engaged with the valve 247 in contact. However, the valve stop plate 245 is further depressed against an elastic force of the spring 248 . Then, the outer peripheral portion of the valve stopper plate 245 engages with the flat annular groove 244 or fits in the flat annular groove 244 created along the cylindrical inner surface of the annular projection 212 f. If the valve stop plate 245 is depressed further, the valve stop plate 245 hits the ribs 243 and accordingly cannot exceed this level. Even if the depressing force is removed from the valve stop plate 245, then the valve stop plate is reliably held in the annular groove 244 245 and not be released. In this case, the previous application of an adhesive in the groove 244 is effective to securely locate the valve stop plate 245 .

In this state, the valve 247 shown in FIG. 24 is elastically urged by the spring 248 and is brought into contact with the valve stop plate 245 . Therefore, the opening 246 of the valve stop plate 245 is closed by the valve 247 . That is, in the state of FIG. 24, when the filter device 216 is not located or installed in the shroud body 211 , the valve 247 closes the opening 246 of the valve stop plate 245 to stop the fuel flow.

The sealing member is explained below. The filter device 216 is the same as that explained in the seventh embodiment. A pressing member 250 made of resin, which consists of a supporting body 251 and a protruding body 252 , is produced on the upper protruding portion 218 a of the fixing tube 218 , which extends in the upward and downward direction in the center of the filter device 216 .

The support body 251 is a rod-shaped element that extends horizontally in the radial direction from the inner surface of the upper protruding portion 218 a with a projection length equal to the radius. The protrusion body 252 is a rod-shaped member that extends upward from the distal end of the horizontally extending support body 251 . The length of the protruding body 252 is larger than the thickness of the valve stop plate 245 described above. The two elements 251 and 252 are produced in one piece with the fastening tube 218 . FIG. 26A is a plan view showing the pressing element 250.. FIG. 26B and 26C show alternative embodiments of the pushing member 250, in which the Vorstehkörper 252 with is consistent in Fig. 26A. However, the embodiment shown in FIG. 26B differs in that the support body 251 has the length equal to the diameter, while the embodiment shown in FIG. 26C shows the support body 251 formed in a cross shape.

Fig. 25 is explained below. When the filter device 216 is inserted into the sheathing body 211 and the opening of the sheathing body 211 is closed by the cap element 212 , the upper projecting section 218 a of the fastening tube 218 enters the inlet opening 230 of the ring projection 212 f. The upper protruding portion 218 a of the fixing pipe 218 is stopped until it through the valve stop plate 245 is inserted. Since the length of Vorstehkörpers 252 is greater than the thickness of the valve stop plate 245, the distal end enters the Vorstehkörpers 252 in contact with the valve 247, before the upper protruding portion is inserted 218 a of the holding tube 218 in the valve stop plate 245th The projecting body 252 then presses the valve 247 upward against the elastic force of the spring 248 . Then, when the upper protruding portion is brought 218a of the fixing tube 218 with the valve stop plate 245 in contact with the upper sliding movement of the fixing pipe 218 is stopped. In this state, as shown in FIG. 25, the valve 247 opens the opening 246 of the valve stop plate 245 .

The above-described valve 247 and the pressing member 250 cooperatively form a device for detecting the installation failure or installation failure of the filter device 216 according to this embodiment. In the event that the assembly process is complete with the filter device 216 properly positioned in the enclosure body 211 , the valve 247 is spaced from the opening 246 of the valve stop plate 245 , as shown in FIG. 25. Therefore, the fuel can flow through the inlet port 230 as usual.

However, in the event that the assembly process was accomplished without installing or locating a new filter device 216 in position due to a neglect or failure, the valve 247 is resiliently urged downward by the spring 248 as shown in FIG . Therefore, the valve 247 closes the opening 246 of the valve stop plate 245 . When the engine initiates operation in this state, a negative pressure occurs on the downstream side of the valve 247 . The valve 247 is pressed firmly against the upper surface of the valve stop plate 245 in which the opening 246 is defined. The supply of fuel is completely stopped. The engine is unable to work from the start or stop soon, even if it starts. Accordingly, a person in charge of replacing the filter device can immediately recognize its failure or failure in the filter device installation process.

