JP2015093514A - Carrier in forest - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carrier in forest of respective left-right four wheels capable of making a sufficiently small turn even on a forestry road abd woodland of a narrow road width, and also securing travel stability even when encountering slope land.SOLUTION: The carrier in forest is respectively provided with four wheels 5 on the left and right of a vehicle body frame 1, and among the four wheels, intermediate two wheels are used as a grounding wheel 5A, and each outside one wheel is installed in the vehicle body frame 1 as a floating wheel 5B, and the respective four wheels are rotated by meshing between a pinion fixed to a rotary shaft rotatingly driven by a chain power transmission device with a hydraulic motor 6 as a power source and a ring gear fixed to the respective wheels.

Description

  The present invention relates to a wheel-type forest carriage used for carrying wood in a forest, and more particularly to a forest carriage having four wheels on each of the left and right sides of a vehicle body.

  As a transport vehicle for carrying out wood, it is recommended to use a wood transport vehicle having four wheels on each of the left and right sides of the vehicle body. This is because all the wheels (eight wheels in total) of the transporting vehicle are in contact with the ground, so that the ground contact area is increased, thereby ensuring the stability of the vehicle in the transporting state of the wood. On the other hand, however, the turning or turning of the vehicle clockwise or counterclockwise on the road has to be a large turn no matter how large the difference between the rotation speeds of the left and right wheels.

  Since the work roads in the forest are generally narrow and undeveloped, there has been a strong demand for the appearance of relatively small timber transport vehicles that can be turned around.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a left and right four-wheel forest transport vehicle that can sufficiently turn even on narrow roads and forest roads, and that ensures running stability even when it encounters sloping ground.

  This object of the present invention has four wheels on each of the left and right sides of the body frame, the middle two wheels among the four wheels are grounded wheels, and each outer wheel is mounted on the body frame as a floating wheel, A forest transport vehicle in which four wheels are rotated by meshing a pinion fixed to a rotary shaft that is rotationally driven by a chain power transmission device using a hydraulic motor as a power source and a ring gear fixed to each wheel. Is achieved by providing

  According to the present invention, a forest carriage includes a body frame, a cargo bed mounted on the body frame, a cab supported from the front end of the body frame, and a hydraulic system of a hydraulic motor mounted on the body frame. A chain power transmission device is disposed in the left and right chain boxes that form part of the body frame, and its rotating shaft having pinions is fixed to the side surface of the chain box and rotates to the bearing support. The ring gear fixed to each wheel, which is freely provided and meshed with the pinion, is rotatably mounted on the bearing support. For the wheel, the ring gear is positioned with respect to the pinion so as to be at a point angularly separated from the upper apex.

  According to the present invention, the pinion and the ring gear meshing with each other constitute a speed reducer for decelerating the rotation of the rotary shaft from the hydraulic motor via the chain power transmission device.

  According to the present invention, the wheel is made of a rubber tire having a wheel and a hub, and a steel crawler band may be put between two intermediate wheels so as to adapt to marshes and the like.

  According to the forest transportation vehicle according to the present invention, the middle two wheels among the four wheels mounted on the body frame are grounded wheels, and each outer wheel is a floating wheel. This is done with a grounded wheel, and when the vehicle is tilted forward or backward with respect to the ground due to uneven roads, sloping ground or loading, the floating wheel touches the ground, so that the vehicle can run stably, The turning or turning of the vehicle in the forest can be performed very easily because it is possible to make a small turn because there are only two intermediate wheels on the ground. A reduction gear is configured by meshing a pinion fixed to a rotating shaft that is rotationally driven by a chain power transmission device that uses a hydraulic motor as a power source and a ring gear that is fixed to each wheel and meshed with the wheel. Therefore, the structure of the wheel drive system including the hydraulic system of the hydraulic motor can be simplified.

1 is an overall side view of a forest truck according to the present invention. FIG. It is the front view. FIG. It is a side view which shows the modification of the forest transport vehicle by this invention. It is a plane sectional view showing a part of the rear one side of a forest transportation vehicle including a hydraulic motor, a chain power transmission device, a gear device and wheels of the forest transportation vehicle according to the present invention. It is side surface sectional drawing in the AA of FIG. 6 which shows a floating wheel. It is the back sectional view showing a grounding wheel.

