JP2011241540A - Driving device for construction machine rotation mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize with ease a storage of a driving device for a construction machine rotation mechanism including an electric motor within the construction machine compactly with avoiding interference with other equipment.SOLUTION: In a driving device for a construction machine rotation mechanism, a pinion 12 meshes with a ring gear 104 fixed to a lower body 101. Rotational driving force of an electric motor 11 fixed to an upper rotating body 102 is outputted from an output shaft 13 and is then inputted to an input shaft 14. A speed reduction part 16 is connected to the input shaft 14 and an output part 15 to which the pinion 12 is fixed. The rotational driving force inputted to the input shaft 14 is reduced its rotational speed to be transmitted and is then outputted to the output part 15. An input position changing unit 17 is capable of transmitting the rotational driving force from the output shaft 13 to the input shaft 14. The input position changing unit 17 is provided between the output shaft 13 and the input shaft 14 both arranged in such a manner that an axial direction C1 of the output shaft 13 and an axial direction C2 of the input shaft 14 are parallel to each other, thereby changes a position of an axial direction of the rotational driving force at inputting the rotational driving force outputted from the output shaft 13 to the input shaft 14.

Description

  INDUSTRIAL APPLICABILITY The present invention is used in a construction machine having a turning mechanism for turning an upper turning body arranged on an upper part of a lower body with respect to the lower body and an electric motor for turning, and turning the upper turning body with respect to the lower body. The present invention relates to a drive device for a construction machine turning mechanism to be driven.

  In a construction machine such as an excavator in which an upper swing body is disposed on an upper portion of a lower body configured as a lower traveling body, the swing machine has a swing mechanism for swinging the upper swing body with respect to the lower body and an electric motor for swing. Construction machines are known (see, for example, Patent Document 1). The construction machine disclosed in Patent Document 1 is configured as a hybrid construction machine including the turning mechanism, an engine for driving an actuator, and a motor generator provided as the electric motor. And in the construction machine of patent documents 1, while being provided with the hydraulic pump driven by the above-mentioned engine, the hydraulic actuator driven by the discharge oil from a hydraulic pump, the 1st electric motor, the 2nd electric motor, and the electrical storage device And are provided. The first electric motor is driven by the engine, and the electric power generated by the first electric motor is charged in the power storage device. Then, the second electric motor (turning electric motor) is driven by the electric power of the power storage device, and thereby the upper swing body is driven to swing relative to the lower body. Further, the second electric motor is provided as a motor generator that performs a power generation operation so that the inertia energy of the revolving structure is converted into electric energy and regenerated during the turning braking of the revolving structure. The electric power generated by the motor generator is charged in the power storage device.

  In the construction machine disclosed in Patent Document 1, a construction machine turning mechanism having an electric motor configured as the second electric motor and provided as a drive device for turning the upper turning body with respect to the lower body is provided. A drive device is provided. Also, Patent Document 2 discloses a drive device for a construction machine turning mechanism provided as a device for turning an upper turning body with respect to a lower body. A drive device for a construction machine turning mechanism disclosed in Patent Document 2 is an electric motor for turning, a pinion that meshes with a ring gear fixed to a lower body, and a rotational driving force from the electric motor is decelerated and output to the pinion. It is comprised as an apparatus which has a reduction part to perform.

Japanese Patent Laid-Open No. 2002-275945 (page 4-5, FIG. 1) JP 2000-104287 A (page 3, FIG. 3)

  As disclosed in Patent Literature 1 and Patent Literature 2, in a turning mechanism of a construction machine, a turning motor that generates a rotational driving force for turning the upper turning body with respect to the lower body is configured as an electric motor. Such a drive device is known. However, since a general electric motor has a large dimension in the height direction, if the electric motor is used as the above-described turning motor in the drive device of the construction machine turning mechanism, the size of the device is likely to increase, and the storage space is increased. In a limited construction machine, it is difficult to accommodate the drive device in a compact manner. That is, as disclosed in FIG. 3 of Patent Document 2, since the drive device for the construction machine turning mechanism is arranged so that the pinion meshes with the ring gear, the reduction unit that decelerates the rotational driving force output to the pinion On the other hand, the electric motor connected in series tends to protrude greatly inside the upper swing body. For this reason, in the construction machine, the drive device of the construction machine turning mechanism having an electric motor, other equipment such as various equipment such as hydraulic equipment and control equipment, the cab where the operator's driver's seat is installed, etc. There is a problem that it is difficult to accommodate compactly while avoiding interference.

