JP3426022B2 - Lorry - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a truck in which the whole carrier moves back and forth and leans backward. More specifically, the present invention relates to an improvement of a lorry vehicle by a carrier movement control mechanism for balancing the load of a load when the vehicle is reduced in weight. 2. Description of the Related Art A lorry of the type in which the entire carrier moves back and forth and tilts rearward is disclosed in Japanese Utility Model Publication No. 55-101.
No. 76, Utility Model Publication No. 61-43623, and the like. These trucks were provided with a guide rail for tilting the carrier fixed on a chassis in order to incline the entire carrier backward. By devising the platform tilt guide rail, the platform tilt angle is stabilized, and the rear end of the platform moves to the ground contact position without deviating from the platform slide guide rail. This type of lorry has been widely used because it can stably move back and forth including the inclination of the entire carrier while maintaining a balance. However, in recent years, the number of laws and regulations surrounding vehicles has increased, and if devices for ensuring safety and saving labor are attached to the vehicles in response to the increase, so-called "reduced tonnage" will occur, and the load of luggage must be reduced. It has become. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned social circumstances, and reduces the weight of a vehicle body except for a conventionally used guide rail for tilting a platform, thereby reducing the weight of a vehicle. In addition, the truck is capable of stably moving and restoring the carrier without a guide rail for carrier inclination. In the conventional mechanical tilt guide rail system, the load is easily unbalanced due to the load position of the load when the load is slid, and it is necessary to balance the load by the weight of the front axle. In addition, since the chassis of the conventional car is cut in the vicinity of the rear of the rotating shaft for supporting the loading platform, when the loading platform is tilted without the guide rail for tilting, control of the weight movement of the loading platform until the rear support member contacts the ground. Becomes unstable. The present invention has solved the above-mentioned problem associated with the reduction of the weight of the vehicle body. [0005] That is, a lorry according to the present invention comprises a chassis and a shaft provided at a rear portion of the chassis.
To rotatably provided a loading platform sliding guide rail, the lorry having front and rear movable the installed cargo rails on the cargo bed sliding guide rail, load
The platform rail has its tip placed on the carrier guide rail,
The chassis is bent downward at an angle close to the angle when the carrier is tilted backward near the back of the carrier support rotation axis,
A hydraulic cylinder for load balancing is provided between the chassis and the guide rail for the slide of the platform, and the hydraulic cylinder and the hydraulic cylinder for the platform slide are interlocked to control the weight movement of the load when the platform is tilted. Features. [0006] Since the truck of the present invention has the above structure,
The weight reduction is achieved by eliminating the platform tilt guide rail, and the resulting instability of the load balance when the platform tilts can be sufficiently covered as described below. That is, for one, the chassis of the rear overhang portion of the cargo bed is left, and the chassis is bent downward at an angle close to the angle when the cargo bed is tilted rearward near the rear of the rotating shaft for supporting the cargo bed. By tilting the carrier backward while receiving the load at the portion, most of the load is supported by the rear tires (axes) of the car, so that the sense of stability is greatly increased and the durability is excellent. At the same time, the hydraulic cylinder provided between the chassis and the guide rail for sliding the load and the hydraulic cylinder for sliding the load are linked to balance the load and control the weight movement of the load when the load is inclined. As a result, the inclined loading platform can be stabilized and operated safely. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A truck according to the present invention will be described below with reference to the embodiment shown in the drawings. FIG. 1 is a rear side view of a truck in which a truck of the present invention is shown in an inclined state, FIG. 2 is a rear side view of the truck in a normal position, and FIG. 3 is a plan view of a lower portion of a rear portion of the truck. FIG. 4 is an explanatory diagram of a hydraulic pressure adjusting circuit. In the figure, 1 is a chassis, 2 is a rear wheel, 3 is a carrier, 4 is an axle, 5 is a guide rail for sliding a carrier, 6 is a carrier rail, 7 is a support member, 8 is a hydraulic cylinder for load balancing, and 11 is a rear portion of the chassis. It is a bent part. The carrier 3 is placed on a carrier rail 6, and the leading end of the carrier rail 6 is placed on a carrier slide guide rail 5 .
The guide rail 5 for loading and sliding is fixed to the chassis 1 via the shaft 4 while being mounted so as to be movable back and forth. The carrier 3 is a hydraulic cylinder 9 for the carrier slide (Fig. 3).
