Patent Description:
The disclosure can be applied in heavy-duty vehicles, such as trucks, buses, and construction equipment, or even in passenger cars or other vehicle. Although the disclosure will be described with respect to a particular vehicle, the disclosure is not restricted to any particular vehicle.

The cab of known vehicles such as trucks, coaches or buses usually includes a wiper panel assembly. The wiper panel assembly is located at the front of the vehicle, between the windscreen and the front panels having the front grilles for cooling the engine. The wiper panel assembly is adjacent to a bottom edge of the windscreen. The windshield wipers are often implanted in front of the wiper panel assembly or at the back thereof. The wiper panel assembly usually has two corner parts, one at each lateral ends thereof, positioned adjacent to two corresponding bottom corners of the windscreen.

A disadvantage of known wiper panel assemblies is that, when the vehicle reaches cruise speed, rainwater may strip from the corners of the wiper panel assembly and end up on the side windows, causing reduction of the driver's visibility by the water flowing along the side window and, over time, by accumulation of dirt carried by the rainwater.

<CIT> discloses the features of the preamble of claim <NUM> with a draining device in a vehicular front part. preventing water entering a cowl from adhering to a door hinge, without using a shielding plate.

The disclosure proposes to improve a driver's visibility and/or to reduce the flowing of water along an area of a ground vehicle to be avoided, such as a side window of the ground vehicle.

An aspect of the disclosure concerns a corner part for a wiper panel assembly for a ground vehicle as defined by claim <NUM>.

Hereby, a technical effect includes that, when in use, in particular at cruise speed such as <NUM>-90kph (kilometers per hour), drained liquids including rainwater and/or windshield washer may be received at the inlet of the drain, carried to the outlet via the channel and strip outside of the drain from the outlet. An advantage is that the drain may be configured to direct the flow of drained liquids along a desired path and/or to strip according to a desired trajectory. In particular, this may reduce the risk of drained liquids reaching an area of the ground vehicle to be avoided, such as a side window of the ground vehicle. In use, at a top edge of the outside panel, the inside face may be facing or be adjacent to a bottom corner of a windscreen of the ground vehicle, while the outside face may be oriented towards the outside of the ground vehicle. The corner part may constitute a part of an outer shell of the cab of the ground vehicle.

The outlet is located in a frontward direction relative to the inlet. The frontward direction is perpendicular to the upward direction and substantially parallel to the outside panel. In other words, the outlet is located forward relative to the inlet, considering the forward direction of travel of the ground vehicle. Hereby, a technical effect is that the relative position of the inlet and the outlet promotes that the strip of drained liquids outgoing from the outlet is directed substantially opposite to the upward direction (i.e. downward) even at cruise speed, thus reducing the risk that the area of the ground vehicle to be avoided is reached by the strip of drained liquids, in particular if the inlet is also positioned in the upward direction relative to the outlet. In this configuration, gravity promotes flowing of the drained liquids from the inlet to the outlet as slow speeds. At higher speeds, such as cruise speed, the relative position of the inlet and the outlet may achieve that a lower pressure is obtained at the outlet compared to the inlet. This promotes that the drained liquids flow from the inlet to the outlet, since the drained liquids tend to flow from higher to lower pressure areas. The low pressure at the outlet is preferably obtained by the placement and/or the shape of the outlet. Preferably, the outlet is placed where the airflow flowing along the outside face has the highest velocity, when the vehicle is at cruise speed, so that the lowest pressure is obtained, according to Bernoulli's principle.

In certain examples, the inlet is located in the upward direction relative to the outlet. In other words, the inlet is located above the outlet, considering the orientation of the ground vehicle when the ground vehicle stands or travels on a road. Hereby, a technical effect is that the inlet may be positioned higher for better catching of drained liquids, in particular coming from a windscreen of a vehicle, while the outlet may be positioned lower for releasing the drained liquids under the area of the ground vehicle to be avoided, such as the side window.

