JP2020027008A - Oil level gauge fall-off prevention structure - Google Patents

Abstract

To provide an oil level gauge fall-off prevention structure which can suppress or prevent falling of an oil level gauge off a gauge insertion opening without causing an increase in crest part tightening margin.SOLUTION: In a state where an oil level gauge 6 is mounted to a gauge insertion opening 41, a crest part 23 escapes from the gauge insertion opening 41 to the inside of a transmission case 4 and is not in contact with an inner circumferential face 42 of the gauge insertion opening 41. Therefore, even when the internal pressure inside the transmission case 4 rises and the oil level gauge 6 is pushed by the internal pressure in a direction to slip away from the gauge insertion opening 41, the crest part 23 escaping from the gauge insertion opening 41 comes into contact with an inner tapered face 44 of the gauge insertion opening 41 to obstruct further movement of the oil level gauge 6.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a structure for preventing an oil level gauge from coming off.

  For example, in an automatic transmission, a clutch for connecting a rotating element to another rotating element and a brake for braking the rotating element are often used. It is necessary to supply oil (hydraulic oil) for operation to the clutch and the brake. Further, clutches, brakes, and the like must absorb the differential rotation between the rotating elements, and need to supply oil (lubricating oil) for lubrication.

  Therefore, an oil pan for storing oil is attached to the bottom of the transmission case forming the outer shell of the automatic transmission. Then, the oil stored in the oil pan is sucked up by the oil pump, and is supplied as hydraulic oil or lubricating oil to each part requiring oil supply through a valve body forming a hydraulic circuit.

  If the amount of oil stored in the oil pan (the amount of oil in the transmission case) is too large, the rotating body (for example, a differential gear) immersed in the oil will have high stirring resistance during rotation, resulting in energy loss. The fuel consumption is deteriorated due to the increase in the fuel consumption. On the other hand, if the amount of oil stored in the oil pan is too small, the hydraulic pressure of the working oil or the amount of lubricating oil may be insufficient, or the oil pump may not be able to suck up the oil well, and so-called air biting may occur. Or may occur.

  Therefore, the automatic transmission is provided with an oil level gauge in order to be able to confirm whether or not the amount of oil stored in the oil pan is within an appropriate range.

  FIG. 12 is a cross-sectional view showing a conventional oil level gauge 103 and a structure around the oil level gauge 103 in the transmission case 101.

  The transmission case 101 is provided with a gauge insertion port 102, and the oil level gauge 103 is inserted into the gauge insertion port 102 from the outside of the transmission case 101 and mounted on the gauge insertion port 102.

  The oil level gauge 103 is press-fitted into the gauge insertion port 102 to close the gauge insertion port 102, and extends from the rubber plug section 104 into the transmission case 101. The tip of the oil level gauge 103 is stored in the oil pan. The gauge part 105 immersed in oil, the cap part 106 provided on the side opposite to the gauge part 105 with respect to the rubber stopper part 104, and the hook part 107 projecting from the cap part 106 to the outside of the transmission case 101 are integrally formed. Have.

  The gauge insertion port 102 has a substantially cylindrical inner peripheral surface. The rubber plug portion 104 integrally has a substantially cylindrical columnar portion 108 and a mountain portion 109 projecting from the columnar portion 108 to the periphery. The outer diameter of the cylindrical portion 108 is smaller than the inner diameter of the gauge insertion port 102. Two peaks 109 are provided side by side in the direction of the central axis of the columnar part 108. Each peak 109 has a substantially triangular cross-sectional shape, and the cross-sectional shape surrounds the entire circumference of the columnar portion 109. The maximum outer diameter of each peak 109 is larger than the inner diameter of the gauge insertion port 102, and each peak 109 has an interference with the gauge insertion port 102. Therefore, in a mounted state in which the oil level gauge 103 is mounted on the gauge insertion port 102, each peak 109 always receives a compressive load from the inner peripheral surface of the gauge insertion port 102.

