JP3497635B2 - Revolving body mounting device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction work machine, such as a self-propelled crane such as a truck crane, in which a work machine revolving structure is rotatably attached to a vehicle body.
In particular, the present invention relates to a revolving structure attachment device for detachably mounting the revolving structure and the vehicle body.

[0002]

2. Description of the Related Art In recent years, construction work machines have been inevitably increased in size as construction work has been increased in size. Above all,
As for self-propelled cranes, 500t class truck cranes have been introduced.

FIG. 8 shows a truck crane which is an example of a construction work machine. This truck crane 100
It comprises a traveling vehicle body (hereinafter referred to as a carrier) 101 and a revolving structure 102. The revolving structure 102 is rotatably mounted on the carrier 101 via a turntable 103. The carrier 101 is provided with a driver's cab 105 for performing a normal traveling operation, and the revolving structure 102 is provided with a driver's cab 106 for performing a crane work operation and a telescopic boom 109 capable of hoisting by a hoisting cylinder 110. Has been.

By the way, in general, a large truck crane cannot run on a general road with the revolving structure 102 mounted on the carrier 101 due to the regulations of the Road Traffic Law. Therefore, in the case of a large truck crane, the revolving structure 102 is removed from the carrier 101, the revolving structure 102 is further separated if necessary, and the part on the revolving structure 102 side is transported on a general road by a separately prepared trailer. The carrier 101 is designed to run on a general road by itself.

However, in a large truck crane, due to its large weight, it is not easy to separate the revolving structure 102 and the carrier 101. Therefore, the revolving structure 102 and the carrier 101 can be reliably and easily detached from the related art. Various detachable structures have been developed.

9 and 10 show an example of a structure for attaching and detaching the revolving structure 102 and the carrier 101 (Japanese Patent Laid-Open No. 64-17798). FIG. 10 shows a connecting portion between the revolving structure 102 and the carrier 101.
The annular connecting portion 111 of the turntable 103 on the second side is fitted with the annular fixing portion 121 fixed to the vehicle body frame 113 of the carrier 101, and the lower flange portion 111a and the lower flange portion 111a of the annular connecting portion 111 that abut each other by this fitting. The upper flange portion 121a of the fixed portion 121 is sandwiched by the C-shaped lock ring 120, so that the revolving structure 102
Are attached to the carrier 101.

The lock ring 120 receives both flange portions 111a and 121a in the fitting groove 120a and clamps both flange portions 111a and 121a. As shown in FIG. 9, the lock ring 120 is connected to the hydraulic cylinder 160a. The notch S is opened and closed by the opening / closing device 160 to expand / contract the outer diameter. The lock ring 12
0 is slidably supported in the horizontal direction on a plurality of plate-shaped abutments 125, 126, 127 fixed to the vehicle body frame 131.

In this structure, when the lock ring 120 is reduced in diameter by the opening / closing device 160 and the connecting portion 111 of the turntable 103 and the fixing portion 121 of the vehicle body frame 113 are tightened from the outside by the lock ring 120, the fixing portion 12 is fixed.
1, the connection portion 111 is fixed, and the revolving structure 102 is attached to the carrier 101. In addition, the lock ring 120 is expanded by the opening / closing device 160 to expand the lock ring 120.
When the tightened state of the
The fixed state of 11 is released, and the revolving structure 102 can be removed from the carrier 101.

[0009]

By the way, as described above, in the structure in which the revolving structure 102 is attached to and detached from the carrier 101 by the lock ring 120, the lock ring 120 is expanded and opened by the opening / closing device 160. When loosening the tightened state, it is ideal that the lock ring 120 opens concentrically while the center of the lock ring 120 is always fixed to the swing center of the swing body 102.

However, in reality, the center position of the lock ring 120 changes with the expansion thereof. Further, the load may be biased in one direction depending on the direction of the boom 109 of the crane, and the bias of the load may cause the lock ring 120 to open one side to the left or right.