Ninth embodiment

Fig. 27 shows another kind of the installation failure detection valve of the filter device according to a ninth embodiment of the present invention, characterized in that the valve and the pushing element as described in the seventh and eighth embodiments are not used, and in that already existing ones Components are used. That is, when the first check valve and the second check valve are necessary for the hand pump, the installation failure detection valve of the ninth embodiment is characterized in that the second check valve is integrally formed with the filter device. The portions that are the same as those described in the seventh embodiment are denoted by the same reference numerals. The detailed description of these components has already been made in the seventh embodiment and is accordingly omitted in the following description.

The sheathing body 211 , the cap member 212, and the filter device 216 are the same in structure as those described in the seventh embodiment. The installation failure detection valve in the state that the filter device 216 is disposed will be mainly explained below.

The filter device 216 has a mounting tube 218 arranged in the center thereof to serve as a core, a filter element 217 made of coaxially arranged papers or the like wrapped around the cylindrical outer surface of the mounting tube 218 , and a lower one to keep the end plate 220, which is arranged at the lower end of the filter element 217 to the filter element 217th A swell section 255 is produced on the upper projecting section 218 a of the fastening tube 218 .

An annular projection 212 f, which has an inlet opening 230 at its upper portion, extends downward from the center of the lower surface of the cap member 212 . After the filter device 216 is received in the wrapping body 211 a, the cap element 212 is tightened. In this state, the upper projecting portion 218 is a b of the mounting tube 218 via a packing 218, which is disposed along the outer peripheral portion, with the annular projection 212 f hermetically joined. All the fuel that is introduced from the fuel supply pipe 213 through the inlet opening 230 into the ring projection 212 f flows from the ring projection 212 f into the lower space 222 . According to the seventh embodiment, the cap element 212 is equipped with the hand pump 215 , the first check valve 212 c and the second check valve 212 d. When the hand pump is reciprocally moved in the upward and downward direction 215, the fuel and the air are through the function of the first check valve 212 c and the second check valve 212 of the internal combustion engine supplied d.

According to this ninth embodiment, the cap element 212 is equipped with the hand pump 215 and the first check valve 212 c. A valve according to the second check valve 212 c is disposed in the swell portion 255, which is generated at the upper protruding portion 218 a of the holding tube 218th

Fig. 27 shows the state of the ninth embodiment. The device for detecting the installation failure or installation error of the filter device 216 has a spring 257 , a valve stop plate 258 and a valve 259 . The spring 257 has a weak spring force so that the resistance to the fuel is small and the inlet opening 230 can open immediately when the fuel flows. The valve stop plate 258 is an annular member with an outer diameter that is slightly smaller than the inner diameter of the swell portion 255 . An opening 258 a is provided in the middle of the valve stop plate 258 . The diameter of the opening 258 a is smaller than the outer diameter of the valve 259 . The valve 259 is a thin disc plate with an outer diameter that is moderately smaller than the inner diameter of the swell portion 255 , but larger than the inner diameter of the opening 258 a of the valve stop plate 258 .

The spring 257 , the valve stop plate 258 and the valve 259 are previously assembled to form a valve unit 256 as a whole. The arrangement of the valve unit 256 in the filter device 216 is performed by press fitting of the valve unit 256 in the swelling portion 255 formed at the upper protruding portion 218 a of the holding tube 218th

The device for detecting the installation failure or the installation failure of the filter device 216 according to this embodiment is arranged as described above. In the state that the filter device 216 is arranged in the sheathing body 211 , as shown in the drawing, the valve 255 performs the function of the second check valve 212 d of the hand pump 215 . Therefore, there is no problem. Generally, it is necessary to remove the air from the fuel passage after the filter device 216 is replaced. However, the removal of the air from the fuel channel cannot be carried out in the case that the filter device 216 is not arranged in the casing body 211 . Even if the hand pump 215 is operated to discharge the air after performing the filtering device 216 replacement operation, the air in the fuel passage cannot be pushed out due to the lack of the second check valve 212 d of the hand pump 215 . As a result, it is difficult to discharge the air.

In particular, according to this embodiment, the number increases of the parts not compared to the conventional one Contraption. Production costs cannot be reduced.

Tenth embodiment

Fig. 28 shows another type of installation failure detection valve of the filter device according to a tenth embodiment of the present invention, which is applicable to a diesel filter, which differs from those of the seventh to ninth embodiments in that the fuel passage is not located in the center of the filter device and the fuel flows into the filter element from outside.

