JP2016164390A - Floating type oil level detection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil level detection device enabling a signal to be surely transmitted, in overturn of an engine.SOLUTION: A ceiling part 70 of a housing 50 has a housing side inclination surface part 71 whose diameter is made wider downward. The upper part of a float 60 has a float side inclination surface part 62 that is inclined in a vertically movable manner along the housing side inclination surface part 71. When an engine overturns, the float 60 enables the float side inclination surface part 62 to move toward a bottom part 51 of the housing 50 while contacting with the housing side inclination surface part 71, by gravity or buoyancy from oil.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a float type oil level detection device using a float that can move up and down following the oil level of oil.

  Some engines have oil stored in the lower part of the engine for the purpose of lubricating the engine. In order to determine whether or not a predetermined amount of oil is stored, an oil level detection device is provided in the engine. For example, there is a float type oil level detection device disclosed in Patent Document 1 as a technology related to a detection device that detects the oil level of oil in a working machine engine.

  A float type oil level detection device disclosed in Patent Document 1 includes a housing that is provided in an oil pan of an engine and allows the oil filled in the oil pan to enter and exit, and an oil level of oil that is housed in the housing. And a movable contact provided on the bottom surface of the float.

  When the oil level drops, the float descends and approaches the housing. When the oil level is lower than a predetermined height, the lower surface of the float comes into contact with the bottom surface of the housing. At this time, the movable contact of the float contacts the fixed contact of the housing, and a signal is transmitted to the engine control unit. Thereby, it is detected that the oil level is lower than a predetermined height. Thereafter, the engine control unit stops ignition and the engine is stopped. Similarly, when starting the engine, if the oil level is lower than a predetermined height, the engine can be controlled not to start.

  Here, when the work implement falls, gravity works not in the lower surface direction of the float but in the side surface direction. The float moves toward the inner surface of the housing, and the side surface of the float contacts the inner surface of the housing. On the other hand, the movable contact and the fixed contact may not contact each other. That is, when the work machine falls, there is a possibility that the engine cannot be stopped using the oil level detection device. The same applies when the buoyancy caused by oil acts on the float.

  For this reason, in order to detect the fall of the work implement, for example, it is common to separately install a fall detection switch that detects when the tilt angle is detected by a pendulum or an acceleration sensor and the work implement exceeds a certain tilt angle. Is. However, the addition of such a switch increases the number of parts and increases the cost. It would be desirable to be able to detect the fall of the work implement without adding a new switch.

Japanese Patent No. 4391968

  An object of the present invention is to provide an oil level detection device capable of reliably transmitting a signal when the engine falls.

According to the first aspect of the present invention, a housing that is provided in the oil pan of the engine and allows the oil filled in the oil pan to enter and exit, and an upper and lower portion that is housed inside the housing and follows the oil level of the oil. And a movable contact provided on the bottom surface of the float.
In the float type oil level detection device that detects that the oil level is lower than a predetermined height by the float descending and the movable contact contacting the fixed contact,
The ceiling portion of the housing includes a housing-side inclined surface portion whose diameter is expanded downward,
The upper portion of the float includes a float-side inclined surface portion that is inclined so as to move up and down along the housing-side inclined surface portion,
The float is movable toward the bottom of the housing while the float-side inclined surface is in contact with the housing-side inclined surface due to gravity or buoyancy received from the oil when the engine falls. A float type oil level detection device is provided.

According to the second aspect of the present invention, a housing that is provided in the oil pan of the engine and allows the oil filled in the oil pan to enter and exit, and a housing that is housed in the housing and that follows the oil level of the oil is moved up and down. And a movable contact provided on the bottom surface of the float.
In the float type oil level detection device that detects that the oil level is lower than a predetermined height by the float descending and the movable contact contacting the fixed contact,
Inside the housing is provided with a tapered shaft portion that gradually decreases in diameter from the ceiling portion to the bottom surface portion,
The float is formed with a through hole through which the tapered shaft portion passes,
The through hole has a shape along the tapered shaft portion,
The float is movable toward the bottom of the housing while the through-hole abuts against the tapered shaft portion by gravity or buoyancy received from the oil when the engine falls. An oil level detection device is provided.

  In the invention according to claim 1, the ceiling portion of the housing includes a housing-side inclined surface portion whose diameter is expanded downward, and an upper portion of the float is inclined to be movable up and down along the housing-side inclined surface portion. Including face part.

