JP7221009B2 - transmission - Google Patents

Description

The present invention relates to transmissions.

For example, automatic transmissions often use a clutch for connecting a rotating element with another rotating element and a brake for braking the rotating element. Clutches and brakes need to be supplied with oil (hydraulic oil) for operation. In addition, clutches, brakes, and the like must absorb differential rotation between rotating elements, and require the supply of oil (lubricating oil) for lubrication.

Therefore, an oil pan that stores oil is attached to the bottom of the transmission case that forms the outer shell of the automatic transmission. The oil stored in the oil pan is sucked up by the oil pump and 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 oil-immersed rotors (differential gears, etc.) will experience greater agitation resistance during rotation, resulting in energy loss. increase in fuel consumption. On the other hand, if the amount of oil stored in the oil pan is too small, the oil pressure of the hydraulic oil or the amount of lubricating oil will be insufficient, or the oil pump will not be able to suck up the oil well, resulting in so-called air entrainment. may occur.

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

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

A transmission case 101 is provided with a gauge insertion port 102 , and an oil level gauge 103 is inserted into the gauge insertion port 102 from the outside of the transmission case 101 and attached to the gauge insertion port 102 .

The oil level gauge 103 includes a rubber plug portion 104 that is press-fitted into the gauge insertion port 102 and closes the gauge insertion port 102, and extends from the rubber plug portion 104 into the transmission case 101, the tip of which is stored in the oil pan. A gauge portion 105 that is soaked in oil, a cap portion 106 that is provided on the side opposite to the gauge portion 105 with respect to the rubber plug portion 104, and a hook portion 107 that protrudes from the cap portion 106 to the outside of the transmission case 101 are integrated. 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 peak portion 109 projecting from the columnar portion 108 to the surroundings. 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 central axis direction of the cylindrical portion 108 . Each peak portion 109 has a substantially triangular cross-sectional shape, and the cross-sectional shape surrounds the entire periphery of the columnar portion 109 . The maximum outer diameter of each peak portion 109 is larger than the inner diameter of the gauge insertion port 102 , and each peak portion 109 has an interference with respect to the gauge insertion port 102 . Therefore, when the oil level gauge 103 is attached to the gauge insertion port 102 , each peak 109 always receives a compressive load from the inner peripheral surface of the gauge insertion port 102 .

When checking the amount of oil, the operator hooks the hook 107 of the attached oil level gauge 103 with a finger and pulls out the oil level gauge 103 from the gauge insertion port 102 . Since the tip of the gauge portion 105 was immersed in oil, the oil adheres to the tip of the gauge portion 105 immediately after the oil level gauge 103 is pulled out from the gauge insertion port 102 . The operator checks the state of adhesion of oil to the gauge portion 105, that is, the position of the upper end (the end on the side of the rubber plug portion 104) of the portion where the oil is adhered, thereby removing the oil stored in the oil pan. It can be determined whether the amount is within the appropriate range. After confirming the amount of oil, the operator inserts the oil level gauge 103 into the gauge insertion port 102 to return the oil level gauge 103 to the installed state.

JP 2017-161229 A

When the internal pressure of the transmission case 101 increases, the internal pressure may push up the oil level gauge 103 and cause the rubber plug portion 104 to come out of the gauge insertion port 102 . In the conventional structure, the release pressure when the internal pressure rises must be supported only by the friction between the crest 109 and the inner peripheral surface of the gauge insertion port 102, and it is necessary to set the tightening margin of the crest 109 large. .

In addition, when the oil level gauge 103 is attached, the peaks 109 of the rubber plug portion 104 are constantly receiving a compressive load. Therefore, the peak portion 109 is deformed and deteriorated over time, the interference of the peak portion 109 is reduced, and the oil level gauge 103 is easily removed. Therefore, in the conventional configuration, it is necessary to set the tightening allowance in consideration of the secular change of the peak portion 109 .

