JP2018119419A - Fuel filter device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel filter device in a simple configuration for, when a filter is clogged, performing valve opening.SOLUTION: A fuel filter device 30 has an inflow space 35 formed between the end on the other side L2 of a valve element 32 and the inner wall of a storage space 31b to allow fuel to flow therein in the state that the valve element 32 is energized by a spring 34. A passage from an inflow port 31a to the inflow space 35 is provided with a first gap 41 narrower than a filter space of a filter part 33. When the filter part 33 is clogged, the fuel flows via the first gap 41 wider than a second gap 42 into the inflow space 35. Then, the pressure of fuel in the inflow space 35 works on a pressure receiving part 51 of the valve element 32 to displace the valve element 32 to one side L1 while resisting the energization of the spring 34. As a result, between the inner wall of the storage space 31b and the end on the other side L2 of the valve element 32, a bypass flow path 43 is formed having a flow path cross section V2 larger than a flow path cross section V1 of the first gap 41.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a fuel filter device that is disposed in a fuel flow path and captures foreign matters mixed in fuel.

  A conventional fuel supply pump is provided in a fuel injection device of an internal combustion engine, pumps fuel from a fuel tank, and sends the fuel to the fuel injection device at a predetermined pressure. When foreign matter such as dust is mixed in the fuel tank, it is not preferable that the foreign matter is sent to the fuel injection device. Therefore, a fuel filter that captures foreign matters is provided at the inlet of the fuel supply pump.

  However, if fuel containing a large amount of foreign matter is mistakenly supplied to the fuel tank or the wax contained in the fuel solidifies during cold weather, the fuel filter may suddenly become clogged. . When the fuel filter is clogged, the amount of fuel necessary for combustion cannot be pumped up by the fuel supply pump, and the internal combustion engine stops.

  Therefore, Patent Document 1 discloses a fuel filter unit having a valve mechanism for temporarily preventing the internal combustion engine from stopping even when the fuel filter is clogged. Specifically, when the fuel filter is clogged, the supply of fuel is permitted by a path that opens the valve mechanism and bypasses the fuel filter.

JP2015-117615A

  In the fuel filter unit described in Patent Document 1, a valve mechanism is provided inside the fuel filter. Since the valve mechanism is provided in a small installation space inside the fuel filter, the configuration is complicated and the number of parts is increased.

  Accordingly, the present invention has been made in view of the above-described problems, and an object thereof is to provide a fuel filter device that opens with a simple configuration when the filter is clogged.

  The present invention employs the following technical means in order to achieve the aforementioned object.

The present invention is a fuel filter device (30) that is disposed in a fuel flow path and captures foreign matter mixed in fuel,
The contact portion (32a) blocks the flow of fuel from the inlet (31a) to the other side when the valve body (32) contacts,
On the other side, a first gap (41) in which the valve body can be displaced is provided between the inner wall of the housing space (31b) and the side wall of the valve body,
On one side, the inner wall of the accommodating space and the side wall of the valve body are in contact with each other, or a second gap (42) is provided between these walls,
An inflow space (35) into which fuel can flow is formed between the other end of the valve body and the inner wall of the accommodating space when the valve body is in contact with the contact portion.
The other side of the valve body has a pressure receiving portion (51) on which the pressure of the fuel flowing into the inflow space acts,
When the pressure of fuel acts on the pressure receiving part and the valve body is displaced to one side against the bias of the spring, the contact part is separated from the inner wall surface of the housing space, and the inner wall of the housing space and the valve In the fuel filter device, a bypass channel (43) is formed between the other end of the body and the fuel passing through the bypass channel flows into the valve body from the other side of the valve body and reaches the outlet. is there.

  According to the present invention as described above, the valve body is formed with an inflow space in which the flow of fuel is blocked when the contact portion comes into contact and into which fuel can flow when the contact portion is separated. The path from the inflow port to the inflow space is provided with a first gap in which the valve body can be displaced. Until the filter section is clogged, the filter section is preferentially flowed down, flows inside the valve body to one side, and flows out from the outlet. However, when the filter portion is clogged, fuel flows into the inflow space through the first gap. Then, the pressure of the fuel in the inflow space acts on the pressure receiving portion of the valve body, and the valve body is displaced to one side against the bias of the spring. A bypass channel having a channel cross-sectional area larger than the first gap is formed between the inner wall of the housing space and the contact portion on the other side of the valve body. As a result, the fuel flows from the inlet to the inside of the valve body from the other side of the valve body through the bypass flow path, and reaches the outlet. Therefore, even if the filter part is clogged, the bypass flow path that bypasses the filter part is formed by the displacement of the valve body, so that it is possible to prevent the fuel flow from stopping. Thus, since the valve body itself provided with the filter portion is displaced, the configuration can be simplified and the number of parts can be reduced as compared with the configuration in which the valve mechanism is provided separately from the filter portion.

