JP2012207485A - Stabilizer of backhoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stabilizer of a backhoe capable of bearing a grounding load around a pivot shaft placed on a pad body by a stabilizer arm by stabilizing a grounding attitude when a biting grounding part of the pad body is arranged at an operation position.SOLUTION: The stabilizer includes a stabilizer arm 3 which has a base part thereof pivoted on a backhoe frame 2 and is provided with a pivot bracket part 3A atop; an arm cylinder 5 which has a tip thereof coupled to the pivot bracket part 3A through a pivot pin 4 so as to elevate the stabilizer arm 3; and a pad body 8 which can have a horizontal grounding part 8A substantially facing a ground surface, and a biting grounding part 8B formed in a mountain shape so as to bite into the ground surface, selectively arranged at the operation position by being coupled to the pivot bracket part 3A through a pivot shaft 6 and rotating. The pivot bracket part 3A and the pad body 8 are provided with an engaged part 9 and an engaging part 10 which come into surface contact with each other to engage each other and bear a grounding load when the biting grounding part 8B is arranged at the operation position.

Description

  The present invention relates to a backhoe stabilizer in a tractor loader backhoe (TLB) or the like.

  In the prior art of the backhoe stabilizer attached to the rear portion of the tractor, as disclosed in Patent Document 1, a bracket fixed to the fuselage, a leg pivotally supported at one end of the bracket, and the bracket And a stabilizer pad that is rotatably supported at the other end of the leg body, and a stabilizer pad (such as hard soil with a dry ground ground to the stabilizer pad). In order to be able to use properly by rotating the grounding plate to be grounded and the protrusion to be grounded when the grounding ground is a slippery soft ground such as soil containing a lot of water) At the end of the support shaft that pivotally supports the actuator, a rotation restricting mechanism that restricts the rotation of the stabilizer pad is provided, and the rotation restricting mechanism is The insertion hole drilled from the end surface of the support shaft includes a contact member disposed so as to be able to contact the side surface of the stabilizer pad, and a biasing member that biases the corresponding contact member in the protruding direction ( (See claims 1 and 2 of Patent Document 1).

  In the stabilizer of Patent Document 1, when the stabilizer is rotated downward about the pivot shaft, the stabilizer can be grounded on a non-slip processed surface (with the protrusion facing downward), In this state, when the stabilizer is raised when the backhoe loader moves or interrupts the operation, the stabilizer pad is restricted from rotating by contacting the contact member. Thereby, it is possible to prevent the stabilizer pad from being inverted by rotating until the ground plate faces downward.

JP 2010-71011 A

The above-mentioned prior art can use the grounding plate and the protrusion properly, and when the stabilizer is raised, the rotation of the stabilizer pad can be restricted, but the rotation of the stabilizer pad is performed with the protrusion grounded. Therefore, it is difficult to support the grounding load in the rotating direction because the grounding posture is not stabilized in soft ground.
An object of the present invention is to provide a backhoe stabilizer capable of solving such problems of the prior art.

  The present invention provides a backhoe that stabilizes the grounding posture and supports the grounding load around the pivot shaft on the pad body by the stabilizer arm when the biting grounding part of the pad body is disposed at the operating position. An object is to provide a stabilizer.

Specific means for solving the problems in the present invention are as follows.
First, a stabilizer arm 3 whose base is pivotally supported by the backhoe frame 2 and provided with a pivot bracket 3A at the tip, and a pivot pin 4 is mounted on the pivot bracket 3A so as to move the stabilizer arm 3 up and down. The arm cylinder 5 connected via the pivot bracket 6A and the horizontal grounding portion 8A, which is connected to the pivot bracket 6A via the pivot shaft 6 and is substantially opposed to the ground by rotating, and a mountain shape that can bite into the ground. A backhoe stabilizer having a pad body 8 capable of selectively arranging the biting grounding portion 8B at the working position,
The pivot support bracket portion 3A and the pad body 8 are respectively provided with an engagement receiving portion 9 and an engagement portion 10 which are engaged with each other and support a grounding load when the biting grounding portion 8B is disposed at the operating position. It is provided.

