Power-generating apparatus for agricultural electric tractor

Abstract

The present invention relates to a power-generating apparatus for an agricultural electric tractor. According to the present invention, the power-generating apparatus for an agricultural electric tractor comprises: a first motor; a second motor; a reducer for reducing the rotational speed of rotary shafts according to the operation of the first motor and the second motor and outputting the reduced rotational speed; and a hydraulic pump for generating hydraulic power with rotational power, the rotational speed of which is reduced by the reducer. The reducer includes two reduction mechanisms for performing speed reduction independently of each other and a case for accommodating and supporting the two reduction mechanisms. The present invention, if applied, makes it possible to manufacture an electric tractor using a transmission for an internal combustion engine without developing a transmission dedicated to the electric tractor.

Description

Power generation unit for agricultural electric tractors

[0001] The present invention relates to a power generation device for an agricultural electric tractor.

[0002] An agricultural tractor is a work vehicle that can perform agricultural work by replacing multiple work machines.

[0003] Agricultural tractors require both rotary and hydraulic power for driving and operation. Therefore, their power generation system consists of an engine and a hydraulic pump.

[0004] Rotational power is used for the rotation of driving wheels and various rotations made in work machines.

[0005] Hydraulic power is used to operate various cylinders for the operation or operation of work equipment.

[0006] In conventional agricultural tractors equipped with internal combustion engines, rotational power is generated by the engine.

[0007] The rotational power generated by the engine is used to rotate the wheels, and some of it is branched off to the PTO (Power Take Off) shaft and used for the rotation required by the implement.

[0008] Part of the rotational power of the PT shaft is converted into hydraulic power by being provided by a hydraulic pump.

[0009] Recently, with the preference for environmental friendliness and advancements in battery technology, electric agricultural tractors (hereinafter referred to as “electric tractors”) have been developed.

[0010] In electric tractors, an electric motor powered by a battery generates the rotational power.

[0011] Traditional fossil fuels and internal combustion engines are replaced by batteries and electric motors in electric agricultural tractors.

[0012] Tractors are primarily driven on rough terrain rather than flat ground, so structural stability is important.

[0013] Tractors equipped with conventional internal combustion engines have achieved structural stability through a long development process, resulting in a comprehensive structure and layout. In contrast, research into the overall structure and layout for electric tractors is still in its infancy, requiring significant development time and costs.

[0014] Attempts are being made in parallel to replace internal combustion engines with electric motors in the overall configuration and layout of tractors equipped with conventional internal combustion engines.

[0015] To replace an internal combustion engine with an electric motor, there are several things to consider:

[0016] First, the electric motor's rotation speed is higher than that of the engine, so it does not fit with a conventional transaxle.

[0017] Second, it is difficult to directly connect the hydraulic pump, which was connected to the engine's PTO shaft, to the electric motor.

[0018] Third, the relationship between driving speed and PTO must be independent to perform various tasks, but using a single electric motor increases the complexity of the transmission structure because it requires multiple stages of the transmission.

[0019] There is a need for technology for a power generation device that can replace an internal combustion engine with an electric motor while using the overall configuration and layout of a conventional internal combustion engine transmission.

[0020] An agricultural electric tractor according to a first aspect of the present invention comprises: a first motor that outputs a first rotational power and has a first rotational shaft for outputting the first rotational power; a second motor that is provided separately from the first motor, outputs a second rotational power and has a second rotational shaft for outputting the second rotational power; a reducer that reduces and outputs the rotational speeds of the first and second rotational shafts according to the operation of the first motor and the second motor; and a hydraulic pump that has a third rotational shaft that rotates with the third rotational power reduced by the reducer and generates hydraulic power by the rotation of the third rotational shaft; wherein the reducer comprises: a first reduction mechanism that reduces and outputs the rotational speed of the first rotational shaft; a second reduction mechanism that reduces and outputs the rotational speed of the second rotational shaft and performs the reduction independently of the first reduction mechanism; And a case that supports the first reduction mechanism and the second reduction mechanism while housing the first reduction mechanism and the second reduction mechanism inside;

[0021] It further includes an extraction mechanism that extracts the third rotational power from the second reduction mechanism and transmits it to the hydraulic pump.

[0022] The above case supports the withdrawal mechanism while housing the withdrawal mechanism inside.

[0023] The reduction ratio of the first reduction mechanism and the reduction ratio of the second reduction mechanism are the same.

[0024] An agricultural electric tractor according to a second aspect of the present invention comprises: a first motor that outputs a first rotational power and has a first rotational shaft for outputting the first rotational power; a second motor that is provided separately from the first motor, outputs a second rotational power and has a second rotational shaft for outputting the second rotational power; a reducer that reduces and outputs the rotational speeds of the first and second rotational shafts according to the operation of the first motor and the second motor; a hydraulic pump that has a third rotational shaft that rotates with the second rotational power reduced by the reducer and generates hydraulic power by the rotation of the third rotational shaft; and an extraction mechanism that extracts rotational power from the reducer; wherein the reducer comprises: a first reduction mechanism that reduces and outputs the rotational speed of the first rotational shaft; and a second reduction mechanism that reduces and outputs the rotational speed of the second rotational shaft.

