JP2001254399A - Traveling lever device for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traveling lever device capable of facilitating operation, reducing the price of the device and a scale in the case of fixing a traveling lever in an inclined attitude for reducing burden on an operator in long-distance traveling in construction machine such as an oil hydraulic shovel. SOLUTION: Attitude holding devices 8 and 9 each for holding the attitude of a traveling lever 3 approximately in a forefront inclined attitude and backmost inclined attitude are provided between the traveling lever 3 and an operation room floor 2. The attitude holding devices 8 and 9 comprise a holding means to use a spring force or magnetic force to hold the attitude of the traveling lever 3 close to the forefront inclined attitude and backmost inclined attitude against the restoring force of the traveling lever 3 to a neutral location. The holding force is set weaker than the operating force by an operator. It is possible to fix the traveling lever 3 and release it from fixation in an inclined attitude only by the operation of the traveling lever 3 or a pedal 5.

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 installed in a cab of a construction machine such as a hydraulic excavator.

[0002]

2. Description of the Related Art In order to carry out landing work in a harbor using a hydraulic shovel, when moving from landing work of one ship to landing work of another ship, the hydraulic shovel is moved by self-propelled operation.
In this case, it is often necessary to travel a long distance. In the case of this traveling movement, the operator holds the grip portion at the top of the traveling lever and keeps the traveling lever down while maintaining the posture while moving straight. However, it is a burden for the operator to travel while maintaining the operation state of the traveling lever in this way.

[0003] In order to reduce the burden on the operator during such long-distance traveling, the operator can travel even if he releases his hand from the traveling lever.
In Japanese Patent Publication No. 98, a fan-shaped tooth plate interlocking with the rotation of the travel lever is provided integrally with a lower portion of the travel lever, and a link having an engagement protrusion that can be disengaged from the teeth of the fan-shaped tooth plate is provided. A switch is provided to be driven by a control motor, and a switch for controlling the drive of the control motor is provided at the top of the travel lever, and the operator operates the switch to control the control motor, whereby the engagement is controlled. There is disclosed a configuration in which a projection is engaged with and disengaged from a tooth of a fan-shaped tooth plate to lock or unlock a traveling lever.

In Japanese Unexamined Patent Publication No. 7-292725, an arc-shaped surface portion is integrally provided at a lower portion of the traveling lever so as to interlock with the traveling lever, and a curved metal fitting is provided so as to face the arc-shaped surface portion. It has been proposed that an operator performs a switch operation and presses the curved metal fitting against the arc-shaped surface portion by a hydraulic cylinder so that the traveling lever is fixed, and the operator can travel even when the hand is released from the traveling lever. I have.

[0005]

According to the configurations described in the above publications, when the traveling lever is fixed in the inclined position for long-distance traveling, the actuator is actuated by operating a switch to operate the locking device. Alternatively, it is necessary to fix and release the traveling lever by canceling the operation, and there is a problem that the switching operation is complicated. Further, in each case, an actuator such as a motor or a hydraulic cylinder is required, so that there is a problem that the apparatus price is increased and the apparatus scale is increased.

In view of the above problems, the present invention requires a switch operation in a construction machine such as a hydraulic shovel when the traveling lever is fixed in an inclined posture in order to reduce the burden on the operator during long distance traveling. It is possible to fix and release the running lever in the inclined posture without
Accordingly, it is an object of the present invention to provide a traveling lever device that can be easily operated, and can reduce the device price and the scale.

It is another object of the present invention to provide a traveling lever device for a construction machine in which the traveling lever can be easily released from being fixed in an inclined posture simply by momentarily applying a force to the traveling lever.

[0008]

According to a first aspect of the present invention, there is provided a travel lever device for operating a travel device of a construction machine, wherein the travel lever device is provided between the travel lever and a cab floor. A posture holding device that holds the posture of the traveling lever in the forward leaning posture and the almost rearmost leaning posture, wherein the posture holding device tilts the posture of the traveling lever toward the front most against the restoring force to the neutral position of the traveling lever. And a holding means using a spring force or a magnetic force for holding the holding member in the posture and the most inclined posture, respectively, and the holding force is set to be weaker than the operation force by the operator.

As described above, between the traveling lever and the driver's cab floor, the posture of the traveling lever is tilted to the foremost position (that is, the most forwardly inclined position or a position close thereto) against the restoring force of the traveling lever to the neutral position. If a posture holding device having a holding means for applying a force for holding the moving lever to the posture leaning to the rear and the posture leaning to the rear (that is, the posture leaning to the last) is provided, the operator can move the traveling lever to the forward leaning posture or a posture close to this or the last posture. The traveling lever can be fixed in the inclined position only by setting the position to the inclined position or a position close thereto.

[0010] Further, the holding force of the holding means is set to be weaker than the force by the operation to the neutral side by the operator.
The operator can release the fixing by the holding means by operating the traveling lever to the neutral side.

