JPS6310332Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cab-over type vehicle window glass that improves the front visibility of the vehicle.

Conventionally, drivers of cab-over vehicles, where the driver's eyes are located at a high position, have to avoid the lower edge of the window glass when a pedestrian, especially a child, approaches the front of the vehicle when starting or slowing down in an urban area. Since the driver may be completely hidden by the lower part of the vehicle body, the vehicle is started or driven slowly while checking the front of the vehicle and its vicinity using a mirror, etc. Moreover, the driver must constantly check the surroundings of the vehicle while driving, which is extremely tiring both physically and mentally.

Therefore, as a countermeasure, in order to eliminate the need to check the area in front of the vehicle and its vicinity using a mirror, etc., the lower edge of the window glass of the vehicle can be extended downward to provide a direct view of the area in front of the vehicle and its vicinity (without using a mirror, etc.). Vehicles with improved visibility (range in which obstacles can be seen directly) have appeared. However, although the improved vehicle has the above effects when driving in the city, the driver
If you are driving at high speeds in the suburbs or on expressways while looking far in the direction of the vehicle, you will not feel any fear, but if you look close to the vehicle while driving at high speeds, you may notice the road surface, nearby scenery, and structures. The disadvantage was that the flow of events was so fast that it was frightening and easily fatigued both physically and mentally.

The present invention was developed with the aim of solving these conventional drawbacks, and the lower edge of the vehicle window glass is designed to allow the driver to directly check the road surface and obstacles near the front of the vehicle. In a cab-over type vehicle that extends downward, the downwardly extending portion of the window glass and in the vehicle width direction so that the road surface flow state that is visually recognized from the eye point of the driver's seat is viewed in approximately the same state. A curve is formed connecting the front part and the other parts so that the front part on the driver's seat side is lower than the other parts, and the visible light transmittance of the lower part of the curve is calculated from the visible light transmittance of the upper part of the curve. It is characterized in that it is made smaller than the light transmittance so that the driver does not feel the flow of the road surface near the vehicle part when driving at high speed.

In order to improve direct visibility in front of and in the vicinity of the vehicle, the present invention reduces the visible light transmittance of the downwardly extending lower edge of the vehicle window glass compared to other parts, making it suitable for use in urban areas. When driving slowly, the vehicle is slow even if the visible light transmittance of the lower part of the window glass is smaller than the other parts, so the driver must be careful to avoid obstacles in front of the vehicle and in the vicinity. You can check it. On the other hand, at high speeds, the speed of the vehicle is fast, so there is less time to check the road surface at the same point in front of the vehicle and in the vicinity.
Because the visible light transmittance of the lower part of the window glass is low, it is difficult for the driver to clearly see the road surface and therefore feel the flow of the road surface, which has the effect of reducing driver fatigue and ensuring safe driving. It's playing.

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

In Figure 1, a cab-over type vehicle is shown in which the lower edge of the window glass extends downward, and the visible light transmittance of the downwardly extending portion (shaded area) of the window glass is smaller than that of the upper portion. ing.

Figure 2 shows the relationship S between the driver's visual point and the angular velocity of the eyes with respect to the vehicle speed V when the vehicle is running, where e is the driver's eye point and A is from the bottom of the window glass to the front of the vehicle. B is a point on the road surface where you can directly see people, obstacles, etc., B is a point on the road surface where you do not feel fear and fatigue due to the flow of the road surface, A' and B' are eye point e and points A and B on the road surface. The height at the point where each straight line connecting the lines intersects the window glass,
A ₁ ″ is the point where the driver moves from eye point e to point A on the road surface.
The angular velocity of the eyes (ωrad/sec), which represents the magnitude of the flow on the road surface that the driver feels when visually observing the point _B , is the angular velocity of the eyes (ωrad/sec) that represents the magnitude of the flow on the road surface that the driver feels when the driver visually observes point B on the road surface from eye point e. This is the angular velocity of the eye (2 rad/sec), which represents the magnitude of the perceived flow on the road surface.

As can be seen from this angular velocity characteristic curve, as the viewing point approaches point A from point B, which is far away in the direction of vehicle travel, the angular velocity of the eyes increases, and the flow of the road surface is fast, making the driver feel frightened and easily fatigued. Experiments have shown that from an ergonomic point of view, an angular velocity of 2 rad/sec or less is the angular velocity of the eye at which people do not feel fear and fatigue due to the flow of the road surface.

For this reason, the vehicle window glass according to the present invention has a height that matches the angular velocity that does not cause fear fatigue when driving.
The visible light transmittance of the part above height B' is set as the regulatory safety standard value, and the visible light transmittance of the part below height B' is set to be small.

Figure 4 shows an example of the window glass according to the present invention.
A height that prevents you from feeling fear and fatigue due to the flow of the road surface when driving.
This is an example in which the visible light transmittance of the part below B' is gradually lowered, and the part B' has a waveform in which the part in front of the driver is lower than the other part in the vehicle width direction.