Therefore, in particular, when the lock ring 120 is in a floating state in which it is simply placed on the plate-like abutments 125, 126, 127, the lock ring 120 is opened by the opening / closing device 160.
When the lock ring 120 is expanded, the lock ring 120 hangs in the circumferential direction, and the center of the lock ring 120 is largely deviated from the rotation center of the revolving structure 102, so that a part of the lock ring 120 expanded unevenly is a flange. There is a possibility that the revolving structure 102 cannot be removed from the carrier 101 side by remaining in the state of being fitted with the portions 111a and 121a. That is, when the floating lock ring 120 is opened only by the opening / closing device 160, the lock ring 120 moves in various directions or partially opens, and even when the lock ring 120 is fully opened, the lock ring 120 and the flange portion 111a. , 121a cannot be disengaged.

Therefore, conventionally, as shown in FIGS. 9 and 10, the lock ring 1 is provided by a separate hydraulic cylinder 115.
By aligning the positions of 20, the center of the lock ring 120 is made to coincide with the swing center of the swing body 102 at least when the lock ring 120 is fully opened.

That is, the hydraulic cylinder 11 for moving the central portion of the lock ring 120 back and forth along the diameter line D (see FIG. 9).
5 is fixedly provided to the body frame 113, and the opening / closing device 16
When the lock ring 120 is expanded by 0, the central portion of the lock ring 120 is retracted along the diameter line D by the hydraulic cylinder 115, so that the lock ring 120 is moved to the flange portion 1.
The revolving structure 102 can be detached from the carrier 101 side by separating the revolving body 102 from the outer side in the radial direction of the 11a and 121a. That is, the center position of the lock ring 120, which changes depending on the diameter of the lock ring 120, is set to the hydraulic cylinder 1.
The center of the lock ring 120 is made to coincide with the swing center of the swing structure 102 when the lock ring 120 is fully opened by moving the lock ring 120.

However, in the method of restricting the center position of the lock ring 120 by the hydraulic cylinder 115 as described above,
Since a hydraulic circuit or the like needs to be newly provided, the attachment / detachment structure becomes complicated, and the hydraulic control becomes complicated, which causes various problems.

Further, it is difficult to completely prevent the lock ring 120 from being opened only by the hydraulic cylinder 115. The present invention has been made in view of the above circumstances,
The purpose is to realize the attachment and detachment of the revolving structure and the carrier by the lock ring with a simple structure,
In particular, it is intended to prevent the lock ring from being opened one-sided and to expand the lock ring concentrically as much as possible.

[0016]

In order to solve the above-mentioned problems, a turning body mounting apparatus of the present invention comprises a C-shaped ring body having a notch and is fixed to a body frame on a turning body mounting portion. To the vehicle body frame, a lock ring for fastening the revolving structure, a ring expansion / contraction means for expanding / contracting the outer diameter of the lock ring, and a lock ring expanded / reduced by the ring expansion / contraction means are slidably supported on the vehicle body frame. Ring support means for guiding the lock ring to the fastening portion between the body mounting portion and the revolving structure, engagement means projecting from the lock ring, and engagement means provided on the vehicle body frame and engaged with the engagement means. Then, there is provided an expansion restricting means for restricting the expansion direction of the lock ring by means of a guide groove for guiding this in a predetermined direction.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a connecting portion between a revolving structure 10 and a carrier 12 of, for example, a truck crane. The turntable 3 of the swing body 10 is the swing body 1
It is composed of an outer ring 19 fixed to the bottom of 0 with a large number of bolts 18, and an inner ring 23 rotatably attached to the outer ring 19 via rollers 20, 21, 22. A gear 24 is formed on the outer side of the inner ring 23, and a plurality of hydraulic motors (not shown) mounted on the revolving structure 10 are formed on the gear 24.
Pinions (not shown) each driven by
Are engaged with each other.

An upper seat ring 15 is provided below the inner ring 23 so as to project therefrom.
The lower seat ring 16 is welded and fixed on the vehicle body frame 13 of FIG. That is, an annular protrusion 17 is provided on the inner side of the upper end of the lower seat ring 16 so as to project upward, and the tapered taper surface 2 having an upper taper is provided on the outer periphery of the annular protrusion 17.
7 are formed. Then, the tapered taper surface 28 formed on the lower inner peripheral surface of the upper seat ring 15 is pushed along the tapered surface 27 of the annular projection 17 to fit the upper seat ring 15 onto the lower seat ring 16. The flange portion 15a formed at the lower end of the upper seat ring 15 and the flange portion 16a formed at the upper end of the lower seat ring 16 come into contact with each other.

