JP5074740B2 - Winch equipment for lorry - Google Patents

Description

  The present invention relates to a winch device that is installed in a truck and used for loading and unloading loads.

Some trucks are equipped with a winch device for loading and unloading loads. The winch device includes a clutch. When the clutch is engaged, the power of the driving motor is transmitted to the winch drum, and the winch is wound up and down.
A configuration of a hydraulic circuit of a conventional winch device for a truck is shown in FIG. 4 (see Patent Document 1). The winch device 1 of this lorry includes a drive motor 10, a clutch 12 that transmits the power of the drive motor 10 to a winch drum, a clutch cylinder 14 that operates the clutch 12 to the inward side, and the clutch 12 to the off side. And a manual lever 30 to be operated. When the clutch 12 is in the engaged state, the power of the driving motor 10 is transmitted to the winch drum, and the winch is wound up and down. When the clutch 12 is in the disconnected state, the power of the driving motor 10 is Is not transmitted to the winch drum and can be manually pulled out.

  The drive motor 10 is connected to the winch operation valve 32 by a winding pipe 40 and a winding pipe 46. The winch operation valve 32 is connected to the hydraulic oil pump 34 by a discharge line 38 and is connected to the hydraulic oil tank 36 by a return line 39. The oil chamber 18 of the clutch cylinder 14 that operates the clutch 12 to the entry side is connected to the hoisting conduit 40 of the drive motor 10. A double check valve 50 is provided in the winding line 40 between the drive motor 10 and the clutch cylinder 14 and the winch operation valve 32, and a double check valve 52 is provided in the winding line 46. The double check valves 50 and 52 are set such that the cracking pressure is higher than the back pressure in the return line 39 between the winch operation valve 32 and the hydraulic oil tank 36. A relief valve 54 for regulating the circuit pressure is provided between the discharge pipe 38 and the return pipe 39.

The lorry includes a loading platform moving cylinder 56 for moving the loading platform rearward, and the loading platform moving cylinder 56 is connected to a loading platform operation valve 58. The loading platform operating valve 58 is connected to the hydraulic oil pump 34 by the discharge pipe 38 and is connected to the hydraulic oil tank 36 by the return pipe 39.
The loading and unloading of the load is easily performed by switching the loading platform operating valve 58 to move and tilt the loading platform backward. When loading and unloading cargo on the cargo bed, the cargo vehicle is stopped, the cargo bed operating valve 58 is switched to tilt the cargo bed backward, and then the winch operating valve 32 is switched and driven. The motor 10 is operated. When the driving motor 10 is operated, the hydraulic oil is supplied to the oil chamber 18 of the clutch cylinder 14, the clutch 12 is automatically engaged, and the winch is wound up and down.

When the clutch 12 is disengaged, the winch operation valve 32 is returned to the neutral position, and the manual lever is operated to the disengagement side. The double check valves 50 and 52 are set such that the cracking pressure is higher than the back pressure normally generated in the return line 39 when operating the loading platform moving cylinder 56 or during the warm-up operation at the start of operation in a cold region. Since the clutch 12 is not opened unless a pressure higher than the back pressure of the return pipe 39 is applied, the clutch 12 is not engaged by the back pressure of the return pipe 39 after the clutch 12 is disconnected by the manual lever 30.
JP 2002-46984 A

In the winch device 1 of this lorry, the cracking pressure of the double check valves 50 and 52 is set to a predetermined magnitude. On the other hand, the back pressure generated in the return line 39 changes according to the use conditions such as the discharge amount and the rotation speed of the hydraulic oil pump 34. Therefore, after the clutch 12 is disengaged by the manual lever 30, when the back pressure of the return pipe 39 becomes larger than the cracking pressure of the double check valves 50 and 52, hydraulic oil is supplied to the oil chamber 18 of the clutch cylinder 14 and the clutch 12 may enter, and it is not possible to completely prevent the clutch 12 from entering due to back pressure.
The present invention solves the above problems, and an object of the present invention is to provide a winch device for a truck that can prevent the clutch from being engaged by the back pressure of the return pipe after the clutch is disengaged. It is.

The present invention adopts the following configuration in order to solve the problem. Winch apparatus lorry according to the present invention includes a driving motor for the winch, and a clutch for transmitting power of the driving motor to the winch drum, the clutch cylinder for actuating the clutch input side by a hydraulic, the clutch cylinder a manual lever to be operated to actuate the clutch to the switching side, a winch device lorry comprising a winch operating valve, wherein the clutch cylinder, a spool, disposed on both sides of the spool entry side A switching valve structure comprising an oil chamber and a cut-side oil chamber, an input-side port that opens to the input-side oil chamber, a discharge port that opens to the cut-side oil chamber, and an intermediate port that opens between them It has the discharge port, which is connected to the return line between the winch operating valve return port and the working oil tank, the entering-side port, the winch Connected to the winding line on the valve operating side, the intermediate port is connected to the winding line on the driving motor side, and the inlet oil chamber is connected to the pump port of the winch operation valve via the inlet port. When connected, the spool moves to the end of the cut-off side oil chamber, the clutch operates to the ingress side, the ingress port and the intermediate port communicate with each other, and the ingress oil chamber enters the ingress side. When the clutch is operated to the disengagement side by operating the manual lever while being connected to the return port of the winch operation valve via the side port, the spool moves to the inlet side oil chamber side end. The discharge port and the intermediate port communicate with each other .

