JPH07292725A - Running lever device of construction machine - Google Patents

Abstract

PURPOSE:To enable a running lever to be locked at desired tilt angle so as to reduce the fatigue of a driver at running for a long distance by pressing the lower end part of a running lever by means of a curved metal fitting connected to a locking cylinder. CONSTITUTION:By tilting a running lever 9 forward from the neutral position, a construction machine starts to advance. When the running lever 9 is tilted at a required running speed, by operating a switch 13 to be ON, a locking cylinder 20 is actuated to extend. Then a curved metal fitting 18 is rotationally moved upward centering around the axis of a pin pivotally supporting the base end part with one end fixed part of a body, and the friction face 19 of the curved metal fitting 18 presses a circular arc-like face part 17 provided on the lower part of the running lever 9. Hereby, the running lever 9 is locked at the desired tilt angle. Thereafter, by operating the switch 13 to be OFF, the locking cylinder 20 is actuated to contract, and hence the running lever 9 is unlocked.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traveling lever device mounted mainly on construction machines such as hydraulic shovels and work vehicles.

[0002]

2. Description of the Related Art FIG. 9 is a perspective view of a main part showing an inside of a driver's cab of a hydraulic excavator (not shown) equipped with a conventional traveling lever device 1. In the figure, 2 is a floor plate of a driver's cab, 3 is a driver's seat, 4L and 4R are left and right operating machine operating levers, and 5L and 5R are left and right traveling levers of the traveling lever device 1. As shown in FIG. 7, in the hydraulic excavator, the driver's seat 3
A pair of left and right traveling levers 5L and 5R are tiltably provided in front of the vehicle, and the hydraulic excavator is moved forward or backward by operating the traveling levers 5L and 5R forward or backward.

[0003]

When the hydraulic excavator travels a long distance, the driver must hold the travel lever at a forward tilt angle corresponding to a required travel speed for a long time. This forward-tilt holding operation of the travel lever causes the driver to reach for an unreasonable posture, which causes fatigue in an early stage, and the forward-tilt holding operation of the travel lever during traveling on a downhill makes the driver's driving posture uncomfortable. It could be stable. An object of the present invention is to provide a traveling lever device that can solve the above problems.

[0004]

In the traveling lever device of the present invention, the traveling lever is provided in the vicinity of the driver's seat so as to be tiltable, and the construction lever is tilted to move the construction machine forward or backward. In the lever device, an arcuate surface portion is provided at a lower portion of the travel lever toward the front and rear and downward with a support shaft center of the travel lever as a center, and a friction surface corresponding to the arcuate surface portion is provided on one end fixing portion of the vehicle body. The curved metal fitting is attached rotatably, while the lock cylinder is arranged near the lower portion of the traveling lever, the rod tip of the lock cylinder is connected to one end of the curved metal fitting, and the switch is operated to By extending the locking cylinder, the friction surface of the curved metal fitting is pressed against the arcuate surface of the lower portion of the traveling lever. Further, the switch is embedded in the grip of the traveling lever, the switch is provided with a short and small lever, and the short and small lever is tilted to perform on / off operation of the switch. Alternatively, between the lower end of the traveling lever and the one end fixing part of the vehicle body, the remote control mounting part is moved by a lock operation to lock and fix the distance from the front end pin hole to the rear end pin hole, and also the unlocking operation. The mechanical locking device that allows the distance to be arbitrarily changed by means of the above is provided.On the other hand, the grip on the upper end of the traveling lever is provided with a short and small lever for tilt switching operation, and the short and small lever,
It is configured by connecting the remote control mounting part of the mechanical lock with a push-pull cable.

[0005]