The fitting between the seat rings 15 and 16 is as follows.
It is held by a lock device 30 described later. The lock device 30 has a C-shaped lock ring 31. The lock ring 31 is adapted to receive both flange portions 15a and 16a in a fitting groove 69 formed inside thereof and clamp and fix both flange portions 15a and 16a.

The locking device 30 is shown in FIG. As described above, the lock device 30 includes the C-shaped lock ring 31 having the notch S, and the notch S of the lock ring 31.
A lock mechanism 80 for opening / closing the notch S and expanding / contracting the outer diameter of the lock ring 31 is provided in the area.

The details of the locking mechanism 80 are shown in FIG. As shown in the figure, the lock mechanism 80 includes a turnbuckle 4 installed between both ends 31 a and 31 b of the lock ring 31.
Equipped with 2. The turnbuckle 42 is composed of a long shaft, and has a first screw part 42a formed by cutting a right-hand screw (left-hand screw) and a second screw part formed by cutting a left-hand screw (right-hand screw) on the outer peripheral surface of the shaft. And 42b on both sides thereof.

Nuts 43 and 43 are screwed into the screw portions 42a and 42b, respectively. Each nut 43, 43
Is fixed to an upper flange portion 40 and a lower flange portion 41 that are provided so as to project outside the respective end portions 31 a and 31 b of the lock ring 31.

Therefore, when the turnbuckle 42 is rotated in one direction by, for example, an air runner, the two opposing nuts 43, 43 slide away from each other along the axial direction of the turnbuckle 42, and the lock ring 31.
The notch S opens and the lock ring 31 expands in diameter. If the turnbuckle 42 is rotated in the opposite direction, the nut 4
3, 43 slide so as to approach each other along the axial direction of the turnbuckle 42, the notch S of the lock ring 31 is closed, and the lock ring 31 is reduced in diameter.

A holding member 50 for holding the central portion of the turnbuckle 42 is fixed to the vehicle body frame 13. The holding member 50 has an elongated hole 51 extending along the expansion / contraction direction (radial direction) of the lock ring 31.
The turnbuckle 42 is pierced by 1 and is held.
The elongated hole 51 is provided to allow the turnbuckle 42 to move radially outward along with the expansion and contraction of the diameter of the lock ring 31, and the length thereof is the revolving structure 10 and the carrier 12.
It is set to be sufficiently longer than the movement amount of the turnbuckle 42 corresponding to the widening width of the lock ring 31 that enables attachment and detachment of the lock ring 31.

A pair of stoppers 4 for restricting the axial movement of the turnbuckle 42 is provided at the central portion of the shaft of the turnbuckle 42 which penetrates the elongated hole 51 of the holding member 50.
6, 46 are provided. These stoppers 46, 4
6 is a holding member 50 so as to sandwich the holding member 50 from both sides.
A guide member that faces each side surface of the lock ring 31 and moves the turnbuckle 42 that moves in accordance with the expansion and contraction of the diameter of the lock ring 31 to the outside in the radial direction along the elongated hole 51 without hanging left and right. Also works as.

It should be noted that instead of forming the long hole 51 in the holding member 50, the holding member 50 is composed of two plate members, and the turnbuckle 42 is sandwiched by the plate members from above and below. Alternatively, these plate members may be connected by bolts in consideration of the amount of movement of the turnbuckle 42 (a configuration similar to FIGS. 1, 4, 5 and 6 is drawn). In this case, the locking device 30 can be attached to and detached from the holding member 50 only with the bolts, which is very useful.

Further, the holding member 50 includes stoppers 46, 4
6 functions as a restricting member that restricts the movement of the turnbuckle 42 in the axial direction, but the elongated hole 51 may not be provided as long as it is arranged as a member having only this function. For example, a cantilever-shaped holding member 50 is detachably supported by a pillar extending upward from the vehicle body frame 13, and the holding member 50 is positioned between the stoppers 46, 46 of the turnbuckle 42 to engage with the stoppers 46, 46. You may make it match.