Secondly, the engagement receiving portion 9 of the pivot support bracket portion 3A is arranged on the outer side of the pivot pin 4 and further away from the distance from the pivot shaft 6 to the pivot pin 4. To do.
Thirdly, the pad body 8 has a horizontal grounding portion 8A extending outwardly from a mountain skirt of a pair of biting grounding portions 8B sandwiching the pivotal bracket portion 3A and fitted to the pivotal shaft 6, respectively. The pair of biting grounding portions 8B are connected by a connecting portion 11 that forms an engaging portion 10 that intersects the pivot bracket portion 3A, and the outer surface of the biting grounding portion 8B and the horizontal grounding portion 8A are reinforced in the vicinity of the connecting portion 11. It is characterized by being connected by the part 12.

According to the present invention, when the biting grounding portion of the pad body is arranged at the operating position, the grounding posture can be stabilized and the grounding load around the pivot shaft applied to the pad body can be supported by the stabilizer arm.
That is, according to the first aspect of the present invention, when the engagement receiving portion 9 and the engagement portion 10 provided on the pivot bracket portion 3A and the pad body 8, respectively, are arranged so that the biting grounding portion 8B is disposed at the operating position. Since the contact per surface is engaged, the grounding posture on the soft ground can be stabilized and the grounding load around the pivot shaft applied to the pad body 8 can be supported by the stabilizer arm 3.

The invention according to claim 2 can support the ground load applied to the pad body 8 around the pivot shaft 6 at a position far from the pivot pin 4.
In the invention according to claim 3, the engaging portion 10 is formed in the connecting portion 11 that connects the pair of biting grounding portions 8B sandwiching the pivot bracket portion 3A, and is engaged at a position where the pivot bracket portion 3A intersects. Since it can engage with the receiving part 9, the engaging part 10 and the engagement receiving part 9 can be formed easily and firmly.

It is a section front view of the important section showing an embodiment of the present invention. It is the whole stabilizer front view which grounded the pad body. It is a perspective view of the principal part. It is a top view of the principal part. It is a side view of the principal part. It is the whole backhoe side view.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
2 and 6 show a backhoe 16 applied to a work vehicle called a tractor loader backhoe (TLB). The backhoe 16 is attached to and detached from a pair of left and right mounting frames 18 fixed to the tractor vehicle body 17. It is connected freely.
The backhoe 16 includes a backhoe frame 2 connected to a mounting frame 18, a pair of stabilizers 1 provided on the left and right sides of the backhoe frame 2, a control device 19 and a cockpit 20 disposed on the backhoe frame 2, and a backhoe frame. 2, a swing bracket 21 that is swingably supported around the vertical axis, a boom 22 that is supported by the swing bracket 21 so as to be vertically movable around the horizontal axis, and a boom 22 that moves up and down around the horizontal axis at the tip of the boom 22. A freely supported arm 23, a first work tool (bucket) 24, a second work tool 25, and the like provided at the tip of the arm 23 are provided.

The backhoe frame 2 has upper and lower plates 28 and 29 connected by a pair of left and right front connecting plates 30 and a horizontal connecting plate 31, and the horizontal connecting plate 31 is formed of a steel material having a U-shaped horizontal cross section. A pair of front and rear connection walls 31a is provided, and the pair of front and rear connection walls 31a support the base portion of the stabilizer 1.
Each of the left and right stabilizers 1 includes a stabilizer arm 3 whose base is pivotally supported at the lower part of the front and rear connecting wall 31 a, an arm cylinder 5 that lifts and lowers the stabilizer arm 3, and a pad body 8 provided at the tip of the stabilizer arm 3. Have.

The stabilizer arm 3 has a pivot bracket part 3A formed by fixing the lower parts of a pair of left and right plates at the tip, and a cylinder rod 5a of the arm cylinder 5 via a pivot pin 4 on the pivot bracket part 3A. Are connected.
In the arm cylinder 5, the base side of the cylinder tube 5b is connected to the upper and lower middle part of the front and rear connecting wall 31a, and the expansion and contraction of the arm cylinder 5 causes the stabilizer arm 3 to protrude from the backhoe frame 2 to the lower left and right as shown in FIG. The posture is changed to a posture and a retracted posture in which the stabilizer arm 3 is folded from the backhoe frame 2 to the upper left and right sides.