In certain examples, in a rearward direction perpendicular to the upward direction, the outside face and the inside face are delineated by a rear edge of the outside panel, and the corner part further comprises a lateral wing, protruding from the outside face at the rear edge, being perpendicular to the outside panel and substantially parallel to the rearward direction. In certain examples, the lateral wing is positioned along the top edge of the outside panel. In use, the lateral wing may be horizontal, or slightly inclined relative to a horizontal plane. More than one lateral wing may be provided. Hereby, a technical effect is that the lateral wing may guide a strip of drained liquids away from an area of the ground vehicle to be avoided, such as a lateral window, in particular in case the drain is clogged or saturated, or when some of the drained liquids do not enter into the drain. Preferably, the lateral wing is located in the rearward direction relative to the inlet of the drain. In certain examples, the inlet is closer to the rear edge than the outlet, i.e. the outlet is in the frontward direction relative to the inlet. In certain embodiments, two lateral wings may be provided, including an upper lateral wing for guiding the drained liquids that do not enter into the drain, and a lower lateral wing that may stabilize the flow and ensure that the flow is horizontal after the wiper panel, or at least not going upwards. Thus, drained liquids that follow the wiper panel may advantageously flow below the side window and not upon it.

In certain examples, at least one of the inlet and outlet is funnel-shaped. Hereby, a technical effect is that the inlet may be shaped as a funnel or a hopper for better catching of drained liquids and the outlet may be shaped as a funnel or a jet for better directing and shaping drained liquids flow outgoing from the drain. Another technical effect is that, when drained liquids flow from the channel to the outlet, the funnel-shaped outlet may cause a pressure decrease in the drained liquids flow at the outlet and promotes that the flowing of drained liquids is not reversed, in particular at cruise speed. In an embodiment, the funnel-shaped inlet is oriented in the upward direction. In an embodiment, the funnel-shaped outlet is oriented substantially in the rearward direction. The inlet may be funnel-shaped while the outlet is not, the outlet may be funnel-shaped while the inlet is not, or both the inlet and the outlet may be funnel-shaped. In other examples, an airfoil is formed at the outlet.

In certain examples, in the upward direction, the outside face and the inside face are delineated by a top edge of the outside panel and wherein the corner part further comprises a front wall, protruding from the top edge substantially in the upward direction, positioned close to the inlet and being oriented transversally relative to the top edge. In an embodiment, the inlet is positioned at a distance from the front wall and in the frontward direction relative to the front wall, while the front wall is positioned in the upward direction relative to the inlet. The front wall may protrude from the top edge at the lateral wing. Hereby a technical effect is that, when the ground vehicle is at cruise speed, a slight air pressure buildup may form at the front wall, i.e. over and/or at the rear relative to the inlet, as the front wall interrupts the airflow. Comparatively to the outlet, a higher air pressure may be obtained at the inlet. Thus, entrapment or suction of drained liquids into the inlet of the drain is promoted in particular at cruise speed.

In certain examples, the drain is formed integrally with the outside panel. Hereby, a technical effect is to reduce the manufacturing steps for obtaining the corner part.

In certain examples, the corner part comprises an inside part, assembled with the outside panel at the inside face thereof, the inside part forming at least one portion of the channel and of the inlet of the drain. Hereby, a technical effect is to reduce some of the manufacturing constraints for obtaining more complex or tortuous shape for the drain.

Another aspect of the disclosure concerns a vehicle cab comprising a wiper panel assembly comprising the corner part as defined above, the vehicle cab further comprising a windscreen.

In certain examples, the corner part is adjacent to a bottom corner of the windscreen and the inlet of the corner part is located at the bottom corner of the windscreen. Herein, a technical effect is that the inlet is positioned for retrieve a high amount of drained liquids that may flow along the windscreen.

Another aspect of the disclosure concerns a ground vehicle comprising the vehicle cab as defined above.

In certain examples, the ground vehicle is a truck, a coach, a bus or a van.