  In addition, the code | symbol in the bracket | parenthesis of each above-mentioned means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

The system figure which shows a fuel-injection apparatus. Sectional drawing which shows a fuel filter apparatus. Sectional drawing which shows a main-body part and a fastening member. Sectional drawing which shows a fastening member and an attaching part. The figure which shows a valve body and a filter part. The figure which shows operation | movement of a valve body. The figure which expands a part of fuel filter device and shows operation of a valve element. Sectional drawing which shows the fuel filter apparatus of 2nd Embodiment. Sectional drawing which shows the fuel filter apparatus of 3rd Embodiment. Sectional drawing which shows operation | movement of the fuel filter apparatus of 4th Embodiment. Sectional drawing which shows the fuel filter apparatus of 5th Embodiment. The figure which shows the sub filter part of 6th Embodiment. Sectional drawing which shows the fuel filter apparatus of 7th Embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described using a plurality of embodiments with reference to the drawings. In some embodiments, portions corresponding to the matters described in the preceding embodiments may be given the same reference numerals, or one letter may be added to the preceding reference numerals, and overlapping descriptions may be omitted. In addition, when a part of the configuration is described in each embodiment, the other parts of the configuration are the same as those of the embodiment described in advance. In addition to the combination of parts specifically described in each embodiment, the embodiments may be partially combined as long as the combination does not hinder the combination.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the fuel injection device is a system that injects fuel into each cylinder of an engine (not shown), and includes a common rail 1, an injector 2, a supply pump 3, an ECU 4, an EDU 5, and the like.

  The common rail 1 is a pressure accumulating container that stores high-pressure fuel supplied to the injector 2 in a pressure accumulating chamber. The common rail 1 is connected to a discharge port of a supply pump 3 that pumps high-pressure fuel through a high-pressure pump pipe 6 so that a common rail pressure corresponding to the fuel injection pressure is accumulated. The common rail 1 is connected to a plurality of injector pipes 7 for supplying high-pressure fuel to the injectors 2.

  A flow damper 20 is provided at a connection portion between the common rail 1 and the injector pipe 7. The flow damper 20 has a function of closing the fuel passage from the common rail 1 to the injector 2 when the flow rate of fuel flowing from the common rail 1 to the injector 2 abnormally increases.

  A pressure limiter 10 is attached to a relief pipe 9 that returns fuel from the common rail 1 to the fuel tank 8. The pressure limiter 10 is a pressure safety valve, and is opened when the common rail pressure exceeds the limit set pressure, and suppresses the common rail pressure below the limit set pressure. A pressure reducing valve 11 is attached to the common rail 1. The pressure reducing valve 11 is opened by a valve opening instruction signal given from the ECU 4 and rapidly reduces the common rail pressure via the relief pipe 9. Thus, by mounting the pressure reducing valve 11 on the common rail 1, the ECU 4 can quickly control the common rail pressure to a pressure corresponding to the vehicle running state.

  The injector 2 is mounted in each cylinder of the engine and supplies fuel into each cylinder. The injector 2 is connected to the downstream ends of a plurality of injector pipes 7 branched from the common rail 1. The injector 2 is equipped with a fuel injection nozzle that injects high-pressure fuel accumulated in the common rail 1 into each cylinder, and an electromagnetic valve that performs lift control of a needle accommodated in the fuel injection nozzle. The leaked fuel from the injector 2 is also returned to the fuel tank 8 through the relief pipe 9.

  The supply pump 3 is a high-pressure fuel pump that pumps high-pressure fuel to the common rail 1. The supply pump 3 is equipped with a feed pump that sucks the fuel in the fuel tank 8 into the supply pump 3 via the prefilter 12. The supply pump 3 compresses the fuel sucked up by the feed pump to a high pressure and pumps the fuel to the common rail 1. The feed pump and the supply pump 3 are driven by a common cam shaft 13. The camshaft 13 is rotationally driven by the engine.

  The supply pump 3 is equipped with an SCV (suction metering valve) 14 for adjusting the degree of opening of the fuel flow path in the fuel flow path that guides the fuel into the pressurizing chamber that pressurizes the fuel to a high pressure. . The SCV 14 is a valve that adjusts the amount of fuel sucked into the pressurizing chamber and changes the amount of fuel discharged to the common rail 1 by being controlled by a pump drive signal from the ECU 4. The SCV 14 adjusts the common rail pressure by adjusting the discharge amount of fuel pumped to the common rail 1. Accordingly, the ECU 4 controls the SCV 14 to control the common rail pressure to a pressure corresponding to the vehicle running state.

  The supply pump 3 is provided with a main filter 16 in a fuel flow path that guides the fuel into a pressurizing chamber that pressurizes the fuel to a high pressure. The main filter 16 captures foreign matters contained in the fuel sucked up by the feed pump.

  The ECU 4 executes a program stored in the storage medium and controls each part. The ECU 4 includes at least one arithmetic processing unit (CPU) and a storage medium that stores programs and data. The control device is realized by, for example, a microcomputer provided with a computer-readable storage medium. The storage medium is a non-transitional physical storage medium that stores a computer-readable program and data in a non-temporary manner. The storage medium is realized by a semiconductor memory or a magnetic disk. Various arithmetic processes are performed based on signals of sensors read into the ECU 4, for example, signals according to engine parameters, occupant operating conditions, engine operating conditions, and the like. In addition to the rail pressure sensor 15 that detects the common rail pressure, the ECU 4 includes an accelerator sensor that detects the accelerator opening degree, an engine speed sensor that detects the engine speed, and engine cooling as means for detecting the operating state and the like. Sensors such as a water temperature sensor for detecting the water temperature are connected.