  When the engine falls, when there is no oil in the housing, the float moves downward due to gravity and contacts the housing. Here, the housing-side inclined surface portion in contact with the float is expanded in diameter downward. Therefore, the gravitational force acts on the float in the tilt direction. As a result, the float moves toward the bottom of the housing while the float-side inclined surface portion contacts the housing-side inclined surface portion.

  On the other hand, when the oil is accumulated in the housing at the time of falling, the float moves upward by buoyancy received from the oil and contacts the housing. Similarly to the above, the float comes into contact with the housing-side inclined surface portion whose diameter is increased downward. Therefore, the buoyancy component acts on the float in the tilt direction. As a result, the float moves toward the bottom of the housing while the float-side inclined surface portion contacts the housing-side inclined surface portion.

  From the above, at the time of falling, regardless of the amount of oil, the float can move in the tilt direction due to gravity or a component of buoyancy received from the oil. Thereafter, when the movable contact of the float comes into contact with the fixed contact of the housing, a signal is transmitted to the engine control unit, and the engine can be stopped. Further, in the overturned state, the movable contact of the float and the fixed contact of the housing remain in contact with each other, and the signal can be transmitted. Thereby, it can control so that an engine may not be started in the state of falling.

  In the invention according to claim 2, a taper shaft portion that gradually decreases in diameter from the ceiling portion to the bottom surface portion is provided inside the housing, and a through hole through which the taper shaft portion passes is formed in the float. The through hole has a shape along the tapered shaft portion.

  When the engine falls, when there is no oil in the housing, the float moves downward due to gravity, and the through hole formed in the float contacts the tapered shaft portion. Here, the taper shaft portion with which the through hole comes into contact is gradually reduced in diameter from the ceiling portion to the bottom surface portion. Therefore, the gravitational force acts on the float in the tilt direction. As a result, the float moves toward the bottom of the housing while the through hole is in contact with the tapered shaft portion.

  On the other hand, when the oil is accumulated in the housing during the fall, the float moves upward due to the buoyancy received from the oil, and the through hole comes into contact with the tapered shaft portion. Similar to the above, this tapered shaft portion is gradually reduced in diameter from the ceiling portion to the bottom surface portion. Therefore, the buoyancy component received from the oil acts on the float in the tilt direction. As a result, the float moves toward the bottom of the housing while the through hole is in contact with the tapered shaft portion.

  From the above, at the time of falling, regardless of the amount of oil, the float can move in the tilt direction due to gravity or a component of buoyancy received from the oil. Thereafter, when the contacts come into contact with each other, a signal is transmitted to the engine control unit, and the engine can be stopped. Further, in the overturned state, the movable contact of the float and the fixed contact of the housing remain in contact with each other, and the signal can be transmitted. Thereby, it can control so that an engine may not be started in the state of falling.

It is sectional drawing of the engine to which the float type oil level detection apparatus by Example 1 of this invention was attached. It is an enlarged view of the float type oil level detection apparatus shown by FIG. It is a figure explaining the general effect | action and effect of the float type oil level detection apparatus shown by FIG. FIG. 3 is an operation diagram of the float type oil level detection device shown in FIG. 2. It is a perspective view of the float type oil level detection apparatus by Example 2 of this invention. FIG. 6 is an operation diagram of the float type oil level detection device shown in FIG. 5. It is an effect | action figure of the float type oil level detection apparatus by Example 3 of this invention. It is an effect | action figure of the float type oil level detection apparatus by Example 4 of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
<Example 1>

  Please refer to FIG. FIG. 1 is a cross-sectional view of the engine 10 as viewed from the direction in which the crankshaft 15 extends. The engine 10 is an inclined cylinder type OHC air-cooled single cylinder internal combustion engine in which a cylinder 16 is inclined with respect to a crankshaft 15.

  The engine 10 includes a crankcase 11, a cylinder block 12 formed integrally with the crankcase 11, a cylinder head 13 provided at an end of the cylinder block 12, and a head cover that covers the tip of the cylinder head 13. 14.

  A crankshaft 15 is rotatably accommodated in the crankcase 11. A cylinder 16 is formed inside the cylinder block 12, and a piston 17 that reciprocates inside the cylinder 16 is disposed. The piston 17 is connected to the crankshaft 15 via a connecting rod 18 and a crankpin 19.

