JP2013000608A - Oil filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil filter which can correctly detect the clogging of a filter medium.SOLUTION: This oil filter includes a filter element 20 which constitutes a main flow path A reaching a discharge opening 16a from an inlet opening 15a passing through the filter medium 21, when the oil filter is accommodated in a filter case 10 and which makes up a bypass flow path B reaching the discharge opening 16a without passing through the filter medium 21 from the inlet opening 15a; a valve unit 30 which releases the bypass flow path B when the upstream pressure exceeds a preset pressure level; and a proximity switch 40 which detects the release of the bypass flow path B by the valve unit 30. The valve unit 30 opens and closes the bypass flow path B by the operation of a plug 32 to come into contact with or separate from a valve seat 33e installed on a sleeve 33. The proximity switch 40 detects the movement of the plug 32, and the sleeve 33 on which the plug 32 of the valve unit 30 is arranged movably and the proximity switch 40 are supported by the filter case 10.

Description

  The present invention relates to an oil filter device.

  In a construction machine having a hydraulic actuator such as a hydraulic cylinder, the oil stored in the hydraulic oil tank is supplied to the hydraulic actuator by a hydraulic pump, and is returned to the hydraulic oil tank after the hydraulic actuator is operated. The hydraulic oil tank is provided with an oil filter device, and the oil returned from the hydraulic actuator is filtered and stored in the hydraulic oil tank. In this type of oil filter device, the filter element is accommodated in the filter case, and the oil flowing in from the inlet of the filter case is drained through the outlet until the filter medium of the filter element is discharged. The foreign matter contained in the oil is removed.

  In the oil filter device having the above-described configuration, a bypass flow path is generally provided in case the filter element of the filter element is clogged. The bypass flow path guides the oil flowing in from the inlet to the outlet as it is, and includes a valve unit. The valve unit opens and opens the bypass flow path only when the upstream pressure exceeds a preset value.

  In this oil filter device, during normal use, the oil flowing in from the inflow port passes through the filter medium and then is discharged from the discharge port, so that foreign matters are removed when passing through the filter medium. On the other hand, in a state where the filter medium is clogged, the pressure upstream of the valve unit rises, so that the bypass channel is eventually opened by the operation of the valve unit. As a result, the oil is discharged from the discharge port to the hydraulic oil tank through the bypass flow path, and the oil can be supplied also to the hydraulic actuator.

  However, the oil that passes through the bypass channel is not filtered. Accordingly, when the operation of the construction machine is continued with the bypass flow path opened, foreign matter contained in the oil may be mixed into the hydraulic circuit.

  For this reason, in the improved oil filter device, the operation of the valve unit is monitored by a detection sensor, and when the valve unit opens the bypass flow path, that is, when the filter medium is clogged, this is notified. Is provided. For example, in Patent Document 1, a permanent magnet is provided on a valve stem that supports a plug, while a detection sensor including magnetic detection means is provided on a filter case, and the displacement of the permanent magnet accompanying the operation of the valve unit is detected by the detection sensor. By doing so, clogging of the filter medium is detected. According to such an oil filter device, oil can be supplied by opening the valve unit even when the filter medium is clogged, and the supply of oil that has passed through the bypass channel is notified by notifying that the filter medium is clogged. As a result, it is possible to prevent foreign matter from entering the hydraulic circuit.

Japanese Utility Model Publication No. 64-28910

  By the way, in construction machinery, since the flow rate of oil flowing into the filter case is relatively large, the internal pressure of the filter case may change according to the inflow and outflow of oil, and the filter case may be deformed. . Such deformation of the filter case affects the detection result of the detection sensor, and even when the filter medium is not clogged, the detection sensor may erroneously output a detection signal, making accurate detection difficult. It becomes.

  In view of the above circumstances, an object of the present invention is to provide an oil filter device that can always accurately detect clogging of a filter medium.

  In order to achieve the above object, an oil filter device according to the present invention has an inflow port and a discharge port, and when a cylindrical filter element is mounted inside, an inner peripheral side and an outer peripheral side of the filter element are provided. A filter case in which a main flow path that passes through the filter medium of the filter element and a bypass flow path that does not pass through the filter medium of the filter element are formed, and in the normal state, the bypass flow path is closed, while an upstream pressure Comprises a valve unit that opens the bypass flow path when the pressure exceeds a preset pressure, and a detection sensor that detects that the valve unit has opened the bypass flow path, from the inlet to the filter case. An oil filter that filters oil by the filter medium when the inflowing oil passes through the main flow path and is discharged from the discharge port The valve unit opens and closes the bypass flow path when the plug comes in contact with the valve seat provided on the sleeve, and the detection sensor detects the movement of the plug. A sleeve in which the plug is movably arranged and the detection sensor are supported by the filter case, respectively.

