KR19980044295A - Vehicle mounting jack - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable jack used for lifting a vehicle, and more particularly, to a vehicle mounting jack that can be used while mounted on a vehicle. And a hydraulic cylinder 10 having a piston rod 11 for lifting the vehicle, a support piece 12 having a predetermined size fixed to one end of the piston rod 11, and the front and rear of the hydraulic cylinder 10. Each solenoid valve 20 connected to the port, a hydraulic pump 30 for supplying hydraulic oil to the hydraulic cylinder 10 through the solenoid valve, and is connected by the hydraulic pump 30 and the cam 41 Drive means composed of an electric motor 40 for operating a pump; Solenoid valves through the up / down switches 51 and 52, the first and second relays 51a and 51b respectively operated by the up / down switches, and the first and second relays, respectively. Control means consisting of a battery 60 connected to control the operation direction of the drive and the operation of the drive motor 40, to automatically operate the jack only by the operation of the switch to lift the vehicle body to the desired height will be.

Description

Vehicle mounting jack

The present invention relates to a portable jack used for lifting a vehicle, and more particularly to a vehicle mounting jack that can be used while mounted on the vehicle.

In general, automobiles are equipped with essential equipment and tools for sale so that the driver can manage the vehicle by hand. Among the most common tire punctures are tools that can be replaced with spare tires. In the case of the screw jack is an essential work equipment that is indispensable when replacing such a spare tire.

1 is a view illustrating a state of use of a conventional screw jack.

First, the screw jack is placed at the jack point of the vehicle frame closest to the tire to be replaced. When the handle is connected to the jack and rotated, the top of the jack is lifted up by the rotation of the screw to lift the body.

At this time, rotate the handle until the tire is separated from the ground by a certain distance (max 30mm).

Until the vehicle is lifted through the conventional jacks having the above-described operation relationship, it is necessary to carry out the cumbersome process of removing the jack from the trunk → installing the jack → manipulating the steering wheel and performing reverse operation again after replacing the tire.

In addition, since all such work is dependent on manual work, the work is inefficient and consumes a lot of energy and time.

The technical problem of the present invention is that the jack is mounted on a vehicle and operated by hydraulic pressure by driving of a motor.

1 is a use state diagram of a conventional vehicle jack;

2 is an overall configuration diagram of a vehicle mounting jack according to the present invention;

Figure 3a and Figure 3b is a mounting position and mounting state of use of the present invention, respectively.

Figures 4a and 4b is an operating state diagram showing the up / down process of the vehicle according to the present invention, respectively.

Explanation of symbols on the main parts of the drawings

10: hydraulic cylinder 11: piston rod

12: support plate 20: solenoid valve

30: pump 40: electric motor

51, 52: up / down switch 51a, 52b: first and second relay

60: battery

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments, operations and effects of the present invention will be described in detail with reference to the accompanying drawings.

Figure 2 shows the overall configuration of a vehicle mounting jack according to the present invention.

The jack is composed of driving means for lifting the vehicle, respectively, installed at jack points on both sides of the frame 110 of the vehicle body, and control means for controlling the driving means in the cab of the vehicle.

The driving means includes a support piece 12 connected to the hydraulic cylinder 10, a hydraulic pump 30 and a solenoid valve 20 providing hydraulic pressure to the hydraulic cylinder 10, and an electric motor 40 connected to drive the hydraulic pump. It consists of.

The piston rod 11 of the hydraulic cylinder 10 is to have a length sufficient to touch the ground in the body frame, the support piece 12 is to be fixed by welding to one end of the piston rod.

Each solenoid valve 20 is connected to the front and rear ports of the hydraulic cylinder 10 so that the hydraulic oil from the hydraulic pump 30 is supplied to the hydraulic cylinder (10). And the hydraulic pump 30 uses a piston pump operated by the drive of the cam 41 fixed to the rotating shaft of the electric motor 40.

The control means includes up / down switches 51 and 52, first and second relays 51a and 51b operated by the up / down switches, respectively, and the first and second relays. Through each of the operation direction of the solenoid valve 20 and the operation of the drive motor 40 is composed of a battery 60 connected to.