  In checking the oil amount, the operator hooks his / her finger on the hook 107 of the oil level gauge 103 in the mounted state, and the oil level gauge 103 is pulled out from the gauge insertion port 102. Since the tip of the gauge section 105 is immersed in the oil, the oil is attached to the tip of the gauge section 105 immediately after the oil level gauge 103 is pulled out from the gauge insertion port 102. The operator confirms the state of oil adhesion to the gauge portion 105, that is, the position of the upper end (the end on the rubber plug portion 104 side) of the portion where the oil is adhered, thereby checking the oil stored in the oil pan. It can be determined whether the amount is within an appropriate range. After confirming the oil amount, the operator inserts the oil level gauge 103 into the gauge insertion port 102 and returns the oil level gauge 103 to the mounted state.

JP 2017-161229 A

  When the internal pressure of the transmission case 101 rises, the internal pressure pushes up the oil level gauge 103, and there is a possibility that the rubber stopper 104 may come out of the gauge insertion port 102. In the conventional configuration, the release pressure when the internal pressure rises must be covered only by the friction between the peak 109 and the inner peripheral surface of the gauge insertion port 102, and the interference of the peak 109 needs to be set large. .

  Further, when the oil level gauge 103 is mounted, each peak 109 of the rubber plug 104 is constantly receiving a compressive load. Therefore, the peak 109 is deformed and deteriorated with the passage of time, so that the interference of the peak 109 is reduced, and the oil level gauge 103 is easily pulled out. Therefore, in the conventional configuration, it is necessary to set the interference in anticipation of the secular change of the peak 109.

  As the tightening margin of the peak 109 increases, the load when the oil level gauge 103 is inserted into and removed from the gauge insertion port 102 increases, and the workability of checking the oil amount deteriorates.

  SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure for preventing the oil level gauge from coming off from the gauge insertion port without increasing the interference of the mountain portion.

  In order to achieve the above object, the oil level gauge prevention structure according to the present invention is provided with a case in which a gauge insertion port is formed, and is provided so as to be able to be inserted into and removed from the gauge insertion port from outside the case. An oil level gauge for confirming the amount of stored oil, the oil level gauge includes a plug portion that is inserted into the gauge outlet and closes the gauge outlet, and the plug portion includes a plurality of plug portions. Ridges are formed side by side in the direction of insertion with respect to the gauge insertion port, and the ridges have an annular shape that is convex in the direction orthogonal to the insertion direction, and have a tight allowance for the gauge insertion port. The crest at the most downstream end in the direction is provided so as to be able to come out of the gauge insertion port into the case with the stopper closing the gauge insertion port.

  According to this configuration, the oil level gauge is inserted into the gauge insertion port formed in the case from outside the case. The oil level gauge is provided with a stopper for closing the gauge insertion port. A plurality of peaks are formed in the plug part in a line in the insertion direction with respect to the gauge insertion port. The mountain portion has an annular shape that is convex in a direction perpendicular to the insertion direction, and has a margin for the gauge insertion port. Thus, with the plug portion inserted into the gauge insertion port, the peak portion is pressed against the inner peripheral surface of the gauge insertion port, and the gauge insertion port is liquid-tightly closed by the plug portion.

  Then, in a state where the gauge insertion port is closed by the plug portion, the peak portion at the most downstream end in the insertion direction passes through the gauge insertion port into the case. Therefore, when the internal pressure in the case rises and the oil level gauge is pushed and moved in the direction to separate from the gauge insertion port due to the internal pressure, the crests coming out of the gauge insertion port The oil level gauge comes into contact with the peripheral edge and is prevented from further moving in the separating direction. As a result, it is possible to suppress or prevent the oil level gauge from coming off from the gauge insertion port.

  Also, when the oil level gauge is inserted into the gauge insertion port and mounted, the peak at the most downstream end in the insertion direction comes out of the gauge insertion port into the case. It is restored, and the vibration caused by the restoration is transmitted to the operator's hand. This allows the operator to feel that the attachment of the oil level gauge to the gauge insertion port is completed.

  According to the present invention, it is possible to suppress or prevent the oil level gauge from slipping out of the gauge insertion port without increasing the interference of the peak.