According to a second aspect of the present invention, there is provided a travel lever device for a construction machine,
In Claim 1, the posture holding device comprises: an engaging member provided on the traveling lever; and a pair of rollers for sandwiching the engaging member when it is most forwardly inclined or close to it or when it is most recently inclined or close to it. And a spring for urging the rollers toward the side close to each other to hold the engaging member.

In this way, the traveling lever can be fixed by biasing the pair of rollers toward the side of approaching each other by the spring and sandwiching the engaging member provided on the traveling lever between the rollers.

According to a third aspect of the present invention, there is provided a travel lever device for a construction machine,
3. The position holding device according to claim 2, wherein the posture holding device further urges the engaging member in a direction in which the engaging member is pushed out from between the rollers from a state in which the engaging member is held by the pair of rollers, and between the rollers of the engaging member. It is characterized by having an extruding spring in which the spring force increases as the sandwiching depth increases.

As described above, in addition to the roller serving as the holding means and the spring for bringing the roller close to the roller, if a pushing spring for urging the engaging member in a direction to push the engaging member out of the rollers is provided, the traveling lever and the pedal can be instantaneously moved. By operating the push-out spring to generate a reaction force, the holding member can be released from the space between the rollers by the force of the push-out spring.

[0015]

FIG. 1 is a side sectional view of a cab of a hydraulic excavator showing an embodiment of a traveling lever device according to the present invention, and FIG. 2 is an enlarged view of a main part thereof. As shown in FIGS. 1 and 2, a traveling lever 3 is mounted on a floor 2 of a cab 1 so as to be movable back and forth about a pivot portion 4. Travel lever 3
Is integrally provided with a pedal 5. Reference numeral 6 denotes a pilot valve controlled by operating the traveling lever 3, and reference numeral 7 denotes a traveling control valve controlled by the pilot valve 6.
Reference numerals 8 and 9 denote posture holding devices that hold the traveling lever 3 in that posture when the traveling lever 3 has almost reached the most forwardly inclined posture and the most recently inclined posture.

Since the attitude holding devices 8 and 9 have basically the same configuration, a side view of FIG. 3A and a plan view of FIG. This will be described below. 3A and 3B, reference numeral 10 denotes an engaging member provided on the bottom surface of the pedal 5 integrated with the traveling lever 3 and is integrally attached to the arm portion 11 projecting downward.

Reference numeral 12 denotes a bracket fixed to the cab floor 2, and reference numerals 13 and 14 denote a pair of rollers mounted on the bracket 12. The rollers 13 and 14 are
The two ends of the roller shafts 15 and 16 are movably inserted into elongated holes 12b and 12c provided sideways or obliquely as shown in the two vertical plate portions 12a of the bracket 12, and are attached. Therefore, the rollers 13 and 14 can approach and separate from each other.

Reference numeral 17 denotes a shaft 18 fixed to the bracket 12.
The leaf spring 17 is provided on both sides of the rollers 13 and 14, and both ends of the spring 17 are pressed against the roller shafts 15 and 16 to move the rollers 13 and 14 to the arrows a and b. Is urged in the direction of approach as shown in FIG. In the illustrated position where these rollers 13 and 14 are closest to each other, the distance between the rollers 13 and 14 is the width of the engaging member 10 (in this example, since the cross-sectional shape of the engaging member 10 is circular,
(The diameter of the engaging member 10).

When the operator operates the traveling lever 3 or the pedal 5 to move the traveling lever 3 from the neutral position to the most inclined posture or a posture close thereto, the engaging member 10 is moved to the position shown in FIG. The positional relationship is set so as to be sandwiched below the position between the rollers 13 and 14 shown by the solid line from the position shown by the two-dot chain line.

In practice, as shown in FIG. 4A, a dead zone is set near the most forwardly inclined position of the traveling lever 3, that is, the pilot pressure of the pilot valve 6 is not changed even if the traveling lever 3 is inclined. Therefore, when the engaging member 10 reaches the forward leaning position reaching the dead zone, the engaging member 10 interrupts between the rollers 13 and 14 against the force of the spring 17 and is further pressed down, so that the engaging member 10 The rollers 13 and 14 are located below the position between the rollers 14 and 14 and are restored by the force of the spring 17 so as to prevent the engaging member 10 from coming out.

Here, rollers 13 and 14 by spring 17
Is set to such an extent that the travel lever 3 overcomes the force for holding the travel lever 3 at the neutral position by the spring force applied by the spring provided in the pilot valve 6. Is done.

Therefore, the traveling lever 3 is held in the forwardly inclined position by the force of the spring 17, so that the pilot valve 6 keeps holding the control valve 7 at the position for driving the traveling device of the hydraulic excavator. The excavator continues to run without operating the pedal 5.

