JPH057087Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a drainage hole in a head guard pillar of an industrial vehicle such as a forklift, and particularly relates to a drainage hole that can prevent dust from being sucked in. .

[Prior Art] Some industrial vehicles such as forklifts use a head guard pillar as an air introduction pipe to supply air to an engine through this. There have been various kinds of head guard pillars of this type, and a typical one is shown in FIG.

That is, as shown in FIG. 3, an air inlet 2 is provided in the upper part of the hollow head guard pillar 1, and a louver 3 is attached to this air inlet 2. Further, an air outlet 4 is provided at the lower part of the head guard pillar 1, and an air cleaner 5 of the engine is connected to this air outlet 4.

In such a configuration, air passes through the head guard pillar 1 from the louver 3 and is supplied to the engine (not shown) via the air cleaner 5, but since rainwater etc. may also enter through the louver 3, the head guard Drain hole 6 at the bottom end of pillar 1
is generally provided.

[Problems to be solved by the invention] In the conventional configuration as described above, when the engine is operated, the inside of the head guard pillar 1 around the drain hole 6 becomes negative pressure, and the pressure decreases in proportion to the engine speed. Negative pressure increases. Therefore, there was a problem in that the drain hole 6 became an intake port, and dust etc. were sucked in, causing the engine air cleaner 5 to become clogged at an early stage.

The purpose of this invention is to solve such problems.

[Means for solving the problem] This invention uses an on-off valve to close the drain hole when the negative pressure in the head guard pillar around the drain hole exceeds a predetermined value due to engine operation. It is characterized by having the following.

[Function] With the water drain hole of the head guard pillar of this invention having such a configuration, the water drain hole is not closed when the engine is stopped or rotating at low speed, allowing drainage, and when the engine is rotating at high speed. This closes the drain hole and prevents dust from being sucked in.

[Embodiment] Hereinafter, a preferred embodiment of the drain hole of the head guard pillar according to this invention will be described in detail with reference to the drawings.

Note that the same reference numerals are used for the same or corresponding parts as in the conventional configuration.

1 and 2 show the lower part of a head guard pillar 1 to which this invention is applied.
This head guard pillar 1 is provided with an air outlet 4 at the bottom that guides air to an engine air cleaner (not shown) as in the conventional case, and an air inlet 4 at the top (not shown). The interior of the head guard pillar 1 functions as an air passage that communicates the air inlet and the air outlet 4. Further, a notch is provided at the lower end of the head guard pillar 1, and a drain hole 6 is formed between the lower end of the head guard pillar 1 and the frame 7 in contact with it.

On the outside of this drain hole 6, an on-off valve 10 formed from a single rubber plate is arranged so as to cover it, and both upper corners of this on-off valve 10 are connected to head guard pillars 1 by pins 11. is attached to. The length of the shaft of this pin 11 is slightly longer than the thickness of the head guard pillar 1 and the on-off valve 10, so that a gap is created between the on-off valve 10 and the head guard pillar 1. .

In such a configuration, when the engine is stopped, water that has entered the head guard pillar 1 is drained through the gap between the on-off valve 10 and the head guard pillar 1 because there is a gap.

Furthermore, when the engine is rotating at low speed, for example when idling, the negative pressure generated inside the drain hole 6 is small, about 10 to 20 mmAg.
The on-off valve 10 does not contact the head guard pillar 1,
Drainage is possible. In addition, at low speed rotation,
Since the suction power is small, large amounts of dust are not sucked in, and there is little actual damage.

When the engine speed increases and the negative pressure in the drain hole 6 exceeds a predetermined value, the on-off valve 10 opens the drain hole 6.
is attracted to. As a result, the drain hole 6 is closed and dust and the like are prevented from being sucked in.

In addition, if water enters the head guard pillar 1,
Water intrusion does not need to be considered during normal use, since it is only used in special cases such as car washing or heavy rain.

In the above embodiment, a rubber plate is used for the on-off valve 10, but it goes without saying that the type of the on-off valve is not limited to this.

[Effects of the invention] As described above, according to this invention, the drain hole is closed when the engine is rotating at high speed. Therefore, there is an effect that almost no dust enters through the water drain hole, and the life of the air cleaner element is extended. Further, when the engine is rotating at low speed or stopped, the water drain hole is open, so there is no problem of water accumulating in the head guard pillar.

In addition, we conducted a comparison test with a conventional configuration that does not have an on-off valve in the drain hole, and found that when the engine was rotated at high speed for 2 minutes, the dust that had accumulated inside the air cleaner was smaller than that of the conventional configuration. The weight was 0.8 grams, while the weight of the product based on this invention was 0 grams. As described above, the effects of this invention are tremendous despite its extremely simple configuration.

[Brief explanation of the drawing]

Figure 1 is a view of the lower part of the head guard pillar to which this invention is applied, seen from the front of the drain hole, Figure 2 is a sectional view taken along line A-A in Figure 1, and Figure 3 is the conventional head guard pillar. FIG. 3 is a sectional view of a head guard pillar showing its configuration. In the figure, 1...head guard pillar, 2...air inlet, 3...louver, 4...air outlet, 5...
...Air cleaner, 6...Drain hole, 7...Frame, 10...Opening/closing valve, 11...Pin.

Claims (1)

[Claims for Utility Model Registration] (1) The lower end of a head guard pillar of an industrial vehicle, which has an air inlet at the top and an air outlet at the bottom for sending air to an engine air cleaner, and whose interior functions as an air passage. An opening/closing valve is installed in the drain hole provided in the drain hole so as to close the drain hole when the negative pressure in the head guard pillar around the drain hole exceeds a predetermined value due to operation of the engine. A drainage hole in the head guard pillar is characterized by the provision of a drainage hole. (2) The drain hole of the head guard pillar according to claim 1 of the utility model registration, in which the on-off valve is made of a rubber plate.