JP6942409B2 - Oil level gauge guide structure - Google Patents

Description

The present invention relates to a guide structure of an oil level gauge provided in a transmission or the like of a vehicle.

For example, in an automatic transmission, a clutch for connecting a rotating element and 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 brake. In addition, clutches, brakes, etc. must absorb the differential rotation between rotating elements, and require the supply of oil (lubricating oil) for lubrication.

Therefore, an oil pan for storing oil is attached to the bottom of the transmission case, which forms the outer shell of the automatic transmission. Then, 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 the valve body forming the hydraulic circuit.

If the amount of oil stored in the oil pan (the amount of oil in the transmission case) is too large, the stirring resistance during rotation of the rotating body (for example, differential gear) immersed in the oil will increase, resulting in energy loss. It causes deterioration of fuel efficiency due to the increase in fuel consumption. On the other hand, if the amount of oil stored in the oil pan is too small, the hydraulic pressure of the hydraulic oil and 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 biting. It may occur.

Therefore, as shown in FIG. 4, the automatic transmission is provided with an oil level gauge 91 so that it can be confirmed whether or not the amount of oil stored in the oil pan is within an appropriate range. There is.

A tube insertion port 93 is provided in a predetermined portion of the transmission case 92. The tube insertion port 93 is formed by a through hole 94 penetrating the transmission case 92 and a wall portion 95 projecting from the peripheral edge of the through hole 94 to the outside of the transmission case 92. One end of the oil filler tube 96 is inserted into the tube insertion port 93.

The oil level gauge 91 is configured to extend from the lower end of the oil filler tube 96 by being inserted into the oil filler tube 96 so that the tip end portion thereof is immersed in the oil stored in the oil pan. When the oil level gauge 91 is inserted into the oil filler tube 96, the tip of the oil level gauge 91 extending from the lower end of the oil filler tube 96 swings and collides with the internal components contained in the transmission case 92. There is a risk. Therefore, a guide plate 97 for guiding the movement of the tip of the oil level gauge 91 is attached to the lower end of the oil filler tube 96. Further, in order to regulate the insertion amount of the oil filler tube 96 into the tube insertion portion 93 by deforming a part of the oil filler tube 96 so as to bulge over the entire circumference at the lower end portion of the oil filler tube 96. Stopper 98 is formed.

Japanese Unexamined Patent Publication No. 2015-161224

However, due to the miniaturization of the transmission case 92 (automatic transmission), the guide plate 97 cannot be provided when an internal object is arranged in the vicinity of the tube insertion port 93 as shown by a virtual line in FIG. ..

Further, a recess 99 is formed on the inner surface of the oil filler tube 96 due to the formation of the stopper 98. Therefore, the tip of the oil level gauge 91 may be caught in the recess 99 on the inner surface of the oil filler tube 96 while the oil level gauge 91 is being inserted into the oil filler tube 96.

An object of the present invention is that even if an internal object is arranged near the tube insertion port, it is possible to guide the movement of the oil level gauge in the case, and the oil level gauge is being inserted into the oil filler tube. It is to provide a guide structure of an oil level gauge which can prevent being caught on the inner surface of an oil filler tube.

In order to achieve the above object, the guide structure of the oil level gauge according to the present invention is a guide structure of the oil level gauge used for checking the amount of oil stored in the case, and the case has a guide structure thereof. A tube insertion port that communicates inside and outside is provided, and one end of the oil filler tube that holds the oil level gauge in the inserted state is inserted into the tube insertion port, and the tip of the oil level gauge is integrated with the case. A guide for guiding the movement of the oil filler tube and a stopper for regulating the amount of the oil filler tube inserted into the tube insertion port are provided.

According to this configuration, a tube insertion port is formed in the case, and one end of the oil filler tube is inserted into the tube insertion port. The oil filler tube holds the oil level gauge in the inserted state.

A guide is provided to guide the movement of the tip of the oil level gauge integrally with the case. Therefore, even if an internal object is arranged near the tube insertion port, the movement of the tip portion of the oil level gauge can be guided by the guide provided integrally with the case.

