JP2017056831A - Support leg operation device of work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote simpler structure, lower cost, and lighter weight of a support leg operation device by allowing protrusion and storage of a plurality of shrinkable arms which support a support leg by using a single drive source, relating to an operation device for the support leg that supports a work vehicle such as a concrete pump vehicle.SOLUTION: A shrinkable arm that supports a support leg 40 of a vehicle comprises an outer arm 10, an inner arm 20, and a jack arm 30. These arms are allowed to contract/extend through chain mechanisms C1, C2 by using a single hydraulic motor M.SELECTED DRAWING: Figure 2

Description

  The present invention is an operation device for a support leg that supports a work vehicle such as a concrete pump vehicle, and reduces the weight of the support leg. In particular, when the support leg is operated, a long overhang is secured to stably support the vehicle. Further, the present invention relates to a support leg actuating device for a work vehicle that can be compactly stored in a vehicle body frame when the support leg is not actuated.

  2. Description of the Related Art Conventionally, work vehicles such as concrete pump vehicles are equipped with support legs (outriggers) to stably support a work vehicle being worked on the ground. Conventional support legs are extended and retracted by a telescopic cylinder. However, since the telescopic cylinder is heavy, a hydraulic motor is used instead of the telescopic cylinder (see Patent Document 1 described later). reference).

  By the way, what is shown by patent document 1 inserts the inner arm 2 in the outer arm 1 fixed to a vehicle body frame, equips the front-end | tip of the inner arm 2 with the jack (support leg) R, and the inner arm 2 with respect to the outer arm 1 is equipped. In this case, the jack is extended by sliding and the grounding position of the jack is kept away from the vehicle to prevent the vehicle from falling, and a pair of sprockets 7 and 8 are pivotally supported inside the outer arm 1 and these sprockets are supported. An endless chain 10 is wound between 7 and 8, a drive motor 5 provided on the outer arm 1 is connected to one sprocket 7, and an appropriate position of the chain 1 is connected to an inner arm 2. The arm 2 can be slid with respect to the outer arm 1.

Japanese Utility Model Publication No. 3-116384

  However, in this Patent Document 1, in order to increase the extension amount of the inner arm in order to enhance the support function of the support leg, it is necessary to secure a space for storing the inner arm in the vehicle body frame. In the working vehicle, since the space is limited, there is a problem that the amount of extension of the inner arm is naturally limited.

  Therefore, in order to solve such a problem, the inner arm may be multi-staged with respect to the outer arm, but in this case, a plurality of drive motors for driving a plurality of sets of chain mechanisms are required, and the support legs are required. There is a problem of increasing the weight and cost of the actuator.

  The present invention has been made in view of such a situation, and enables a plurality of telescopic arms to be smoothly expanded and contracted by a single driving source, thereby solving the above-mentioned problems, and extending and retracting support legs together. It is an object of the present invention to provide a novel support leg actuating device for a work vehicle that can be stably, quickly and lightly performed.

In order to achieve the above object, the invention of claim 1 is directed to an outer arm supported by a vehicle body frame, an inner arm slidably fitted to the outer arm, and a jack arm slidably fitted to the inner arm. A jack provided at the tip of the jack arm, a single drive source supported by the outer arm, and a chain driven between the outer arm, the inner arm and the jack arm and driven by the drive source. With the mechanism,
The chain mechanism is
A pair of sprockets pivotally supported by the outer arm and a first endless chain wound between the sprockets, one of the sprockets being connected to the drive source, and a first endless shape A first chain mechanism in which an intermediate part of the chain is fastened to the inner arm;
A pair of sprockets pivotally supported by the inner arm and a second endless chain wound between the sprockets, one of the sprockets being interlocked with the first endless chain; And a second chain mechanism in which an intermediate portion of the second endless chain is fastened to the jack arm;
It is characterized by comprising.

