JP3389184B2 - Excavator drive for ground excavator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an excavator driving device for a ground excavator, and more particularly, to an earth auger and a shaft excavator mounted on a lower end of a keriba. In a ground excavator that performs an underground excavation work of the ground using an excavator such as a bucket, after excavating soil excavated in a state where the excavator is pulled up to the ground, the excavator adheres to the excavator. TECHNICAL FIELD The present invention relates to an excavator driving device for a ground excavator capable of efficiently removing and removing remaining soil. 2. Description of the Related Art Generally, as a civil engineering / construction machine for digging and excavating the ground, a leader suspension type or a boom suspension type using an excavator such as an earth auger or a shaft excavation bucket. Excavators are known. A conventional ground excavator of this type will be described with reference to FIG. In FIG. 4, reference numeral 1 denotes a boom-suspended ground excavator using a shaft digging bucket, and the ground excavator 1 is provided at a front portion of an upper revolving unit 3 which is rotatably mounted on a lower traveling unit 2. A boom 4 pivotally supported in a vertically movable manner;
And a front frame 5 operatively connected to the upper part of the boom 4, and a kelly bar from the top of the boom 4 via a rope 7 that is operated by a winch 6 provided on the upper swing body 3 side. 8 is suspended, and a shaft digging bucket 9 is attached to the lower end of the kerry bar 8. [0004] A rotary table 12 which is pivotally held at the tip of the front frame 5 is provided with a rotary table 12 which is moved up and down by a thruster cylinder 11, and the kelly bar 8 is moved up and down on the rotary table 12. The kelly bar 8 is slidably supported, and the drive unit 1 includes a hydraulic motor as a driving source for excavation provided on the rotary table 12 and a transmission.
3 is configured to be driven to rotate. Accordingly, in the ground excavator 1, the winch 6 provided on the upper swing body 3 is operated to pull out the rope 7 and lower the kerry bar 8 by its own weight, as is well known. Underground drilling work is performed by the rotation drive of the kelly bar 8 and the shaft digging bucket 9 by the unit 13. The ground excavator 1 is provided with the shaft digging bucket 9 for processing excavated soil and the like accompanying the excavation work.
Is excavated to the outside in a state where the excavated soil is once pulled up to the ground. Clots, mud, and the like may be left as attached, and thereafter, there is a possibility that the accumulation of the attached remaining soil and the like may make it impossible to continue the excavation work efficiently. Therefore, in order to effectively remove residual soil and the like on the inner surface of the shaft digging bucket 9, the ground digging and the like are discharged from the shaft digging bucket 9 pulled up to the ground as usual, and then the shaft digging bucket 9 is continuously lifted. Means for rotating the shaft digging bucket 9 at a high speed in a state of being cut off, thereby cutting off the adhesive force of the adhered residual soil and the like to the inner surface of the bucket by centrifugal force generated in the shaft digging bucket 9 and separating the adhered residual soil and the like. Is considered. That is, a transmission (not shown) using a wet multi-plate clutch or the like, which can be switched between two stages, for example, high speed rotation and low speed rotation, for the driving portion 13 of the shaft digging bucket 9
And a speed change hydraulic circuit (not shown) connected to the hydraulic circuit on the upper revolving unit 3 side for switching the transmission, so that a low speed and a high speed High-speed, low-torque rotary drive is performed on the high-speed side to remove residual soil and the like. In this case, the hydraulic oil used in the hydraulic circuit on the upper swing body 3 side is commonly used for lubrication of the transmission. In this type of conventional ground excavator, hydraulic oil used for a hydraulic circuit on the upper revolving unit is commonly used for lubrication of a transmission, but a wet type is used for the transmission. When using a multi-plate clutch, lubricating the wet-type multi-plate clutch with the hydraulic oil is not preferable in terms of viscosity, extreme pressure, and the like. Therefore, lubricating oil suitable for the transmission, for example,
ATF (Automatic Transmission Fluid)
As means for lubricating the transmission by using, a means for filling the casing of the transmission with a large amount of lubricating oil suitable for the transmission and immersing the casing in the lubricating oil to lubricate the transmission can be considered. In order to prevent thermal expansion of the lubricating oil, in addition to the large amount of lubricating oil space, it is necessary to increase the air chamber space. Or it is difficult to arrange on a rotary table. On the other hand, a means for supplying lubricating oil suitable for the transmission from the upper revolving unit side is also conceivable, but in the case of this means, a lubricating oil supply unit is mounted separately from a hydraulic oil supply mechanism provided on the upper revolving unit. Must. In order to separately mount the lubricating oil supply unit as described above, a predetermined mounting space is required on the upper revolving unit side, and there is a defect that piping and the like are