JPS6332055Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for tilting and jacking a truck with a tilting cab.

In large trucks equipped with tilt-type cabs, it is often necessary to jack up the axle for purposes such as tire replacement, puncture repair, or installation of ice and snow chains, and for this reason, manually operated hydraulic jacks are widely used. However, this type of jack has the disadvantage of requiring a large amount of operating effort and time because it is manually operated.

The present invention was devised in view of the above, and includes a tilt hydraulic cylinder that is connected to the cab of a truck and tilts the cab, a hydraulic pump that supplies working pressure oil to the tilt hydraulic cylinder, and the tilt hydraulic cylinder and the hydraulic pump. a tilt operating valve interposed between the tilt operating valve and the tilt hydraulic cylinder for controlling the raising and lowering of the cab, a hydraulic jack for lifting the axle of the truck, and a first tilt operating valve interposed between the tilt operating valve and the tilt hydraulic cylinder; A cab tilt for a truck characterized by having a switching valve configured to communicate the tilt operating valve with a tilt hydraulic cylinder in a switching position and communicate the tilt operating valve with a hydraulic jack in a second switching position. and a jacking device.

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. In the figure, reference numeral 10 denotes an electric hydraulic pump (not shown) constituting a hydraulic power source for cab tilt of the truck;
12 is an emergency manual hydraulic pump that manually generates hydraulic pressure in the event of a failure of the electric hydraulic pump 10 or its drive motor; 14 is a manually operated tilt operation valve connected to the discharge sides of the hydraulic pumps 10 and 12; 16; 18 is a double-acting tilt hydraulic cylinder, and its piston rod 1
The end of the cylinder 8' is pivotally connected to the frame of the cab (not shown), and the cylinder side is pivotally connected to the body frame of the truck. 20 and 22 are the piston one side chamber 18a and the other side chamber 18b of the hydraulic cylinder 18.
First and second pilot-operated check valves are interposed in oil passages 24 and 26, respectively, which communicate with the valve 2, and the pilot ports of these check valves are connected to the opposite valve 2.
It communicates with oil passages 26 and 24 which lead to oil passages 2 and 20. 28 is a manually operated switching valve having two outlet passages 28a and 28b; in its first switching position, the oil passage 24 and outlet passage 28a communicate with each other; and in its second switching position, The outlet passage 28b communicates with a hydraulic jack 32, which is known per se, through a flexible hose 30, and communication between the tilt hydraulic cylinder 18 and the tilt operation valve 14 is cut off. In addition, the above-mentioned tilt operation valve 1
Reference numeral 4 denotes a rising oil passage 14a that rotates the cab upward around its pivot axis, a descending oil passage 14b that rotates the cab that is rising downward, and a jack oil that supplies working pressure to the hydraulic jack 32. When the operation valve is operated from a rest position (not shown) to each of the above positions, the drive motor 34 of the electric hydraulic pump 10 is energized in conjunction with the operation valve.

In the above device, when the hydraulic jack 32 is not used, the switching valve 28 is operated to the first switching position, the outlet passage 28b is closed by a suitable plug, while the flexible hose 30 and the hydraulic The jack 32 is removed and stored at a suitable location inside the vehicle. Therefore, by operating the tilt operation valve 14 upward, the discharge side of the hydraulic pump 10 becomes the upward oil passage 14a and the outlet passage 28 of the switching valve 28.
a, it enters the one side chamber 18a of the tilt hydraulic cylinder 18 through the oil passage 24 and the check valve 20, the piston rod 18' moves to the right, and the cab starts to rotate upward. At this time, the hydraulic oil in the chamber 18b on the other side of the piston flows out into the oil reservoir 36 via the second pilot operated check valve 22 which is opened by the pilot port pressure and the oil passage 26. Further, by lowering the tilt operation valve 14, contrary to the above, the piston other side chamber 1 of the tilt hydraulic cylinder 18 is opened.
Discharge pressure oil is supplied to the piston 8b, and the hydraulic oil in the piston one side chamber 18a is discharged to the oil reservoir 36, causing the piston rod 18' to move to the left and the cab to descend.

Next, when using the hydraulic jack 32 for tire replacement or tire chain wrapping, remove the plug blocking the outlet passage 28b of the switching valve 28 and connect the flexible hose 30. A hydraulic jack 32 is connected to the hose and the switching valve 28 is switched to the second position. Next, when the tilt operation valve 14 is operated to connect the oil passage 14c to the discharge side of the hydraulic pump 10, the electric motor 34 is driven and the discharge oil pressure of the hydraulic pump is adjusted to the jerk passage 14c, the outlet passage 28b of the switching valve 28, and the hose 30. Hydraulic jack 32
The heavy axle of the truck can be jacked up quickly and easily.

In addition, in the above embodiment, the tilt operation valve 1
4, a jack oil passage 14 dedicated to the hydraulic jack 32
c was provided, but the existing ascending or descending oil passage 14a,
Of course, it is also possible to use 14b as is. When the latter oil passage 14b is used, the switching valve 28 is of course installed in the other oil passage 26.

As mentioned above, the truck cab tilt and jack device according to the present invention includes a tilt hydraulic cylinder connected to the cab of the truck to tilt the cab, a hydraulic pump that supplies working pressure oil to the tilt hydraulic cylinder, and the tilt hydraulic cylinder. A tilt operating valve interposed between the hydraulic cylinder and the hydraulic pump and controlling the raising and lowering operation of the cab, a hydraulic jack that lifts the axle of the truck, etc., and an interposed between the tilt operating valve and the tilt hydraulic cylinder. and a switching valve configured to communicate the tilt operating valve with the tilt hydraulic cylinder in its first switching position and communicate the tilt operating valve with the hydraulic jack in its second switching position. The feature is that the hydraulic jack can be automatically and quickly driven by simply installing a simple switching valve 28 in the conventionally existing cab tilt hydraulic circuit, which is extremely convenient.

[Brief explanation of the drawing]

The accompanying drawing is a hydraulic circuit diagram showing an embodiment of the present invention. 10...Electric hydraulic pump, 28...Switching valve, 1
4...Tilt operation valve, 30...Flexible hose, 1
8...Tilt hydraulic cylinder, 32...Hydraulic jack.

Claims (1)

[Scope of utility model registration request] A tilt hydraulic cylinder that is connected to the cab of the truck and tilts the cab; a hydraulic pump that supplies working pressure oil to the tilt hydraulic cylinder; and a hydraulic pump that is interposed between the tilt hydraulic cylinder and the hydraulic pump to operate the cab up and down. a hydraulic jack for lifting the truck axle, etc.; and a hydraulic jack interposed between the tilt operating valve and the tilt hydraulic cylinder, which switches the tilt operating valve and the tilt hydraulic cylinder at a first switching position. A cab tilt and jack device for a truck, comprising a switching valve configured to communicate the tilt operating valve and a hydraulic jack in a second switching position.