JP3134300U - Oil gauge device - Google Patents

Abstract

An object of the present invention is to clean the inside of a gauge tube without emptying a tank.
An oil gauge device includes a gauge pipe 11 made of a transparent resin extending in a vertical direction, an upper joint 12 provided at an upper end of the gauge pipe 11, and a lower pipe provided at a lower end of the gauge pipe 11. And a joint 13. A communication hole 12a that is formed in the upper joint 12 so that its axis coincides with the axis of the gauge pipe 11 and communicates with the gauge pipe 11, and the communication hole 12a that is detachably attached to and attached to the communication hole 12a is sealed. And a sealing body 14 configured to be stoppable. The communication hole 12a is a female screw hole, and the sealing body 14 is a male screw screwed into the communication hole 12a. The hole diameter of the communication hole 12a is formed to be larger than the inner diameter of the gauge tube 11, and the gauge tube 11, the upper joint 12, and the lower joint 13 are integrally formed by injection molding.
[Selection] Figure 1

Description

  The present invention is for detecting the position of a liquid level such as fuel stored in a fuel tank, hydraulic oil stored in a tank of a hydraulic device, or lubricating oil stored in a device such as a reduction gear from the outside. The present invention relates to an oil gauge device.

  2. Description of the Related Art Conventionally, equipment equipped with an engine is provided with a tank that stores the fuel. In addition, when the equipment is provided with a reduction gearbox or a hydraulic device that decelerates the rotation of the engine, lubricating oil is stored in the reduction gearbox, and a hydraulic oil tank is stored in the hydraulic device. Is provided. Further, in a machine tool or the like that does not include an engine, a cutting oil is flowed to the processing portion in order to remove heat generated during processing such as cutting and facilitate the processing. In view of this, it is known that these machines and the like are provided with a tank for storing cutting oil. These fuels, lubricating oils, hydraulic oils, and cutting oils vary in their amounts according to the operating conditions of equipment and machines, and it is desirable that appropriate amounts are always stored. And in order to know the quantity of fuel, lubricating oil, etc. stored in a tank or the like, an oil gauge device is known for detecting the position of the liquid level from the outside.

  As shown in FIG. 6, the oil gauge device is provided with a gauge pipe 3 made of a transparent resin such as vinyl chloride provided in the vertical direction outside the side wall of the tank 2 and the like, and at the upper end of the gauge pipe 3. Further, there has been known one provided with an upper joint 4 and a lower joint 5 provided at the lower end of the gauge tube 3 (see, for example, Patent Document 1). In this oil gauge device, a gauge stay 6, which is a separate member from the gauge tube 3, is attached to a member near the tank 2, and the linear gauge tube 3 is supported on the gauge stay 6 in the vertical direction. ing. That is, the upper joint 4 is attached to the upper support portion 6 a of the gauge stay 6, and the lower joint 5 is attached to the lower support portion 6 b of the gauge stay 6, and another member is interposed between the upper joint 4 and the lower joint 5. The gauge tube 3 is connected.

On the other hand, an upper nozzle 2 a communicating with the inside is provided at the upper part of the tank 2, one end of the upper connecting pipe 7 is connected to the upper nozzle 2 a, and the other end of the upper connecting pipe 7 is connected to the upper joint 4. . The upper joint 4 includes a tank-side nozzle 4a and a lower nozzle 4b that communicates with the tank-side nozzle 4a and into which the upper end of the gauge pipe 3 is fitted. The upper end of the gauge pipe 3 is communicated with the inside of the tank 2 through the upper connecting pipe 7 and the upper joint 4. On the other hand, a lower nozzle 2 b communicating with the inside is provided at the lower part of the tank 2, one end of the lower connecting pipe 8 is connected to the lower nozzle 2 b, and the other end of the lower connecting pipe 8 is connected to the lower joint 5. . The lower joint 5 includes a tank-side nozzle 5a and an upper nozzle 5b that communicates with the tank-side nozzle 5a and into which the lower end of the gauge pipe 3 is fitted. The lower end of the gauge pipe 3 is communicated with the inside of the tank 2 through the lower connecting pipe 8 and the lower joint 5. In the oil gauge device having such a configuration, part of the fuel in the tank 2 enters the gauge pipe 3 through the lower connecting pipe 8 and the lower joint 5, and the tank 2 is driven by the liquid level of the fuel that has entered the cage pipe 3. The position of the liquid level of fuel or the like stored in the tank 2 can be detected from the outside.
JP 2002-90205 A (specifications [0004] to [0006], FIG. 1)