In order to achieve the above object, the invention of claim 2 is the invention of claim 1,
The first endless chain of the first chain mechanism is linked to the second endless chain of the second chain mechanism via a speed increasing mechanism.

  To achieve the above object, according to a third aspect of the present invention, in the second aspect of the present invention, the speed increasing mechanism may be an interlocking sprocket capable of rotating integrally with one sprocket of the second chain mechanism. It is characterized in that the first endless chain of the chain mechanism is engaged.

  According to the invention of each claim, the telescopic arm composed of an outer arm, an inner arm and a jack arm, which are slidably fitted, can be extended and stored by a single drive source. Thus, the apparatus can be provided at a low cost and the weight thereof can be reduced, and the extension and storage of the support legs can be performed stably and lightly.

  According to the invention of claim 2, since the first endless chain of the first chain mechanism is interlocked with the second endless chain of the second chain mechanism via the speed increasing mechanism, The drive speed of the second chain mechanism is faster than the drive speed of the first chain mechanism, and the extension speed of the jack arm can be made faster than the extension speed of the inner arm. As a result, when the telescopic arm is extended, the overlapping margin between the outer arm and the inner arm is longer than the overlapping margin between the inner arm and the jack arm. Safe and stable overhanging.

  According to the invention of claim 3, the speed increasing mechanism is formed by meshing the endless chain of the first chain mechanism with an interlocking sprocket that can rotate integrally with one sprocket of the second chain mechanism. Therefore, the number of parts can be reduced and provided inexpensively.

The side view of the concrete pump vehicle provided with the support leg actuating device concerning the present invention. FIG. 2 is an enlarged view taken along line 2-2 in FIG. 1, (A) shows an extended state of the support leg, and (B) shows a retracted state of the support leg. Enlarged view of the phantom line encircled portion indicated by arrow 3 in FIG. Sectional view along line 4-4 in FIG. Enlarged view of the phantom line encircled portion in FIG. Enlarged view of the phantom line encircled portion in FIG. Sectional view along line 7-7 in FIG. Enlarged view of the phantom line encircled portion shown in FIG. FIG. 9 arrow 9 view FIG. 3 is an enlarged cross-sectional view taken along line 10-10 of FIG. FIG. 11 is an enlarged cross-sectional view taken along line 11-11 of FIG.

  A preferred embodiment of the present invention will be described with reference to FIGS.

  The following embodiment is a case where the support leg actuating device of the present invention is implemented in a concrete pump vehicle, where the front and rear in the traveling direction of the concrete pump vehicle are “front and rear”, the upper and lower are “up and down”, and the left and right are “left and right” "

  In FIG. 1, a support column 2 is mounted on a body frame 1 of a concrete pump vehicle V so as to be pivotable about a vertical axis, and a multistage bending boom 3 can be bent up and down by a plurality of telescopic cylinders 4 on the support column 2. Connected. The multi-stage telescopic boom 3 is supported by a boom pipe 5 for feeding ready-mixed concrete along the boom.

  On the left and right sides of the body frame 1 of the concrete pump vehicle V, support legs (outriggers) 40 for stably supporting the vehicle V are provided so as to extend outward and be retractable.

  Below, the structure of the operating device which extends and retracts the support leg 40 according to the present invention will be described.

  As shown in FIGS. 1 and 2, an outer arm 10 made of a hollow rectangular tube is pivotally supported 15 on the body frame 1 of the concrete pump vehicle V so as to be rotatable in the left-right direction. An inner arm 20 made of a hollow rectangular tube is slidably fitted in the outer arm 10, and a jack arm 30 made of a hollow rectangular tube is also slidable in the inner arm 20. A support leg (jack) 40 is provided at the tip of the jack arm 30. The outer arm 10, the inner arm 20, and the jack arm 30 constitute an extendable arm that projects and stores the support leg 40. A reinforcing frame 11 is integrally provided at the tip of the outer arm 10 so as to firmly support the inner arm 20 when the inner arm 20 is extended, and the jack arm 30 is extended at the tip of the inner arm 20. The reinforcing frame 21 is integrally provided to firmly support the jack arm 30.

