JP5685556B2 - Wheel loader and work machine tank - Google Patents

Description

  The present invention relates to a wheel loader and a tank of a work machine.

  A working machine driven by an engine is provided with a fuel tank for storing fuel to be supplied to the engine. For example, in the case of a wheel loader as the work machine, the fuel tank is attached to the lower surface of the rear vehicle body. That is, the wheel loader includes a front vehicle body having arms, buckets, front wheels, and the like, and a rear vehicle body having driver's cab, engine compartment, rear wheels, and the like. An engine is mounted on the frame of the rear vehicle body. The fuel tank is attached to the lower surface of the frame of the rear vehicle body (see Patent Document 1).

JP 2005-133492 A

  In order to prevent interference with obstacles on the ground, it is necessary to make the minimum ground height as high as possible. As described above, since the fuel tank is provided on the lower surface of the frame in the wheel loader, it is necessary to make the height of the lower surface of the fuel tank as high as possible in order to prevent interference with an obstacle on the ground. However, the height of the upper surface of the fuel tank is limited by the height of the lower surface of the frame of the wheel loader. For this reason, the fuel tank of the wheel loader has a smaller dimension in the height direction than the dimension in the front-rear and left-right directions.

  As described above, in the fuel tank of the wheel loader, since the area of the horizontal portion on the upper surface becomes large, it becomes difficult for the air in the fuel tank to escape to the outside during refueling. For this reason, there exists a possibility that malfunctions, such as a fuel blowing back from an oil supply opening at the time of refueling, may arise.

(1) A wheel loader according to the invention of claim 1 includes four tires, front, rear, left and right, a vehicle body supported by the tires and bendable, a front frame and a rear frame constituting the vehicle body, and a rear frame. A driver's cab provided on the front side, an engine compartment provided on the rear side of the rear frame, an arm provided to be rotatable in the vertical direction with respect to the front frame, and provided to be rotatable at the tip of the arm. A wheel loader comprising a bucket and a fuel tank provided on the rear lower side of the rear frame, the fuel tank being attached to the top plate covering the upper surface of the tank and the top plate A top plate holding member that is bent and held convex toward the top, and an air vent that guides the air in the fuel tank collected on the lower surface of the top plate that is bent upward by the top plate holding member to the outside And having It is characterized by that.
(2) The invention according to claim 2 is the wheel loader according to claim 1, wherein the top plate holding member is provided with a concave portion formed in a concave shape that is recessed upward, and the concave portion is provided on the top surface of the top plate. The top plate is welded and bent upward along the shape of the recess, and the air vent is provided in the vicinity of the most recessed position of the recess with respect to the top plate.
(3) The invention according to claim 3 is the wheel loader according to claim 1 or 2, wherein the fuel tank is provided with a plurality of mounting mounts for mounting on the lower rear side of the rear frame. At least one of the above is provided on the top surface of the top plate.
(4) The invention according to claim 4 is the wheel loader according to claim 3, wherein at least one of the mounting mounts is attached to the upper surface of the tank upper plate by welding at a position separated from the top plate holding member. It is characterized by that.
(5) The invention according to claim 5 is the wheel loader according to any one of claims 1 to 4, wherein the fuel tank is viewed from above or below among the respective projected areas viewed from the top, bottom, left, and right and left and right directions. In this case, the projected area is maximized.
(6) The tank of the working machine according to the invention of claim 6 is a tank for storing a liquid, which is mounted on the working machine, and is attached to the top plate and covering the top surface of the tank. A top plate holding member that is bent upward and convexly held, and an air vent that guides the air in the container gathered on the bottom surface of the top plate that is convexly convex upward by the top plate holding member to the outside It is characterized by having.

(1) In the wheel loader according to the invention of claim 1, the fuel tank is attached to the top plate that covers the upper surface of the tank, and the top plate is held by bending the top plate in a convex shape upward. A member and an air vent for guiding the air in the fuel tank gathered on the lower surface of the top plate bent upwardly by the top plate holding member to the outside are configured. As a result, the top plate can be bent with a simple structure, and the air in the fuel tank can be collected at the bottom of the air vent and guided to the outside, and the production process of the fuel tank is not complicated, thus suppressing an increase in cost. it can.
(2) The tank of the working machine according to the invention of claim 5 includes a top plate that covers the upper surface of the tank, a top plate holding member that is attached to the top plate and holds the top plate in a convex shape upward. And an air vent that guides the air in the container gathered on the lower surface of the top plate bent upwardly by the top plate holding member to the outside. Thereby, the top plate can be bent with a simple configuration, and the air in the tank can be collected at the lower part of the air vent and guided to the outside, and the production process of the tank is not complicated, so that an increase in cost can be suppressed.

