JP3264845B2 - Work equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a working device applied to a working vehicle such as a wheel loader.

[0002]

2. Description of the Related Art Conventionally, as this type of working apparatus, for example, those shown in FIGS. 6 to 8 are known.

[0003] The working device 50 comprises a boom 51 provided on the body 101 of the work vehicle 100 so as to be able to ascend, and a body 1.
01 and a boom 51, a boom cylinder 52 for raising and lowering the boom 51, a work implement 53 such as a bucket provided on the boom 51 so as to be able to raise and lower, a cross member 54 provided on the boom 51, A bell crank 55 rotatably provided on the member 54, and a push rod 56 provided between the work implement 53 and the bell crank 55.
A work tool cylinder 57 provided between the vehicle body 101 and the bell crank 55 for raising and lowering the work tool 53; and a bell crank 55 and a push rod 56 provided between the cross member 54 and the bell crank 55. And a descent restricting means 58 that can bend in a substantially inverted shape to restrict the descent of the work implement 53.

The lowering / restricting means 58 comprises a stopper 59 provided on the bell crank 55 and an abutting surface 60 formed on the cross member 54 and abutting the stopper 59,
Angle θ between bell crank 55 and push rod 56
Was always less than 180 °.

In other words, the pivot point between the cross member 54 and the bell crank 55 is A, the pivot point between the bell crank 55 and the push rod 56 is B, and the pivot point between the push rod 56 and the work implement 53 is If C, straight line AB and straight line BC
Is less than 180 °.

This has been done in accordance with a design practice in order to reliably and smoothly interlock the expansion and contraction movement of the work implement cylinder 57 and the elevating movement of the work implement 53.

[0007] In such a case, when the boom cylinder is operated, the boom is raised. When the work implement cylinder is operated, the work implement is raised via the bell crank and the push rod. When the work implement is lowered and reaches the maximum, further lowering is controlled by the lowering control means.

[0008]

By the way, in order to cut the sticky object or to fly the object farther, the work implement is lowered (forward tilted) by lever operation. In some cases, a so-called hiccup operation may be performed in which the user raises (retreats backward) from the middle.

For example, the working tool is lowered (forward tilted) by shortening the working tool cylinder from the maximum lifting posture shown in FIG. 6 (the angle θ = 70 ° between the bell crank and the push rod), and FIG. Immediately after the maximum lowering posture shown (θ = 171 °, the lowering angle α of the work implement α = 50 °), the work implement is turned upside down by extending the work implement cylinder, and then the posture shown in FIG. (Θ = 165 °, α = 46 °), a hiccup operation can be performed.

[0010] However, in order to perform such a hiccup operation, it is difficult to switch back, so considerable skill is required, and it cannot be easily performed by a normal operator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in order to solve the problem. A purpose of the present invention is to provide a working device in which a normal operator can easily perform a hiccup operation. To provide.

[0012]

A working device according to the present invention basically comprises a boom provided on a vehicle body of a working vehicle so as to be able to descend, and a boom provided between the vehicle body and the boom to raise the boom. A cylinder, a working tool provided on the boom so as to be able to descend, a cross member provided on the boom, a bell crank provided rotatably on the cross member, and provided between the working tool and the bell crank. A push rod,
A work tool cylinder provided between the vehicle body and the bell crank to raise and lower the work tool, and the bell crank and the push rod can be bent from almost inverted to almost o-shaped to restrict the lowering of the work tool The feature lies in the fact that it is composed of the means for restricting the descending.

When the boom cylinder is operated, the boom is raised. When the work implement cylinder is operated, the work implement is raised via the bell crank and the push rod.

In the case of performing a hiccup operation in order to cut a sticky object or to fly the object farther, the working tool cylinder is shortened by lever operation.

[0015] Then, the work implement descends due to the bell crank and the push rod being bent in a substantially inverted shape, and the work implement depends on the bell crank and the push rod being straightened. After reaching the maximum lowering posture, the work implement is raised by the bell crank and the push rod being bent in a substantially elliptical shape, and becomes the raising posture, and further by the lowering restriction means. The raising is restricted, and the hiccup operation is automatically performed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a side view showing a running posture (chain line) and a maximum lifting posture (solid line) of the working apparatus of the present invention. FIG. 2 is a similar view showing a posture (a posture similar to FIG. 8) in the middle of lowering from the maximum elevation posture of FIG. FIG. 3 is a similar view showing a posture further lowered from the posture of FIG. 2 (a posture similar to FIG. 7). FIG. 4 is a similar view showing a maximum lowered posture further lowered from the posture of FIG. 3. FIG. 5 is a similar view showing a posture (the working tool is in the same posture as in FIG. 2) raised from the maximum downward posture in FIG.