[0025] The first reduction gear includes: a first output shaft installed parallel to the first rotational shaft and outputting the fourth rotational power; a first transmission shaft installed parallel to the first rotational shaft and the first output shaft and for transmitting the rotational power of the first rotational shaft to the first output shaft; a first rotational gear coupled to the first rotational shaft and rotating together with the first rotational shaft; a first linkage gear that meshes with the first rotational gear and rotates in conjunction with the first rotational gear, and is coupled to the first transmission shaft and rotates together with the first transmission shaft; a first transmission gear that is disposed apart from the first linkage gear and is coupled to the first transmission shaft and rotates together with the first transmission shaft; and a first output gear that meshes with the first transmission gear and rotates in conjunction with the first transmission gear, and is coupled to the first output shaft and rotates together with the first output shaft.

[0026] The second reduction mechanism includes: a second output shaft installed parallel to the second rotational shaft and outputting the fifth rotational power; a second transmission shaft installed parallel to the second rotational shaft and the second output shaft and transmitting the rotational power of the second rotational shaft to the second output shaft; a second rotational gear coupled to the second rotational shaft and rotating together with the second rotational shaft; a second linkage gear that meshes with the second rotational gear and rotates in conjunction with the second rotational gear, and is coupled to the second transmission shaft and rotates together with the second transmission shaft; a second transmission gear that is disposed apart from the second linkage gear and is coupled to the second transmission shaft and rotates together with the second transmission shaft; and a second output gear that meshes with the second transmission gear and rotates in conjunction with the second transmission gear, and is coupled to the second output shaft and rotates together with the second output shaft.

[0027] The above-mentioned extraction mechanism includes an extraction gear that is meshed with the second output gear and rotates in conjunction with the second output gear, and is coupled to the third rotational axis and rotates together with the third rotational axis.

[0028] The first rotation gear is arranged on a virtual first vertical plane perpendicular to the first rotation axis and the second rotation axis, the second rotation gear is arranged on a virtual second vertical plane perpendicular to the first rotation axis and the second rotation axis, the first vertical plane and the second vertical plane are spaced apart from each other, the first output gear is arranged on the second vertical plane, and the second output gear is arranged on the first vertical plane.

[0029] The first transmission gear set comprising the first transmission shaft, the first linkage gear, and the first transmission gear has the same specifications as the second transmission gear set comprising the second transmission shaft, the second linkage gear, and the second transmission gear.

[0030] The first coupling gear and the second transmission gear are arranged on an imaginary first vertical plane perpendicular to the first transmission axis and the second transmission axis, and the second coupling gear and the first transmission gear are arranged on an imaginary second vertical plane perpendicular to the first transmission axis and the second transmission axis, and the first vertical plane and the second vertical plane are separated from each other.

[0031] The first output gear set comprising the first output shaft and the first output gear has the same specifications as the second output gear set comprising the second output shaft and the second output gear.

[0032] The first output gear is arranged on a virtual second vertical plane perpendicular to the first output shaft and the second output shaft, and the second output gear is arranged on a virtual first vertical plane perpendicular to the first output shaft and the second output shaft, and the first vertical plane and the second vertical plane are separated from each other.

[0033] The above first rotation gear and the above second rotation gear have the same specifications.

[0034] The first reduction mechanism and the second reduction mechanism perform reduction independently of each other.

[0035] According to the present invention, it is possible to manufacture an electric tractor utilizing a transmission for an internal combustion engine without developing a transmission specifically for electric tractors.

[0036] FIG. 1 is a perspective view of the exterior of a power generation device of an agricultural electric tractor according to a first embodiment of the present invention.

[0037] Figure 2 is a power transmission diagram for explaining the power transmission performed in the power generation device of Figure 1.

[0038] Figure 3 is a conceptual structural diagram of a first reduction mechanism extracted from a reduction gear applied to the power generation device of Figure 1.

[0039] Figure 4 is a conceptual structural diagram of a second reduction mechanism extracted from the reduction gear applied to the power generation device of Figure 1.

[0040] Figure 5 is a conceptual structural diagram for explaining the arrangement of each gear applied to the power generation device of Figure 1.

[0041] Figures 6 and 7 are reference drawings for explaining a design for reducing the production cost of the power generation device of Figure 1.

[0042] Figure 8 is a power transmission diagram for a power generation device according to a second embodiment of the present invention.

[0043] Figure 9 is a power transmission diagram for a power generation device according to a third embodiment of the present invention.

[0044] Figure 10 is a power transmission diagram for a power generation device according to a third embodiment of the present invention.

[0045] A preferred embodiment according to the present invention is described with reference to the attached drawings, but for the sake of brevity, descriptions of well-known components are omitted or compressed as much as possible.