It is a side view of the wheel loader concerning this embodiment. It is a perspective view of a fuel tank. It is a perspective view which shows the attachment state to the flame | frame of a fuel tank. It is a perspective view which shows the attachment state to the flame | frame of a fuel tank. It is a figure explaining the state by which the upper board of a fuel tank is bent and convex upwards by the baffle board. It is a figure which shows a modification. It is a figure which shows a modification.

  With reference to FIGS. 1-5, one Embodiment of the tank of the wheel loader and work machine by this invention is described. FIG. 1 is a side view of the wheel loader according to the present embodiment. The wheel loader 100 includes a front vehicle body 110 having an arm 111, a bucket 112, a tire 113, and the like, and a rear vehicle body 120 having an operator cab 121, an engine compartment 122, a tire 123, and the like. The engine compartment 122 is covered with a building cover 131. An engine (not shown) is attached to the frame 150 of the rear vehicle body 120 inside the engine chamber 122. A counterweight 124 is attached to the rear portion of the rear vehicle body 120, that is, the rear portion of the frame 150. A fuel tank 200, which will be described in detail later, is attached to the rear lower surface of the frame 150.

  The arm 111 is turned up and down (up and down) by driving an arm cylinder (not shown), and the bucket 112 is turned up and down (dumped or clouded) by driving the bucket cylinder 115. The front vehicle body 110 and the rear vehicle body 120 are pivotally connected to each other by a center pin 101, and the front vehicle body 110 is refracted left and right with respect to the rear vehicle body 120 by expansion and contraction of the steering cylinder 116. For convenience of explanation, the present embodiment defines the front-rear and left-right directions and the up-down direction as described in the respective drawings. In FIG. 1, the back side of the paper surface is the right direction, and the front side of the paper surface is the left direction. In the following description, it is assumed that the wheel loader 100 is placed on a horizontal and flat ground.

  FIG. 2 is a perspective view of the fuel tank 200, and FIGS. 3 and 4 are perspective views showing how the fuel tank 200 is attached to the frame 150. 3 and 4, details of a breather hose 212 and the like which will be described later are omitted. The fuel tank 200 is made of a steel material such as iron, and the top plate (or top plate) 201 that covers the upper surface of the fuel tank 200, the bottom plate 202 that is the bottom surface, the right side plate 203 that is the left and right side surfaces, and the left side. Side plate 204, a front plate 205 as a front surface, and a rear plate 206 as a rear surface. When the fuel tank 200 is attached to the frame 150, the upper plate 201 is substantially horizontal, the bottom plate 202 is inclined so as to be lowered downward toward the front, and the side plates 203, 204, the front plate 205, and the rear plate 206 are substantially vertical. .

  Attachment mounts 207 for attaching the fuel tank 200 to the frame 150 are respectively provided on the right front portion and the left front portion of the substantially horizontal portion of the upper plate 201. The mounting mount 207 has a thick plate shape. Attachment mounts 208 for attaching the fuel tank 200 to the frame 150 are provided on the upper right portion and the upper left portion of the rear plate 206, respectively. The mounting mount 208 is a member having a substantially L-shaped cross section having a portion extending in the vertical direction and a portion extending in the front-rear direction. The portion extending in the vertical direction of the mounting mount 208 is joined to the rear plate 206 by welding, and the portion (upper surface) extending in the front-rear direction is in contact with the lower surface of the frame 150 and fastened to the frame 150 with bolts 155. . That is, the fuel tank 200 is attached to the frame 150 by bringing the upper surfaces of the mounting mounts 207 and 208 into contact with the lower surface of the frame 150 and fastening the frame 150 and the mounting mounts 207 and 208 with the bolts 155.

