JP4614292B1 - Truck and loading platform slide tilt device for truck - Google Patents

Abstract

The present invention provides a loading platform slide tilting apparatus suitable for a truck having a loading platform length of 3300 mm or less and a truck equipped with the loading platform slide tilting apparatus.
In a truck on which a loading platform slide tilting device 5 is mounted, a plurality of rack gears 29 are fixed to the lower surface of the loading platform at intervals in the vehicle width direction. Each rack gear 29 extends over substantially the entire length of the loading platform in the front-rear direction. A pinion gear 30 is engaged with each rack gear 29. The pinion gear 30 is connected to a rear end portion of the chassis 2 by a rotation shaft 21 that is rotatably provided. A sprocket 22 is attached to the rotating shaft 21, and a chain 25 is wound between the sprocket 22 and a pulley 24 attached to the output shaft of the electric motor 23.
[Selection] Figure 3

Description

  The present invention relates to a truck having a cargo bed length of 3300 mm or less and a cargo bed slide tilting apparatus for the truck, and more particularly to a light vehicle standard truck (light truck) and a cargo bed slide tilting apparatus suitable for the light truck.

  Light trucks and small trucks with a maximum loading capacity of 1000 kg or less (hereinafter simply referred to as “small trucks”) are widely used for transporting agricultural machines such as rice transplanters.

  In light trucks and light trucks, the loading platform is fixed to the chassis (frame). Therefore, loading and unloading of the agricultural machine onto the loading platform is performed by constructing a walking board between the rear end of the loading platform and the ground and moving the agricultural machine on the walking board.

  The longer the step board, the smaller the inclination angle of the step board when the step board is installed between the loading platform and the ground, and the agricultural machine can be loaded and unloaded safely and easily. On the other hand, as the length of the step board increases, the weight of the step board increases and handling of the step board becomes difficult. Therefore, a wooden board or metal having a length that can be handled easily to some extent while ensuring the minimum safety for loading and unloading the agricultural machine is used for the step board.

  However, it is not easy to handle the walking board, especially for older farmers. Moreover, the inclination angle of the step board laid between the loading platform and the ground is large, and loading and unloading of the agricultural machine is accompanied by a risk of the agricultural machine falling from the step board.

  Therefore, some large-scale farmers purchase carrier cars that can be transported by loading a small passenger car on a loading platform for transporting agricultural machines. The carrier car is equipped with a device (mechanism) for sliding the loading platform to the rear of the chassis to incline it. The loading platform slide tilting device includes, for example, a guide rail for guiding sliding of the loading platform and a hydraulic cylinder that is a power source for sliding the loading platform. The hydraulic cylinder has a main body swingably attached to the chassis, and a tip end of a rod is pivotally attached to a rear end of the loading platform. When the rod of the hydraulic cylinder is extended (advanced), the loading platform slides rearward along the guide rail and tilts so that the rear end portion thereof is lowered. Then, when the rod is in the most extended state, the rear end of the loading platform is brought into contact with the ground, and an object to be transported such as an agricultural machine can be loaded and unloaded on the loading platform.

  If such a carrier car is used for transporting an agricultural cultivator, the inclination angle of the pallet is about 30 ° or less when the pallet is lowered, and the cultivator can be safely and easily loaded onto the pallet.

  However, since the carrier bed length of the carrier car exceeds 4000 mm, a sufficient space is required behind the carrier car to lower the carrier board. Carrier cars have a wider vehicle width than light trucks and light trucks. However, there is not enough space on the farm road to unload the carrier car loading platform, or even there is no space to stop the carrier car with a large vehicle width, and the carrier car is not always suitable for transporting agricultural machines. Absent.

Japanese Patent Laid-Open No. 2000-6708

  Under such a background, the inventor of the present application diverts the loading platform slide tilting device mounted on the carrier car to a light truck or a small truck, and slides the loading platform of the light truck or the small truck to the rear of the chassis for tilting. However, it was found that the diversion is impossible for the following reasons 1 to 3.