  In view of the above circumstances, the present invention relates to a drive device for a construction machine turning mechanism that is used in a construction machine and has an electric motor, and accommodates compactly while avoiding interference with other equipment inside the construction machine. An object of the present invention is to provide a drive device for a construction machine turning mechanism that can be easily realized.

  A drive device for a construction machine turning mechanism according to the first aspect of the invention for achieving the above object comprises a turning mechanism for turning an upper turning body arranged on an upper part of a lower body with respect to the lower body and an electric motor. The present invention relates to a drive device for a construction machine turning mechanism that is used in a machine and drives the upper turning body to turn relative to the lower body. The drive device for the construction machine turning mechanism according to the first aspect of the invention includes a pinion that meshes with a ring gear fixed to the lower body, the electric motor fixed to the upper turning body, and rotation of the electric motor. An output shaft that outputs a driving force; an input shaft that receives a rotational driving force output from the output shaft; an output unit to which the pinion is fixed; and the input shaft and the output unit, A speed reduction unit that transmits the rotational driving force input to the shaft at a reduced speed and outputs it to the output unit, and the axial direction of the output shaft and the axial direction of the input shaft are arranged in parallel. The rotational axis of the rotational driving force when the rotational driving force output from the output shaft is input to the input shaft by being provided so as to be able to transmit the rotational driving force between the output shaft and the input shaft. Place of Characterized in that it comprises a an input position changing mechanism for changing the.

  According to the present invention, in a drive device for a construction machine turning mechanism used in a construction machine and having an electric motor, an input position capable of transmitting a rotational driving force between the output shaft on the electric motor side and the input shaft on the speed reduction unit side. A change mechanism is provided. The input position changing mechanism is arranged so that the axial direction of the output shaft on the electric motor side and the axial direction of the input shaft on the speed reduction unit side are parallel to each other, so that the rotational drive output from the output shaft The position of the rotational axis of the rotational driving force when the force is input to the input shaft is changed. For this reason, the electric motor is not arranged in series with respect to the speed reduction unit connected to the output unit to which the pinion meshing with the ring gear is fixed, but is arranged at a position where the rotation axis of the rotational driving force is shifted in parallel. The Therefore, the electric motor arranged in series with respect to the speed reduction unit like the driving device of the construction machine turning mechanism disclosed in Patent Document 2 greatly protrudes into the upper turning body and easily interferes with other equipment. Can be prevented. That is, while avoiding interference with other equipment such as various devices such as hydraulic equipment and control equipment, the driver's cab where the operator's driver's seat is installed, etc., about the drive device of the construction machine turning mechanism having an electric motor, It is possible to easily realize a compact housing inside the construction machine.

  Therefore, according to the present invention, in the drive device of the construction machine turning mechanism used in the construction machine and having the electric motor, it can be easily accommodated compactly while avoiding interference with other equipment inside the construction machine. it can.

  A drive device for a construction machine turning mechanism according to a second invention is the drive device for the construction machine turning mechanism according to the first invention, wherein the electric motor is disposed on the side where the speed reduction portion is disposed with respect to the input position changing mechanism. It is arranged on the opposite side.

  According to the present invention, the electric motor is not arranged in series with the speed reduction unit, but is arranged at a position where the rotational axis of the rotational driving force is shifted in parallel, and the speed reduction unit is arranged with respect to the input position changing mechanism. It is arranged on the opposite side to the side to be done. For this reason, the electric motor arranged at a position that does not overlap in the vertical direction with respect to the speed reduction unit is located in an area where there is room for the arrangement space inside the upper swing body (for example, the space below the driver's seat) Etc.) and can be accommodated compactly while avoiding interference with other equipment.

  A drive device for a construction machine turning mechanism according to a third aspect of the invention is the drive device for the construction machine turning mechanism according to the first aspect, wherein the electric motor is disposed on the side where the speed reduction portion is disposed with respect to the input position changing mechanism. It is arranged on the same side.

