CN202243730U - Cab overturning device for cab-over-engine truck - Google Patents

Abstract

The utility model discloses an overturning device for a driver's cab of a flat-headed truck, which comprises a driver's cab whose lower front end is hinged on the frame chassis, and is characterized in that a four-bar lifting mechanism and a The lifting mechanism, the four-bar lifting mechanism includes four connecting rods whose ends are hinged to each other to form a rhombus. One end of the rhombus formed by the four connecting rods is hinged on the chassis of the frame, and the other end of the diagonal is correspondingly hinged on the cab. Below; the pushing mechanism includes a telescopic rod with telescopic control function, the telescopic rod is arranged horizontally and the front end is connected to a hinge point in the middle of the four-bar lifting mechanism. The turning device of the utility model has the advantages of simple structure, low cost, favorable implementation, high efficiency, high safety and strong operability.

Description

Truck Cab Overturning Device

technical field

The utility model relates to an overturning mechanism used on automobiles, in particular to an overturning device for cabs of flat trucks.

Background technique

At present, the flat head, large size and comfort of medium and heavy trucks in my country have become the development trend. The flat head design makes the engine must be placed under the cab. In order to facilitate the maintenance of the engine and other components, a flat head truck cab is proposed. Forward flipping requirements, but the cab quality of medium and heavy trucks is mostly 600-800kg, and the cab quality of some heavy trucks can reach 1000kg, so the required flipping force is relatively large, which poses a challenge to the cab flip mechanism. higher requirements. The torsion bar turning mechanism commonly used on domestic heavy-duty vehicles is only suitable for cabs with a lighter tonnage. At the same time, the determination of the working angle of the torsion bar has a great impact on the service life of the torsion bar. Under the action of torque and constant vibration for a long time, the stiffness gradually decays, and finally the cab is difficult to turn up and fails, and the torsion bar locks a safety hazard. Although the heavy-duty vehicles equipped with manual hydraulic turning mechanism can carry a heavy cab, due to the poor reliability of the current hydraulic parts, the hydraulic lifting mechanism has many failures in use, and because it is completely manual, the turning speed is extremely high. slow.

In existing domestic patents, there are also some mechanisms for overturning automobile cabs, such as a cab overturning device disclosed in my country's application number 200710169917.4, and a vehicle cab overturner disclosed in my country's application number 200610147339.X. All of them can be used to realize the turning over of the vehicle cab, but they also have the disadvantages of complex structure and relatively large potential safety hazards.

Utility model content

Aiming at the above-mentioned deficiencies in the prior art, the technical problem to be solved by the utility model is: how to provide a cab overturning device for cabs of trucks with simple structure, little potential safety hazard and reliable operation.

In order to solve the problems of the technologies described above, the following technical solutions are adopted in the utility model:

An overturning device for cabs of flat trucks, comprising a cab hinged on the frame chassis below the front end, characterized in that a four-bar lifting mechanism and a pushing mechanism are arranged below the cab after the front hinge. The four-bar lifting mechanism includes four connecting rods whose ends are hinged to each other to form a rhombus. One end of the rhombus formed by the four connecting rods is hinged on the frame chassis, and the other end of the diagonal is correspondingly hinged below the cab; The mechanism includes a telescopic rod with a telescopic control function, the telescopic rod is arranged horizontally and its front end is connected to a hinge point in the middle and rear of the four-bar lifting mechanism.

In the utility model, the lifting mechanism is composed of four hinged connecting rods, and its structure is simple. At the same time, under the promotion of the lifting mechanism, the lifting is realized according to the principle of levers, which has the characteristics of good labor saving and high efficiency. The pushing mechanism can adopt any existing mechanism with telescopic control function, such as a finished hydraulic cylinder, a pneumatic telescopic mechanism, a screw nut telescopic mechanism driven by a servo motor, etc., but the following pushing mechanism is preferably used.

As an optimized form of the pushing mechanism, the pushing mechanism includes an oil storage tank, an oil pump motor, a one-way valve, an overflow valve, a three-position four-way electromagnetic reversing valve, a throttle valve, and an oil cylinder with a telescopic arm; the oil pump One end of the motor is connected to the oil storage tank through the oil pipe, and the other end is connected to the one-way valve through the oil pipe, and then connected to an oil inlet port of the three-position four-way electromagnetic reversing valve. The reversing valve is connected to the overflow valve through an oil pipe and then connected back to the oil storage tank, and the oil return interface of the three-position four-way electromagnetic reversing valve is connected back to the oil storage tank through a pipeline, and the three-position four-way solenoid valve is connected to the oil storage tank through a pipeline. The two oil outlet ports of the electromagnetic reversing valve are respectively connected to the two ends of the piston in the oil cylinder through the oil pipe. The telescopic arm of the oil cylinder is the above-mentioned telescopic rod, and the telescopic arm is set on the piston in the oil cylinder; The throttle valve is arranged in the oil pipe between the valve and the oil cylinder.

After this optimization, when the oil pump motor is started, the pressure oil enters the three-position four-way electromagnetic reversing valve through the check valve, and the excess oil will flow back to the oil storage tank through the overflow valve. At this time, the three-position four-way electromagnetic reversing valve controls In the right position, the cab will be lifted slowly due to the action of the throttle valve to ensure safety. After reaching the specified position, the three-position four-way electromagnetic reversing valve is controlled in the middle position to ensure that the pressure in the oil cylinder remains unchanged, thereby ensuring that the cab is fixed at the specified position. At this time, it is convenient to overhaul the engine. After the overhaul is completed, control the three-position four-way electromagnetic reversing valve to the left position, the oil inlet of the oil cylinder becomes the oil outlet, and the oil outlet becomes the oil inlet. fall. Therefore, it has the advantages of reliable operation and small potential safety hazard.