[0046] <First Embodiment>

[0047] FIG. 1 shows the external appearance of a power generation device (PGA, hereinafter abbreviated as “power generation device”) of an agricultural electric tractor according to a first embodiment of the present invention.

[0048] Figure 2 is a power transmission diagram for explaining the power transmission that occurs in a power generation device (PGA).

[0049] Referring to FIGS. 1 and 2, the power generation device (PGA) includes a first motor (100), a second motor (200), a reducer (300), and a hydraulic pump (400).

[0050] The first motor (100) outputs the first rotational power using electricity supplied from the battery.

[0051] The first motor (100) has a first rotational shaft (110) for outputting the first rotational power.

[0052] When the first motor (100) operates, the first rotational shaft (110) rotates and the first rotational power is output.

[0053] The first rotational power is used to drive the electric tractor.

[0054] The first rotational power output from the first motor (100) is supplied to the transmission (TA) via the reducer (300).

[0055] The first rotational power through the transmission (TA) is provided to the driving wheels (NW).

[0056] The second motor (200) outputs second rotational power using electricity supplied from the battery.

[0057] The second motor (200) has a second rotational shaft (210) for outputting a second rotational power.

[0058] When the second motor (200) operates, the second rotational shaft (210) rotates and the second rotational power is output.

[0059] The second rotation axis (210) is parallel to the first rotation axis (110).

[0060] The second rotational power is used to operate the hydraulic pump (400) and the work machine (WA) pulled by the electric tractor.

[0061] The second rotational power output from the second motor (200) is supplied to the hydraulic pump (400) and the work machine (WA) via the reducer (300).

[0062] The reducer (300) reduces the rotational speed of the first rotation shaft (110) and the second rotation shaft (210) according to the operation of the first motor (100) and the second motor (200) at a mechanically designed ratio and outputs the reduced speed.

[0063] The first rotational power according to the rotational speed output by being reduced from the reducer (300) is supplied to the transmission (TA).

[0064] The second rotational power according to the rotational speed output by being reduced from the reducer (300) is supplied to the hydraulic pump (400) and the work machine (WA).

[0065] The hydraulic pump (400) generates hydraulic pressure.

[0066] The hydraulic pump (400) operates with the second rotational power coming through the reducer (300).

[0067] The second rotational power is input to the third rotational axis (410).

[0068] The third rotation axis (410) is parallel to the first rotation axis (110) and the second rotation axis (210).

[0069] The hydraulic pump (400) generates hydraulic pressure by rotating the third rotational shaft (410) by the third rotational power that has been reduced by the second rotational power.

[0070] According to the present invention, the rotational power and hydraulic power provided by a conventional internal combustion engine can be realized at an equivalent level or higher through the first motor (100), the second motor (200), and the hydraulic pump (400) through which the reducer (300) is interposed.

[0071] The reducer (300) includes a first reduction mechanism (310), a second reduction mechanism (320), and a case (340).

[0072] The first reduction mechanism (310) reduces the rotational speed of the first rotational shaft (110) that inputs the first rotational power to the reduction gear (300) and outputs it.

[0073] The first rotational power output from the first motor (100) is transmitted to the transmission (TA) via the first reduction mechanism (310).

[0074] The first reduction gear (310) includes a first output shaft (311), a first transmission shaft (312), a first rotation gear (313), a first linkage gear (314), a first transmission gear (315), and a first output gear (316).

[0075] The first output shaft (311) is installed parallel to the first rotation shaft (110).

[0076] The first output shaft (311) outputs the fourth rotational power, which is the first rotational power reduced, to the transmission (TA).

[0077] The first transmission shaft (312) is installed parallel to the first rotation shaft (110) and the first output shaft (311).

[0078] The first transmission shaft (312) is interposed between the first output shaft (311) and the first rotation shaft (110) to transmit the rotational power of the first rotation shaft (110) to the first output shaft (311).

[0079] The first rotation gear (313) is coupled to the first rotation shaft (110).

[0080] The first rotation gear (313) rotates together with the first rotation shaft (110).

[0081] The first linkage gear (314) is meshed with the first rotation gear (313).

[0082] The first linkage gear (314) rotates in conjunction with the first rotation gear (313).

[0083] The first linkage gear (314) is coupled to the first transmission shaft (312).

[0084] The first linkage gear (314) rotates together with the first transmission shaft (312).

[0085] When the first linkage gear (314) rotates in conjunction with the first rotation gear (313), the first transmission shaft (312) rotates together with the first linkage gear (314).

[0086] The first transmission gear (315) is coupled to the first transmission shaft (312) like the first linkage gear (314).

[0087] The first transmission gear (315) rotates together with the first transmission shaft (312).

[0088] The first transmission gear (315) is placed apart from the first linkage gear (314).

[0089] The first output gear (316) is meshed with the first transmission gear (315).

[0090] The first output gear (316) rotates in conjunction with the first transmission gear (315).

[0091] The first output gear (316) is coupled to the first output shaft (311).