  According to the present invention, the electric motor is not arranged in series with the speed reduction unit, but is arranged at a position where the rotational axis of the rotational driving force is shifted in parallel, and the speed reduction unit is arranged with respect to the input position changing mechanism. It is arranged on the same side as the side to be done. For this reason, in the area below the input position changing mechanism, the electric motor can be arranged in parallel in a state of being arranged side by side with respect to the speed reducing portion, and the drive device can be accommodated compactly while avoiding interference with other equipment. This can be realized more easily. And according to this invention, an electric motor can be arrange | positioned within the range of the height dimension of the deceleration part in an up-down direction, and the further compactization of accommodation can be achieved. Alternatively, the electric motor can be arranged by effectively utilizing the space inside the ring gear fixed to the lower body, and the housing can be further compacted. In the case where the electric motor is arranged by effectively utilizing the space inside the ring gear, even if the electric motor has a dimension in the height direction larger than that of the speed reduction part (longer in the axial direction than the speed reduction part), It can be easily arranged.

  A drive device for a construction machine turning mechanism according to a fourth aspect of the present invention is the drive device for a construction machine turning mechanism according to any one of the first to third aspects, wherein the input position changing mechanism applies the rotational driving force of the output shaft. The transmission is decelerated with respect to the input shaft.

  According to the present invention, since the rotational driving force of the output shaft is decelerated and transmitted to the input shaft in the input position changing mechanism, the desired reduction ratio is efficiently shared not only by the speed reducing unit but also by the input position changing mechanism. The speed reduction ratio at the speed reduction unit can be set small (the amount of speed decelerated at the speed reduction unit can be set small). Thereby, size reduction of a deceleration part can be achieved and the further compact accommodation of a drive device can be implement | achieved.

  The drive device for a construction machine turning mechanism according to a fifth aspect of the invention is the drive device for the construction machine turning mechanism according to the fourth aspect of the invention, wherein the input position changing mechanism is a speed reduction portion side gear fixed to the input shaft, and the output shaft. And an electric motor side gear having a diameter smaller than that of the speed reducer side gear while being engaged with the speed reducer side gear.

  According to the present invention, the input position changing mechanism that decelerates the rotational driving force of the output shaft with respect to the input shaft is configured to include the speed reducer side gear and the electric motor side gear having a smaller diameter than the speed reducer side gear. For this reason, there are two gears that mesh with an input position changing mechanism that has a function of changing the position of the rotational axis of the rotational driving force when the rotational driving force output from the output shaft is input to the input shaft and also has a deceleration function. The mechanism can be realized with a simple configuration. Moreover, since it is provided as a simple mechanism using two meshing gears, it is possible to suppress a decrease in driving force transmission efficiency in the input position changing mechanism.

  ADVANTAGE OF THE INVENTION According to this invention, in the drive device of the construction machine turning mechanism which is used with a construction machine and has an electric motor, it can implement | achieve compactly accommodating, avoiding interference with other equipment inside a construction machine.

It is sectional drawing seen from the side which shows typically the construction machine with which the drive device of the construction machine turning mechanism which concerns on 1st Embodiment of this invention is used. It is a figure which expands and shows the drive device of the construction machine turning mechanism in FIG. 1, and its vicinity. It is sectional drawing seen from the side surface which shows typically the construction machine with which the drive device of the construction machine turning mechanism which concerns on a comparative example is used. It is sectional drawing seen from the side which shows typically the construction machine with which the drive device of the construction machine turning mechanism which concerns on 2nd Embodiment of this invention is used. It is a figure which expands and shows the drive device of the construction machine turning mechanism in FIG. 4, and its vicinity.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the embodiment of the present invention, an electric motor for turning provided as a turning mechanism, an engine for driving an actuator, and a motor generator for turning the upper turning body arranged on the upper portion of the lower body with respect to the lower body. However, the present invention is not limited to this example and can be widely applied. That is, the present invention is used in a construction machine having a turning mechanism for turning an upper turning body arranged on an upper part of a lower body with respect to the lower body and an electric motor for turning. The present invention can be widely applied to a drive device for a construction machine turning mechanism that is driven to turn.