  An intake port 21 and an exhaust port 22 are formed inside the cylinder head 13, and a valve operating mechanism 30 is also provided. The valve operating mechanism 30 includes a cam shaft 31, a rocker shaft 32, an intake valve rocker arm 33, an intake valve 34, an exhaust valve rocker arm 35 and an exhaust valve 36.

  A region surrounded by the cylinder 16, the tip of the piston 17, and the cylinder head 13 is a combustion chamber 37. Fuel is combusted in the combustion chamber 37, the piston 17 moves in the direction of the crankshaft 15 by the combustion gas, and the crankshaft 15 rotates. Further, intake and exhaust are performed by the valve mechanism 30.

  Here, the reciprocating motion of the piston 17 and the accompanying rotation of the crankshaft 15 require lubrication with the oil Oi. Therefore, oil Oi is stored in the oil pan 23 provided in the lower part of the crankcase 11.

  The connecting rod 18 includes an oil scraping unit 24 for drawing up the oil Oi. The oil scraping unit 24 scrapes up the oil Oi accumulated in the oil pan 23 as the crankshaft 15 rotates, and supplies the oil Oi into the crankcase 11 and the cylinder 16. The supplied oil Oi enters the sliding portion of each member in the crankcase 11 and the cylinder 16.

  For this lubrication, the oil pan 23 needs to have a predetermined amount of oil Oi. Therefore, a float type oil level detection device 40 (hereinafter referred to as an oil level detection device 40) that detects the height of the oil surface of the oil Oi is provided at the tip of the extending portion 25 that extends from the lower portion of the engine 10. It has been.

  Please refer to FIG. 2 and FIG. The oil level detection device 40 moves up and down following the oil level of the oil Oi housed in the housing 50 and the housing 50 that allows the oil Oi filled in the oil pan 23 (see FIG. 1) to enter and exit. It consists of a possible float 60, fixed contacts 41, 41 provided on the bottom surface of the housing, and a movable contact 42 provided on the bottom surface of the float 60 and facing the fixed contacts 41, 41.

  The housing 50 is formed integrally with an extending portion 25 extending from the lower portion of the engine 10 (see FIG. 1), a circular bottom surface portion 51, and a cylindrical portion 52 extending upward from the edge of the bottom surface portion 51, And a ceiling portion 70 that covers the upper portion of the cylindrical portion 52. A cover 53 for preventing a sudden inflow of oil Oi is covered on the bottom surface portion 51 from below.

  The ceiling portion 70 includes a housing-side truncated cone portion 71 (housing-side inclined surface portion 71) whose diameter increases toward the bottom surface portion 51, and a lid portion 72 that covers the upper portion of the housing-side truncated cone portion 71. The inclination angle α of the housing-side truncated cone part 71 is approximately 45 ° with respect to the vertical direction.

  Passage holes 51 a and 51 a that allow oil Oi to enter and exit are formed in the bottom surface portion 51 of the housing 50. Similarly, a passage hole 72 a that allows oil Oi to enter and exit is formed in the center of the lid portion 72. In the center of the cover 53, a passage hole 53a that allows the oil Oi to enter and exit is formed.

  The float 60 is insulative, and includes a column portion 61 and a float-side truncated cone portion 62 (float side) that is formed integrally with the column portion 61 and is tilted up and down along the housing-side truncated cone portion 71. An inclined surface portion 62).

  The fixed contacts 41 and 41 are conductive members that stand upward from the bottom surface 51 of the housing 50. Conductive wires 43 for transmitting signals are attached to the fixed contacts 41 and 41. The movable contact 42 attached to the lower surface of the float 60 is a conductive flat horizontal disk. The combined structure of the movable contact 42 and the fixed contacts 41, 41 constitutes an oil level switch 44.

  Please refer to FIG. Hereinafter, general operations and effects of the oil level detection device 40 will be described.

  FIG. 3A is a cross-sectional view of a main part of the oil level detection device 40 in a state where the oil Oi is accumulated up to the upper limit level Le1. The upward force acts on the float 60 due to the buoyancy received from the oil Oi, and the float 60 remains in contact with the ceiling portion 70 of the housing 50. The movable contact 42 is away from the fixed contacts 41, 41, and the oil level switch 44 is in an OFF state.

  Thereafter, as the operating time of the engine 10 (FIG. 1) becomes longer, the height of the oil Oi decreases, and the float 60 moves downward toward the bottom surface portion 51 of the housing 50.