<FIG> partially shows a vehicle cab <NUM> belonging to a ground vehicle <NUM>. Here the ground vehicle <NUM> is a truck, but the ground vehicle <NUM> could be a coach, a bus or a van.

A frontward direction X1, a lateral direction Y1 and an upward direction Z1 are defined, fixed relative to the cab <NUM> and perpendicular to one another. In use of the vehicle <NUM>, when the vehicle <NUM> travels straight forward, the direction X1 is directed substantially in the direction of travel. In use of the vehicle <NUM>, the direction Z1 is directed upwards and substantially vertical and the direction Y1 is directed transversally. A rearward direction X' <NUM> is also defined, opposite to the frontward direction X1.

At a front end of the vehicle cab <NUM>, the vehicle cab <NUM> comprises, successively in the direction Z1, a front panel assembly <NUM>, a wiper panel assembly <NUM>, a windscreen <NUM>, a sun visor <NUM> and a roof panel assembly <NUM>. These parts are oriented substantially perpendicular to the frontward direction X1.

The front panel assembly may have front grilles provided therethrough.

Laterally, the windscreen <NUM> is delimited by a left lateral pillar <NUM> and a right lateral pillar of the cab <NUM>, not visible in <FIG>. The lateral pillars are oriented substantially parallel to direction Z1 and connecting the wiper panel assembly <NUM> to the roof panel assembly <NUM>.

The wiper panel assembly <NUM> comprises, successively along direction Y1, a right corner part, a central part <NUM> and a left corner part <NUM>. Although the right corner part is not visible in <FIG>, it has the same features compared to the left corner part <NUM>, arranged symmetrically relative to a symmetry plane perpendicular to direction Y1. The central part <NUM> and the corner parts are adjacent to a bottom edge <NUM> of the windscreen <NUM>, and to a top edge <NUM> of the front panel assembly <NUM>. The central part <NUM> may carry windshield wipers, not shown in <FIG>. The central and corner parts may consist of a single part or, as shown in <FIG>, of assembled parts.

The central part <NUM> may be oriented substantially parallel to the direction X1. Each corner part has an outside panel <NUM>, with an outside face <NUM>, visible from the outside of the vehicle cab <NUM>, and an inside face <NUM>, turned towards the inside of the cab <NUM>, not visible in <FIG> but visible for other illustrated examples in <FIG> and <FIG>. For the left corner part <NUM>, the outside face <NUM> is oriented in a direction perpendicular to the direction Z1, directed obliquely along the frontward direction X1 and/or along the lateral direction Y1. The inside face <NUM> is oriented opposite.

The outside panel <NUM> may be curved around an axis substantially parallel to direction Z1, for connecting the central part <NUM>, perpendicular to the direction X1, to the lateral side of the cab <NUM>, perpendicular to the direction Y1. Thus, the faces <NUM> and <NUM> are curved in the same manner. The curved faces <NUM> and <NUM> of the outside panel <NUM> are substantially parallel to direction Z1 and are delineated by a top edge <NUM> in direction Z1, a rear edge <NUM> in direction X'<NUM> and a bottom edge <NUM> in a direction opposite to direction Z1, the edges <NUM>, <NUM> and <NUM> belonging to the outside panel <NUM>. The top edge <NUM> and the bottom edge <NUM> are opposite to one another, and substantially perpendicular to the upward direction Z1. The rear edge <NUM> connects the edges <NUM> and <NUM> and is substantially parallel to the upward direction Z1. At the rear edge <NUM>, the faces <NUM> and <NUM> are substantially perpendicular to direction Y1.

The top edge <NUM> is in particular adjacent to a lateral end of the bottom edge <NUM> of the windscreen <NUM>, forming a bottom corner of the windscreen <NUM>. In particular, the top edge <NUM> of the corner part <NUM> is adjacent to a right bottom corner <NUM> of the windscreen <NUM>. The top edge <NUM> is preferably positioned in the direction X1 relative to the windscreen <NUM> so that a gap is defined between the top edge <NUM> and the windscreen <NUM>, used as a gutter for drained liquids, in particular including rainwater and/or windshield washer fluid.

