JP2021173287A - Detent device for rotation axis - Google Patents

Abstract

To provide a detent device for a rotation axis suitable for detent of an outrigger rotation axis when using the outrigger rotation axis as a fixed axis and a device such as a position sensor is installed on an axis identical to the outrigger rotation axis.SOLUTION: There is provided a detent device for a rotation axis in which a frame and an outrigger rotation axis 15 interlock each other by inserting a detent member 1 into an attachment hole 13Hm and a fitting hole 15H in a state where the attachment hole 13Hm and the fitting hole 15H are communicated with each other. The detent member 1 is configured so that an axis member 4 can be moved by elastic deformation of an elastic member 3 constituting an intermediate part sandwiched between a fixed member 2 constituting a base end side and the axis member 4 constituting a tip side. The axis member 4 is always engaged with the fitting hole 15H even when the elastic member 3 is being compressed. The fitting hole 15H has a bottom surface formed into a cone shape, and a tip part of the axis member 4 is formed into a taper shape along the cone shape.SELECTED DRAWING: Figure 7

Description

The present invention relates to a detent device for a rotating shaft.

As an example of using the rotation stop device of the rotating shaft, for example, there is a technique disclosed in Patent Document 1. In the technique disclosed in Patent Document 1, as a technique relating to the mounting configuration of outriggers for working machines, outriggers that can rotate around the vertical axis are attached to the four corners of the upper surface of the traveling body frame of the crane, and further, brackets are used. The outriggers are attached to the rotating shaft via.

Japanese Unexamined Patent Publication No. 2019-11214

By the way, taking the technique disclosed in Patent Document 1 (for example, FIG. 2) as an example, if the detent device for the outrigger rotating shaft is installed on the bracket side of the outrigger, the outrigger is rotated. At that time, the outrigger rotation shaft rotates together with the outriggers. In such a case, as in Patent Document 1, it is not possible to detect the rotation angle of the outrigger by providing a position sensor such as a potentiometer coaxially with respect to directly above the outrigger rotation axis.
That is, in order to have such a configuration, the outrigger rotation shaft needs to be provided with a detent at a portion that does not rotate together with the outrigger bracket, and the outrigger must be rotated independently of the outrigger rotation shaft.

Therefore, it is assumed that a side locking type detent is provided on the shaft portion of the outrigger rotation shaft so that the set screw can be penetrated from the side surface direction of the frame.
In this case, the grounding reaction force received by the grounding portion of the outrigger is transmitted to the bracket of the outrigger during the crane operation of lifting the suspended load with the hook suspended from the tip of the boom. Since the bracket is axially attached to the frame via the out-trigger rotation shaft, the twist generated between the out-trigger rotation shaft and the frame due to the action of the ground reaction force acts as a shearing force received by the set screw. As a result, there is a problem that the turning member is damaged, such as the set screw and the screw thread being damaged.

Therefore, the present invention has focused on such a problem, and provides a rotation shaft detent device suitable for fixing the rotation shaft to the frame from the outer peripheral surface side to prevent rotation. The task is to do.

In order to solve the above problems, the rotation stopper according to an embodiment of the present invention has a rotation shaft, a base member having a shaft hole through which the rotation shaft is inserted, and a rotation shaft inserted into the shaft hole. It is provided on a work machine equipped with a bracket that is rotatably attached to the shaft. Further, in the rotation stopper of the rotating shaft, the foundation member and the rotating shaft are locked to each other by inserting the rotation stopper into the mounting hole and the fitting hole in a state where the mounting hole and the fitting hole are communicated with each other. .. The mounting hole is formed so as to penetrate from the outer surface of the foundation member to the shaft hole so that the central axis is orthogonal to the center axis of the shaft hole. The fitting hole is formed on the side surface of the rotating shaft so that the central axis is orthogonal to the central axis of the rotating shaft. The stop member is an elastic portion formed of a fixing member constituting the base end side of the stop member, a shaft member forming the tip end side of the stop member, and an intermediate portion sandwiched between the fixing member and the shaft member. Each has a member. Further, the turning member is configured so that the shaft member can move due to the elastic deformation of the elastic member, and the shaft member is always engaged with the fitting hole even when the elastic member is in the compressed state. Further, the fitting hole has a bottom surface formed in a conical shape, and the tip portion of the shaft member is formed in a tapered shape along the conical shape.

According to the present invention, it is possible to prevent or reduce damage to the rotating member due to the ground reaction force, while having a structure in which the rotating shaft such as the outrigger rotating shaft is prevented from rotating from the outer peripheral surface side of the rotating shaft. ..

It is a side view of the crane which concerns on 1st Embodiment. FIG. 5 is a plan view of the crane according to the first embodiment as viewed from above the vehicle. It is a partial perspective view which shows the rotation support part and the outrigger which concerns on 1st Embodiment. It is a vertical sectional view of FIG. It is a figure which shows the rotation stop member which concerns on 1st Embodiment. It is a partial cross-sectional view of the rotation support part and the base end side bracket which concerns on 1st Embodiment. It is a partial cross-sectional view of the rotation support part and the base end side bracket which concerns on 1st Embodiment. It is a top view for demonstrating the state which the outrigger rotation shaft is pressed against a frame by an elastic member. It is a side view for demonstrating the state which the outrigger rotation shaft is pressed against a frame by an elastic member. It is a top view for demonstrating the dimension of the main part with respect to the structure which can allow tilting of an outrigger rotation shaft. It is a side view for demonstrating the dimension of the main part with respect to the structure which can allow tilting of an outrigger rotation shaft. It is a top view for demonstrating the state in which the shaft member is tilted along the axial direction with respect to the outrigger rotation shaft. It is a side view for demonstrating the state in which the shaft member is tilted along the axial direction with respect to the outrigger rotation shaft. It is a top view for demonstrating the state which the tilt occurred in the direction orthogonal to the axial direction of the shaft member with respect to the outrigger rotation shaft. It is a top view for demonstrating the state in which the rotational force is generated around the axis of the outrigger rotation axis with respect to the outrigger rotation axis. It is a figure which shows the modification of the rotation stop member. FIG. 16 is a cross-sectional view taken along the line XVII-XVII of FIG. It is a side view of the crane which concerns on 2nd Embodiment. It is a partial perspective view which shows the rotation support part and the outrigger which concerns on 2nd Embodiment. FIG. 19 is a cross-sectional view taken along the line XX-XX of FIG. It is a partial cross-sectional view of the rotation support part and the base end side bracket which concerns on 2nd Embodiment. It is a partial cross-sectional view of the rotation support part and the base end side bracket which concerns on 2nd Embodiment.

Hereinafter, an embodiment of the rotation shaft detent device according to the present invention will be described with reference to the drawings as appropriate. The drawings are schematic. Therefore, it should be noted that the relationship, ratio, etc. between the thickness and the plane dimension may differ from the actual one, and there are parts where the relationship and ratio of the dimensions are different between the drawings. In some cases. In addition, in order to make it easier to understand the positional relationship of each component, a portion that is originally invisible may be displayed transparently. In addition, the embodiments shown below exemplify devices and methods for embodying the technical idea of the present invention, and the technical idea of the present invention describes the material, shape, structure, and arrangement of constituent parts. Etc. are not specified in the following embodiments.