  FIG. 3B shows a cross-sectional structure of the main part of the oil level detection device 40 in a state in which the oil Oi is lowered to the lower limit level Le2. The movable contact 42 is in contact with the fixed contacts 41 and 41, and it is detected that the height of the oil Oi is lower than the lower limit level Le2. The oil level switch 44 is turned on, a detection signal is issued and transmitted to the engine control unit. Thereby, the engine 10 is stopped.

  Next, operations and effects unique to the present invention when the engine 10 is overturned will be described in comparison with the prior art.

  Reference is made to FIG. The oil level detection device 100 according to the prior art includes a housing 102 having a cylindrical shape in which passage holes 101 and 101 that allow oil Oi to enter and exit are formed, and a float 103 having a cylindrical shape that is housed in the housing 102. The fixed contacts 104 and 104 are provided on the bottom surface of the housing, and the movable contacts 105 are provided on the bottom surface of the float 103 and face the fixed contacts 104 and 104.

  When the engine to which the oil level detection device 100 is attached falls, the float 103 moves upward by buoyancy and contacts the side surface portion 102 a of the housing 102. A drag force against buoyancy acts on the float 103 from the side surface portion 102a.

  However, since the side surface portion 102 a extends in the horizontal direction, no force acts on the float 103 in the horizontal direction. Therefore, the float 103 stays on the spot. The fixed contacts 104 and 104 and the movable contact 105 are not in contact with each other, and a signal cannot be transmitted from the oil level detection device 100. As a result, the engine cannot be stopped.

  Reference is made to FIG. In the oil level detection device 40 according to the present invention, the ceiling portion 70 of the housing 50 includes a housing side truncated cone portion 71 (housing side inclined surface portion 71) whose diameter is increased toward the bottom surface portion 51. The upper part of the float 60 includes a float-side truncated cone part 62 (float-side inclined surface part 62) that is tilted so as to be movable along the housing-side truncated cone part 71.

  When the engine 10 falls, when the oil Oi is accumulated up to the upper limit level Le1, the float 60 moves upward due to the buoyancy received from the oil Oi and contacts the housing 50. Here, the housing-side truncated cone portion 71 with which the float 60 comes into contact is enlarged in diameter toward the bottom surface portion 51. Therefore, the buoyancy component acts on the float 60 in the tilt direction. As a result, the float 60 moves toward the bottom surface 51 of the housing 50 while the float side truncated cone part 62 abuts on the housing side truncated cone part 71.

  Reference is made to FIG. On the other hand, when the oil Oi is not at the lower limit level Le <b> 2 during the fall, the float 60 moves downward due to gravity and contacts the housing 50. The housing-side truncated cone portion 71 with which the float 60 comes into contact is expanded in diameter downward. Therefore, the gravity force acts on the float 60 in the inclination direction. As a result, the float 60 moves toward the bottom surface 51 of the housing 50 while the float side truncated cone part 62 abuts on the housing side truncated cone part 71.

  From the above, when the engine 10 falls down, the float 60 can move in the tilt direction by the buoyancy or gravity force received from the oil Oi regardless of the amount of the oil Oi. Thereafter, when the movable contact 42 of the float 60 and the fixed contacts 41, 41 of the housing 50 come into contact with each other, a signal is transmitted to the engine control unit, and the engine 10 can be stopped.

  Further, in the overturned state, the movable contact 42 of the float 60 and the fixed contacts 41 and 41 of the housing 50 remain in contact with each other, and the signal can be transmitted. Thereby, it can control so that the engine 10 is not started in the fall state.

  In this embodiment, the inclination angle α of the truncated cone portion is set to about 45 °. However, the inclined surface portion is appropriately changed in consideration of the moving distance and speed of the float 60 and the degree of contact between the contacts after contact. Can do.

  Returning to FIG. The float side truncated cone part 62 is formed along the housing side truncated cone part 71. Therefore, when the oil Oi is accumulated up to the upper limit level Le1 and the engine 10 is in a standing state, the float side truncated cone part 62 contacts not only the lid part 72 of the ceiling part 70 but also the housing side truncated cone part 71. Stay in the state. That is, when the engine 10 is in a normal state, the movement of the float 60 in the horizontal direction is suppressed, and wear between the float 60 and the housing 50 is reduced.