  In the oil filter device described above, the sleeve of the valve unit may have an inlet port opened on a peripheral surface and an outlet port opened at a distal end portion between the filter element and the filter case. The inlet port is positioned and the outlet port is positioned in the center hole of the filter medium and is supported by the filter case. The plug of the valve unit moves to the sleeve via a valve stem. It is arranged so as to be in contact with the valve seat by a valve spring interposed between the sleeve and the detection sensor detects the movement of the plug via the valve stem. It is characterized by that.

  Further, the present invention is the above-described oil filter device, wherein the filter case includes a bottomed cylindrical case main body that houses the filter element, and a lid that closes an opening of the case main body so that the opening can be opened and closed. A spring plate that has the inflow port in the peripheral wall of the case body and the discharge port in the center of the bottom wall of the case body, and abuts the lid of the filter case and the end face of the filter element; In between, a pressing spring that supports the center hole of the filter medium at a position opened to the discharge port of the filter case is interposed, and the sleeve is provided with an oil seal on an outer peripheral portion, and the oil seal is interposed through the oil seal. It is inserted into a cylindrical hole formed in the spring plate so as to be movable, and the base end portion of the sleeve is connected to the filter case. Characterized in that is supported on the lid.

  Further, the present invention is the above-described oil filter device, wherein the sleeve has a ring member attached to the outer peripheral surface on the tip side of the cylindrical hole of the spring plate, and the lid is removed from the case body. In this case, the spring plate is supported by the ring member.

  In the oil filter device described above, when the plug is close to the lid body, the plug abuts against the distal end portion of the sleeve to close the outlet port, while the plug is separated from the lid body. The outlet port of the sleeve is opened, and the detection sensor outputs a detection signal when the distance from the valve stem exceeds a preset value.

  Further, the oil filter device according to the present invention has an inlet and an outlet, and when the cylindrical filter element is mounted inside, the filter is disposed between the inner peripheral side and the outer peripheral side of the filter element. A filter case in which a main flow path that passes through the filter medium of the element and a bypass flow path that does not pass through the filter medium of the filter element are formed; in the normal state, the bypass flow path is blocked; A valve unit that opens the bypass flow path when the pressure exceeds, and a detection sensor that detects that the valve unit has opened the bypass flow path, and the oil that has flowed into the filter case from the inlet port In an oil filter device that filters oil with the filter medium when passing through a main flow path and being discharged from the discharge port, The filter case includes a bottomed cylindrical case main body that accommodates the filter element, and a lid that closes an opening of the case main body so as to be openable and closable. The filter case includes the inflow port on a peripheral wall of the case main body. The discharge port is provided at the center of the bottom wall of the main body, and the valve unit opens and closes the bypass flow path when a plug comes in contact with a valve seat provided in a sleeve. The sleeve of the unit has an inlet port opened on the peripheral surface, an outlet port opened at the tip, and is movably inserted into the cylindrical hole of the spring plate through an oil seal attached to the outer peripheral portion. The inlet port is positioned between the filter element and the filter case, and the outlet port is located in the center hole of the filter medium; The valve unit plug is movably disposed on the sleeve via a valve stem, and is in contact with the valve seat by a valve spring interposed between the sleeve and the sleeve. And the detection sensor detects movement of the plug via the valve stem, and supports the detection sensor on the lid of the filter case, and the plug via the sleeve and the valve stem. Is supported by the lid of the filter case.

  According to the present invention, since the detection case and the sleeve on which the detection target plug is movably disposed are supported by the filter case, the deformation of the filter case affects the detection result of the detection sensor. There is no fear of affecting. Therefore, even when oil having a large flow rate or pressure flows into the filter case, it is possible to always detect clogging of the filter medium accurately without reacting erroneously.

FIG. 1 is a cross-sectional side view of an oil filter device according to an embodiment of the present invention. FIG. 2 is a sectional side view of the oil filter device shown in FIG. 1 in a state where the valve unit is operated. 3 is an exploded cross-sectional side view of the oil filter device shown in FIG. 4 is a perspective view of a sleeve applied to the oil filter device shown in FIG.

  Hereinafter, preferred embodiments of an oil filter device according to the present invention will be described in detail with reference to the accompanying drawings.