(First Embodiment)
Hereinafter, the first embodiment of the rotation stopper for the rotating shaft according to the present invention will be described.
(composition)
As shown in FIG. 1, the crane 100 (working machine) according to the first embodiment of the present invention includes a chassis frame (hereinafter, abbreviated as “frame 101”), a crane device 102, a traveling device 103, and 4 It includes a base outrigger 104. In addition to this, the crane 100 includes a driving unit 105, a control box 106, a crane operating unit 107, a traveling operation unit 108, and a lock pin 109. Note that FIG. 1 shows two outriggers 104 out of the four outriggers 104.

The frame 101 includes four rotation support portions 10. Here, the frame 101 and the four rotation support portions 10 are collectively defined as a foundation member.
Each rotation support portion 10 is configured to rotatably support one outrigger 104. Further, each rotation support portion 10 is provided for each mounting position of the four outriggers 104 set on the upper part of the frame 101.
The crane device 102 includes a column 120, a boom 121, a wire rope 122, and a hook 123.
The column 120 is rotatably attached to the upper part of the frame 101.
The boom 121 is telescopic and is undulatingly attached to the upper end of the column 120.

The wire rope 122 is unwound from a winch (not shown) and guided to the tip of the boom 121. Further, the end of the wire rope 122 is fixed to the hook 123 via a sheave (not shown). The sheave is provided inside at the tip of the boom 121. As a result, the hook 123 is suspended from the tip of the boom 121.
The traveling device 103 is, for example, a crawler type traveling device in which rubber tracks are attached to the left side and the right side along the vehicle width direction. Further, the traveling device 103 is provided at the lower part of the frame 101.

Each of the four outriggers 104 is provided at the four corners behind the prime mover 105 at the upper part of the frame 101. Each outrigger 104 is configured to be operable in the retracted posture shown in FIG. 1 and the overhanged posture shown in FIG. Therefore, FIG. 1 shows a state in which the outrigger 104 is stored. Further, FIG. 2 shows a state in which the outrigger 104 is deployed.
Further, each outrigger 104 includes a base end side bracket (outrigger base end side bracket) 41, a base end side arm 43, a tip end side bracket 44, and a tip end side arm 45. The base end side arm 43 is provided on the frame 101 so as to be rotatable and undulating via the base end side bracket 41. The tip end side arm 45 is a telescopic arm provided so as to be undulating with respect to the tip end end side arm 43 via the tip end side bracket 44.

Specifically, the tip end side bracket 44 is integrally fixed to the tip end portion of the proximal end side arm 43 with the tip end of the proximal end side arm 43. The tip side bracket 44 is formed by facing a pair of plates formed in a substantially triangular plate shape so as to face each other.
The tip end side arm 45 is attached so that the base end portion can rotate with respect to the corner portion of the tip end side bracket 44 (rotatable in either the forward direction or the reverse direction).
Further, as shown in FIGS. 3 and 4, the tip end side arm 45 has a square cylindrical outer box 46 and a square tubular inner box 47. The inner box 47 is housed in the outer box 46 so as to be expandable and contractable along the longitudinal direction of the outer box 46. A float 48 is attached to the tip of the inner box 47 so as to be rotatable around a horizontal axis.

Further, each outrigger 104 includes an outrigger cylinder 50, as shown in FIGS. 1 to 4. The outrigger cylinder 50 is a hydraulic actuator for undulating the base end side arm 43.
Here, one end and the other end of the outrigger cylinder 50 are rotatably attached to the upper portion of the base end side bracket 41 and the corner portion of the tip end side bracket 44 on the rotation support portion 10 side. By expanding and contracting the outrigger cylinder 50, it is possible to perform an overhanging operation when the outrigger 104 is in contact with the ground and a housing operation when the outrigger 104 is retracted.

Although not shown, the driving unit 105 includes an engine, a pressure oil supply device, and a control valve housed inside the housing. The pressure oil supply device is driven by using an engine as a drive source. The control valve switches and controls the oil passage of the pressure oil supplied from the pressure oil supply device.
The crane operation unit 107 is provided at the front end portion of the crane 100, and has a plurality of operation switches and a plurality of operation levers. The operation switch and the operation lever are arranged near the control box 106.
The traveling operation unit 108 is provided at the rear end of the crane 100, and has a pair of left and right traveling operation levers.
The operation lever and the travel operation lever are provided corresponding to various hydraulic actuators, and the operation lever and the hydraulic actuator corresponding to the travel operation lever can be driven in the direction of tilting from the neutral position.

When using the crane device 102, first, the operator manually pulls out the lock pin 109 for each outrigger 104 constrained by the lock pin 109 at the rotational position when it is retracted, so that the restraint can be released and the outrigger device 102 can rotate. Make it a state. Subsequently, by manually rotating the outriggers in the horizontal direction, as shown in FIG. 2, the entire outriggers 104 are arranged at various overhang positions (rotation angle positions) with respect to the frame 101.
Next, as shown in FIG. 2, the operator inserts the lock pin 109 into the corresponding fixing pin hole at a desired angle position from a plurality of rotation angle positions corresponding to the preset overhanging postures. To fix the rotation position. The plurality of rotation angle positions are, for example, five types of positions on the front side and six types of positions on the rear side. Further, the desired angular position is, for example, a position in consideration of an obstacle at the work site.

Next, the lock pin 44a is pulled out, the tip end side arm 45 is rotated in the vertical direction, and then the lock pin 44a is inserted and fixed. Subsequently, the lock pin 46a is pulled out, the inner box 47 is pulled out and extended, and then the lock pin 46a is inserted and fixed. Further, by operating the crane operation unit 107 or the remote control device (not shown), each outrigger cylinder 50 is driven to operate the base end side arm 43 of each outrigger 104 in the down direction, and the float 48 is grounded. As a result, the crane 100 is stabilized during work (during suspension).

Further, the crane 100 includes a hydraulic actuator for turning the column 120, expanding and contracting the boom 121, hoisting and lowering the winch, and raising and lowering the boom 121.
That is, although not shown, the crane 100 includes, as hydraulic actuators, a hydraulic motor for turning, a hydraulic cylinder for expanding and contracting the boom, a hydraulic motor for winches, and a hydraulic cylinder for raising and lowering the boom. Further, the crane 100 includes a traveling motor as a hydraulic actuator for driving the traveling device 103.
The hydraulic actuator included in the crane 100 operates by supplying pressure oil from the pressure oil supply device via a control valve. In addition, each outrigger cylinder 50 operates by supplying pressure oil from the pressure oil supply device via a control valve.

Returning to FIG. 1, the control box 106 includes a controller (not shown) inside. Operation signals from the crane operation unit 107 and the traveling operation unit 108, remote control signals from the remote control device, switching position signals from various switching control valves, detection signals from various detectors, etc. are input to the controller. ..
Then, the controller operates and controls various electric devices such as an oil passage switching solenoid valve included in the crane 100 according to the input signal.