  Referring to FIGS. 1-4, the entire forest truck according to the present invention is shown. The forest carriage includes a body frame 1, a loading platform 2 mounted on the body frame 1, a cab 3 supported from the front end of the body frame 1, and an engine (not shown) that drives a hydraulic pump of a hydraulic system. ) Including the engine compartment 4. The vehicle body frame 1 has four wheels 5 on the left and right sides, and the middle two wheels among the four wheels are grounded wheels 5A, and each outer wheel is mounted on the vehicle body frame 1 as a floating wheel 5B. A pair of hydraulic motors 6 and 6 associated with the hydraulic system are provided in the approximate center of the vehicle body frame 1 as indicated by dotted lines in FIG. 2, each of which functions as a power source for the left or right four wheels. It is like that.

  FIG. 6 shows only two rear wheels on one side of the body frame 1 and it should be understood that the two front wheels are omitted. Further, it should be understood that details on the other side of the vehicle body frame 1 are omitted from the description, but are substantially the same as those in FIG. As shown in detail in FIG. 6, each hydraulic motor 6 is fixedly attached to the inside of a chain box 7 forming a part of the vehicle body frame 1, and a chain power transmission device 9 including a pair of sprockets 8 on its output shaft is provided. It is provided in the chain box 7.

  The chain power transmission device 9 includes a rotating shaft 11 rotatably provided on a bearing support 10 fixedly attached to the outside of the chain box 7, a pair of sprockets 12 keyed thereto, and a rotating shaft. 11 includes a chain 13 spanned between the 11 sprockets 12 and 12 and a chain 14 spanned between the spcket 12 of the rotating shaft 11 and one of the sprockets 8 of the hydraulic motor 6. Similarly to the rear part of the vehicle body, the other sprocket 8 of the hydraulic motor 6 is stretched similarly to the sprocket of the rotating shaft at the front part of the vehicle body. Thus, the rotation of each hydraulic pump 6 hydraulically driven through a hydraulic system (not shown) including a hydraulic pump driven by the engine is transmitted to each rotary shaft 11 via the chain power transmission device 9. .

  As shown in FIGS. 6 to 8, a pinion 15 is fixedly attached to the tip of each rotating shaft 11. Each wheel 5 of the vehicle according to the present invention comprises a rubber tire including a wheel 15 and a hub 16. In another embodiment shown in FIG. 5, the ground contact area of the middle two wheels is increased, and when the transport vehicle is thrown into a marsh or the like, the ground wheel is prevented from sinking or sinking into the marsh. As shown, the middle two wheels 5 may be used with a steel crawler band 18 between them.

  The ring gear 17 is rotatably provided on the bearing support 10 in mesh with the pinion 15, and each wheel has its hub 16 fixed to the ring gear 17 as clearly shown in FIGS. 6 and 8. The rotation of the pinion 15 is transmitted to the ring gear 17 engaged therewith, and each wheel 5 is rotated together with the ring gear 17 by the ring gear 17.

  As described above, the left and right intermediate two wheels of the vehicle body frame 1 are set as ground wheels, and one wheel on each side of the wheels 5 is set as a floating wheel. As apparent from FIGS. 6 and 8, such setting of the grounding wheel is performed by the ring gear 17 being shifted downward with respect to the pinion 15 and the ring gear 17 meshing with the pinion 11 at the upper vertex thereof. Therefore, the bearing support 10 is designed in such a form as to support the ring gear 17 rotatably at such a position. As is apparent from FIGS. 6 to 7, the floating wheel is set at a point where the ring gear 17 is separated from the upper apex by a desired angle, for example, 90 °, that is, shifted upward with respect to the pinion rotation shaft 11 and the rotation shaft. 11 is engaged by engaging with the pinion 15 at a point shifted in the horizontal direction from the axis of the shaft 11, and therefore the bearing support 10 is designed to support the ring gear 17 so as to be rotatable at such a position. The It is desirable that both such bearing supports 10 for the ground wheel and the floating wheel are designed in the same form and can be turned 90 ° to meet the above purpose of use.