complicated. In view of the above, there is a technical problem to be solved in order to make a compact lubrication mechanism for lubricating a transmission provided in an excavator driving device of a ground excavator by using an appropriate lubricating oil and to improve space efficiency. A problem arises, and the present invention aims to solve this problem. SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above object. An upper revolving unit is mounted on a lower traveling unit, and a top of the upper revolving unit is displaceable. A rotary table driven by a hydraulic motor via a speed change device by suspending a rope drawn out from a winch from the top of the support structure, suspending a kelly bar on the rope. In a ground excavator, which is rotatably supported and vertically movable, and has a shaft excavation bucket or an earth auger connected to a lower end of the kelly bar, the transmission is mounted on an upper portion of a casing of the transmission. The clutch mechanism is provided, and a transmission mechanism connected to the clutch mechanism and provided at a lower portion of the casing. A hydraulic circuit that is separate from the main hydraulic circuit on the upper revolving body side, uses lubricating oil in the transmission as hydraulic oil, and is regulated in pressure by a regulator interposed in the hydraulic circuit for transmission. Is applied to the clutch mechanism to switch the clutch mechanism, and the drain of the operating oil applied to the clutch mechanism is dripped into the clutch mechanism and the transmission mechanism to cause the clutch mechanism to operate. And lubrication of the transmission mechanism portion; and
It is an object of the present invention to provide an excavator driving device for a ground excavator in which the transmission and the transmission hydraulic circuit are arranged on the rotary table or a rotary frame supporting the rotary table. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. In FIG. 1, reference numeral 21 denotes a leader suspension type ground excavator using an earth auger according to an embodiment of the present invention. The ground excavator 21 has a lower traveling body 22 and an upper revolving body 23 that is rotatably installed on the lower traveling body 22.
A reader 24 as a support structure that is maintained in the up-down direction is mounted on the front part of the reader so that the top of the leader 24 is displaceable. The reader 24 is provided with a rotary frame 25 held up and down along the front surface, and the rotary frame 25 has a main hydraulic pump (not shown) provided on the upper revolving unit 23 side. ), A hydraulic motor 26 that is rotationally driven by the hydraulic pressure supplied from the hydraulic motor 26, a transmission 27 that switches the rotational output of the hydraulic motor 26 to obtain two-stage rotational output of high-speed rotation and low-speed rotation, A rotation drive output unit 29 for transmitting the rotation output to the
And a rotary table 30 is provided. On the other hand, from the top of the reader 24, a winch 31 provided on the upper revolving unit 23 is used to lift up the leader 24.
The kelly bar 28, which is driven to rotate by the rotary table 30, is suspended via a rope 32 that is operated to be lowered.
3 is attached. It is also possible to use a shaft digging bucket (not shown) instead of the earth auger 33. Next, FIG. 2 shows the rotary table 3.
FIG. 2 is a schematic cross-sectional view showing a configuration of a transmission 27 and a rotation drive output unit 29 at 0. In the figure, the transmission 27 comprises a clutch mechanism 36 and an upper transmission mechanism 37 which are coaxially mounted on the same axis as the motor output shaft 34 of the hydraulic motor 26 and are sequentially mounted in a casing 35 downward. And a lower speed change mechanism 38. The clutch mechanism 36 includes a fixed-side clutch plate of a first wet multi-plate clutch 36a on the high-speed rotation transmitting side of an inner peripheral portion fixed to the motor output shaft 34 side of the hydraulic motor 26, and the casing And a fixed-side clutch plate of the second wet-type multi-plate clutch 36b on the low-speed rotation transmitting side of the outer peripheral portion fixed to the 35-side, and combined with each fixed-side clutch plate to enable clutch coupling. An upper internal gear 37a which is a part of the upper speed change mechanism 37 on the inner peripheral surface of the output side end of the clutch operating member 39. Is formed. The upper transmission mechanism 37 also includes an upper sun gear 37b fixed to the motor output shaft 34 and an upper internal gear 37a of the clutch operating member 39.
An upper output shaft 40 holding an upper planetary gear 37c meshing with both of them is arranged, and becomes a part of the lower transmission mechanism 38 at the output side shaft end of the upper output shaft 40. A lower sun gear 38a is provided. On the other hand, the lower transmission mechanism 38 comprises a lower sun gear 38a for the upper output shaft 40 and the casing 3
A lower stage output shaft 41 holding a lower stage planetary gear 38c meshing with both a lower stage internal gear 38b fixed to the fifth side is arranged and provided at an output shaft end of the lower stage output shaft 41. First transmission gear 29 having a relatively small diameter and a small number of teeth
a is provided. The rotation drive output section 29 is provided with a second transmission gear 29b having a relatively large diameter and a large number of teeth meshing with the first transmission gear 29a.
