JP7374881B2 - Work vehicle frame structure - Google Patents

Description

The present invention relates to a frame structure for a work vehicle.

For example, in a combine harvester, a reaping device is disposed at the forefront, and a body frame is provided behind the reaping device. The body frame includes a track frame to which a traveling device is attached, and a main frame to which an engine and the like are attached. The main frame is provided above the truck frame and is connected to the truck frame by a connecting member.

Japanese Patent Application Publication No. 11-137055

In such a frame structure, in order to ensure strength, the main frame and the truck frame must be connected using a heavy connecting member, which increases cost.

An object of the present invention is to provide a frame structure for a work vehicle that can reduce the weight of a connecting member that connects a main frame and a truck frame.

In order to achieve the above object, a frame structure for a work vehicle according to one aspect of the present invention is a frame structure for a work vehicle, which includes a main frame to which a heavy object is assembled and supports the heavy object at a support portion. , a truck frame to which the traveling device is assembled and supporting the wheels of the traveling device by a wheel shaft; and a connecting member that connects the main frame and the truck frame and supports the main frame above the truck frame. The member has a reinforcing portion configured to transmit stress generated at the support portion to the wheel shaft.

In this frame structure, the main frame to which the heavy object is assembled is provided above the truck frame to which the traveling device is assembled, and is connected to the truck frame by a connecting member. The main frame is provided with a support portion that supports a heavy object. The truck frame is provided with a wheel shaft that supports the wheels of the traveling device. Since the connecting member has the reinforcing portion, stress generated in the support portion due to the inertia of the heavy object is transmitted to the wheel shaft when the work vehicle runs or turns. This increases the rigidity of the frame structure against the stress generated in the support portion, making it possible to reduce the weight of the connecting member while ensuring the necessary rigidity.

The reinforcing portion may be configured such that stress generated at the supporting portion is transmitted linearly to the wheel shaft. Thereby, the stress generated in the support portion can be transmitted to the wheel shaft in a good manner, and the rigidity of the frame structure against the stress generated in the support portion can be further improved.

The reinforcing portion may have a surface along a straight line passing through the vicinity of the support portion and the vicinity of the rolling wheel axis. In this case, the stress generated in the support portion is propagated through that surface, so that the stress can be linearly transmitted from the vicinity of the support portion to the vicinity of the wheel shaft.

The reinforcing portion may be configured to form a surface that connects from the vicinity of the support portion to the vicinity of the rolling wheel shaft. The stress generated in the support portion is transmitted to the vicinity of the wheel shaft by propagating through a surface connecting the vicinity of the support portion to the vicinity of the wheel shaft. Thereby, the stress generated in the support portion can be transmitted to the wheel shaft in a good manner.

The connecting member has a connecting portion extending in the left-right direction and leg portions extending from the connecting portion toward the left and right truck frames, and the lower end of the leg is connected to the truck frame at a position higher than the lower end of the truck frame. It is preferable that the

In this configuration, compared to a configuration where the lower edge of the leg is located at the same height as the lower edge of the truck frame, the height of the connection is Since the position is raised, mud removal performance (mud protection performance) is improved.

The connecting member is provided at a relatively front position and a relatively rear position, and the front connecting member and the rear connecting member may have the same configuration.

When the work vehicle is configured to include an engine and a crop tank for storing crops harvested in harvesting operations, the support portions are provided at a relatively front position and a relatively rear position, and the support portion is provided at a relatively front position and a relatively rear position, and The rear support portion may support the engine and the rear support portion may support the crop tank.

According to the present invention, it is possible to reduce the weight of the connecting member that connects the main frame and the truck frame.