<Example 2>
Next, a second embodiment of the present invention will be described. In the second embodiment, the shape of the inclined portion of the housing 50 and the float 60 is different from the first embodiment. About another structure, it is the same as that of the oil level detection apparatus 40 of Example 1, and it abbreviate | omits description while omitting a code | symbol.

  Please refer to FIG. 5 and FIG. The ceiling portion 70 </ b> A of the housing 50 </ b> A has a circular shape that covers the upper end of the cylindrical portion 52. Inside the housing 50A, a tapered shaft portion 73 that gradually decreases in diameter from the ceiling portion 70A to the bottom surface portion 51 is provided. The float 60 </ b> A is formed with a through hole 63 through which the tapered shaft portion 73 passes. The through hole 63 has a shape along the tapered shaft portion 73.

  Hereinafter, the operation and effect of the present invention when the engine is overturned will be described in comparison with the prior art.

  Reference is made to FIG. In the oil level detection device 200 according to the prior art, the shaft portion 202 provided in the housing 201 extends in the vertical direction from the bottom surface portion 203 to the ceiling portion 204. The float 205 is formed with a through hole 206 through which the shaft portion 202 penetrates, and the through hole 206 has a shape along the shaft portion 202.

  When the engine to which such an oil level detection device 200 is attached falls, the float moves upward by 205 buoyancy, and the through hole 206 contacts the shaft portion 202. A resistance against buoyancy acts on the float 205 from the shaft portion 202.

  However, since the shaft portion 202 faces in the horizontal direction, no force acts on the float 205 in the horizontal direction. Therefore, the float 205 stays on the spot. The fixed contacts 207 and 207 and the movable contact 208 are not in contact with each other, and a signal cannot be transmitted from the oil level detection device 200. As a result, the engine cannot be stopped.

  Reference is made to FIG. In the oil level detection device 40 </ b> A according to the present invention, the housing 50 </ b> A is provided with a tapered shaft portion 73, and the float 60 is formed with a through hole 63 along the tapered shaft portion 73.

  When the engine 10 falls, when the oil Oi is accumulated up to the upper limit level Le1, the float 60A moves upward due to the buoyancy received from the oil Oi, and the through hole 63 contacts the taper shaft portion 73. Here, the diameter of the tapered shaft portion 73 with which the through-hole 63 contacts is gradually reduced from the ceiling portion 70 to the bottom surface portion 51. Therefore, for the float 60A, the buoyancy component received from the oil Oi acts in the tilt direction. As a result, the float 60 </ b> A moves toward the bottom surface 51 of the housing 50 </ b> A while the through-hole 63 is in contact with the tapered shaft portion 73.

  Reference is made to FIG. When the engine 10 falls and the oil Oi is not at the lower limit level Le2, the float 60A moves downward due to gravity, and the through hole 63 formed in the float 60A comes into contact with the tapered shaft portion 73. As described above, the tapered shaft portion 73 is gradually reduced in diameter from the ceiling portion 70 to the bottom surface portion 51. Therefore, the gravity force acts on the float 60A in the tilt direction. As a result, the float 60 </ b> A moves toward the bottom surface 51 of the housing 50 </ b> A while the through-hole 63 is in contact with the tapered shaft portion 73.

  From the above, at the time of falling, regardless of the amount of oil Oi, the float 60A can move in the tilt direction by the buoyancy or gravity force received from the oil Oi. Thereafter, when the contacts come into contact with each other, a signal is transmitted to the engine control unit, and the engine 10 can be stopped. Further, in the overturned state, the movable contact 42 of the float 60A and the fixed contacts 41 and 41 of the housing 50A remain in contact with each other, and the signal can be transmitted. Thereby, it can control so that the engine 10 is not started in the fall state.

Next, Example 3 and Example 4 will be described.
In the third and fourth embodiments, the shapes of the ceiling portion 70 of the housing 50 and the upper portion of the float 60 are different from those of the first embodiment. About another structure, it is the same as that of the detection apparatus of Example 1, and it abbreviate | omits description while omitting a code | symbol.

<Example 3>
Please refer to FIG. The upper surface of the housing 50B includes a housing-side hemispherical portion 70B having a substantially hemispherical shape with a passage hole 72a allowing oil Oi to enter and exit at the tip. The upper portion of the float 60B includes a float-side hemisphere portion 62B that is inclined so as to be movable along the housing-side hemisphere portion 70B.