(First embodiment)
FIG. 1 is a cross-sectional view schematically showing a shovel machine 100 to which a drive device 1 (hereinafter also simply referred to as “drive device 1”) of a construction machine turning mechanism according to a first embodiment of the present invention is applied. FIG. An excavator 100 shown in FIG. 1 has an upper swing body 102 that is pivotably disposed on an upper part of a lower body 101 that constitutes a lower travel body having a pair of travel crawlers 101a (only one crawler 101a is shown in FIG. 1). Has been. The shovel machine 100 includes a turning mechanism 103 for turning the upper turning body 102 with respect to the lower body 101, an actuator driving engine (not shown), and a turning electric motor provided as a motor generator. 11 as a hybrid construction machine. The shovel machine 100 is configured as a so-called mini excavator.

  The upper swing body 102 is provided with a driver's seat 106a for an operator who operates the excavator 100, a driver's cab 106 in which operating devices for operating an actuator described later are installed. Further, the upper swing body 102 is provided with a floor plate 107 on which the driver's seat 106a is installed, and a bottom plate 108 that is disposed below the floor plate 107 to form the bottom of the upper swing body 102 and on which the driving device 1 is installed. It has been.

  FIG. 2 is an enlarged view showing the drive device 1 of this embodiment and the vicinity thereof in FIG. As shown in FIGS. 1 and 2, the turning mechanism 103 of the excavator machine 100 includes the drive device 1, a ring gear 104, a turning bearing 105, and the like. The slewing bearing 105 includes an outer ring 105a, an inner ring 105b, a rolling element 105c, and the like. A circular through hole is formed in the bottom plate 108 of the upper swing body 102, and an outer ring 105 a is fixed to the bottom plate 108 at an edge portion of the through hole. In addition, an inner ring 105 b that is rotatably arranged via a rolling element 105 c with respect to the inner side of the outer ring 105 a is fixed to the lower body 101. The ring gear 104 formed in a ring shape and having teeth on the inner periphery is fixed to the inner periphery of the inner ring 105b. Thus, the ring gear 104 is fixed to the lower body 101 via the inner ring 105b.

  The drive device 1 is installed on the upper swing body 102 and is disposed so as to mesh with the ring gear 104 in the pinion 12. Then, when the driving device 1 operates as described later, the upper swing body 102 is driven to rotate with respect to the lower body 101. In FIG. 1, the rotation center line P during the turning operation of the upper turning body 102 is indicated by a one-dot chain line, and the turning direction of the upper turning body 102 around the rotation center line P is indicated by a double-ended arrow Q. Yes. In addition, when the upper swing body 102 is subjected to swing braking, the electric motor 11 in the drive device 1 is driven, so that the electric power generated as a motor generator is generated by converting the inertia energy of the upper swing body 102 into electric energy and regenerating. 11 will be performed.

  Further, in the excavator machine 100, a hydraulic pump (not shown) driven by the engine described above, a plurality of actuators provided on the revolving structure 102, and a generator (not shown) driven by the engine. And a power storage device (not shown) charged with power generated by the generator. The electric motor 11 provided as a motor generator is configured to be driven by the electric power supplied from the power storage device, and to charge the power storage device with the generated power during the turning braking of the upper swing body 102. Yes. The plurality of actuators are driven by pressure oil supplied from the hydraulic pump. In the shovel machine 100, a boom 109 driven by a hydraulic cylinder by the pressure oil, an arm (not shown), and a bucket (not shown) as an attachment are provided as a plurality of actuators.

  Next, the drive device 1 according to the present embodiment will be described in detail. As shown in FIGS. 1 and 2, the drive device 1 includes an electric motor 11, a pinion 12, an output shaft 13, an input shaft 14, an output unit 15, a speed reduction unit 16, an input position changing mechanism 17, and the like. ing.

  The electric motor 11 is provided as a motor generator as described above, and is fixed to the upper swing body 102. Note that the housing of the speed reduction unit 16 is fixed to the bottom plate 108 of the upper swing body 102 or the outer ring 105a fixed to the bottom plate 108, and the case 18 of the input position changing mechanism 17 fixed to the housing. In contrast, the electric motor 11 is fixed. Accordingly, the electric motor 11 is fixed to the upper swing body 102 via the speed reduction unit 16 and the input position changing mechanism 17.

