JPH068246Y2 - Seal structure for the oil level gauge mounting part of industrial vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a seal structure for an oil level gauge mounting portion of an industrial vehicle represented by a forklift.

2. Description of the Related Art In industrial vehicles such as forklifts, side frames on both sides of the vehicle body are formed in a box cross-sectional shape, and one of them is effectively used as an oil tank. An oil level gauge is attached to this oil tank as shown in FIGS. 4 to 7 so that the oil storage amount can be easily checked. In the figure, reference numeral 1 is an oil tank constituted by a side frame of a vehicle body, and a cylindrical air vent 2 having a bottom is provided upright on an upper wall 1a thereof. The bottom of this air vent 2 projects into the oil tank 1, a gauge insertion hole 4 is formed at the center position of the bottom wall 3, and a vent pipe 5 is horizontally projected on the peripheral wall near the bottom wall 3. . 6 is a gauge bar main body that is detachably attached to the air vent 2,
A cap 7 having an air breather (not shown) is attached to the upper end of the vent pipe 5 and the air vent as shown by arrows in FIG. 4 as the oil level in the tank rises and falls due to the operation of hydraulic equipment. 2. The air flow can be secured through the cap 7. Also,
A seal rubber 8 having an annular lip 9 that is in close contact with the upper peripheral portion of the gauge insertion hole 4 is attached to an intermediate portion of the gauge bar body 6, and the oil tank is used during sudden braking, sudden acceleration or turning of the vehicle. Even if the oil inside 1 swings, the gauge insertion hole 4 is sealed to prevent the oil from being blown out from the cap 7. This similar structure is
For example, it is disclosed in Japanese Utility Model Publication No. 57-60834.

The neck 2a for engaging the cap 7 is joined to the upper end portion of the air vent 2, but the neck 2a is attached with poor accuracy, and the neck 2a is joined or collapsed. 2a
When the center of the gauge insertion hole 4 is deviated from the opening of the gauge or the cap 7 is obliquely attached to the neck 2a, the gauge bar main body 6 tilts obliquely as shown in FIG. There is a problem in that the gauge is removed from the upper peripheral edge portion of the gauge insertion hole 4 and a sealing failure occurs. Therefore, in the present invention, even when the gauge bar main body is inserted at an angle, the annular lip of the seal rubber can be properly brought into close contact with the upper peripheral portion of the gauge insertion hole to ensure a reliable seal. The present invention provides a seal structure for an oil level gauge mounting portion of an industrial vehicle capable of performing the above.

Means for Solving the Problem A lower center portion of a seal rubber having an annular lip attached to an intermediate portion of a gauge bar main body and closely contacting an upper peripheral edge portion of a gauge insertion hole of an air vent bottom wall is formed from the gauge insertion hole. Is also formed to have a slightly smaller diameter, has a shoulder portion close to the back surface near the tip of the annular lip, and is formed to have a smaller diameter from the shoulder portion to the lower side so as to project downward from the annular lip. The insertion guide part is formed to project.

Action The shoulder portion regulates the sagging deformation of the annular lip and maintains the close contact with the upper peripheral edge of the gauge insertion hole. When the gauge bar body is obliquely inserted, the peripheral side surface of the insertion guide portion on the tip side of the small diameter is slidably in contact with the gauge insertion hole, and the insertion guide portion aligns the seal rubber with the gauge insertion hole.

Embodiment Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings by attaching the same reference numerals to the same portions as those of the conventional configuration.

1 to 3, a bottom portion of the upper wall 1a of the oil tank 1 projects into the oil tank 1, and a gauge insertion hole 4 is formed at a central position of the bottom wall 3 and a peripheral wall near the bottom wall 3 is formed. The air vent 2 is provided at a point where a cylindrical air vent 2 is provided uprightly with a vent pipe 5 protruding in the horizontal direction, and at the upper end of a gauge bar main body 6 which is inserted through the air vent 2.
A cap 7 having an air breather function that engages and disengages with the neck 2a is attached, and a seal rubber 8 having an annular lip 9 that is in close contact with the upper peripheral edge of the gauge insertion hole 3 is attached to the middle portion of the gauge bar body 6. The basic structure such as the points described above is the same as the conventional one. Here, an insertion guide portion 10 projecting downward from the annular lip 9 is provided at the lower central portion of the seal rubber 8. The insertion guide portion 10 has a diameter slightly smaller than that of the gauge insertion hole 4,
It has a shoulder portion 11 near the back surface near the tip of the annular lip 9, and is formed to have a smaller diameter from the shoulder portion 11 toward the lower side. Although the insertion guide portion 10 is formed in a substantially hemispherical shape in the present embodiment, it may be tapered.