FIG. 1 is a perspective view of the fuselage frame of the combine harvester according to the first embodiment of the present invention, seen from the front right side. It is a view (right side view) of the fuselage frame as seen from the right side. FIG. 3 is a view (front view) of the fuselage frame as seen from the front side. FIG. 3 is a view (rear view) of the fuselage frame as seen from the rear side. It is a perspective view seen from the right front side of the fuselage frame of the combine concerning a 2nd embodiment of the present invention. It is a view (right side view) of the fuselage frame as seen from the right side. FIG. 3 is a view (front view) of the fuselage frame as seen from the front side. FIG. 3 is a view (rear view) of the fuselage frame as seen from the rear side.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

<First embodiment>
FIG. 1 is a perspective view of a fuselage frame 1 of a combine harvester according to a first embodiment of the present invention, viewed from the front right side. FIG. 2 is a view of the fuselage frame 1 seen from the right side (right side view). FIG. 3 is a diagram of the fuselage frame 1 seen from the front side (front view). FIG. 4 is a diagram of the fuselage frame 1 seen from the rear side (rear view).

A combine harvester is a work vehicle used for grain harvesting work. When harvesting grain with a combine harvester, as the combine moves forward, a reaping device reaps the grain culms planted in the field, and a threshing device supplies the tips of the grain culms reaped by the reaping device to the handling room. and thresh it. The paddy that has been removed from the grain culm by the threshing device is transported to a grain tank and stored therein. The combine harvester also includes an engine that serves as a power source of various types, a driver's seat where a driver is seated, a cabin that accommodates operating members such as operating levers, and the like.

In a combine harvester, a reaping device is arranged at the forefront, and a body frame 1 is provided behind it. The body frame 1 includes a main frame 2 and a pair of left and right track frames 3.

The main frame 2 is a skeleton (pipe frame) made up of a plurality of pipe materials 11 extending in the front-rear direction and a plurality of pipe materials 12 extending in the left-right direction. An engine, a cabin, a threshing device, and a grain tank are assembled and supported on the main frame 2. The engine is assembled on the center of the front end of the main frame 2 in the left-right direction (vehicle width direction). The cabin is assembled onto the right front end of the main frame 2 at a position to the right front of the engine. The threshing device is assembled on the left side portion of the main frame 2. The grain tank is mounted on the right side of the main frame 2 at a position behind the cabin.

A bracket 13 for supporting the engine is provided on the main frame 2 at a position where the engine is disposed. Furthermore, a bracket 14 for supporting the grain tank is provided on the main frame 2 at a position where the grain tank is arranged.

The truck frame 3 includes a main body portion 21 and a plurality of wheel shafts 22 . The main body portion 21 extends in the front-rear direction and is fabricated, for example, by welding pipe materials 23 and 24 stacked one above the other. The plurality of wheel shafts 22 protrude outward from the lower pipe material 24 in the left-right direction, and are arranged in a line with intervals in the front-rear direction. A crawler traveling device is assembled to the truck frame 3, and a roller of the crawler traveling device is rotatably supported on each wheel shaft 22.

Further, the fuselage frame 1 is provided with connecting members 4F and 4R connecting the main frame 2 and the track frame 3 at two locations, front and rear. The front connecting member 4F is provided at a position in front of the bracket 13 for supporting the engine, and the rear connecting member 4R is provided at a position in the front-rear direction between the bracket 13 and the bracket 14 for supporting the grain tank. It is located approximately in the middle.

The connecting members 4F and 4R have the same configuration, and as shown in FIGS. 3 and 4, a connecting portion 31 extending in the left-right direction, and leg portions 32 extending from the connecting portion 31 toward the left and right truck frames 3, respectively. It has 33 integrally. The length of the connecting part 31 in the left-right direction is shorter than the distance in the left-right direction between the left and right truck frames 3, and the legs 32 and 33 are arranged in the vertical direction so that the lower part of the connecting part 31 approaches the truck frame 3. It extends at an angle to the

The left leg 32 has a front side 41, a rear side 42, a left side 43, a right side 44, and a lower side 45. The left side surface 43 extends downward from the connecting portion 31 and is bent and extended downward to the left. The right side surface 44 extends from the connecting portion 31 at the same slope as the sloped portion of the left side surface 43 . The left leg 32 is connected to the left truck frame 3, and the lower surface 45 is located at a higher position than the lower surface of the truck frame 3.