  An output shaft 13 indicated by a broken line in FIG. 2 is provided as an output shaft portion of the electric motor 11 that outputs the rotational driving force of the electric motor 11, and a tip end side protrudes downward and a case of an input position changing mechanism 17 described later. 18 is arranged so as to protrude toward the inside. An input shaft 14 indicated by a broken line in FIG. 2 is provided as a shaft member to which the rotational driving force output from the output shaft 13 is input via the input position changing mechanism 17. The output unit 15 indicated by a broken line in FIG. 2 is provided as a part that is formed as, for example, an axial part and outputs the rotational driving force of the reduction part 16. And the output part 15 is arrange | positioned so that the front end side may protrude toward the downward direction of the deceleration part 16, and it may protrude inside the ring gear 104. FIG. A pinion 12 that meshes with the teeth on the inner periphery of the ring gear 104 is fixed to the outer periphery on the tip side of the output unit 15 through, for example, spline coupling.

  The speed reduction unit 16 is disposed in a space below the floor plate 107, that is, a space between the floor plate 107 and the bottom plate 108 in the upper swing body 102. Further, the speed reducing portion 16 is connected to the input shaft 14 at the upper end side and is connected to the output portion 15 at the lower end side, and is fixed to the bottom plate 108 or the outer ring 105a at the lower end portion of the housing as described above. Yes. The deceleration unit 16 is configured to decelerate and transmit the rotational driving force input to the input shaft 14 and to output it to the output unit 15. The reduction unit 16 includes, for example, a spur gear reducer configured with a spur gear, a planetary gear reducer configured with a sun gear, a planetary gear, and a planetary frame, a crankshaft, an external gear, and a carrier. It is comprised including the eccentric type reduction gear comprised including these, or the reduction gear etc. by these arbitrary combinations.

  The input position changing mechanism 17 is disposed in a space below the floor plate 107, that is, a space between the floor plate 107 and the bottom plate 108 in the upper swing body 102, and includes a case 18, a speed reduction unit side gear 19, an electric motor side gear 20, Etc. are provided. The case 18 is provided as a housing that accommodates the speed reducer side gear 19 and the electric motor side gear 20, and is arranged so that the end portions of the output shaft 13 and the input shaft 14 protrude inside. And the upper end part in the housing of the deceleration part 16 is being fixed to the lower surface side of the case 18, and the lower end part in the housing of the electric motor 11 is being fixed to the upper surface side of the case 18. Thereby, in the drive device 1, the electric motor 11 is configured to be arranged on the opposite side (upper side) to the input position changing mechanism 17 on the side (lower side) where the speed reduction unit 16 is arranged. Yes. Moreover, in the drive device 1, the electric motor 11 is disposed in a space below the driver's seat 106a. In the lower part of the driver's seat 106a, a notched portion is formed in the floor plate 107, and the electric motor 11 projects into the space below the driver's seat 106a through the notched portion in the floor plate 107. Has been placed.

  The speed reducer side gear 19 is provided as a spur gear or a helical gear fixed to the end of the input shaft 14. The electric motor side gear 20 is provided as a spur gear or a helical gear that is fixed to the end of the output shaft 13 and meshes with the speed reduction portion side gear 19 and has a smaller diameter than the speed reduction portion side gear 19. By providing the speed reducer side gear 19 and the electric motor side gear 20 configured as described above, the input position changing mechanism 17 reduces the rotational driving force of the output shaft 13 relative to the input shaft 14. Configured to communicate.

  Further, in the input position changing mechanism 17, the axial direction C1 of the output shaft 13 (the direction indicated by the broken line C1 in FIG. 2) and the axial direction C2 of the input shaft 14 (the direction indicated by the broken line C2 in FIG. 2) are parallel. Between the output shaft 13 and the input shaft 14 arranged in this manner, a rotational driving force can be transmitted. Thereby, the input position changing mechanism 17 changes the position of the rotational axis of the rotational driving force when the rotational driving force output from the output shaft 13 is input to the input shaft 14 from the axial direction C1 to the axial direction C2. It is configured.

  Next, the operation of the drive device 1 described above will be described. When the upper swing body 102 is driven to turn, the drive device 1 operates by operating the electric motor 11 driven by electric power supplied from a power storage device (not shown). When the operation of the electric motor 11 is started, the electric motor side gear 20 of the input position changing mechanism 17 is rotated together with the output shaft 11, and the reduction unit side gear 19 that is engaged with the electric motor side gear 20 is rotated. When the reduction gear 19 is rotated, the rotational driving force output from the electric motor 11 and having the rotational axis position changed from the axial direction C1 to the axial direction C2 is input to the input shaft 14 via the input position changing mechanism 17. The The rotational driving force input to the input shaft 14 is transmitted after being decelerated by the deceleration unit 16 and output from the output unit 15. As a result, a large torque is output from the pinion 12 meshing with the ring gear 104, and the upper swing body 102 is driven to swing relative to the lower body 101.