Operation: When the traveling lever is tilted forward from the neutral position, the construction machine starts to move forward. When the traveling lever is tilted to the required traveling speed, the switch is turned on. As the locking cylinder extends, the curved fitting rotates upward about the pin axis that pivotally supports the base end portion of the vehicle body at one fixed end, and the friction surface of the curved fitting causes the running lever to move. The arcuate surface portion provided at the bottom is pressed. Thereby, the traveling lever can be locked and fixed at a required tilting angle. And when the switch is turned off,
Since the locking cylinder is contracted, the traveling lever can be unlocked. Further, since the short and small levers are provided for the switch of the grip of the traveling lever, the traveling lever can be easily locked with fingers. Further, since it is possible to confirm whether or not the traveling lever is locked and locked by the operating direction of the short and small levers, it is possible to ensure convenience and certainty of operation. Also, with a travel lever device that has a mechanical lock between the lower end of the travel lever and the one end fixed part of the vehicle body, when you want to lock the travel lever during traveling operation, the short lever provided on the grip is tilted to the lock position. Manipulate. By this tilt switching operation, the remote control mounting part of the mechanical locking device is moved via the push-pull cable provided between the short lever and the mechanical locking device, so the mechanical locking device is locked and the mechanical locking device is locked. Fix the distance between the front and rear pin holes of the lock. Therefore, the traveling lever can be locked and fixed at a required tilt angle. When it is desired to release the lock fixing of the traveling lever, the short and small levers are tilted and switched to the lock releasing position. Since the mechanical lock is unlocked via the push-pull cable, the distance between the front end pin hole and the rear end pin hole of the mechanical lock can be arbitrarily changed within a predetermined range. Therefore, the locking of the traveling lever can be released.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a side view of essential parts showing the vicinity of a driver's seat 7 of a hydraulic excavator (not shown) equipped with a travel lever device 6 according to a first embodiment of the present invention. In the figure, 8 is a floor plate, 9 is a pair of left and right travel levers (the travel levers are left and right
There is a book, but for convenience of explanation, it is a single code 9),
Reference numeral 10 is a grip at the upper end of the traveling lever 9, 11 is a pedal fixed integrally with the traveling lever 9, and 12 is a traveling direction switching valve. FIG. 2 is an enlarged view of the traveling lever device 6 in FIG. In the figure, 13 is a switch embedded in the grip 10, 14 is a small lever, 15 is a bracket fixed to the upper surface of the floor plate 8, 16 is a support shaft for the traveling lever 9, and 17 is a circle provided under the traveling lever 9. Arc surface,
18 is a curved metal fitting, 19 is a friction lining fixed to the curved surface side of the curved metal fitting 18, 20 is a lock cylinder, 21 is a built-in spring provided inside the cylinder of the lock cylinder 20, and 22 and 23 are Brackets, 24, 25, and 26, which are provided on one end fixed portions of the vehicle body, are pins. FIG. 3 is a circuit diagram of the traveling lever device 6.
In the figure, 27 is an electromagnetic switching valve, 28 is an electromagnetic switching valve 27.
, 29 is an oil pressure source, 30 is an oil tank, and 31 is a power source. FIG. 4 is a front view seen from A of FIG.
FIG. 5 is a side view of essential parts showing a locked state of the traveling lever 9.

Next, the structure of the traveling lever device 6 according to the first embodiment of the present invention will be described with reference to FIGS. In the present invention, an arcuate surface portion 17 having a radius R is provided below the traveling lever 9 and extends downward in the front-rear direction about the axis 0 of the support shaft 16 of the traveling lever 9, and at the one end fixing portion of the vehicle body. Bracket 2
4, a curved metal fitting 18 having a friction surface corresponding to the arcuate surface portion 17 was rotatably attached by a pin 24. On the other hand, the base end portion of the lock cylinder 20 is connected by a pin 26 to a bracket 23 provided at one end fixing portion of the vehicle body near the lower portion of the traveling lever 9, and the rod tip end portion of the lock cylinder 20 and the above-mentioned curve. The one end of the metal fitting 18 (bracket 32 shown in FIG. 2) is connected by a pin 25, and the lock cylinder 20 is extended by operating the short lever 14 of the switch 13.
The friction surface (referred to as the contact surface of the lining 19) is pressed against the lower surface of the arcuate surface portion 17 below the traveling lever 9.

