JPH0651832U - Oil level gauge - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent water from entering the inside of the case through the passage and improve water penetration resistance. [Structure] A passage 6 is provided inside the packing 5, and a filter 7 composed of fine holes is provided at an opening of the passage 6 on the atmosphere A side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil level gauge for confirming the amount of oil in the case of an engine, a transmission, etc., and more particularly to an oil level gauge having a packing with a passage for communicating the inside of the case with the atmosphere.

[0002]

[Prior art]

 A conventional oil level gauge of this type is shown in FIGS. 5 and 6. That is, the oil level gauge 100 is used for a vehicle engine, a mission, etc., and has a rod-shaped gauge body 103 that is inserted into the case 101 through an insertion hole 102 provided in the case 101. It is composed of a rubber-like elastic packing 104 tightly fitted in an insertion hole 102 provided in the gauge body 103.

A check portion 106 for checking the amount of oil 105 in the case 101 is provided at the end of the gauge body 103 in the insertion direction, and a packing 104 is provided at the end opposite to the check portion 106. Has been.

Incidentally, FIG. 5 shows a type with a handle, and FIG. 6 shows a type without a handle.

In the oil level gauge 100, the gauge body 103 is inserted into the case 101 through the insertion hole 102 of the case 101, and the packing 104 is tightly fitted into the insertion hole 102 so that the case 101 To be attached to.

Further, the oil level gauge 100 has a breather function of allowing the air accumulated in the case 101 to escape to the atmosphere A side while being attached to the case 101. This breather function is achieved by a ventilation groove 107 serving as a passage for communicating the inside of the case 101 provided in the packing 104 with the atmosphere A. The ventilation groove 107 is provided in the fitting portion 104A of the insertion hole 102 of the packing 104. It is provided on the outer circumference.

[0007]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional technique, since the ventilation groove 107 is provided on the outer periphery of the rubber-like elastic packing 104 as a breather function, the oil level gauge 100 is completely attached to the insertion hole 102 of the case 101. When not running, water enters the oil 105 side through the ventilation groove 107 at the time of running in rain or washing the vehicle, and the oil 105 deteriorates.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide an oil level gauge capable of improving water intrusion resistance in which water does not enter the inside of the case through a passage. To provide.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a rod-shaped gauge body inserted into the case through an insertion hole provided in the case and the insertion hole provided in the gauge body are closely packed. In an oil level gauge having a passage that connects the inside of the case and the atmosphere, the passage is provided inside the packing, and a fine hole is formed in the opening on the atmosphere side of the passage. It is characterized by having a luther.

[0010]

[Action]

 In the oil level gauge with the above configuration, a passage that connects the inside of the case and the atmosphere is provided inside the packing, and a filter consisting of fine holes is provided at the opening of the passage on the atmosphere side. Escapes through the passage and through the filter. Moreover, since the filter is made up of fine pores, water does not pass through it and does not enter the tank through the passage.

[0011]

【Example】

 The present invention will be described below based on the illustrated embodiment. 1 and 2 show an oil level gauge according to an embodiment of the present invention. This oil level gauge 1 is used for a car engine, a mission, etc., and is roughly a gauge core metal as a rod-shaped gauge body inserted into the case 2 through an insertion hole 3 provided in the case 2. 4, a packing 5 tightly fitted in the insertion hole 3 provided at one end of the gauge core metal 4, a communication hole 6 as a passage for communicating the case 2 provided inside the packing 5 with the atmosphere A, The filter 7 is composed of fine holes provided at the opening of the communication hole 6 on the atmosphere A side, and the handle 8 is provided on the packing 5 on the atmosphere A side.

The bar-shaped gauge core metal 4 has a circular cross section, and a confirmation portion 10 for confirming the amount of oil 9 in the case 2 is provided at the end portion in the insertion direction. A packing 5 is fixed coaxially with the gauge core metal 4 so as to cover the opposite end of the confirmation portion 10.

The packing 5 is made of a rubber-like elastic body, has a substantially T-shaped cross section, and has a body portion 51 fitted into the insertion hole 3 and the insertion hole 3 when the oil level gauge 1 is inserted into the insertion hole 3. It is composed of a cap portion 52 which is in contact with the end face and serves as a stopper of the oil level gauge 1.

A seal lip 53 having a wedge-shaped cross section is provided on the outer periphery of the body portion 51 of the packing 5 so as to closely contact the inner wall surface of the insertion hole 3 and seal the insertion hole 3. A plurality of seal lips 53 are continuously provided in the insertion direction of the oil level gauge 1.

Further, a concave portion 55 having a step portion 54 whose diameter increases toward the atmosphere A side is formed on the end surface of the cap portion 52 of the packing 5 on the atmosphere A side.