As the tightening margin of the peak portion 109 increases, the load when inserting and removing the oil level gauge 103 from the gauge insertion port 102 increases, and the workability of checking the amount of oil deteriorates.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transmission capable of suppressing the oil level gauge from slipping out of the gauge insertion port without increasing the tightening allowance of the crest.

In order to achieve the above object, the transmission according to the present invention comprises a case having a gauge insertion opening, and oil stored in the case, which is provided so as to be removable from the outside of the case into the gauge insertion opening. and an oil level gauge for checking the amount of oil, the oil level gauge has a plug that is inserted into the gauge insertion port and closes the gauge insertion port, and the plug has a plurality of peaks for the gauge They are arranged side by side in the direction of insertion with respect to the insertion port, and the crests form an annular shape that protrudes in a direction perpendicular to the direction of insertion. The ridge is provided so that it can be pulled out from the gauge insertion port into the case in a state where the plug blocks the gauge insertion port, and the gauge insertion port is located at the end on the inner side of the case and extends toward the inner side. It has a tapered surface that slopes to increase the diameter.

According to this configuration, the oil level gauge is inserted from the outside of the case into the gauge insertion opening formed in the case. The oil level gauge is provided with a plug that closes the gauge insertion port. A plurality of ridges are formed in the plug portion so as to be aligned in the insertion direction with respect to the gauge insertion port. The crest forms an annular shape that protrudes in a direction orthogonal to the insertion direction, and has an interference with the gauge insertion port. As a result, in a state in which the plug is inserted into the gauge insertion port, the peaks are pressed against the inner peripheral surface of the gauge insertion port, and the gauge insertion port is liquid-tightly closed by the plug.

When the gauge insertion opening is closed by the plug portion, the peak portion at the most downstream end in the insertion direction is pulled out from the gauge insertion opening into the case. Therefore, when the internal pressure inside the case rises and the oil level gauge is pushed by the internal pressure in the direction away from the gauge insertion port, the crest that is out of the gauge insertion port will become the gauge insertion port. It abuts on the peripheral edge and prevents the oil level gauge from moving further in the disengagement direction. As a result, it is possible to prevent the oil level gauge from slipping out of the gauge insertion port.

Also, when the oil level gauge is installed by being inserted into the gauge insertion port, the ridges at the most downstream end in the insertion direction are removed from 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 makes it possible for the operator to feel that the installation of the oil level gauge in the gauge insertion port has been completed.

Further, the gauge insertion port has a tapered surface at the end on the inner side of the case so that the diameter increases toward the inner side. In a configuration in which the gauge insertion port does not have the tapered surface, when the oil level gauge moves in the direction away from the gauge insertion port, the edge on the inner side of the gauge insertion port reaches the maximum in the insertion direction. By biting into the peaks at the downstream end, the peaks may be damaged. On the other hand, in the configuration in which the gauge insertion port has a tapered surface, when the oil level gauge moves in the direction away from the gauge insertion port, the inner edge of the gauge insertion port is the maximum in the insertion direction. It is possible to suppress biting into the ridges at the downstream end, and to suppress damage to the ridges.

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

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. FIG. 2 is a side view of the configuration shown in FIG. 1 as seen from the vehicle width direction; It is a side view of an oil level gauge. FIG. 4 is a cross-sectional view showing the configuration of the gauge insertion port, showing a state in which an oil level gauge is attached to the gauge insertion port; FIG. 5 is a cross-sectional view showing the configuration of the gauge insertion port, showing a state in which the oil level gauge has slightly moved in the detachment direction from the state shown in FIG. 4; FIG. 4 is an enlarged cross-sectional view showing the outer end of the gauge insertion port and the vicinity of the dust entry prevention portion; FIG. 4 is an enlarged cross-sectional view showing a state in which the peaks of the oil level gauge are in contact with the tapered surface of the gauge insertion port; FIG. 4 is an enlarged cross-sectional view showing a state in which the peaks of the oil level gauge are in contact with the tapered surface of the gauge insertion port; FIG. 4 is a cross-sectional view showing a state in which the oil level gauge is being inserted into the gauge insertion port; FIG. 5 is a cross-sectional view showing a configuration in which the gauge insertion port does not have a tapered surface; FIG. 10 is a perspective view showing how the oil level gauge is attached to the gauge insertion port during factory work; FIG. 10 is a cross-sectional view showing a conventional oil level gauge and a structure around the oil level gauge in a transmission case;