Further, on the lower surface of each of the two lower flange portions 41, 41 of the lock ring 31, a pin 4 which engages with a guide groove 71 (see FIG. 4) of the expansion restricting member 45 described later.
4,44 are projected.

FIG. 4 is a plan view of the mounting portion of the vehicle body frame 13 on which the swing structure 10 is mounted. As described above, the lower seat ring 16 forming the mounting portion of the revolving structure 10 is fixed to the vehicle body frame 13. Further, a plurality of plate-shaped abutments 61 to 68 that support the lock ring 31 slidably in the horizontal direction are provided on the upper surface of the vehicle body frame 13.

Further, the expansion restricting member 45 is used as the vehicle body frame 1.
It is provided on the 3. The expansion restricting member 45 is formed with guide grooves 71 on both sides thereof, which engage with the pins 44, 44 projecting from the lower flange portions 41, 41 of the lock ring 31 and guide them in a predetermined direction. ing. The expansion restricting member 45 restricts the movement of the pins 44, 44 accompanying the expansion of the lock ring 31 by the guide groove 71, restricts the expansion direction of the lock ring 31, and expands the lock. The center O ′ of the ring 31 is moved so as to coincide with the swing center O of the swing body 10. Therefore, the guide groove 71 is, for example,
At the stage where the lock ring 31 is fully opened to a predetermined opening degree at which the revolving structure 10 can be removed from the carrier 12, the lock ring 31
Is formed so that its center O ′ coincides with the swing center O of the swing body 10.

Specifically, the guide groove 71 includes the pins 44,
An inclined groove portion 71a that guides 44 diagonally away from the turning center O to move the turnbuckle 42 in the radial direction of the lock ring 31, and a pin 44, from the end of the inclined groove portion 71a.
The locking groove 71 b is configured to move 44 in a direction perpendicular to the radial direction of the lock ring 31 to restrict the radial movement of the turnbuckle 42. A stopper 45a is provided at the end of the restriction groove portion 71b to prevent the pin 44 from falling off the restriction groove portion 71b.

The guide groove 71 as described above first facilitates the expansion of the diameter of the lock ring 31 by the inclined groove portion 71a, and then restricts the expanding direction of the lock ring 31 by the restriction groove portion 71b to extend the entire circumference of the lock ring 31. Contributes to uniform diameter expansion.

The positions of the inclined groove portion 71a and the regulating groove portion 71b are reversed, the first half of the expansion of the lock ring 31 is first regulated by the regulating groove portion 71b, and the subsequent expansion is inclined groove portion 7.
It may be performed by the guidance of 1a.

Further, as shown in FIG. 2, the lock ring 31 is provided with a pair of guide portions 60, 60 on the outer side of the central portion thereof which faces the notch S and the ring center O '. . On the other hand, on the vehicle body frame 13 side, as shown in FIG. 4, upward protrusions in which the guide portions 60, 60 engage with the portion of the plate-shaped support 68 that faces the expansion restricting member 45 with the turning center O interposed therebetween. The portion 68a is provided.

As shown in FIG. 7, the guide portions 60, 60 of the lock ring 31 are always engaged with the upward projecting portion 68a in a state where the lock ring 31 is placed on the plate-like support 68, Variation of the center position due to the diameter expansion of the lock ring 31 is suppressed as much as possible on the side opposite to the expansion restricting member 45, and the rotational movement of the lock ring 31 is restricted. In addition, the upper protruding portion 6 of the plate-shaped abutment 68
8a is configured to contact the lock ring 31 when the expanding diameter of the lock ring 31 reaches a predetermined opening degree, and serves as a restricting member that restricts the expanding direction of the lock ring 31 together with the expanding restricting member 45. Function.

Next, the operation of the lock device 30 having the above structure will be described. FIG. 5 shows a state in which the flange portion 16a of the lower seat ring 16 of the turntable 3 on the revolving structure 10 side and the flange portion 15a of the upper seat ring 15 on the vehicle body frame 13 side are tightened and fixed by the lock ring 31 from the outside. There is.