  1 to 3 show an oil filter device according to an embodiment of the present invention. The oil filter device illustrated here is not shown in the figure, but is disposed inside a hydraulic oil tank mounted on a construction machine, and after flowing in oil is filtered, it is discharged to the hydraulic oil tank. A filter case 10 is provided. The filter case 10 includes a cylindrical case main body 11 having a bottom wall 11a at the lower end, and a lid body 12 that closes the upper end opening of the case main body 11 so as to be openable and closable. The oil tank is disposed at an upper position inside the oil tank. The case body 11 is provided with a thick portion 11b at the peripheral edge of the opening, and the lid 12 is detachably attached by fastening a mounting bolt 13 to the thick portion 11b via the lid 12. . In addition, the code | symbol 14 in FIG. 1 is the oil seal member interposed between the cover body 12 and the thick part 11b.

  In addition, the case body 11 is provided with an inlet 15a and an outlet 16a. The inflow port 15a is an opening for receiving the oil returned from the hydraulic actuator, and is opened at a position that is substantially in the middle in the height direction on the peripheral wall 11c of the case body 11. The discharge port 16a is an opening for discharging the oil of the case main body 11 to the hydraulic oil tank, and is open to the center of the case main body 11 in the bottom wall 11a. The inflow pipe 15 is fitted to the inflow port 15 a of the case body 11 with the tip projecting into the inside of the case body 11, and the upper end of the case body 11 is connected to the discharge port 16 a of the case body 11. The discharge pipe 16 is fitted in a state protruding from the inside.

  A filter element 20 is accommodated in the filter case 10. The filter element 20 includes a filter medium 21 configured in a hollow cylindrical shape, and element plates 22 disposed on both end faces of the filter medium 21, and the oil passes through the filter medium 21 along the radial direction. Is filtered. The element plate 22 has a perforated disk shape having an insertion hole 22a at the center, and has annular lips 22b and 22c that bend in the same direction at the outer peripheral edge and the inner peripheral edge, respectively. Thus, the filter medium 21 is mounted on both end faces with the end of the filter medium 21 inserted between the lips 22b and 22c. The outer diameter of the element plate 22 is configured to be smaller than the inner diameter of the case body 11 in the filter case 10, and the insertion hole 22 a of the element plate 22 is fitted to the discharge pipe 16 protruding from the bottom wall 11 a of the filter case 10. It is configured to have an inner diameter that can be used. The distance between the element plates 22 is formed to be smaller than the height dimension of the case main body 11. In addition, the code | symbol 17 in FIG. 1 is a baffle plate which prevents the oil inflow from the inflow port 15a from striking the filter medium 21 of the filter element 20 directly. The baffle plate 17 has a curved shape along the inner peripheral surface of the case body 11, and is provided in the case body 11 in a manner facing the inlet 15 a at a position separated from the filter medium 21 of the filter element 20. is there.

  The lid 12 of the filter case 10 is provided with a valve unit 30 at a portion facing the bottom wall 11 a of the case body 11. In the valve unit 30, a plug 32 provided on the valve stem 31 is disposed so as to be movable with respect to the sleeve 33. The valve unit 30 is attached to the lid body 12 with the axis of the sleeve 33 aligned with the central axis of the lid body 12. It is supported.

  As shown in FIG. 4, the sleeve 33 has a cylindrical shape with an open base end. The outer diameter of the sleeve 33 is configured to be smaller than the insertion hole 22 a formed in the element plate 22. The sleeve 33 is provided with a pair of inlet ports 33a on the peripheral wall of the base end portion and a pair of outlet ports 33b at the distal end portion. The inlet port 33a is a relatively large-diameter hole opened in a cylindrical peripheral wall, and is formed at portions facing each other across the axis of the sleeve 33. The outlet port 33b is a fan-shaped hole that opens around the boss portion 33c provided at the center of the tip of the sleeve 33, and is equally divided by a pair of ribs 33d extending along the radial direction of the sleeve 33. is there. A valve seat 33e is formed around the outlet port 33b. The valve seat 33 e is a distal end surface of a cylindrical portion provided at the distal end portion of the sleeve 33 and is provided on a surface orthogonal to the axial center of the sleeve 33.

  As shown in FIGS. 1 to 3, the valve stem 31 is a long columnar member that passes through a sliding hole 33 f formed in the boss portion 33 c of the sleeve 33, and a plug 32 is provided at a portion protruding from the sleeve 33. A valve spring 34 is provided at a portion of the sleeve 33 accommodated in the cylinder.