The main part of the working device 1 is composed of a boom 2, a boom cylinder 3, a working tool 4, a cross member 5, a bell crank 6, a push rod 7, a working tool cylinder 8, and a lifting / lowering regulating means 9. In this example, the present invention is applied to a work vehicle 100 such as a wheel loader.

The work vehicle 100 includes a vehicle body 101 and a traveling device 102 such as wheels provided on the vehicle body 101.

The boom 2 is mounted on a vehicle body 101 of the work vehicle 100.
In this example, a left and right pair is provided, and a base end thereof is pivotally connected to a front upper portion of the vehicle body 101 by a horizontal axis 10.

The boom cylinder 3 is provided between the vehicle body 101 and the boom 2 and raises and lowers the boom 2. In this example, the tail side has a horizontal shaft 11 on the lower front side of the vehicle body 101.
, And the rod side is pivotally connected by a horizontal axis 12 in the middle of the boom 2.

The work implement 4 is provided on the boom 2 so as to be able to descend. In this example, the work implement 4 is a bucket, and the lower rear portion is pivotally connected to the tip of the boom 2 by a horizontal shaft 13.

The cross member 5 is provided on the boom 2. In this example, a connecting member 14 having an elliptical section in cross section is provided to connect the middle portions of the left and right booms 2, and is provided on the connecting member 14. And a supporting plate 15 which is provided.

The bell crank 6 is rotatably provided on the cross member 5, and in this example, the middle thereof is pivotally connected to the tip of the support plate 15 of the cross member 5 by a horizontal shaft 16.

The push rod 7 is provided between the work implement 4 and the bell crank 6. In this example, one end of the push rod 7 is pivotally connected to the rear upper portion of the work implement 4 by a horizontal shaft 17. The other end is pivotally connected to one end of the bell crank 6 by a horizontal shaft 18.

The work implement cylinder 8 is provided between the vehicle body 101 and the bell crank 6 to raise and lower the work implement 4. In this example, the tail side is attached to a bracket 19 provided on the upper front side of the vehicle body 101 by a horizontal axis. The rod side is connected to the other end of the bell crank 6 by a horizontal shaft 21.

The lowering and lowering restricting means 9 restricts the lowering and lowering of the working tool 4 by bending the bell crank 6 and the push rod 7 from a substantially inverted letter shape to a substantially elliptical letter shape.
An abutting surface 22 which is provided between the cross member 5 and the bell crank 6, specifically, formed on the rear side between the middle and the other end of the bell crank 6, An abutment surface 23 is formed on the connecting member 14 and abuts against the abutment surface 22 so that the angle θ between the bell crank 6 and the push rod 7 can exceed 180 °.

In other words, the pivot point between the cross member 5 and the bell crank 6 is A (horizontal axis 16), the pivot point between the bell crank 6 and the push rod 7 is B (horizontal axis 18), and the push rod 7 When the pivot point between the tool and the work implement 4 is C (horizontal axis 17), the angle θ between the straight line AB and the straight line BC can exceed 180 °.

The angle θ is 180 ° to 210 ° (18
0 °), preferably 190 ° to 200 °.
If it is smaller than this range, the output power due to the raising of the working tool 4 tends to be small, and if it is large, the raising time of the working tool 4 tends to be long and the timing of releasing tends to be bad.

Next, the operation will be described based on such a configuration.

When the boom cylinder 3 is operated, the boom 2 is raised. When the work implement cylinder 8 is operated, the work implement 4 is lowered via the bell crank 6 and the push rod 7.

In the case of performing a hiccup operation to cut a sticky object or to fly the object farther, a maximum lifting position (a bell crank 6 and a push rod) shown in FIG. The working implement cylinder 8 is shortened from the angle θ = 70 ° formed with the working tool cylinder 7).