The motor output of the hydraulic motor 26 is further reduced via b, and finally the earth auger 33 is rotationally driven at a predetermined high or low rotational force via the kelly bar 28. FIG. 3 is a hydraulic circuit diagram for inputting rotational drive to the transmission 27 and selecting a clutch. In the drawing, the upper revolving superstructure (23 in FIG. 1)
The hydraulic oil supplied from a main hydraulic pump (not shown) provided in the motor is branched via a manifold 42, one of which is supplied to a digging conduit 43 connected to the hydraulic motor 26, and the other is a shift gear to be described later. Is supplied to a speed change main body side conduit 45 connected to the main body side hydraulic motor 44. The shifting main body-side hydraulic motor 44 is connected to a shifting hydraulic pump 46 for shifting the transmission 27, and is configured to drive the shifting hydraulic pump 46 via the coupling 47. Have been. Therefore, the shift hydraulic pump 46 is formed in a separate circuit from the shift main body side pipe line 45, and pumps hydraulic oil into a shift hydraulic circuit 48 for shifting the transmission 27. Further, the hydraulic oil circulating in the transmission hydraulic circuit 48 includes the transmission 27
For example, ATF (Automatic Transmission Fluid), which is a lubricating oil used for lubrication of the transmission 27 in the casing 35 and suitable for lubrication of the transmission 27, is used. The speed change main body side hydraulic motor 44
The shift hydraulic pump 46 is driven by the hydraulic pump 46 to suck the lubricating oil stored in the casing 35 from the suction pipe 49 and pressurize the pressure oil to the discharge pipe 50 in the shift hydraulic circuit 48. Discharge, and the discharge pressure oil is supplied to the lubricating oil filter 5
1, the discharge pressure adjusting pipe 52 and the discharge pressure supply pipe 5
3 is divided into two systems. On the discharge pressure adjusting pipe 52 side, the discharge oil pressure is adjusted to an appropriate supply oil pressure for the clutch engagement operation by using a regulator 54, and then discharged to the casing 35 from the discharge pipe 55 again. . On the side of the discharge pressure supply line 53, the pressure-adjusted pressure oil is supplied to the first wet multi-plate clutch 3 of the clutch mechanism 36 by the switching selection of the electromagnetic switching valve 56.
6a (during excavation of the soil from the earth auger 33 by the high-speed rotation of the kelly bar 28) or operation of the second wet multiple disc clutch 36b (during excavation of the earth auger 33 by the low-speed rotation of the kelly bar 28). ), The clutch can be selectively supplied to any one of them, and the clutch engagement / disengagement operation can be performed by using, for example, a hydraulic actuator or the like. The drain of the pressure oil supplied to the clutch mechanism 36 is dropped downward, and the clutch mechanism 36 and the upper transmission mechanism 37 and the lower transmission mechanism 37 located below the clutch mechanism 36 are dropped. The lubricating oil 38 is lubricated, and the hydraulic oil after the lubrication is stored in the inner bottom 35a of the casing 35 for further circulating use. According to the structure of the transmission 27, the rotation drive output unit 29, and the transmission hydraulic circuit 48, the switching operation of the electromagnetic switching valve 56 operates as follows. That is, the first switching mechanism provided in the clutch mechanism 36 by the switching selection operation of the electromagnetic switching valve 56.
To the clutch operating member 3
9, the clutch operating member 3
9 is integrated with the motor output shaft 34 of the hydraulic motor 26 and is rotated together with the upper transmission mechanism 37, so that only the deceleration operation by the lower transmission mechanism 38 is performed here, Through the step 29, the earth auger 33 can be driven to rotate at a relatively high speed and a low torque for removing residual soil and the like. When the second wet multi-plate clutch 36b side of the clutch mechanism 36 is clutch-coupled to the clutch operating member 39 by the switching selection operation of the electromagnetic switching valve 56, the clutch operating member 39 is engaged. In order to be fixed to the casing 14, the deceleration operation by the upper transmission mechanism 37 and the deceleration operation by the lower transmission mechanism 38 are sequentially performed here. 33 can be driven to rotate at relatively low speed and high torque for excavating the ground. If the clutch mechanism 36 is not engaged, the upper speed change mechanism 37 is kept idling, and there is no output of rotational driving force. As described above, after supplying the hydraulic oil of the transmission hydraulic circuit 48 to the clutch transmission mechanism 36, the drain of the hydraulic oil is dropped downward, and the clutch transmission mechanism 36 and the upper gear Since the mechanism part 37 and the lower speed change mechanism part 38 are lubricated, and the lubricated hydraulic oil is stored in the casing 35 for further circulating use,
Thereby, sufficient lubrication is performed, so that it is not necessary to store a large amount of lubricating oil in the casing 35, and the casing 35 can be made compact.