A communication hole 6 is provided inside the packing 5 for communicating the inside of the case 2 with the atmosphere A. The communication hole 6 has a circular cross section and is provided between the gauge cored bar 4 and the seal lip 53 on the left side in the drawing so as to be axially parallel to the gauge cored bar 4 and penetrate the packing 5. The side is opened at the recess 55 of the cap portion 52.

A filter 7 is provided at the opening of the communication hole 6 on the atmosphere A side so as to engage with the step portion 54 of the recess 55 of the cap portion 52 of the packing 5 and close the recess 55. The air chamber 11 is formed by the filter 7 and the recess 55 of the cap portion 52. Further, another filter 12 is overlaid on the entire surface of the filter 7 on the atmosphere A side (hereinafter, the filter 7 is referred to as a second filter and the filter 12 is referred to as a first filter).

The first filter 12 is a polyester-based non-woven fabric, and is impregnated with a fluororesin as a water-repellent treatment so as to easily repel water when water comes in.

The second filter 7 is a PTFE porous sheet having fine pores (having a pore diameter of about 0.5 to 1 μm).

The first and second filters 12 and 7 as described above are engaged with the step portion 54 of the cap portion 52 of the packing 5, and are pressed by the holding portion 81 provided on the handle 8 at the step portion 54. Then, the first and second filters 12 and 7 are attached.

The handle 8 includes a handle portion 82 and a covering portion 83 that covers the cap portion 52 of the packing 5. The handle portion 82 is formed by a rod member so as to have a trapezoidal shape with an inner hollow. The covering portion 83 has a bottomed cylindrical shape, and a plurality of holding portions 81 for holding the first and second filters 12 and 7 by the step portion 54 of the packing 5 are provided on the bottom portion 83A at predetermined intervals in the circumferential direction. Has been. Further, the inner peripheral surface of the peripheral wall 83B of the covering portion 83 contacts the outer peripheral surface of the cap portion 52 of the packing 5, and the end surface of the peripheral wall 83B is flush with the end surface of the cap portion 52 on the case 2 side. ing.

The fixing ring 13 is fixed to the end surface of the peripheral wall 83B of the covering portion 83 of the handle 8. The fixing ring 13 is made of resin (PBT, 66 nylon type [PA66] or the like), and is fixed to the end surface of the peripheral wall 83B by welding or the like so as to come into contact with the end surface of the packing 52 on the case 2 side. There is.

Further, a cover portion slit 83C penetrating in the axial direction is provided on the inner peripheral surface of the peripheral wall 83B of the cover portion 83 of the handle 8. Further, a fixed ring slit 13A penetrating in the radial direction is provided at the interface with the end face of the peripheral wall 83B of the fixed ring 13 so as to communicate with the covering slit 83C.

On the other hand, the chamber 14 is formed because there is the holding portion 81 between the first filter 12 and the bottom portion 83A of the covering portion 83 of the handle 8. Further, since the pressing portion 81 is provided with a predetermined gap in the circumferential direction, the chamber 14, the covering portion slit 83C and the fixed ring slit 13A communicate with each other. That is, the air inside the case 2 escaped through the first and second filters 12 and 7 is escaped to the atmosphere A side through the chamber 14, the covering portion slit 83C, and the fixing ring slit 13A. The covering slit 83C and the fixing ring slit 13A form a so-called ventilation groove.

The oil level gauge 1 has a case in which the gauge core metal 4 is inserted into the case 2 through the insertion hole 3 of the case 2 and the packing 5 is tightly fitted in the insertion hole 3. It is to be attached to 2.

In the oil level gauge configured as described above, the communication hole 6 is provided inside the packing 5, and the first and second filters 12, 7 are provided at the opening of the communication hole 6 on the atmosphere A side. Since it is provided, the air accumulated in the case 2 while being mounted in the case 2 is introduced into the air chamber 11 through the communication hole 6. Then, the entire second filter 7 is provided with air permeability in the air chamber 11, and the air introduced into the air chamber 11 flows to the chamber 14 through the second filter 7 and the first filter 12, and the chamber 14 Is released to the atmosphere A side through the covering slit 83C and the fixed ring slit 13A. In this way, it has a breather function of letting the air inside the case 2 escape to the atmosphere A side.

Even if water comes into the chamber 14 from the outside through the fixed ring slit 13A and the covering portion slit 83C, the first filter 12 is water-repellent, so that the first filter 12 repels water. In addition, since the second filter 7 is composed of fine pores, the second filter 7 allows air to pass through but does not allow water to pass through, so that water does not enter the case 2 through the communication hole 6.

Further, since the pressure inside the case 2 has the breather function as described above, it is opened to the outside (atmosphere A side), and water does not enter the inside of the case 2.

From the above, the water penetration resistance can be improved.

Furthermore, unlike the prior art, since the passage that communicates the inside of the case 2 with the atmosphere A side is not provided in the outer peripheral portion of the packing 5, the sealing property of the packing 5 is improved.

By making the handle 8 a colored resin, the feeling of contact and the visibility of the oil level gauge are improved.