  As shown in FIGS. 2 to 7, in the gap formed between the outer arm 10 and the inner arm 20, the first chain mechanism for extending and retracting the inner arm 20 with respect to the outer arm 10, that is, extending and retracting. C1 is disposed. The first chain mechanism C1 includes a first drive sprocket 51 that is rotatably supported on the inner surface of the side wall of the outer arm 10 and is connected to a motor shaft Ms of a hydraulic motor M described later, and an outer arm. 10 includes a first driven sprocket 52 rotatably supported on an inner wall surface near the rear portion of the 10 and a first endless chain 53 wound between the first drive and driven sprockets 51 and 52.

A single hydraulic motor M as a drive source is fixed to the outer surface of the wall surface near the front portion of the outer arm 10. The motor shaft Ms of the hydraulic motor M is connected to the first drive sprocket 51, and the first chain mechanism C1 is reciprocated in the left-right direction by the forward / reverse rotation drive of the hydraulic motor M. A bracket 54 is connected to an appropriate position of the first endless chain 53, and the bracket 54 is fastened to a connecting member 24 fixed to the side wall surface of the inner arm 20.

  Therefore, when the first chain mechanism C1 is driven forward and backward by controlling the hydraulic motor M forward and backward, the inner arm 20 is extended and contracted (left and right) with respect to the outer arm 10, and is extended. Stored.

  As shown in FIGS. 8 and 9, a manual tensioner T <b> 1 for adjusting the tension of the first endless chain 53 of the first chain mechanism C <b> 1 is provided on the rear outer surface of the outer arm 10.

  A driven shaft 55 that rotatably supports the first driven sprocket 52 of the first chain mechanism C1 is fixed to a movable plate 77 that is provided on the wall surface of the outer arm 10 so as to be adjustable in the left-right direction. The plate 77 is provided so as to be adjustable in the left-right direction on a fixed plate 78 fixed to the outer surface of the outer arm 10. Adjustment bolts 80 with nuts fixed to the fixed plate 78 are attached to a plurality of adjustment holes 79 opened in the movable plate 77, and the movable plate 77 is moved in the left-right direction by adjusting the screwing of the adjustment bolts 80 with nuts. The position is adjusted. A lock bolt 81 to which a lock nut 82 is screwed is bridged between the fixed plate 78 and the movable plate 77, and the position of the first driven sprocket 52 is adjusted by adjusting the screw tightening of the lock nut 82. The tension of one chain mechanism C1 is adjusted.

  As shown in FIGS. 2 to 7, in the gap formed between the inner arm 20 and the jack arm 30, the jack arm 30 is extended and retracted with respect to the inner arm 20. A chain mechanism C2 is provided. The second chain mechanism C2 includes a second drive sprocket 61 that is rotatably supported on the inner wall surface near the rear part of the inner arm 20 and a shaft that is rotatably supported on the inner wall surface near the front part of the inner arm 20. The second driven sprocket 62 and the second endless chain 63 wound between the second drive sprocket 61 and the second driven sprocket 62 are configured.

  A bracket 64 is connected to an appropriate position of the second endless chain 63, and the bracket 64 is fastened to a connecting member 34 fixed to the side wall surface of the jack arm 30.

  Therefore, when the second chain mechanism C2 is driven forward and backward, the jack arm 30 is extended and retracted by being expanded and contracted (left and right direction) with respect to the inner arm 10.

  By the way, the second chain mechanism C2 is driven at a speed higher than that by the single hydraulic motor M in conjunction with the first chain mechanism C1 through a speed increasing mechanism SU described below. It has come to be.