Next, the operation of the traveling lever device 6 according to the first embodiment of the present invention will be described. For convenience of explanation, the traveling lever 9
The switch 13 provided on the grip 10 is turned off, and the traveling lever 9 is unlocked first. When the traveling lever 9 is tilted forward (in the direction of arrow a) from the neutral position N (shown in FIG. 2), the traveling direction switching valve 12 is switched, so that the hydraulic excavator starts to move forward. When the traveling lever 9 is tilted to the required traveling speed, the short and small lever 14 of the grip 10 is switched in the direction of arrow B (shown in FIG. 2). Since the switch 13 shown in FIG. 3 is turned on, the solenoid 28 is energized and the electromagnetic switching valve 27 is turned on.
Changes from the tank communication oil passage position a to the opening oil passage position b. The pressure oil from the hydraulic pressure source 29 is supplied to the bottom side oil chamber 33 of the lock cylinder 20 through the position b of the electromagnetic switching valve 27. Since the locking cylinder 20 extends,
The curved metal fitting 18 pivots upward around the pin 24 axis of the bracket 22 pivotally supporting the base end thereof, and the friction surface of the lining 19 fixed to the curved metal fitting 18 is located below the traveling lever 9. The lower surface of the arcuate surface portion 17 provided is pressed as shown in FIG. Thereby, the traveling lever 9 can be locked and fixed at a required tilting angle, that is, at an arbitrary stepless angle. When the switch 13 is turned on by operating the short and small lever 14, the solenoid 28 shown in FIG. 3 is de-energized, so that the electromagnetic switching valve 27 returns to the tank communication oil passage position a by the spring force of the built-in spring 34. Since the lock cylinder 20 is contracted by the spring force of the built-in spring 21, the lock fixing of the traveling lever 9 can be solved. In this embodiment, the lock cylinder 20 is extended by hydraulic pressure, but not limited to hydraulic pressure, pneumatic pressure (not shown) may be used.

Next, FIG. 6 is a side view showing a traveling lever device 35 according to a second embodiment of the present invention. In the drawing, the same reference numerals are given to those using the same constituent elements as those of the traveling lever device of the first embodiment. 9'is a traveling lever, 36 is a grip on the upper end of the traveling lever 9 ', 37 is a small lever provided on the grip 36, 38 is a bracket provided at one end fixing portion of the vehicle body, 39 is a pin hole of the bracket 38, 40 Is a pin hole opened at the lower end of the traveling lever 9 ', 41 is a mechanical lock tool, 42 is a remote control mounting portion of the mechanical lock tool 41, 43 and 44 are pins, 45 respectively.
Is a push-pull cable. FIG. 7 is a vertical sectional view in the vicinity of the grip 36 in FIG. In the figure, 4
6 is a fulcrum pin of the small and small lever 37, and 47 is a small and small lever 37.
The cable end mounting portion of the cable S has a dimension S when the short lever 37 is tilt-switched in the direction of arrow C to switch the cable end mounting portion 47.
Is the stroke amount to move.

FIG. 8 shows the mechanical lock device 4 shown in FIG.
It is a detailed view of 1. In the figure, reference numerals 48 and 49 denote front end and rear end pin holes opened in the mechanical lock 41, respectively. In this mechanical lock tool 41, when an unlocking force is applied to the remote control mounting portion 42, the rod 50 linearly moves the inner diameter holes of the pair of left-handed and right-handed coil springs 51L and 51R within a predetermined range. You can move.

Next, the construction of the traveling lever device 35 of the second embodiment of the present invention will be described with reference to FIGS. In the present invention,
Between the lower end portion of the traveling lever 9'and the bracket 38 provided at one end fixing portion of the vehicle body, the remote control mounting portion 42 is moved by the lock operation to move the distance Lx (from the front end pin hole 48 to the rear end pin hole 49). (See FIG. 8) is fixed by a lock, and a mechanical lock tool 41 that allows the distance Lx to be arbitrarily changed by an unlocking operation is provided, while a tilt switching operation is performed on the grip 36 at the upper end of the traveling lever 9 '. A short lever 37 that can be formed is provided, and the short lever 37 and the remote control mounting portion 42 of the mechanical lock 41 are connected by a push-pull cable 45.

Next, the operation of the traveling lever device 35 of the second embodiment of the present invention will be described. According to the present invention, when it is desired to lock the traveling lever 9'during traveling operation, the short and small lever 37 provided on the grip 36 is tilt-switched from the unlocked position D (shown in FIGS. 6 and 7) to the locked position E. By this tilt switching operation, the remote control mounting portion 42 is moved via the push-pull cable 45, so that the mechanical lock device 41 enters a locked state, and the distance between the front end pin hole 48 and the rear end pin hole 49 of the mechanical lock device 41. Lx is fixed. Therefore, the traveling lever 9'can be locked and fixed at a required tilt angle, that is, at any stepless angle. When it is desired to unlock the traveling lever 9 ', the short lever 37 is tilted to the unlock position. Since the mechanical lock device 41 is unlocked via the push-pull cable 45, the front end pin hole 48 of the mechanical lock device 41 is released.
The distance Lx between the rear end pin hole 49 and the rear end pin hole 49 can be arbitrarily changed within a predetermined range. Therefore, the lock fixing of the traveling lever 9'can be released.