  2-6, the said pad body 8 bends the front-and-rear end of the horizontal-plate part of a board | plate material to the up-down opposite direction, arrange | positions it in the back-and-forth symmetrical form, Are connected by connecting plates, and a flat horizontal plate portion of each plate material and a plate portion bent downward become a horizontal grounding portion 8A substantially facing the ground, and the vertical plate portion can bite into the ground. This is a biting grounding portion 8B.

The pad body 8 is pivotally connected to the pivot bracket portion 3A via the pivot shaft 6 so that the center of the biting ground portion 8B is pivotable, and the connecting plate crosses the plate surface of the pivot bracket portion 3A. The connecting portion 11 is arranged.
In other words, the biting grounding portion 8B has a mountain shape when viewed in the axial direction (front-rear direction) of the pivot shaft 6, and the horizontal grounding portion 8A extends outwardly (front-back direction) from the mountain bottom of the biting grounding portion 8B. Yes. The pair of biting grounding portions 8B are positioned with the pivot bracket portion 3A interposed therebetween, and their end portions (or the end portions of the horizontal grounding portion 8A) are connected by the connecting portion 11.

Further, the outer surface in the vicinity of the connecting portion 11 of each biting grounding portion 8B and the flat portion of the horizontal grounding portion 8A are connected by the reinforcing portion 12, and the horizontal grounding portion 8A and the biting grounding portion 8B are substantially perpendicular to each other by the reinforcing portion 12. Thus, the front and rear biting grounding portions 8B can resist the deformation force that pushes forward and backward by the load at the time of grounding.
An anti-slip member 13 such as an uneven metal plate or rubber body is bolted to the lower surface of the flat portion of the horizontal grounding portion 8A. The anti-slip member 13 is detachable, and is attached and detached according to the hardness state of the ground. When the anti-slip member 13 is not provided, the horizontal grounding portion 8A functions as a non-slip portion 8C by bending downward from the end, and the bottom surface of the horizontal grounding portion 8A is grounded while the anti-slip portion 8C bites into the ground. .

  The pad body 8 can be changed to a horizontal action position where the horizontal grounding portion 8A faces downward and a biting action position where the biting grounding portion 8B faces downward and bites into soft ground by rotating around the pivot shaft 6. When the pad body 8 is brought into the biting action position, an engagement receiving portion 9 with which the connecting portion 11 is engaged is formed on the outer peripheral side of the pivot support bracket portion 3A. This engagement receiving portion 9 A portion on the connecting portion 11 that engages with the engaging portion 10 is the engaging portion 10.

A part of the outer periphery of the pivot support bracket part 3A protrudes radially outward to form a step part, and the step part is used as an engagement receiving part 9, and engages with the engagement part 10 per surface. ing. The engagement receiving portion 9 is located on the outer diameter side of the pivot pin 4 and is disposed farther than the distance from the pivot shaft 6 to the pivot pin 4 so as to receive a small load.
1 to 6, the pad body 8 can be easily selected and arranged in a horizontal action position and a biting action position by artificially turning clockwise and counterclockwise around the pivot shaft 6. When the pad arm 8 is grounded by lowering the stabilizer arm 3 downward and downward on the dry hard ground or concrete surface, it is placed in the horizontal action position, and when it is grounded on the moisture-rich ground or slippery soft ground, the bite action position (State shown in FIG. 1).

  In the horizontal action position shown in FIG. 2, since the pad body 8 has a heavy horizontal grounding portion 8 </ b> A, the horizontal grounding portion 8 </ b> A is disposed substantially horizontally below the pivot shaft 6. Further, the center of gravity of the pad body 8 is set substantially directly below the pivot shaft 6 so that the horizontal grounding portion 8 </ b> A is substantially horizontal when the pad body 8 is suspended from the pivot shaft 6. When the horizontal grounding portion 8A comes into contact with the inclined ground surface, the horizontal grounding portion 8A rotates around the pivot shaft 6 so as to be in contact with the inclined surface.