However, in the conventional oil gauge device, the fuel or the like that has entered the cage pipe 3 adheres to the inside of the gauge pipe 3, and the position of the liquid level of the fuel or the like that has entered the gauge pipe 3 is confirmed. This could make it difficult, and it was necessary to periodically replace or clean the oil gauge device. Then, when cleaning or replacing the oil gauge device, the gauge tube 3 itself must be removed, and at that time, fuel, oil, etc. are prevented from flowing out from the nozzles 2a, 2b provided in the tank 2 or the like. For this reason, there is an inconvenience that the operation of the equipment must be stopped once, the fuel and oil in the tank 2 are drained, and the inside of the tank 2 is emptied.
An object of the present invention is to provide an oil gauge device capable of cleaning the inside of a gauge pipe without emptying a tank.

As shown in FIG. 1, the device according to claim 1 includes a gauge tube 11 made of transparent resin extending in the vertical direction, an upper joint 12 provided at the upper end of the gauge tube 11, and a gauge tube 11. This is an improvement of an oil gauge device including a lower joint 13 provided at the lower end.
The characteristic configuration is that the shaft center coincides with the axis of the gauge tube 11 and is formed in the upper joint 12 so as to communicate with the gauge tube 11, and a state in which the gauge tube 11 is removably attached to and attached to the communication hole 12a. And the sealing body 14 configured to be able to seal the communication hole 12a.

  In the oil gauge device according to the first aspect, when cleaning the inside of the cage tube 11, as shown in FIG. 2, the sealing body 14 is removed from the communication hole 12a and the communication hole 12a is opened. The inside of the gauge tube 11 can be cleaned through the open communication hole 12a. For this reason, it becomes possible to clean the gauge tube 11 without removing the gauge tube 11 and eliminate the complicated work of draining fuel and oil inside the tank and the like each time the gauge tube is cleaned. be able to.

The device according to claim 2 is the device according to claim 1, wherein the communication hole 12a is a female screw hole, and the sealing body 14 is a male screw screwed into the communication hole 12a.
In the oil gauge device according to the second aspect, the communication hole 12a can be sealed only by screwing the male screw 14 as a sealing body into the female screw hole 12a as the communication hole. Further, the male screw 14 as the sealing body can be removed from the female screw hole 12a as the communication hole by simply rotating it around the central axis. For this reason, the communication hole 12a required when the gauge tube 11 is cleaned can be opened by a relatively simple operation by simply rotating the male screw 14.

The invention according to claim 3 is the invention according to claim 1 or 2, wherein the hole diameter of the communication hole 12a is greater than the inner diameter of the gauge pipe 11, and the gauge pipe 11, the upper joint 12 and the lower joint 13 are injection molded. It is characterized by being integrally formed by.
Considering that the upper joint 12, the gauge tube 11, and the lower joint 13 are integrally formed by injection molding, there is a problem in the pulling direction of the rod-shaped mold for forming the through hole 11a of the gauge tube 11 located in the middle. Become. However, in the device according to the third aspect, since the hole diameter of the communication hole 12a is formed to be equal to or larger than the inner diameter of the gauge tube 11, a rod-shaped mold for forming the through hole 11a can be pulled out through the communication hole 12a. it can. Therefore, the upper joint 12, the gauge tube 11, and the lower joint 13 can be integrally formed by injection molding, and the molding operation is relatively easy as compared with the conventional case in which they are made of separate members. An inexpensive oil gauge device 10 can be obtained.

The device according to claim 4 is the device according to claim 3, wherein an upper through hole 12b orthogonal to the gauge tube 11 is formed in the upper joint 12, and a lower through hole 13b orthogonal to the gauge tube 11 is formed in the lower joint 13. Are further provided with mounting screws 21 respectively inserted into the upper through-hole 12b and the lower through-hole 13b, and the gauge pipe 11 is vertically moved by the upper joint 12 and the lower joint 13 attached via the respective mounting screws 21. It is configured to be attached.
In the oil gauge device according to the fourth aspect, the upper joint 12 and the lower joint 13 can be directly attached by the attachment screw 21. For this reason, it is possible to eliminate the need for a conventional mounting stay, and to obtain an inexpensive oil gauge device.