1 is a perspective view showing an oil level gauge according to an embodiment of the present invention and a part of an automatic transmission provided with the oil level gauge. FIG. 2 is a side view of the configuration shown in FIG. 1 when viewed from a vehicle width direction. It is a side view of an oil level gauge. It is sectional drawing which shows the structure of a gauge insertion port, and shows the state in which the oil level gauge was attached to the gauge insertion port. FIG. 5 is a cross-sectional view illustrating a configuration of a gauge insertion port, and illustrates a state where an oil level gauge has slightly moved in a detaching direction from a state illustrated in FIG. 4. It is sectional drawing which expands and shows the edge part of the outer side of a gauge insertion port, and the vicinity of a dust intrusion prevention part. It is sectional drawing which expands and shows the state which the peak part of the oil level gauge contacted the taper surface of the gauge insertion port. It is sectional drawing which expands and shows the state which the peak part of the oil level gauge contacted the taper surface of the gauge insertion port. It is sectional drawing which shows the state in which the oil level gauge is in the middle of being inserted in a gauge insertion port. It is sectional drawing which shows the structure in which a gauge insertion port does not have a taper surface. It is a perspective view showing a situation when an oil level gauge is attached to a gauge insertion slot in factory work. It is sectional drawing which shows the structure around the oil level gauge in the conventional oil level gauge and transmission case.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Position of oil level gauge>
FIG. 1 is a perspective view showing an oil level gauge 6 according to an embodiment of the present invention and a part of an automatic transmission 1 provided with the oil level gauge 6. FIG. 2 is a side view of the configuration shown in FIG. 1 as viewed from the vehicle width direction.

  The automatic transmission 1 is disposed in the engine compartment at the front of the vehicle 2 and on the right side of the tire housing in which the left front wheel 3 is accommodated. The automatic transmission 1 may be a stepped automatic transmission (AT: Automatic Transmission) or a continuously variable transmission (CVT: Continuously Variable Transmission). Further, the automatic transmission 1 may be a power split type continuously variable transmission. The power split type continuously variable transmission includes, for example, a belt-type continuously variable transmission mechanism that continuously changes the power by changing the speed ratio, and branches the power into two paths between an input shaft and an output shaft. This is a transmission that can be transmitted as a transmission.

  The automatic transmission 1 includes a transmission case 4. The transmission case 4 is, for example, an aluminum casting that is cast by die casting. An oil pan 5 for storing oil is attached to the bottom of the transmission case 4. Then, the oil stored in the oil pan 5 is sucked up by the oil pump, and is supplied as hydraulic oil or lubricating oil to each part of the transmission case 4 that requires oil supply through a valve body forming a hydraulic circuit. .

  Further, the automatic transmission 1 is provided with an oil level gauge 6 for enabling confirmation of whether or not the amount of oil stored in the oil pan 5 is within an appropriate range. The oil level gauge 6 is provided at a position where the left front wheel 3 is exposed in the tire housing in a state where the left front wheel 3 is steered to the left. As shown in FIG. 2, a side member 7 extends in the front-rear direction above the position of the oil level gauge 6, and a radiator hose 9 connected to a radiator 8 is provided in front of the position of the oil level gauge 6. Extend vertically.

<Composition of oil level gauge>
FIG. 3 is a side view of the oil level gauge 6.

  The oil level gauge 6 includes a plug portion 11, a gauge portion 12, a cap portion 13, and a holding portion 14. The plug portion 11, the cap portion 13, and the holding portion 14 are made of an elastically deformable material, for example, rubber, and are integrally formed by molding.

  The plug 11 is formed rotationally symmetrically about a center line extending in the longitudinal direction of the oil level gauge 6. The plug portion 11 is formed with three mountain portions 21, 22, 23 arranged in the center line direction. Each of the peaks 21, 22, and 23 has a triangular cross-section that protrudes radially outward, and the triangular cross-section forms an annular shape over the entire circumference of the plug 11 in the circumferential direction. The two peaks 21 and 22 are arranged in this order from one side in the center line direction, and are formed in the same shape. The remaining one peak 23 is provided on the other side in the center line direction with respect to the peaks 21 and 22, and is formed in a shape different from the two peaks 21 and 22. The specific shape of the peak 23 will be described later.