Along direction Z1, each corner part connects the front panel assembly <NUM> to one of the lateral pillars. In particular, the corner part <NUM> connects the front panel assembly <NUM> to the lateral pillar <NUM>. Thus, the bottom edge <NUM> is adjacent to the front panel assembly <NUM>, while the edge <NUM> is adjacent to the lateral pillar <NUM>.

At a left lateral side of the vehicle cab <NUM>, the vehicle cab <NUM> comprises a door <NUM>, including, successively in the direction Z1, a door panel <NUM> and a side window <NUM>, and a mirror assembly <NUM>, preferably carried by the door <NUM>, including a mirror arm <NUM> carrying mirrors <NUM>. When closed, the door <NUM>, including the door panel <NUM> and the side window <NUM>, is substantially perpendicular to direction Y1. The mirror assembly <NUM> protrudes from the door <NUM> substantially in the direction Y1 and is for example attached at a door front pillar of the door <NUM>, said door front pillar being directed substantially parallel to direction Z1 and delimiting the side window <NUM> in the direction X1. In the direction Z1, the lateral window <NUM> may extend from the wiper panel assembly <NUM> to a top edge of the windscreen <NUM>, along the lateral pillar <NUM>.

At a right lateral side of the vehicle cab <NUM>, similar features than on the left side may be provided symmetrically.

Preferably, each corner part connects the central part <NUM> to the front pillar of the door of the lateral side. In particular, the corner part <NUM> connects the central part <NUM> to the front pillar of the door <NUM>. Thus, the rear edge <NUM> is preferably adjacent to the front pillar of the door <NUM>, or to the side window <NUM>. The outside panel <NUM> is positioned substantially at the same height than a bottom of the side window <NUM>, along direction Z1.

<FIG>, <FIG>, <FIG> and <FIG> show more detailed illustrations of the corner part <NUM>, according to an example.

The outside panel <NUM> of the corner part <NUM>, with the edges <NUM>, <NUM> and <NUM>, and the outside face <NUM>, are best visible in <FIG>. The inside face <NUM> of the outside panel <NUM> is visible in <FIG>.

As for this example, the outside panel <NUM> may be integral with an outside panel of the central part <NUM> of the wiper panel assembly <NUM>. In this example, the corner part <NUM> also comprises an inside part <NUM> assembled with the outside panel <NUM> and best visible in <FIG> and in <FIG>. The inside part <NUM> is assembled at the inside face <NUM> of the outside panel <NUM>, so that the outside panel <NUM> and the inside part <NUM> are fixed to one another. <FIG> shows the inside part <NUM> without the outside panel <NUM>.

The inside part <NUM> forms a gutter <NUM>, at the inside face <NUM> along the top edge <NUM>. The gutter <NUM> is to be fitted between the windscreen <NUM> and the outside panel <NUM>, along the bottom edge <NUM> of the windscreen, from the central part <NUM> of the wiper panel assembly <NUM> to the corner <NUM> of the windscreen <NUM>. The gutter <NUM> forms a bottom of the gap defined between the top edge <NUM> and the bottom edge <NUM> of the windscreen <NUM>, for retrieving the drained liquids, in particular including rainwater and/or windshield washer fluid.

As best visible in <FIG> and <FIG>, the corner part <NUM> comprises a drain <NUM>, having an inlet <NUM>, an outlet <NUM> and a channel <NUM>. The channel <NUM> connects the inlet <NUM> to the outlet <NUM>, so that the drained liquids may be admitted into the drain <NUM> via inlet <NUM>, then flow through the channel <NUM> and then exit the drain <NUM> via the outlet <NUM>.