A diesel filter 205 has a cladding for forming a housing, which consists of a cladding body 211 , which is arranged below, and a cap element 212 , which is arranged above the cladding body 211 , to close the upper opening of the cladding body 211 . The cap member 212 is removable with respect to the wrapping body 211 . The cap member 212 is a member made of resin, on which a fuel supply pipe mounting section 212 a and a fuel discharge pipe mounting section 212 b are produced. A fuel supply pipe 213 is integrally connected to the fuel supply pipe mounting portion 212 a. Similarly, a Kraftstoffaustragrohr 214 with the Kraftstoffaustragrohr- fixing portion 212 is connected integrally b.

A fastening protrusion 261 for fixedly arranging the filter device 216 and an outlet opening 212 h which is connected to the fuel discharge pipe 214 are provided on the bottom portion of the cap member 212 . An opening is provided in a lower bottom wall portion 260 of the fuel supply pipe mounting portion 212 a. The lower bottom wall portion 260 forms part of the wall of the cap member 212 . The opening provided in the lower bottom wall portion 260 of the fuel supply pipe fixing portion 212 a matches the small-diameter opening 230 a having the right-angled groove 232 of the seventh embodiment, as shown in FIGS. 20 to 24. A valve, which corresponds to the valve 235 of the seventh embodiment shown in FIGS. 20, 21 and 23, is inserted into and arranged in the opening. The valve 235 opens the opening in the state that the filter device 216 is arranged in the casing body 211 , but closes the opening due to its weight in the state that the filter device 216 is not arranged in the casing body 211 . Details of the opening 230 a with a small diameter with the rectangular groove 232 and the valve 235 have already been described in the seventh embodiment with reference to FIGS. 19 to 23 and will not be explained again here.

The filter device 216 is arranged on a holding element 262 and arranged under the holding element 262 . The filter device 216 has a filter element 217 which is made of paper or the like. The holding member 262 has a mounting tube 263 formed on the upper surface thereof. The fastening tube 263 is offset to one side and in operative relation with the fastening projection 261 of the cap element 212 . A pressing member formed by a protruding body 264 is also formed on the upper surface of the holding member 262 . The protruding body 264 extends parallel to the fastening tube 263 . The projecting body 264 , which corresponds to the projecting body 252 of the eighth embodiment, is a rod element which is formed in one piece with the holding element 262 . The protruding body 264 is arranged directly under the valve 235 in the state that the filter device 216 is arranged in the covering body 211 . The filter element 217 is connected to the lower surface of the holding element 262 by means of an adhesive.

The wrapping body 211 is a resin-made container with an open top. A thread 211 a is generated on an outer periphery of an upper end portion of the wrapping body 211 . Regarding the connection of the cap member 212 , the filter device 216 is prepared first. The prepared filter device 216 has the filter element 217 , which is connected to the lower end surface of the holding element 262 by means of an adhesive. Then, the fixing tube 263 formed on the upper surface of the holding member 262 is connected to the fixing protrusion 261 formed on the bottom of the cap member 212 . The filter device 216 is then received in the wrapping body 211 . The sheathing body 211 and the cap element 212 are integral with the fastening element 223 and are hermetically tightened thereon. When the filter device 216 is replaced, the above-mentioned elements are disassembled in the reverse order.

According to this embodiment, the protrusion body 264 serving as the pressing member is disposed on the upper surface of the holding member 262 . The protrusion body 264 , which is disposed on the upper surface of the holding member 262 , moves the valve 235 , which is disposed on the bottom wall portion 260 of the cap member 212 , to an open position in the state that the filter device 216 is disposed on the cap member 212 and the cap element 212 is firmly tightened on the sheathing body 211 . The fuel, which is introduced from the fuel supply pipe 213 via the opening 230 a with a small diameter into the interior of the cap element 212 , enters the casing body 211 . Then, the fuel enters the filter element 217 from the outer periphery of the filter element 217 and passes through the filter element 217 to remove foreign matters. The filtered fuel is discharged to the fuel discharge pipe 214 via the attachment pipe 263 .

The above-described valve 235 and the protruding body 264 serving as the pressing member 250 cooperatively form a device for detecting the installation failure or installation failure of the filter device 216 according to this embodiment. In the event that the assembly process is carried out with the filter device 216 arranged on the cap element 212 and properly arranged in the sheathing body 211 , the valve 235 is spaced from the opening 230 a with a small diameter, as shown in the drawing. Therefore, the fuel can flow through the opening 230 a in the usual way.

