JP2004231130A - Loading space tilting device for truck - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a tilting angle and lower the level of a loading space during storage while shortening a loading space moving distance, without using a chain. <P>SOLUTION: This loading space tilting device for a truck comprises a guide frame 3 provided on a chassis frame 2, a moving frame 4 adaptable for movement and tilting while being guided by the guide frame 3, and the loading space 5 adaptable for longitudinal movement while being guided by the moving frame 4. The moving frame 4 is constituted by a loading space guide rail 6 for guiding a front portion of the loading space, a rear stay 7 for guiding a rear portion of the loading space, and a connecting frame 8 connecting the loading space guide rail 6 to the rear stay 7. Bendable portions 3b, 6b bendable downward are provided at the rear end of the guide frame 3 and at the rear end of the loading space guide rail 6, respectively, a moving frame cylinder 9 is provided between the chassis frame 2 and the loading space guide rail 6, and a loading space sliding cylinder 11 is provided between the connecting frame 8 and the loading space 5. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a truck tilting device for a truck, which makes it possible to reduce the angle of tilt of the truck when moving and tilting the platform backward for loading and unloading cargo, thereby facilitating loading and unloading.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a truck having a small inclination angle while reducing the amount of movement of the cargo bed to the rear, there is a truck capable of loading the cargo by lowering the cargo bed to a position almost horizontally above the ground immediately behind a chassis frame.
The lorry is mounted on a vehicle body so as to be tiltable, and has a lift frame having a bent portion bent downward from a horizontal portion at a rear end side, and a lift frame slidably mounted on the lift frame along the horizontal portion and the bent portion. A loading platform that is slid up and down, a guide support member that is provided near the boundary between the horizontal portion and the bent portion of the lift frame and guides and supports the loading platform, one end is fixed to the front end of the lift frame, and the other end is lifted. A chain fixed to the rear end of the frame and stretched on the lift frame, a case, a hydraulic motor, a drive shaft driven by the hydraulic motor, and a sprocket engaged with the chain from below and fixed to the drive shaft. And a drive unit in which the case is removably bolted to the front of the bed by sliding the bed against the lift frame. .
[0003]
When the lift frame moves backward and tilts, the bent portion moves to near the ground immediately after the chassis frame. When the sprocket at the front end of the carrier rolls in the horizontal part, the carrier tilts rearward, and when the sprocket rolls further in the bend, the inclination angle of the carrier decreases corresponding to the curvature of the bend. . Therefore, when the loading platform retreats beyond the chassis frame, the inclination angle is sharply reduced, and a low inclination angle is realized even if the backward movement distance is short (see Patent Document 1).
[0004]
[Patent Document 1]
JP-A-4-166434
[Problems to be solved by the invention]
However, in this truck, since the carrier is moved by the chain, foreign matter such as pebbles may bite into the chain and cause malfunction. Since the chain is stretched over the entire area of the lift frame, the possibility of cutting is increased and reliability is low. Chains need to be maintained frequently because they are stretched by use. In addition, since the rattling noise is generated by the contact between the chain and the sprocket, it cannot be used in a situation where quietness is required, such as in a residential area at night.
[0006]
Further, since the bent portion of the lift arm extends rearward from the rear end of the chassis frame and hangs downward while the loading platform is stored, a large departure angle cannot be obtained. If the lift arm is advanced so that the bent part fits on the chassis frame, the front end side of the bed must be raised by the height of the bent part in order to keep the bed parallel to the chassis frame. In addition, the height of the bed during storage is increased, the position of the center of gravity is raised, and the stability is deteriorated. In addition, the posture of the bed is suddenly changed between the storage position and the loading position, which is not preferable.