  According to the forest transportation vehicle of the present invention, the rotating shaft 11 is rotationally driven by the chain power transmission device 9 using the hydraulic motor 6 as a power source, and the rotation is caused by the pinion 15 and the ring gear 17 associated with each wheel 5. Is transmitted to the wheel 5 at a decelerating rotational speed by a speed reduction mechanism configured by meshing the gears, and the wheel 5 is rotated. It will be readily appreciated by those skilled in the art that under the control of the hydraulic pump, the hydraulic motor provides a rotational output at the desired rotational speed or rotational speed required of the wheels. When turning or turning a vehicle on a forest road or in a forest, it is performed by controlling the hydraulic pumps associated with the left and right hydraulic motors due to the difference in the rotational output of the hydraulic motors and the difference in the number of rotations of the left and right wheels. In this case, since only two intermediate wheels are in contact with the ground, it can be performed very easily by a small turn. Normal driving of the vehicle is performed with an intermediate grounding wheel, but if the vehicle tilts forward or backward with respect to the ground due to uneven roads, sloping ground or loading, the floating wheel also touches the ground, so that the vehicle is stable. Can drive.

DESCRIPTION OF SYMBOLS 1 Body frame 2 Loading platform 3 Driver's cab 4 Engine room 5 Wheel 5A Ground wheel 5B Floating wheel 6 Pair of hydraulic motors 7 Chain box 9 Chain power transmission device 11 Rotating shaft 15 Pinion 17 Ring gear 18 Steel crawler band 18

  The present invention relates to a wheel-type forest carriage used for carrying wood in a forest, and more particularly to a forest carriage having four wheels on each of the left and right sides of a vehicle body.

  As a transport vehicle for carrying out wood, it is recommended to use a wood transport vehicle having four wheels on each of the left and right sides of the vehicle body. This is because all the wheels of the transport vehicle (eight wheels in total) are in contact with the ground, so that the ground contact area becomes large, thereby ensuring the stability of the vehicle in the state of transporting wood (for example, patents). Document 1 (FIGS. 1 and 2, Patent Document 2 (described in FIG. 1 and FIG. 2, paragraph [0002]). However, on the road, the turning or turning of the vehicle clockwise or counterclockwise is as follows. No matter how large the difference in the number of rotations of the left and right wheels, there is no choice but to make a large turn.

JP 2010-285101A JP 2011-31687

  Since the work roads in the forest are generally narrow and undeveloped, there has been a strong demand for the appearance of relatively small timber transport vehicles that can be turned around.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a left and right four-wheel forest transport vehicle that can sufficiently turn even on narrow roads and forest roads, and that ensures running stability even when it encounters sloping ground.

  This object of the present invention has four wheels on each of the left and right sides of the body frame, the middle two wheels among the four wheels are grounded wheels, and each outer wheel is mounted on the body frame as a floating wheel, A forest transport vehicle in which four wheels are rotated by meshing a pinion fixed to a rotary shaft that is rotationally driven by a chain power transmission device using a hydraulic motor as a power source and a ring gear fixed to each wheel. Is achieved by providing

  According to the present invention, a forest carriage includes a body frame, a cargo bed mounted on the body frame, a cab supported from the front end of the body frame, and a hydraulic system of a hydraulic motor mounted on the body frame. A chain power transmission device is disposed in the left and right chain boxes that form part of the body frame, and its rotating shaft having pinions is fixed to the side surface of the chain box and rotates to the bearing support. The ring gear fixed to each wheel, which is freely provided and meshed with the pinion, is rotatably mounted on the bearing support. For the wheel, the ring gear is positioned with respect to the pinion so as to be at a point angularly separated from the upper apex.

  According to the present invention, the pinion and the ring gear meshing with each other constitute a speed reducer for decelerating the rotation of the rotary shaft from the hydraulic motor via the chain power transmission device.

  According to the present invention, the wheel is made of a rubber tire having a wheel and a hub, and a steel crawler band may be put between two intermediate wheels so as to adapt to marshes and the like.

  According to the forest transportation vehicle according to the present invention, the middle two wheels among the four wheels mounted on the body frame are grounded wheels, and each outer wheel is a floating wheel. This is done with a grounded wheel, and when the vehicle is tilted forward or backward with respect to the ground due to uneven roads, sloping ground or loading, the floating wheel touches the ground, so that the vehicle can run stably, The turning or turning of the vehicle in the forest can be performed very easily because it is possible to make a small turn because there are only two intermediate wheels on the ground. A reduction gear is configured by meshing a pinion fixed to a rotating shaft that is rotationally driven by a chain power transmission device that uses a hydraulic motor as a power source and a ring gear that is fixed to each wheel and meshed with the wheel. Therefore, the structure of the wheel drive system including the hydraulic system of the hydraulic motor can be simplified.