However, in the event that the assembly process is performed without placing a new filter device 216 in position due to a neglect or failure, the valve 235 will drop due to its weight, as shown in FIG. 20. The valve 235 closes the opening 230 a with a small diameter. When the internal combustion engine starts operating in this state, a negative pressure occurs on the downstream side of the valve 235 . The valve 235 is pressed vigorously to the upper surface defining the small diameter opening 230a . The fuel supply is completely interrupted. The internal combustion engine is then unable to work from the start or stop, even if it initiates the operation. Accordingly, a person in charge of replacing the filter device can immediately recognize its failure or failure in the filter device installation process.

Eleventh embodiment

Fig. 29 shows another kind of the installation failure detection valve of the filter device according to an eleventh embodiment of the present invention, which is applicable to a diesel filter which is similar to that of the tenth embodiment but differs in the arrangement position of the pressing member.

A diesel filter 205 has a cladding for forming a housing, which consists of a cladding body 211 , which is arranged below, and a cap element 212 , which is arranged above the cladding body 211 , to close the upper opening of the cladding body 211 . The cap member 212 is removable with respect to the wrapping body 211 . The cap member 212 is a member made of resin, on which a fuel supply pipe mounting section 212 a and a fuel discharge pipe mounting section 212 b are produced. A fuel supply pipe 213 is integrally connected to the fuel supply pipe mounting portion 212 a. Similarly, a Kraftstoffaustragrohr 214 with the Kraftstoffaustragrohr- fixing portion 212 is connected integrally b.

A fastening protrusion 261 for fixedly arranging the filter device 216 and an outlet opening 212 h which is connected to the fuel discharge pipe 214 are provided on the bottom portion of the cap member 212 . An opening is provided in a lower bottom wall portion 260 of the fuel supply pipe mounting portion 212 a. The lower bottom wall portion 260 forms part of the wall of the cap member 212 . The opening provided in the lower bottom wall portion 260 of the fuel supply pipe fixing portion 212 a matches the small-diameter opening 230 a having the right-angled groove 232 of the seventh embodiment, as shown in FIGS. 20 to 22. A valve, which corresponds to the valve 235 of the seventh embodiment shown in FIGS. 20, 21 and 23, is inserted into and arranged in the opening. The valve 235 opens the opening in the state that the filter device 216 is arranged in the casing body 211 , but closes the opening due to its weight in the state that the filter device 216 is not arranged in the casing body 211 .

Details of the opening 230 a with a small diameter with the rectangular groove 232 and the valve 235 have already been described in the seventh embodiment with reference to FIGS. 19 to 23 and will not be explained again here.

The filter device 216 is arranged on a holding element 262 and arranged under the holding element 262 . The filter device 216 has a filter element 217 which is made of paper or the like. The holding member 262 has a mounting tube 263 formed on the upper surface thereof. The fastening tube 263 is offset to one side and in operative relation with the fastening projection 261 of the cap element 212 . A pressing element, which is formed by a supporting body 270 and a projecting body 271 , is also produced on the lateral surface of the fastening tube 263 . The filter element 217 is connected to the lower surface of the holding element 262 by means of an adhesive.

The support body 270 and the protrusion body 271 , which are formed on the side surface of the mounting tube 263 , will be explained later. The support body 270 is a horizontally extending rod element. The projecting body 271 is a vertically extending rod element. The support body 270 and the projecting body 271 are formed in one piece. The support body 270 and the protrusion body 271 are the same in shape and function as the support body 251 and the protrusion body 252 , as shown in FIGS . 24 to 26A. The protruding body 271 is arranged directly under the valve 235 in the state that the filter device 216 is arranged in the covering body 211 .

The wrapping body 211 is a resin-made container with an open top. A thread 211 a is generated on an outer periphery of an upper end portion of the wrapping body 211 . Regarding the connection of the cap member 212 , the filter device 216 is prepared first. The prepared filter device 216 has the filter element 217 , which is connected to the lower end surface of the holding element 262 by means of an adhesive. Then, the fixing tube 263 formed on the upper surface of the holding member 262 is connected to the fixing protrusion 261 formed on the bottom of the cap member 212 . The filter device 216 is then received in the wrapping body 211 . The sheathing body 211 and the cap element 212 are integral with the fastening element 223 and are hermetically tightened thereon. When the filter device 216 is replaced, the above-mentioned elements are disassembled in the reverse order.