  On the other hand, during the turning braking of the upper turning body 102, the rotational driving force is transmitted in the opposite direction to the above. In other words, the driving force based on the inertial energy of the upper swing body 102 is input to the output unit 15 through the pinion 12, accelerated and transmitted by the speed reduction unit 16, and output from the input shaft 14. Electric power is generated in the electric motor 11 that is input to the output shaft 13 via the motor-side gear 20 and is being braked. The generated power is charged in a power storage device (not shown).

  As described above, according to the driving device 1, the input position changing mechanism 17 capable of transmitting the rotational driving force is provided between the output shaft 13 on the electric motor 11 side and the input shaft 14 on the speed reduction unit 16 side. The input position changing mechanism 17 is arranged so that the axial direction C1 of the output shaft 13 on the electric motor 11 side and the axial direction C2 of the input shaft 14 on the speed reduction unit 16 side are parallel to each other, so that the output shaft 13 is configured to change the position of the rotational axis of the rotational driving force when the rotational driving force output from 13 is input to the input shaft 14. For this reason, the electric motor 11 is not arranged in series with respect to the speed reduction unit 16 connected to the output unit 15 to which the pinion 12 meshing with the ring gear 104 is fixed, and the rotational axis of the rotational driving force is shifted in parallel. Placed in a different position. Therefore, the electric motor arranged in series with respect to the speed reduction unit like the driving device of the construction machine turning mechanism disclosed in Patent Document 2 greatly protrudes into the upper turning body and easily interferes with other equipment. Can be prevented.

  FIG. 3 is a cross-sectional view schematically showing the excavator machine 110 using the drive device 10 of the construction machine turning mechanism according to the comparative example in which the electric motor 11 is arranged in series with the speed reduction unit 16. is there. In the case of the drive device 10 according to the comparative example shown in FIG. 3, the electric motor 11 arranged in series with the speed reduction unit 16 protrudes greatly into the cab 106 of the upper swing body 102. For this reason, it becomes an obstacle when an operator performs a driving operation in the cab 106, and the function of the cab 106 is impaired. That is, the arrangement of the electric motor 11 causes interference with the cab 106. However, in the drive device 1, as described above, the electric motor 11 is not disposed in series with the speed reduction unit 16, but is disposed at a position where the rotational axis of the rotational driving force is shifted in parallel. For this reason, the drive device 1 having the electric motor 11 is accommodated in the shovel machine 100 in a compact manner while avoiding interference with other equipment such as hydraulic equipment and control equipment, the cab 106, and the like. Can be easily realized.

  Therefore, according to the present embodiment, in the drive device 1 of the construction machine turning mechanism that is used in the excavator machine 100 that is a construction machine and has the electric motor 11, while avoiding interference with other equipment inside the excavator machine 100. A compact housing can be easily realized.

  Further, according to the driving device 1, the electric motor 11 is not arranged in series with the speed reduction unit 16, but is arranged at a position where the rotational axis of the rotational driving force is shifted in parallel, and the input position changing mechanism 17 is arranged. On the other hand, it arrange | positions on the opposite side to the side by which the deceleration part 16 is arrange | positioned. For this reason, about the electric motor 11 arrange | positioned in the position which shifted | deviated with respect to the deceleration part 16 in the up-down direction, the area | region which has a margin as an arrangement | positioning space inside the upper turning body 102 (FIG.1 and FIG.2). As shown in the figure, it can be easily arranged (in the space below the driver's seat 106a, etc.) and can be accommodated compactly while avoiding interference with other equipment.

  Further, according to the driving device 1, the rotational driving force of the output shaft 13 is transmitted to the input shaft 14 while being decelerated to the input shaft 14 in the input position changing mechanism 17. The changing mechanism 17 can be efficiently shared, and the speed reduction ratio in the speed reduction unit 16 can be set small (the speed reduction speed of the speed reduction unit 16 can be set to be small). Thereby, the size reduction of the deceleration part 16 can be achieved and the further compact accommodation of the drive device 1 can be implement | achieved.