The device according to claim 5 is the device according to claim 4, wherein the upper end of the gauge tube 11 is formed to communicate with the upper through hole 12b, and the lower end of the gauge tube 11 is formed to communicate with the lower through hole 13b. When the mounting screw 21 inserted through the upper through hole 12b and the lower through hole 13b is screwed into the female screw hole 17b formed in the side wall 17a of the tank 17, the upper through hole 12b and the lower through hole pass through the inside of the tank 17. An oil passage 22 communicating with the hole 13b is formed in the mounting screw 21.
In the oil gauge device according to claim 5, the inside of the tank 17 is connected to the gauge tube 11 by a relatively simple operation of simply attaching the upper joint 12 and the lower joint 13 to the side wall 17 a of the tank 17 by the mounting screw 21. Can communicate. For this reason, it is possible to eliminate the need for a connecting pipe that is conventionally required to communicate the inside of the tank with the gauge pipe.

The device according to claim 6 is the device according to claim 5, wherein the mounting screw 21 has a head portion 21a and a screw portion 21b whose base end is connected to the head portion 21a, and the shaft center of the screw portion 21b. A transverse hole 22a formed so as to cross the threaded part 21b at right angles and the threaded part 21b formed along the axis of the threaded part 21b. An oil passage 22 is formed by the communicating shaft hole 22b.
In the oil gauge device according to the sixth aspect, a so-called hexagon bolt can be used as the mounting screw 21 of the present invention by processing a conventional so-called hexagon bolt, and the unit price of the mounting screw 21 is suppressed from being pushed up. can do.

  In the oil gauge device of the present invention, a communication hole communicating with the gauge pipe formed in the upper joint with the axis center coincided with the axis of the gauge pipe, and the communication in a state where it is removably attached to and attached to the communication hole. Since the hole is provided with a sealing body configured to be able to seal, when cleaning the inside of the cage tube, the sealing body is removed from the communication hole, and the communication hole is opened. The inside of the gauge tube can be cleaned through the hole. For this reason, it becomes possible to clean the gauge tube without removing the gauge tube, and it is possible to eliminate the complicated work of draining fuel and oil inside the tank etc. every time the gauge tube is cleaned. it can.

  In this case, if the communication hole is a female screw hole and the sealing body is a male screw screwed into the communication hole, the comparison is simply made by rotating the male screw as the sealing body from the female screw hole as the communication hole and removing it. The communication hole necessary for cleaning the gauge tube can be opened with a simple operation. If the hole diameter of the communication hole is made larger than the inner diameter of the gauge pipe and the gauge pipe, the upper joint and the lower joint are integrally formed by injection molding, a relatively inexpensive oil gauge device can be obtained.

  In addition, the mounting screw is inserted into the upper through hole formed in the upper joint and the lower through hole formed in the lower joint, and the gauge tube is vertically moved by the upper joint and the lower joint attached through the respective mounting screws. If it is made to attach, the attachment stay conventionally required can be made unnecessary. In addition, if the mounting screw is formed with an oil passage that connects the inside of the tank to the upper through hole and the lower through hole when the mounting screw is screwed into the female screw hole formed on the side wall of the tank, the mounting screw can The inside of the tank can be communicated with the gauge pipe by a relatively simple operation in which the lower joint is attached to the side wall of the tank. For this reason, it is possible to eliminate the connection pipe that has been conventionally required for communicating the inside of the tank with the gauge pipe, and it is possible to obtain an inexpensive oil gauge device.

Next, the best mode for carrying out the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, an oil gauge device 10 of the present invention includes a gauge pipe 11 made of a transparent resin provided extending in the vertical direction, and an upper joint 12 provided at the upper end of the gauge pipe 11. And a lower joint 13 provided at the lower end of the gauge tube 11. The gauge tube 11 is provided with a hole 11 a having a circular cross section in the axial direction, and a communication hole 12 a communicating with the hole 11 a passing through the gauge tube 11 is formed in the upper joint 12. The communication hole 12 a is a female screw hole whose axis is aligned with the axis of the gauge tube 11, and is formed to be larger than the cross-sectional shape of the through hole 11 a formed in the gauge tube 11. A male screw 14 is screwed into the communication hole 12 a made up of the female screw hole, and the male screw 14 seals the communication hole 12 a made up of the female screw hole, and the through hole 11 a inside the gauge tube 11 from the communication hole 12 a. This prevents dust and the like from entering the battery. In addition, the male screw 14 shown in the figure indicates a bolt with a hole made of a resin molded product.