  Further, the plug portion 11 is formed with a flat, substantially columnar dust intrusion prevention portion 24 on one side in the center line direction with respect to the mountain portion 21.

  The gauge portion 12 is made of metal, and is formed in an elongated thin plate shape extending from the plug portion 11 to the other side in the center line direction.

  The cap portion 13 is provided on one side in the center line direction with respect to the plug portion 11. The cap portion 13 has a flat and substantially cylindrical shape, and is formed to have a larger diameter than the dust entry preventing portion 24 of the plug portion 11.

  The holding portion 14 is provided on one side in the center line direction with respect to the cap portion 13. The holding portion 14 includes a body portion 31 continuing to the cap portion 13 and a head portion 32 continuing to the body portion 31. The body 31 is formed in a cylindrical shape at the center in the center line direction, and is formed in such a shape that the diameter of the one end on the one side and the other end on the other side in the center line increases toward the end. The head 32 has a cylindrical side surface and a spherical end surface that is continuous to one side of the side surface in the center line direction. The surface including the side surface and the end surface of the head portion 32 extends over the entire periphery of the one end edge of the body portion 31 in the center line direction.

<Structure of gauge slot>
FIG. 4 is a cross-sectional view showing the configuration of the gauge insertion port 41, and shows a state in which the oil level gauge 6 is attached to the gauge insertion port 41. FIG. 5 is a cross-sectional view showing the configuration of the gauge insertion port 41, and shows a state in which the oil level gauge 6 has slightly moved in the separating direction from the state shown in FIG.

  The transmission case 4 has a gauge insertion port 41 formed at a portion facing the bottom surface of the oil pan 5. The gauge outlet 41 penetrates through the transmission case 4 and communicates inside and outside the transmission case 4.

  Further, the gauge insertion port 41 has a cylindrical inner peripheral surface 42. The outer end of the gauge insertion port 41 is chamfered, and the gauge insertion port 41 is continuous with the outer side of the inner peripheral surface 42 and is inclined so that the diameter increases toward the outer side. The tapered surface 43 is formed. The inner end of the gauge insertion port 41 is also subjected to the same chamfering processing as the outer end, and the gauge insertion port 41 is continuously connected to the inner side of the inner peripheral surface 42. And a tapered surface 44 which is inclined so that the diameter increases toward the inner side.

<Attached state of oil level gauge>
The oil level gauge 6 is inserted into the gauge insertion port 41 from outside the transmission case 4 with the gauge portion 12 facing the inside of the transmission case 4. The outer diameter of the cap portion 13 of the oil level gauge 6 is larger than the maximum inner diameter of the gauge insertion port 41, and when the cap portion 13 comes into contact with the transmission case 4, the oil level gauge 6 is further inserted into the gauge insertion port 41. And the oil level gauge 6 is attached to the gauge insertion port 41.

  In this mounted state, the two peaks 21 and 22 of the plug 11 and the dust intrusion prevention unit 24 are arranged in the gauge insertion port 41. The maximum outer diameter of the peaks 21 and 22 is larger than the inner diameter of the inner peripheral surface 42 of the gauge insertion port 41, and the peaks 21 and 22 have a margin with respect to the gauge insertion port 41. Therefore, in a state where the oil level gauge 6 is mounted on the gauge insertion port 41, the peaks 21 and 22 are elastically deformed and pressed against the inner peripheral surface 42 of the gauge insertion port 41, and the gauge insertion port 41 is plugged. The portion 11 is liquid-tightly closed.

  The maximum outer diameter of the peak 23 is the same as the maximum outer diameter of the peaks 21 and 22, and is larger than the inner diameter of the inner peripheral surface 42 of the gauge insertion port 41. However, in a state where the oil level gauge 6 is attached to the gauge insertion port 41, the peak portion 23 has slipped out of the gauge insertion port 41 into the transmission case 4, and has an inner peripheral surface 42 of the gauge insertion port 41. Not in contact.

  Therefore, even if the internal pressure in the transmission case 4 rises and the oil level gauge 6 is pushed and moved in a direction to separate from the gauge insertion port 41 due to the internal pressure, as shown in FIG. The ridge 23 coming out of the abutment 41 comes into contact with the tapered surface 44 on the inner side of the gauge insertion port 41, and further movement of the oil level gauge 6 is prevented.