In this embodiment, the water repellent first filter 12 is superposed on the second filter 7 having fine pores. However, even if only the second filter 7 is used, the air accumulated inside the case 2 is accumulated. It has a membrane function that allows water to pass through, but does not allow water to pass through, and can sufficiently improve the water penetration resistance. Specifically, the pressure resistance of the second filter 7 of this embodiment is about 0.6 kgf / cm ² in a single burst test. It has been confirmed by experiments that air permeates when a pressure of about 0.008 kgf / cm ² is applied. On the other hand, no water leakage occurred even when added to water at 0.5 kgf / cm ² × 2 hours.

Here, the reason why the first filter 12 is overlaid on the second filter 7 will be specifically described.

First, the first filter 12 is a mere polyester non-woven fabric as described above, and has a thickness t: about 0.5 mm. Water does not leak to the first filter 12 if it is at atmospheric pressure, but if 0.05 kgf / cm ² is applied, the water permeates and leaks (the handle 8 in which the first filter 12 is stored (+ Α pressure is applied to the covering portion 83 depending on the splash of water and the speed of the vehicle.)

In the second filter 7, as shown in FIG. 3, when water adheres to the portion B which is the surface of the second filter 7 on the atmosphere A side, the breather effect (air escape direction: arrow D direction) Since it has been confirmed by experiments that the water will disappear, the first filter 12 is impregnated with a fluororesin aiming at a water-repellent effect to repel water, and the C surface, which is the atmosphere A side surface of the first filter 12, is repelled. It is necessary to prevent more water from penetrating (note that the test is conducted with a waterproof spray). The point is that water is repelled on the surface of the first filter 12 and a part of the surface where air passes is secured.

The second filter 7 is a PTFE membrane and has a membrane function of allowing air to pass therethrough and not allowing water to pass therethrough. As shown in FIG. 4, the second filter 7 has micro holes 71 having a thickness t: 0.5 mm and a diameter d of about 0.5 to 1 μm. If the diameter d of the hole 71 is damaged and becomes large, water leakage will occur from there. Therefore, the management of the second filter 7 is a key point for maintaining the function.

From the above, in order to protect the second filter 7, the first filter 12 is overlapped to prevent scratches due to dust or the like. Furthermore, the first filter 12 is considered to prevent the formation of a water film on the second filter 7.

In the above-described embodiment, the type with the handle 8 is used for description, but the same applies to the type without the handle.

[0039]

[Effect of device]

 The present invention has the above-mentioned configuration and operation, and a passage for communicating the inside of the case with the atmosphere is provided inside the packing, and the filter provided at the opening on the atmosphere side of the passage is composed of fine holes. Therefore, the air that has accumulated in the case is released, water does not pass through, and does not enter the case through the passage. Therefore, it has a breather function and can improve the resistance to water penetration into the case.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a state in which an oil level gauge according to an embodiment of the present invention is attached to a case.

2 is a diagram showing the oil level gauge of FIG. 1, FIG. 2 (a) is a longitudinal sectional view of an essential part, and FIG. 2 (b) is a top view of the essential part of FIG. 2 (a). Yes, the same figure (c) is the same figure (a)
FIG. 4 is a sectional view of the main part of FIG.
FIG.

FIG. 3 is a plan view showing first and second filters of an oil level gauge according to an embodiment of the present invention.

4 is an enlarged vertical sectional view of an essential part of the second filter of FIG.

5 (a) is a vertical cross-sectional view showing a state in which a conventional oil level gauge with a handle is attached to a case, and FIG. 5 (b) is an oil level gauge of FIG. 5 (a). Is a partially cutaway front view, and FIG. 7C is a left side view of the packing portion in FIG.

6 (a) is a vertical cross-sectional view showing a state in which a conventional oil level gauge without a handle is attached to a case, and FIG. 6 (b) is an oil level gauge of FIG. 6 (a). It is a partially broken front view of FIG.

[Explanation of symbols]

 1 Oil Level Gauge 2 Case 3 Insertion Hole 4 Gauge Core Bar (Gauge Body) 5 Packing 51 Body 52 Cap Cap 53 Seal Lip 54 Step 55 Recess 6 Communication Hole (Passage) 7 Filter (Second Filter) 71 Hole 8 Handle 81 Holding part 82 Handle part 83 Cover part 83A Bottom part 83B Peripheral wall 83C Cover part slit 9 Oil 10 Confirmation part 11 Air chamber 12 Filter (first filter) 13 Fixing ring 13A Fixing ring slit 14 chamber

Claims (1)

[Scope of utility model registration request] 1. A bar-shaped gauge main body inserted into the case through an insertion hole provided in the case, and a packing tightly fitted in the insertion hole provided in the gauge main body. An oil level gauge having a passage for communicating the inside of the case with the atmosphere, wherein the passage is provided inside the packing, and a filter having fine holes is provided at an opening of the passage on the atmosphere side. gauge.