1 is an overall side view of a forest truck according to the present invention. FIG. It is the front view. FIG. It is a side view which shows the modification of the forest transport vehicle by this invention. It is a plane sectional view showing a part of the rear one side of a forest transportation vehicle including a hydraulic motor, a chain power transmission device, a gear device and wheels of the forest transportation vehicle according to the present invention. It is side surface sectional drawing in the AA of FIG. 6 which shows a floating wheel. It is the back sectional view showing a grounding wheel.

  Referring to FIGS. 1-4, the entire forest truck according to the present invention is shown. The forest carriage includes a body frame 1, a loading platform 2 mounted on the body frame 1, a cab 3 supported from the front end of the body frame 1, and an engine (not shown) that drives a hydraulic pump of a hydraulic system. ) Including the engine compartment 4. The vehicle body frame 1 has four wheels 5 on the left and right sides, and the middle two wheels among the four wheels are grounded wheels 5A, and each outer wheel is mounted on the vehicle body frame 1 as a floating wheel 5B. A pair of hydraulic motors 6 and 6 associated with the hydraulic system are provided in the approximate center of the vehicle body frame 1 as indicated by dotted lines in FIG. 2, each of which functions as a power source for the left or right four wheels. It is like that.

  FIG. 6 shows only two rear wheels on one side of the body frame 1 and it should be understood that the two front wheels are omitted. Further, it should be understood that details on the other side of the vehicle body frame 1 are omitted from the description, but are substantially the same as those in FIG. As shown in detail in FIG. 6, each hydraulic motor 6 is fixedly attached to the inside of a chain box 7 forming a part of the vehicle body frame 1, and a chain power transmission device 9 including a pair of sprockets 8 on its output shaft is provided. It is provided in the chain box 7.

  The chain power transmission device 9 includes a rotating shaft 11 rotatably provided on a bearing support 10 fixedly attached to the outside of the chain box 7, a pair of sprockets 12 keyed thereto, and a rotating shaft. 11 includes a chain 13 spanned between the 11 sprockets 12 and 12 and a chain 14 spanned between the spcket 12 of the rotating shaft 11 and one of the sprockets 8 of the hydraulic motor 6. Similarly to the rear part of the vehicle body, the other sprocket 8 of the hydraulic motor 6 is stretched similarly to the sprocket of the rotating shaft at the front part of the vehicle body. Thus, the rotation of each hydraulic pump 6 hydraulically driven through a hydraulic system (not shown) including a hydraulic pump driven by the engine is transmitted to each rotary shaft 11 via the chain power transmission device 9. .

  As shown in FIGS. 6 to 8, a pinion 15 is fixedly attached to the tip of each rotating shaft 11. Each wheel 5 of the vehicle according to the present invention comprises a rubber tire including a wheel 15 and a hub 16. In another embodiment shown in FIG. 5, the ground contact area of the middle two wheels is increased, and when the transport vehicle is thrown into a marsh or the like, the ground wheel is prevented from sinking or sinking into the marsh. As shown, the middle two wheels 5 may be used with a steel crawler band 18 between them.

  The ring gear 17 is rotatably provided on the bearing support 10 in mesh with the pinion 15, and each wheel has its hub 16 fixed to the ring gear 17 as clearly shown in FIGS. 6 and 8. The rotation of the pinion 15 is transmitted to the ring gear 17 engaged therewith, and each wheel 5 is rotated together with the ring gear 17 by the ring gear 17.

  As described above, the left and right intermediate two wheels of the vehicle body frame 1 are set as ground wheels, and one wheel on each side of the wheels 5 is set as a floating wheel. As apparent from FIGS. 6 and 8, such setting of the grounding wheel is performed by the ring gear 17 being shifted downward with respect to the pinion 15 and the ring gear 17 meshing with the pinion 11 at the upper vertex thereof. Therefore, the bearing support 10 is designed in such a form as to support the ring gear 17 rotatably at such a position. As is apparent from FIGS. 6 to 7, the floating wheel is set at a point where the ring gear 17 is separated from the upper apex by a desired angle, for example, 90 °, that is, shifted upward with respect to the pinion rotation shaft 11 and the rotation shaft. 11 is engaged by engaging with the pinion 15 at a point shifted in the horizontal direction from the axis of the shaft 11, and therefore the bearing support 10 is designed to support the ring gear 17 so as to be rotatable at such a position. The It is desirable that both such bearing supports 10 for the ground wheel and the floating wheel are designed in the same form and can be turned 90 ° to meet the above purpose of use.