  1. There is no hydraulic cylinder that has a stroke that can lower the platform of a light truck or a small truck with a small inclination angle of about 30 ° or less and that the total length is within the platform length (3300 mm or less).

  2. The loading platform slide tilting device including the hydraulic cylinder and the hydraulic pump is large, and light trucks do not have space to accommodate them. To ensure that space, the distance between the chassis and loading platform must be increased. There must be. As a result, even if the loading platform is raised and the loading platform is slid until its front end is positioned on the rear end of the chassis, the tilting angle of the loading platform becomes too large and the agricultural machine can be safely and easily attached to the loading platform. Can't be loaded or unloaded.

  3. A loading platform slide tilting device including a hydraulic cylinder includes a hydraulic pump and the like, and its weight is large. Therefore, if this is mounted on a light truck or the like, the maximum load is reduced and the practicality of the light truck or the like is significantly impaired.

  An object of the present invention is to provide a loading platform slide tilting apparatus suitable for a truck having a loading platform length of 3300 mm or less, particularly a light truck, and a truck equipped with the loading platform slide tilting apparatus.

In order to achieve the above object, a loading platform slide tilting apparatus according to the present invention is mounted on a truck having a platform length of 3300 mm or less, and slides the loading platform of the truck rearward with respect to the chassis of the truck. the end portion is grounded, a bed sliding tilt system for the state of inclining the loading platform is fixed at a distance from each other in the vehicle width direction in the chassis, 1 for guiding the loading platform of the slide A pair of guide rails, a rotation shaft extending in a vehicle width direction and rotatably provided at a rear end portion of the chassis, a sprocket attached to the rotation shaft, a motor held by the chassis, A pulley attached to the output shaft of the motor, a chain wound between the sprocket and the pulley, and a lower surface of the cargo bed are fixed at a distance from each other in the vehicle width direction. Includes a pair and rack gear that extends over the entire length of said loading platform in the longitudinal direction, respectively, mounted on the pivot shaft, and two pinion gears to the rack gear meshes.

In a truck on which the loading platform slide tilting device is mounted, a pair of rack gears are fixed to the lower surface of the loading platform at intervals in the vehicle width direction. Each rack gear extends over the entire length of the loading platform in the front-rear direction. A pinion gear meshes with each rack gear. The pinion gear is connected to a rear end portion of the chassis by a rotation shaft that is rotatably provided. A sprocket is attached to the rotating shaft, and a chain is wound between the sprocket and a pulley attached to the output shaft of the motor.

When the motor is driven to rotate in a predetermined direction, the driving force is transmitted to the rotating shaft via the pulley, chain, and sprocket, and the rotating shaft rotates. The rotation of the rotation shaft is transmitted to the rack gear through the pinion gear. As a result, the loading platform moves rearward together with the rack gear from the state stored on the chassis. The movement of the loading platform is guided by a pair of guide rails. By this guidance, the loading platform is moved rearward with respect to the chassis, and is inclined so that the front end thereof is lifted (so that the rear end is lowered). When the loading platform is slid to the end, the front end of the rack gear reaches the position where it engages with the pinion gear, the motor rotation is stopped, and the loading platform is tilted between the rear end of the chassis and the ground. (The front end portion of the cargo bed remains on the rear end portion of the chassis, and the rear end portion of the cargo bed is grounded).

In addition, after the object to be transported is unloaded from the loading platform, when the motor is driven to rotate in the direction opposite to the predetermined direction, the driving force is transmitted to the rack gear via the pulley, chain, sprocket, rotating shaft, and pinion gear. The cargo bed moves forward together with the rack gear. The movement of the loading platform is guided by a pair of guide rails. By this guidance, the loading platform is moved forward with respect to the chassis, and the front end portion thereof is inclined (so that the rear end portion is lifted). When the loading platform is slid to the foremost position, the rear end of the rack gear reaches a position where the rack gear meshes with the pinion gear, the motor is stopped, and the loading platform is returned to the state of being stored on the chassis.