The rollers 13, 1 of the engaging member 10
As can be understood from the description of the sandwiching between the four members, the holding force by the spring 17 is set to be weaker than the operating force of the operator, and when the operator operates the traveling lever 3 or the pedal 5, the engaging member 10 , 14 can be released from the held state.

By configuring the holding means 8 and 9 in this manner, the traveling lever 3 can be fixed in that position only by setting the traveling lever 3 to the forward inclined position or a position in the vicinity thereof, and no switch operation is required. Therefore, the operation becomes easy. In addition, since an actuator for fixing the traveling lever 3 is not required, the cost of the apparatus is reduced, and
The scale can be reduced.

FIG. 4B shows another embodiment of the present invention. In this embodiment, a spring 20 is added to the configuration shown in FIG. The spring 20 is connected to the bracket 12
When the engaging member 10 is further pushed in from the state shown in which the central portion is attached to the shaft 21 provided in the
Thus, a reaction force is generated to push the engagement member 10 out. Therefore, when the engaging member 10 is sandwiched between the rollers 13 and 14, the spring 20 hardly applies a spring force to the engaging member 10, and when the engaging member 10 is further pushed from the illustrated holding position, The force of the spring 20 is set such that a reaction force is generated by a spring force that overcomes the holding force of the engagement member 10 by the rollers 13 and 14 and the roller 20 can be pulled out from between the rollers 13 and 14 by inertia.

Such a spring 20 is provided as a safety device, and when the operator is performing a release operation using the posture holding device 8 or 9, it is not clear which direction the vehicle is traveling. (When the excavator has the full swing device, it may be difficult to determine whether the vehicle is moving forward or backward as viewed in the direction of the traveling body). Spring 2 just by applying momentary force such as kicking to either side
0 generates a reaction force, and the reaction force
0, the holding state can be released by using the inertial force in the releasing direction applied to the travel lever 3 and the pedal 5, thereby improving the safety.

When the present invention is implemented, the present invention can be applied to a case where the relationship between the traveling lever 3 and the control valve 7 is a system in which the traveling lever 3 and the control valve 7 are mechanically connected. Further, a structure using a simple spring such as a leaf spring or using a magnet can be adopted as the posture holding device without using the rollers 13 and 14. Further, the present invention can also be used for other construction machines such as excavators and cranes other than hydraulic excavators. Further, the present invention can be applied to a configuration having no pedal 5.

[0028]

According to the first and second aspects of the present invention, it is possible to fix and release the traveling lever in the traveling posture only by operating the traveling lever or the pedal without requiring any switch operation. Becomes Further, since an actuator and a switch for fixing and releasing the posture of the traveling lever are not required, the cost of the apparatus is reduced and the scale of the apparatus is small.

According to the third aspect, in addition to the above effects, the instantaneous force is applied to the traveling lever or the pedal to release the fixing of the posture of the traveling lever, so that the safety is improved.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a cab of a hydraulic excavator showing one embodiment of a traveling lever device according to the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

FIG. 3A is a side view of the holding unit of the embodiment,
(B) is a plan view thereof.

FIG. 4A is a correlation diagram between an operation amount and a pilot pressure of a pilot valve for explaining an operation amount of a traveling lever for fixing a posture of the traveling lever according to the present embodiment, and FIG. It is a side view which shows other embodiment of the holding means of this invention.

[Explanation of symbols]

1: cab, 2: cab floor, 3: travel lever,
4: pivot portion, 5: pedal, 6: pilot valve, 7: control valve, 8, 9: posture holding device, 10: engagement member,
11: arm part, 12: bracket, 12b, 12c:
Slots, 15, 16: roller shaft, 17: spring, 18: shaft,
20: Spring, 21: Shaft

Claims (3)

[Claims] 1. A traveling lever device for operating a traveling device of a construction machine, wherein the traveling lever has a forward leaning posture and a rearward leaning posture between the traveling lever and a cab floor. A posture holding device that holds the posture of the traveling lever in a forward leaning posture and a rearward leaning posture, respectively, against a restoring force to a neutral position of the traveling lever. Alternatively, there is provided a traveling lever device for a construction machine having a holding unit using a magnetic force, wherein the holding force is set to be weaker than an operation force by an operator. 2. The posture holding device according to claim 1, wherein the posture holding device comprises: an engagement member provided on a traveling lever;
A pair of rollers for pinching the engagement members when the traveling lever is inclined forward or rearmost, and a spring for urging the rollers toward each other to hold the engagement members. A travel lever device for a construction machine. 3. The apparatus according to claim 2, wherein the posture holding device comprises:
Further, the engagement member is urged in a direction in which the engagement member is pushed out from between the rollers from the holding state of the pair of rollers, and the spring force increases as the sandwiching depth between the rollers of the engagement member increases. A travel lever device for a construction machine, comprising: an extruding spring.