(Structure of rotation support portion 10)
Next, a detailed configuration of the rotation support portion 10 will be described with reference to FIGS. 1, 3 and 4.
As shown in FIGS. 3 and 4, the rotation support portion 10 includes an upper frame portion 11, an intermediate frame portion 12, and a lower frame portion 13.
The upper frame portion 11 is formed in a relatively thick substantially columnar shape. Further, although not shown, the upper frame portion 11 is provided with a plurality of pin holes (hereinafter, referred to as “fixing holes”) used for fixing the overhanging position so as to penetrate in the vertical direction.
The intermediate frame portion 12 is formed in a relatively thin substantially disk shape. The lower frame portion 13 has a wall thickness similar to that of the upper frame portion 11 and is formed in a substantially triangular columnar shape.

The upper frame portion 11, the intermediate frame portion 12, and the lower frame portion 13 are vertically stacked with the intermediate frame portion 12 arranged between the upper frame portion 11 and the lower frame portion 13. Further, the upper frame portion 11, the intermediate frame portion 12, and the lower frame portion 13 are formed with shaft holes 11H, 12H, and 13H that communicate with each other in the vertical direction, respectively.
The outrigger rotation shaft 15 is formed in a columnar shape. Further, the outrigger rotation shaft 15 is inserted into the shaft holes 11H to 13H in the state where the outrigger 104 is mounted, and is fixed to the frame 101 via the rotation stop member 1 and the lower frame portion 13. The details of the structure of the rotation shaft detent device for detenting the outrigger rotation shaft 15 will be described later.

(Structure of base end side bracket 41)
Next, a detailed configuration of the base end side bracket 41 will be described with reference to FIGS. 3 and 4.
As shown in FIGS. 3 and 4, the base end side bracket 41 includes an upper plate 41a, a lower plate 41b, a connecting portion 41c, and a pair of support plates 41d. The upper plate 41a, the lower plate 41b, and the connecting portion 41c are formed in a substantially C shape in a side view.
The upper plate 41a and the lower plate 41b have a shaft hole 41H1 and a shaft hole 41H2. The shaft holes 41H1 and the shaft holes 41H2 penetrate through the shaft holes 41H1 and the shaft holes 41H2 at positions that communicate coaxially with the shaft holes 11H to 13H in a state where the outriggers 104 are mounted on the frame 101 via the rotation support portion 10.

Further, the upper plate 41a is provided with a plurality of fixing holes 41Hr used for fixing the overhanging position. Then, one of the plurality of fixing holes 41Hr and one of the plurality of fixing holes provided in the rotation support portion 10 are coaxially aligned, and the lock pin 109 is rotationally supported with the fixing hole 41Hr. Insert it into the fixing hole of the part 10. As a result, the overhanging position (rotational position) of the outrigger 104 is fixed.
The connecting portion 41c connects the end portion of the upper plate 41a on the proximal end side arm 43 side and the end portion of the lower plate 41b on the proximal end side arm 43 side. Further, the connecting portion 41c supports the lower plate 41b from below. Further, a proximal end portion of the proximal end side arm 43 is rotatably attached to the proximal end side arm 43 side of the connecting portion 41c.

The pair of support plates 41d are erected so as to face both ends in the left-right direction on the upper surface of the upper plate 41a when each outrigger 104 is in the retracted posture. Further, one end of the outrigger cylinder 50 is rotatably attached to the pair of support plates 41d.
Therefore, the crane 100, which is a working machine, includes a frame 101 having an outrigger rotation shaft 15 (rotation shaft) and shaft holes 11H to 13H through which the outrigger rotation shaft 15 is inserted. In addition to this, the crane 100, which is a working machine, includes a base end side bracket 41 which is a bracket rotatably attached to the frame 101 by inserting the outrigger rotating shaft 15 into the shaft holes 11H to 13H.

(Attachment configuration of outrigger 104)
Next, the mounting configuration of each outrigger 104 on the frame 101 will be described with reference to FIGS. 1, 3 and 4.
Each outrigger 104 is mounted on the frame 101 with the rotation support portion 10 sandwiched in the substantially C-shaped opening of the base end side bracket 41, that is, between the upper plate 41a and the lower plate 41b. Specifically, the outrigger rotating shaft 15 is inserted into the shaft holes 41H1 and 41H2 and the shaft holes 11H to 13H in a state where the shaft holes 11H to 13H and the shaft holes 41H1 and 41H2 are arranged so as to coaxially overlap each other. It is installed in the state that it is. The outrigger rotation shaft 15 is fixed to the frame 101 by a rotation prevention device for the rotation shaft, which will be described later. In this way, each outrigger 104 is mounted on the frame 101 so as to be rotatable around the axis of the outrigger rotation shaft 15 which is a fixed shaft.

That is, the lock pin 109 is manually removed by the operator, and the outrigger 104 is manually rotated in the horizontal direction so that the entire outrigger 104 can be rotated to a laterally protruding position of the frame 101. Then, by inserting the lock pin 109 into the fixing hole at the overhanging position, the overhanging position of the outrigger 104 is surely fixed. That is, from the retracted posture shown in FIG. 1, the outrigger 104 is manually rotated in the horizontal direction by the operator to reach one of a plurality of overhanging positions toward the side of the frame 101 as shown in FIG. , The outrigger 104 is configured to be positioned.

(Structure of rotation stop device for rotating shaft)
Next, the structure of the rotation stop device for the rotating shaft will be described with reference to FIGS. 5 to 8.
First, the detailed configuration of the turning member 1 will be described.
As shown in FIG. 5, the turning member 1 includes a fixing member 2, an elastic member 3, and a shaft member 4.
The fixing member 2 constitutes the base end side of the rotation stop member 1, and is composed of a hexagonal holed plug provided with a hexagonal hole 2H. The hexagonal hole 2H is a hole arranged in the center on one end surface of the fixing member 2 and having a hexagonal shape and a bottom surface when viewed from the axial direction of the fixing member 2, and is formed along the axial direction of the fixing member 2. There is. Further, a male screw is formed on the outer peripheral portion of the fixing member 2.

The elastic member 3 is formed by superimposing a plurality of disc springs in a predetermined direction (for example, the direction shown in FIG. 5). In the example shown in FIG. 5, nine disc springs are superposed to form the elastic member 3. In addition, the present invention is not limited to this configuration, and may be configured by another number of sheets according to the application target. Further, if a space can be secured, the elastic member 3 may be composed of springs other than disc springs such as coil springs, leaf springs, and spiral springs.
Therefore, the elastic member 3 constitutes an intermediate portion sandwiched between the fixing member 2 and the shaft member 4 inside the mounting hole 13Hm described later.

The shaft member 4 constitutes the tip end side of the rotation stop member 1, and is composed of a substantially columnar metal member having substantially the same diameter as the disc spring constituting the elastic member 3. The tip of the shaft member 4 is formed in a conical shape (conical cone shape). That is, a taper 4T is formed on the tip of the shaft member 4 over the entire circumference. Further, on the base end surface of the shaft member 4, a punched tap hole 4H having a bottom surface is formed in the center along the axial direction of the shaft member 4. The punch tap hole 4H is a hole for screwing a jig and pulling out the shaft member 4. A female screw (not shown) is formed on the inner diameter surface of the punched tap hole 4H. That is, the shaft member 4 is formed with a punched tap hole 4H opened on the surface of the shaft member 4 facing the fixing member 2.