According to this embodiment, the support body 270 and the protrusion body 271 serving as the pressing member are arranged on the side surface of the mounting tube 263 . The protrusion body 271 , which is disposed on the side surface of the mounting tube 263 , shifts the valve 235 , which is disposed on the bottom wall portion 260 of the cap member 212 , to an open position in which the filter device 216 is disposed on the cap member 212 , and the cap element 212 is firmly tightened on the sheathing body 211 . The fuel, which is introduced from the fuel supply pipe 213 via the opening 230 a with a small diameter into the interior of the cap element 212 , enters the casing body 211 . Then, the fuel enters the filter element 217 from the outer periphery of the filter element 217 and passes through the filter element 217 to remove foreign matters. The filtered fuel is discharged to the fuel discharge pipe 214 via the attachment pipe 263 .

The above-described valve 235 and the support body 270 and the protrusion body 271 serving as the pressing member 250 cooperatively form a device for detecting the installation failure or installation error of the filter device 216 according to this embodiment. In the event that the assembly process is completed, the filter device 216 being arranged on the cap element 212 and properly arranged in the wrapping body 211 , the valve 235 is spaced from the opening 230 a with a small diameter, as shown in the drawing. Therefore, the fuel can flow through the opening 230 a in the usual way.

However, in the event that the assembly process is performed without placing a new filter device 216 in position due to a neglect or failure, the valve 235 will drop due to its weight, as shown in FIG. 20. The valve 235 closes the opening 230 a with a small diameter. When the internal combustion engine starts operating in this state, a negative pressure occurs on the downstream side of the valve 235 . The valve 235 is pressed vigorously to the upper surface defining the small diameter opening 230a . The fuel supply is completely interrupted. The internal combustion engine is then unable to work from the start or stop, even if it initiates the operation. Accordingly, a person in charge of replacing the filter device can immediately recognize its failure or failure in the filter device installation process.

The present invention is not based on the above described embodiments are limited, rather Modifications and changes to the subject of the invention possible, which, however, are to be regarded as falling within the scope of the invention are. For example, the Installation failure detection device of the filter device by a combination of one Sensor that the presence of the filter device in the Envelope body detected, and an electromagnetic Valve that controls the fuel channel in response to the signal this sensor opens or closes.

As is clear from the above description according to the preferred embodiments of the present Invention the device for preventing the supply of Fuel in the state that no filter device in the wrapping of a fuel filter or one Diesel filter is included. This device is made by a Valve and a pressing element formed. The device reliably prevents unfiltered fuel in the Case is fed into the internal combustion engine that the Filter device due to negligence during the Replacement process or even when the filter device intentionally removed from the diesel filter or fuel filter is not in the fuel filter or the diesel filter is arranged. This makes it possible to prevent the Internal combustion engine due to the unfiltered fuel is damaged. Furthermore, this device can by a simple valve can be formed. The costs are increasing not so much. Furthermore, the one described above Construction on conventional diesel filters or fuel filters applicable, with no extensive modifications to the structure required are.

Furthermore, according to the diesel filter, that with a hand pump is equipped, the device described above easily realized by the arrangement position of the second check valve compared to a conventional one Position to the filter device is changed. Farther production costs can be reduced.

Although the invention is currently referring to FIG preferred embodiments has been described, it is not limited to the details set out, but rather are modifications and changes to the subject of the invention possible, however, as falling within the scope of the invention are to be seen.

A fuel supply system has a diesel filter ( 5 ) with a housing element ( 11 ) that defines an outer wall and a filter device ( 16 ) that is accommodated in the housing element for filtering fuel, and a displacement detection sensor ( 40 ) that is located on an outflow side the filter device is arranged. A detection pressure of the displacement detection sensor ( 40 ) is set to a predetermined level which is higher than an initial pressure level which is measurable when the diesel filter ( 5 ) is in a new state and lower than a displacement pressure level which is measurable when due to the displacement no fuel is supplied to the filter device ( 16 ).