Figure 3a shows the mounting position of the present invention, Figure 3b shows a mounting use state diagram of the present invention.

Referring to Figures 4a and 4b the operational relationship of the present invention having the above configuration is as follows.

The lifting method of the vehicle is to press the up switch 51 located on the control panel of the driver's seat so that the on state is maintained.

At this time, the power applied by the first relay 51a operates the motor 40 and simultaneously opens the solenoid valve 20 in the direction in which the piston rod 11 is relaxed. The rotation of the motor 40 causes the pump 30 to pump the hydraulic fluid on one side of the cylinder 10 to the other side so that one end of the support piece 12 is operated toward the ground by the relaxed piston rod 11. .

When the support piece 12 pushes up the vehicle and maintains a proper distance from the tire and the ground, the up switch 51 is turned off.

At this time, the power is cut off by the first relay 51a, the operation of the motor 40 is stopped, and the solenoid valve 20 is closed to block the flow of hydraulic oil.

That is, the operator can lift the vehicle to a desired height by controlling the operation of the jack only by the operation of turning on the up switch 51 for a predetermined time (see FIG. 4A).

Then, the tire and the disk pad can be inspected and replaced while the vehicle is lifted.

After the work is finished, the down switch 52 is turned on to lower the body again.

At this time, the drive motor 40 and the pump 30 are operated in the same state as the up state of the jack by the second relay 52a, but the solenoid valve 20 reverses the flow of hydraulic oil so that the piston rod 11 contracts. To be controlled.

Therefore, when the tire is in contact with the ground and the support piece 12 is sufficiently stored, the down switch 52 is turned off to stop the operation of the jack (see FIG. 4B).

In addition, in order to prevent the overload of the motor used for the operation of the jack can be configured to automatically stop the operation when a certain torque over the jack up or down operation.

The safety device of the jack connects the switches 71 and 72 which are turned on in series with the battery so that the power cannot be supplied when the engine is stopped and the parking brake is applied. Configure the circuit.

Meanwhile, the up / down switches 51 and 52 attached to the control panel of the driver's seat may be configured to operate independently, or may be configured to simultaneously operate both jacks of the front wheel and the rear wheel.

According to the above-described action, the present invention can lift the vehicle body by operating the jack at a desired position by simply operating a switch during maintenance of the vehicle such as tire replacement.

Therefore, it does not need to prepare according to the work automatically because there is an advantage that can work quickly to save the hassle and effort.

It is an object of the present invention to provide a jack for mounting a vehicle to increase the convenience, stability and work efficiency of the work by allowing the lifting by only operating the switch without installing and removing the jack.

Claims (5)

Drive means provided at jack points on both sides of the frame 110 of the vehicle body, respectively, to lift the vehicle; The vehicle mounting jack is installed in the cab of the vehicle and composed of control means for controlling the drive means. 2. The hydraulic cylinder according to claim 1, wherein the driving means includes a hydraulic cylinder (10) having a piston rod (11), a support piece (12) having a predetermined size fixed to one end of the piston rod (11), and the hydraulic cylinder. Each solenoid valve 20 connected to the front and rear ports of 10, a hydraulic pump 30 for supplying hydraulic oil to the hydraulic cylinder 10 through the solenoid valve, the hydraulic pump 30 and the cam 41 The vehicle mounting jack consisting of an electric motor (40) connected by the) to operate the pump. 2. The control device according to claim 1, wherein the control means includes up / down switches (51) and (52), first and second relays (51a) and (51b) operated by the up / down switches, respectively, Vehicle mounting jack consisting of a battery 60 connected to control the operation direction of the solenoid valve 20 and the operation of the drive motor 40 through the first and second relay, respectively. 2. The vehicle mounting jack according to claim 1, wherein a safety means is added for driving and manipulating the driving means and the control means only when the vehicle is in a stable state. 5. The vehicle according to claim 4, wherein the safety means is provided with a vehicle in which each of the switches 71 and 72, which are on when the engine is stopped and the parking brake is applied, is connected in series between the battery and the up / down switch. Jack.