The right leg 33 has a configuration that is symmetrical with the left leg 32 (left-right inverted configuration), and has a front side surface 51, a rear side surface 52, a left side surface 53, a right side surface 54, and a lower surface 55. The right side surface 54 extends downward from the connecting portion 31 and extends downwardly and to the right. The left side surface 53 extends from the connecting portion 31 at the same slope as the sloped portion of the right side surface 54 . The right leg 33 is connected to the right truck frame 3, and the lower surface 55 is located at a higher position than the lower surface of the truck frame 3.

The front connecting member 4F has a reinforcing portion 61. The reinforcing portion 61 is provided on the rear side of the connecting member 4F, and has a triangular plate shape that straddles the connecting member 4F and the pipe material 11 (hereinafter referred to as "right pipe material 11R") passing near the brackets 13 and 14. is formed. As a result, the reinforcing portion 61 has a slope 62 located upward toward the rear. The shape of the reinforcing portion 61 is set so that the slope 62 extends along a straight line passing near the bracket 13 for supporting the engine and near the frontmost rolling wheel shaft 22.

The rear connecting member 4R has reinforcing portions 63 and 64. The reinforcing portion 63 is provided on the front side of the connecting member 4R, and is formed in a triangular plate shape spanning the connecting member 4R and the right pipe material 11R. The reinforcing portion 64 is made of a pipe material having a square cross section, and is provided on the rear side of the connecting member 4R, and extends over the upper end portion of the leg portion 33 of the connecting member 4R and the right pipe material 11R. The reinforcing portion 64 has a slope 65 on the lower surface that is positioned upward toward the rear, and the slope 65 connects to the vicinity of the bracket 14 for supporting the grain tank and the upper end of the leg portion 33 of the connecting member 4R. It is set to extend along a straight line passing through. As a result, the slope 65 and the rear side surface 52 of the leg portion 33 form a surface that connects from the vicinity of the bracket 14 to the vicinity of the rearmost wheel shaft 22.

<Effect>
As described above, in the structure of the fuselage frame 1, the main frame 2 to which heavy objects such as the engine and grain tank are assembled is provided above the track frame 3 to which the crawler traveling device is assembled, and is connected to the connecting members 4F and 4R. It is connected to the truck frame 3. The main frame 2 is provided with a bracket 13 for supporting the engine and a bracket 14 for supporting the grain tank. The track frame 3 is provided with a wheel shaft 22 that supports the wheels of the crawler traveling device. Since the connecting members 4F and 4R have the reinforcing portions 61 and 64, the stress generated in the brackets 13 and 14 due to the inertia of the engine and grain tank is transmitted to the wheel shaft 22 when the working vehicle is traveling or turning. This increases the rigidity of the frame structure against the stress generated in the brackets 13 and 14, so that it is possible to reduce the weight of the connecting members 4F and 4R while ensuring the necessary rigidity.

The reinforcing portion 61 has a slope 62, and the shape of the reinforcing portion 61 is such that the slope 62 extends along a straight line passing near the bracket 13 for supporting the engine and near the frontmost wheel shaft 22. is set. As a result, the stress generated in the bracket 13 propagates along the slope 62 to the connecting member 4F, and the stress propagates within the connecting member 4F in the same direction as the slope 62 toward the forwardmost wheel shaft 22. Therefore, the stress generated in the bracket 13 is transmitted linearly to the wheel shaft 22. Thereby, the stress generated in the bracket 13 can be transmitted well to the wheel shaft 22, and the rigidity of the frame structure against the stress generated in the bracket 13 can be further improved.

The reinforcing portion 64 has a slope 65 on the lower surface that is located higher toward the rear, and the slope 65 and the rear side surface 52 of the leg portion 33 connect the vicinity of the bracket 14 to the vicinity of the wheel shaft 22 located at the rearmost position. A surface is formed. As a result, the stress generated in the bracket 14 is transmitted to the vicinity of the rolling wheel shaft 22 by propagating through a surface connected from the vicinity of the bracket 14 to the vicinity of the rolling wheel shaft 22. Thereby, the stress generated in the bracket 14 can be transmitted to the wheel shaft 22 in a good manner.