  Also in the oil level detection device 40B, the predetermined effect of the present invention can be obtained. Further, the oil level detection device 40B can obtain the following predetermined effects.

  With reference to the inclined line L of the housing-side truncated cone portion 71 (see FIG. 4B) of the first embodiment, the housing-side hemispherical portion 70B swells outward from the housing 50B. It becomes difficult to contact the housing-side hemisphere portion 70B. Therefore, when the engine 10 falls, the initial speed of the float 60B toward the cylindrical portion 52 is fast, and the fall can be detected quickly.

<Example 4>
Please refer to FIG. The ceiling portion 70C includes a lid portion 72 formed with a passage hole 72a that allows oil Oi to enter and exit, a housing-side bell portion 71C that has a bell shape that expands from the lid portion 72 toward the bottom surface portion 51, Consists of. The upper portion of the float 60C includes a float-side bell portion 62C that is tilted so as to be movable along the housing-side bell portion 71C.

  Also in the oil level detection device 40C, the predetermined effect of the present invention can be obtained. Further, the oil level detection device 40C can obtain the following predetermined effects.

  Based on the inclination line L of the housing-side truncated cone portion 71 (see FIG. 4B) according to the first embodiment, the housing-side bell portion 71C has a shape pushed inward of the housing 50C. Since the space between the float 60C and the housing 50C is narrowed, the movement of the float 60C is suppressed after the contact between the fixed contacts 41 and 41 and the movable contact 42. The contact degree between the contacts is increased, and the fall of the engine 10 can be detected more reliably.

  Note that, as shown in the first to fourth embodiments, the housing-side inclined surface portion 71 and the float-side inclined surface portion 62 act on the float 60 with a component force of buoyancy from gravity or oil. As long as it moves toward the bottom surface portion 51, the present invention is not limited to the above embodiment, and can be changed as appropriate.

  Furthermore, the shape of the housing 50 is not limited to a cylinder, and may have a prismatic shape. In this case, the housing side inclined surface portion 71 and the float side inclined surface portion 62 may have a configuration in which a plurality of planes are combined.

  The float type oil level detection device of the present invention is suitable for mounting on a working machine engine.

DESCRIPTION OF SYMBOLS 10 ... Engine 25 ... Extension part 40 ... Oil level detection apparatus 41 ... Fixed contact 42 ... Movable contact 50 ... Housing 51 ... Bottom part 52 ... Cylindrical part 61 ... Column part 62 ... Float side truncated cone part, 62B ... Float side hemisphere Part 62C ... float side bell part 70 ... ceiling part, 70B ... housing side hemisphere part 71 ... housing side truncated cone part, 71B ... housing side bell part 72 ... lid part 73 ... taper shaft part

Claims (2)

A housing provided in an oil pan of the engine that allows oil filled in the oil pan to enter and exit, a float that is housed in the housing and that can move up and down following the oil level of the oil, and the housing Consisting of a fixed contact provided on the bottom surface portion and a movable contact provided on the lower surface of the float,
In the float type oil level detection device that detects that the oil level is lower than a predetermined height by the float descending and the movable contact contacting the fixed contact,
The ceiling portion of the housing includes a housing-side inclined surface portion whose diameter is expanded downward,
The upper portion of the float includes a float-side inclined surface portion that is inclined so as to move up and down along the housing-side inclined surface portion,
The float is movable toward the bottom of the housing while the float-side inclined surface is in contact with the housing-side inclined surface due to gravity or buoyancy received from the oil when the engine falls. Float type oil level detection device. A housing provided in an oil pan of the engine that allows oil filled in the oil pan to enter and exit, a float that is housed in the housing and that can move up and down following the oil level of the oil, and the housing Consisting of a fixed contact provided on the bottom surface portion and a movable contact provided on the lower surface of the float,
In the float type oil level detection device that detects that the oil level is lower than a predetermined height by the float descending and the movable contact contacting the fixed contact,
Inside the housing is provided with a tapered shaft portion that gradually decreases in diameter from the ceiling portion to the bottom surface portion,
The float is formed with a through hole through which the tapered shaft portion passes,
The through hole has a shape along the tapered shaft portion,
The float is movable toward the bottom of the housing while the through-hole abuts against the tapered shaft portion by gravity or buoyancy received from the oil when the engine falls. Oil level detector.

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