[0092] The first output gear (316) rotates together with the first output shaft (311).

[0093] When the first output gear (316) rotates in conjunction with the first transmission gear (315), the first output shaft (311) rotates together with the first output gear (316).

[0094] As the first output shaft (311) rotates together with the first output gear (316), the fourth rotational power is output toward the transmission (TA).

[0095] The first rotational power input to the first reduction mechanism (310) through the first rotational shaft (110) is sequentially converted into the fourth rotational power through the first rotational gear (313), the first linkage gear (314), the first transmission shaft (312), the first transmission gear (315), the first output gear (316), and the first output shaft (311) and outputted to the transmission (TA).

[0096] As the first rotational power moves from the first rotational shaft (110) to the first output shaft (311), the rotational speed is reduced.

[0097] Referring to the extract of FIG. 3 for the first reduction mechanism (310), the diameter (RGD1) of the first rotation gear (313) is smaller than the diameter (LGD1) of the first linkage gear (314).

[0098] The diameter (LGD1) of the first linkage gear (314) is larger than the diameter (RGD1) of the first rotation gear (313).

[0099] Deceleration occurs in the process in which the first rotational power moves from the first rotational shaft (110) to the first transmission shaft (312) through the first rotational gear (313) and the first linkage gear (314) that are mutually interconnected.

[0100] The diameter (LGD1) of the first linkage gear (314) is larger than the diameter (TGD1) of the first transmission gear (315).

[0101] The diameter (TGD1) of the first transmission gear (315) is smaller than the diameter (LGD1) of the first linkage gear (314).

[0102] The diameter (OGD1) of the first output gear (316) is larger than the diameter (TGD1) of the first transmission gear (315).

[0103] The diameter (TGD1) of the first transmission gear (315) is smaller than the diameter (OGD1) of the first output gear (316).

[0104] Deceleration occurs in the process of the first rotational power moving from the first transmission shaft (312) to the first output shaft (311) through the first transmission gear (315) and the first output gear (316) that are interlocked.

[0105] Therefore, in the process of moving the first rotational power from the first rotational shaft (110) to the first output shaft (311), deceleration is performed in two stages.

[0106] The rotational speed of the first output shaft (311) is reduced compared to the rotational speed of the first rotational shaft (110), and the first rotational power is output toward the transmission (TA).

[0107] If the reduction ratio is appropriately designed according to the mechanical structure of the first reduction mechanism (310), a conventional internal combustion engine transmission (TA) can be used as is while applying the first motor (100).

[0108] The second reduction mechanism (320) reduces the rotational speed during the process in which the second rotational power moves from the second rotational shaft to the second output shaft.

[0109] The second rotational power output from the second motor (200) is transmitted to the PTO shaft (S) via the second reduction mechanism (320).

[0110] The second reduction mechanism (320) independently performs reduction with respect to the first reduction mechanism (310).

[0111] The first reduction mechanism (310) and the second reduction mechanism (320) perform reduction independently of each other.

[0112] The second reduction mechanism (320) includes a second output shaft (321), a second transmission shaft (322), a second rotation gear (323), a second linkage gear (324), a second transmission gear (325), and a second output gear (326).

[0113] The second output shaft (321) is installed parallel to the second rotation shaft (210).

[0114] The second output shaft (321) outputs the fifth rotational power, which is the second rotational power reduced, to the PTO shaft (S).

[0115] The fifth rotational power output by the PT axis (S) is used to operate the work machine (WA) pulled by the electric tractor.

[0116] The second transmission shaft (322) is installed parallel to the second rotation shaft (210) and the second output shaft (321).

[0117] The second transmission shaft (322) is interposed between the second output shaft (321) and the second rotation shaft (210) to transmit the rotational power of the second rotation shaft (210) to the second output shaft (321).

[0118] The second rotation gear (323) is coupled to the second rotation shaft (210).

[0119] The second rotation gear (323) rotates together with the second rotation shaft (210).

[0120] The second linkage gear (324) is meshed with the second rotation gear (323).

[0121] The second linkage gear (324) rotates in conjunction with the second rotation gear (323).

[0122] The second linkage gear (324) is coupled to the second transmission shaft (322).

[0123] The second linkage gear (324) rotates together with the second transmission shaft (322).

[0124] When the second linkage gear (324) rotates in conjunction with the second rotation gear (323), the second transmission shaft (322) rotates together with the second linkage gear (324).

[0125] The second transmission gear (325) is coupled to the second transmission shaft (322) like the second linkage gear (324).

[0126] The second transmission gear (325) rotates together with the second transmission shaft (322).

[0127] The second transmission gear (325) is placed apart from the second linkage gear (324).

[0128] The second output gear (326) is meshed with the second transmission gear (325).

[0129] The second output gear (326) rotates in conjunction with the second transmission gear (325).

[0130] The second output gear (326) is coupled to the second output shaft (321).

[0131] The second output gear (326) rotates together with the second output shaft (321).