  When the oil level gauge 6 is attached to the gauge insertion port 41, the tip of the gauge section 12 is immersed in the oil stored in the oil pan 5. Since the tip of the gauge portion 12 is immersed in the oil, the operator pulls out the oil level gauge 6 from the gauge insertion port 41, and the state of the oil attached to the gauge portion 12, that is, the upper end of the portion where the oil is attached. By confirming the position of the plug end, it is possible to determine whether the amount of oil stored in the oil pan 5 is within an appropriate range.

  FIG. 6 is an enlarged cross-sectional view showing the outer end of the gauge insertion port 41 and the vicinity of the dust entry prevention unit 24.

  The outer diameter of the dust entry preventing portion 24 is slightly smaller than the inner diameter of the inner peripheral surface 42 of the gauge insertion port 41. In a state where the oil level gauge 6 is mounted on the gauge insertion port 41, the dust intrusion prevention unit 24 separates a small gap G from the inner peripheral surface 42 of the gauge insertion port 41 and 42 and a tapered surface 43 continuous to the outside thereof.

  In the oil level gauge not provided with the dust intrusion prevention portion 24, a large space is formed between the oil level gauge and the inner peripheral surface 42 and the tapered surface 43 of the gauge insertion port 41 as shown by a broken line in FIG. Occurs. In comparison with this, the oil level gauge 6 is provided with the dust intrusion prevention portion 24, so that the space generated between the oil level gauge 6 and the inner peripheral surface 42 and the tapered surface 43 of the gauge insertion port 41 is reduced. The volume is reduced.

<Specific shape of the innermost end>
FIG. 7 is an enlarged sectional view showing a state in which the peak 23 of the oil level gauge 6 is in contact with the tapered surface 44 of the gauge insertion port 41. FIG. 8 is an enlarged cross-sectional view showing a state in which the peak 23 of the oil level gauge 6 is in contact with the tapered surface 43 of the gauge insertion port 41. FIG. 9 is a cross-sectional view showing a state where the oil level gauge 6 is being inserted into the gauge insertion port 41.

  The tapered surfaces 43 and 44 of the gauge insertion port 41 are inclined at the same angle α with respect to the inner peripheral surface 42.

  The innermost end crest 23 formed in the plug portion 11 of the oil level gauge 6 is continuous with the arc-shaped central side surface 51 and the outer side (one side in the center line direction) of the central side surface 51. It has an outer tapered surface 52 whose diameter decreases toward the side, and an inner taper surface 53 that continues to the inside of the central side surface 51 (the other side in the center line direction) and decreases in diameter toward the inside. The outer tapered surface 52 of the peak 23 is inclined at an angle β1 with respect to the tapered surface 44 on the inner side of the gauge insertion port 41, as shown in FIG. As shown in FIG. 8, the inner tapered surface 53 of the peak 23 is inclined at an angle β2 smaller than the angle β1 with respect to the outer tapered surface 43 of the gauge insertion port 41.

  With this configuration, when the oil level gauge 6 is pulled out from the gauge insertion port 41, the load required for deformation of the peak 23 when the peak 23 comes into contact with the tapered surface 44 on the inner side of the gauge insertion port 41 is reduced. On the other hand, while the oil level gauge 6 is being inserted into the gauge insertion port 41, it is necessary to deform the peak 23 when the peak 23 comes into contact with the outer tapered surface 43 of the gauge insertion port 41. The load becomes smaller.

<Effects>
As described above, even if the internal pressure in the transmission case 4 rises and the oil level gauge 6 is pushed and moved in the direction of separating from the gauge insertion port 41 due to the internal pressure, as shown in FIG. The peak 23 coming out of the insertion port 41 comes into contact with the tapered surface 44 on the inner side of the gauge insertion port 41, and further movement of the oil level gauge 6 is prevented. As a result, a function of preventing the oil level gauge 6 from coming off from the gauge insertion port 41 can be exhibited.