  Further, in the oil gauge device 10, by forming a female screw hole 11a larger than the inner diameter of the gauge tube 11, the upper joint 12, the gauge tube 11, and the lower joint 13 are integrally formed by injection molding. That is, considering that the upper joint 12, the gauge tube 11, and the lower joint 13 are integrally formed by injection molding, a rod-shaped mold for forming a through hole 11a penetrating the center of the gauge tube 11 located in the middle. Must be pulled out from the through-hole 11a after the molding, and the pulling direction of the rod-shaped mold becomes a problem. However, in the oil gauge device 10 of the present invention, the upper joint 12 is formed with the communication hole 12a formed of a female screw hole larger than the cross-sectional shape of the through hole 11a, so that this communication is performed after forming a rod-shaped mold for forming the through hole 11a. It can be pulled out through the hole 12a. Therefore, the upper joint 12, the gauge tube 11, and the lower joint 13 can be integrally formed by injection molding, and the molding operation is relatively easy, so that a relatively inexpensive oil gauge device 10 can be obtained. become. Here, the gauge tube 11 is required to be made of a transparent resin, and preferably has chemical resistance. For this reason, examples of the resin to be injection-molded include polycarbonate (PC) and acrylic resin.

  As shown in FIGS. 1 to 5, a colored plate 16 is attached to the gauge tube 11. The oil gauge device 10 in this embodiment is one that is directly attached to the outer wall 17a of the tank 17, and the colored plate 16 is attached to the back side of the gauge tube 11 that is the tank 17 side. The colored plate 16 is a white plate that is long and vertically long and formed by molding a colored resin. A small hole 16a for positioning is formed at the top and bottom of the center in the width direction. Here, the colored plate 16 is preferably white, but is not limited to white. And as a white resin for obtaining this colored board 16 by injection molding, a polystyrene resin (PS) is illustrated.

  As shown in FIGS. 3 to 5, the gauge tube 11 has a skirt portion 18 that sandwiches the colored plate 16 from the width direction at the tip, and projects from both sides of the gauge tube 11 in the width direction so as to be integrated with the gauge tube 11. It is formed. The skirt portion 18 is formed over the entire length of the gauge tube 11, and the upper and lower ends thereof are connected to the upper joint 12 and the lower joint 13 to improve the mechanical strength of the gauge tube 11. Further, bosses 11b that are inserted into the small holes 16a of the colored plate 16 project from the upper and lower portions of the back side of the gauge tube 11. Then, when the colored plate 16 is attached to the gauge tube 11 so that the boss 11b is inserted into the small hole 16a, the skirt portion 18 sandwiches the colored plate 16 from both sides at the tip edge thereof. The skirt portion 18 is configured to cover.

  A colored belt 19 is wound around both the upper end and the lower end of the gauge tube 11. The colored belt 19 is a U-shaped member made by molding colored resin, and a groove 11c into which the colored belt 19 is inserted is formed on the upper side and the lower end of the gauge tube 11 on the front side. . The colored belt 19 is preferably made by molding a resin that can be toned in a color that attracts people's attention, such as red, and the trade name is known as “Duracon”. POM (polyacetal resin) is exemplified.

  As shown in FIG. 4, a locking hole 18a through which both ends of the colored belt 19 are inserted is formed in the skirt portion 18 continuous with the groove 11c. The colored belt 19 is formed so as to be attachable to the groove 11c, and in the state of being attached to the groove 11c, both ends of the colored belt 19 are inserted into the locking holes 18a and locked to the edge of the locking hole 18a. Thus, key claws 19a for prohibiting detachment from the groove 11c are formed at both ends of the colored belt 19, respectively. Accordingly, the colored belt 19 made of a U-shaped member is mounted in the groove 11c in a state in which the key claw 19a is locked to the hole edge of the locking hole 18a, whereby the colored belt 19 is attached to the gauge tube 11. Is configured to wind approximately three quarters of a turn.