Then, the work implement 4 is lowered by the bell crank 6 and the push rod 7 being bent in a substantially inverted shape, and the posture shown in FIG. 2 (θ = 165 °, work implement 4 Angle of inclination α = 46 °), the posture shown in FIG. 3 (θ = 171 °, α = 50 °), and the bell tool 6 and the push rod 7 are aligned in a straight line. 4 is the maximum downward posture shown in FIG. 4 (θ = 180 °, α
= 51 °), and then the bell tool 6 and the push rod 7 are bent in a substantially elliptical shape so that the work implement 4
And the posture shown in FIG. 5 (θ = 190 °, α = 46)
°), and the contact surface 22 and the contact surface 23 of
Is met, further raising is restricted, and the hiccup operation is automatically performed.

That is, only by shortening the working tool cylinder 8 by operating the lever in one direction, the hiking operation can be performed by raising the working tool 4 and then raising it.

The work implement 4 is a bucket in the above example, but is not limited to this, and may be, for example, a fork or the like.

In the above example, the lowering / restricting means 9 is provided between the cross member 5 and the bell crank 6. However, the present invention is not limited to this. For example, it may be provided between the boom 2 and the work implement 4.

In the above example, the lowering / restricting means 9 is used for the contact surface 2.
However, the present invention is not limited to this. For example, the stoppers may be constituted by stoppers, or may be constituted by stoppers and abutment surfaces.

[0038]

As described above, according to the present invention, as described above,
The following excellent effects can be obtained. (1) Boom, boom cylinder, work implement, cross member, bell crank, push rod, work implement cylinder,
It is composed of lowering control means.
Since the bell crank and the push rod can be bent from a substantially inverted letter shape to a substantially letter letter shape to restrict the lowering and lowering of the working tool, a normal operator can easily perform a hiking operation. (2) The work implement is raised after being lowered, and at the end of the raising, the lowering control means works so that the further raising is restricted, so that inertia is easily generated and the handling object is secured. Can be released. (3) The lowering control means is configured to be able to bend the bell crank and the push rod from a substantially inverted character to a substantially elliptical shape to restrict the lowering of the work implement. It can be larger than before. (4) Since it is only necessary to change the lowering and lowering restricting means, the structure is very simple, the cost is low, and the implementation is easy.

[Brief description of the drawings]

FIG. 1 is a side view showing a running posture (chain line) and a maximum lifting posture (solid line) of a working device of the present invention.

FIG. 2 is a similar view showing a posture (a posture similar to FIG. 8) in the middle of being lowered from the maximum elevation posture of FIG. 1;

3 is a similar view showing a posture further lowered from the posture of FIG. 2 (a posture similar to FIG. 7).

FIG. 4 is a view similar to FIG. 3 showing a maximum lowered posture further lowered from the posture of FIG. 3;

FIG. 5 is a similar view showing a posture (the working tool is in the same posture as in FIG. 2) raised from the maximum downward posture in FIG. 4;

FIG. 6 is a side view showing a running posture (chain line) and a maximum lifting posture (solid line) of a conventional working device.

FIG. 7 is a view similar to FIG. 6, showing the maximum downward posture lowered from the maximum elevation posture of FIG. 6;

FIG. 8 is a similar view showing a posture raised from the posture of FIG. 7;

[Explanation of symbols]

1, 50: working device, 2, 51: boom, 3, 52: boom cylinder, 4, 53: working tool, 5, 54: cross member, 6, 55: bell crank, 7, 56: push rod, 8, 57: working tool cylinder, 9, 58: lowering and lowering restricting means, 10 to 13, 16 to 18, 20, 21: horizontal axis, 1
4 ... Connecting material, 15 ... Support plate, 19 ... Bracket, 22,2
Reference numeral 3, 60: contact surface, 59: stopper, 100: work vehicle, 101: vehicle body, 102: traveling device, A, B, C: pivot point, θ: angle, α: depression angle.

Claims (1)

(57) [Claims] 1. A boom provided on a vehicle body of a work vehicle so as to be able to elevate, a boom cylinder provided between the vehicle body and the boom to elevate the boom, a work implement provided to be able to elevate the boom, and a boom , A bell crank rotatably provided on the cross member, a push rod provided between the work implement and the bell crank, and a work provided between the vehicle body and the bell crank. A work implement cylinder for raising and lowering the implement, and a restraint restricting means for restricting the work implement from lowering by allowing the bell crank and the push rod to bend from a substantially inverted shape to a substantially elliptical shape .
A, Bellclan at the pivot point between the Ross member and Bellcrank
B is the pivot point between the push rod and
When the pivot point with the working tool is C, the straight line AB and the straight line BC
The working device is characterized in that the angle θ made by the device can exceed 180 ° .