  The plug 32 is a circular member having a size such that a portion facing the distal end surface of the sleeve 33 contacts the valve seat 33e. The plug 32 is slidably fitted into the valve stem 31 and is prevented from falling off the valve stem 31 by a stopper member 34a attached to the tip of the valve stem 31. When the plug 32 is closest to the sleeve 33, the plug 32 can contact the valve seat 33e of the sleeve 33 without any gap, and the outlet port 33b of the sleeve 33 can be closed. Reference numeral 35 in the drawing denotes a pair of oil seal rings mounted on a portion of the valve stem 31 located between the plug 32 and the boss portion 33c of the sleeve 33.

  The valve spring 34 is a coil spring wound around the valve stem 31 so as to be interposed between a spring receiver 34 b provided on the valve stem 31 and a boss portion 33 c of the sleeve 33. The valve spring 34 functions to keep the outlet port 33b of the sleeve 33 closed by bringing the plug 32 into contact with the valve seat 33e by always retracting the valve stem 31 into the cylinder of the sleeve 33.

  The valve unit 30 having the above configuration inserts the sleeve 33 into the support hole 36a formed in the support block 36 from the outside of the lid 12 so that the flange 33g provided on the outer periphery of the proximal end portion of the sleeve 33 is supported by the support block 36a. The stopper member 37 is attached to the upper end portion of the support hole 36 a by contacting the support ring wall 36 b of the support member 36, and is supported by the lid body 12 via the base end portion of the sleeve 33. The support block 36 is welded to the lid body 12, while the plug member 37 is detachably attached to the support block 36 by a bolt 38.

  The plug member 37 is provided with a proximity switch (detection sensor) 40. The proximity switch 40 is attached to the plug member 37 with the detection surface 40a at the front end facing the inside of the sleeve 33, and outputs a detection signal to a control means (not shown). More specifically, the proximity switch 40 outputs an ON signal to a control means (not shown) when the distance between the detection surface 40a and the proximal end surface of the valve stem 31 is equal to or less than a preset threshold value. When the distance between the detection surface 40a and the base end surface of the valve stem 31 exceeds a threshold value, an OFF signal is output to the control means (not shown). In this embodiment, the proximity switch 40 outputs an ON signal when the valve stem 31 is closest to the lid 12 and the plug 32 is in contact with the valve seat 33e of the sleeve 33 as shown in FIG. On the other hand, as shown in FIG. 2, when the valve stem 31 moves away from the lid 12 and the plug 32 and the valve seat 33e of the sleeve 33 are separated from each other, they are close so as to output an OFF signal. The positions of the switch 40 and the valve stem 31 are set.

  Further, in this oil filter device, as shown in FIGS. 1 to 3, a spring plate 50 is provided on the sleeve 33. The spring plate 50 has a disk shape with a larger outer diameter than the insertion hole 22a of the element plate 22, and has a cylindrical hole 50a into which the sleeve 33 can be fitted at the center. And is slidably fitted to the outer peripheral portion of the sleeve 33. The spring plate 50 is constantly pressed to the tip end side of the sleeve 33 by a pressing spring 51 interposed between the support block 36 of the lid 12 and, as shown in FIG. Is maintained in a state of abutting on the ring member 52 mounted on the outer peripheral surface of the distal end side of the sleeve 33.

  As apparent from FIGS. 1 to 3, a step portion 50 b that fits into the insertion hole 22 a of the element plate 22 is provided on the outer peripheral portion of the spring plate 50. The step portion 50 b has a function of fitting into the insertion hole 22 a when the spring plate 50 is pressed against the element plate 22 and matching the axial centers of the element plate 22 and the spring plate 50. Further, as shown in FIGS. 1 and 3, in a state where the tip end portion of the cylindrical hole 50 a is in contact with the ring member 52 of the sleeve 33, the distance d from the back surface of the lid body 12 to the tip end surface of the spring plate 50 is as follows. The distance d ′ from the upper surface of the element plate 22 to the upper surface of the thick portion 11b when the filter element 20 is accommodated in the case main body 11 is set. Reference numeral 39 in the figure denotes an oil seal member interposed between the outer peripheral surface of the sleeve 33 and the inner peripheral surface of the cylindrical hole 50a of the spring plate 50. Reference numeral 41 denotes a cover member that covers an upper area of the proximity switch 40 attached to the plug member 37.