  From the rear part of the upper plate 201, a fuel filler port 209 for feeding fuel to the fuel tank 200 protrudes rearward and upward. A breather 211 for allowing air to flow inside and outside the fuel tank 200 is attached to the upper surface of the upper plate 201. A breather hose 212 is connected to the breather 211. That is, the fuel tank 200 is configured such that air enters and exits through the breather 211 and the breather hose 212.

  In the hall loader 100, in order to prevent interference with obstacles on the ground, it is necessary to make the ground minimum height as high as possible. Therefore, the fuel tank 200 attached to the lower surface of the frame 150 needs to have the lower surface (bottom plate 205) separated from the ground as much as possible. However, the height of the upper surface (upper plate 201) of the fuel tank 200 is limited by the height of the lower surface of the frame 150. For this reason, the fuel tank 200 has a smaller dimension in the height direction than the dimension in the front-rear and left-right directions, and the projected area when viewed from above or below is larger than the projected area when viewed from the front-rear direction or the left-right direction. The shape is also larger.

  And since the area of the horizontal part of the upper board 201 becomes larger than the area of the side plates 203 and 204, the front board 205, and the rear board 206, the air in the fuel tank 200 is hard to gather in one place as it is. For this reason, the air in the fuel tank 200 is difficult to escape to the outside through the breather 211 and the breather hose 212 during refueling, which may cause problems such as fuel blowing back from the refueling port 209 during refueling. Therefore, in this embodiment, the baffle plate 250 shown in FIG. 5 is attached to the upper surface of the upper plate 201.

  The baffle plate 250 is a top plate holding member that holds the upper plate (top plate) 201 by bending it upward in a convex shape, and extends in the left-right direction. The warping plate 250 exhibits a substantially square cross section when cut along a plane extending in the up / down and front / rear directions (see FIGS. 2 to 5). The warping plate 250 is erected over substantially the entire width of the fuel tank 200 in the vicinity of the center in the front-rear direction in the substantially horizontal portion of the upper plate 201. The baffle plate 250 includes a substantially horizontal upper surface 251 and a lower surface 252 formed in a concave shape that is recessed upward. In this way, when viewed from the front-rear direction, the lower surface 252 is formed in a gently curved shape that is recessed upward as it goes from the left-right end side to the vicinity of the center in the left-right direction. The height h1 near the center of the direction is the lowest, and the height h2 near the left and right ends is the highest (FIG. 5). In addition, since the shape of the fuel tank 200 is substantially symmetrical on the left and right, the shape of the baffle plate 250 is also substantially symmetrical on the left and right.

  By joining the lower surface 252 of the warping plate 250 and the upper surface of the upper plate 201 by welding, the upper plate 201 bends upward along the shape of the lower surface 252 in a convex shape. Therefore, when fuel is injected into the fuel tank 200, the air in the fuel tank 200 moves toward the highest portion of the lower surface of the upper plate 201 by being bent upward by the baffle plate 250. get together. The breather 211 is provided in the vicinity of a position where the upper plate 201 is recessed most upward in the baffle plate 250. That is, the breather 211 is attached so as to guide the air in the fuel tank 200 gathered on the lower surface of the upper plate 201 bent upwardly by the baffle plate 250 to the outside.

  As a result, the air in the fuel tank 200 is smoothly discharged to the outside through the breather 211 and the breather hose 212 at the time of refueling, so that problems such as fuel blowing back from the fuel fill port 209 at the time of refueling can be prevented.

  As described above, the mounting mount 207 having a thick plate shape is provided in the horizontal portion of the upper plate 201 in the vicinity of the front left and right ends (hereinafter simply referred to as the vicinity of the front left and right ends). It is joined to the upper surface of this by welding. In the vicinity of the left and right ends of the front portion of the upper plate 201, the side plate 203 or the side plate 204 to which the upper plate 201 is attached is affected by the front plate 205 and the front plate 205 is separated from the baffle plate 250. The influence of the bending (deformation) of the upper plate 201 is reduced. Therefore, in the vicinity of the left and right ends of the front portion of the upper plate 201, the posture of the mounting mount 207 is hardly affected by the bending of the upper plate 201 by the baffle plate 250. Therefore, even if the upper surface and the lower surface of the mounting mount 207 remain parallel, the mounting of the fuel tank 200 to the frame 150 is not affected. That is, there is no need to change the angle formed between the upper surface and the lower surface, and the manufacturing cost of the mounting mount 207 can be suppressed.

