JPS6342659Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a body-side power take-off device for a vehicle equipped with an electro-hydraulic cab tilt device.

In a vehicle equipped with an electro-hydraulic cab tilt device, a power unit for tilting the cab is pre-equipped in the vehicle chassis. Some of these cab tilt type vehicles utilize power in the bodywork mounted on the vehicle's chassis, such as lifting and lowering the body in vehicles with wing type bodies, and lifting and lowering the tailgate in vehicles with tailgate lifters. , raising and lowering the upper floor of a vehicle transport vehicle, etc., but in the past, a dedicated power unit was installed on the bodywork as the power source, which increased costs.

The purpose of the present invention is to reduce the cost of bodywork by making the power unit of the cab tilt device also serve as the bodywork side power unit. A first hydraulic chamber is defined by a cylinder attached to the vehicle body and a piston having a rod tip attached to the cab, and the first hydraulic chamber raises the cab and the second hydraulic chamber lowers the cab by supplying pressure oil. a first actuator having a hydraulic chamber; a cab tilt operation that is interposed between the first actuator and the hydraulic pump, and is capable of raising and lowering the cab by switching pressure oil supply to the first and second hydraulic chambers; The valve is interposed in an oil passage communicating between the cab tilt operation valve and the second hydraulic chamber, and supplies and discharges pressure oil to a second actuator on the bodywork side, and supplies pressure oil to the second hydraulic chamber. A switching valve for selecting one of the following, and a switch for energizing the electric motor to drive the hydraulic pump in response to displacement of the switching valve toward the pressure oil supply side with respect to the second actuator. This paper proposes a power take-off device for vehicle bodywork.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the vehicle hydraulic circuit shown in Fig. 1, 1 is an electro-hydraulic cab tilt device, which is installed on the chassis side of the vehicle and includes a power unit that is driven by an electric motor 2 and includes a hydraulic pump 4 that pumps oil in a reservoir tank 3. A cab tilt actuator 7 having first and second hydraulic chambers 7a and 7b defined by a cylinder 5 and a piston 6 having a rod tip attached to the cab side, a supply oil path 8 connected to a pump 4, and a reservoir. Discharge oil path 9 led to tank 3 and hydraulic chamber 7 of actuator 7
7a, and a cab tilt operation valve 12 that switches and controls communication with oil passages 10 and 11 connected to oil passages 10 and 11, respectively.

When the vehicle is running, the cab tilt device 1 is in the illustrated state. To raise the cab, turn on the cab tilt switch 13 to energize the motor 2 to drive the pump 4, and at the same time operate the cab tilt operating lever 14 to move the cab tilt operating valve 12 from the D ₁ (traveling/lowering) position shown in the figure. U ₁
(up) position, and the pressure oil from the pump 4 is supplied to the first hydraulic chamber 7a of the actuator 7 via the oil passages 8 and 11, while the oil in the second hydraulic chamber 7b of the actuator is supplied to the oil passage 10. 9 and return to the reservoir tank 3, and move the piston 6 to the left. Next, when lowering the cab, operate the operating lever 14 to move the cab tilt operation valve 12 to the _D1 position again, supplying pressure oil to the second hydraulic chamber 7b of the actuator via oil passages 8 and 10, The oil in the first hydraulic chamber 7a is returned to the reservoir tank 3 via the oil passages 11 and 9, the piston 6 is moved to the right, and the switch 13 is turned off when the cab has finished lowering.

In addition, 15 in the figure is a relief valve that is disposed in the oil path leading from the supply oil path 8 to the reservoir tank 3 and limits the hydraulic pressure generated by the pump 4 to a predetermined value, for example, using a ball or the like. This is a conventionally known hoppet type. Reference numeral 15' denotes a check valve disposed in each of the oil passages 10 and 11, and as shown by broken lines, oil passages branched from the oil passages 10 and 11 are mutually connected to the other check valve. . The check valve 15' opens the check valve disposed in the other oil passage when the pressure in one of the oil passages 10 and 11 exceeds a specified pressure, allowing the oil passages to communicate with each other. When pressure oil is supplied to the oil passage 11 and the oil pressure in the first oil pressure chamber 7a and the oil pressure in the oil passage 11 exceed the specified pressure, the check valve of the oil passage 10 is opened by the oil pressure in the branch oil passage and the oil passage 10 is opened. Since the pressure oil in the second hydraulic chamber 7b is communicated and discharged, the piston 6 is slid to the left in the drawing. Reference numeral 16 denotes an emergency manual hydraulic pump, which can pump oil by operating a lever 17 when the electric pump 4 breaks down.

Actuators installed on the chassis of a vehicle, such as for raising and lowering the body of a vehicle with a wing type body, for raising and lowering the tailgate of a vehicle with a tailgate lifter, and for raising and lowering the upper floor of a vehicle transport vehicle. 1
The bodywork side power take-off device for operating 8 is:
Oil passage 1 between the cab tilt operation valve 12 and the second hydraulic chamber 7b of the cab tilt actuator 7
When the switching valve 19 disposed in the 0 and the bodywork-side operating lever 20 of the switching valve 19 are moved to the U ₂ ' (up) position to raise the bodywork-side actuator 18, the motor is turned on. 2 and a switch 21 that energizes the pump 2 and drives the pump 4.