On the other hand, as shown in FIG. 6, a mounting hole 13Hm for mounting the turning member 1 is provided on the side surface of the lower frame portion 13 so as to penetrate from the outer surface to the inner shaft hole 13H. As a specific forming position of the mounting hole 13Hm, in the first embodiment, when the outrigger 104 is rotated by 90 °, the position of the lower frame portion 13 facing the base end side arm 43 of the outrigger 104 is set. explain. That is, in the first embodiment, the opening of the mounting hole 13 Hm is positioned so as to face directly to the side of the machine body. Further, a female screw (not shown) for screwing the fixing member 2 is formed on the inner peripheral portion of the outer end portion of the mounting hole 13 Hm.
That is, the mounting hole 13Hm is formed so as to penetrate from the outer surface of the lower frame portion 13 to the inner shaft hole 13H so that the central axis of the mounting hole 13Hm is orthogonal to the central axis of the shaft hole 13H.

Further, on the side surface of the outrigger rotation shaft 15, a fitting hole 15H having a bottom surface that is coaxial with and communicates with the mounting hole 13Hm is formed at a position facing the mounting hole 13Hm of the lower frame portion 13. Note that FIG. 6 shows a state before the turning member 1 is inserted into the mounting hole 13Hm and the fitting hole 15H. The end portion on the back side (bottom side) of the fitting hole 15H is formed in a conical shape. That is, the fitting hole 15H has a taper 15T formed over the entire circumference at the end on the back side. Here, the taper 4T of the shaft member 4 is configured to have an inclined shape along the taper 15T.
Therefore, the fitting hole 15H has a conical bottom surface. Further, the tip portion of the shaft member 4 is formed in a tapered shape along the conical shape of the fitting hole 15H.
Further, the fitting hole 15H is formed on the side surface of the outrigger rotating shaft 15 so that the central axis of the fitting hole 15H is orthogonal to the central axis of the outrigger rotating shaft 15.

Then, as shown in FIGS. 6 and 7, first, the shaft member 4 constituting the rotation stop member 1 is inserted into the mounting hole 13Hm using, for example, a jig, and the tip end side of the shaft member 4 is fitted. It fits into the hole 15H. Next, the elastic member 3 is inserted into the mounting hole 13 Hm. Note that FIG. 7 shows a state after the turning member 1 is inserted into the mounting hole 13Hm and the fitting hole 15H. Then, the fixing member 2 is screwed into the female screw of the mounting hole 13 Hm using a tool such as a hexagon wrench. As a result, the shaft member 4 is pushed toward the tip end via the elastic member 3, and the taper 4T comes into contact with the taper 15T. As a result, the lower frame portion 13 and the outrigger rotation shaft 15 are connected to each other via the rotation stop member 1.

That is, the fixing member 2 is fixed to the foundation member in a state where the elastic member 3 is pressed against the shaft member 4.
In this state, the fixing member 2 is fixed to the lower frame portion 13 by screwing, but the elastic member 3 and the shaft member 4 are in a state where they can slide inside the mounting hole 13Hm. In addition, the shaft member 4 is in a slidable state with respect to the fitting hole 15H. On the other hand, when the fixing member 2 is screwed in, the elastic member 3 is in a compressed state, and the elastic force generated by the compression of the elastic member 3 is applied to the tip end surface of the fixing member 2 and the base end surface of the shaft member 4. ..

As a result, as shown in FIGS. 8 and 9, the elastic force generated by the elastic member 3 applies an urging force (indicated by a white arrow in the figure) to the shaft member 4, so that the slidable shaft member 4 Is pressed toward the tip side, and the outrigger rotation shaft 15 is pressed from the side surface. Further, when the shaft member 4 presses the outrigger rotating shaft 15 from the side surface, as shown in FIG. 9, the shaft member 4 is pushed downward by receiving the own weight of the outrigger rotating shaft 15. Therefore, the portion of the shaft member 4 remaining in the mounting hole 13Hm comes into contact with the inner diameter surface of the mounting hole 13Hm.

As a result, as shown in FIGS. 8 and 9, of the outer peripheral surfaces of the outrigger rotating shaft 15, the outer peripheral surface on the opposite side of the fitting hole 15H is pressed against the inner diameter surface of the shaft hole 13H.
Therefore, the rotation stop device for the rotating shaft rotates the frame 101 and the outriggers by inserting the rotation stop member 1 into the mounting hole 13Hm and the fitting hole 15H in a state where the mounting hole 13Hm and the fitting hole 15H are communicated with each other. The shaft 15 and the shaft 15 are locked to each other.
As described above, in the first embodiment, the outrigger rotation shaft 15 rotation stop device is configured by the rotation stop member 1, the frame 101, the mounting hole 13Hm, the outrigger rotation shaft 15, and the fitting hole 15H.

(Action and effect of the first embodiment)
(1) The frame 101 and the outrigger rotation shaft are provided by inserting the stop member 1 into the mounting hole 13Hm and the fitting hole 15H in a state where the mounting hole 13Hm and the fitting hole 15H are communicated with each other provided in the crane 100. 15 and 15 lock each other. Further, the turning member 1 is located between the fixing member 2 forming the base end side of the turning member 1, the shaft member 4 forming the tip end side of the turning member 1, and the fixing member 2 and the shaft member 4. Each has an elastic member 3 constituting a sandwiched intermediate portion.
Further, the shaft member 4 is configured to move by elastic deformation of the elastic member 3, and the shaft member 4 is always engaged with the fitting hole 15H even when the elastic member 3 is in a compressed state. In addition to this, the fitting hole 15H has a conical bottom surface, and the tip of the shaft member 4 is tapered along the conical shape of the fitting hole 15H.
With this configuration, the frame 101 and the outrigger rotation shaft 15 can be connected to each other via the rotation stop member 1 on the outer peripheral surface side of the outrigger rotation shaft 15. As a result, the out-trigger rotation shaft 15 can be stopped from rotating from the outer peripheral surface side of the out-trigger rotation shaft 15, and as shown in FIG. 7, the out-trigger rotation shaft 15 is displaced in the axial direction (painted in black in FIG. 7). (Displacement in the direction of the up and down arrows) can also be stopped.

In addition to this, since it is not necessary to provide detent members at the upper and lower ends of the outrigger rotating shaft 15, devices such as sensors can be easily installed at the upper and lower ends of the outrigger rotating shaft 15. .. In the first embodiment, as shown in FIG. 4, the potentiometer 200 is installed coaxially with the outrigger rotation shaft 15 at the upper end of the outrigger rotation shaft 15. The potentiometer 200 is a detector for detecting the rotational position of each outrigger 104. The rotor of the potentiometer 200 is attached to the out trigger 104 so that the rotor can move in the radial direction and the axial direction, and the rotor of the potentiometer 200 rotates with the rotation of the out trigger 104. This makes it possible to detect the rotation angle of the outrigger 104.

