JP4521684B2 - Vehicle equipped with a brake release mechanism - Google Patents

Description

  The present invention relates to a work vehicle for performing a specific work or business, such as an aerial work vehicle, a transport vehicle, a specific industrial vehicle, and the like. The present invention relates to a technique for releasing a brake of a placed vehicle.

  Examples of conventional work vehicles include work vehicles that perform cargo handling such as wheel-type hydraulic excavators and wheel loaders, and high-altitude work vehicles that perform work by placing workers at high places. Such a working vehicle has a parking brake (parking brake, hand brake, etc.) as a brake for self-holding when the vehicle is stopped (parking) or when the engine is stopped.

  For a vehicle that is parked with such a parking brake, if the workers try to move or carry the vehicle, the traveling device of the vehicle must be free. It is necessary to release the parking brake of this vehicle using a hand pump or a dedicated tool.

  FIG. 5 is a schematic view showing a state in which the work vehicle A10 is loaded on the loading platform B11 of the transfer vehicle (truck) B10 for movement or transportation. The side surface portion and / or the rear end surface portion of the loading platform B11 of the transfer vehicle B10 can be opened by being tilted downward for loading luggage or the like. Further, a flat climbing tool for passing the work vehicle A10 to the rear end surface B11 ′ of the loading platform B11, which is the rearmost part of the transfer vehicle B10, for smooth transfer between the vehicle B10 and the ground D. C1 is stretching.

  In FIG. 5, the work vehicle A10 loaded on the loading platform B11 of the transfer vehicle B10 has the parking brake removed and the traveling device is free, and the rope C2 is attached to the work vehicle A10 in the free state. The rope C2 is wound up by the winch C3 at the other end, the work vehicle A10 is moved by the hook C3, and the work vehicle A10 is moved up gradually via the climbing tool C1. To load.

  FIG. 6 is an explanatory diagram showing an example of a configuration for releasing the parking brake in a work vehicle having a conventional parking brake. FIG. 6A is for releasing the parking brake used in the conventional work vehicle. 6 (2) is an explanatory view showing a specific example of the brake release mechanism 83, and FIG. 6 (3) is a circuit component for releasing the brake. It is a disassembled perspective view for demonstrating the relationship between the wheel 80 of a certain wheel, the rod locking disc 81, the hydraulic cylinder 86, the axle 82, and the like.

  First, a circuit configuration for releasing a parking brake in a conventional vehicle will be described with reference to FIGS. The work vehicle here has a wheel (80, 80 ') which is a wheel and an axle 82 which fixes the center of rotation of both wheels, and on this axle 82, a wheel 80 and a concentric disc-shaped rod. The locking disc 81 is integrally fixed, and the members of the foil (80, 80 '), the rod locking disc 81 and the axle 82 are integrally coupled, and the same is set with the axle 82 as an axis. Turn or rotate.

  The brake cylinder 86 is a piston that can repeatedly project and retreat by raising and lowering the pressure (hydraulic pressure) of the oil introduced through the oil passage 87 with respect to the spring body 86 ″ enclosed therein. It has a cylinder rod portion 86 'of the mold. The cylinder rod portion 86 ′ has a large number of recesses 81 provided to open to the circumferential end side of the rod locking disc 81 when the oil pressure is lowered through the oil passage 87 and the rod portion protrudes. It is set so that it is locked at any position of ', the locked state of both is maintained, and the parking brake is applied.

  FIG. 6 (1) is based on a conventional parking brake circuit mechanism, and the cylinder rod portion 86 ′ of the brake cylinder 86 protrudes and is engaged with a recess 81 ′ on the outer periphery of the disc 81, and the parking brake is applied. It is the figure which showed the state. Since the rotation of the rod locking disk 81 is stopped by the protrusion of the cylinder rod portion 86 ′, the wheel (80, 80 ′) and the axle 82 which are coupled and coupled integrally therewith Both indicate that they are in a state in which they cannot rotate.

  6 (1), the brake release mechanism 83 for releasing the parking brake adjusts the hydraulic pressure flowing in the connected oil passages (87'-87) to adjust the cylinder rod in the piston cylinder 86. In order to project and retract the portion 86 ′, a flow rate adjusting valve 84 and a brake releasing pump 85 are provided, and these components are installed in parallel to the oil passages (87, 87 ′). ing.