  As shown in FIG. 10, in a configuration in which the gauge insertion port 41 does not have the tapered surface 44, when the oil level gauge 6 moves in a direction to separate from the gauge insertion port 41, the gauge insertion port 41 is not moved. The edge on the inner side of the digging into the ridge 23 may damage the ridge 23. On the other hand, in the configuration in which the gauge insertion port 41 has the tapered surface 44, when the oil level gauge 6 moves in a direction to separate from the gauge insertion port 41, the inner side edge of the gauge insertion port 41 is moved. It is possible to suppress digging into the ridges 23 and prevent damage to the ridges 23.

  A tapered surface 43 that is inclined such that the diameter increases toward the outside is also formed at the end on the outside of the gauge insertion port 41. Thereby, when the oil level gauge 6 is inserted into the gauge insertion port 41, it is possible to prevent the outer edge of the gauge insertion port 41 from biting into the crest 23, thereby suppressing damage to the crest 23. it can.

  The taper surface 52 on the outer side of the peak 23 is inclined at an angle β1 with respect to the taper surface 44 on the inner side of the gauge insertion port 41, and the taper surface 53 on the inner side of the peak 23 is Is inclined at an angle β2 smaller than the angle β1 with respect to the tapered surface 43 on the outside. As a result, when the oil level gauge 6 is pulled out from the gauge insertion port 41, the load required for deformation of the peak 23 when the peak 23 comes into contact with the tapered surface 44 on the inner side of the gauge insertion port 41 is large. On the other hand, while the oil level gauge 6 is being inserted into the gauge insertion port 41, the load required for deformation of the peak 23 when the peak 23 comes into contact with the tapered surface 43 on the outer side of the gauge insertion port 41. Becomes smaller. As a result, when the internal pressure in the transmission case 4 increases, the load of the oil level gauge 6 coming off from the gauge insertion port 41 is large, and the oil level gauge 6 can be effectively prevented from coming off from the gauge insertion port 41. . On the other hand, when the oil level gauge 6 is inserted into the gauge insertion port 41, the insertion load of the oil level gauge 6 is small, and the operator can easily insert the oil level gauge 6 into the gauge insertion port 41.

  When the oil level gauge 6 is attached to the gauge insertion port 41, the peak 23 is restored in response to the removal of the peak 23 from the gauge insertion port 41. Transmitted to the hands of Thereby, the operator can be made to feel that the attachment of the oil level gauge 6 to the gauge insertion port 41 is completed.

  The oil level gauge 6 is provided with a dust entry prevention unit 24. When the oil level gauge 6 is mounted on the gauge insertion port 41, the dust entry prevention unit 24 is attached to the inner peripheral surface 42 of the gauge insertion port 41. A small gap G is left between the tapered surface G and the inner peripheral surface 42 and the tapered surface 43 continuous with the outer side. Thereby, as shown in FIG. 6, even if a gap is formed between the cap portion 13 of the oil level gauge 6 and the transmission case 4, it is possible to suppress dust from entering the gauge insertion port 41 from the gap. .

  Since the entry of dust into the gauge insertion port 41 is suppressed, the accumulation of dust in the gauge insertion port 41 can be suppressed. As a result, it is possible to suppress the dust accumulated in the gauge insertion port 41 from being caught between the peaks 21 and 22 of the oil level gauge 6 and the inner peripheral surface 42 of the gauge insertion port 41. Therefore, the inner peripheral surfaces 42 of the peaks 21 and 22 and the gauge insertion port 41 are damaged by dust, or a gap is formed between the peaks 21 and 22 and the inner peripheral surface 42 of the gauge insertion port 41 due to biting of dust. Can be suppressed, and oil leakage from the gauge insertion port 41 can be suppressed.

  Further, the provision of the dust intrusion prevention portion 24 reduces the volume of the space generated between the oil level gauge 6 and the inner peripheral surface 42 and the tapered surface 43 of the gauge insertion port 41. Even if dust enters the entrance 41, the amount of dust accumulated in the space can be reduced. As a result, it is possible to prevent the dust accumulated in the gauge insertion port 41 from dropping into the transmission case 4 at the time of checking the oil amount.