Further, by making the shaft member 4 movable, it is possible to release the ground contact reaction force received from the ground when the outrigger 104 touches the ground to the frame 101 side. That is, when the out-trigger rotation shaft 15 is tilted due to a large load due to the ground reaction force, the shaft member 4 is pushed by the out-trigger rotation shaft 15 to make a stroke, so that the frame 101 receives a large load applied to the out-trigger rotation shaft 15. It becomes possible. Therefore, the shaft member 4 is not damaged by the force exerted on the shaft member 4 by the large load due to the ground contact reaction force when the outrigger 104 is extended.
This makes it possible to protect the shaft member 4 from a large load applied to the outrigger rotating shaft 15. As a result, it is possible to prevent or reduce damage to the turning member 1 and the screw thread due to the ground reaction force.

The force acting on the outrigger rotation shaft 15 has a magnitude relationship of the first acting force <the second acting force. The first acting force is the urging force of the elastic member 3, and the outrigger rotating shaft 15 can be pressed against the inner diameter surface of the shaft hole 13H. Thereby, it is possible to reduce the rattling in the radial direction of the outrigger rotating shaft 15 due to the difference between the outer diameter of the outrigger rotating shaft 15 and the inner diameter of the shaft hole 13H. The second acting force is a force that acts in a state where the outrigger 104 is installed and the vehicle body of the crane 100 is lifted, and the suspended load is lifted by the crane device 102 while working.

Further, since the tip of the shaft member 4 has a truncated cone shape, when the shaft member 4 is fitted and inserted into the fitting hole 15H, the centering function by the taper 4T works, and the shaft member 4 is fitted into the fitting hole 15H. It can be easily inserted and inserted inside. In addition, since the taper 15T is also provided on the fitting hole 15H side, the centering function also works on the fitting hole 15H, and it is possible to reduce the rattling around the outrigger rotation shaft 15.
Further, since the shaft member 4 can be moved by the stroke of the elastic member 3, the out-trigger rotation occurs when an external force exceeding the elastic force generated by the compression of the elastic member 3 is applied to the out-trigger rotation shaft 15. It is possible to allow the shaft 15 to tilt.

Hereinafter, a configuration capable of allowing the outrigger rotation shaft 15 to be tilted will be specifically described with reference to FIGS. 1 to 9 and FIGS. 10 to 15. In the following description, as shown in FIGS. 10 and 11, the inner diameter of the mounting hole 13Hm is "φDh", the inner diameter of the fitting hole 15H is "φDp", the inner diameter of the shaft holes 11H to 13H is "φDs", and the out-trigger rotation. The diameter of the shaft 15 may be described as “φds”, and the diameter of the shaft member 4 may be described as “φdp”. Similarly, in the following description, the average value of the gaps formed between the shaft holes 11H to 13H and the outrigger rotation shaft 15 may be described as "δs". In addition to this, the average value of the gap formed between the shaft member 4 and the fitting hole 15H is "δp", and the average value of the gap formed between the shaft member 4 and the mounting hole 13Hm is "δh". May be described as. Further, in the following description, the total length, which is the total value of the lengths of the upper frame portion 11, the intermediate frame portion 12, the lower frame portion 13, and the outrigger rotation shaft 15 along the axial direction, is referred to as “L”. May be described. The average value δs of the gap is a value obtained by the formula (φDs−φds) / 2. The average value δp of the gap is a value obtained by the formula (φDp−φdp) / 2. The average value δh of the gap is a value obtained by the formula (φDh−φdp) / 2.

First, a case where the outrigger rotating shaft 15 is tilted along the axial direction (“axial direction” shown in FIG. 12) of the shaft member 4 will be described with reference to FIGS. 12 and 13. In the following description, as shown in FIGS. 12 and 13, the outrigger rotation shaft 15 is tilted along the axial direction of the shaft member 4, and the outrigger rotation shaft 15 is the upper frame portion 11 and the lower frame portion. The case of contacting 13 will be described. Further, in the following description, it is premised that the total amount of deflection of the elastic member 3 is larger than the gap (2δs) obtained by subtracting the diameter (φds) of the outrigger rotating shaft 15 from the inner diameter (φDs) of the shaft hole 13H. do. Further, in FIGS. 12 and 13, as in FIGS. 8 and 9, the urging force applied to the shaft member 4 by the elastic force generated by the elastic member 3 is indicated by a white arrow.

Further, in the following description, a gap (average value δh of the gap) formed between the shaft member 4 and the mounting hole 13Hm and a gap (gap) formed between the shaft member 4 and the fitting hole 15H. It is assumed that the total with the average value δp) exceeds the gap (average value δs of the gap) formed between the outrigger rotation shaft 15 and the shaft holes 11H to 13H. Therefore, in the following description, it is assumed that δh + δp> δs.
When the shaft member 4 is tilted with respect to the outrigger rotating shaft 15 along the axial direction, the shaft member 4 sinks due to the displacement of the elastic member 3, and the outrigger rotating shaft 15 is moved to the lower frame portion 13. Contact. Therefore, the force applied to the outrigger rotation shaft 15 is received by the lower frame portion 13.

When the outrigger rotating shaft 15 is tilted along the axial direction of the shaft member 4, the following conditional expressions (1) to (4) are satisfied, and the outrigger rotating shaft 15 comes into contact with the lower frame portion 13. ..
δe ≒ 2δs ... (1)
θ = tan ^-1 (δe / L) ≒ tan ^-1 (2δs / L)… (2)
φDp'= φDpcosθ… (3)
φDp'> φdp… (4)

“2δs” in the conditional expression (1) has the same value as the above-mentioned 2δs. Similarly, “δe” in the conditional expression (1) is the gap between the inner diameter (φDs) of the shaft hole 13H and the gap along the lower surface of the lower frame portion 13 when the outrigger rotation shaft 15 is tilted, as shown in FIG. The length.
As shown in FIG. 13, "φDp'" in the conditional expressions (3) and (4) is the inner diameter of the fitting hole 15H in the state where the outrigger rotation shaft 15 is tilted in the axial direction of the outrigger rotation shaft 15. It is the length along.
In the general structure, since the conditional expression of "2δs <<L" is satisfied, "θ" is a minute value in the conditional expression (2). Therefore, in the conditional expression (3), the relationship of "φDp'≈φDp" is established, and the conditional expressions (1) to (4) are established.

Next, using FIG. 14, the direction along the direction orthogonal to the axial direction of the shaft member 4 (“orthogonal direction” shown in FIG. 14) with respect to the out trigger rotating shaft 15 when viewed from the axial direction of the out trigger rotating shaft 15. A case where tilt occurs will be described. In FIG. 14, as in FIGS. 8 and 9, the urging force applied to the shaft member 4 by the elastic force generated by the elastic member 3 is indicated by a white arrow.
When the outrigger rotation shaft 15 is tilted along the orthogonal direction, a part of the outrigger rotation shaft 15 comes into contact with the lower frame portion 13 as shown in FIG. 14 from the above-mentioned precondition of "δh + δp>δs". do.
Further, although not shown, a part of the outrigger rotation shaft 15 comes into contact with the upper frame portion 11. Therefore, the force applied to the outrigger rotation shaft 15 is received by the upper frame portion 11 and the lower frame portion 13.