[0132] When the second output gear (326) rotates in conjunction with the second transmission gear (325), the second output shaft (321) rotates together with the second output gear (326).

[0133] As the second output shaft (321) rotates together with the second output gear (326), the fifth rotational power is output to the PTO shaft (S).

[0134] The second rotational power input to the second reduction mechanism (320) through the second rotational shaft (210) is sequentially converted into the fifth rotational power through the second rotational gear (323), the second linkage gear (324), the second transmission shaft (322), the second transmission gear (325), the second output gear (326), and the second output shaft (321) and output to the PTO shaft (S).

[0135] As the second rotational power moves from the second rotational shaft (210) to the second output shaft (321), the rotational speed is reduced.

[0136] Referring to the extract of FIG. 4 for the second reduction mechanism (320), the diameter (RGD2) of the second rotation gear (323) is smaller than the diameter (LGD2) of the second linkage gear (324).

[0137] The diameter (LGD2) of the second linkage gear (324) is larger than the diameter (RGD2) of the second rotation gear (323).

[0138] Deceleration occurs in the process of the second rotational power moving from the second rotational shaft (210) to the second transmission shaft (321) through the second rotational gear (323) and the second linkage gear (324) that are mutually interconnected.

[0139] The diameter (LGD2) of the second linkage gear (324) is larger than the diameter (TGD2) of the second transmission gear (325).

[0140] The diameter (TGD2) of the second transmission gear (325) is smaller than the diameter (LGD2) of the second linkage gear (324).

[0141] The diameter (OGD2) of the second output gear (326) is larger than the diameter (TGD2) of the second transmission gear (325).

[0142] The diameter (TGD2) of the second transmission gear (325) is smaller than the diameter (OGD2) of the second output gear (326).

[0143] Deceleration occurs in the process of the second rotational power moving from the second transmission shaft (322) to the second output shaft (321) through the second transmission gear (325) and the second output gear (326) that are mutually interconnected.

[0144] Therefore, in the process of moving the second rotational power from the second rotational shaft (210) to the second output shaft (321), a two-stage deceleration is performed.

[0145] The rotational speed of the second output shaft (321) is reduced compared to the rotational speed of the second rotational shaft (210), and the fifth rotational power is output to the PTO shaft (S).

[0146] According to the present invention, a withdrawal mechanism (420) is further included.

[0147] The extraction mechanism (420) extracts rotational power from the reduction gear (300). The second rotational power output from the second motor (200) is converted into third rotational power via the second reduction gear (320) and extraction mechanism (330) and transmitted to the hydraulic pump (400).

[0148] The withdrawal mechanism (420) includes a withdrawal gear (421).

[0149] The extraction gear (421) is coupled to the third rotation shaft (410).

[0150] The extraction gear (421) rotates together with the third rotation axis (410).

[0151] The third rotation axis (410) rotates together with the extraction gear (421).

[0152] The extraction gear (421) is meshed with the second output gear (326).

[0153] The extraction gear (421) rotates in conjunction with the second output gear (326).

[0154] When the take-out gear (421) rotates in conjunction with the second output gear (326), the third rotation shaft (410) rotates together with the take-out gear (421), thereby operating the hydraulic pump (400).

[0155] The second rotational power input to the second reduction mechanism (310) through the second rotational shaft (210) is sequentially converted into third rotational power through the second rotational gear (323), the second linkage gear (324), the second transmission shaft (322), the second transmission gear (325), the second output gear (326), and the take-out gear (421) and input to the hydraulic pump (400).

[0156] The diameter (DGD) of the take-out gear (421) is larger than the diameter (OGD2) of the second output gear (326).

[0157] The diameter (OGD2) of the second output gear (326) is smaller than the diameter (DGD) of the take-out gear (421).

[0158] In the process of the second rotational power moving to the third rotational axis (410) through the second output gear (326) and the take-out gear (421) that are mutually interconnected, the rotational speed is reduced.

[0159] As the second rotational power moves from the second rotational axis (210) to the third rotational axis (410), a three-stage deceleration of the rotational speed is performed.

[0160] The rotation speed of the third rotation shaft (410) is reduced compared to the rotation speed of the second rotation shaft (210), and the hydraulic pump (400) is operated by the third rotation power with the second rotation power reduced.

[0161] The third rotational power, in which the second rotational power is appropriately reduced in three stages through a mechanical design, is optimized for the operation of the hydraulic pump (400).

[0162] The case (340) supports the first reduction mechanism (310), the second reduction mechanism (320), and the withdrawal mechanism (420) while housing the first reduction mechanism (310), the second reduction mechanism (320), and the withdrawal mechanism (330) inside.

[0163] In this embodiment, the withdrawal mechanism (420) is arranged to be housed inside the case (340) and supported by the case (340), but the withdrawal mechanism (420) may also be implemented to be placed outside the case (340).

[0164] The case (340) can be manufactured by casting.

[0165] The present invention is also characterized by the arrangement of each gear (313 to 316, 323 to 326, 421) for efficient design of the space occupied by the power generation device (PGA).