Further, it is not necessary to separately provide a tank for the hydraulic oil of the shift hydraulic circuit 48. Thus, the casing 35 in which the transmission 27 is mounted and the rotation drive output section 29, the hydraulic motor 26 and the transmission-side hydraulic motor 44
And the transmission hydraulic pump 46 and the transmission hydraulic circuit 48 can be installed on the rotary frame 25 or the rotary table 30. Further, since the lubricating oil is circulated by the shift hydraulic circuit 48, a cooling effect of the lubricating oil can be expected. Further, since the transmission hydraulic circuit 48 is a separate circuit from the upper revolving unit 23, the piping and the like are not complicated, and it is necessary to install a lubricating oil unit on the upper revolving unit 23. Nor. Here, in the above-described embodiment, the case where the excavator driving device of the present invention is applied to a ground suspension excavator of a leader suspension type has been described. A similar effect can be obtained by applying the present invention to a ground excavator. Further, in the above configuration, a combination of one hydraulic motor, a transmission, and a rotation drive output unit is used, but a plurality of the units may be used in parallel.
By doing so, a stronger output torque can be obtained. The present invention can be variously modified without departing from the spirit of the present invention, and it goes without saying that the present invention extends to the modified ones. According to the present invention, as described in detail in the above embodiment, the transmission hydraulic circuit of the transmission provided in the excavator driving device of the ground excavator is provided with a hydraulic circuit for the upper revolving unit. Since the lubricating oil in the transmission is used as hydraulic oil in addition to a circuit separate from the circuit, appropriate lubricating oil for the transmission, for example, ATF (Automatic Transmission Fluid) is used as the lubricating oil. Can be. Further, the drainage of the operating oil acting on the clutch mechanism of the transmission is dropped on the clutch mechanism and the transmission mechanism of the transmission to lubricate the clutch mechanism and the transmission mechanism. Therefore, the clutch mechanism and the transmission mechanism are sufficiently lubricated, and therefore, a large amount of lubricating oil is stored in the casing of the transmission to infiltrate the transmission and lubricate the transmission. Therefore, the casing can be made compact. Therefore, the transmission and the transmission hydraulic circuit housed in the casing are reduced in size as a whole, and the transmission and the transmission hydraulic circuit are mounted on the rotary table or the rotary table provided in the excavator driving device. It can be installed on a rotary frame that supports a rotary table. Thus, the present invention provides a compact lubrication mechanism for lubricating a transmission provided in an excavator driving device of a ground excavator by using an appropriate lubricating oil to improve space efficiency. This is an invention that has an extremely great effect.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention and is a side view of a leader suspended ground excavator using an auger. FIG. 2 is a schematic cross-sectional view showing a configuration of a transmission and a rotation drive output unit of the excavator drive device of FIG. 1; FIG. 3 is a schematic diagram showing a transmission and a rotary drive output unit of the excavator driving device of FIG. 1 and a hydraulic circuit for the transmission. FIG. 4 shows a conventional example, and is a side view of a boom suspension type ground excavator using a shaft digging bucket. DESCRIPTION OF SYMBOLS 21 Ground excavator 22 Lower traveling unit 23 Upper revolving unit 24 Leader 25 Rotary frame 26 Hydraulic motor 27 Transmission device 28 Kelly bar 30 Rotary table 31 Winch 32 Rope 33 Earth auger 35 Casing 36 Clutch mechanism 48 Transmission hydraulic pressure Circuit 54 regulator

Claims (1)

(57) [Claims 1] An upper revolving structure is mounted on a lower traveling structure, and a support structure whose top is displaceable is erected on the upper revolving structure to support a rope fed out from a winch. Hanging from the top of the structure, hanging a kelly bar on the rope, furthermore, the kelly bar is rotatably and vertically supported by a rotary table driven by a hydraulic motor via a transmission,
In addition, in a ground excavator in which a shaft excavating bucket or an earth auger is connected to a lower end of the kelly bar, a clutch mechanism provided with an upper portion of a casing of the transmission, And a transmission mechanism provided below the clutch mechanism. The transmission hydraulic circuit of the transmission further includes a separate circuit from the main hydraulic circuit on the upper swing body side. Using the lubricating oil in the transmission as hydraulic oil, and applying the hydraulic oil regulated by a regulator interposed in the transmission hydraulic circuit to the clutch mechanism, The switching is performed, and the drain of the hydraulic oil that has acted on the clutch mechanism is dropped on the clutch mechanism and the transmission mechanism to lubricate the clutch mechanism and the transmission mechanism. And, then, the transmission device and the drilling device drive unit of the ground excavator, characterized in that arranged on the rotary frame the shifting hydraulic circuit for supporting the rotary table or the rotary table.