  Returning to FIGS. 1 to 3, the upper joint 12 is formed with an upper through hole 12 b orthogonal to the gauge tube 11, and the lower joint 13 is formed with a lower through hole 13 b orthogonal to the gauge tube 11. The upper end of the gauge tube 11 is formed in communication with the upper through hole 12b, and the lower end of the gauge tube 11 is formed in communication with the lower through hole 13b. The upper through hole 12b and the lower through hole 13b are respectively inserted with mounting screws 21. The side wall 17a of the tank 17 corresponding to each through hole 11a penetrates the side wall 17a from the outside to the inside. A female screw hole 17b that communicates is formed. Then, the upper joint 12 and the lower joint 13 are screwed into the side wall 17a of the tank 17 by the mounting screws 21 by screwing the mounting screws 21 respectively inserted into the upper through holes 12b and the lower through holes 13b into the female screw holes 17b. The gauge pipe 11 formed integrally therewith is constituted by the upper joint 12 and the lower joint 13 which are attached and attached via the attachment screws 21 so as to be vertically attached therebetween.

  The mounting screw 21 in this embodiment is a so-called hexagon bolt having a head portion 21a made of a hexagonal column and a male screw portion 21b having a base end connected to the head portion 21a, and includes an upper through hole 12b and a lower through hole. When the mounting screws 21 inserted into the respective tanks 13 b are screwed into female screw holes 17 b formed in the side wall of the tank 17, the inside of the tank 17 is connected to the upper through hole 12 b in the upper joint 12 or the lower through hole 13 b in the lower joint 13. An oil passage 22 communicating with the mounting screw 21 is formed. The oil passage 22 in this embodiment includes a horizontal hole 22a formed so as to cross the male screw portion 21b perpendicular to the axis of the male screw portion 21b, and the male screw portion 21b along the axis of the male screw portion 21b. And is formed by a shaft hole 22b whose one end is open at the distal end of the male screw portion 21b and whose base end communicates with the lateral hole 22a. Then, O-rings 23 functioning as packings are attached to both ends of the upper through-hole 12b and the lower through-hole 13b through which the mounting screw 21 is inserted, and the upper through-hole 12b or the lower through-hole 13b is connected via the oil passage 22. The fuel or oil inside the tank 17 that has flowed into the tank is prevented from leaking outside.

  In the oil gauge device 10 configured as described above, a part of the fuel or oil in the tank 17 reaches the lower through hole 13b via the oil passage 22 formed in the mounting screw 21, and the gauge is passed through the lower through hole 13b. It penetrates into the tube 11. Since the cage tube 11 is made of a transparent resin, the position of the liquid level of the fuel or the like stored in the tank 17 from the outside of the tank 17 is detected from the position of the fuel or oil level that has entered the gauge tube 11. can do. At this time, in the oil gauge device 10 of the present invention, the white colored plate 16 is attached to the back side of the gauge tube 11 which is the tank 17 side, so that the fuel or oil that has entered the cage tube 11 is absorbed by the colored plate 16. The position of the liquid level can be recognized relatively easily when it is positioned on the front side. Further, since the colored belt 19 is wound around both the upper end and the lower end of the gauge tube 11, the gauge tube 11 is adjusted so that an appropriate amount is obtained by the presence of a liquid surface between the upper and lower colored belts 19. Is attached to the outer wall 17 a of the tank 17, it is possible to grasp an appropriate amount of fuel or the like stored in the tank 17 from the outside of the tank 17 from the position of the liquid level.

  On the other hand, fuel or oil that has entered the inside of the cage tube 11 may adhere to the inside of the gauge tube 11, and it may be difficult to confirm the position of the liquid level of the fuel or the like that has entered the inside of the gauge tube 11. If so, the inside of the gauge tube 11 is washed. As shown in FIG. 2, in this cleaning, first, the mounting screw 21 inserted through the upper through hole 12b and screwed into the side wall 17a of the tank 17 is removed. Since the mounting screw 21 inserted through the upper through-hole 12b is generally located above the liquid level of fuel or oil stored in the tank 17, the side wall 17a of the tank 17 is removed even if the mounting screw is removed. The internal fuel or the like does not leak from the female screw hole 17b formed in the above.