As best visible in <FIG> and <FIG>, the channel <NUM> is partially formed by the inside part <NUM> and by inside face <NUM> of the outside panel <NUM>. The channel <NUM> is a tubular duct fluidly connecting the inlet <NUM> and the outlet <NUM>. The channel <NUM> is preferably straight or very slightly curved. The channel <NUM> is preferably entirely formed at the inside face <NUM> of the outside panel <NUM>, so as not to be visible from the outside of the vehicle cab <NUM>. The channel <NUM> is preferably oriented parallel to the directions X1 and Z1 in an oblique manner. In use, when the vehicle is at cruise speed such as <NUM>-90kph, the drained liquids may flow from the inlet <NUM> to the outlet <NUM> through the channel <NUM>, in an oblique flow direction, pointing towards the frontward direction X1 and opposite to the upper direction Z1. In other words, inside the drain <NUM>, the flow is directed frontwards and downwards. This particular orientation of the channel <NUM>, and relative arrangement of the outlet <NUM> and of the inlet <NUM>, preferably enable that the flow of drained liquids exits the outlet <NUM> of the drain <NUM> in a direction oriented opposite to the direction Z1, i.e. downwards.

The inlet <NUM> is an opening formed at the inside face <NUM>, connected at one end of the channel <NUM> at the inside face <NUM>. The inlet <NUM> opens in the upward direction Z1. As the inlet <NUM> opens upward, drained liquids may be received in the drain <NUM> by falling into the inlet <NUM>. Preferably, the inlet <NUM> is funnel-shaped, for better catching of the drained liquids.

The inlet <NUM> is preferably formed close to the top edge <NUM> or at the top edge <NUM> and close to the rear edge <NUM>. In use, the inlet <NUM> is interposed between the windscreen <NUM> and the inside face <NUM> of the outside panel <NUM>. The inlet <NUM> is preferably formed at an end of the gutter <NUM>, so as to be located at the bottom corner <NUM> of the windscreen <NUM>, between the windscreen <NUM> and the outside panel <NUM>. Liquids drained by the gutter <NUM> may flow to the end of the gutter <NUM> and end up into the inlet <NUM>.

Here at least part of the inlet <NUM> is formed by the inside part <NUM>. The other part of the inlet <NUM> is formed by the inside face <NUM>.

The outlet <NUM> is an opening. The outlet <NUM> is connected to an end of the channel <NUM> at the inside face <NUM>, opposite to the end at which the inlet <NUM> is formed. The outlet <NUM> opens at the outside face <NUM>. In other words, the drain <NUM> crosses through the outside panel <NUM> at the outlet <NUM>. Along the outside panel <NUM>, the outlet <NUM> is located between the inlet <NUM> and the bottom edge <NUM> and the inlet <NUM> is located between the outlet <NUM> and the rear edge <NUM>. In other words, the inlet <NUM> is located in the upward direction Z1 relative to the outlet <NUM> and the outlet <NUM> is located in the frontward direction X1 relative to the inlet <NUM>. The respective positions of the inlet <NUM> and of the outlet <NUM> promote that the flow of drained liquids flows from the inlet <NUM> to the outlet <NUM>, because a lower pressure may be obtained at the outlet <NUM> than at the inlet <NUM> when the vehicle <NUM> is at cruise speed, or even at lower speeds. The outwardly curved shape of the outside face <NUM> may contribute to obtain the lower pressure at the outlet <NUM>, by Bernoulli's effect.

As shown in <FIG>, <FIG> and <FIG>, the outlet <NUM> is preferably funnel-shaped, i.e. jet shaped, for contributing to direct the exiting flow of drained liquids downwards. The funnel-shaped outlet <NUM> is preferably oriented substantially in the rearward direction X'<NUM> or lateral direction Y1.