  In the vicinity of the left and right ends of the rear portion of the upper plate 201, the side plate 203 or the side plate 204 to which the upper plate 201 is attached is affected by the rear plate 206, and because it is away from the baffle plate 250, the baffle plate 250. The influence of the bending (deformation) of the upper plate 201 due to is reduced. Therefore, even if the mounting mount 207 is provided in the vicinity of the left and right ends of the rear portion of the upper plate 201, the posture of the mounting mount 207 is not easily affected by the bending of the upper plate 201 by the baffle plate 250. Therefore, even when the mounting mount 207 is provided near the left and right ends of the rear portion of the upper plate 201, the same operation and effect as when the mounting mount 207 is provided near the left and right ends of the front portion of the upper plate 201 as described above. Play.

That is, in this embodiment, the following operational effects are achieved.
(1) The upper plate 201 is configured to be bent upward in a convex shape and held by the warp plate 250. Then, the air in the fuel tank 200 collected on the lower surface of the upper plate 201 that is bent upward by the baffle plate 250 is guided to the outside through the breather 211 and the breather hose 212. Accordingly, the substantially horizontal upper plate 201 can be bent with a simple configuration to collect the air in the fuel tank 200 under the breather 211 and guide it to the outside, and the production process of the fuel tank 200 is not complicated. Therefore, an increase in cost can be suppressed.

(2) The lower surface 252 of the warping plate 250 is formed in a gently curved shape that is recessed upward as it goes from the left and right end sides to the vicinity of the center in the left and right direction when viewed from the front and rear direction. The upper surface was joined by welding. The breather 211 is provided in the vicinity of the upper plate 201 near the most recessed position on the baffle plate 250. Thereby, the structure of the baffle plate 250 can be simplified, and the air in the fuel tank 200 can be efficiently guided to the outside. That is, it is possible to improve the exhaust efficiency of the air in the fuel tank 200 at the time of refueling, while keeping the production cost of the baffle plate 250 itself and the installation cost of the baffle plate 250 low.

(3) The mounting mount 207 having a thick plate shape is provided in the vicinity of the front left and right ends of the upper plate 201. Accordingly, it is not necessary to provide a tank mounting space in front of the tank front plate 205 as compared with the case where the tank front mounting mount 207 is mounted on the tank front plate 205 in the same shape as the rear mounting mount 208. Therefore, the freedom of the attachment position of the fuel tank 200 can be improved.

(4) Since the projected area when the fuel tank 200 is viewed from above or below is larger than the projected area when viewed from the front-rear direction or the left-right direction, the air in the fuel tank 200 remains as it is. However, it is difficult for the air in the fuel tank 200 to escape to the outside during refueling. However, in the present embodiment described above, the upper plate 201 is bent and held in a convex shape upward by the baffle plate 250 and gathered on the lower surface of the upper plate 201 that is bent upward in a convex shape. The air in the fuel tank 200 was configured to be guided to the outside through the breather 211 and the breather hose 212. As a result, even if the fuel tank 200 has a shape that makes it difficult for the air in the fuel tank 200 to gather in one place as it is and the air in the fuel tank 200 is difficult to escape to the outside during refueling, the air in the fuel tank 200 Can be efficiently guided to the outside. Therefore, since the fuel tank 200 that is restricted in shape to be disposed in a limited space can be used, the fuel tank 200 and the wheel loader 100 can be efficiently disposed.
(5) On the upper surface of the tank upper plate 201, the mounting mount 207 is attached to a position separated from the top plate holding member 250 by welding. As a result, the top plate holding member 250 does not hinder the deformation of the upper plate 201 into the convex shape. The above-mentioned spaced position means a region where the amount of deformation of the upper plate 201 due to welding of the top plate holding member 250 is small. In such an area, the upper plate 201 that is slightly deformed and the lower surface of the mounting frame 207 are in sufficient contact with each other, so even if the mounting frame 207 whose upper and lower surfaces are processed in parallel is used, that is, without incurring costs. Installation is not affected.