In addition, a stopper is provided integrally with the case to regulate the amount of the oil filler tube inserted into the tube insertion port. Therefore, it is not necessary to provide a stopper on the oil filler tube, and no recess is formed on the inner surface of the oil filler tube due to the formation of the stopper. Therefore, the oil level gauge is caught on the inner surface of the oil filler tube while being inserted into the oil filler tube. Can be suppressed.

The case is attached with a guide plate integrally having a first extension portion extending along the inner surface of the case and a second extension portion extending from the extension portion by bending into the tube insertion port, and the second extension portion is a tube. The guide may be composed of the surface of the inclined portion, and the stopper may be composed of the peripheral end of the inclined portion, which includes an inclined portion that inclines toward the inside of the case toward the center of the insertion port. ..

In a configuration in which the built-in object is arranged at a position facing a part of the tube insertion port, it is desirable that the first extension portion extends to a position where the built-in object extends beyond the center side of the tube insertion port. This makes it possible to prevent the oil level gauge from colliding with the internal components when the oil level gauge is inserted into the case through the oil filler tube.

Further, the case is integrally formed with a protruding portion having an inclined surface that protrudes into the tube insertion port and is inclined so as to approach the inside of the case toward the center of the tube insertion port, and the guide is composed of the inclined surface. , The stopper may be composed of a boundary portion between the inner surface of the tube insertion port and the inclined surface.

In a configuration in which the built-in object is arranged at a position facing a part of the tube insertion port, it is desirable that the tip of the protruding portion is arranged at a position beyond the center side of the tube insertion port. This makes it possible to prevent the oil level gauge from colliding with the internal components when the oil level gauge is inserted into the case through the oil filler tube.

According to the present invention, even if an internal object is arranged near the tube insertion port, the movement of the oil level gauge in the case can be guided. Further, it is possible to prevent the oil level gauge from being caught on the inner surface of the oil filler tube while being inserted into the oil filler tube.

It is sectional drawing which shows the guide structure of the oil level gauge which concerns on 1st Embodiment of this invention. It is sectional drawing which shows the guide structure of the oil level gauge which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows the guide structure of the oil level gauge which concerns on the modification of 1st Embodiment. It is sectional drawing which shows the guide structure of the conventional oil level gauge.

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

<First Embodiment>
FIG. 1 is a cross-sectional view showing a guide structure 11 according to the first embodiment of the present invention.

The guide structure 11 is a guide structure of an oil level gauge 12 provided in an automatic transmission (AT: Automatic Transmission, CVT: Continuously Variable Transmission, etc.) of a vehicle.

A tube insertion port 14 is provided in a predetermined portion of the transmission case 13 of the automatic transmission. The tube insertion port 14 is formed by a circular opening 15 penetrating the transmission case 13 and a cylindrical wall portion 16 projecting from the peripheral edge of the opening 15 toward the outside of the transmission case 13.

One end (lower end) of the oil filler tube 17 is inserted into the tube insertion port 14. The oil filler tube 17 extends upward from one end inserted into the tube insertion port 14. A seal ring 18 is fitted on the outer peripheral surface of one end of the oil filler tube 17. The oil filler tube 17 is inserted into the tube insertion port 14, and the seal ring 18 comes into liquid-tight contact with the inner surface of the cylindrical wall portion 16 to allow oil to enter between the tube insertion port 14 and the cylindrical wall portion 16. Is prevented from leaking out.

For example, the transmission case 13 has a built-in control lever 19. A part of the control lever 19 is a part of the tube insertion port 14, specifically, a part of the control lever 19 that is biased to one side (right side in FIG. 1) with respect to the center of the tube insertion port 14 and a tube insertion. It is arranged at a position facing the center line direction of the mouth 14 (hereinafter, simply referred to as "center line direction").

Further, a guide plate 21 made of a thin metal plate is provided in the transmission case 13. The guide plate 21 integrally has a first extension 22 and a second extension 23.