[0007]
The present invention solves the above-described problems in the truck tilting device of a truck, and reduces the tilt angle while shortening the moving distance of the truck without using a chain. An object of the present invention is to provide a truck tilting device for a truck, which can be simplified, has low noise, and can reduce the height of the truck during storage.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, a truck tilting device for a lorry according to the present invention includes a guide frame provided on a chassis frame, a movable frame guided and guided by the guide frame, and movable forward and backward guided by the movable frame. In a truck tilting device having a carrier, a moving frame is configured by a carrier guide rail for guiding a front portion of a carrier, a rear stay for guiding a rear portion of the carrier, and a connecting frame for connecting the carrier guide rail and the rear stay. A bending portion that bends downward at the rear end of the guide frame and the rear end of the carrier guide rail is provided, and a movable frame cylinder is provided between the chassis frame and the carrier guide rail, and the connecting frame or the rear stay is connected to the carrier. A carrier slide cylinder is provided between them.
[0009]
In this loading bed tilting device, when the moving frame cylinder is extended from the storage position, the moving frame is guided backward by the guide frame and moves backward and tilts. When the moving frame cylinder reaches the stroke end, the rear stay comes into contact with the ground. At this time, in the moving frame, the connecting frame enters the bent portion of the guide frame, the carrier guide rails have a moderate inclination, the connecting frame has a steep inclination, and the rear stay has a gentle inclination. The carrier tilts to near the tilt angle of the carrier guide rail.
[0010]
Next, when the carrier slide cylinder is extended, the carrier is guided by the front half of the carrier guide rail, and moves substantially linearly rearward until the rear end of the carrier contacts the ground. When the carrier slide cylinder is further extended, the carrier moves downward with the front end guided by the bent portion of the carrier guide rail, and the inclination becomes gentle.When the stroke end, that is, the loading position, is reached, the carrier forms a rear stay. Approaching the angle of inclination.
[0011]
Since the movement trajectory between the movable frame cylinder and the mounting portion of the carrier guard rail is substantially horizontal, the movable frame cylinder that is being extended and retracted is always substantially parallel to the chassis frame. On the other hand, the loading platform slide cylinder has a slight angle with respect to the loading platform at the start of extension because the connecting frame is guided by the bending portion of the guide frame and is bent downward, and at the stroke end, Since it is substantially parallel to the carrier, the carrier and the carrier slide cylinder do not interfere during the extension operation.
[0012]
As described above, it is possible to shorten the moving distance of the carrier and reduce the inclination angle of the carrier without using a flexible driving means such as a chain.
The rear end of the bent portion of the carrier guide rail is opened, and a fixed rail is formed at the rear end of the chassis frame to contact the bent portion of the carrier guide rail to form a continuous rail when the moving frame reaches the rear end position. Thus, the length of the bent portion of the carrier guide rail can be reduced, and the carrier height during storage can be reduced.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a side view showing a stored state of a truck tilting device according to an embodiment of the present invention, FIG. 2 is a side view showing a fully extended state of a moving cylinder, and FIG. 4, FIG. 4 is a side view showing the fully extended state of the bed cylinder, FIG. 5 is a plan view of the moving frame, FIG. 6 is a sectional view taken along line AA of FIG. 1, FIG. 7 is a sectional view taken along line BB of FIG. 8 is a sectional view taken along line CC of FIG. 1, FIG. 9 is a sectional view taken along line DD of FIG. 2, FIG. 10 is an enlarged side view showing the vicinity of the connection frame of FIG. 2, and FIG. FIG. 12 is an enlarged side view showing the vicinity of the portion, and FIG. 12 is an enlarged side view showing the vicinity of the fixed rail and the front end of the loading platform in FIG.
[0014]
On the chassis frame 2 of the lorry 1, a guide frame 3, a movable frame 4 guided by the guide frame 3 and movable, and a loading platform 5 guided by the movable frame 4 and movable back and forth are provided. . At the rear of the chassis frame 2, a guide frame rear roller 2 a that rolls and supports the carrier 5 is provided.
The guide frame 3 is fixed to the chassis frame 2, and has a front bending portion 3 a bent downward at a front end portion, and a rear bending portion 3 b bent downward at a rear end portion.
