JPH018600Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is designed to operate a swivel base that is mounted on a machine base so as to be able to freely rotate around a vertical axis, in order to prevent the swivel base from turning unexpectedly when parking a work vehicle, etc. a device for locking the lever in the rotation stop operation position;
The present invention relates to an operating structure for a working vehicle, including a brake that brakes the turning of the turning base.

The conventional operating structure for operators is to provide a pin hole on the machine base, a pin hole on the swivel base, a pin that can be inserted freely across both pin holes, and a pin hole that can be inserted into the pin hole. A device that detects insertion and an actuator that locks the swing operation lever based on the detection are provided to prevent the pin from turning unexpectedly due to oil leakage from the hydraulic motor or control valve used as the swing drive device. There is a known device that prevents jamming and at the same time automatically locks the turning operation lever (see, for example, Japanese Utility Model Application Publication No. 55-31825).

The problems that the present invention attempts to solve are the improvement of operability and the forgetting of operations. In the above-mentioned conventional configuration, it is essential to insert the pin and accurately align the pin holes prior to this in order to prevent rotation and lock the lever. At the time, when parking on a slope, the swivel base would rotate under its own weight, which was extremely dangerous. Additionally, pilots sometimes leave the aircraft temporarily with the engine running, which can be dangerous if force is accidentally applied to the lever from outside the aircraft.

The present invention provides an operation structure for a work vehicle in which the rotation of the swivel base is always prevented when the operator leaves the machine, and the swivel control lever is also locked at the same time, and can be easily released when resuming work. purpose.

The structural feature of the present invention for achieving the above object is that the brake is biased toward braking, and the lock device is an engaged member that is interlocked with the operation of the operating lever. and a stopper member that is urged to move toward engagement and abut against the engaged member, and engages with the engaged member when the operating lever is operated to a rotation stop position. The footrest pedal is provided with an engaging portion formed on the stopper member for locking the operation lever when the footrest is depressed, and when the footrest is depressed, the stopper member is moved away in a disengagement direction against a biasing force toward the engagement side. The present invention is characterized in that an interlocking mechanism is provided for switching the brake to a non-braking state by resisting the biasing force toward the braking side when the foot pedal is depressed, and this characteristic configuration provides the following effects. It will be done.

That is, since the present invention is constructed as described above, when the operator depresses and operates the foot pedal, the turning operation lever is unlocked and the brake for preventing turning operation is switched to a non-braking state. , the swivel base can be driven and rotated freely. When the operator leaves the aircraft, the foot pedal is no longer pressed, so the stopper member is moved to the engagement position by its biasing force, automatically locking the control lever and releasing the biased brake. The rotation of the swivel base is automatically prevented by this. Therefore, according to the configuration of the present invention, the swivel base is always braked and the lever is locked when the pilot leaves the aircraft, regardless of whether the pilot is conscious or not, so there is no danger of forgetting to do so, and there is no danger of forgetting to turn the pin. Troublesome operations such as hole alignment are also unnecessary. In addition, since the swivel base can be driven and rotated simply by pressing the pedal, it is easy to resume work.

Next, embodiments of the present invention will be described in detail based on illustrative drawings.

As shown in FIG. 1, a swivel base 2 is attached to a machine base equipped with a crawler traveling device 1 so as to be freely driven and rotated around a vertical axis P by a hydraulic swivel motor 3.
The swivel base 2 is provided with an operation cabin 4 and a rear driving unit 5, and a backhoe device 6 that can freely swing up and down and bend/stretch drive is installed on the front edge of the swivel base 2.
It is connected via a base bracket 7 with a hydraulic cylinder 8 so that it can be swung left and right, and a dozer device 9 that can be swung up and down is attached to the front end of the machine base, and is mainly used for ground excavation and earth removal work. It is configured as a work vehicle.

Inside the driving cabin 4, there are left and right traveling devices 1.
A pair of steering levers 23 are provided for driving and operating each of the buckets separately, and a swinging operation for the boom 6a and the bucket 6c of the bucket hoist 6 can be selectively performed with a single lever by cross operation. Similarly to the first operating lever 24, the backhoe device 6 can be swung horizontally by the swing operation of the arm 6b of the backhoe device 6, the swivel operation of the swivel base 2, or the operation of the flow path switching valve 12, which will be described later. A second operating lever 25 is provided which allows the user to perform an alternative operation.