According to the above-described structure of the embodiment, since the shoulder portion 11 of the insertion guide portion 10 is close to the back side near the tip of the annular lip 9, unnatural drooping deformation (waviness deformation) of the annular lip 9 is restricted. Therefore, it is possible to always maintain a close posture with the upper peripheral edge of the gauge insertion hole 4. Therefore, when the gauge bar main body 6 is properly inserted into the gauge insertion hole 4, it is possible to prevent the annular lip 9 from partially entering the gauge insertion hole 4 and causing a sealing failure. Further, the accuracy of attaching the neck 2a of the air vent 2 is poor, or the center of the opening of the neck 2a and the gauge insertion hole 4 are deviated, or the cap 7 is obliquely attached to the neck 2a, and the gauge bar main body 6 is attached to the gauge insertion hole. In the case where the seal rubber 8 is inserted obliquely, the peripheral side surface of the tip end side of the insertion guide portion 10 of the seal rubber 8 comes into sliding contact with the edge of the gauge insertion hole 4 in advance, and the sliding contact gradually moves to the shoulder portion 11 side. By
Centering of the seal rubber 8 with respect to the gauge insertion hole 4, that is, alignment of the gauge body 6 is performed. As a result, when the insertion guide portion 10 passes through the gauge insertion hole 4, the annular lip 9 may be regulated to hang down by the shoulder portion 11, and accordingly, the annular lip 9 may be properly and closely attached to the upper peripheral edge portion of the gauge insertion hole 4. The seal around the gauge insertion hole 4 can be reliably performed.

As described above, according to the present invention, it is possible to prevent the annular lip from sagging and deforming due to the shoulder portion, and it is possible to maintain the posture in which the annular lip can always be in close contact with the upper peripheral portion of the gauge insertion hole. It is possible to prevent the annular lip from partially entering the gauge insertion hole and causing a seal failure. Even when the main body of the gauge bar is inserted diagonally into the gauge insertion hole, the front of the small diameter tip of the insertion guide comes into sliding contact with the edge of the gauge insertion hole, and the centering action of the seal rubber, and therefore the gauge bar. The centering action of the main body is performed, and there is a great practical effect that the annular lip can be properly brought into close contact with the upper peripheral edge of the gauge insertion hole to perform reliable sealing.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing an inserting process of a gauge bar main body, FIG. 3 is a sectional view of a seal rubber, and FIGS. 4 and 5 show a conventional structure. Cross section,
FIG. 6 is a sectional view of the gauge bar main body separated, and FIG. 7 is a sectional view of the seal rubber. 1 ... Oil tank, 1a ... Top wall, 2 ... Air vent, 3 ... Bottom wall, 4 ... Gauge insertion hole, 6 ... Gauge bar body, 7 ... Cap, 8 ... Seal rubber, 9 ...
Annular lip, 10 ... Insertion guide part, 11 ... Shoulder part.

Claims (1)

[Scope of utility model registration request] 1. A gauge insertion hole formed in a bottom wall of an air vent at an intermediate portion of a gauge bar main body having a cap at an upper end and detachably attached to a cylindrical air vent standing on an upper wall of an oil tank. In a structure in which a seal rubber having an annular lip in close contact with the upper peripheral edge is attached, the diameter of the seal rubber is formed slightly smaller than the gauge insertion hole in the lower center portion of the seal rubber and is close to the back surface near the tip of the annular lip. An oil level gauge for an industrial vehicle, which has a shoulder portion, and has an insertion guide portion formed to have a small diameter from the shoulder portion to a lower side and projecting downward from the annular lip. Sealing structure for mounting part.