BEST MODE FOR CARRYING OUT THE INVENTION Below, 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 one embodiment of the present invention and a portion of an automatic transmission 1 provided with the oil level gauge 6. FIG. FIG. 2 is a side view of the configuration shown in FIG. 1 as seen from the vehicle width direction.

The automatic transmission 1 is arranged in the front engine compartment of the vehicle 2 and on the right side of a 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. A power split type continuously variable transmission, for example, is equipped with a belt-type continuously variable transmission mechanism that changes the power steplessly by changing the gear ratio, and divides the power into two paths between the input shaft and the output shaft. It is a transmission that can be transmitted by

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

Further, the automatic transmission 1 is provided with an oil level gauge 6 for checking whether 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 exposed inside the tire housing when the left front wheel 3 is steered to the left. Above the position of the oil level gauge 6, as shown in FIG. 2, a side member 7 extends in the front-rear direction, and in front of the position of the oil level gauge 6 is a radiator hose 9 connected to a radiator 8. extends vertically.

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

The oil level gauge 6 has 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 such as rubber, and are integrally formed by molding.

The plug portion 11 is rotationally symmetrical about a center line extending in the longitudinal direction of the oil level gauge 6 . Three peaks 21, 22 and 23 are formed in the plug portion 11 so as to be aligned in the center line direction. Each of the peaks 21 , 22 , 23 has a triangular cross-sectional shape that protrudes outward in the radial direction, and the triangular cross-sectional shape forms an annular shape that extends over the entire periphery of the plug portion 11 in the circumferential direction. The two peaks 21 and 22 are arranged in this order from one side in the centerline direction and are formed in the same shape. The remaining one peak portion 23 is provided on the other side of the center line direction with respect to the peak portions 21 and 22 and is formed in a shape different from that of the two peak portions 21 and 22 . A specific shape of the peak portion 23 will be described later.

A flat, substantially cylindrical dust entry prevention portion 24 is formed on one side of the peak portion 21 in the center line direction of the plug portion 11 .

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

The cap portion 13 is provided on one side of the plug portion 11 in the centerline direction. The cap portion 13 has a flat, substantially columnar shape and is formed to have a larger diameter than the dust entry prevention portion 24 of the plug portion 11 .

The holding portion 14 is provided on one side of the cap portion 13 in the centerline direction. The clamping portion 14 includes a trunk portion 31 continuous with the cap portion 13 and a head portion 32 continuous with the trunk portion 31 . The trunk portion 31 has a cylindrical central portion in the center line direction, and has one end and the other end in the center line direction that increase in diameter toward the ends. The head 32 has a cylindrical side surface and a spherical end surface 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 circumference of one edge of the body portion 31 in the center line direction.

<Configuration of Gauge Insertion Port>
FIG. 4 is a cross-sectional view showing the configuration of the gauge insertion port 41, showing a state in which the oil level gauge 6 is attached to the gauge insertion port 41. As shown in FIG. FIG. 5 is a cross-sectional view showing the configuration of the gauge insertion port 41, showing a state in which the oil level gauge 6 has slightly moved in the direction of removal from the state shown in FIG.

A gauge insertion port 41 is formed in a portion of the transmission case 4 that faces the bottom surface of the oil pan 5 . The gauge insertion port 41 penetrates the transmission case 4 and communicates the inside and outside of the transmission case 4 with each other.