[0166] In order to explain the layout features, it is necessary to consider a virtual first vertical plane (PS1) and a second vertical plane (PS2) that vertically cross the first rotation axis (110), the first transmission axis (312), the first output shaft (311), the second rotation axis (210), the second transmission axis (322), the second output shaft (321), and the third rotation axis (410) as shown in FIG. 5.

[0167] The first vertical plane (PS1) and the second vertical plane (PS2) are separated from each other in the anterior-posterior direction.

[0168] The first vertical plane (PS1) is located behind the second vertical plane (PS2).

[0169] On the first vertical plane (PS1), a first rotation gear (313), a first linkage gear (314), a second transmission gear (325), a second output gear (326), and a take-out gear (421) are arranged.

[0170] A second rotation gear (323), a second coupling gear (324), a first transmission gear (315), and a first output gear (316) are arranged on the second vertical surface (PS2).

[0171] The first rotation gear (313) and the second rotation gear (323) are arranged on different vertical planes (PS1, PS2).

[0172] The first linkage gear (314) and the second linkage gear (324) are arranged on different vertical planes (PS1, PS2).

[0173] The second transmission gear (325) and the first transmission gear (315) are arranged on different vertical planes (PS1, PS2).

[0174] The second output gear (326) and the first output gear (316) are arranged on different vertical planes (PS1, PS2).

[0175] Following the arrangement of FIG. 5, it contributes to designing the space occupied by the power generation unit (PGA) efficiently compared to an example in which all gears (313 to 316, 323 to 326, 331) are arranged on the same vertical plane.

[0176] In the arrangement of FIG. 5, the gears (313, 314, 325, 326, 421) arranged on the first vertical plane (PS1) and the gears (323, 324, 315, 316) arranged on the second vertical plane (PS2) can be arranged so that their areas overlap in the front-back direction.

[0177] Since the areas are arranged to overlap in the front-back direction, the installation area for the gears (313 to 316, 323 to 326, 421) of the first reduction mechanism (310) and the second reduction mechanism (320) that are not linked to each other can be minimized in the front or back view.

[0178] The arrangement as shown in Fig. 5 contributes to reducing the production cost by enabling the application of a reducer (300) with a minimized number of gears (313 to 316, 323 to 326, 421) in relation to a transmission (TA) or a pneumatic shaft (S) whose arrangement is confirmed on a conventional internal combustion engine tractor.

[0179] The present invention also features a design for reducing the production cost of a power generation device (PGA).

[0180] See Figure 6.

[0181] FIG. 6 illustrates a first transmission gear set (1TGS) composed of a first transmission shaft (312), a first linkage gear (314), and a first transmission gear (315), and a second transmission gear set (2TGS) composed of a second transmission shaft (322), a second linkage gear (324), and a second transmission gear (325).

[0182] Referring to (a) of Fig. 6, the first transmission gear set (1TGS) and the second transmission gear set (2TGS) produced have all the same specifications.

[0183] The first transmission shaft (312) and the second transmission shaft (322) have the same specifications in all respects, including their thickness and length (L1) in the front-rear direction.

[0184] The first linkage gear (314) and the second linkage gear (324) have the same specifications, including the diameter (LGD1, LGD2).

[0185] The diameter (LGD1) of the first linkage gear (314) and the diameter (LGD2) of the second linkage gear (324) are the same.

[0186] The first transmission gear (315) and the second transmission gear (325) have the same specifications, including the diameter (TGD1, TGD2).

[0187] The diameter (TGD1) of the first transmission gear (315) and the diameter (TGD2) of the second transmission gear (325) are the same.

[0188] Figure 6 (b) shows the arrangement when the first transmission gear set (1TGS) and the second transmission gear set (2TGS) are applied to the power generation device (PGA).

[0189] As shown in (a) of Fig. 6, the first transmission gear set (1TGS) and the second transmission gear set (2TGS) are identical products and are produced together on the same production line. However, as shown in (b) of Fig. 6, when applied to a power generation device (PGA), only the front-rear directions of the first transmission gear set (1TGS) and the second transmission gear set (2TGS) are arranged differently.

[0190] The first transmission gear set (1TDS) and the second transmission gear set (2TDS) can be produced on the same production line, thereby reducing production costs.

[0191] Figures 7 (a) and (b) show a first output gear set (1OGS) composed of a first output shaft (311) and a first output gear (316) and a second output gear set (2OGS) composed of a second output shaft (321) and a second output gear (326).

[0192] Referring to (a) of Fig. 7, the first output gear set (1OGS) and the second output gear set (2OGS) produced have all the same specifications.

[0193] The first output shaft (311) and the second output shaft (321) have the same specifications, including length (L2) and thickness.

[0194] The first output gear (316) and the second output gear (323) have the same specifications, including the diameter (OGD1, OGD2).

[0195] Figure 7 (b) shows the arrangement when the first output gear set (1OGS) and the second output gear set (2OGS) are applied to the power generation device (PGA).