[0013]

In the travel lever device of the prior art, when the hydraulic excavator travels for a long distance, the driver extends his or her hand to perform the forward tilting and holding operation of the travel lever in an unreasonable posture. In addition, the driving posture of the driver may become unstable in the forward tilt holding operation of the traveling lever when traveling downhill. However, in the traveling lever device according to the first embodiment of the present invention, when the hydraulic excavator is traveling, when it is desired to tilt and fix the traveling lever at a required traveling speed, the switch is turned on. Since the lock cylinder extends,
The curved metal fitting pivots upward around a pin axis that pivotally supports the base end of the fixed metal fitting on one end of the vehicle body, and the friction surface of the curved metal fitting forms an arc-shaped surface portion provided under the traveling lever. Press. Further, in the traveling lever device according to the second embodiment, when it is desired to lock the traveling lever at the time of traveling operation, the short lever provided on the grip is tilted and switched to the lock position. By this tilt switching operation, the remote control mounting part of the mechanical locking device is moved via the push-pull cable provided between the short lever and the mechanical locking device, so the mechanical locking device is locked and the mechanical locking device is locked. Fix the distance between the front and rear pin holes of the lock. Therefore, in the traveling lever device of the present invention, the traveling lever at the time of traveling operation can be locked and fixed at a required tilt angle, that is, at any stepless angle. Further, in the present invention, since the short lever is provided for the switch of the grip of the traveling lever, the traveling lever can be easily locked with the fingers. Further, since it is possible to confirm whether or not the traveling lever is locked and locked by the operating direction of the short and small levers, it is possible to ensure the convenience and certainty of the operation.

[Brief description of drawings]

FIG. 1 is a side view of essential parts showing the vicinity of a driver's seat equipped with a traveling lever device according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the traveling lever device in FIG.

FIG. 3 is a circuit diagram of the traveling lever device in FIG.

FIG. 4 is a front view seen from A of FIG.

FIG. 5 is a side view of essential parts showing a locked state of the traveling lever in FIG.

FIG. 6 is a side view showing a traveling lever device according to a second embodiment of the present invention.

7 is a vertical sectional view around the grip in FIG.

FIG. 8 is a detailed view of the mechanical lock device shown in FIG.

FIG. 9 is a perspective view of a main part showing an inside of a driver's cab equipped with a traveling lever device according to a conventional technique.

[Explanation of symbols]

 1,6,35 Traveling lever device 3,7 Driver's seat 5L, 5R, 9,9 'Traveling lever 10,36 Grip 13 Switch 14,37 Small and small lever 17 Arc surface 18 Curved metal fitting 20 Locking cylinder 41 Mechanical locking device 42 Remote control mounting part 45 Push-pull cable 48, 49 Front end and rear end pin holes

Claims (3)

[Claims] 1. A travel lever device in which a travel lever is tiltably provided near a driver's seat and a construction machine is moved forward or backward by tilting the travel lever. A travel lever is provided below a travel lever. Extending the arc-shaped surface portion downward in the front and rear around the support axis of
A curved metal fitting having a friction surface corresponding to the above-mentioned arcuate surface portion is rotatably attached to one end fixing portion of the vehicle body, while a lock cylinder is arranged near the lower portion of the traveling lever, and the rod tip portion of the lock cylinder is attached. And the one end portion of the curved metal fitting is connected, and the lock cylinder is extended by a switch operation so that the friction surface of the curved metal fitting is pressed against the arc-shaped surface portion under the traveling lever. A characteristic lever device for construction machinery. 2. A traveling lever device for a construction machine according to claim 1, wherein a switch is embedded in a grip at an upper end of the traveling lever, a short lever is provided in the switch, and the short lever is tilted. A traveling lever device for a construction machine, characterized in that the switch is turned on and off by means of the above. 3. A traveling lever device in which a traveling lever is tiltably provided near a driver's seat and the construction machine is moved forward or backward by tilting the traveling lever. A lower end portion of the traveling lever and a vehicle body. The distance between the front end pin hole and the rear end pin hole is locked and fixed by moving the remote control mounting part with the one end fixing part by locking operation, and the above distance can be arbitrarily changed by the unlocking operation. On the other hand, the mechanical lock is installed, and on the other hand, the grip at the upper end of the traveling lever is provided with a small lever that can be tilted and switched, and the short lever and the remote control mounting part of the mechanical lock are connected by a push-pull cable. A characteristic lever device for construction machinery.