---- Modified example ---
(1) In the above description, the number of the baffle plates 250 provided on the upper plate 201 is one, but the present invention is not limited to this, and two or more baffle plates 250 may be provided on the upper plate 201. .

(2) In the above description, the extending direction of the baffle plate 250 is the left-right direction. However, the present invention is not limited to this, and the extending direction of the baffle plate 250 may be the front-rear direction. Also, it may be an oblique front-rear direction (oblique left-right direction) inclined to the left and right.

(3) In the above description, the baffle plate 250 is disposed near the center of the horizontal portion of the upper plate 201 in the direction (ie, the front-rear direction) orthogonal to the direction in which the baffle extends (ie, the left-right direction). The present invention is not limited to this, and may be deviated in an orthogonal direction (that is, the front-rear direction) as long as there is no problem in exhausting air in the fuel tank 200.

(4) The shape of the warping plate 250 may be symmetric in the left-right direction or may not be symmetric in the left-right direction. That is, if there is no problem in exhausting air in the fuel tank 200, the position at which the height of the baffle plate 250 is the lowest (the position at which the thickness in the vertical direction is the smallest, that is, the most concave upward toward the baffle plate 250). Position) may be shifted to the right or left from the center in the left-right direction.

(5) In the above description, the breather 211 is provided near the upper plate 201 in the vicinity of the most concave position on the baffle plate 250, but the present invention is not limited to this. If there is no problem in exhausting the air in the fuel tank 200, for example, the breather 211 may be provided at a position shifted from the above position. Two or more breathers 211 may be provided.

(6) In the above description, the two left and right mounting mounts 207 are provided on the upper surface of the upper plate 201, but the present invention is not limited to this. For example, if at least one of the mounting mounts 207 is provided on the upper surface of the upper plate 201, there is an effect that the degree of freedom of the mounting position of the fuel tank 200 can be increased as described above. Further, if both the rear mounting mount 208 of the fuel tank 200 have the same shape as the front mounting mount 207 and are provided on the upper surface of the upper plate 201, the installation space behind the tank is not required, and the fuel tank 200 is mounted. There exists an effect that the freedom degree of a position can be raised further. In other words, by providing the mounting member between the tank upper plate 201 and the frame 150, it is not necessary to provide a tank mounting space in front and / or rear of the tank 200, and the degree of freedom of tank installation can be increased. .
In the present invention, it is not essential to provide the mounting mount 207 or the mounting mount 208 on the upper surface of the upper plate 201.

(7) In the above description, the lower surface 252 of the baffle plate 250 is formed in a concave shape that is recessed upward, and the lower surface 252 and the upper surface of the upper plate 201 are joined together by welding, so that the upper plate 201 is bonded to the lower surface 252. However, the present invention is not limited to this. For example, as shown in FIG. 6, a baffle plate 260 provided with a protrusion 263 that protrudes downward at the approximate center of the lower surface 262 in the left-right direction may be used. Then, the left and right ends of the baffle plate 260 are welded and fixed to the side plates 204 and 203, respectively, and the protrusion 263 is welded to the upper surface of the upper plate 201 to hold the substantially center in the left and right direction of the upper plate 201 upward. By doing so, you may comprise so that the upper board 201 may be bent and convex toward upper direction.

  Further, for example, each unit may be configured as shown in FIG. That is, an upper plate lifting beam 151 that extends in the left-right direction and is fixed to the frame 150 by welding, bolting, or the like is provided above the fuel tank 200. An upper plate lifting boss 270 provided with a female screw is attached to the upper surface of the upper plate 201. Then, the upper plate lifting bolt 271 is inserted from above the through hole (not shown) provided in the upper plate lifting beam 151 and screwed into the female screw of the upper plate lifting boss 270. By pulling up the lifting boss 270 and the upper plate 201 with the upper plate lifting bolt 271, the upper plate 201 is bent upward and held in a convex shape as indicated by a two-dot chain line in FIG. 7. You may comprise. When there is already a member that can be used in place of the upper plate lifting beam 151 such as a radiator frame, the member may be used in place of the upper plate lifting beam 151.