In detail, the funnel-shaped outlet <NUM> may have a front wall <NUM> and a rear wall <NUM>. As shown in <FIG>, the walls <NUM> and <NUM> are formed inwards from the outside face <NUM>, towards and end of the channel <NUM>. The end of the channel <NUM> emerges between the walls <NUM> and <NUM>, from upwards. Thus, the outlet <NUM> and the end of the channel <NUM> makes an elbow that impart a pressure drop to the flow of drained liquids. Starting said end of the channels <NUM>, the walls <NUM> and <NUM> are oriented divergently. The front wall <NUM> is oriented substantially perpendicular to the frontward direction X1 and a rear wall <NUM> oriented substantially perpendicular to the lateral direction Y1, said walls <NUM> and <NUM> delineating the outlet <NUM> between them and defining the funnel shape of the outlet <NUM>. Thus, at cruise speed, the wall <NUM> substantially protects the outlet <NUM> from the airflow directed in the direction X'<NUM> along the outside face <NUM>. However, due to the frontward position of the outlet <NUM>, the airflow may contribute in limiting the flow of drained liquids, so that said flow of drain liquids exits the outlet <NUM> substantially downwards.

When drained liquids flow from the channel <NUM> to the outlet <NUM>, the funnel-shaped outlet <NUM> and the walls <NUM> and <NUM> may cause a pressure decrease in the drained liquids flow at the outlet and may promote that the flowing of drained liquids is not reversed, in particular at cruise speed. The funnel-shaped or jet-shaped outlet <NUM> promotes a faster moving flow at the outlet <NUM> i. e with a lower pressure.

Other features may be implemented for promoting a lower pressure at the outlet, such as forming an airfoil at the outlet <NUM>.

The corner part <NUM> comprises two lateral wings <NUM> and <NUM>. Here, each wing <NUM> and <NUM> is formed integrally with the outside panel <NUM>. Each lateral wing <NUM> and <NUM> protrudes from the outside face <NUM> of the outside panel <NUM>, along direction Y1. Each wing <NUM> and <NUM> is oriented perpendicular to the outside panel <NUM>, in particular to the outside face <NUM> from which they protrude. Both wings <NUM> and <NUM> are positioned at the rear edge <NUM>. The wing <NUM> is positioned in the direction Z1 relative to the wings <NUM>, i.e. the wing <NUM> is an upper lateral wing, while the wing <NUM> is a lower lateral wing. The wing <NUM> is positioned at the top edge <NUM> and the wing <NUM> is positioned between the edges <NUM> and <NUM>, or at the edge <NUM>. Both wings <NUM> and <NUM> are directed parallel to the directions X1 and X'<NUM>, or are slightly inclined relative to these directions. Each wing <NUM> and <NUM> is preferably delta-shaped, has an oblique leading edge and a tailing edge perpendicular to direction X'<NUM>.

Preferably, the wing <NUM> and the inlet <NUM> are positioned at substantially the same height along direction Z1, the wing <NUM> being positioned in the direction X'<NUM> relative to the inlet <NUM>. Thus, the wing <NUM> may divert a flow of drained liquids coming from the windscreen <NUM> or the gutter <NUM> when the vehicle <NUM> is at higher speeds than the cruise speeds, such as <NUM>-130kph, or in case the drain <NUM> is clogged.

Preferably, the wing <NUM> and the outlet <NUM> are positioned at the same height along direction Z1, the wing <NUM> being positioned in the direction X'<NUM> relative to the outlet <NUM>. Thus, the wing <NUM> may divert a flow of drained liquids outgoing from the outlet <NUM> in particular when the vehicle <NUM> is at higher speeds than the cruise speeds, such as <NUM>-130kph, and preferably also at lower speeds.

As a variant, only one of the wings <NUM> and <NUM> may be provided, or more than two lateral wings may be provided.

<FIG> and <FIG> show more detailed illustrations of the corner part <NUM>, according to another example. Apart from the differences mentioned below, the exemplary corner part <NUM> of <FIG> and <FIG> has the same features than the exemplary corner part <NUM> of <FIG>, identified with the same reference numbers.