  In the biting action position shown in FIG. 1 where the pad body 8 is rotated counterclockwise by 180 degrees or more from the horizontal action position, the horizontal grounding portion 8A is inclined outwardly upward (upwardly in FIG. 1), and the pivot shaft 6 Since the horizontal distance from the axial center to the engaging portion 10 is longer than the horizontal distance from the shaft center and the weight of the horizontal grounding portion 8A is increased on the opposite side, the engaging portion 10 swings upward and is engaged. It abuts on the receiving portion 9 and the state is maintained. That is, the pad body 8 is set so that its center of gravity is located on the inner side (on the left side in FIG. 1) above the pivot shaft 6 when it is rotated to the biting position.

  When the pad body 8 is in the biting action position, the engaging portion 10 engages with the engagement receiving portion 9 in contact with the surface, thereby preventing the rotation around the pivot shaft 6 (counterclockwise in FIG. 1) The grounding posture of the pad body 8 itself and the stabilizer 1 as a whole is stabilized, and the grounding load of the pad body 8 is transmitted to the pivot support bracket part 3A via the engaging part 10 and the engaging receiving part 9, and by the stabilizer arm 3. Supported.

  Depending on the size of the backhoe 16, the place of use, etc., different shapes such as the shape of the stabilizer arm 3 and the size or shape of the pad body 8 are applied, but the distance from the pivot shaft 6 to the engagement receiving portion 9; By making the distance from the pivot shaft 6 to the engaging portion 10 the same, it is possible to share parts, and one type of pad body 8 is also used as a stabilizer arm 3 for a plurality of types of backhoes 16. Or design freedom such as strength, design, cost balance, etc. of the pad body 8 can be achieved.

In the present invention, the shape of each member and the positional relationship between the front, rear, left, and right in the above embodiment are best configured as shown in FIGS. However, it is not limited to the said embodiment, A member, a structure can be variously deformed, and a combination can also be changed.
For example, the engagement part 10 of the pad body 8 may be formed of a round bar, and the engagement receiving part 9 of the pivot bracket part 3A may be formed in an arc recess that is in surface contact with the round bar.

DESCRIPTION OF SYMBOLS 1 Backhoe stabilizer 2 Backhoe frame 3 Stabilizer arm 3A Pivoting bracket part 4 Pivoting pin 5 Arm cylinder 6 Pivoting shaft 8 Pad body 8A Horizontal grounding part 8B Biting grounding part 9 Engagement receiving part 10 Engaging part 11 Connecting part 12 Reinforcement part 13 Anti-slip member

Claims (3)

A stabilizer arm (3) having a base pivotally supported on the backhoe frame (2) and provided with a pivot bracket (3A) at the tip, and a pivot bracket (3A) at the tip to raise and lower the stabilizer arm (3) And an arm cylinder (5) connected to the support bracket part (3A) via a pivot shaft (6) and pivoted to the ground. A backhoe stabilizer having a pad body (8) capable of selectively arranging an opposing horizontal grounding portion (8A) and a mountain-shaped biting grounding portion (8B) capable of biting into the ground at an operating position,
An engagement receiving part (9) for supporting the grounding load by engaging each other with the pivot support bracket part (3A) and the pad body (8) when the biting grounding part (8B) is disposed at the operating position. And the engaging portion (10) are provided, respectively.   The engagement receiving portion (9) of the pivot bracket portion (3A) is disposed on the outer side of the pivot pin (4) and further away from the distance from the pivot shaft (6) to the pivot pin (4). The backhoe stabilizer according to claim 1, wherein the backhoe stabilizer is provided.   The pad body (8) has a horizontal grounding portion (8A) outward from the mountain skirts of a pair of biting grounding portions (8B) sandwiching the pivotal bracket portion (3A) and fitted to the pivotal shaft (6). The pair of biting grounding portions (8B) are connected by a connecting portion (11) that forms an engaging portion (10) that crosses the pivot bracket portion (3A), and the connecting portion (11) 3. The backhoe stabilizer according to claim 1, wherein an outer surface of the biting grounding portion (8 </ b> B) and a horizontal grounding portion (8 </ b> A) are connected by a reinforcing portion (12) in the vicinity. 4.