The gauge insertion port 41 also has a cylindrical inner peripheral surface 42 . The outer end of the gauge insertion port 41 is chamfered, and the gauge insertion port 41 continues to the outer side of the inner peripheral surface 42 and is inclined so that the diameter increases toward the outer side. It has a tapered surface 43 that The inner end of the gauge insertion port 41 is also chamfered in the same manner as the outer end, and the gauge insertion port 41 is continuous with the inner side of the inner peripheral surface 42. , and has a tapered surface 44 that is inclined so as to increase in diameter toward the inner side.

<Installation of oil level gauge>
The oil level gauge 6 is inserted into the gauge insertion port 41 from the outside of the transmission case 4 with the gauge portion 12 facing inside 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 abuts the transmission case 4, the oil level gauge 6 is inserted into the gauge insertion port 41 beyond that. , and the oil level gauge 6 is attached to the gauge insertion port 41.例文帳に追加

In this attached state, the two ridges 21 and 22 of the plug portion 11 and the dust entry prevention portion 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 interference with respect to the gauge insertion port 41 . Therefore, when the oil level gauge 6 is attached to 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 closed. It is liquid-tightly closed by the portion 11 .

Moreover, the maximum outer diameter of the peak portion 23 is the same as the maximum outer diameter of the peak portions 21 and 22 and is larger than the inner diameter of the inner peripheral surface 42 of the gauge insertion port 41 . However, when the oil level gauge 6 is attached to the gauge insertion port 41 , the peak portion 23 is pulled out from the gauge insertion port 41 into the transmission case 4 , and the inner peripheral surface 42 of the gauge insertion port 41 and not in contact.

Therefore, even if the internal pressure in the transmission case 4 rises and the oil level gauge 6 is pushed by the internal pressure in a direction away from the gauge insertion port 41, the gauge insertion port 41 will remain open as shown in FIG. The peak 23 coming out of the gauge insertion port 41 abuts against 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.

Further, when the oil level gauge 6 is attached to the gauge insertion port 41 , the tip of the gauge portion 12 is immersed in the oil stored in the oil pan 5 . Since the tip of the gauge portion 12 is immersed in oil, the operator pulls out the oil level gauge 6 from the gauge insertion port 41 and checks the state of oil adhesion to the gauge portion 12, that is, the upper end of the portion where the oil adheres. By confirming the position of (the end on the plug portion side), it is possible to determine whether or not 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 portion 24. As shown in FIG.

The outer diameter of the dust entry prevention 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 attached to the gauge insertion port 41, the dust entry prevention portion 24 leaves a minute gap G between itself and the inner peripheral surface 42 of the gauge insertion port 41, and the inner peripheral surface 42 and a tapered surface 43 continuous to the outside thereof.

In an oil level gauge without the dust entry prevention portion 24, there is a large space between the oil level gauge and the inner peripheral surface 42 and the tapered surface 43 of the gauge insertion port 41, as indicated by the broken line in FIG. occur. In comparison, since the oil level gauge 6 is provided with the dust entry prevention portion 24, 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. Volume is reduced.

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

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 peak portion 23 formed on 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, and is connected to the outside. It has an outer side tapered surface 52 whose diameter decreases toward the side, and an inner side tapered surface 53 which continues to the inner side (the other side in the center line direction) of the central side surface 51 and whose diameter decreases toward the inner side. 7, the outer tapered surface 52 of the peak portion 23 is inclined at an angle .beta.1 with respect to the inner tapered surface 44 of the gauge insertion port 41. As shown in FIG. 8, the inner side tapered surface 53 of the peak portion 23 is inclined at an angle .beta.2 smaller than the angle .beta.1 with respect to the outer side tapered surface 43 of the gauge insertion port 41. As shown in FIG.