Claims (21)

1. A fuel delivery system comprising: a filter device for filtering fuel with a housing element that defines an outer wall and a filter device that is accommodated in the housing element, and a displacement detection device which is arranged on a downstream side of the filter device in order to detect the displacement of the filter device. 2. The fuel delivery system of claim 1, wherein a Detection pressure of the displacement detection device to one predetermined range is set, which is higher than a Initial pressure level is measurable when the filter device is in new condition, and lower than one Dislocation detection pressure level that is measurable when due to the No fuel is supplied to the filter device becomes. 3. Fuel supply system according to claim 1 or claim 2, further comprising an operation release device to to allow the displacement detection device only is operational when the temperature of the fuel is higher than a predetermined temperature level. 4. The fuel delivery system according to claim 3, wherein the predetermined temperature level higher than one Wax separation temperature is at which the fuel deposits wax. 5. The fuel delivery system according to claim 3, wherein the Operating release device is a bimetallic valve. 6. Fuel supply system according to one of claims 3 to 5, wherein the displacement detection device and the Operating release device integrally formed with each other are. 7. The fuel delivery system according to claim 6, wherein a Displacement detection device and assembly Operating release device on the housing element in one piece is arranged. 8. The fuel delivery system according to claim 6, wherein a Displacement detection device and assembly Operation release device independent of the housing element is arranged. 9. Fuel supply system according to one of claims 3 to 5, wherein the displacement detection device and the Operating release device are arranged separately. 10. The fuel delivery system of claim 9, wherein the Operating release device arranged on the housing element is. 11. The fuel delivery system of claim 1, wherein the Filter device is a diesel filter, which is an envelope for Forming a housing, a cap member that an opening of the casing is arranged, one Filter section, which is included in the casing and a Filter device has to remove foreign matter in the Fuel is included by filtering to remove one Water storage section, which is generated in the enclosure to To store water that has been separated from the fuel the filter section and the water storage section are designed as separate components. 12. The fuel delivery system of claim 11, wherein a Opening of the filter section through a cover element is closed when the water storage section by the Cover element is replaced. 13. The fuel delivery system of claim 11, wherein a Opening of the water storage section through a cap element is closed when the filter section through the Cap element is replaced. 14. Fuel supply system according to one of claims 11 to 13, the filter device with respect to the wrapper is removable from above and a sealing element only on one Upper portion of the filter device is arranged. 15. The fuel delivery system of claim 1, wherein the Filter device is a fuel filter that has an envelope for Forming a housing, a Fuel supply channel for supplying fuel into the envelope, one Filter device, which in the casing for filtering in foreign matter contained in the fuel, and a fuel discharge channel for discharging pure Fuel that is filtered by the filter device that is set up, a fuel filter of the filter device Training replacement design, one Restraint device is arranged to supply the fuel to prevent in the wrapper when the filter device is not arranged in the envelope. 16. The fuel delivery system of claim 15, wherein the Preventing device a valve and a pressing element has and the pressing element opens the valve when the Filter device is included in the envelope. 17. The fuel delivery system of claim 16, wherein the Filter device is removable from the casing, the Filter device has a mounting tube that as a Serves fuel channel, and a filter element for filtering the Fuel, and the pressing member a front end of the Mounting tube is. 18. The fuel delivery system of claim 16, wherein the Filter device is removable from the casing, the Filter device has a mounting tube that as a Serves fuel channel, and a filter element for filtering the Fuel, and the pressing member at a front end of the Mounting tube is generated. 19. The fuel delivery system of claim 16, wherein the Filter device is removable from the envelope, the Filter device has a mounting tube that as a Serves fuel channel, and a filter element for filtering the Fuel and the pressure element on an outer Surface of the mounting tube is generated. 20. The fuel delivery system of claim 16, wherein the Filter device a filter element for filtering the Fuel and a holding element for holding the filter element has and the pressing element generated on the holding element is. 21. The fuel delivery system of claim 1, wherein Filter device is a diesel filter, which is an envelope for Forming a housing, a fuel supply channel for feeding fuel into the wrapper, a Hand pump, a first check valve that is on an inflow side the hand pump is arranged, a second check valve, which is arranged on an outflow side of the hand pump, a filter device which is accommodated in the casing, to filter foreign matter contained in the fuel are, and a fuel discharge channel for discharging pure fuel that is filtered by the filter device is set up, a filter device- Train replacement design of the diesel filter, wherein the second check valve in the filter device is arranged.