The first extension 22 approaches the tube insertion port 14 from a position facing the control lever 19 in the center line direction along the inner surface 24 of the transmission case 13, and extends to the vicinity of the center of the tube insertion port 14. A bolt hole is formed in the base end portion of the first extension portion 22, and the bolt 25 is inserted into the bolt hole and the bolt 25 is screwed into the inner surface 24 of the transmission case 13, so that the first extension portion 22 is formed. 22 is fixed to the transmission case 13. As a result, the guide plate 21 is provided integrally with the transmission case 13.

The second extension 23 is folded back from the tip of the first extension 22 (the end on the center side of the tube insertion port 14) toward the tube insertion port 14, and the inside of the tube insertion port 14 is filled with the tube insertion port 14. It is inclined and extended so as to be located on the upper side (closer to the tip of the cylindrical wall portion 16) as the distance from the center of the tube increases.

The surface (upper surface) 26 of the second extension 23 functions as a guide for guiding the movement of the tip of the oil level gauge 12 when the oil level gauge 12 is inserted into the transmission case 13 through the oil filler tube 17. ..

Further, at the tip 27 of the second extension 23, when the oil filler tube 17 is inserted into the tube insertion port 14, the lower end of the oil filler tube 17 comes into contact with the tip 27, and the oil filler tube 17 is further inserted. Functions as a regulating stopper.

<Effect>
As described above, the guide plate 21 having the first extension portion 22 and the second extension portion 23 integrally is provided integrally with the transmission case 13. The surface 26 of the second extension 23 functions as a guide for guiding the movement of the tip of the oil level gauge 12. Therefore, even if the built-in object is arranged in the vicinity of the tube insertion port 14, the movement of the tip portion of the oil level gauge 12 can be guided.

Further, the tip portion 27 of the second extension portion 23 functions as a stopper that regulates the insertion amount of the oil filler tube 17 into the tube insertion port 14. Therefore, it is not necessary to provide a stopper on the oil filler tube 17, and no recess is formed on the inner surface of the oil filler tube 17 due to the formation of the stopper. Therefore, the oil filler tube 17 is being inserted into the oil filler tube 17 while the oil level gauge 12 is being inserted into the oil filler tube 17. It is possible to prevent it from being caught on the inner surface of the.

The first extension portion 22 extends to a position where the built-in control lever 19 extends beyond the center side of the tube insertion port 14. As a result, when the oil level gauge 12 is inserted into the transmission case 13 through the oil filler tube 17, it is possible to prevent the oil level gauge 12 from colliding with the internal components.

<Second Embodiment>
FIG. 2 is a cross-sectional view showing a guide structure 31 according to a second embodiment of the present invention.

The guide structure 31 is a guide structure of an oil level gauge 32 provided in an automatic transmission of a vehicle.

A tube insertion port 34 is provided in a predetermined portion of the transmission case 33 of the automatic transmission. The tube insertion port 34 is formed as a space inside the cylindrical cylindrical wall portion 35 that protrudes toward the outside of the transmission case 33.

One end (lower end) of the oil filler tube 36 is inserted into the tube insertion port 34. The oil filler tube 36 extends upward from one end inserted into the tube insertion port 34. A seal ring 37 is fitted on the outer peripheral surface of one end of the oil filler tube 36. The oil filler tube 36 is inserted into the tube insertion port 34, and the seal ring 37 is in liquid-tight contact with the inner surface of the cylindrical wall portion 35, so that oil is formed between the tube insertion port 34 and the cylindrical wall portion 35. Is prevented from leaking out.

For example, the transmission case 33 has a built-in control lever 38. A part of the control lever 38 is a part of the tube insertion port 34, specifically, a part of the control lever 38 that is biased to one side (right side in FIG. 2) with respect to the center of the tube insertion port 34 and a tube insertion. It is arranged at a position facing the center line direction of the mouth 34 (hereinafter, simply referred to as "center line direction").

The transmission case 33 is integrally formed with a protruding portion 41 projecting into the tube insertion port 34. The projecting portion 41 is an annular ring surface 43 extending along the inner surface 42 of the transmission case 33 to a position approaching the tube insertion port 34, and the tube insertion port 34 from the inner peripheral edge of the annular surface 43. It has an inclined surface 44 that is inclined so as to be located on the upper side as the distance from the center of the cylinder wall portion 35 (approaching the tip of the cylindrical wall portion 35), and the cross-sectional shape is substantially triangular.