  Next, the structure of the speed increasing mechanism SU will be described. As shown in FIGS. 6 and 7, the second drive sprocket 61 of the second chain mechanism C2 has an interlocking sprocket 70 having a larger diameter than this, The interlocking sprocket 70 is engaged with the first endless chain 53 of the first chain mechanism C1 over a substantially half circumference thereof. The second chain mechanism C2 is driven to travel by the first chain mechanism C1 via the interlocking sprocket 70. A pair of small-diameter idle sprockets 71 for preventing tooth skipping are pivotally supported on the inner arm 20 on both sides of the interlocking sprocket 70 and meshed with the first endless chain 53.

  The number of teeth of the interlocking sprocket 70 is less than twice the number of teeth of the second drive sprocket.

  The number of teeth of the interlocking sprocket 70 is set according to the driving speed of the jack arm 30 relative to the inner arm 20.

  By the way, the interlocking sprocket 70 is rotated counterclockwise by meshing with the first endless chain 53 by moving in the same direction as the inner arm 20 moves in the left direction. By rotating counterclockwise by the first endless chain 53 of the chain mechanism C1, the second drive sprocket 61 integrated with the interlocking sprocket 70 is driven at a higher speed than the first drive sprocket 51. As a result, the traveling speed of the second endless chain 63 of the second chain mechanism C2 is faster than the traveling speed of the first endless chain 53 of the first chain mechanism C1, thereby the jack arm 30 is The outer arm 20 moves outward faster than the inner arm 20.

  A second tensioner T2 for adjusting the tension of the second chain of the second chain mechanism is provided at the tip of the inner arm. Since the second tensioner T2 has the same structure as the first tensioner T1 (see FIGS. 8 and 9), the description thereof is omitted.

  As shown in FIGS. 2 and 5, a support leg 40 (jack) is provided at the tip of the jack arm 30. The support leg 40 is formed by fitting a movable leg 42 so that the movable leg 42 can be expanded and contracted in a fixed leg 41 integral with the tip of the jack arm 30, and a grounding plate 43 at the lower end of the movable leg 42. Is provided. In the support leg 40, a piston rod 45 having a piston 44 fixed to the lower end is fixed vertically. The piston 44 is slidably fitted in a cylinder hole in the movable leg portion 42. The inside of the cylinder hole is divided into an upper oil chamber a and a lower oil chamber b by a piston 44. Two oil passages 46 and 47 are formed in the piston rod 45. The lower end of one oil passage 46 communicates with the upper oil chamber a, and the lower end of the other oil passage 47 communicates with the lower oil chamber b. Is done. The upper ends of the two oil passages 46 and 47 are connected to the hydraulic hoses 46h and 47h via supply / discharge ports opened at the upper end of the piston rod 45, respectively. The hydraulic hoses 46h and 47h are guided by a guide roller 48 provided at the front portion of the jack arm 30, pass through the jack arm 30, and are connected to a conventionally known hydraulic circuit. A switching control valve v and a hydraulic pump p are connected to the hydraulic circuit, and by the switching control of the switching control valve v, pressure oil is selectively supplied to the upper and lower oil chambers a and b to expand and contract the support leg 40. Can do.

  Next, the operation of this embodiment will be described.

  In FIG. 7, when the hydraulic motor M is driven forward (counterclockwise), the first chain mechanism C1 is operated. That is, the first drive sprocket 51 is rotationally driven counterclockwise, the first endless chain 53 is driven to travel in the direction of arrow A, and the first driven sprocket 52 is also rotationally driven counterclockwise. . The bracket 54 attached to the first endless chain 53 moves leftward (outward), and the inner arm 20 fastened thereto moves leftward (outward) with respect to the outer arm 10. , Extended outward and stretched.