[0196] The first output gear set (1OGS) and the second output gear set (2OGS) are identical items, and only the arrangement direction when applied to the power generation device (PGA) is different.

[0197] The first output gear set (1OGS) and the second output gear set (2OGS) can be produced on the same production line, thereby reducing production costs.

[0198] Furthermore, all specifications, including the diameters of the first rotation gear (110) and the second rotation gear (210), can be implemented identically. In this case, the reduction ratio of the first reduction mechanism (310) and the reduction ratio of the second reduction mechanism (320) are identical.

[0199] If the reduction ratio of the first reduction mechanism (310) and the reduction ratio of the second reduction mechanism (320) are implemented to be the same, the production line can be reduced by half and the production cost can be reduced.

[0200] <Second Embodiment>

[0201] Figure 8 shows a power transmission diagram for a power generation device (PGA) of an agricultural electric tractor according to a second embodiment of the present invention.

[0202] In the second embodiment, the extraction gear (421) is gear-meshed with the first output gear (316).

[0203] According to the second embodiment, the first rotational power generated from the first motor (100) is used to operate the hydraulic pump (400).

[0204] Considering the actual mechanical aspect, it is entirely possible to interpret the first reduction mechanism (310) to reduce the rotational speed of the second motor (200) for the work machine (WA) and output it, and the second reduction mechanism (320) to reduce the rotational speed of the first motor (100) for driving and output it.

[0205] <Third Embodiment>

[0206] Figure 9 shows a power transmission diagram for a power generation device (PGA) of an agricultural electric tractor according to a third embodiment of the present invention.

[0207] In the third embodiment, a hydraulic pump (400) is coupled to the second output shaft (321), and a take-out gear (421) is coupled to the PTO shaft (S).

[0208] <Fourth Embodiment>

[0209] Fig. 10 shows a power transmission diagram for a power generation device (PGA) of an agricultural electric tractor according to a fourth embodiment of the present invention.

[0210] In the fourth embodiment, the first vertical plane (PS1) on which the first rotation gear (313) is arranged is arranged forward of the second vertical plane on which the second rotation gear (323) is arranged.

[0211] The above-described embodiments are merely a few preferred examples, and the present invention may have various applications or modifications. Therefore, the present invention should not be construed as being limited to the above-described embodiments. Instead, the scope of the present invention should be construed in accordance with the separately stated claims and their equivalents.

Claims

1. A first motor (100) that outputs a first rotational power and has a first rotational shaft (110) for outputting the first rotational power; A second motor (200) provided separately from the first motor (100), outputting a second rotational power, and having a second rotational shaft (210) for outputting the second rotational power; A reducer (300) that reduces and outputs the rotational speed of the first rotation shaft (110) and the second rotation shaft (210) according to the operation of the first motor (100) and the second motor (200); and It includes a hydraulic pump (400) having a third rotational shaft (410) that rotates with a third rotational power reduced by the above reducer (300) and generates hydraulic power by the rotation of the third rotational shaft (410); and the reducer (300) A first reduction mechanism (310) that reduces the rotational speed of the first rotation shaft (110) and outputs it; A second reduction mechanism (320) that reduces the rotational speed of the second rotation shaft (210) and outputs the output, and performs the reduction independently with respect to the first reduction mechanism (310); and A case (340) that supports the first reduction mechanism (310) and the second reduction mechanism (320) while housing the first reduction mechanism (310) and the second reduction mechanism (320) therein; Power generation unit (PGA) of an agricultural electric tractor.

2. In paragraph 1, Further comprising an extraction mechanism (420) that extracts the third rotational power from the second reduction mechanism (320) and transmits it to the hydraulic pump (400); Power generation unit (PGA) of an agricultural electric tractor.

3. In paragraph 2, The above case (340) supports the withdrawal mechanism (330) while accommodating the withdrawal mechanism (420) inside. Power generation unit (PGA) of an agricultural electric tractor.

4. In paragraph 1, The reduction ratio of the first reduction mechanism (310) and the reduction ratio of the second reduction mechanism (320) are the same. Power generation unit (PGA) of an agricultural electric tractor.

5. A first motor (100) that outputs a first rotational power and has a first rotational shaft (110) for outputting the first rotational power; A second motor (200) provided separately from the first motor (100), outputting a second rotational power, and having a second rotational shaft (210) for outputting the second rotational power; A reducer (300) that reduces and outputs the rotational speed of the first rotation shaft (110) and the second rotation shaft (210) according to the operation of the first motor (100) and the second motor (200); A hydraulic pump (400) having a third rotational shaft (410) that rotates with a third rotational power reduced by the above-mentioned reducer (300), and generating hydraulic power by the rotation of the third rotational shaft (410); and It includes an extraction mechanism (420) for extracting rotational power from a reducer (300); The above reducer (300) A first reduction mechanism (310) that reduces the rotational speed of the first rotation shaft (110) and outputs it; and A second reduction mechanism (320) that reduces the rotational speed of the second rotation shaft (210) and outputs it; Power generation unit (PGA) of an agricultural electric tractor.