  An example of a specific calculation in the ECU 4 will be described. The ECU 4 performs control of an injector control system that performs drive control of the injector 2 and a rail pressure control system that performs drive control of the SCV 14. The injector control system calculates the injection mode, the target injection amount, and the injection start timing on the basis of the program stored in the ROM and the sensors signals read into the RAM for each fuel injection, and opens the injector valve Calculate the signal. The rail pressure control system calculates the target rail pressure based on the program stored in the ROM and the sensor signals read into the RAM, and the actual rail pressure calculated from the rail pressure sensor 15 is calculated as the target rail pressure. An SCV drive signal for matching with is calculated.

  The EDU 5 includes an injector drive circuit that provides a valve opening drive current to the solenoid valve of the injector 2 based on an injector valve open signal provided from the ECU 4, and a pump drive circuit that provides a drive current value to the SCV 14 based on the SCV drive provided from the ECU 4. With. The EDU 5 may be mounted in the same case as the ECU 4.

  The supply pump 3 includes a fuel filter device 30. The fuel filter device 30 is a device that captures foreign matters mixed in the fuel before being pumped to the common rail 1. As shown in FIG. 1, the fuel filter device 30 is arranged in a fuel flow path with a banjo fit.

  The banjo includes an eyeball portion that is bolted to the main body portion 31 of the fuel filter device 30, a socket portion that is fastened and fixed to an end portion of the fuel pipe, and a pipe portion that connects the eyeball portion and the socket portion. Is done. The eyeball portion has an insertion hole through which the main body portion 31 passes, and the pipe portion is integrally connected so as to extend in a direction perpendicular to the axial direction of the insertion hole. The pipe portion is formed in a hollow shape, and the eyeball portion is formed with a connection hole that communicates with the hollow portion of the pipe portion and opens in the inner wall of the insertion hole.

  The main body 31 of the fuel filter device 30 is called a banjo bolt in which an external appearance is a bolt shape and an inflow port 31a through which fuel passes is formed. When the main part of the banjo is fixed by the main body part 31, the connection hole formed in the main part of the banjo is communicated with the inlet 31 a of the main body part 31.

  As shown in FIG. 2, the fuel filter device 30 includes a main body portion 31, a valve body 32, a filter portion 33, and a spring 34. As shown in FIG. 3, the main body 31 is formed in a cylindrical shape having one end opened and the other end closed. A housing space 31 b extending in the axial direction L is formed inside the main body 31. Further, a plurality of inflow ports 31 a penetrating the outer wall, that is, four in this embodiment, are formed on the outer wall of the main body 31. The four inflow ports 31a are formed at positions that divide the circumferential direction into four equal parts, in other words, every 90 degrees. The fuel flows in a direction crossing the axial direction L and flows into the accommodation space 31b from the inflow port 31a. In this embodiment, the inflow port 31a penetrates the outer wall so as to extend in the radial direction orthogonal to the axial direction L.

  One end of the main body 31 is open, and this opening is an outlet 31c through which fuel flows out of the accommodation space 31b. A mounting portion 31 d on which the spring 34 is mounted is fixed to one end side of the main body portion 31. The placement portion 31d is an annular member and has a step on the inside. The step portion is a portion on which the spring 34 is placed. Further, the surface portion on the other side L2 in the axial direction L of the placement portion 31d serves as a portion that restricts displacement of the valve body 32 toward the one side L1 in the axial direction L. The other end of the accommodation space 31b is closed. The other end of the accommodation space 31b forms an abutment surface 31e on the inner wall with which the other end of the valve body 32 abuts.

  The valve body 32 is cylindrical and is made of, for example, resin. As shown in FIG. 5, the valve body 32 is provided in the housing space 31 b so as to be displaceable in the axial direction L. Therefore, the dimension of the valve body 32 in the axial direction L is smaller than the dimension of the accommodating space 31b in the axial direction L. Both end portions of the valve body 32 are formed to protrude outward in the radial direction. Therefore, the side wall of the intermediate part of the valve body 32 is located on the inner side in the radial direction than the side walls of both ends. Both end portions of the valve body 32 are close to the inner wall of the accommodation space 31b.

  A portion that protrudes in the radial direction on the other side L2 of the valve body 32 in the axial direction L is referred to as a pressure receiving portion 51. In addition, a portion protruding in the radial direction on one side L1 of the valve body 32 in the axial direction L is referred to as a seal portion 52. An inflow space 35 is formed between the pressure receiving portion 51 and the inner wall of the accommodation space 31b. When only the urging force of the spring 34 is acting on the valve body 32, the end portion on the other side L2 contacts the contact surface 31e of the accommodation space 31b. A portion of the valve body 32 that contacts the contact surface 31e is referred to as a contact portion 32a. The contact portion 32 a is a part of the pressure receiving portion 51. Therefore, the inflow space 35 is located between the end portion on the other side L2 of the valve body 32 and the inner wall of the accommodation space 31b in the state shown in FIG. 2 where the contact portion 32a is in contact with the contact surface 31e. Is formed.