Next, a case where a rotational force is generated around the outrigger rotation shaft 15 with respect to the outrigger rotation shaft 15 will be described with reference to FIG. In FIG. 15, as in FIGS. 8 and 9, the urging force applied to the shaft member 4 by the elastic force generated by the elastic member 3 is indicated by a white arrow.
Due to the rotation of the outrigger rotating shaft 15, the shaft member 4 is pushed by the outrigger rotating shaft 15 and comes into contact with the inner diameter surface of the mounting hole 13Hm and the inner diameter surface of the fitting hole 15H. As a result, the shaft member 4 is in a state of receiving a shearing force from the lower frame portion 13 and the outrigger rotating shaft 15.

By the way, the force for rotating the out-trigger rotation shaft 15 around the shaft is the base end side bracket 41 and the out-trigger rotation shaft 15 when the base end side bracket 41 rotates around the out-trigger rotation shaft 15 of the out-trigger rotation shaft 15. Is generated by the frictional force (sliding frictional force) applied to the sliding part.
Further, since a lubricant such as grease or oil is usually applied when the outrigger rotating shaft 15 is attached and inserted, the sliding friction force is reduced by the lubricant.
As a result, the sliding friction force is smaller than the force that can be withstood by the strength of the shaft member 4, so that the above-mentioned shearing force is a force of a magnitude that can be received by the shaft member 4.

As described above, even when the outrigger rotation shaft 15 is tilted, it is possible to receive a large load due to the ground contact reaction force when the outrigger 104 is extended by the shaft hole on the rotation support portion 10 side. Become. As a result, it is possible to prevent a large load from being applied to the turning member 1, so that it is possible to prevent or reduce damage to the threads formed in the turning member 1 and the mounting hole 13Hm. Become.
When, instead of the turning member 1, a rigid set screw in which the fixing member 2 and the shaft member 4 are integrated without using the elastic member 3 is used as the turning member that prevents the rotation of the outrigger rotating shaft. , The tip of the set screw cannot be moved. Therefore, the force cannot be released to the shaft hole (frame side) of the rotation support portion 10, and a large load due to the ground reaction force is applied to the tip of the set screw. As a result, problems such as damage to the set screw (including the screw thread) and the screw thread of the mounting hole may occur.

Further, in addition to the above-mentioned detenting device for the traveling body frame of the working machine and the rotating shaft of the rotatable outrigger, for example, the detenting device for a tool having a retainer device described in Japanese Patent Application Laid-Open No. 58-125626. Consider the case corresponding to. In the device, a ball for locking the punch shaft and a winding spring for urging the ball to the punch shaft are housed in an inclined hole provided in the housing.
With the retainer device having the above-mentioned structure, it is possible to fix the punch shaft and the housing by interposing a ball between the side surface of the punch shaft and the housing, but even in such a structure, it is possible to fix the punch shaft and the housing. , When used for the outrigger rotation shaft of a crane, the following problems occur.

A torsional force in the rotational direction and a resultant force of a thrust force and a torsional force are generated on the outtrigger rotating shaft 15 around the axis of the outtrigger rotating shaft 15.
If the center of the sphere does not bite into these forces until it penetrates deep inside from the shaft surface, the sphere will be pushed away by the torsional force acting on the outrigger rotation shaft 15, the sphere will come off, and the outtrigger rotation shaft 15 will rotate. Or it may come off. That is, when the ball is used to prevent the ball from coming off the shaft, there is a problem that the ball is not hooked on the shaft so much that a large retaining force is not generated. On the other hand, when it is desired to remove the outrigger rotation shaft 15, it becomes difficult to remove the ball.

In general, it is conceivable to use a special jig with a magnet to remove the ball, but at the site where the crane is used, the jig is not always available at the time of maintenance.
Here, in Japanese Patent Application Laid-Open No. 58-125626, there is a description that a narrow path inclined with respect to the boss is provided, and a thin bar is inserted into the path to remove the ball. However, in the configuration of Japanese Patent Publication No. 58-125626, if a potentiometer is provided directly above the outrigger rotation shaft, a small hole will not appear unless the potentiometer is removed, and the ball cannot be removed for maintenance. The sex is not good.

Further, in the configuration of Japanese Patent Application Laid-Open No. 58-125626, if the wall thickness of the frame around the shaft, which is the boss side of the outrigger rotation shaft, is not thick, a space for inserting a spring having a strong spring force can be taken. No. However, if the contraction distance of the spring cannot be provided, a disc spring may be used instead of the winding spring.
However, since a part of the sphere fits into the hole formed in the center of the disc spring, the disc spring may be slanted and fit. That is, when the ball is the opponent, the posture of the disc spring is not stable, so the problem is whether sufficient urging force can be obtained.
With respect to these problems, if the configuration of the first embodiment is used, it is possible to prevent or reduce damage to the stop member 1 and the screw thread.

(2) The shaft member 4 is formed with a punched tap hole 4H opened on a surface of the shaft member 4 facing the fixing member 2.
With this configuration, it is possible to pull out the shaft member 4 by screwing a jig into the pull-out tap hole 4H, and it is possible to improve workability such as maintenance.

(3) The fixing member 2 is fixed by being screwed to the lower frame portion 13 in a state where the elastic member 3 is pressed against the shaft member 4.
With this configuration, the out-trigger rotation shaft 15 can be pressed against the inner diameter surface of the lower frame portion 13 by the elastic force of the elastic member 3, so that rattling of the out-trigger rotation shaft 15 in the radial direction can be reduced. It is possible.

(4) The elastic member 3 is composed of a plurality of disc springs.
With this configuration, it is possible to reduce the space for installing the elastic member 3 as compared with the case where a coil spring or the like is adopted as the elastic member 3. As a result, the axial length of the turning member 1 can be shortened, and the amount of protrusion from the mounting hole 13Hm to the outside can be reduced. Even if the length of the stop member 1 in the axial direction is short, a sufficient urging force can be applied to the shaft member 4.

(5) The total of the gap formed between the shaft member 4 and the mounting hole 13Hm and the gap formed between the shaft member 4 and the fitting hole 15H is from the outrigger rotating shaft 15 and the shaft hole 11H. It exceeds the gap formed between the 13H and the 13H.
With this configuration, even if the outrigger rotation shaft 15 is tilted, the outrigger rotation shaft is before the shaft member 4 comes into contact with both the inner diameter surface of the mounting hole 13Hm and the inner diameter surface of the fitting hole 15H. 15 comes into contact with the inner diameter surfaces of the shaft holes 11H to 13H. As a result, even when the outrigger rotating shaft 15 is tilted, the shearing force generated in the shaft member 4 can be reduced, and damage to the shaft member 4 can be suppressed.

(Modified example of the first embodiment)
(1) In the first embodiment, the fixing member 2 is composed of a hexagonal holed plug and fixed by screwing into the mounting hole 13 Hm or 31 Hm, but the structure is not limited to this. For example, the columnar fixing member may be fixed by welding or the like, or may be fixed by another fixing method.