  According to the forest transportation vehicle of the present invention, the rotating shaft 11 is rotationally driven by the chain power transmission device 9 using the hydraulic motor 6 as a power source, and the rotation is caused by the pinion 15 and the ring gear 17 associated with each wheel 5. Is transmitted to the wheel 5 at a decelerating rotational speed by a speed reduction mechanism configured by meshing the gears, and the wheel 5 is rotated. It will be readily appreciated by those skilled in the art that under the control of the hydraulic pump, the hydraulic motor provides a rotational output at the desired rotational speed or rotational speed required of the wheels. When turning or turning a vehicle on a forest road or in a forest, it is performed by controlling the hydraulic pumps associated with the left and right hydraulic motors due to the difference in the rotational output of the hydraulic motors and the difference in the number of rotations of the left and right wheels. In this case, since only two intermediate wheels are in contact with the ground, it can be performed very easily by a small turn. Normal driving of the vehicle is performed with an intermediate grounding wheel, but if the vehicle tilts forward or backward with respect to the ground due to uneven roads, sloping ground or loading, the floating wheel also touches the ground, so that the vehicle is stable. Can drive.

DESCRIPTION OF SYMBOLS 1 Body frame 2 Loading platform 3 Driver's cab 4 Engine room 5 Wheel 5A Ground wheel 5B Floating wheel 6 Pair of hydraulic motors 7 Chain box 9 Chain power transmission device 11 Rotating shaft 15 Pinion 17 Ring gear 18 Steel crawler band 18

  The present invention relates to a wheel-type forest carriage used for carrying wood in a forest, and more particularly to a forest carriage having four wheels on each of the left and right sides of a vehicle body.

As a transport vehicle for carrying out wood, it is recommended to use a wood transport vehicle having four wheels on each of the left and right sides of the vehicle body. This is because all the wheels (eight wheels in total) of the transport vehicle are in contact with the ground, so that the ground contact area is increased, thereby ensuring the stability of the vehicle in the wood judgment state. (For example, Patent Document 1 (FIGS. 1 and 2), Patent Document 2 (FIGS. 1 and 2, paragraph [0002])). On the other hand, however, the turning or turning of the vehicle on the road, such as clockwise or counterclockwise, has to be large no matter how large the difference in the number of rotations of the left and right wheels. In order to solve such a problem, a vehicle has been proposed in which left and right wheels at both front and rear ends are floating wheels and intermediate left and right wheels are always grounded (cited document 3). However, this proposal only discloses the principle, and does not disclose any drive systems for floating wheels and ground wheels.

JP 2010-285101A JP 2011-31687 Shokai Sho 58-50082

The object of the present invention is to make a sufficiently small turn even on a forest road or a forest with a narrow road width, and to ensure running stability even when encountering an inclined land, and to facilitate the setting of a ground wheel and a floating wheel for that purpose. It is to provide a forest carriage with four wheels on each side.

The object of the present invention is to have four wheels on each of the left and right sides of the vehicle body frame, and the middle two wheels of the four wheels are always grounded wheels that are in contact with the ground, and each outer wheel is floated from the ground on a flat ground. In a forest transport vehicle mounted on a body frame as a floating wheel, a rotary shaft that is disposed in the left and right chain boxes that form part of the body frame and is driven to rotate by a chain power transmission device that uses a hydraulic motor as a power source Four wheels are rotated by meshing with a pinion fixed to each wheel and a ring gear fixed to each wheel, and the ring gear meshed with the pinion rotates on a bearing support fixed to the side surface of the chain box. Mounted freely, the meshing point of the pinion and ring gear is at the top of the ring gear for grounded wheels, and for floating wheels Said ring gear to a point spaced angularly from the upper apex formed by positioning relative to the pinion, is achieved by providing a forest truck.

  According to the present invention, the wheel is made of a rubber tire having a wheel and a hub, and a steel crawler band may be put between two intermediate wheels so as to adapt to marshes and the like.