  An opening 32 c that communicates with the inside of the valve body 32 is formed on the surface portion of the pressure receiving portion 51 on the other side L <b> 2 in the axial direction L. Therefore, the inflow space 35 and the inside of the valve body 32 communicate with each other. The area of the pressure receiving portion 51 on the other side L2 in the axial direction L is A2, and the area of the pressure receiving portion 51 on the one side L1 in the axial direction L is A1. Here, the area A1 is an area on which the pressure acts and is an area projected in the axial direction L. The area of the other side L2 of the seat portion in the axial direction L is equal to the area of the one side L1 of the pressure receiving portion 51 in the axial direction L at A1. Further, the area of one side L1 in the axial direction L of the sheet portion is A3. In the present embodiment, the relationship is A1 <A2 <A3.

  The filter portion 33 is formed by winding a flat plate-like member formed in a mesh shape into a cylindrical shape, and both ends thereof are opened. The filter unit 33 captures foreign matter at the mesh portion and allows only fuel to pass through. The filter unit 33 is fixed inside the valve body 32. As a result, the filter unit 33 captures foreign matter in the fuel that passes through the through hole 32d in the side wall of the valve body 32. When the valve body 32 is displaced, the integral filter portion 33 is also displaced. The mesh size of the filter unit 33 is, for example, 77 μm. The mesh part of the filter part 33 is a filter hole.

  The spring 34 is provided in the accommodation space 31b and biases the valve body 32 toward the other side L2 in the axial direction L (left side in FIG. 2). The spring 34 is formed of, for example, a coil spring. One end of the spring 34 is attached to the mounting portion 31 d on one side L <b> 1 in the axial direction L of the main body portion 31, and the other end is attached to the valve body 32. The spring 34 always urges the valve body 32 to the other side L2 in the axial direction L due to its own elastic force.

  As shown in FIGS. 3 and 4, the fuel filter device 30 is fixed to the fuel flow path of the supply pump 3 by a fastening member 36. The fastening member 36 is an annular member and has a step on the outside. Therefore, the fastening member 36 has a two-stage cylindrical shape. An internal thread 36 a is formed inside the fastening member 36. Further, on the outside of the main body 31, a male screw 37 that is screwed into the female screw 36a of the fastening member 36 is formed. Therefore, as shown in FIG. 3, the one end side in the axial direction L of the main body 31 is inserted into the fastening member 36 and screwed to fix the main body 31 and the fastening member 36.

  Further, the mounting portion 38 of the supply pump 3 has a mounting hole 38a as shown in FIG. A female screw 38c is formed inside the mounting hole 38a. On the outside of the fastening member 36, a male screw 36b that is screwed into the female screw 38c of the mounting hole 38a is formed. Therefore, as shown in FIG. 4, the one end side in the axial direction L of the fastening member 36 is inserted into the attachment hole 38 a and screwed to fix the fastening member 36 and the attachment hole 38 a. As a result, the main body 31 is fixed to the mounting hole 38 a, so that the fuel filter device 30 is fixed to the supply pump 3.

  Next, the operation of the valve body 32 will be described. At the end portion on the other side L2 in the axial direction L of the valve body 32 (the left end portion in FIG. 2), the inner wall of the accommodating space 31b and the side wall of the valve body 32 are more than the filter interval of the filter portion 33, for example, 77 μm. A narrow first gap 41 is provided. Further, at the end portion on the one side L1 in the axial direction L of the valve body 32 (the end portion on the right side in FIG. 2), the inner wall of the accommodating space 31b and the side wall of the valve body 32 have a first gap 41 or less. Two gaps 42 are provided. Accordingly, the second gap 42 has a gap of a size that does not allow the passage of foreign substances having a size that does not pass through the filter interval of the filter portion 33.

  As a result, as shown in FIG. 6, when the filter unit 33 is not clogged at normal times, the valve body 32 has the urging force of the spring 34 and the acting force due to the fuel pressure difference between both ends of the valve body 32. Acts on the other side L2 in the axial direction L, and is thus pressed against the other side L2 in the axial direction L. Therefore, the contact portion 32a of the valve body 32 is in contact with the contact surface 31e of the accommodation space 31b. The abutting portion 32a blocks the flow of fuel from the inlet 31a to the other side L2 in the axial direction L when the valve body 32 abuts. The fuel flowing in from the inflow port 31 a obtains the accommodation space 31 b and mainly passes through the filter portion 33 and flows into the valve body 32. Then, the inside of the valve body 32 flows to the one side L1 of the axial direction L, and flows out from the outflow port 31c to the attachment hole 38a of the attachment part 38 which is the outside. As a result, the initial foreign matter in the fuel passes through the filter unit 33, so that the foreign matter can be captured by the filter unit 33.