  Further, since the outer diameter of the dust entry prevention unit 24 is slightly smaller than the inner diameter of the inner peripheral surface 42 of the gauge insertion port 41, the dust entry prevention unit 24 inserts and removes the oil level gauge 6 from the gauge insertion port 41. It does not affect the load when performing. Therefore, good workability at the time of checking the oil amount can be secured.

  The holding portion 14 of the oil level gauge 6 includes a body 31 and a head 32 continuous with the body 31. The body 31 is formed in a cylindrical shape at the center in the center line direction, and is formed in such a shape that the diameter of the one end on the one side and the other end on the other side in the center line increases toward the end. Therefore, even if an obstacle such as the side member 7 exists around the oil level gauge 6 attached to the gauge insertion port 41, as shown in FIGS. Can be pinched with two fingers from the side. Then, the operator can pull out the oil level gauge 6 from the gauge insertion port 41 by moving the wrist while holding the torso 31 with two fingers and lifting the torso 31. Further, the operator can insert the oil level gauge 6 into the gauge insertion port 41 by moving the wrist while holding the torso 31 with two fingers and pushing down the torso 31. Therefore, even when the oil level gauge 6 is accessed from the tire housing of the vehicle 2, the oil level gauge 6 can be properly inserted into and removed from the gauge insertion port 41.

  Further, since the body 31 is formed in a rotationally symmetrical shape around its center line, it is not necessary to adjust the direction of the body 31 when the body 31 is pinched with two fingers of the work vehicle.

  Therefore, the oil level gauge 6 is excellent in workability by accessing from the side.

  Further, since the stopper 11, the cap 13 and the holding portion 14 are made of a material which can be elastically deformed, when the operator pulls out the oil level gauge 6 from the gauge insertion port 41, the stopper 11, the cap 13 and the holding By deforming the part 14, the oil level gauge 6 can be pulled obliquely forward. Even when the operator inserts the oil level gauge 6 into the gauge insertion port 41, the oil level gauge 6 can be inserted obliquely from the front by deforming the plug portion 11, the cap portion 13, and the holding portion 14. Therefore, even if there is an obstacle around the oil level gauge 6, the oil level gauge 6 can be easily inserted into and removed from the gauge insertion port 41 while avoiding interference between the obstacle and the oil level gauge 6. Can be.

  Since the head 32 has a surface that extends over the entire periphery of the edge of the body 31, when the oil level gauge 6 is attached to the gauge insertion port 41 during factory work, as shown in FIG. Then, the operator can press the head 32 from above with the thumb of the hand. Therefore, the worker can easily apply a force to the oil level gauge 6, so that the worker's working fatigue can be reduced and the working speed can be improved.

  In the conventional configuration shown in FIG. 12, for example, after the gauge portion 105 and the hook portion 107 are fastened with a rivet, these are set in a molding die of the rubber stopper portion 104 and the cap portion 106, and the rubber stopper is formed. The part 104 and the cap part 106 are formed. On the other hand, the oil level gauge 6 does not need to be riveted before setting the gauge portion 12 to the mold of the plug portion 11, the cap portion 13, and the holding portion 14, thereby reducing the manufacturing cost.

<Modification>
As described above, one embodiment of the present invention has been described. However, the present invention can be embodied in other forms, and various modifications can be made to the above-described configuration within the scope of the matters described in the claims. Can be applied.

4: Transmission case (case)
6: Oil level gauge 11: Plug part 21, 22, 23: Mountain part 41: Gauge socket

Claims (1)

A case with a gauge outlet,
An oil level gauge provided so as to be able to be inserted and removed from the outside of the case to the gauge insertion port and for confirming an amount of oil stored in the case;
The oil level gauge includes a stopper that is inserted into the gauge outlet to close the gauge outlet,
In the plug portion, a plurality of peaks are formed side by side in the insertion direction with respect to the gauge insertion port,
The crest portion has an annular shape that is convex in a direction orthogonal to the insertion direction, and has an interference with respect to the gauge insertion port,
The crest portion at the most downstream end in the insertion direction is provided so as to pass through the gauge insertion port into the case in a state where the stopper closes the gauge insertion port. Drop-off prevention structure.

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