  In addition, according to the driving device 1, the input position changing mechanism 17 that decelerates the rotational driving force of the output shaft 13 with respect to the input shaft 14 is provided with the speed reducer side gear 19 and the electric motor side gear with a smaller diameter than the speed reducer side gear 19. 20. For this reason, the input position changing mechanism 17 having a function of changing the position of the rotational axis of the rotational driving force when the rotational driving force output from the output shaft 13 is input to the input shaft 14 is engaged with the two. A mechanism having a gear can be realized with a simple configuration. Moreover, since it is provided as a simple mechanism using two meshing gears, it is possible to suppress a decrease in driving force transmission efficiency in the input position changing mechanism 17.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 4 is a cross-sectional view schematically showing a shovel machine 200 to which the drive device 2 (hereinafter also simply referred to as “drive device 2”) of the construction machine turning mechanism according to the second embodiment is applied. . The excavator machine 200 shown in FIG. 4 is configured in the same manner as the excavator machine 100 of the first embodiment, but is not a driving device 1 but a driving device as a device that drives the upper turning body 102 to turn relative to the lower body 101. 2 is different. The drive device 2 includes the electric motor 11, the pinion 12, the output shaft 13, the input shaft 14, the output unit 15, the speed reduction unit 16, the input position changing mechanism 17, and the like, like the drive device 1 of the first embodiment. The arrangement of the electric motor 11 is different from that of the first embodiment. In the following description, the same components as those of the first embodiment are denoted by the same reference numerals in the drawings, and the description thereof is omitted. The arrangement of the electric motor 11 having a configuration different from that of the first embodiment will be described. .

  FIG. 5 is an enlarged view of the driving device 2 and the vicinity thereof in FIG. As shown in FIGS. 4 and 5, the upper end of the housing of the speed reduction unit 16 is fixed to the lower surface of the case 18 of the input position changing mechanism 17, and the upper end of the housing of the electric motor 11 is fixed. Yes. The electric motor 11 is disposed in the space below the floor plate 107, that is, in the space between the floor plate 107 and the bottom plate 108 in the upper swing body 102, similarly to the speed reduction unit 16. Further, the output shaft 13 is connected to the electric motor 11 at the upper end side thereof, and is arranged so that the distal end side protrudes upward and protrudes into the case 18. As described above, in the drive device 2, the electric motor 11 is configured to be disposed on the same side (lower side) as the side (lower side) where the speed reduction unit 16 is disposed with respect to the input position changing mechanism 17. Has been. Therefore, in the drive device 2, the electric motor 11, the speed reduction unit 16, and the input position changing mechanism 17 are all located in the space below the floor plate 107, that is, the space between the floor plate 107 and the bottom plate 108 in the upper swing body 102. Has been placed.

  According to the drive device 2 described above, the same effects as those of the drive device 1 of the first embodiment can be obtained. That is, according to the second embodiment, in the drive device 2 of the construction machine turning mechanism that is used in the excavator machine 200 that is a construction machine and has the electric motor 11, avoiding interference with other equipment inside the excavator machine 100. However, it can be easily accommodated compactly.

  According to the drive device 2, the electric motor 11 is not arranged in series with the speed reduction unit 16, but is arranged at a position where the rotational axis of the rotational driving force is shifted in parallel, and the input position changing mechanism 17 is arranged. On the other hand, it arrange | positions on the same side as the side by which the deceleration part 16 is arrange | positioned. For this reason, in the area below the input position changing mechanism 17, the electric motor 11 can be arranged in parallel with the speed reduction unit 16 in a state of being arranged on the side thereof, and the drive device is compact while avoiding interference with other equipment. 2 can be accommodated more easily. And according to this embodiment, the electric motor 11 can be arrange | positioned within the range of the height dimension of the deceleration part 16 in an up-down direction, and the further compactization of accommodation can be achieved.

  Although the first and second embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made as long as they are described in the claims. it can. For example, the following modifications can be made.