  More specifically, the valve opening force acting on the pressure receiving portion 51 is the product of the fuel feed pressure P1 and the area A2. The valve opening force is a force that presses the valve body 32 toward the one side L1 in the axial direction L. The valve closing force acting on the seal portion 52 is a resultant force of the product of the fuel feed pressure P1 and the area A3 and the urging force of the spring 34. The valve closing force is a force that presses the valve element 32 toward the other side L2 in the axial direction L, contrary to the valve opening force. When the valve is closed, the closing force is increased by the biasing force of the spring 34, and the valve body 32 is closed.

  However, when the filter unit 33 is clogged, it becomes impossible to pass fuel through the filter unit 33. The clogging of the filter unit 33 may occur, for example, when wax contained in the fuel adheres to the filter unit 33 when the engine is started. When the fuel wax or the like clogs the filter unit 33, the fuel cannot pass through the filter unit 33, the pressure P3 downstream of the filter unit 33 is lowered, and finally the negative pressure can be generated by the suction force of the supply pump 3. . Here, the downstream side of the filter unit 33 is synonymous with the one side L1 of the filter unit 33 in the axial direction L. The upstream side of the filter unit 33 has the same meaning as the other side L2 of the filter unit 33 in the axial direction L. Further, on the upstream side of the filter portion 33, as shown in FIG. 7, the fuel gradually enters the inflow space 35 through the first gap 41, and the fuel that resists the biasing force of the spring 34 on the upstream side. Valve opening force due to pressure is generated. Further, in FIG. 7, each member is exaggerated with wide intervals so that the flow of fuel can be easily understood.

  More specifically, the valve opening force acting on the pressure receiving portion 51 is the product of the fuel pressure P2 and the area A20 in the inflow space 35. As shown in FIG. 7, the area A <b> 20 is an area where the fuel that first passes through the first gap 41 of the flow path cross-sectional area V <b> 1 acts on the pressure receiving portion 51. The area A20 is an outer peripheral portion of the pressure receiving portion 51 and is an area of a chamfered portion. The valve closing force acting on the seal portion 52 at this time is the suction force of the supply pump 3 based on the sum of the product of the pressure P3 and the area A3, which has been reduced from atmospheric pressure to negative pressure due to fuel shortage, and the biasing force of the spring 34. The value is obtained by subtracting. Accordingly, the valve opening force exceeds the valve closing force, and the sliding displacement of the valve body 32 is started when the filter is closed.

  As shown in FIG. 6, when the valve body 32 is slid over the lift amount S <b> 1, the first gap 41 and the inflow space 35 communicate with each other, and the inflow of fuel into the inflow space 35 is started. The fuel pressure becomes the fuel feed pressure P1. As a result, the valve opening force acting on the pressure receiving portion 51 is the product of the fuel feed pressure P1 and the area A2. Further, due to a pressure drop or negative pressure generation on the downstream side of the valve body 32, the valve body 32 is slid to the downstream side against the urging force of the spring 34 by the valve opening force. When the valve is open, the fuel also flows to one side L1 of the valve body 32 in the axial direction L, but the pressure cannot be increased because the volume of the supply pump 3 is large. As a result, the clearance seal portion that is the first gap 41 becomes a main fuel path through which the fuel passes as the bypass flow path 43 having the flow path cross-sectional area V2. The channel cross-sectional area V2 of the bypass channel 43 is larger than the channel cross-sectional area V1 of the first gap 41. It is clogged whether the lift amount S1 that slides here is a position where the acting force due to the fuel pressure upstream and downstream of the valve body 32 and the biasing force of the spring 34 are balanced or until it hits the mounting portion 31d. It depends on the situation and driving conditions.

  As shown in FIG. 7, the valve body 32 slides and displaces to the one side L <b> 1 to open the bypass flow path 43, and the inflow fuel reaches the opening 32 c on the upstream side of the valve body 32. Thus, sufficient fuel passes through the inside of the valve body 32 and reaches the outlet 31c without passing through the clogged filter part 33. Then, the fuel is supplied to the pressurizing chamber of the supply pump 3 through the mounting hole 38 a of the mounting portion 38.

  In the case of clogging with fuel wax, when the time elapses, the fuel temperature rises, the fuel wax is dissolved, and when the clogging of the filter unit 33 due to wax is eliminated, the fuel passes through the filter unit 33. Then, when the fuel supply to the inflow space 35 decreases and the fuel supply to the downstream side of the valve body 32 becomes sufficient, the fuel on the one side L1 in the axial direction L of the valve body 32 moves to the other side L2 in the axial direction L. And the negative pressure due to the suction force of the supply pump 3 is eliminated. As a result, the valve body 32 returns to the origin at the valve closing position by the valve closing force exceeding the valve opening force and slidingly displaced to the other side L2 in the axial direction L by the biasing force of the spring 34. As a result, the bypass channel 43 disappears, the first gap 41 is formed again, and the normal clearance seal state is restored.