[0015]
The moving frame 4 includes a carrier guide rail 6 for guiding the front of the carrier 5, a rear stay 7 for guiding the rear of the carrier 5, and a connecting frame 8 for connecting the carrier guide rail 6 and the rear stay 7. .
A moving frame cylinder 9 is provided between the chassis frame 2 and the carrier guide rail 6, and a carrier slide cylinder 10 is provided between the connecting frame 8 and the carrier 5.
[0016]
A front stay 11 having a front stay roller 11a at a lower end is provided at a front portion of the carrier guide rail 6, and a rear end of the movable frame cylinder 9 is attached to a cross member at a rear portion of the carrier guide rail 6. The stay roller 11a can be guided and moved along the guide frame 3.
At the rear end of the platform guide rail 6, there is provided a bending portion 6b which bends downward and guides the platform roller 5b downward. The rear end of the bending portion 6b is open.
[0017]
At the rear end of the chassis frame 2, there is provided a fixed rail 12 that contacts the bending portion 6b of the carrier guide rail 6 to form a continuous rail when the carrier guide rail 6 moves rearward and reaches the rear end position. ing.
The connecting frame 8 has a front end connected to the carrier guide rail 6 and a rear end connected to the rear stay 7 by connecting pins so as to be freely bent up and down. Connecting frame rollers 8a and 8b are respectively connected to the central axes of the front and rear connecting pins. Is provided.
[0018]
One end of the bed slide cylinder 10 is attached to the cross member at the rear end of the connection frame 8, and the mounting axis substantially coincides with the center axis of the connection frame roller 8b. In addition, one end of the bed slide cylinder 10 may be attached by providing a cross member at the front end of the rear stay 7, but in this case, the attachment axis and the center axis of the connecting frame roller 8b are made to substantially coincide with each other.
[0019]
The carrier 5 is provided with a carrier rail 5a at the bottom and a carrier roller 5b at a front end thereof. At the rear end of the carrier 5, a carrier ground roller 5c is provided.
At the rear of the rear stay 7, a support leg 13 provided with a support leg ground roller 13a at the lower end is provided. A rear stay roller 7a that rolls in the carrier rail 5a and supports the carrier 5 near the support leg 13 is provided. Is provided.
[0020]
When the movable frame cylinder 9 is extended from the storage position shown in FIG. 1, the front stay roller 11a is guided from the front bending portion 3a of the guide frame 3 to the horizontal portion, and the movable frame 4 moves backward while rotating clockwise. I do. When the movable frame cylinder 9 reaches the stroke end, the support leg grounding roller 13a of the support leg 13 of the rear stay 7 comes into contact with the ground, as shown in FIG. The bent portion 6b of the carrier guide rail 6 contacts the fixed rail 12 to form a continuous rail. It should be noted that there is no problem even if there is a slight gap between the bent portion 6b of the carrier guard rail 6 and the fixed rail 12.
[0021]
At this time, since the connecting frame rollers 5a and 5b of the connecting frame 8 enter the rear bending portion 3b of the guide frame 3, the moving frame 4 has a medium inclination of the loading platform guide rail 6, a steep inclination of the connecting frame 8, and a rear stay 7 Becomes a gentle slope.
When the movable frame cylinder 9 reaches the stroke end, the pressure oil that has been supplied to the movable frame cylinder 9 is supplied to the carrier slide cylinder 10 by the action of a switching valve (not shown), and the carrier slide cylinder 10 starts extending.
[0022]
When the carrier slide cylinder 10 is extended, the carrier 5 is guided by the front half of the carrier guide rail 6, and moves substantially linearly rearward until the carrier ground roller 5c at the rear end of the carrier 5 comes into contact with the ground as shown in FIG. Go. When the loading slide cylinder 10 further extends, the loading platform 5 moves downward while rotating counterclockwise while the loading roller 5a at the front end is guided by the bending portion 6b of the loading guide rail 6 and the fixed rail 12. When it becomes loose and reaches the stroke end, that is, the loading position shown in FIG. 4, the inclination of the carrier 5 approaches the inclination angle formed by the rear stay 7.