  And since motors, pulleys, sprockets and chains can be placed between chassis and between guide rails, there is no need for a large space between the chassis and the loading platform, and modifications that are commercially available from manufacturers. There is no need to change the ground clearance of the loading platform from a normal truck that is not done.

  Accordingly, in a state where the loading platform is inclined and installed between the rear end portion of the chassis and the ground, the inclination angle of the loading platform with respect to the ground is about 30 ° or less. For example, in the case of a light truck, since the loading platform length is about 1900 mm and the ground height of the loading platform floor is about 650 mm, the loading platform is inclined between the rear end of the chassis and the ground. The inclination angle of the loading platform with respect to the ground is 30 ° or less (specifically, about 20 °). Therefore, it is possible to load and unload a transported object such as an agricultural machine safely and easily on the loading platform.

  This platform slide tilting device has a simple and lightweight construction that uses a motor as the drive source. Even if the platform slide tilting device is mounted on a light truck or a small truck with a maximum loading capacity of 1000 kg or less, the maximum loading capacity can be achieved. The utility of light trucks and small trucks is not impaired.

  The motor may be an electric motor or a hydraulic motor.

  The fact that the loading platform has been slid to the end may be detected by providing a limit switch at the rear end of the guide rail and a portion of the loading platform guided by the guide rail contacting the limit switch actuator.

  Further, the fact that the loading platform has been slid to the forefront may be detected by providing a limit switch at the front end portion of the guide rail and a portion of the loading platform guided by the guide rail contacting the limit switch actuator. .

  In this case, for example, when a notification lamp is provided in the inside of the truck and the portion guided by the guide rail of the loading platform is not in contact with the limit switch actuator, the notification lamp may be turned on. Good. Thereby, it is possible to make an operator (truck driver) recognize that the cargo bed is not stored, and it is possible to prevent the truck from traveling in a state where the cargo bed is not stored.

FIG. 1 is a side view of a truck on which a loading platform slide tilting apparatus according to an embodiment of the present invention is mounted, and shows a state where the loading platform is stored on a chassis. FIG. 2 is a side view of the same truck as the truck shown in FIG. 1 and shows a state where the loading platform is lowered from above the chassis. FIG. 3 is a rear view of the track shown in FIGS. FIG. 4 is a plan view of the loading platform slide tilting device shown in FIG. 1. FIG. 5 is a side view of the guide rail shown in FIG. 6 is a perspective view of the drive mechanism of the cargo bed slide tilting device shown in FIG.

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

  FIG. 1 is a side view of a truck on which a loading platform slide tilting apparatus according to an embodiment of the present invention is mounted, and shows a state where the loading platform is stored on a chassis. FIG. 2 is a side view of the same truck as the truck shown in FIG. 1 and shows a state where the loading platform is lowered from above the chassis. FIG. 3 is a rear view of the track shown in FIGS.

  The truck 1 is a light truck with a flat body. As shown in FIGS. 1 and 2, the chassis (frame) 2, the cabin 3 provided at the front end of the chassis 2, and the rear of the cabin 3 on the chassis 2. And a loading platform slide tilting device 5 provided between the chassis 2 and the loading platform 4. That is, the truck 1 is obtained by modifying a light truck that is generally available on the market and mounting the platform slide tilting device 5 between the chassis 2 and the platform 4.

  Side ledges 6 are provided at both side edges of the loading platform 4 in the vehicle width direction. Each side tilt 6 extends in the front-rear direction over the entire length of the loading platform 4, and a lower end edge thereof is connected to the loading platform 4 via a plurality of hinges 7. As a result, the side wings 6 stand upright with respect to the bottom plate of the loading platform 4 on the edge of the loading platform 4 in the vehicle width direction, and expand (rotate) outward from the state with the hinge 7 as a fulcrum. Thus, it can be displaced to a state of hanging downward on the outside of the loading platform 4. Further, a latch 8 is provided at the front end portion of each side tilt 6, and the side tilt 6 is raised when the latch 8 is locked to the front end portion of the loading platform 4 in a state where the side tilt 6 is raised. It is possible to hold the state that has been.