According to the forest truck according to the present invention, the middle two wheels among the four wheels mounted on the body frame are always grounded wheels that are in contact with the ground, and each outer wheel is floated from the ground on a flat ground. Because of the wheel, the vehicle's normal running is performed with an intermediate ground wheel, and if the vehicle tilts forward or backward with respect to the ground due to bumpy roads, sloping ground or loading, the floating wheel touches the ground, so the vehicle The vehicle can be driven stably, and the turning or turning of the vehicle on the forest road or in the forest can be performed very easily because only two intermediate wheels are in contact with the ground. Ground wheels and lifting the wheel, as will be rotated and a pinion fixed to a rotary shaft driven to rotate by chain power transmission device for a hydraulic motor powered by engagement of the ring gear fixed to each wheel Since it is configured, the structure of the wheel drive system including the hydraulic system of the hydraulic motor can be simplified. Moreover, the setting as a grounding wheel and a floating wheel can be easily performed by changing the meshing position of the ring gear with respect to the pinion and using a bearing support suitable for it.

1 is an overall side view of a forest truck according to the present invention. FIG. It is the front view. FIG. It is a side view which shows the modification of the forest transport vehicle by this invention. It is a plane sectional view showing a part of the rear one side of a forest transportation vehicle including a hydraulic motor, a chain power transmission device, a gear device and wheels of the forest transportation vehicle according to the present invention. It is side surface sectional drawing in the AA of FIG. 6 which shows a floating wheel. It is the back sectional view showing a grounding wheel.

Referring to FIGS. 1-4, the entire forest truck according to the present invention is shown. The forest carriage includes a body frame 1, a loading platform 2 mounted on the body frame 1, a cab 3 supported from the front end of the body frame 1, and an engine (not shown) that drives a hydraulic pump of a hydraulic system. ) Including the engine compartment 4. Have respective 4 wheels 5 on the left and right of the body frame 1, lifting the wheels 5B the 4 a ground wheel 5A that contacts the intermediate 2 wheels always ground of the wheels, the respective first wheel of the outer and floated from the ground in flat land It is attached to the body frame 1 as follows. A pair of hydraulic motors 6 and 6 associated with the hydraulic system are provided in the approximate center of the vehicle body frame 1 as indicated by dotted lines in FIG. 2, each of which functions as a power source for the left or right four wheels. It is like that.

  FIG. 6 shows only two rear wheels on one side of the body frame 1 and it should be understood that the two front wheels are omitted. Further, it should be understood that details on the other side of the vehicle body frame 1 are omitted from the description, but are substantially the same as those in FIG. As shown in detail in FIG. 6, each hydraulic motor 6 is fixedly attached to the inside of a chain box 7 forming a part of the vehicle body frame 1, and a chain power transmission device 9 including a pair of sprockets 8 on its output shaft is provided. It is provided in the chain box 7.

The chain power transmission device 9 includes a rotating shaft 11 rotatably provided on a bearing support 10 fixedly attached to the outside of the chain box 7, a pair of sprockets 12 keyed thereto, and a rotating shaft. 11 includes a chain 13 spanned between the 11 sprockets 12 and 12 and a chain 14 spanned between the spcket 12 of the rotating shaft 11 and one of the sprockets 8 of the hydraulic motor 6. Similarly to the rear part of the vehicle body, the other sprocket 8 of the hydraulic motor 6 is stretched similarly to the sprocket of the rotating shaft at the front part of the vehicle body. Thus, the rotation of each hydraulic motor 6 hydraulically driven through a hydraulic system (not shown) including a hydraulic pump driven by the engine is transmitted to each rotary shaft 11 via the chain power transmission device 9. .

As shown in FIGS. 6 to 8, a pinion 15 is fixedly attached to the tip of each rotating shaft 11. Each wheel 5 of the vehicle according to the present invention comprises a rubber tire including a wheel 20 and a hub 21 . In another embodiment shown in FIG. 5, the ground contact area of the middle two wheels is increased, and when the transport vehicle is thrown into a marsh or the like, the ground wheel is prevented from sinking or sinking into the marsh. As shown, the middle two wheels 5 may be used with a steel crawler band 18 between them.