The connecting members 4F, 4R have a connecting portion 31 extending in the left-right direction, and leg portions 32, 33 extending from the connecting portion 31 toward the left and right truck frames 3, respectively, and are located at a position higher than the lower end of the truck frame 3. , the lower ends of the legs 32 and 33 are connected to the truck frame 3. In this configuration, the lengths of the legs 32, 33 are the same between these configurations, compared to a configuration in which the lower ends of the legs 32, 33 are located at the same height as the lower end of the truck frame 3. Also, since the height of the connecting portion 31 is raised, the mud removal performance (mud protection performance) is improved.

<Second embodiment>
FIG. 5 is a perspective view of a fuselage frame 101 of a combine harvester according to a second embodiment of the present invention, viewed from the front right side. FIG. 6 is a diagram of the fuselage frame 101 seen from the right side (right side view). FIG. 7 is a diagram of the fuselage frame 101 seen from the front side (front view). FIG. 8 is a diagram of the body frame 101 seen from the rear side (rear view).

In the fuselage frame 101, a front connecting member 102 is different from the front connecting member 4F of the fuselage frame 1 according to the first embodiment. The other configurations are common between the fuselage frame 1 and the fuselage frame 101, so the explanation of the common configurations will be omitted below, and in FIGS. 5 to 8, the parts shown in FIGS. The same reference numerals as those parts are given to the parts having the same structure as the parts shown in the figure.

The connecting member 102 has an intermediate portion 103, upper connecting portions 104L, 104R, and lower connecting portions 105L, 105R. The intermediate portion 103, the upper connecting portions 104L, 104R, and the lower connecting portions 105L, 105R are all made of pipe material having a square cross section.

The intermediate portion 103 extends in the left-right direction with approximately the same length as the distance between the left and right track frames 3.

The upper connecting portion 104L is provided at the same position in the left-right direction as the right pipe material 11R of the main frame 2, and connects the right pipe material 11R and the intermediate portion 103. The upper connecting portion 104R is provided at the same position in the left-right direction as the pipe material 11 (hereinafter referred to as "left pipe material 11L") arranged on the left side of the right pipe material 11R of the main frame 2, and 11L and the intermediate portion 103 are connected.

The lower connecting portion 105L connects the left end of the intermediate portion 103 and the left truck frame 3, and the lower surface of the lower connecting portion 105L is connected to the upper surface of the pipe material 24 on the lower side of the truck frame 3. has been done. The lower connecting portion 105R connects the right end of the intermediate portion 103 and the left truck frame 3, and the lower surface of the lower connecting portion 105R is connected to the upper surface of the pipe material 24 on the lower side of the truck frame 3. has been done. Therefore, each lower surface of the lower connecting portions 105L, 105R is located at a higher position than the lower surface of the truck frame 3.

Further, the connecting member 102 has reinforcing portions 111L, 111R, 112L, 112R, 113L, and 113R.

The reinforcing portion 111L is provided on the rear side of the intermediate portion 103, and extends over the intermediate portion 103 and the left pipe material 11, and is inclined so as to be positioned upward toward the rear. The reinforcing portion 111R is provided on the rear side of the intermediate portion 103, and extends over the intermediate portion 103 and the right pipe material 11 in order to support the engine from the intermediate portion 103 so as to be positioned higher toward the rear. It is inclined toward the vicinity of the bracket 13.

The reinforcing part 112L is provided on the front side of the intermediate part 103, and extends over the left end of the intermediate part 103 and the left track frame 3, so that the reinforcing part 112L is located lower toward the front. It extends toward the wheel set 22. The reinforcing part 112R is provided on the front side of the intermediate part 103, and extends over the left end of the intermediate part 103 and the right track frame 3, so that the reinforcing part 112R is positioned lower toward the front. It extends toward the wheel set 22.

The reinforcing portion 113L straddles the intermediate portion 103 and the lower end portion of the left lower connecting portion 105L, and is inclined so as to be located lower toward the left side. The reinforcing portion 113R extends across the intermediate portion 103 and the lower end of the right lower connecting portion 105R, and is inclined so as to be located lower toward the left side.