  As described above, the fuel filter device 30 according to the present embodiment blocks the flow when the contact portion 32a of the valve body 32 is in contact with the contact surface 31e of the accommodation space 31b, and the contact portion 32a is in contact with the contact portion 32a. An inflow space 35 into which fuel can flow is formed in a state separated from the contact surface 31e. A path from the inlet 31 a to the inflow space 35 is provided with a first gap 41 that is narrower than the filter interval of the filter portion 33. Therefore, since the resistance is smaller when passing through the filter part 33, the filter part 33 is preferentially flowed down until the filter part 33 is clogged, and flows through the valve body 32 to the one side L1, and the outlet 31c. Spill from. However, when the filter unit 33 is clogged, the fuel flows into the inflow space 35 through the first gap 41 that is larger than the second gap 42. Then, the pressure of the fuel in the inflow space 35 acts on the pressure receiving portion 51 of the valve body 32, and the valve body 32 is displaced to the one side L1 against the bias of the spring 34. A bypass channel 43 having a channel cross-sectional area V2 larger than the channel cross-sectional area V1 of the first gap 41 is formed between the inner wall of the accommodating space 31b and the end of the other side L2 of the valve body 32. . As a result, the fuel flows from the inflow port 31a through the bypass channel 43 to the inside of the valve body 32 from the other side L2 of the valve body 32 and reaches the outflow port 31c.

  Therefore, even if the filter part 33 is clogged, the bypass flow path 43 that bypasses the filter part 33 is formed by the displacement of the valve body 32, so that it is possible to prevent the fuel flow from stopping. Thus, since the valve body 32 provided with the filter unit 33 is displaced, the configuration can be simplified and the number of parts can be reduced as compared with the configuration in which the valve mechanism is provided separately from the filter unit 33.

  In particular, in the case of clogging with fuel wax, the wax is dissolved by the increase in fuel temperature, the clogging of the filter part 33 due to wax is also eliminated, and the original filter function can be recovered.

  Furthermore, in the present embodiment, the spring 34 is provided in the accommodation space 31b and the valve body 32 is urged toward the other side L2, so that the installation space for the spring 34 is larger than the spring 34 disposed inside the valve body 32. Can be increased. As a result, a sufficient stroke amount of the spring 34 can be ensured, and the valve element 32 can be displaced when the filter portion 33 is clogged with high reliability.

  In the present embodiment, the side wall on which the filter portion 33 is provided in the valve body 32 is located on the inner side of the side wall that forms the first gap 41 and the second gap 42. As a result, the through hole 32d of the valve body 32 can be enlarged to provide a wider area for the filter portion 33. Therefore, it can suppress by enlarging the flow-path area which passes the pressure loss at the time of the filter part 33 passage.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized in that the pressure receiving portion 512 is made of a metal such as carbon steel. Since the pressure receiving portion 512 is made of metal, the accuracy of the first gap 41 that can improve the processing accuracy more than that of the resin can be improved. Further, the wear resistance of the pressure receiving portion 512 can be improved.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized in that the seal portion 523 is made of metal, for example, carbon steel. The seal portion 523 is a portion that forms the second gap 42 in the valve body 32. Since the seal portion 523 is made of metal, the accuracy of the second gap 42 that can improve the processing accuracy more than that of the resin can be improved. In addition, the wear resistance of the seal portion 523 can be improved. The seal portion 523 is a portion that contacts the spring 34. By improving the strength of such a portion, damage to the valve body 32 can be suppressed.

  More specifically, the valve body 32 has a resin base portion and a metal seal portion 523, and the seal portion 523 is provided in an annular shape so as to surround the outer peripheral surface of the base portion. A second gap 42 is formed between the outer peripheral surface of the seal portion 523 and the inner peripheral surface of the main body portion 31. The bottom surface of the seal portion 523 that extends perpendicular to the axial direction L contacts the end of the spring 34.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized by the shape of the pressure receiving portion 514, and is characterized in that the pressure receiving portion 514 is formed in a two-stage cylindrical shape.

  The pressure receiving portion 514 has a convex portion 53 that is convex from the surface portion on the other side L2 in the axial direction L to the other side L2 in the axial direction L. An opening 32 c communicating with the inside is formed on the side wall of the convex portion 53. The inflow space 35 is provided with a reduced diameter portion 35a. The reduced diameter portion 35a is a portion obtained by partially reducing the diameter of the other axial side L2 of the inflow space 35. The reduced diameter portion 35a has a size and shape into which the convex portion 53 can be inserted. As shown in FIG. 10, the convex portion 53 is arranged in the reduced diameter portion 35 a when the valve is closed, and the tip portion of the convex portion 53 forms a part of the inflow space 35. The convex portion 53 is positioned or in contact with the reduced diameter portion 35a in a state where the contact portion 32a is in contact with the contact surface 31e. Further, the convex portion 53 is positioned or contacts in the reduced diameter portion 35a even when the displacement amount of the valve body 32 toward the one axial side L1 is maximum. As a result, when the valve body 32 is slid, the valve body 32 can be prevented from shifting in the radial direction.