In configuring the drive operation structure for driving and turning the swivel base 2 or driving the backhoe device 6 to swing left and right by the second operation lever 25, a second operation lever 25 is used.
As shown in the figure, the engine 10 in the driving unit 5
The hydraulic cylinder 8 for horizontal swinging of the backhoe device 6 and the swing motor 3 can be selectively connected to the hydraulic pump 11 for driving the work equipment directly connected to the pump 11 by switching the two-position flow path switching valve 12. The hydraulic cylinder 8 or the swing motor 3 is connected in parallel with the pressure oil piping 13 so that the pressure oil is supplied from the flow path switching valve 12 and the hydraulic pump 11. A three-position control valve 14 for switching and stopping operation is provided, and the three-position control valve 14 and a second operation lever 25 are interlocked and connected via a push/pull rod 26, so that the second operation can be performed. By operating the lever 25 in one direction, the backhoe device 6 can be swung left and right and the swivel base 2 can be driven to rotate.

To interlock and connect the second operating lever 25 and the push/pull rod 26, the link mechanism 2 is operated by swinging the second operating lever 25 about the longitudinal axis _Q1 .
The cylindrical shaft 28, which is rotated through the support shaft 29
An arm 28a connected to the cylinder shaft 28 is pivotally connected to the push/pull rod 26, and a protruding engaged member 28b connected to the cylinder shaft 28. A plate-shaped stopper member 30 having a hole-shaped engaging portion 30a that engages with the cylindrical shaft 28 to lock the rotation of the cylindrical shaft 28 at the stop position of the swivel base 2 of the second operation lever 25 is attached to the horizontal shaft at the lower end of the plate-shaped stopper member 30. It can swing freely around the core, and the cylinder shaft 2 is always supported by the spring 31.
8 is provided in a state biased towards the lock side, and is connected with an arm portion 32a that acts in contact with the upper end of the stopper member 30 and operates the stopper member 30 to the cylinder shaft 28 lock release side against the spring 31. A footrest pedal 32 for release is provided on the step inside the cabin 4, and when the swivel base 2 is not rotating and the backhoe device 6 is not swinging, the stopper member 30 closes the second operation lever 25. Arm 6 around left-right axis _Q2 of
b The second operating lever prevents swinging around the longitudinal axis _Q1 while allowing swinging for operation, and when driving the swivel base 2 to swing or drive the backhoe device 6 to swing. By depressing and operating the pedal 32 prior to the operation of the second operating lever 25, the swinging operation of the second operating lever 25 with respect to the swing drive control valve 14 for the swivel base 2 and the backhoe device 6 is allowed, thereby preventing erroneous operation of the second operating lever 25. It is constructed to prevent unexpected operation of the swivel base 2 or the backhoe device 6 due to this.

In addition, 33 in the figure is the arm 6 of the backhoe device 6.
b is a control valve for swing operation, and 15 in the figure is
If the swivel base 2 comes into contact with another object while driving the swivel,
The hydraulic pressure in the swing motor 3 system oil passage, which increases due to the contact reaction force, is detected, and the pilot pressure automatically returns the hydraulic oil to the hydraulic oil tank 16 to control the rotation speed of the swing motor 3. It is a pilot pressure automatic brake valve that lowers or stops the brake.
It is attached to the swing motor 3 main body.