(2) In the first embodiment, the elastic member 3 is configured by superimposing a plurality of disc springs, but the configuration is not limited to this, and other types of springs may be used, or other than springs. An elastic member may be used. For example, as in the rotation stop member 1A shown in FIG. 16, instead of the elastic member 3 made of a disc spring, for example, an elastic member 5 made of a rubber cushion may be provided. The elastic member 5 is made of, for example, nitrile rubber (NBR), and as shown in FIG. 17, is formed in a cylindrical shape having a through hole penetrating in the axial direction. As described above, even if the stop member 1A having a rubber cushion is used as the elastic member, it is possible to obtain the same action and effect as in the first embodiment.

(3) In the first embodiment, the structure of the rotation stop device for the rotating shaft has been described with one stop member 1, but the structure is not limited to this configuration, and a plurality of stop members 1 can rotate the rotation shaft. It may be the structure of a stop device.

(4) In the first embodiment, the positions where the mounting holes 13Hm and 13Hm are provided are set to positions facing the base end side arm when the outrigger is rotated by 90 °, but the configuration is not limited to this. That is, if there is another appropriate position, it may be provided at a position opposite to each other when rotated to another angle.

(5) In the first embodiment, an example in which the present invention is applied to the rotary support portion of the crane shown in FIG. 1 has been described, but the present invention is not limited to this, and the present invention is applied to the rotary support portion having another configuration. May be applied. Further, the present invention is not limited to the crane, and the present invention may be applied to other working machines as long as they have a structure that can rotate around the axis of the rotating shaft.

(Second Embodiment)
Next, a second embodiment of the rotation stop device for the rotating shaft according to the present invention will be described. In the following description, the same parts as those in the first embodiment may be designated by the same reference numerals, and the description may be omitted as appropriate.
(composition)
In the second embodiment, the rotation stopper device using the rotation stop member 1 is applied to a crane (working machine) 300 having a rotation support portion 30 having a configuration different from that of the rotation support portion 10 of the first embodiment. The point is different from the first embodiment.
As shown in FIG. 18, the crane 300 according to the second embodiment of the present invention includes a chassis frame (hereinafter, abbreviated as “frame 301”), a crane device 302, a traveling device 303, and four outriggers 304. And each outrigger 304 is provided with a rotation support portion 30. In addition to this, the crane 300 includes a driving unit 305, a control box 306, a crane operating unit (not shown), a traveling operating unit 308, and a lock pin 309. Note that FIG. 18 shows a state in which the outrigger 304 is stored.

(Structure of rotation support portion 30)
Next, a detailed configuration of the rotation support portion 30 will be described with reference to FIGS. 19 and 20.
As shown in FIGS. 19 and 20, each rotation support portion 30 includes an upper frame portion 31, a lower frame portion 32, a lower end frame portion 33, an outrigger rotation shaft 35, and a sensor mounting bracket 36.
The upper frame portion 31 is formed in a relatively thick substantially columnar shape. The lower frame portion 32 is formed in a relatively thin plate shape, and is arranged below the upper frame portion 31 at a predetermined distance. Further, although not shown, the lower frame portion 32 is provided with a plurality of fixing holes used for fixing the overhanging position so as to vertically penetrate the lower frame portion 32. The lower end frame portion 33 is arranged below the lower frame portion 32. Further, the upper frame portion 31, the lower frame portion 32, and the lower end frame portion 33 are formed with shaft holes 31H, 32H, and 33H that communicate with each other in the vertical direction, respectively.

The outrigger rotation shaft 35 is formed in a columnar shape. Further, the outrigger rotation shaft 35 is arranged so as to vertically penetrate the upper frame portion 31, the lower frame portion 32, and the lower end frame portion 33. Further, the outrigger rotation shaft 35 is inserted into the shaft holes 31H to 33H in the state where the outrigger 304 is mounted, and is fixed to the frame 301 via the rotation stop member 1 and the upper frame portion 31. The details of the structure of the rotation shaft detent device for detenting the outrigger rotation shaft 35 will be described later.
The sensor mounting bracket 36 is for mounting the potentiometer 200 coaxially with the outrigger rotation shaft 35, and is screwed to the upper part of the outrigger rotation shaft 35 by a countersunk screw (not shown).

(Structure of base end side bracket 61)
Next, a detailed configuration of the base end side bracket 61 will be described with reference to FIGS. 18 to 20.
As shown in FIGS. 19 and 20, the base end side bracket 61 included in each outrigger 304 includes an upper plate 61T, a lower plate 61B, a support plate 61a, and a boss portion 61b.
The support plate 61a is composed of a pair of opposing plate portions. The upper portion of the support plate 61a is formed in a substantially triangular shape when viewed from the side. Further, a hole is formed between the upper ends of the portions formed in a substantially triangular shape so that the base end portion of the outrigger cylinder 70 can be attached so as to be axially supportable. In addition to this, from the portion formed in a substantially triangular shape to the lower end, the upper plate 61T, the boss portion 61b, and the lower plate 61B are fixed to a series of members.

The upper plate 61T has a shaft hole 61TH. The shaft holes 61TH are provided so as to penetrate each outrigger 304 at a position coaxially communicating with the shaft holes 31H to 33H of the rotation support portion 30 in a state of being mounted on the frame 301 via the rotation support portion 30.
Further, the lower plate 61B has an insertion hole 61BH for inserting the boss portion 61b. In addition to this, the lower plate 61B is provided with a plurality of fixing holes 61BHr used for fixing the overhanging position. Then, one of the plurality of fixing holes 61BHr and any one of the plurality of fixing holes provided in the rotation support portion 30 are coaxially aligned, and the insertable / removable lock pin 309 is inserted into the fixing hole 61BHr. And the fixing hole of the rotation support portion 30. As a result, the overhanging position (rotational position) of the outrigger 304 can be fixed.

On the other hand, the boss portion 61b is formed in a cylindrical shape and is provided below the upper plate 61T. A gap into which the upper frame portion 31 enters is formed between the upper portion of the boss portion 61b and the upper plate 61T. From this, the base end side bracket 61 is attached to the rotation support portion 30 so that the upper frame portion 31 is placed on the lower frame portion 32 while being inserted into the gap between the upper plate 61T and the boss portion 61b. Attach to.
Further, the inner peripheral portion of the boss portion 61b constitutes a shaft hole 61bH through which the outrigger rotation shaft 15 is inserted. Therefore, the boss portion 61b is provided with a shaft hole 61bH at a position coaxially communicating with the shaft hole 61TH and the shaft holes 31H to 33H of the rotation support portion 30.

(Outrigger 304 mounting configuration)
Next, the mounting configuration of each outrigger 304 on the frame 301 will be described with reference to FIGS. 18 to 20.
Each outrigger 304 is mounted on the frame 301 with the boss portion 61b and the lower plate 61B sandwiched between the lower frame portion 32 and the upper frame portion 31. Then, the shaft holes 31H to 33H of the rotation support portion 30 and the shaft holes 61TH and 61bH of the base end side bracket 61 are arranged so as to coaxially overlap with each other with respect to the shaft holes 61TH and 61bH and the shaft holes 31H to 33H. The outrigger rotation shaft 35 is mounted in a inserted state.
The outrigger rotation shaft 35 has a structure of being fixed to the frame 301 via the upper frame portion 31 and the rotation stop member 1. In this way, each outrigger 304 is mounted on the frame 301 so as to be rotatable around the outrigger rotation shaft 35.