  In the oil filter device configured as described above, when the lid body 12 is attached in a state where the filter element 20 is housed in the case body 11 of the filter case 10 as shown in FIG. The filter element 20 is pressed against the element plate 22 of the filter element 20, and is accommodated in a state where the filter element 20 is positioned inside the filter case 10.

  In this state, the upper end portion of the discharge pipe 16 is fitted into the insertion hole 22 a with respect to the element plate 22 positioned at the lower end of the filter element 20, and the center hole 21 a of the filter medium 21 is filtered through the discharge pipe 16. It is connected to the discharge port 16a of the case 10. With respect to the element plate 22 positioned at the upper end of the filter element 20, the insertion hole 22 a is closed by the spring plate 50. Furthermore, the sleeve 33 fitted into the cylindrical hole 50a of the spring plate 50 has an inlet port 33a formed at the base end portion that opens inside the filter case 10 between the lid 12 and the spring plate 50, and an outlet port. The tip portion where 33b is formed is in a state of being located inside the center hole 21a with respect to the filter medium 21 of the filter element 20. The outlet port 33b of the sleeve 33 positioned in the central hole 21a of the filter medium 21 is maintained in a state of being closed by the plug 32 because the plug 32 is in contact with the valve seat 33e of the sleeve 33 by the valve spring 34. ing.

  Accordingly, when oil flows into the filter case 10 through the inlet 15a from the above state, the oil passes through the filter medium 21 of the filter element 20 from the outer peripheral surface and reaches the center hole 21a of the filter medium 21; From there, it is discharged to the hydraulic oil tank via the discharge port 16a (arrow A in the figure: main flow path). During this time, the foreign material contained in the oil is removed by the filter medium 21 when passing through the filter element 20. As a result, even when oil is supplied from the hydraulic oil tank to the hydraulic actuator again through the hydraulic circuit (not shown), there is no risk of foreign matter entering the hydraulic circuit (not shown).

  On the other hand, when the filter medium 21 of the filter element 20 is clogged, the amount of oil passing through the main flow path A with respect to the inflowing oil is remarkably reduced, so that the pressure of the oil stored in the filter case 10 is reduced. As shown in FIG. 2, the outlet port 33b is opened when the plug 32 is separated from the valve seat 33e against the spring force of the valve spring 34. Thereby, the oil of the filter case 10 passes through the inlet port 33a and the outlet port 33b of the sleeve 33 without passing through the filter medium 21, reaches the center hole 21a of the filter medium 21, and operates from there through the discharge port 16a. The oil is discharged into the oil tank (arrow B in FIG. 2: bypass flow path). As a result, since the oil is discharged from the discharge port 16a to the hydraulic oil tank through the bypass flow path B, the oil can be continuously supplied to the hydraulic actuator.

  Moreover, when the outlet port 33b of the sleeve 33 is opened, the detection signal of the proximity switch 40 is switched from the ON signal to the OFF signal, so that this can be detected by a control means (not shown). Can be notified to the operator that the filter element 20 is clogged. This eliminates the possibility that the clogged filter element 20 will be used for a long time, minimizes the state in which oil that has passed through the bypass passage B is supplied to the hydraulic circuit (not shown), It is possible to prevent foreign matter from being mixed in.

  Here, even in the above-described oil filter device, when the flow rate of the oil flowing into the filter case 10 increases and the internal pressure of the filter case 10 increases, the case body 11 and the lid of the filter case 10 A situation may occur in which the body 12 deforms in response to the inflow and outflow of oil. However, since the proximity switch 40 is supported by the lid 12 and the plug 32 is supported by the lid 12 via the valve stem 31 and the sleeve 33, the deformation of the filter case 10 is detected by the proximity switch 40. It is possible to always detect clogging of the filter medium 21 accurately.

  In the above-described embodiment, the proximity sensor 40 is exemplified as the detection sensor. However, the present invention is not limited to this. For example, a stroke sensor that detects the amount of movement of the valve stem 31 relative to the sleeve 33 is applied. It doesn't matter.

  In the above-described embodiment, the ring member 52 is attached to the sleeve 33 so that the spring plate 50 is supported by the sleeve 33 when the lid 12 is removed from the case body 11. 20 can be easily replaced, and forgetting to attach the spring plate 50 and the pressing spring 51 can be prevented. However, it is not always necessary to support the spring plate 50 on the sleeve 33.