As shown in detail in FIG. 2, the switching valve 19 has an inlet port 22 connected to a portion of the oil passage 10 on the side of the cab tilt operation valve 12, and an outlet port 23 connected to a portion of the oil passage 10 on the side of the cab tilt actuator 7. , a valve body 28 equipped with a supply port 25 connected to the bodywork-side actuator 18 via an oil passage 24 and a discharge port 27 connected to the reservoir tank 3 via an oil passage 26, and switching of the bodywork-side operation lever 20. Depending on the operation, the above port 2
2, 23, 25, and 27.

Note that instead of manually switching the switching valve 19 using the operating lever 20, it is possible to perform the switching operation remotely using a solenoid or the like.

When the body actuator 18 is not operated, the switching valve 19 is in the N (neutral) position shown, and the spool 29 is in the center position, blocking the supply port 25 and the discharge port 27, while blocking the inlet port 22 and the outlet port. Since the port 23 is in communication with the port 23, pressure oil can be supplied only to the second hydraulic chamber 7b of the cab tilt actuator 7 via the oil passage 10, but the supply and discharge of pressure oil to the body-side actuator 18 is Not done. Bodywork side actuator 1
8, first hold the cab tilt operation valve 12 at the D ₁ (traveling/lowering) position. Next, move the bodywork side control lever 20 to U ₂ ′ (up).
When moved to the position, the switch 21 is turned on, the motor 2 is energized, the pump 4 is driven, and pressure oil is sent to the oil path 8. At the same time, the switching valve ₁₉
(up) position, the spool 29 is moved to the left end position in FIG. Oil flows into the actuator 18 through the oil passage 24 and causes it to move upward. When the actuator 18 is moved downward, when the operating lever 20 is moved to the D ₂ ' (lower) position, the switch 21 is turned off and the drive of the pump 4 is stopped. At the same time, the switching valve 19
is moved to the D ₂ (down) position, the spool 29 is moved to the right end position in FIG.
5 and the discharge port 27 are communicated with each other,
Pressure oil in the actuator 18 flows through oil passages 24 and 26.
The liquid is discharged to the reservoir tank 3 through the process, and the actuator 18 is operated to move downward. After the operation of the body actuator 18 is completed, by returning the operating lever 20 to the N' position, the cab tilt actuator 7 can be operated normally as in the normal case without the switching valve 19.

As described above, the present invention uses the power unit consisting of the electric motor 2 and the hydraulic pump 4 of the electro-hydraulic cab tilt device 1 as a power take-off device for the bodywork side, and also serves as the power unit for operating the bodywork side actuator 18. In addition, a switching valve 19 is provided in the middle of the oil passage 10 between the power unit of the cab tilt device and the cab tilt actuator 7, and the bodywork side actuator 18 is operated by selectively switching the valve. Because of this structure, there is no need to provide a dedicated power unit on the bodywork side as in the conventional case, which has the effect of significantly reducing the cost of the bodywork mounted on the chassis of the vehicle.

In addition, only when the cab tilt operation valve 12 is in the D ₁ (traveling/lowering) position, the switching valve 19
Since the body-side actuator 18 can be activated by operating the switch valve, even if the changeover valve is operated incorrectly, the cab will never suddenly tilt, making it safe.

[Brief explanation of the drawing]

FIG. 1 is a hydraulic circuit diagram of an electro-hydraulic cab tilt device and a body side power take-off device showing an embodiment of the present invention, and FIG. 2 is a detailed sectional view of the switching valve shown in FIG. 1. 1...Electro-hydraulic cab tilt device, 2...Electric motor, 3...Reservoir tank, 4...Hydraulic pump, 5...Cylinder, 6...Piston, 7...
Cab tilt actuator, 7a, 7b...
Hydraulic chamber, 8... Supply oil path, 9... Discharge oil path, 1
0, 11, 24...Oil passage, 12...Cabin tilt operation valve, 16...Manual hydraulic pump, 18...
...Bodywork side actuator, 19...Switching valve,
20... bodywork side operation lever, 21... switch.

Claims (1)

[Scope of utility model registration request] A first hydraulic chamber is defined by a hydraulic pump driven by an electric motor, a cylinder attached to the vehicle body, and a piston having a rod tip attached to the cab, and the first hydraulic chamber raises the cab and the second hydraulic chamber lowers the cab by supplying pressure oil. a first actuator having two hydraulic chambers; a first actuator interposed between the first actuator and the hydraulic pump;
a cab tilt operating valve capable of raising and lowering the cab by switching the pressure oil supply to the hydraulic chamber; a second actuator on the bodywork side that is interposed in an oil passage communicating the cab tilt operating valve and the second hydraulic chamber; a switching valve that selects between supplying and discharging pressure oil to the second hydraulic chamber and supplying pressure oil to the second hydraulic chamber; A power take-off device for a vehicle bodywork, comprising a switch that energizes the electric motor to drive a pump.