  FIG. 6 (2) is a device diagram showing a specific example of the parking brake release mechanism 83 of FIG. 6 (1). According to the conventional brake releasing method, the flow adjusting valve 84 is first closed by turning the handle 84a of the flow adjusting valve 84, and then the hand pump portion 85a of the brake releasing pump 85 until the parking brake is released. This is a mechanism for releasing the parking brake by continuously pushing down to increase the hydraulic pressure and retracting the cylinder rod portion 86 ′ downward in the drawing to release it from the binding of the rod locking disk 81.

And as a prior art document regarding the technique of canceling | releasing the parking brake of a working vehicle, there exist the following, for example.
JP 08-2402 JP 2002-79931 A

However, when releasing the parking brake by the conventional circuit mechanism as described above, in a vehicle equipped with a hand pump as shown in FIG. 6, a considerable amount of time and effort is spent on driving the hand pump. There are difficulties in workability and cost.
In addition, there are some vehicles that cannot be released without using the dedicated tool attached to the work vehicle to release the parking brake. There is an inconvenience that cannot be done.
And about what was described in the above-mentioned conventional patent document, there exists a problem that a cancellation | release mechanism is complicated and leads to the enlargement of a brake cancellation | release mechanism and a cost burden.

  The present invention has been made in view of the conventional problems relating to brake release, which makes it easier to perform the labor-intensive work for releasing the parking brake so far, It is an object of the present invention to provide a vehicle having a brake release mechanism that greatly improves the transport efficiency and that the release mechanism is simple and does not cost much.

(1) A vehicle equipped with the brake release mechanism of the present invention is
A vehicle comprising a wheel 10, a parking brake PB, a valve device 30 for releasing the parking brake PB, a hydraulic pressure supply device 60, oil supply pipes (62, 63, 64), and a main control device 70,
The valve device 30 includes a simple open / close type stop valve 31 and a check valve 32 that opens and closes according to a pressure difference in order to adjust the supply of oil,
A stop valve 31 and a check valve 32 are connected in parallel through the pipe lines (63, 64) to the parking brake PB.
When applying the parking brake PB, the parking brake PB is operated by opening the stop valve 31 and lowering the hydraulic pressure,
Thereafter, when the free wheel is to be used, the stop valve 31 is closed and the hydraulic pressure supply device 60 is driven via the main controller 70 to supply hydraulic pressure to the parking brake PB and release the parking brake PB. Constitute.

(2) In a vehicle having the brake release mechanism of (1),
By stopping the hydraulic pressure supply device 60 via the main controller 70 and stopping the supply of hydraulic pressure to the parking brake PB, a pressure difference is generated between the parking brake PB side and the hydraulic pressure supply device 60 side, and the check valve 32 is closed. And the release of the parking brake is held.

  A vehicle equipped with a brake release mechanism according to the present invention requires a lot of time and effort to release the parking brake as in the past. As a result, it is possible to improve the mobility and transportation efficiency of vehicles that are stopped with the parking brake applied, and the brake release mechanism is simple. There is an excellent effect that it does not lead to cost burden.

  Next, an embodiment of a vehicle including a brake release mechanism according to the present invention will be described in detail with reference to FIGS. 1 and 2 to 4. FIG. 1 is an example of a basic configuration diagram of a vehicle including a parking brake release mechanism according to the present invention. 2 to 4 are diagrams for explaining the operation of the parking brake release mechanism including the hydraulic system circuit in a vehicle including the parking brake release mechanism according to the present invention, in which FIG. FIG. 3 shows a state before running, that is, a state during running, FIG. 3 shows a state where the parking brake is applied and the vehicle is stopped, and FIG. 4 shows a state where the parking brake is released and held. In these FIGS. 2 to 4, a large number of pipelines for supplying oil are described. Among these pipelines, the pipelines used for hydraulic supply are indicated by thicker pipelines. As shown separately.

  First, FIG. 1 shows a parking brake releasing mechanism 100 as an example of a basic configuration diagram in a vehicle including a parking brake releasing mechanism according to the present invention. The parking brake releasing mechanism 100 here applies the parking brake by stopping the rotation of the vehicle wheel by projecting the wheel 10-axle 12-rod locking disk 14 and rod portion 24 on the side where the parking brake of the vehicle is applied. Brake cylinder 20, parking brake release valve device 30, main control device 70 including operation lever 50 / mechanism control device 51 / control valve unit 40, hydraulic supply device 60, oil supply pipelines (62, 63 64).