The ring gear 17 is rotatably provided on the bearing support 10 in mesh with the pinion 15, and each wheel has its hub 21 fixed to the ring gear 17 as clearly shown in FIGS. 6 and 8. The rotation of the pinion 15 is transmitted to the ring gear 17 engaged therewith, and each wheel 5 is rotated together with the ring gear 17 by the ring gear 17.

As described above, the left and right intermediate two wheels of the vehicle body frame 1 are set as ground wheels, and one wheel on each side of the wheels 5 is set as a floating wheel. As apparent from FIGS. 6 and 8, such setting of the grounding wheel is performed by the ring gear 17 being shifted downward with respect to the pinion 15 and the ring gear 17 meshing with the pinion 15 at the upper vertex thereof. Therefore, the bearing support 10 is designed in such a form as to support the ring gear 17 rotatably at such a position. As apparent from FIGS . 6 and 7, the setting of the floating wheel is such that the ring gear 17 is shifted from the upper apex by a desired angle, for example, 90 °, that is, shifted upward with respect to the pinion rotation shaft 11 and the rotation shaft. 11 is engaged by engaging with the pinion 15 at a point shifted in the horizontal direction from the axis of the shaft 11, and therefore the bearing support 10 is designed to support the ring gear 17 so as to be rotatable at such a position. The It is desirable that both such bearing supports 10 for the ground wheel and the floating wheel are designed in the same form and can be turned 90 ° to meet the above purpose of use.

  According to the forest transportation vehicle of the present invention, the rotating shaft 11 is rotationally driven by the chain power transmission device 9 using the hydraulic motor 6 as a power source, and the rotation is caused by the pinion 15 and the ring gear 17 associated with each wheel 5. Is transmitted to the wheel 5 at a decelerating rotational speed by a speed reduction mechanism configured by meshing the gears, and the wheel 5 is rotated. It will be readily appreciated by those skilled in the art that under the control of the hydraulic pump, the hydraulic motor provides a rotational output at the desired rotational speed or rotational speed required of the wheels. When turning or turning a vehicle on a forest road or in a forest, it is performed by controlling the hydraulic pumps associated with the left and right hydraulic motors due to the difference in the rotational output of the hydraulic motors and the difference in the number of rotations of the left and right wheels. In this case, since only two intermediate wheels are in contact with the ground, it can be performed very easily by a small turn. Normal driving of the vehicle is performed with an intermediate grounding wheel, but if the vehicle tilts forward or backward with respect to the ground due to uneven roads, sloping ground or loading, the floating wheel also touches the ground, so that the vehicle is stable. Can drive.

DESCRIPTION OF SYMBOLS 1 Body frame 2 Loading platform 3 Driver's cab 4 Engine room 5 Wheel 5A Ground wheel 5B Floating wheel 6 Pair of hydraulic motors 7 Chain box 9 Chain power transmission device 11 Rotating shaft 15 Pinion 17 Ring gear 18 Steel crawler band 18

Claims (5)

  There are 4 wheels on each of the left and right sides of the body frame. The middle 2 wheels of the 4 wheels are grounded wheels, and each outer wheel is mounted on the body frame as a floating wheel. A forest transportation vehicle that provides a forest transportation vehicle that is rotated by meshing a pinion fixed to a rotating shaft that is rotationally driven by a chain power transmission device as a power source and a ring gear fixed to each wheel.   The forest carriage includes a body frame, a loading platform mounted on the body frame, a cab supported from the front end of the body frame, and an engine that drives a hydraulic system of a hydraulic motor mounted on the body frame. The chain power transmission device is disposed in the left and right chain boxes forming a part of the vehicle body frame, and its rotation shaft having a pinion is rotatably provided on a bearing support fixed to the side surface of the chain box, The ring gear meshed with the pinion and fixed to each wheel is rotatably mounted on the bearing support, and the meshing point of the pinion and the ring gear is the upper vertex of the ring gear for the ground wheel, and The forest carriage according to claim 1, wherein the ring gear is positioned with respect to the pinion so as to be angularly separated from the upper vertex.   The forestry vehicle according to claim 1 or 2, wherein the pinion and the ring gear meshing with each other constitute a speed reducer for decelerating the rotation of the rotating shaft from the hydraulic motor through the chain power transmission device.   The forest carriage according to any one of claims 1 to 3, wherein the wheel is made of a rubber tire having a wheel and a hub.   The forest carriage according to any one of claims 1 to 4, wherein a steel crawler band is put between two intermediate wheels.

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