When it is moved in the front-rear direction, and is moved rearward, it gradually inclines rearward along with the load guide slide guide rail 5 around the shaft 4 depending on the state of the load, and only the load 3 moves along the chassis bent portion 11. After moving backward, the lower end of the loading platform 3 comes into contact with the ground. When the carrier 3 shifts from the normal position shown in FIG. 2 to the inclined state shown in FIG. 1, in order to prevent an abrupt change in inclination, a guide rail for carrier inclination has been conventionally used. Except for this, a hydraulic cylinder 8 for load balancing is used to reduce the weight. The load-balancing hydraulic cylinder 8 is provided so as to be connected to the rear bent portion 11 of the chassis and the guide rail 5 for sliding the platform, and is normally arranged as a pair on the left and right chassis as shown in FIG. The carrier 3 is a hydraulic cylinder 9 for sliding the carrier.
The load gradually moves rearward as it moves rearward, and accordingly, the balancing hydraulic cylinder 8 interlocked by the hydraulic adjustment circuit shown in FIG. 4 also operates to support the rearward load. When the center of gravity of the load exceeds the axis 4, the hydraulic cylinder 8 gradually changes the inclination angle between the guide rails 5 for slide of the load and the load 3 while controlling the load balance. What is necessary is just to make it move backward until the front-end | tip part of the carrier 3 touches down. When the carrier 3 is restored to the state shown in FIG. 2, the reverse process may be performed. The support member 7 is changed from the state shown in FIG. 2 to the state shown in FIG. 1 while being fixed to the guide rail for sliding the carrier, and serves to support the intermediate portion when the carrier is inclined. FIG. 4 shows an example of a hydraulic pressure adjusting circuit used in the present invention. In FIG. 4, the hydraulic cylinders 8 and 9 are the same as in FIGS.
3 is a flow control valve with a check valve, 14
Is a switching valve, 15 is a pressure regulating valve, and 16 is a hydraulic source connected to a hydraulic pump line. The valves 12 and 13 are configured so that the flow rate of the oil flowing through the hydraulic cylinder 8 for tilt balance of the carrier and the hydraulic cylinder 9 for sliding the carrier is automatically adjusted. In this way, even without the guide rails for tilting the carrier, it is possible to maintain the balance of the carrier 3 and use the truck with the inclined carrier type in the same manner as in the prior art. Since the present invention has the above-mentioned structure, the guide rail for tilting the platform is removed to reduce the weight, the rear portion of the chassis is machined to the angle at the time of tilting the platform, and the hydraulic cylinder for load balancing is formed. By arranging and linking this with the bed slide cylinder and the hydraulic adjustment circuit, the load movement by the slide of the bed can be used well, and the inclination of the bed can be controlled stably and safely. According to the present invention, the weight can be reduced by at least 250 kg, and the truck can be operated while strictly observing the vehicle inspection system and the road transportation law. [0017]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a rear side view showing a truck of a truck according to an embodiment of the present invention in a state where a carrier is inclined. FIG. 2 is a rear side view showing a normal state. FIG. 3 is a plan view showing a lower portion of a rear portion of the loading platform. FIG. 4 is an explanatory diagram of an example of a hydraulic pressure adjusting circuit for a loading platform sliding cylinder and a load balancing hydraulic cylinder. [Description of Signs] 1 chassis 2 rear wheel 3 carrier 4 carrier rotating shaft 5 carrier slide guide rail 6 carrier rail 7 support member 8 load balancing hydraulic cylinder 9 carrier slide hydraulic cylinder 11 chassis bent parts 12, 13 with check valve Flow control valve 14 Switching valve 15 Pressure regulating valve 16 Hydraulic source

Claims (1)

(57) [Claims] [Claim 1] A shaft provided on a chassis and a rear portion of the chassis.
Via rotatably provided a loading platform sliding guide rail, the lorry having front and rear movable the installed cargo rails on the cargo bed sliding guide rail, load
The platform rail has its tip placed on the carrier guide rail,
The chassis is bent downward at an angle close to the angle when the carrier is tilted backward near the back of the carrier support rotation axis,
A hydraulic cylinder for load balancing is provided between the chassis and the guide rail for the slide of the platform, and the hydraulic cylinder and the hydraulic cylinder for the platform slide are interlocked to control the weight movement of the load when the platform is tilted. Lorry featured.