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

<Effect>
As described above, even if the internal pressure in the transmission case 4 rises and the oil level gauge 6 is pushed in the direction away from the gauge insertion port 41 by the internal pressure, the gauge will still remain as shown in FIG. The peak 23 coming out of the insertion port 41 abuts against 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, the 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 away from the gauge insertion port 41 , the gauge insertion port 41 If the edge on the inner side of the ridge portion 23 bites into the ridge portion 23, the ridge portion 23 may be damaged. 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 the direction away from the gauge insertion port 41 , the inner edge of the gauge insertion port 41 is Biting into the ridges 23 can be suppressed, and damage to the ridges 23 can be suppressed.

A tapered surface 43 is also formed at the outer end of the gauge insertion port 41 so as to increase in diameter toward the outer side. As a result, when the oil level gauge 6 is inserted into the gauge insertion port 41, the outer edge of the gauge insertion port 41 can be prevented from biting into the ridges 23, and damage to the ridges 23 can be suppressed. can.

Further, the tapered surface 52 on the outer side of the peak portion 23 is inclined at an angle β1 with respect to the tapered surface 44 on the inner side of the gauge insertion port 41 , and the tapered surface 53 on the inner side of the peak portion 23 is inclined at an angle is inclined at an angle β2 smaller than the angle β1 with respect to the tapered surface 43 on the outer side of the . As a result, a large load is required for deformation of the ridges 23 when the ridges 23 come into contact with the tapered surface 44 on the inner side of the gauge insertion opening 41 while the oil level gauge 6 is being removed from the gauge insertion opening 41 . On the other hand, while the oil level gauge 6 is being inserted into the gauge insertion port 41, the load required to deform the peak portion 23 when the peak portion 23 abuts against the tapered surface 43 on the outside of the gauge insertion port 41. becomes smaller. As a result, when the internal pressure in the transmission case 4 rises, the load of the oil level gauge 6 coming out of the gauge insertion port 41 is large, and the oil level gauge 6 can be effectively suppressed from coming out of 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.例文帳に追加

Further, when the oil level gauge 6 is attached to the gauge insertion port 41, the peak portion 23 is restored in response to the removal of the peak portion 23 from the gauge insertion port 41, and vibration caused by the restoration is transmitted to the operator. transmitted to the hands of As a result, the operator can feel that the installation of the oil level gauge 6 to the gauge insertion port 41 is completed.

A dust entry prevention portion 24 is provided in the oil level gauge 6 , and when the oil level gauge 6 is attached to the gauge insertion port 41 , the dust entry prevention portion 24 is provided on the inner peripheral surface 42 of the gauge insertion port 41 . A small gap G is provided between the inner peripheral surface 42 and the tapered surface 43 continuous to the outer side thereof. As a result, as shown in FIG. 6, even if there is a gap between the cap portion 13 of the oil level gauge 6 and the transmission case 4, dust can be prevented from entering the gauge insertion port 41 through the gap. .

Since entry of dust into the gauge insertion port 41 is suppressed, 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 getting 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 . As a result, the peaks 21 and 22 and the inner peripheral surface 42 of the gauge insertion port 41 are damaged by dust, and the gap between the peaks 21 and 22 and the inner peripheral surface 42 of the gauge insertion port 41 due to the entrapment of dust. , and oil leakage from the gauge insertion port 41 can be suppressed.

In addition, since the dust entry prevention portion 24 is provided, 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 is reduced. Even if dust enters the inlet 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 during the confirmation work of the oil amount.

Furthermore, since the outer diameter of the dust entry prevention portion 24 is slightly smaller than the inner diameter of the inner peripheral surface 42 of the gauge insertion port 41 , the dust entry prevention portion 24 prevents the oil level gauge 6 from being inserted into and removed from the gauge insertion port 41 . It does not affect the load when Therefore, it is possible to ensure good workability when checking the amount of oil.