<Effect>
In this frame structure, the stress generated in the bracket 13 propagates in order through the reinforcing portion 111R, the intermediate portion 103, and the reinforcing portion 112R, and is transmitted to the frontmost wheel shaft 22. This increases the rigidity of the frame structure against the stress generated in the bracket 13, so that the weight of the connecting member 102 can be reduced while ensuring the necessary rigidity.

Furthermore, since the lower surfaces of the lower connecting portions 105L and 105R are located at a higher position than the lower surface of the truck frame 3, the lower surfaces of the lower connecting portions 105L and 105R are at the same height as the lower end of the truck frame 3. Even if the lengths of the lower connecting portions 105L and 105R are the same between these configurations, the height position of the intermediate portion 103 is increased, so mud removal performance (mud protection performance) is improved. .

<Modified example>
Although the embodiments of the present invention have been described above, the present invention can also be implemented in other forms.

For example, although a combine harvester has been taken up as an example of a working vehicle, the present invention also includes a harvester and a seedling planting device that are equipped with a harvesting and transporting device as a working device for harvesting and transporting vegetables such as carrots, radish, edamame, and cabbage. It can be applied to various working vehicles, such as a rice transplanter equipped as a working device, a direct sowing machine equipped with a sowing device as a working device, a tractor equipped with a plow as a working device, and a construction work vehicle equipped with a bucket as a working device.

In addition, various design changes can be made to the above-described configuration within the scope of the claims.

1: Airframe frame (frame structure)
2: Main frame 3: Truck frame 4F, 4R: Connection member 13, 14: Bracket (support part)
22: Wheel shaft 31: Connecting portion 32, 33: Leg portion 61, 64, 111R, 112R: Reinforcement portion 102: Connecting member 103: Intermediate portion (connecting portion)
105L, 105R: Lower connection part (leg part)

Claims (7)

A frame structure of a work vehicle,
a main frame to which a heavy object is assembled and supports the heavy object at a support portion;
a truck frame to which a traveling device is assembled, and in which wheel axles that respectively support a plurality of rolling wheels of the traveling device are arranged in alignment in the front-rear direction ;
a front connecting member that connects the main frame and the truck frame and supports the main frame above the truck frame;
a rear connecting member provided on the rear side of the front connecting member, connecting the main frame and the truck frame, and supporting the main frame above the truck frame;
The front connecting member and the rear connecting member have reinforcing portions configured so that stress generated in the support portion is transmitted to the wheel shaft,
The support portion is provided at a relatively front position and a relatively rear position,
The reinforcing portion of the front connecting member is set so that the stress generated in the front support portion is transmitted linearly to the frontmost wheel shaft,
In the frame structure, the reinforcing portion of the rear connecting member is configured so that stress generated in the rear support portion is transmitted to the wheel shaft located at the rearmost position. The frame structure according to claim 1, wherein the reinforcing portion of the front connecting member has a surface along a straight line passing through the vicinity of the support portion on the front side and the vicinity of the wheel shaft located at the frontmost position . The reinforcing portion of the rear connecting member is configured to form a surface that connects from the vicinity of the support portion on the rear side to the vicinity of the wheel shaft located at the rearmost position. frame structure. The connecting member has a connecting portion extending in the left-right direction, and leg portions extending from the connecting portion toward the left and right truck frames,
The frame structure according to any one of claims 1 to 3 , wherein the lower end of the leg is connected to the truck frame at a position higher than the lower end of the truck frame. The frame structure according to claim 4, wherein the leg portion is connected to the truck frame from the inside in the left-right direction. The frame structure according to any one of claims 1 to 5, wherein the front connecting member and the rear connecting member have the same configuration. The work vehicle is equipped with an engine and a harvest tank that stores crops harvested during harvesting work,
The support portion on the front side supports the engine,
Frame structure according to any one of claims 1 to 6, wherein the support section on the rear side supports the crop tank.

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