  As the inner arm 20 moves in the left direction, the interlocking sprocket 70 connected to the inner arm 20 also moves in the left direction. The interlocking sprocket 70 is rotated counterclockwise by meshing with the first endless chain 53, whereby the second drive sprocket 61 integral with the interlocking sprocket 70 is also rotated counterclockwise. The second chain mechanism C2 is driven. As a result, the second endless chain 63 is driven to run in the direction of arrow B, and the jack arm 30 fastened to the bracket 64 attached thereto via the connecting member 34 moves to the left and is extended. The

  By the way, the interlocking sprocket 70 constituting the speed increasing mechanism SU is counterclockwise by meshing with the first endless chain 53 of the first chain mechanism C1 while moving in the same direction as the inner arm 20 moves in the left direction. By rotating in the direction, the second drive sprocket 61 integral with the interlocking sprocket 70 is driven at a speed higher than that of the first drive sprocket 51, whereby the first endless shape of the first chain mechanism C1. The traveling speed of the second endless chain 63 of the second chain mechanism C2 becomes faster than the traveling speed of the chain 53, and the jack arm 30 projects outward faster than the inner arm 20. .

  2 and 3, when the telescopic arm is extended, the overlap margin L1 between the outer arm 10 and the inner arm 20 can be made larger than the overlap margin L2 between the inner arm 20 and the jack arm 30. It is possible to increase the durability against the bending moment of the telescopic arm and to project the telescopic arm accurately, stably and safely.

  When the hydraulic motor is driven in reverse (FIG. 7, clockwise), the telescopic arm is retracted and retracted as shown in FIG. The

  As mentioned above, although embodiment of this invention was described, this invention is not limited to that embodiment, A various embodiment is possible within the scope of the present invention.

  For example, in the above-described embodiment, the case where the device of the present invention is implemented in a concrete pump vehicle has been described, but it is needless to say that this can also be implemented in other work vehicles such as a crane vehicle. Are composed of one outer arm, inner arm and jack arm, but a plurality of inner arms may be provided.

1 ... Body frame 10 ... Outer arm 20 ... Inner arm 30 ... Jack arm 40 ... .... Support legs (jack)
51 ..... Sprocket (first drive sprocket)
52 ..... Sprocket (first driven sprocket)
53... First endless chain 61.
62... Sprocket (second driven sprocket)
63 ... 2nd endless chain 70 ... Interlock sprocket C1 ... Chain mechanism (first chain mechanism)
C2 ..... Chain mechanism (second chain mechanism)
M: Drive source (hydraulic motor)
SU ... Speed increasing mechanism

Claims (3)

An outer arm (10) supported by the vehicle body frame (1), an inner arm (20) slidably fitted to the outer arm (10), and a jack slidably fitted to the inner arm (20) An arm (30), a support leg (40) provided at the tip of the jack arm (30), a single drive source (M) supported by the outer arm (10), the outer arm (10), The chain mechanism (C1, C2) is spanned between the inner arm (20) and the jack arm (30) and driven by the drive source (M).
The chain mechanism (C1, C2)
A pair of sprockets (51, 52) pivotally supported by the outer arm (10) and a first endless chain (53) wound between the sprockets (51, 52); A first chain mechanism (C1) in which one of the first end (51) is connected to the drive source (M) and an intermediate part of the first endless chain (53) is fastened to the inner arm (20);
A pair of sprockets (61, 62) pivotally supported by the inner arm (20), and a second endless chain (63) wound between the sprockets (61, 62), A second chain in which one of the sprockets (61) is interlocked with the first endless chain (53) and an intermediate portion of the second endless chain (63) is fastened to the jack arm (30). Mechanism (C2);
A support leg actuating device for a work vehicle.     The first endless chain (53) of the first chain mechanism (C1) is transferred to the second endless chain (63) of the second chain mechanism (C2) via a speed increasing mechanism (SU). 2. The support leg actuating device for a work vehicle according to claim 1, wherein the support leg actuating device is interlocked.   The speed increasing mechanism (SU) is connected to the first sprocket mechanism (C1) of the first chain mechanism (C1) by an interlocking sprocket (70) that can rotate integrally with one sprocket (62) of the second chain mechanism (C2). The support leg actuating device for a work vehicle according to claim 2, wherein the endless chain (53) is engaged.

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