  As described above, when the convex portion 53 is displaced to the one side L1 by the pressure applied to the pressure receiving portion 514, the convex portion 53 functions as a guide portion that is positioned or in contact with the reduced diameter portion 35a of the inflow space 35 to guide the displacement. Further, when the valve is opened, fuel flows into the valve body 32 from the opening 32 c formed in the side wall of the convex portion 53. As a result, the fuel can flow more smoothly into the valve body 32 than when the opening 32 c is formed at the tip of the convex portion 53.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized in that a sealing material 55 is provided on the seal portion 52. The seal material 55 is disposed in a recess 56 formed in the seal portion 52. The sealing material 55 is annular and is made of a material having slidability. The sealing material 55 is made of, for example, polytetrafluoroethylene (PTFE).

  By providing the sealing material 55, the sealing material 55 functions as a side wall of the valve body 32 and comes into contact with the inner wall of the accommodation space 31 b, so that the second gap 42 can be eliminated to prevent the fuel from flowing down. Moreover, since the sealing material 55 has sliding property, it can suppress that it becomes resistance at the time of sliding displacement.

  As a result, when the filter unit 33 is clogged, the valve body 32 can be slid and displaced more smoothly by allowing the fuel to flow into the inflow space 35 from the first gap 41. Thereby, the reliability of valve opening of the valve body 32 can be improved.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized in that a sub-filter portion 57 is provided in the opening 32c of the valve body 32 of the first embodiment. As shown in FIG. 12, the sub filter unit 57 has the same mesh portion as the filter unit 33. Since the sub filter part 57 is provided in the opening part 32c of the valve body 32, the foreign material contained in the fuel which flows into the inside of the valve body 32 from the opening part 32c at the time of valve opening is captured.

  As a result, a certain amount of initial foreign matter capturing function can be secured when the valve is opened. The mesh size of the sub filter unit 57 is selected to be coarser than the mesh size of the filter unit 33, for example. Therefore, for example, when the mesh size of the filter unit 33 is # 200 mesh, for example, the mesh size of the sub-filter unit 57 is selected as # 32 mesh or # 100 mesh.

  Therefore, even when the valve is open, large foreign matters can be captured. Further, when the valve is opened, the small foreign matter cannot be captured like the filter unit 33, but the sub filter unit 57 is small in size, and therefore can be prevented from being clogged in a short period of time.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described with reference to FIG. The present embodiment is characterized in that the opening diameter is smaller than the opening 32c of the valve body 32 of the first embodiment. As shown in FIG. 13, the opening diameter D1 is smaller than the inner diameter D2 of the portion where the filter portion 33 of the valve body 32 is disposed. The pressure receiving portion 514 has an outer diameter D3 formed in a truncated cone shape, and an opening 32c is formed at the tip thereof. In the present embodiment, the tip of the pressure receiving portion 514 functions as the contact portion 32a. As a result, the volume of the inflow space 35 is also smaller than in the first embodiment.

  The opening diameter D1 is set to a value larger than a value that can secure a flow path area necessary for idling when the engine is started, for example. By reducing the opening diameter D1, the area A2 of the pressure receiving portion 514 can be made larger than that in the first embodiment. Therefore, clogging occurs, and when the fuel passes through the first gap 41 and flows into the inflow space 35, the valve opening force acting on the valve body 32 can be increased. As a result, the valve opening performance of the valve body 32 can be improved, and the interruption of the fuel flow due to the valve not opening can be avoided.

  The maximum position where the valve body 32 slides and displaces is a position where the seat portion hits the placement portion 31d. Therefore, the displacement of the valve body 32 to the one side L1 in the axial direction L is regulated by the placement portion 31d. Even if the valve body 32 does not contact the mounting portion 31d, the valve body 32 stops at a position where the valve opening force and the valve closing force are balanced. Therefore, the amount of displacement of the valve body 32 by sliding displacement can be adjusted to some extent by the size of the opening diameter D1.

  Further, as a method of improving the valve opening performance, the valve opening performance can be improved by reducing the set load of the spring 34 and reducing the spring constant. In this case, it is necessary to set the fuel pressure, the pulsation of the fuel pressure, and the use conditions.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  The structure of the above-described embodiment is merely an example, and the scope of the present invention is not limited to the scope of these descriptions. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  In the first embodiment described above, the first gap 41 has a size that does not allow the passage of foreign matters having a size that does not pass through the mesh space that is the filter hole, but is not limited to such a size. The first gap 41 may be a gap in which the valve body 32 can be displaced, for example. Therefore, the first gap 41 may be a gap larger than the second gap 42.

  In the first embodiment described above, the banjo fit structure is used, but it is not limited to such a structure. The fuel filter device 30 may be arranged in the fuel flow path not by a connection structure such as a bolt and a nut but by another connection structure.

  In the first embodiment described above, the spring 34 is disposed outside the valve body 32, but is not limited to such a configuration. For example, one end of the spring 34 may be disposed inside the valve body 32 and the other end may be disposed outside the valve body 32.

  In the first embodiment described above, the flow path cross-sectional area V1 of the first gap 41 is set to be narrower than the filter interval of the filter unit 33, but the first gap 41 is not smaller than the intervals of all meshes. Good. For example, a part of the mesh of the filter unit 33 may be spaced smaller than the first gap 41.