  In FIG. 1, the brake cylinder 20 is directly operated for releasing the brake, and the braking force of the parking brake can be directly applied to the vehicle wheel 10. The brake cylinder 20 is a single-acting cylinder with a built-in spring body (elastic body), and has a piston 22, a spring body 21, an oil chamber 23, and a cylinder rod portion 24 as constituent elements. Then, oil is sent from the hydraulic oil tank of the hydraulic supply device 60 via a hydraulic pump, and the hydraulic supply device 60 -pipe 62 -main control device 70 (control valve unit 40) -pipe 63 -valve device 30- The increased hydraulic pressure is finally supplied into the oil chamber 23 of the brake cylinder 20 via the pipe line 64-the brake cylinder 20.

  The spring body 21 of the brake cylinder 20 always has an urging force for moving the piston 22 to the left in FIG. 1, which is the braking direction, so that oil can be introduced into the oil chamber 23 through the pipe 64 at a high pressure. When supplied, the piston 22 is moved to the right in FIG. 1 by applying a force in the non-braking direction against the urging force of the spring body 21, and as a result, connected to the piston 22. The rod portion 24 is moved to the right in FIG. Since FIG. 1 shows a state before the parking brake of the vehicle is applied, that is, a traveling state, the rod portion 24 of the brake cylinder 20 is retracted and retracted. 14 is not locked or engaged.

  The valve device 30 applied to the present invention is a device used to release the brake cylinder 20 and is connected in series with a hydraulic pipe 64 and a pipe 63 that are connected back and forth. . The valve device 30 includes a stop valve 31 that performs simple opening and closing and a check valve 32 that opens and closes in response to a pressure difference as two types of valves that are arranged in parallel inside. , And the flow can be adjusted.

  The control of the valve device 30 including the opening / closing operation of the stop valve 31 is configured so that the operator can manually control using the operation lever 50 shown in FIG. Thus, it can be automatically controlled by means for sending an operation signal such as valve opening / closing to the mechanism control device 51. The check valve 32 can be automatically opened and closed by using a valve set to open and close with an appropriate pressure difference.

  In the parking brake release mechanism 100 of the present invention shown in FIG. 1, the main control device 70 for controlling the parking brake release mechanism includes an operation lever (vehicle travel lever) 50 / mechanism control device 51 / control valve unit 40. FIG. 1 shows a configuration example in which the operator can manually operate the parking brake release mechanism by means of the operation lever 50 and the stop valve 31. The operation lever 50 sets two switching states of “ON (forward or reverse)” and “OFF (neutral)”, and the stop valve 31 controls the flow of oil from “fully open” to “fully closed”.

(1) When the vehicle travels normally In the parking brake release mechanism 100 according to the present invention shown in FIG. 1, a hydraulic pressure supply device 60 including a hydraulic pump for applying hydraulic pressure, an electromagnetic switching valve that operates by energizing the solenoid to switch the pipeline. And a mechanism control device 51 for controlling the control valve unit 40.
Normally, when the stop valve 31 is set to “fully open” and the operation lever 50 is set to “ON”, the control valve unit 40 in the main controller 70 switches the pipeline by the electromagnetic switching valve, and the parking brake PB. The operating pressure (P) is accumulated in the piston 22 of the brake cylinder 20, and the piston 22 and the cylinder rod 24 are in a position close to the right side in FIG. The vehicle is ready to run.

(2) When the vehicle is parked When the operation lever 50 is set to “OFF (neutral)”, the pipe is switched by the electromagnetic switching valve in the control valve section 40 and the stop valve 31 is opened, so that the parking brake Since the accumulated pressure of the operating pressure (P) of the piston 22 of the PB is released, the piston 22 and the cylinder rod 24 of the parking brake PB have moved to the left side in FIG. 1, and the cylinder rod 24 has moved to the rod locking disc 14. As a result, the two cannot move relative to each other, and the parking brake is activated.

(3) In case of freewheeling When the operation lever 50 of the vehicle is set to “ON (forward or reverse)” with the stop valve 31 being “fully closed”, the electromagnetic switching in the control valve unit 40 from the hydraulic pressure supply device 60 is performed. By applying hydraulic pressure (P) to the parking brake PB through the valve, the piston 22 of the parking brake PB moves to the right in FIG. 1 to release (release) the parking brake. When the vehicle operating lever 50 is set to “OFF (neutral)” in this state, when the hydraulic pressure supply device 60 is stopped via the main control device 70 and the supply of hydraulic pressure to the parking brake PB is cut off, the parking is started. The check valve 32 is closed due to the pressure difference between the brake side and the hydraulic pressure source side, and the release of the parking brake is maintained (maintained) and becomes freewheel.