(1) In the first and second embodiments, the case of being used in a hybrid construction machine configured as an excavator has been described as an example, but this need not be the case. That is, the present invention may be applied to a drive device for a construction machine turning mechanism used in a hybrid construction machine other than a shovel machine, or may be a construction machine that is not a hybrid construction machine (any one other than a shovel machine and a shovel machine). It may be applied to a drive device for a construction machine turning mechanism used in the above. Therefore, the present invention can be applied to an electric excavator or a battery excavator using a commercial power source or the like, a crane equipped with a turning mechanism, and the like. In the first and second embodiments, a mini excavator has been described as an example of the excavator. However, this need not be the case, and the present invention may be applied to a 20t class excavator.

(2) In the first and second embodiments, the input position changing mechanism has been described as an example in which the rotational driving force of the output shaft is decelerated and transmitted to the input shaft, but this need not be the case. That is, the input position changing mechanism may transmit the rotational driving force of the output shaft to the input shaft without decelerating. Further, even when the input position changing mechanism decelerates and transmits the rotational driving force of the output shaft to the input shaft, the rotational driving force is decelerated and transmitted by a gear other than a spur gear or a helical gear. Form may be sufficient.

(3) In 2nd Embodiment, when an electric motor is arrange | positioned with respect to an input position change mechanism on the same side as a speed reduction part, an electric motor is arrange | positioned within the range of the height dimension of the speed reduction part in an up-down direction. Although the form has been described as an example, this need not be the case. When the electric motor is arranged on the same side as the speed reduction unit with respect to the input position changing mechanism, the electric motor is arranged by effectively utilizing the space inside the ring gear fixed to the lower body, and the accommodation is further changed. It may be a form that can be made compact. In addition, when the electric motor is arranged by effectively using the space inside the ring gear, the electric motor has a dimension in the height direction larger than that of the speed reduction part (longer in the axial direction than the speed reduction part). Can also be easily arranged.

  INDUSTRIAL APPLICABILITY The present invention is used in a construction machine having a turning mechanism for turning an upper turning body arranged on an upper part of a lower body with respect to the lower body and an electric motor for turning, and turning the upper turning body with respect to the lower body. The present invention can be widely applied as a drive device for a construction machine turning mechanism to be driven.

1 Excavator machine (construction machine)
DESCRIPTION OF SYMBOLS 11 Electric motor 12 Pinion 13 Output shaft 14 Input shaft 15 Output part 16 Deceleration part 17 Input position change mechanism 101 Lower body 102 Upper turning body 103 Turning mechanism 104 Ring gear

Claims (5)

Used in a construction machine having a turning mechanism for turning an upper turning body arranged on an upper part of the lower body with respect to the lower body and an electric motor for turning, and the upper turning body is driven to turn with respect to the lower body. A drive device for a construction machine turning mechanism,
A pinion meshing with a ring gear fixed to the lower body;
The electric motor fixed to the upper swing body;
An output shaft for outputting the rotational driving force of the electric motor;
An input shaft to which a rotational driving force output from the output shaft is input;
An output section to which the pinion is fixed;
A speed reducer coupled to the input shaft and the output unit, decelerating and transmitting the rotational driving force input to the input shaft, and outputting to the output unit;
By providing a rotational driving force between the output shaft and the input shaft arranged so that the axial direction of the output shaft and the axial direction of the input shaft are parallel to each other, the output An input position changing mechanism for changing the position of the rotational axis of the rotational driving force when the rotational driving force output from the shaft is input to the input shaft;
A drive device for a construction machine turning mechanism. A drive device for a construction machine turning mechanism according to claim 1,
The drive device for a construction machine turning mechanism, wherein the electric motor is arranged on the opposite side of the input position changing mechanism from the side on which the speed reduction unit is arranged. A drive device for a construction machine turning mechanism according to claim 1,
The drive device for a construction machine turning mechanism, wherein the electric motor is disposed on the same side as the side on which the speed reduction unit is disposed with respect to the input position changing mechanism. A drive device for a construction machine turning mechanism according to any one of claims 1 to 3,
The drive device for a construction machine turning mechanism, wherein the input position changing mechanism transmits the rotational driving force of the output shaft to the input shaft at a reduced speed. A drive device for a construction machine turning mechanism according to claim 4,
The input position changing mechanism includes a speed reduction unit side gear fixed to the input shaft, and an electric motor side gear fixed to the output shaft and meshing with the speed reduction unit side gear and having a smaller diameter than the speed reduction unit side gear. And a drive device for a construction machine turning mechanism.

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