In this winch device of a lorry, when the winch operation valve is switched and hydraulic oil is supplied from the winch operation valve to the inlet side oil chamber of the clutch cylinder having the switching valve structure, the clutch automatically enters and the hydraulic oil The winch is wound up and down by being supplied to the driving motor from the oil chamber on the inlet side of the clutch cylinder.
A discharge port for discharging the hydraulic oil from the cut side oil chamber of the clutch cylinder and a return port of the winch operation valve are connected to the same hydraulic oil return line. Therefore, after the clutch is disengaged by the manual lever, the back pressure generated in the return pipe acts on the disengagement side oil chamber of the clutch cylinder through the discharge port of the clutch cylinder. At the same time, the same back pressure acts on the inlet side oil chamber of the clutch cylinder from the return port of the winch operation valve via the winch operation valve. Since the same back pressure is applied to the cut side oil chamber and the input side oil chamber of the clutch cylinder to balance them, it is always prevented that the clutch is engaged even after the back pressure of the return line becomes abnormally high after the clutch is disengaged. .

  Since the present invention is a winch device for a lorry as described above, it is possible to prevent the clutch from being engaged by back pressure generated between the winch operation valve and the hydraulic oil tank after the clutch is disengaged.

The best mode for carrying out the present invention will be described with reference to FIGS. FIG. 1 is a configuration diagram of a hydraulic circuit of a winch device for a truck according to the present invention, FIG. 2 is an explanatory diagram of a clutch cylinder in a disengaged state, and FIG.
This winch device 1 for a lorry includes a drive motor 10, a clutch 12 that transmits the power of the drive motor 10 to a winch drum, a clutch cylinder 14 that has a switching valve structure and operates the clutch 12 on the inlet side, A manual lever 30 for operating the clutch 12 to the disengagement side and a winch operation valve 32 are provided. In the engaged state of the clutch 12, the power of the driving motor 10 is transmitted to the winch drum, and the winch is wound up and down. When the clutch 12 is in the disengaged state, the power of the driving motor 10 is not transmitted to the winch drum, and the wire can be pulled out manually.

The drive motor 10 is connected to the winch operation valve 32 by a winding pipe 40 and a lower pipe 46.
The port 33a of the winch operation valve 32 is a pump port, the port 33a is connected to the hydraulic oil pump 34 by the discharge pipe 38, the port 33b of the winch operation valve 32 is a return port, and the port 33b Is connected to the hydraulic oil tank 36 by a return line 39.
The hoisting line 40 is composed of a hoisting line 42 on the winch operation valve 32 side and a hoisting line 44 on the drive motor 10 side, and between the hoisting line 42 and the hoisting line 44. A clutch cylinder 14 is provided.

  The clutch cylinder 14 has a spool 16, an inlet side oil chamber 20, a cut side oil chamber 22, and ports 24, 26, 28 on both sides of the spool 16. The end of the spool 16 on the inlet side oil chamber 20 side is connected to the manual lever 30, and the end of the spool 16 on the side of the cut side oil chamber 22 is connected to the clutch 12. The port 24 opens to the end of the inlet side oil chamber 20 at the manual lever 30 side, the port 26 opens to the end of the clutch side 12 of the cut side oil chamber 22, the port 28 opens between the port 24 and the port 26, 26 is a discharge port. When the spool 16 moves to the manual lever 30 side end of the inlet side oil chamber 20, the port 26 and port 28 communicate with each other via the cut side oil chamber 22, and the spool 16 moves to the clutch 12 side end of the cut side oil chamber 22. Then, the port 24 and the port 26 are configured to communicate with each other via the inlet-side oil chamber 20. The port 24 is connected to the winch operation valve 32 by a hoist line 42, the port 26 is connected to the driving motor 10 by a hoist line 44, and the port 28 is connected to a return line 39 by a discharge line 48. It is connected to the.

  The cargo vehicle includes a loading platform moving cylinder 56 for moving the loading platform rearward. By switching the loading platform operating valve 58 and tilting the loading platform backward, loading and unloading of the loading platform can be performed. It can be easily configured. A relief valve 54 for regulating the circuit pressure is provided between the discharge line 38 and the return line 39.