  In the first embodiment described above, the valve body 32 is urged to the other side L2 by the urging force of the spring 34 and the fuel pressure, but is not limited to such a configuration. For example, the valve body 32 may be biased only by the biasing force of the spring 34. Therefore, it may be determined in consideration of fuel pressure pulsation and the like.

  In the first embodiment described above, the fuel filter device 30 is disposed in the fuel path of the supply pump 3, but is not limited to the supply pump 3. Other pumps may be used, and other devices may be used as long as the fuel flows.

  In the first embodiment described above, the filter unit 33 is housed inside the valve body 32, but is not limited to such a configuration. For example, you may arrange | position outside the valve body 32, and may arrange | position so that it may protrude and extend to the other side L2 of the axial direction L of the valve body 32. FIG. If the filter part 33 protrudes to the other side L2, when the valve body 32 is slid, the filter part 33 that is not clogged appears, so that foreign matter in the bypass channel 43 can be captured. it can.

DESCRIPTION OF SYMBOLS 30 ... Fuel filter apparatus 31 ... Main-body part 31a ... Inlet 31b ... Accommodating space 31c ... Outlet 31d ... Mounting part 32 ... Valve body 32c ... Opening part 33 ... Filter part 34 ... Spring 35 ... Inflow space 41 ... 1st clearance gap 42 ... 2nd clearance 43 ... Detour channel 51 ... Pressure receiving part 52 ... Seal part 53 ... Convex part (guide part)
55 ... Sealing material 56 ... Concave portion 57 ... Sub-filter part L ... Axial direction

Claims (10)

A fuel filter device (30) that is disposed in a fuel flow path and captures foreign matter mixed in the fuel,
A housing space (31b) extending in the axial direction (L) inside, an inflow port (31a) for flowing fuel into the housing space in a direction crossing the axial direction, and one side in the axial direction A main body (31) in which an outflow port (31c) for allowing fuel to flow into (L1) and flowing out of the accommodation space is formed;
A cylindrical valve body (32) provided in the housing space so as to be displaceable in the axial direction;
A filter portion (33) provided on a side wall of the valve body, having a filter hole and capturing foreign matter in the fuel passing through the side wall of the valve body;
The valve body is provided in the housing space, urges the valve body to the other side (L2) in the axial direction, and the contact portion (32a) at the end of the valve body is brought into contact with the inner wall (31e) of the housing space. A spring (34),
The abutting portion blocks the flow of fuel from the inflow port to the other side when the valve body abuts.
On the other side, a first gap (41) in which the valve body can be displaced is provided between the inner wall of the housing space and the side wall of the valve body,
On the one side, the inner wall of the accommodating space and the side wall of the valve body are in contact with each other, or there is a gap that does not allow the foreign matter to pass through the filter hole between the walls. A second gap (42) is provided,
An inflow space (35) into which fuel can flow is formed between the contact portion of the valve body and the inner wall of the accommodating space when the valve body contacts the contact portion,
The other side of the valve body has a pressure receiving portion (51) on which the pressure of the fuel flowing into the inflow space acts,
When the pressure of fuel acts on the pressure receiving portion and the valve body is displaced to the one side against the bias of the spring, the contact portion is separated from the inner wall surface of the accommodating space, A detour channel (43) is formed between the inner wall of the housing space and the other end of the valve body, and fuel that has passed through the detour channel flows from the other side of the valve body to the valve body. A fuel filter device that flows into the interior and reaches the outlet.   2. The fuel filter device according to claim 1, wherein the first gap has a size that does not allow the foreign matter to pass through the filter hole.   3. The fuel filter device according to claim 1, wherein the side wall on which the filter unit is provided in the valve body is located on the inner side of the side wall forming the first gap and the second gap.   The fuel filter device according to claim 1, wherein the pressure receiving portion is made of metal.   The part which forms the said 2nd clearance gap among the said valve bodies is a fuel filter apparatus as described in any one of Claims 1-4 which consists of metals.   When the valve body is displaced to the one side by the pressure applied to the pressure receiving portion, even when the displacement amount is maximum, the valve body is positioned or brought into contact with the reduced diameter portion (35a) of the inflow space to guide the displacement. The fuel filter device according to any one of claims 1 to 5, further comprising a guide portion (53) for performing the operation. A seal material (55) provided on the side wall on the one side of the valve body;
The fuel filter device according to claim 1, wherein the sealing material is in contact with an inner wall of the housing space on the one side.   The sub-filter part (57) which is provided in the edge part of the said other side of the said valve body, and further capture | acquires the foreign material in the fuel which flows in into the said valve body from the said inflow space. The fuel filter device according to one.   The fuel filter device according to any one of claims 1 to 8, wherein the valve body has a diameter (D1) of the contact portion smaller than an inner diameter (D2) of a portion where the filter portion is provided.   When the foreign matter is wax contained in the fuel, after the wax is dissolved, the valve body moves to the other side, and the contact portion contacts the inner wall of the accommodation space. The fuel filter device according to claim 1.

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