(8) Although the fuel tank 200 of the wheel loader 100 has been described in the above description, the present invention is not limited to this. For example, in addition to the wheel loader 100, the present invention may be applied to other work machines such as a hydraulic excavator, a mobile crane, a forklift, a soil improvement machine, and a recycling work. In addition, the present invention is not limited to the fuel tank 200, but may be used for various liquid tanks other than fuel, such as hydraulic fluids, lubricating oils, raw materials and additives in various working machines such as a soil conditioner and a recycling machine. May be applied.

(9) In the above description, the material of the fuel tank 200 is a steel material such as iron, but the present invention is not limited to this. The material of the fuel tank 200 is not limited to iron, but may be another steel material such as stainless steel, a resin other than the steel material, or a composite material such as FRP.
(10) Each embodiment and modification described above may be combined.

The present invention is not limited to the above-described embodiment, and includes four tires, front, rear, left and right, a vehicle body supported by the tires and bendable, and a front frame and a rear frame constituting the vehicle body. A driver's cab provided on the front side of the rear frame, an engine compartment provided on the rear side of the rear frame, an arm provided to be rotatable in the vertical direction with respect to the front frame, and a tip of the arm A wheel loader including a bucket provided rotatably and a fuel tank provided on the lower rear side of the rear frame, the fuel tank being attached to the top plate and a top plate covering the upper surface of the tank. The top plate holding member that holds the top plate bent upward convexly, and the air in the fuel tank collected on the bottom surface of the top plate that is bent upward convex by the top plate holding member Air vent that leads to the outside It is intended to include wheel loader various structures and having a part.
Further, the present invention is not limited to the above-described embodiment, and is a tank for storing liquid, which is mounted on a work machine, and is attached to the top plate covering the upper surface of the tank and the top plate. A top plate holding member that bends and holds the top plate in a convex shape upward, and air inside the container gathered on the bottom surface of the top plate that is bent upward by the top plate holding member. And a tank of a working machine having various structures, characterized in that it has an air vent part that leads to the air.

100 wheel loader, 110 front car body, 120 rear car body, 150 frame, 200 fuel tank, 201 top plate (or top plate), 207, 208 mounting mount, 211 breather, 250, 260, 270 baffle plate, 252 bottom surface

Claims (6)

Four tires on the front, rear, left and right,
A vehicle body supported by the tire and bendable;
A front frame and a rear frame constituting the vehicle body;
A cab provided on the front side of the rear frame;
An engine room provided on the rear side of the rear frame;
An arm provided to be rotatable in the vertical direction with respect to the front frame;
A bucket rotatably provided at the tip of the arm;
A wheel loader comprising a fuel tank provided on the lower rear side of the rear frame,
The fuel tank is
A top plate covering the upper surface of the tank;
A top plate holding member that is attached to the top plate and holds the top plate bent upward in a convex shape; and
A wheel loader comprising: an air vent part that guides the air in the fuel tank gathered on a lower surface of the top plate that is bent upwardly by the top plate holding member. The wheel loader according to claim 1,
The top plate holding member has a concave portion formed in a concave shape recessed upward, and the concave portion is welded to the top surface of the top plate, and the top plate is moved upward along the shape of the concave portion. It is bent toward
The wheel loader is characterized in that the air vent is provided in the vicinity of the most recessed position of the recess with respect to the top plate. The wheel loader according to claim 1 or 2,
The fuel tank is provided with a plurality of mounting mounts for mounting on the rear lower side of the rear frame,
At least one of the mounting mounts is provided on an upper surface of the top plate. The wheel loader according to claim 3,
At least one of the mounting mounts is mounted on the upper surface of the tank upper plate by welding at a position spaced from the top plate holding member. In the wheel loader according to any one of claims 1 to 4,
The wheel loader is characterized in that the fuel tank is formed in a shape in which the projected area when viewed from above or below is the largest among the projected areas viewed from the top, bottom, left, right, front and rear directions. It is a tank for liquid that is mounted on a work machine,
A top plate covering the upper surface of the tank;
A top plate holding member that is attached to the top plate and holds the top plate bent upward in a convex shape; and
A tank for a working machine, comprising: an air vent part that guides the air in the container gathered on a lower surface of the top plate that is bent upwardly by the top plate holding member.

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