Next, the operation will be described.
When loading and unloading a cargo to the loading platform, the cargo vehicle is first stopped at a predetermined location, and the loading platform operating valve 58 is switched to tilt the loading platform backward. When the winch is hoisted, the winch operation valve 32 is switched from the neutral position to the hoist position. The hydraulic oil is supplied from the hoist line 42 to the inlet side oil chamber 20 through the port 24 of the clutch cylinder 14, and the spool 16 is hydraulically connected from the end on the manual lever 30 side of the inlet side oil chamber 20 to the cut side oil chamber 22. It moves to the clutch 12 side end, the clutch 12 is engaged, and the port 24 and the port 28 communicate with each other via the entry side oil chamber 20. When the spool 16 moves to the clutch 12 side end of the cut side oil chamber 22, the hydraulic oil in the cut side oil chamber 22 is discharged from the port 26 through the discharge pipe 48 to the return pipe 39. The hydraulic oil is supplied from the hoisting pipe 44 to the driving motor 10 through the port 28 to actuate the driving motor 10, flows from the lowering pipe 46 to the winch operation valve 32, and the port 33 b of the winch operation valve 32. To the return line 39.

When lowering the winch, the winch operation valve 32 is switched from the winding position to the lowering position. The hydraulic oil is supplied to the driving motor 10 from the lowering pipe 46, operates the driving motor 10, flows from the winding pipe 44 through the port 28 to the inlet side oil chamber 20, and is taken up from the port 24. It flows to the winch operation valve 32 through the pipe line 42, and is discharged from the port 33 b of the winch operation valve 32 to the return pipe line 39.
When the winch has been wound and lowered by the drive motor 10, the manual lever 30 is operated to the cut side to move the spool 16 of the clutch cylinder 14 to the end of the inlet side oil chamber 20 to the manual lever 30 side. Cut off. When the clutch 12 is disengaged, the wire can be manually pulled out of the winch.

When the clutch 12 is disengaged, when a warm-up operation at the start of work in a cold region is performed or when the loading platform moving cylinder 56 is operated, back pressure is generated in the return line 39, and the generated back pressure is operated by the winch operation. It acts on the inlet side oil chamber 20 through the port 33 b of the valve 32, the hoisting line 42 and the port 24 of the clutch cylinder 14. At the same time, the back pressure generated in the return line 39 also acts on the cut-off oil chamber 22 via the discharge line 48 and the port 26 of the clutch cylinder 14. On both sides of the spool 16, back pressure of the same magnitude is applied and balanced from the inlet side oil chamber 20 and the cut side oil chamber 22, and the spool 16 reaches the clutch 12 side end of the cut side oil chamber 22 by the back pressure. It will not move. Therefore, even if a large back pressure is generated in the return pipe 39 after the clutch 12 is disconnected by the manual lever 30, the back pressure does not cause the clutch 12 to be engaged.

It is a block diagram of the hydraulic circuit of the winch apparatus of the lorry concerning the present invention. It is explanatory drawing of the clutch cylinder in a disconnection state. It is explanatory drawing of the clutch cylinder in an on state. It is a block diagram of the hydraulic circuit of the winch apparatus of the conventional lorry.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Winch device 10 Drive motor 12 Clutch 14 Clutch cylinder 16 Spool 20, 22 Oil chamber 24, 26, 28 Port of clutch cylinder 30 Manual lever 32 Winch operation valve 33a, 33b Port of winch operation valve 34 Hydraulic oil pump 36 Hydraulic oil Tank 38 Discharge line 39 Return line 40, 42, 44 Hoist line 46 Lower line 48 Discharge line 54 Relief valve 56 Cargo bed moving cylinder 58 Cargo bed operation valve

Claims (1)

A motor for driving the winch, hydraulic power of the drive motor and the clutch for transmitting the winch drum, the clutch cylinder for actuating the clutch input side by the hydraulic, the clutch switching side by operating the clutch cylinder A winch device for a lorry, comprising a manual lever to be operated and a winch operation valve,
The clutch cylinder includes a spool, an inlet side oil chamber and a cut side oil chamber provided on both sides of the spool, an inlet port opened in the inlet side oil chamber, and a discharge port opened in the cut side oil chamber. And a switching valve structure having an intermediate port opened between them ,
Said exhaust port is connected to the return line between the return port and the working oil tank of the winch operating valve, entering-side port is connected to a hoisting line of the winch operating valve side, said intermediate port , Connected to the winding line on the drive motor side,
When the inlet side oil chamber is connected to the pump port of the winch operation valve via the inlet side port, the spool moves to the end of the cut side oil chamber, and the clutch operates to the inlet side. The ingress port and the intermediate port communicate with each other;
When the manual lever is operated to operate the clutch to the disengagement side with the entry side oil chamber being connected to the return port of the winch operation valve via the entry side port, the spool is moved to the entry side. A winch device for a lorry , wherein the exhaust port and the intermediate port communicate with each other while moving to the oil chamber side end .

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