In addition, the waveform of B' is shown in Figures 6 and 7.
This will be explained based on the diagram.

Assume that a point P (x, y, z) on the road surface is visually recognized from eye point e as shown in FIG. here,
The x-axis is the axis in front of the vehicle that passes through eyepoint e, the y-axis is the horizontal axis that passes through eyepoint e, the z-axis is the vertical axis that passes through eyepoint e, and the O point is the intersection of the z-axis and the road surface. Point Q is the point where y = 0 when a line is extended from point P parallel to the y axis, point R is the point where z = 0 when a line is extended from point P parallel to the z axis, and θ is R
The angle formed by the line connecting points and points e and the x-axis, φ, is ∠
This is the corner of ReP. Then, if the distance between point R and point e is γ, and the distance between point P and point e is ρ, then γ=(x ²
+y ² ) ^1/2 , ρ=(x ² +y ² +z ² ) ^1/2 .

From eye point e to point P (x, y, z) on the road surface
The angular velocity ω (rad/sec) of the eye when visually recognizing is expressed by the following formula.

In addition, dθ/dt=1/γ ² (-ydx/dt+xdy/dt) rad/s
ec...(2) dφ/dt=1/γ(-zx/ρ ² dx/dt-zy/ρ ² dy
/dt +γ ² /ρ ² dz/dt) rad/sec...(3) Now, assuming that the vehicle is moving forward at a constant speed (V), dy/dt=dz/dt=0, Since dx/dt=V, equation (1) is becomes.

Then, the angular velocity ω(rad/
sec) is calculated and the constant angular velocity curves connected on the road surface are shown in Fig. 7. Note that W in FIG. 7 is a line drawn from the eye point e to the point where the line connecting the lowest part A' of the window glass and the front pillar intersects the road surface. Therefore, for example, the constant angular velocity curve in FIG.
The curve connecting the point where the line connecting the 2 rad/sec curve and eye point e intersects the window glass is shown in Figure 4.
This becomes B'.

In this case, the visible light transmittance of the lower part of the window glass is the part of the angular velocity characteristic curve shown in Figure 2.
Corresponding to the change of A ₁ ″−B ₁ ″, as shown in Figure 3
Transmission range at A ₂ ″ (corresponding to window glass height A′)
You can arbitrarily select from any characteristic curve within the transmittance range (b) - (c) and B ₂ '' (corresponding to the height B' of the window glass) (a) - (d). As for the transmittance characteristics, it is desirable that the transmittance decreases as the height of the window glass decreases, as shown in curve a, and b
Exclude items with inverse characteristics such as curves.

Fig. 5 shows another embodiment of the window glass according to the present invention, in which the visible light transmittance of the portion below the height B' is made constant instead of gradually as in the above embodiment. This is an example of a waveform in which the part in front of the driver is lower than the rest in the vehicle width direction for the same reason as in the embodiment.

When the vehicle window glass of the present invention is adopted, the visible light transmittance of the lower part of the window glass, where the angular velocity of the eye is faster, is gradually or evenly lowered compared to other parts, making it easier to drive. When driving slowly, drivers can fully see people and obstacles in front of and in the vicinity of the vehicle, but when driving at high speeds, it becomes difficult to see fast-flowing parts of the road surface, so they do not experience fear and fatigue. This has the effect of contributing to safe driving.

[Brief explanation of drawings]

Figure 1 is a front view of a cab-over type vehicle, Figure 2 is a side view of the vehicle showing the relationship between the viewing point and the angular velocity of the eye, Figure 3 is a chart showing the characteristic curve of transmittance, and Figure 4 is the invention developed by the present invention. A front view of one embodiment, FIG. 5 is a front view of another embodiment, and FIG. 6 is a front view of the vehicle eye point e.
FIG. 7 is an explanatory diagram showing the coordinate system when the front road surface P is visually recognized from the vehicle, and FIG. 7 is a distribution diagram showing the uniform angular velocity distribution state of the front road surface at a certain vehicle speed. B'...The height of the window glass that prevents you from feeling fear and fatigue due to the flow of the road while driving, A'...The lowest part of the window glass.

Claims (1)

[Scope of utility model registration request] In a cab-over type vehicle in which the lower edge of the vehicle window glass is extended downward so that the driver can directly check the road surface and obstacles near the front of the vehicle, the flow of the road surface as seen from the eye point of the driver's seat. The front part and the other part of the window glass are arranged so that the downwardly extending part of the window glass and the front part on the driver's seat side is lower than the other part in the vehicle width direction so that the front part of the window glass is visually recognized in substantially the same state. The visible light transmittance of the lower part of the curve is made smaller than the visible light transmittance of the upper part of the curve, so that when the driver is driving at high speed, the road surface near the front of the vehicle A vehicle window glass characterized in that the flow of water is not felt.