[0023]
Since the movement trajectory of the attachment portion between the movable frame cylinder 9 and the carrier guide rail 6 is substantially horizontal, the movable frame cylinder 9 during the expansion and contraction operation is always substantially parallel to the chassis frame 2. On the other hand, when the extension slide starts, the loading frame slide cylinder 10 is moved to the loading platform 5 because the front and rear connection frame rollers 8a and 8b are guided by the rear bending portion 3b of the guide frame and the connection frame 8 is bent downward. Since it has a slight angle with respect to the carrier and is substantially parallel to the carrier 5 at the stroke end, the carrier 5 does not interfere with the carrier slide cylinder 10 during the extension operation.
[0024]
When the loading platform 5 is returned from the loading position in FIG. 4 to the storage position in FIG. 1 and stored, the procedure is reversed. The bent portion 6b of the carrier guide rail 6 advances to a position above the chassis frame 2. However, since the length of the bent portion 6b is reduced by the length of the fixed rail 12, the carrier 5a needs to be maintained in a horizontal state. The amount of raising the front of 5 can be minimized, and the height of the bed 5 can be reduced.
The present invention is not limited to the above-described embodiment. For example, the shape of the bending portion may be arbitrarily selected, such as a straight line or a curved line.
[0025]
【The invention's effect】
As described above, the truck tilting device of the truck of the present invention uses a hydraulic cylinder instead of a chain, shortens the moving distance of the truck, reduces the tilt angle of the truck, and reduces the height of the truck during storage. Can be lower. In addition, there is little risk of malfunction or failure, maintenance can be simplified, and noise can be reduced.
[Brief description of the drawings]
FIG. 1 is a side view showing a storage state of a truck tilting device according to an embodiment of the present invention.
FIG. 2 is a side view showing a fully extended state of a moving cylinder.
FIG. 3 is a side view showing a state in which the bed is grounded.
FIG. 4 is a side view showing the full extension state of the bed cylinder.
FIG. 5 is a plan view of a moving frame.
FIG. 6 is a sectional view taken along line AA of FIG. 1;
FIG. 7 is a sectional view taken along line BB of FIG. 1;
FIG. 8 is a sectional view taken along line CC of FIG. 1;
FIG. 9 is a sectional view taken along line DD of FIG. 2;
FIG. 10 is an enlarged side view showing the vicinity of the connection frame of FIG. 2;
11 is an enlarged side view showing the vicinity of the front end of the loading platform of FIG. 3;
FIG. 12 is an enlarged side view showing the vicinity of the fixed rail and the front end of the loading platform in FIG. 4;
[Explanation of symbols]
DESCRIPTION OF REFERENCE NUMERALS 1 lorry 2 chassis frame 2a guide frame rear roller 3 guide frame 3a front bending portion 3b rear bending portion 4 moving frame 5 carrier 5a carrier rail 5b carrier roller 6 carrier guide rail 6b flexure 7 rear stay 7a rear stay roller 8 connecting frame 8a, 8b Connecting frame roller 9 Moving frame cylinder 10 Loading slide cylinder 11 Front stay 11a Front stay roller 12 Fixed rail 13 Support leg 13a Support leg ground roller

Claims (2)

What is claimed is: 1. A truck tilting device, comprising: a guide frame provided on a chassis frame, a movable frame guided and guided by the guide frame, and a movable platform guided by the movable frame. Is composed of a carrier guide rail that guides the front of the carrier, a rear stay that guides the rear of the carrier, and a connection frame that connects the carrier guide rail and the rear stay. A truck provided with a bending portion that bends downward, a moving frame cylinder between the chassis frame and the carrier guide rail, and a carrier slide cylinder between the connecting frame or the rear stay and the carrier. Bed tilt device. A fixed rail is provided at the rear end of the chassis frame to open the rear end of the bent portion of the carrier guide rail and to form a continuous rail by contacting the bent portion of the carrier guide rail when the moving frame reaches the rear end position. 2. The truck tilting device according to claim 1, wherein:

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