To explain the braking structure of the swivel base 2 for preventing the swivel base 2 from unexpectedly turning when parking a work vehicle, etc., the drive shaft 3a of the swivel motor 3
A sliding friction plate type negative brake 17 which is constantly biased toward the braking action side by an internal spring 17a is attached to the negative brake, and the negative brake 17 is operated to release the brake to the non-action state side against the biasing force of the spring 17a. The cylinder portion 17b is connected to the hydraulic pump 1 for driving the working device.
1, the backhoe device is connected to the backhoe device by the pressure oil piping 20, which has a one-way valve 18 that allows only the flow of pressure oil toward the cylinder portion 17b side, and a two-position switching valve 19 on the downstream side of the one-way valve 18. 6 Connect in parallel with the hydraulic cylinder 8 for left-right swinging and the pressure oil pipe 13 that supplies pressure oil to the swing motor 3, and then operate the switching valve 19 to supply pressure oil to the negative brake cylinder part 17b. Brake 1
7 to a non-operating state to allow rotational drive of the swing motor 3, or the pressure oil in the cylinder portion 17b is discharged to the tank oil path 22 side via the switching valve 19, and the biasing force of the spring 17a is used to The brake 17 is configured to be in a braking state to prevent non-driven rotation of the swing motor 3.

In order to configure the operating structure for the switching valve 19 for operating the negative brake 17, the spool portion of the switching valve 19 is always biased toward the braking operation state of the negative brake 17 by a spring 34, and the switching valve 19 for operating the negative brake 17 is Stopper member 30 release operation pedal 32 and switching valve 1
9 spool part are interlocked and connected by a wire 35, and when the swivel base 2 is driven to rotate, the wire 35 is pulled when the pedal 32 is depressed to the unlocking side of the second operating lever 25. , the switching valve 1 resists the spring 34.
9 to automatically deactivate the negative brake 17, and when the second operating lever 25 is locked by the stopper member 30 when the swivel base 2 is not driven, the wire 35 is loosened and the spring is Due to the biasing action of 34, the switching valve 19
The negative brake 17 is automatically operated to the braking operation state side.

In other words, the operation of the negative brake 17 is
By interlocking with the locking operation of the operating lever 25, the number of operations for fixing or unfixing the swivel base 2 is reduced, the operability is improved, and forgetting or erroneous operation of the negative brake 17 is prevented. It is designed to reliably prevent this.

In addition, the lever 25 for rotating the swivel base 2
The specific structure for locking at the rotation stop position and its operation structure can be modified in various ways.

To configure the negative brake 17 for fixing the rotation of the swivel base 2, it is possible to apply various conventionally known brake structures and their operating structures such as a mechanically operated type or an electrically operated type instead of a hydraulically operated type. , and its negative brake 17
The operation unit 19 and the locking device 30 can be interlocked by a mechanical interlocking mechanism such as a wire, a hydraulic interlocking mechanism, etc.
Various types of interlocking mechanisms 35 and 19, such as electrical interlocking mechanisms, can be applied.

The operating structure according to the present invention can be applied to various types of work vehicles such as construction, agricultural, and transportation vehicles.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

The drawings illustrate an embodiment of the operating structure for a working vehicle according to the present invention, and FIG. 1 is an overall side view of the working vehicle, and FIG. 2 is a schematic diagram showing the operating structure. 2...Swivel base, 17...Brake, 25...Swivel operation lever, 28b...Engaged member, 30...
Stopper member, 30a... Engaging portion, 32... Footrest pedal, 35, 19... Interlocking mechanism, P... Vertical axis center.

Claims (1)

[Scope of utility model registration request] It is equipped with a device for locking a swing operation lever 25 of a swivel base 2 mounted on a machine base so as to be freely swiveling around a vertical axis P at a swing stop operation position, and a brake 17 for braking the swing of the swivel base 2. In the operating structure for a work vehicle, the brake 17 is biased toward the braking side, and the locking device is moved toward the engaged member 28b that is interlocked with the operation of the operating lever 25. and a stopper member 30 that is biased and brought into contact with the engaged member 28b, and when the operating lever 25 is operated to the rotation stop position, it engages with the engaged member 28b and A foot rest in which an engaging portion 30a for locking the operating lever 25 is formed on the stopper member 30, and when the foot is depressed, the stopper member 30 is moved away in the disengagement direction against the biasing force toward the engagement side. A linkage mechanism 35,1 is provided with a pedal 32, and switches the brake 17 to a non-braking state against the biasing force toward the braking side by depressing the foot pedal 32.
An operating structure for a work vehicle characterized by the provision of 9.