  Next, the operation of the parking brake release mechanism including the hydraulic system circuit in the vehicle including the parking brake release mechanism according to the present invention will be described in more detail with reference to FIGS. The parking brake release mechanisms (100a, 100b, 100c) in FIGS. 2 to 4 are basically the same as the parking brake release mechanism 100 in FIG. Will be described, but the description of the overlapping configuration will be omitted.

The parking brake release mechanism 100a shown in FIG. 2 is an explanatory diagram of a state before the parking brake of the vehicle is applied, that is, a state in which the vehicle is running. “On (forward or reverse)”.
In FIG. 2, a parking brake release mechanism 100a according to the present invention protrudes from a vehicle (10-10 ')-axle 12-rod locking disc 14 and rod portion 24 on the side where the parking brake of the vehicle is applied. The brake cylinder 20 for stopping the rotation of the vehicle and applying the parking brake, the valve device 30 for releasing the parking brake, the control valve unit 40 in the main control device 70, the hydraulic supply device 60 (the hydraulic oil tank 60a, the hydraulic pump 60b, An electric motor 60c) and oil supply pipes (62, 63, 64, 65, 66, 67) are provided.

  In the parking brake release mechanism 100a of FIG. 2, the hydraulic oil is sent from the hydraulic oil tank 60a of the vehicle hydraulic pressure supply device 60 via the hydraulic pump 60b and circulated in the mechanism. As shown, hydraulic oil tank 60a-hydraulic pump 60b-pipe 62-control valve section 40 in main controller 70-pipe 63-valve device 30-pipe 64-brake cylinder 20 Ultimately, the increased hydraulic pressure is supplied into the oil chamber 23 of the brake cylinder 20.

  In FIG. 2, the main controller 70 (see FIG. 1) includes, as the control valve unit 40, electromagnetic switching type valves such as a function switching valve 41, a sequence valve 42, and a forward / reverse switching valve 43. The control device 51 (see FIG. 1) can control the oil pressure supply by switching the oil passage and pressure of the oil supplied from the oil pressure supply device 60 through the pipelines (62, 66, 63, 65, etc.). In the control valve unit 40, the main control device 70 performs function switching between the parking brake and the traveling motor side and the other actuator side by the function switching valve 41, and the sequence valve 42 is used to secure the opening pressure of the parking brake. The forward / reverse switching valve 43 is used for switching the hydraulic pressure to the traveling motor side and performs various controls.

  The parking brake release mechanism 100a in FIG. 2 is in a state in which the operator sets the operation lever of the vehicle to “ON (forward or reverse)”, that is, when the vehicle travels when the travel signal of the main controller 70 is “ON”. The stop valve 31 of the valve device 30 is open and serves as an oil passage (oil passage). The hydraulic pressure required here is sent via the hydraulic pump 60b, and the hydraulic oil tank 60a-hydraulic pump 60b-pipe 62-control valve unit 40 (function switching valve 41-pipe 66) -pipe 63-valve device 30. -Pipe line 64-Via the brake cylinder 20, finally, the increased hydraulic pressure is supplied into the oil chamber 23 of the brake cylinder 20. Since FIG. 1 shows a state when the vehicle is traveling, high hydraulic pressure is also supplied to the traveling motor side via the sequence valve 42-forward / reverse switching valve 43-pipe 65.

FIG. 3 is a configuration diagram of a parking brake mechanism 100b including a hydraulic system circuit in a vehicle in a state where the parking brake is on and stopped.
In the vehicle of the present invention, when the operator wants to apply the parking brake PB to the vehicle during normal vehicle use (running), the operation lever may be set to “OFF (neutral)”. The stop valve 31 is opened, and the hydraulic pressure in the brake cylinder 20 is sent to the pipe line 64—the stop valve 31—the pipe line 63—the pipe line 67 of the control valve unit 40—the hydraulic oil tank 60a. When the hydraulic pressure is reduced and the piston 22 is moved upward in FIG. 3, the cylinder rod 24 and the rod locking disc 14 are locked or engaged with each other, and cannot move to each other. Apply the braking force to operate. Note that the sequence valve 42 in FIG. 3 is used for securing the parking brake release pressure.