The clamping portion 14 of the oil level gauge 6 includes a trunk portion 31 and a head portion 32 continuous with the trunk portion 31 . The trunk portion 31 has a cylindrical central portion in the center line direction, and has one end and the other end in the center line direction that increase in diameter toward the ends. Therefore, even if there is an obstacle such as the side member 7 around the oil level gauge 6 attached to the gauge insertion port 41, the operator can easily move the body 31 as shown in FIGS. can be picked up 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 body 31 with two fingers to lift the body 31 . In addition, the operator can insert the oil level gauge 6 into the gauge insertion port 41 by pushing down the trunk portion 31 by moving the wrist while pinching the trunk portion 31 with two fingers. Therefore, even when accessing from the tire housing of the vehicle 2 , the oil level gauge 6 can be satisfactorily inserted into and pulled out of the gauge insertion port 41 .

In addition, since the body part 31 is formed in a rotationally symmetrical shape around the center line, it is not necessary to adjust the direction of the body part 31 when the body part 31 is picked up with two fingers of the working vehicle.

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

Further, since the plug portion 11, the cap portion 13 and the clamping portion 14 are made of an elastically deformable material, when the operator pulls out the oil level gauge 6 from the gauge insertion port 41, the plug portion 11, the cap portion 13 and the clamping portion 14 can be pulled out. By deforming the portion 14, the oil level gauge 6 can be drawn obliquely to the front. Even when an 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.例文帳に追加Therefore, even if there is an obstacle around the oil level gauge 6, the oil level gauge 6 can be easily inserted into or removed from the gauge insertion port 41 by avoiding interference between the obstacle and the oil level gauge 6.例文帳に追加can be done.

Since the head 32 has a surface that extends over the entire circumference 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. In addition, the operator can push the head 32 from above with the thumb of the hand. Therefore, the operator can easily apply force to the oil level gauge 6, the operator's work fatigue can be reduced, and the work speed can be improved.

Incidentally, in the conventional structure shown in FIG. 12, for example, after the gauge portion 105 and the hook portion 107 are riveted together, they are set in the molds for the rubber plug portion 104 and the cap portion 106 to form the rubber plug. A portion 104 and a cap portion 106 are formed. On the other hand, the oil level gauge 6 does not require riveting before setting the gauge portion 12 to the molding die for the plug portion 11, the cap portion 13 and the clamping portion 14, so that the manufacturing cost can be reduced.

<Modification>
Although one embodiment of the present invention has been described above, the present invention can also be implemented in other forms. It is possible to apply

4: Transmission case (case)
6: Oil level gauge 11: Plug portion 21, 22, 23: Mountain portion 41: Gauge insertion port 44: Tapered surface

Claims (1)

a case in which a gauge insertion port is formed;
an oil level gauge provided to be removably inserted into the gauge insertion port from the outside of the case for checking the amount of oil stored in the case,
The oil level gauge includes a plug portion that is inserted into the gauge insertion port to block the gauge insertion port,
A plurality of ridges are formed in the plug portion in an insertion direction with respect to the gauge insertion opening , and a columnar column is formed on the upstream side in the insertion direction with respect to the ridges at the most upstream end in the insertion direction. A shaped dust entry prevention part is formed,
The peak portion has an annular shape that protrudes in a direction perpendicular to the insertion direction, and has an interference with the gauge insertion port,
The peak portion at the most downstream end in the insertion direction is provided so as to pass through the gauge insertion opening into the case in a state where the plug closes the gauge insertion opening, and is upstream in the insertion direction. having an outer ridge tapered surface whose diameter decreases toward the side and an inner ridge tapered surface whose diameter decreases toward the downstream side in the insertion direction;
The gauge insertion port has an inner side insertion tapered surface at the end on the inner side of the case, and is tapered so as to increase in diameter toward the inside of the case. having an outer side insertion tapered surface that is inclined so as to increase in diameter toward the outer side,
The dust entry prevention portion has an outer diameter smaller than the inner diameter of the inner peripheral surface of the gauge insertion port and an outer diameter larger than the minimum diameter between the adjacent peak portions, and the plug portion has the A transmission facing the inner peripheral surface and the tapered surface of the outer side insertion port with a gap between them and the inner peripheral surface in a state where the gauge insertion port is closed.

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