6. In paragraph 5, The above first reduction mechanism (310) A first output shaft (311) installed parallel to the first rotational axis (110) and outputting the fourth rotational power; A first transmission shaft (312) installed parallel to the first rotation shaft (110) and the first output shaft (311) and for transmitting the rotational power of the first rotation shaft (110) to the first output shaft (311); A first rotation gear (313) coupled to the first rotation axis (110) and rotating together with the first rotation axis (110); A first linkage gear (314) that is meshed with the first rotation gear (313) and rotates in conjunction with the first rotation gear (313), and is coupled to the first transmission shaft (312) and rotates together with the first transmission shaft (312); A first transmission gear (315) that is positioned apart from the first linkage gear (314) and is coupled to the first transmission shaft (312) and rotates together with the first transmission shaft (312); and A first output gear (316) that is meshed with the first transmission gear (315) and rotates in conjunction with the first transmission gear (315), and is coupled to the first output shaft (311) and rotates together with the first output shaft (311); Power generation unit (PGA) of an agricultural electric tractor.

7. In paragraph 6, The above second reduction mechanism (320) A second output shaft (321) installed parallel to the second rotational axis (210) and outputting the fifth rotational power; A second transmission shaft (322) installed parallel to the second rotation shaft (210) and the second output shaft (321) and transmitting the rotational power of the second rotation shaft (210) to the second output shaft (321); A second rotation gear (323) coupled to the second rotation axis (210) and rotating together with the second rotation axis (210); A second linkage gear (324) that is meshed with the second rotation gear (323) and rotates in conjunction with the second rotation gear (323), and is coupled to the second transmission shaft (321) and rotates together with the second transmission shaft (321); A second transmission gear (325) that is positioned apart from the second linkage gear (324) and is coupled to the second transmission shaft (322) and rotates together with the second transmission shaft (322); and A second output gear (326) that is meshed with the second transmission gear (325) and rotates in conjunction with the second transmission gear (325), and is coupled to the second output shaft (321) and rotates together with the second output shaft (321); Power generation unit (PGA) of an agricultural electric tractor.

8. In paragraph 7, The above withdrawal mechanism (420) A pull-out gear (421) that is meshed with the second output gear (326) and rotates in conjunction with the second output gear (326), and is coupled to the third rotation shaft (410) and rotates together with the third rotation shaft (410); Power generation unit (PGA) of an agricultural electric tractor.

9. In paragraph 7, The first rotation gear (313) is arranged on a virtual first vertical plane (PS1) perpendicular to the first rotation axis (110) and the second rotation axis (210), The second rotation gear (323) is arranged on a virtual second vertical plane (PS2) perpendicular to the first rotation axis (110) and the second rotation axis (210). The first vertical plane (PS1) and the second vertical plane (PS2) are separated from each other, The above first output gear (316) is arranged on the second vertical surface (PS2), The above second output gear (326) is arranged on the first vertical surface (PS1). Power generation unit (PGA) of an agricultural electric tractor.

10. In paragraph 7, The first transmission gear set (1TGS) composed of the first transmission shaft (312), the first linkage gear (314) and the first transmission gear (315) has the same specifications as the second transmission gear set (2TGS) composed of the second transmission shaft (322), the second linkage gear (324) and the second transmission gear (325). Power generation unit (PGA) of an agricultural electric tractor.

11. In paragraph 10, The first linkage gear (314) and the second transmission gear (325) are arranged on an imaginary first vertical plane (PS1) perpendicular to the first transmission shaft (311) and the second transmission shaft (321). The second linkage gear (324) and the first transmission gear (315) are arranged on a virtual second vertical plane (PS2) perpendicular to the first transmission shaft (311) and the second transmission shaft (321). The first vertical plane (PS1) and the second vertical plane (PS2) are separated Power generation unit (PGA) of an agricultural electric tractor.

12. In paragraph 7, The first output gear set (1OGS) composed of the first output shaft (311) and the first output gear (316) has the same specifications as the second output gear set (2OGS) composed of the second output shaft (321) and the second output gear (326). Power generation unit (PGA) of an agricultural electric tractor.

13. In paragraph 12, The first output gear (316) is arranged on a virtual second vertical plane (PS2) perpendicular to the first output shaft (311) and the second output shaft (321). The above second output gear (326) is arranged on a virtual first vertical plane (PS1) perpendicular to the first output shaft (311) and the second output shaft (321). The first vertical plane (PS1) and the second vertical plane (PS2) are separated Power generation unit (PGA) of an agricultural electric tractor.

14. In paragraph 7, The above first rotation gear (313) and the above second rotation gear (323) have the same specifications. Power generation unit (PGA) of an agricultural electric tractor.

15. In paragraph 5, The first reduction mechanism (310) and the second reduction mechanism (320) perform reduction independently of each other. Power generation unit (PGA) of an agricultural electric tractor.

Images