  As shown in FIG. 3, a rear tilt 9 is provided at the rear edge of the loading platform 4. The rear door 9 extends in the vehicle width direction over the entire width of the loading platform 4, and a lower end edge thereof is connected to the loading platform 4 via a plurality of hinges 10. As a result, the rear wing 9 stands vertically on the rear edge of the loading platform 4 with respect to the bottom plate of the loading platform 4, and from that state, the rear platform 9 is expanded (rotated) outwardly with the hinge 7 as a fulcrum. It can be displaced to a state where it hangs down to the outside lower side. The rear wing 9 is formed higher than the side wing 6 and is expanded (tilted) outward with the hinge 7 as a fulcrum in a state where the loading platform 4 is lowered to the rear of the chassis 2 and inclined as will be described later. In addition, it is constructed between the loading platform 4 and the ground, and has an upper surface whose upper surface extends substantially flush with the upper surface of the bottom plate of the loading platform 4. Further, latches 11 are provided at the upper end portions on both sides in the vehicle width direction of the rear tilt 9, and both latches 11 are locked to the rear upper end portions of the side tilt 6 in a state where the rear tilt 9 is raised. By doing so, it is possible to hold the state where the tilt is raised thereafter.

  Two grounding roller support members 12 are attached to the rear end portion of the lower surface of the loading platform 4 with an interval in the vehicle width direction. Each grounding roller support member 12 extends perpendicularly to the bottom plate of the loading platform 4, and holds the grounding roller 13 rotatably at the tip (lower end) thereof.

  FIG. 4 is a plan view of the loading platform slide tilting device shown in FIG. 1.

  In the truck 1, since the loading platform slide tilting device 5 is mounted, the loading platform 4 is slid in the front-rear direction to be stored on the chassis 2 (the state shown in FIG. 1) and lowered to the rear of the chassis 2. It can be displaced to an inclined state.

  The loading platform slide tilting device 5 includes a pair of guide rails 15 for guiding the loading platform 4 to slide. The pair of guide rails 15 are mounted on the chassis 2 at intervals in the vehicle width direction, and extend in the front-rear direction.

  FIG. 5 is a side view of the guide rail shown in FIG.

  The pair of guide rails 15 has a U-shaped cross section in which opposite sides (inner sides in the vehicle width direction) are opened. Then, as shown in FIG. 5, each guide rail 15 has a tilt guide portion 16 that slopes rearward and a direction parallel to the bottom plate of the loading platform 4 housed on the chassis 2 from the rear end of the tilt guide portion 16 ( Hereinafter, it is integrally provided with a front and rear guide portion 17 extending in a “horizontal direction”.

  Inside each guide rail 15, a guide roller 18 is provided so as to be able to roll. A guide roller support member 19 is fixed to the front end portion of the loading platform 4. The front end (lower end) of each guide roller support member 19 faces the guide rail 15 from the inside in the vehicle width direction, and the front end (lower end) faces the inside of the guide rail 15. An extending roller shaft 20 is formed. The guide roller 18 is rotatably supported by the roller shaft 20.

  Further, as shown in FIG. 6, the loading platform slide tilting device 5 extends in the vehicle width direction, and is attached to the rotating shaft 21 and a rotating shaft 21 that is rotatably provided at the rear end portion of the chassis 2. The sprocket 22 includes an electric motor 23 held by the chassis 2, a pulley 24 attached to the output shaft of the electric motor 23, and a chain 25 wound between the sprocket 22 and the pulley 24. The sprocket 22, the electric motor 23, the pulley 24 and the chain 25 are disposed between the pair of guide rails 15.