In this tightened state, the flange portions 15a and 16a are fitted in the fitting groove 69 of the lock ring 31,
The upper seat ring 15 is non-rotatably fixed to the lower seat ring 16. Therefore, the revolving structure 10 with respect to the carrier 12
Is attached and fixed. As a result, the inner ring 23 becomes the carrier 1
Although it is non-rotatably fixed to the second body frame 13, since the outer ring 19 is rotatable with respect to the inner ring 23,
The part of the revolving superstructure 10 above the outer ring 19 can swivel with respect to the carrier 10 by driving a pinion that meshes with the gear 24 of the inner ring 23.

Further, in this tightened state, the pin 44 protruding from the flange portion 41 of the lock ring 31 has the expansion limiting member 4
5 is engaged with the rear end portion of the inclined groove portion 71a of 5,
The guide portions 60, 60 at the central portion of the lock ring 31 are engaged with the upper protruding portion 68a of the plate-like support 68 as shown by the solid line in FIG.

When the turnbuckle 42 is rotated in a predetermined direction by, for example, an air runner from this tightened state,
Two nuts 43, 43 facing each other are turnbuckle 42.
The lock ring 31 slides away from each other along the axial direction, and the notch S of the lock ring 31 opens to expand the diameter of the lock ring 31. Due to the diameter expansion of the lock ring 31, the turnbuckle 4
2 also moves to the outside in the radial direction of the lock ring 31, but this movement is performed substantially parallel to the pin 51 while the stoppers 46, 46 and the holding member 50 engage with each other without hanging left and right. The amount of movement is restricted by the guide of the inclined groove portion 71a with which the lock ring 44 engages, and thus the lock ring 31 is prevented from opening one side.

When the diameter of the lock ring 31 is further expanded from this state and the pin 44 engages with the restriction groove portion 71b, the radial movement of the turnbuckle 42 thereafter is restricted, and the expansion direction of the lock ring 31 is changed. Further regulated. That is, when the pin 44 engages with the restriction groove 71b, the lock ring 31 is pressed against the restriction groove 71b via the pin 44, and the lock ring 3 is pressed by the resultant force of the pressing reaction force.
1 has the expanding direction changed and the upper protruding portion 6 of the plate-like support 68 is
Further, it slides on the plate-shaped abutments 61 to 68 until it is pressed against 8a.

The lock ring 31 moves from the solid line state to the broken line state shown in FIG.
When the lock ring 31 is pressed against a, the expansion direction of the lock ring 31 is further changed by the resultant force of the reaction forces, and the lock ring 31 slides on the plate-shaped abutments 61 to 68 to reach a predetermined expansion position (specifically, , For example, at the position where the pin 44 abuts on the stopper 45a at the terminal end of the restriction groove portion 71b), the center O'is the turning center O.
Is matched with. This state is shown in FIG.

As described above, the expansion direction of the lock ring 31 is restricted by the expansion restricting member 45 and the upper projecting portion 68a of the plate-like support 68 so that the lock ring 31 is positioned, and the entire circumference of the lock ring 31 is extended from the flanges 15a and 16a. It is separated to the outside in the radial direction. Therefore, the upper seat ring 15 with respect to the lower seat ring 16
The fixed state of the carrier is released, and the revolving structure 1 for the carrier 12 is released.
0 can be removed.

Further, when the diameter of the lock ring 31 is reduced from this state and the flange portions 15a and 16a are tightened by the lock ring 31, the turnbuckle 42 may be rotated in the opposite direction.

As described above, the locking device 30 of the present embodiment is positioned with the expansion direction of the lock ring 31 being restricted by the expansion restricting member 45 and the upper protruding portion 68a of the plate-like support 68. Therefore, the lock ring 31 is prevented from being opened one-sided, and the lock ring 31 can be expanded concentrically as much as possible and can be reliably separated from the flange portions 15a and 16a to the outer side in the radial direction. In particular, the feature of the present embodiment is realized by the restriction by the expansion restricting member 45 by simply guiding the pin 44 protruding from the lock ring 31 along the guide groove 71 formed in the expansion restricting member 45. The structure is simple as compared with the conventional case where the hydraulic cylinder 115 restricts the expansion of the lock ring 31 as shown in FIG. 9 and FIG. It is possible to perform precise positioning.