(Structure of rotation stop device for rotating shaft)
Next, the structure of the rotation stop device for the rotating shaft will be described with reference to FIGS. 21 and 22.
As shown in FIG. 21, a mounting hole 31Hm for mounting the turning member 1 is provided on the side surface of the upper frame portion 31 so as to penetrate from the outer surface to the inner shaft hole 31H. Further, a female screw (not shown) for screwing the fixing member 2 is formed on the inner peripheral portion of the outer end portion of the mounting hole 31 Hm.

Further, on the outer peripheral surface of the outrigger rotation shaft 35, a fitting hole 35H communicating with the mounting hole 31Hm is formed at a position facing the mounting hole 31Hm. The fitting hole 35H is a hole having a bottom surface. Further, the end portion on the back side (bottom side) of the fitting hole 35H is formed in a conical shape, and a taper 35T is formed on the back side end portion over the entire circumference. Here, the taper 4T of the shaft member 4 is configured to have an inclined shape along the taper 35T. Note that FIG. 21 shows a state before the turning member 1 is inserted into the mounting hole 31Hm and the fitting hole 35H. Further, FIG. 22 shows a state after the turning member 1 is inserted into the mounting hole 31Hm and the fitting hole 35H.

Then, as shown in FIGS. 21 and 22, first, the shaft member 4 constituting the rotation stop member 1 is inserted into the mounting hole 31Hm using a jig, for example, and the tip end side of the shaft member 4 is fitted. It fits into the hole 35H. Next, the elastic member 3 is inserted into the mounting hole 31 Hm. Then, the fixing member 2 is screwed into the mounting hole 31 Hm using a tool such as a hexagon wrench. As a result, the shaft member 4 is pushed toward the tip end via the elastic member 3, and the taper 4T comes into contact with the taper 35T. As a result, the upper frame portion 31 and the outrigger rotation shaft 35 are connected to each other via the rotation stop member 1.
In this state, as in the first embodiment, the slidable shaft member 4 is pressed toward the tip end side, and the outrigger rotating shaft 35 is pressed from the side surface through the fitting hole 35H. As a result, the outer peripheral surface of the outrigger rotating shaft 35 opposite to the fitting hole 35H is pressed against the inner diameter surface forming the shaft hole 31H of the upper frame portion 31.

As described above, in the second embodiment, the outrigger rotation shaft 35 rotation stop device is configured by the rotation stop member 1, the upper frame portion 31, the mounting hole 31Hm, the outrigger rotation shaft 35, and the fitting hole 35H.
Further, in the second embodiment, as shown in FIG. 20, the potentiometer 200 is installed coaxially with the outrigger rotation shaft 35 at the upper end of the outrigger rotation shaft 35 via the sensor mounting bracket 36. The rotor of the potentiometer 200 is fixed to the outrigger 304, and the rotor of the potentiometer 200 rotates with the rotation of the outrigger 304. This makes it possible to detect the rotation angle of the outrigger 304.

(Action and effect of the second embodiment)
As described above, according to the rotation shaft detent device according to the second embodiment, the same operation and effect as the rotation shaft detent device according to the first embodiment can be obtained.
(Modified example of the second embodiment)
(1) In the second embodiment, an example in which the present invention is applied to the rotary support portion of the crane shown in FIG. 18 has been described, but the present invention is not limited to this, and the present invention is applied to the rotary support portion having another configuration. May be applied. Further, the present invention is not limited to the crane, and the present invention may be applied to other working machines as long as they have a structure that can rotate around the axis of the rotating shaft.

1 Stopping member 2 Fixing member 3, 5 Elastic member 4 Shaft member 4T Tapered 4H Punching tap hole 10,30 Rotating support part 11,31 Upper frame part 11H to 13H, 31H to 33H, 41H1, 41H2, 61TH, 61bH Shaft hole 12 Intermediate frame part 13, 32 Lower frame part 13Hm, 31Hm Mounting hole 15,35 Outrigger rotation shaft 15H, 35H Fitting hole 15T, 35T Tapered 33 Lower end frame part 36 Sensor mounting bracket 41,61 Base end side bracket 41a, 61T Upper plate 41b, 61B Lower plate 41c Connection part 41d, 61a Support plate 41Hr, 61BHr Fixing hole 43 Base end side arm 44 Tip side bracket 44a Lock pin 45 Tip side arm 46 Outer box 46a Lock pin 47 Inner box 48 Float 50, 70 Out Trigger Cylinder 61b Boss 61BH Insertion Hole 100, 300 Crane 101, 301 Frame 102, 302 Crane Device 103, 303 Travel Device 104, 304 Out Trigger 105, 305 Motor Drive 106, 306 Control Box 107 Crane Operation Unit 108, 308 Travel Operation Part 109,309 Lock pin 120 Column 121 Boom 122 Wire rope 123 Hook 200 Potential meter

Claims (7)

A work machine provided with a rotating shaft, a base member having a shaft hole through which the rotating shaft is inserted, and a bracket rotatably attached by inserting the rotating shaft into the shaft hole, and has a central axis. A mounting hole formed from the outer surface of the foundation member to the shaft hole so as to be orthogonal to the central axis of the shaft hole, and a side surface of the rotating shaft so that the central axis is orthogonal to the central axis of the rotating shaft. By inserting the stop member into the mounting hole and the fitting hole in a state where the formed fitting hole is communicated with the formed fitting hole, the rotation shaft is prevented from rotating so that the foundation member and the rotation shaft are locked to each other. It ’s a device,
The turning member is an intermediate portion sandwiched between a fixing member forming the base end side of the turning member, a shaft member forming the tip end side of the turning member, and the fixing member and the shaft member. Each of the elastic members constituting the portion is provided, and the shaft member is configured to be movable by elastic deformation of the elastic member, and the shaft member is said to be in a compressed state even when the elastic member is in a compressed state. Always engaged with the mating hole
The fitting hole has a conical bottom surface and has a conical bottom surface.
The tip of the shaft member is a detent device for a rotating shaft that is tapered along the conical shape. The detent device for a rotating shaft according to claim 1, wherein the shaft member is formed with a punched tap hole opened on a surface of the shaft member facing the fixing member. The detent device for a rotating shaft according to claim 1 or 2, wherein the fixing member is fixed to the foundation member in a state where the elastic member is pressed against the shaft member. The detent device for a rotating shaft according to any one of claims 1 to 3, wherein the elastic member is composed of a spring other than a disc spring or a rubber cushion. The detent device for a rotating shaft according to any one of claims 1 to 3, wherein the elastic member is a disc spring. The foundation member is a frame of the working machine.
The rotation shaft detent device according to any one of claims 1 to 5, wherein the bracket is an outrigger base end side bracket of the work machine. The total of the gap formed between the shaft member and the mounting hole and the gap formed between the shaft member and the fitting hole is formed between the rotating shaft and the shaft hole. The detent device for a rotating shaft according to any one of claims 1 to 6, which exceeds the gap.

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