  As shown in FIG. 4, the electric motor 23 is electrically connected to a power circuit 26 including a transformer. An in-vehicle 12V battery 27 mounted on the truck 1 is electrically connected to the power circuit 26. The power supply circuit 26 is accompanied by a manual switch 28 for switching forward, reverse and stop of the electric motor 23. The power supply circuit 26 and the manual switch 28 are attached to, for example, a torii (not shown) provided between the cabin 3 and the loading platform 4.

  Further, the loading platform slide tilting device 5 is fixed to the lower surface of the loading platform 4 with a space between each other in the vehicle width direction, and is attached to a plurality of rack gears 29 extending in the front-rear direction over substantially the entire length of the loading platform 4 and the rotating shaft 21. , And a pinion gear 30 that meshes with each rack gear 29.

  When the manual switch 28 is operated from the state in which the loading platform 4 is stored on the chassis 2 so as to extend in the horizontal direction and the electric motor 23 is driven to rotate forward, the driving force of the electric motor 23 is changed to the pulley 24 and the chain 25. Then, the rotation shaft 21 is transmitted to the rotation shaft 21 via the sprocket 22 and the rotation shaft 21 rotates. The rotation of the rotating shaft 21 is transmitted to the rack gear 29 via the pinion gear 30. Thereby, the loading platform 4 moves rearward together with the rack gear 29.

  The movement of the loading platform 4 is guided by the guide rail 15, whereby the posture of the loading platform 4 is changed. That is, as the loading platform 4 moves, the guide roller 18 rolls backward in the guide rail 15. Since the inclined guide portion 16 of the guide rail 15 is inclined rearwardly upward, the guide roller 18 rolls backward in the inclined guide portion 16, so that the front end portion of the loading platform 4 has the pinion gear 30 as a fulcrum. It is lifted gradually. When the guide roller 18 reaches the front / rear guide portion 17 of the guide rail 15, the guide roller 18 then rolls rearward in the front / rear guide portion 17. Slide towards.

  When the guide roller 18 reaches the rear end portion of the guide rail 15, the guide roller 18 comes into contact with a mitt switch (not shown) provided at the rear end portion, and the electric motor 23 is stopped. At this point, the front end of the rack gear 29 has reached a position where it engages with the pinion gear 30, and the loading platform 4 is slid to the end as shown in FIG. 2, and the front end remains on the rear end of the chassis 2. The grounding roller 13 at the rear end is grounded, and is placed between the rear end of the chassis 2 and the ground in a posture inclined at an inclination angle of about 20 ° with respect to the horizontal direction.

  In this state, when the latch 11 is removed and the rear tilt 9 is expanded (tilted) outward with the hinge 7 as a fulcrum, the rear tilt 9 is installed between the loading platform 4 and the ground, and the upper surface of the loading platform 4 is It extends almost flush with the top surface of the bottom plate. Therefore, the rear tilt 9 can be used as a step board, and an object to be transported such as an agricultural machine can be moved on the rear tilt 9 and can be safely and easily loaded onto the loading platform 4.

  Further, after the object to be transported is unloaded from the loading platform 4, when the manual switch 28 is operated to drive the electric motor 23 in the reverse direction, the driving force of the electric motor 23 is changed to the pulley 24, the chain 25, the sprocket 22, the rotation. The load is transmitted to the rack gear 29 via the moving shaft 21 and the pinion gear 30, and the loading platform 4 moves forward together with the rack gear 29.

  The movement of the loading platform 4 is guided by the guide rail 15, whereby the posture of the loading platform 4 is changed. That is, the guide roller 18 rolls forward in the guide rail 15 with the movement of the loading platform 4. Since the front / rear guide part 17 of the guide rail 15 extends in the horizontal direction, the guide roller 18 rolls forward in the front / rear guide part 17, so that the cargo bed 4 slides forward and obliquely upward. When the guide roller 18 reaches the inclined guide portion 16 of the guide rail 15, the inclined guide portion 16 is inclined forward and downward, so that the guide roller 18 rolls forward in the inclined guide portion 16, With the pinion gear 30 as a fulcrum, the front end of the loading platform 4 is gradually lowered.