The inclined surface 44 functions as a guide for guiding the movement of the tip portion of the oil level gauge 32 when the oil level gauge 32 is inserted into the transmission case 33 through the oil filler tube 36.

Further, at the boundary between the inclined surface 44 and the inner surface of the tube insertion port 34, that is, the inner surface of the cylindrical wall portion 35, the lower end of the oil filler tube 36 is inserted when the oil filler tube 36 is inserted into the tube insertion port 34. It abuts and functions as a stopper that restricts further insertion of the oil filler tube 36.

<Effect>
Even in such a configuration, the same effects as those shown in FIG. 1 can be obtained. Further, since the number of parts is reduced as compared with the configuration shown in FIG. 1, the material cost and the manufacturing cost of the automatic transmission can be reduced.

<Modification example>
Although one embodiment of the present invention has been described above, the present invention can also be implemented in other embodiments.

For example, in a configuration in which the guide plate 21 is integrally provided on the transmission case 13, the guide plate 21 may have a configuration in which the first extension 51, the second extension 52, and the third extension 53 are integrally provided. good. The first extension 51 extends from a position facing the control lever 19 in the center line direction along the inner surface 24 of the transmission case 13 to the vicinity of the center of the tube insertion port 14. The second extension 52 is bent from the tip of the first extension 51 toward the tube insertion port 14, and extends inside the tube insertion port 14 along the tube insertion port 14 (inner surface of the cylindrical wall portion 16). ing. The third extension 53 is bent from the upper end of the second extension 52 toward the center of the tube insertion port 14, and is located lower in the tube insertion port 14 as it approaches the center of the tube insertion port 14. It slopes and extends like this.

The surface (upper surface) 54 of the third extension 53 functions as a guide for guiding the movement of the tip of the oil level gauge 12 when the oil level gauge 12 is inserted into the transmission case 13 through the oil filler tube 17. ..

Further, the boundary portion 55 between the second extension portion 52 and the third extension portion 53 comes into contact with the lower end of the oil filler tube 17 when the oil filler tube 17 is inserted into the tube insertion port 14, and is further above the boundary portion 55. It functions as a stopper that regulates the insertion of the oil filler tube 17.

Further, in the above-described embodiment, the case where the present invention is applied to an automatic transmission has been taken up, but the present invention can also be applied to an engine.

In addition, various design changes can be made to the above-mentioned configuration within the scope of the matters described in the claims.

11: Guide structure 12: Oil level gauge 13: Transmission case (case)
14: Tube insertion port 17: Oil filler tube 21: Guide plate 22: 1st extension 23: 2nd extension 24: Inner surface (inner surface of case)
26: Surface (guide)
27: Tip (stopper)
31: Guide structure 32: Oil level gauge 33: Transmission case 34: Tube insertion port 36: Oil filler tube 41: Protruding part 42: Inner surface (inner surface of the case)
44: Inclined surface (guide)
51: 1st extension 53: 3rd extension (2nd extension)
54: Surface (guide)
55: Boundary (stopper)

Claims (2)

It is a guide structure of the oil level gauge used to check the amount of oil stored in the case.
The case is provided with a tube insertion port that allows communication between the inside and outside of the case.
One end of an oil filler tube that holds the oil level gauge in the inserted state is inserted into the tube insertion port.
Together with the case, a guide for guiding the movement of the tip of the oil level gauge and a stopper for restricting the insertion amount of the oil filler tube into the tube insertion port are provided.
Only a part of the tube insertion port faces the internal components in the case,
An oil level gauge guide structure in which the guide is provided at a position facing an internal object at the tube insertion port. The case is attached with a guide plate integrally having a first extension portion extending along the inner surface of the case and a second extension portion extending from the first extension portion by bending into the tube insertion port.
The second extension includes an inclined portion that inclines toward the inside of the case toward the center of the tube insertion port.
The guide is composed of the surface of the inclined portion.
The guide structure for an oil level gauge according to claim 1, wherein the stopper is formed by an end portion on the peripheral edge side of the inclined portion.

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