  Next, the sealing body 14 is removed from the communication hole 12a, and the communication hole 12a is opened. In this embodiment, since the communication hole 12a is a female screw hole and the sealing body 14 is a male screw screwed into the communication hole 12a, the male screw 14 that is a sealing body from the female screw hole 12a that is the communication hole. The communication hole 12a can be opened by a relatively simple operation by simply rotating and removing. Then, an object for cleaning the inside of the gauge tube 11, such as a cotton swab 24, is inserted into the open communication hole 12a, and the tip of the cotton swab 24 enters from the communication hole 12a to the inside of the gauge tube 11. Let Then, the tip or the like is pressed against the inner surface of the gauge tube 11 and moved to remove the fuel or the like adhering to the inner surface of the gauge tube 11, thereby cleaning the inner surface. For this reason, it becomes possible to clean the gauge tube 11 without removing the gauge tube 11 and eliminate the complicated work of draining fuel and oil inside the tank and the like each time the gauge tube is cleaned. be able to.

  After the cleaning, the mounting screw 21 is inserted into the upper through hole 12b and screwed into the female screw hole 17b formed in the side wall 17a of the tank 17, and the male screw 14 as a sealing body is a communication hole. A series of cleaning operations are completed by screwing into the female screw hole 12a and sealing the communication hole 12a.

It is the longitudinal cross-sectional view with which the oil gauge apparatus of embodiment of this invention was attached to the tank. It is sectional drawing corresponding to FIG. 1 which shows the state which removed the external thread which is the sealing body of the apparatus, and opened the communicating hole. It is the front view. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is a disassembled perspective view which shows the structure of the apparatus. It is a figure which shows the conventional oil gauge apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Oil gauge apparatus 11 Gauge pipe 12 Upper joint 12a Communication hole 12b Upper through-hole 13 Lower joint 13b Lower through-hole 14 Sealing body 17 Tank 17a Side wall 17b Female screw hole 21 Mounting screw 21a Head part 21b Screw part 22 Oil passage 22a Side hole 22b Shaft hole

Claims (6)

A gauge pipe (11) made of transparent resin provided extending in the vertical direction, an upper joint (12) provided at the upper end of the gauge pipe (11), and provided at the lower end of the gauge pipe (11). In the oil gauge device with the lower joint (13),
A communication hole (12a) that is formed in the upper joint (12) and communicates with the gauge tube (11) so that the axis coincides with the axis of the gauge tube (11).
An oil gauge device comprising: a sealing body (14) configured to be able to seal the communication hole (12a) in a state where the communication hole (12a) is detachably attached to and attached to the communication hole (12a).   The oil gauge device according to claim 1, wherein the communication hole (12a) is a female screw hole, and the sealing body (14) is a male screw screwed into the communication hole (12a).   The hole diameter of the communication hole (12a) is formed to be equal to or larger than the inner diameter of the gauge pipe (11), and the gauge pipe (11), the upper joint (12), and the lower joint (13) are integrally formed by injection molding. The oil gauge device according to 1 or 2. An upper through hole (12b) perpendicular to the gauge pipe (11) is formed in the upper joint (12), and a lower through hole (13b) perpendicular to the gauge pipe (11) is formed in the lower joint (13), It further comprises a mounting screw (21) inserted through the upper through hole (12b) and the lower through hole (13b),
The oil gauge according to claim 3, wherein the gauge pipe (11) is vertically attached by the upper joint (12) and the lower joint (13) attached via the respective attachment screws (21). apparatus.   The upper end of the gauge tube (11) is formed in communication with the upper through hole (12b), the lower end of the gauge tube (11) is formed in communication with the lower through hole (13b), and the upper through hole (12b) And when the mounting screws (21) respectively inserted into the lower through holes (13b) are screwed into the female screw holes (17b) formed in the side wall (17a) of the tank (17), the inside of the tank (17) The oil gauge device according to claim 4, wherein an oil passage (22) that communicates with the upper through hole (12b) and the lower through hole (13b) is formed in the mounting screw (21).   The mounting screw (21) has a head portion (21a) and a screw portion (21b) whose proximal end is connected to the head portion (21a), and the screw portion is perpendicular to the axis of the screw portion (21b). (21b) is formed in the threaded portion (21b) along the axial center of the threaded portion (22b) and the lateral hole (22a) formed so as to cross the end (21b), and one end is open at the tip of the threaded portion (21b) The oil gauge device according to claim 5, wherein an oil passage (22) is formed by a shaft hole (22b) whose base end communicates with the lateral hole (22a).

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