As a further optimization, a manual oil pump mechanism is also connected in parallel on the oil pipes at both ends of the oil pump motor. After such optimization, when the electric power of the oil pump motor is insufficient, it can be lifted by manually pumping oil to ensure that the turning device can also be used normally when the electric power is insufficient. Wherein said manual oil pump mechanism is a mature existing finished product, so it will not be described in detail here.

To sum up, the turning device of the present invention has the following advantages. 1. The structure is simple, the cost is cheap, and it is convenient for implementation. 2. High efficiency. The cab can be turned around the front fulcrum in a short turning period, which facilitates the inspection, maintenance and repair of the automobile engine. 3. High safety, with double insurance of hydraulic system and traditional locking mechanism. 4. Strong operability, saving time and labor compared with manual hydraulic mechanism, and improving operability.

Description of drawings

Fig. 1 is the structural representation when the utility model is concretely implemented.

Fig. 2 is a schematic structural view of the pushing mechanism adopted during the concrete implementation of the utility model.

Detailed ways

The structure of the present utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

During specific implementation, as shown in Figure 1: a cab overturning device for flat-headed trucks, comprising a cab 1 hinged on the frame chassis below the front end, wherein, the bottom of the cab 1 is located behind the hinge at the front end and is also provided with four A rod lifting mechanism 3 and a pushing mechanism, the four-bar lifting mechanism 3 includes four connecting rods whose ends are hinged to each other to form a rhombus, one end of the rhombus formed by the four connecting rods is hinged on the frame chassis, and the diagonal The other end is hinged below the cab 1; the pushing mechanism includes a telescopic rod 2 with a telescopic control function, the telescopic rod 2 is horizontally arranged and the front end is connected to a hinge point in the middle of the four-bar lifting mechanism 3 rear.

During specific implementation, the referral mechanism includes an oil storage tank 4, an oil pump motor 11, a one-way valve 10, an overflow valve 6, a three-position four-way electromagnetic reversing valve 7, a throttle valve 8, and a telescopic arm as shown in Figure 2. One end of the oil pump motor 11 is connected to the oil storage tank 4 through an oil pipe, and the other end is connected to the one-way valve 10 through an oil pipe and then connected to an oil inlet of the three-position four-way electromagnetic reversing valve 7 interface, the check valve 10 and the three-position four-way electromagnetic reversing valve 7 are connected to the overflow valve 6 through an oil pipe and then connected back to the oil storage tank 4, and the three-position four-way electromagnetic reversing valve 7 The oil return interface is connected back to the oil storage tank 4 through a pipeline, and the two oil outlet interfaces of the three-position four-way electromagnetic reversing valve 7 are respectively connected to the two ends of the piston in the oil cylinder through oil pipes. The telescopic arm of the oil cylinder 9 is the above-mentioned The telescopic rod 2 and the telescopic arm are arranged on the piston in the oil cylinder; the throttle valve 8 is arranged in the oil pipe between the three-position four-way electromagnetic reversing valve 7 and the oil cylinder 9 . A manual oil pump mechanism 5 is also connected in parallel on the oil pipes at both ends of the oil pump motor 11 .

Claims (3)

1. A cab overturning device for flat trucks, comprising a cab hinged on the frame chassis below the front end, characterized in that a four-bar lifting mechanism and a pushing mechanism are arranged below the cab below the front hinge, The four-bar lifting mechanism includes four connecting rods whose ends are hinged to each other to form a rhombus. One end of the rhombus formed by the four connecting rods is hinged on the frame chassis, and the other end of the diagonal is correspondingly hinged below the cab; The lifting mechanism includes a telescopic rod with a telescopic control function, the telescopic rod is arranged horizontally and its front end is connected to a hinge point in the middle of the four-bar lifting mechanism. 2. The overturning device for cabs of trucks as claimed in claim 1, wherein the pushing mechanism comprises an oil storage tank, an oil pump motor, a one-way valve, an overflow valve, a three-position four-way electromagnetic reversing valve, a throttling Valve, oil cylinder with telescopic arm; one end of the oil pump motor is connected to the oil storage tank through the oil pipe, and the other end is connected to the one-way valve through the oil pipe and then connected to an oil inlet of the three-position four-way electromagnetic reversing valve interface, the one-way valve and the three-position four-way electromagnetic reversing valve are connected to the overflow valve through the oil pipe and then connected back to the oil storage tank, and the oil return interface of the three-position four-way electromagnetic reversing valve is connected through the pipeline Connecting back to the oil storage tank, the two oil outlet ports of the three-position four-way electromagnetic reversing valve are respectively connected to the two ends of the piston in the oil cylinder through oil pipes. The telescopic arm of the oil cylinder is the above-mentioned telescopic rod, and the telescopic arm is arranged on the On the inner piston; the throttle valve is arranged in the oil pipe between the three-position four-way electromagnetic reversing valve and the oil cylinder. 3. The overturning device for cabs of trucks according to claim 2, wherein a manual oil pump mechanism is connected in parallel to the oil pipes at both ends of the oil pump motor.

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