  When the guide roller 18 reaches the front end portion of the guide rail 15, the guide roller 18 comes into contact with a limit switch (not shown) provided at the front end portion, and the electric motor 23 is stopped. At this time, the rear end portion of the rack gear 29 reaches a position where it engages with the pinion gear 30, and the loading platform 4 is slid to the forefront and stored in a posture extending horizontally on the chassis 2 as shown in FIG. 1. Return to the state.

  In the platform slide tilting device 5, the sprocket 22, the electric motor 23, the pulley 24, and the chain 25 are disposed between the pair of guide rails 15, so that a large space is required between the chassis 2 and the platform 4. In addition, it is not necessary to change the ground height of the loading platform from a normal light truck that is commercially available from the manufacturer and has not been modified.

  Therefore, in a state where the loading platform 4 is inclined and installed between the rear end portion of the chassis 2 and the ground, the inclination angle of the loading platform with respect to the ground is about 30 ° or less (specifically, about 20 °). Therefore, it is possible to load and unload a transported object such as an agricultural machine on the loading platform 4 safely and easily.

  In addition, the loading platform slide tilting device 5 has a simple and lightweight configuration that employs the electric motor 23 as a drive source, and even if the loading platform slide tilting device 5 is mounted on a light truck, the maximum load capacity is not reduced, and the load carrying slide tilting device 5 is light. The utility of the truck is not impaired.

  As mentioned above, although one Embodiment of this invention was described, this invention can also be implemented with another form.

  For example, although the electric motor 23 is employed as the drive source of the cargo bed slide tilting device 5, a hydraulic motor may be employed.

  Further, a notification lamp is provided in the cabin 3, and the notification lamp is turned on when the guide roller 18 is not in contact with the limit switch actuator provided at the front end portion of the guide rail 15. Also good. Thereby, it is possible to make an operator (truck driver) recognize that the loading platform 4 is not stored, and it is possible to prevent the truck from traveling in a state where the loading platform 4 is not stored.

  Although the agricultural machine was illustrated as a to-be-conveyed object of the truck 1, the truck 1 can be used for conveyance of a senior car, a two-wheeled vehicle, etc. other than an agricultural machine.

  In addition, an example in which the loading platform slide tilting device 5 is mounted on a light truck with a flat body is taken up. However, the loading platform slide tilting device 5 is not limited to a light truck with a flat body, and the loading platform length is 3300 mm or less and the maximum loading capacity is 1000 kg or less. It can be mounted on a small truck.

  In addition, various design changes can be made within the scope of matters described in the claims.

  1: Truck, 2: Chassis, 4: Loading platform, 5: Loading platform tilting device, 15: Guide rail, 21: Rotating shaft, 22: Sprocket, 23: Electric motor, 24: Pulley, 25: Chain, 29: Rack gear , 30: Pinion gear

Claims (3)

A loading platform that is mounted on a truck having a loading platform length of 3300 mm or less, slides the loading platform of the truck rearward with respect to the chassis of the truck, and grounds the rear end portion of the loading platform so that the loading platform is inclined. A slide tilting device,
A pair of guide rails which are fixed to the chassis in the vehicle width direction and spaced apart from each other and for guiding the slide of the cargo bed;
A rotating shaft extending in the vehicle width direction and rotatably provided at the rear end of the chassis;
A sprocket attached to the pivot shaft;
A motor held in the chassis;
A pulley attached to the output shaft of the motor;
A chain wound between the sprocket and the pulley;
A pair of rack gears which are fixed to the lower surface of the cargo bed at a distance from each other in the vehicle width direction and extend in the front-rear direction over the entire length of the cargo bed;
A loading platform slide tilting device including two pinion gears attached to the rotating shaft and meshing with each rack gear.   The loading platform slide tilting device according to claim 1, wherein the motor is an electric motor. Chassis and
A loading platform provided on the chassis and having a loading platform length of 3300 mm or less;
A truck comprising the loading platform slide tilting device according to claim 1.

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