DESCRIPTION OF SYMBOLS 10 Filter case 11 Case main body 11a Bottom wall 11c Peripheral wall 12 Lid 15a Inflow port 16a Outlet port 20 Filter element 21 Filter material 21a Center hole 30 Valve unit 31 Valve stem 32 Plug 33 Sleeve 33a Inlet port 33b Outlet port 33e Valve seat 34 Valve spring 40 Proximity switch 50 Spring plate 50a Cylindrical hole 51 Pressing spring 52 Ring member A Main flow path B Bypass flow path

Claims (6)

A main flow path having an inflow port and an exhaust port and passing through the filter medium of the filter element between the inner peripheral side and the outer peripheral side of the filter element when the cylindrical filter element is mounted therein and the filter A filter case in which a bypass flow path not passing through the filter medium of the element is formed;
A valve unit that closes the bypass flow path in a normal state, and opens the bypass flow path when an upstream pressure exceeds a preset pressure;
A detection sensor that detects that the valve unit has opened the bypass flow path, and the oil that flows into the filter case from the inflow port passes through the main flow path and is discharged from the discharge port. In an oil filter device that filters oil with a filter medium,
The valve unit opens and closes the bypass flow path when a plug comes in contact with a valve seat provided on a sleeve.
The detection sensor detects movement of the plug;
An oil filter device characterized in that a sleeve in which the plug is movably disposed and the detection sensor are supported by the filter case. The sleeve of the valve unit has an inlet port opened at a peripheral surface, an outlet port opened at a tip, the inlet port is positioned between the filter element and the filter case, and a center hole of the filter medium Is supported by the filter case with the outlet port positioned in the
The valve unit plug is movably disposed on the sleeve via a valve stem, and is in contact with the valve seat by a valve spring interposed between the sleeve and the sleeve.
The oil filter device according to claim 1, wherein the detection sensor detects movement of the plug via the valve stem. The filter case includes a bottomed cylindrical case main body that houses the filter element, and a lid that closes an opening of the case main body so as to be openable and closable, and has the inlet on the peripheral wall of the case main body, It has the outlet in the center of the bottom wall of the case body,
Between the lid of the filter case and the spring plate that contacts the end face of the filter element, a pressure spring that supports the center hole of the filter medium at a position opened at the discharge port of the filter case is interposed,
The sleeve has an oil seal attached to an outer peripheral portion, and is inserted movably into a cylindrical hole formed in the spring plate via the oil seal,
The oil filter device according to claim 2, wherein a base end portion of the sleeve is supported by a lid of the filter case.   The sleeve has a ring member mounted on the outer peripheral surface on the tip side of the cylindrical hole of the spring plate, and supports the spring plate by the ring member when the lid is removed from the case body. The oil filter device according to claim 3. The plug closes the outlet port by contacting the tip of the sleeve when close to the lid, while opening the outlet port of the sleeve when separated from the lid,
The oil filter device according to claim 2, wherein the detection sensor outputs a detection signal when a distance between the valve sensor and the valve stem exceeds a preset value. A main flow path having an inflow port and an exhaust port and passing through the filter medium of the filter element between the inner peripheral side and the outer peripheral side of the filter element when the cylindrical filter element is mounted therein and the filter A filter case in which a bypass flow path not passing through the filter medium of the element is formed;
A valve unit that closes the bypass flow path in a normal state, and opens the bypass flow path when an upstream pressure exceeds a preset pressure;
A detection sensor that detects that the valve unit has opened the bypass flow path, and the oil that flows into the filter case from the inflow port passes through the main flow path and is discharged from the discharge port. In an oil filter device that filters oil with a filter medium,
The filter case includes a bottomed cylindrical case main body that houses the filter element, and a lid that closes an opening of the case main body so as to be openable and closable, and has the inlet on the peripheral wall of the case main body, It has the outlet in the center of the bottom wall of the case body,
The valve unit opens and closes the bypass flow path when a plug comes in contact with a valve seat provided on a sleeve.
The sleeve of the valve unit has an inlet port opened at the peripheral surface, an outlet port opened at the tip, and is movably inserted into the cylindrical hole of the spring plate via an oil seal attached to the outer peripheral portion. The inlet port is positioned between the filter element and the filter case, and the outlet port is positioned in the center hole of the filter medium.
The valve unit plug is movably disposed on the sleeve via a valve stem, and is in contact with the valve seat by a valve spring interposed between the sleeve and the sleeve.
The detection sensor detects the movement of the plug through the valve stem,
An oil filter device characterized in that the detection sensor is supported by a lid of the filter case, and the plug is supported by the lid of the filter case via the sleeve and the valve stem.

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