Next, FIG. 4 is a configuration diagram of a parking brake mechanism including a hydraulic circuit in a vehicle in a state where the parking brake is released and is held.
When the vehicle with the parking brake applied in the state of the parking brake release mechanism 100b shown in FIG. 3 is desired to be transported or moved, the operator wants to make the wheel of the vehicle freewheel. . For this purpose, the operator sets the stop valve 31 in the parking brake release mechanism 30 to “fully closed” and sets the operation lever to “ON”. Then, oil is sent from the hydraulic oil tank 60a via the hydraulic pump 60b, the hydraulic pressure in the brake cylinder 20 is supplied, the rod portion 24 moves backward in the figure, and the parking brake PB is released.

  Further, when it is desired to maintain the release of the parking brake, the operator returns the operation lever of the vehicle to “neutral (off)”, stops the hydraulic pressure supply device 60 via the main control device 70, and stops the parking brake PB. Cut off the hydraulic pressure supply. That is, when the supply of hydraulic pressure is cut off, the check valve 32 is closed due to the pressure difference between the parking brake side and the hydraulic pressure source, and the release of the parking brake is held (maintained).

  As for the vehicle having the brake release mechanism of the present invention, the operator manually controls the oil flow using the stop valve 31 as described with reference to FIGS. The structure has been mainly described in which the brake control is controlled by issuing a command to the control valve unit 40 from the mechanism control device 51. However, the present invention is not limited to this, and the brake release mechanism of the present invention is controlled by automatically operating the main controller 70 and the stop valve 31 by appropriately applying another means such as a radio signal, button operation, or switch. This is very easy for a person skilled in the art.

  A vehicle equipped with a brake release mechanism according to the present invention is more easily applied to a parking brake in a field using a work vehicle for performing a specific work or business such as an aerial work vehicle, a transport vehicle, or a specific industrial vehicle. It can be applied as a mechanism for releasing, and it is easy to hold the release of the parking brake, and its applicability is very large in an industry using a vehicle that requires a free wheel.

1 is a schematic diagram of a basic configuration showing an example of a brake release mechanism in a vehicle including a brake release mechanism according to the present invention. FIG. 5 is a configuration diagram of a parking brake mechanism including a hydraulic system circuit during vehicle travel (when a travel signal is input) in a vehicle including a brake release mechanism according to the present invention. 1 is a configuration diagram of a parking brake mechanism including a hydraulic circuit when a vehicle parking brake is ON in a vehicle including a brake release mechanism according to the present invention. 1 is a configuration diagram of a parking brake mechanism including a hydraulic circuit when a vehicle parking brake is released (held) in a vehicle including a brake releasing mechanism according to the present invention. It is a general-view figure which shows the condition when loading work vehicle A10 on the loading platform B11 of the vehicle B10 for transfer. It is explanatory drawing which shows the structural member for canceling | releasing a parking brake in the work vehicle provided with the conventional parking brake.

Explanation of symbols

10, 10 'Vehicle wheel 12 Axle 14 Rod locking disc PB Parking brake 20 Brake cylinder 21 Spring 22 Piston 23 Oil chamber 24 Cylinder rod 30 Valve device (parking brake release device)
31 Stop valve 32 Check valve 70 Main control device 50 Operation lever 51 Mechanism control device 40 Control valve unit 41, 42, 43 Electromagnetic switching valve 60 Hydraulic supply device 60a Hydraulic oil tank 60b Hydraulic pump 60c Electric motor 62, 63, 64, 65, 66, 67 Pipe line (oil path)
100, 100a, 100b, 100c Parking brake release mechanism

Claims (1)

A vehicle comprising a wheel, a parking brake, a valve device for releasing the parking brake, a hydraulic pressure supply device, an oil supply pipeline and a main control device,
The valve device has a simple open / close type stop valve and a check valve that opens and closes according to a pressure difference in order to adjust the supply of oil ,
The previous SL stop valve and said check valve are arranged in parallel, is connected to the parking brake through the oil supply pipe,
When driving the vehicle, the parking brake is released by opening the stop valve, driving the hydraulic pressure supply device via the main control device to increase the hydraulic pressure,
Wherein when applying the parking brake by lowering the oil pressure is stopped the hydraulic pressure supply device in a state of being open the stop valve, it actuates the parking brake,
If you full Rihoiru, after the hydraulic pressure supply to the stop the parking brake by Rukoto valve closes the temporarily driven the oil pressure supply device is limited only to the said check valve, said hydraulic pressure supply device The supply of the hydraulic pressure is cut off by stopping, the check valve is closed by the pressure difference between the parking brake side and the hydraulic pressure supply device side to maintain a high hydraulic pressure, thereby maintaining the release state of the parking brake .
A vehicle provided with a brake release mechanism.

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