The corner part <NUM> of <FIG> and <FIG> comprises an outside panel <NUM>, having an outside face <NUM> visible in <FIG> and an inside face <NUM> visible in <FIG>, both extending substantially parallel to the upward direction Z1 and opposite to each other. The outside panel has a top edge <NUM>, delineating the faces <NUM> and <NUM> in direction Z1, a rear edge delineating the faces <NUM> and <NUM> in direction X'<NUM> and a bottom edge <NUM> delineating the faces <NUM> and <NUM> in a direction opposite to direction Z1. As for this example, the outside panel <NUM> may constitute a separate part from the outside panel of the central part <NUM> of the wiper panel assembly <NUM>. Thus, the outside panel may have a front edge <NUM> adjacent to the central part <NUM>, delineating the faces <NUM> and <NUM> in the direction X1 and connecting the edges <NUM> and <NUM>, opposite to the rear edge <NUM>.

Although not illustrated, the corner part of <FIG> and <FIG> may have an inside part with similar features than the inside part <NUM> shown in <FIG>, in particular including the gutter <NUM> and being assembled with the outside panel <NUM>.

The corner part <NUM> of <FIG> and <FIG> comprises a drain <NUM>, best visible on <FIG>. The drain <NUM> has an outlet <NUM>, opening at the outside face <NUM>, an inlet <NUM>, located at the inside face <NUM> and opening at the inside face <NUM> in the upward direction Z1. The features of the drain <NUM> for the example of <FIG> and <FIG> are the same than for the drain <NUM> of <FIG>, except that the drain <NUM> of <FIG> and <FIG> is integrally formed with the outside panel <NUM>, instead of being partly formed by the outside panel <NUM> and the inner part.

Contrary to the corner part <NUM> of <FIG>, the corner part <NUM> of <FIG> and <FIG> only has a single lateral wing <NUM>, while the other lateral wing <NUM> is not provided.

Contrary to the corner part <NUM> of <FIG>, the corner part <NUM> of <FIG> and <FIG> comprises a front wall <NUM>, protruding from the top edge <NUM> substantially in the upward direction Z1. The front wall <NUM> constitutes a tooth that protrudes from the top edge <NUM>. The front wall <NUM> is positioned close to the inlet <NUM> and is oriented transversally relative to the top edge <NUM>, i.e. oriented substantially parallel to direction Y1. The front wall <NUM> is directed in the direction X1. Preferably, the wall <NUM> is positioned in the direction X'<NUM> relative to the inlet <NUM> and at a short distance in the direction Z1 relative to the inlet <NUM>, as shown in <FIG>. Here the wall <NUM> is also positioned so as to protrude from the wing <NUM> in direction Z1. The wall <NUM> is preferably positioned along the lateral pillar <NUM>. When the vehicle <NUM> is at cruise speed, a slight air pressure buildup may form locally at the front wall <NUM> as the front wall <NUM> interrupts the airflow caused by the displacement of the vehicle <NUM> in direction X1. The pressure buildup is obtained over and/or at the rear relative to the inlet <NUM>. This higher pressure may promote introduction of the drained liquids into the inlet <NUM> at cruise speed, since the outlet <NUM> is at a lower pressure and draws the drained liquids.

Claim 1:
A corner part (<NUM>) for a wiper panel assembly (<NUM>) for a ground vehicle (<NUM>), the corner part (<NUM>) comprising:
- an outside panel (<NUM>), having an outside face (<NUM>) and an inside face (<NUM>) both extending substantially parallel to an upward direction (Z1) of the corner part (<NUM>) ; and
- a drain (<NUM>), having:
- an outlet (<NUM>), opening at the outside face (<NUM>),
- an inlet (<NUM>), located at the inside face (<NUM>) and opening at the inside face (<NUM>) in the upward direction (Z1), and
- a channel (<NUM>), connecting the inlet (<NUM>) to the outlet (<NUM>),
characterized in that the outlet (<NUM>) is located in a frontward direction (X1) relative to the inlet (<NUM>) and in that the frontward direction (X1) is perpendicular to the upward direction (Z1) and substantially parallel to the outside panel (<NUM>).