Further, in the lock device 30 of this embodiment, the movement of the turnbuckle 42 due to the diameter expansion of the lock ring 31 is
Since the stoppers 46, 46 and the holding member 50 are engaged with each other and are guided substantially parallel to each other along the elongated hole 51 without being swayed to the left and right, the lock ring 31 is prevented from opening one side. Is further promoted. Also, due to such movement restriction of the turnbuckle 42,
The safety of the operator who operates the turnbuckle 42 is also ensured.

The turnbuckle 42 is used in this embodiment.
Although the diameter of the lock ring 31 is expanded by the above, it is needless to say that the same effect as that of the present embodiment can be obtained even if this is performed by another driving means such as a hydraulic cylinder.

[0047]

As described above, according to the revolving structure mounting apparatus of the present invention, the lock ring can be prevented from being opened one side and the lock ring can be expanded concentrically as much as possible. It is possible to securely attach and detach the body and the carrier with a simple structure.

[Brief description of drawings]

FIG. 1 is a side cross-sectional view showing a state in which an upper seat ring on the revolving structure side and a lower seat ring on the vehicle body frame side are fastened together using a revolving structure mounting apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view of a lock ring of the swing body attaching device.

3 (a) is a plan view of a mechanism for expanding / contracting the outer diameter of the lock ring of FIG. 2, (b) is a front view of (a), and (c) is a side view including a partial cross section of (a). Is.

FIG. 4 is a plan view of a swing body mounting portion of a vehicle body frame including a swing restriction member.

FIG. 5A is a plan view showing a state in which an upper seat ring on the revolving structure side and a lower seat ring on the vehicle body frame side are fastened by a lock ring, and FIG. 5B is an enlarged view of a part of the turning restriction member in FIG. It is the enlarged view shown.

6 (a) is a plan view showing a state in which the lock ring is loosened from the tightened state of FIG. 5 and the lock ring is separated from the seat ring radially outward over the entire circumference, and FIG. 6 (b) is the turning of FIG. It is the enlarged view which expanded and showed the site | part of a regulation member.

FIG. 7 is a cross-sectional view showing a movement restricting mechanism at a central portion of a lock ring.

FIG. 8 is a schematic view of a truck crane.

FIG. 9 is a plan view of a conventional lock ring.

10 is a side cross-sectional view showing a state in which an upper seat ring on the revolving structure side and a lower seat ring on the vehicle body frame side are fastened together using the lock ring of FIG. 9.

[Explanation of symbols]

10 ... Revolving structure, 12 ... Carrier, 13 ... Body frame,
15 ... Upper seat ring, 15a, 16a ... Flange part (fastening part), 16 ... Lower seat ring (swing body mounting part), 31 ... Lock ring, 42 ... Turn buckle (ring expansion / contraction means), 44 ... Pin (engagement) Means), 45 ... expansion regulation member, 61-68 ... plate-shaped abutment, 71 ... guide groove.

Claims (3)

(57) [Claims] 1. A lock ring for fastening a revolving structure to a revolving structure mounting portion fixed to a vehicle body frame, the lock ring comprising a C-shaped ring body having a notch, and an outer diameter of the lock ring. Ring expanding and contracting means for expanding and contracting, and ring supporting means for slidably supporting the lock ring expanded and contracted by the ring expanding and contracting means on the vehicle body frame and guiding the lock ring with respect to the fastening portion between the revolving structure mounting portion and the revolving structure. And an engaging means projecting from the lock ring, and a guide groove provided on the vehicle body frame for engaging the engaging means and guiding the engaging means in a predetermined direction regulates the expanding direction of the lock ring. A revolving structure attachment device, comprising: 2. The swivel according to claim 1, wherein the guide groove of the expansion restricting means has a restricting groove for restricting the movement of the engaging means in the radial direction of the lock ring. Body attachment device. 3. The lock ring has a guide portion at a central portion thereof opposed to the notch with the center of the ring interposed therebetween, the ring support means is always engaged with the guide portion, and the lock ring is provided. The revolving structure attachment device according to claim 1, wherein the revolving structure attachment device has an abutting portion that abuts on the lock ring in a state of being expanded to a predetermined opening degree.