Chassis of agricultural electric tracker

Abstract

The present invention relates to a chassis of an agricultural electric tractor. The chassis of an agricultural electric tractor, according to the present invention, has a front frame for supporting a battery and a rear frame to which a driving motor is coupled, wherein the front frame and the rear frame are fixed by a separate fixing means. According to the present invention, manufacturability and transportability of the chassis are improved.

Description

Chassis of an agricultural electric tractor

[0001] The present invention relates to a chassis that determines the overall structure of an agricultural electric tractor.

[0002] An agricultural tractor is a work vehicle that can perform various types of agricultural work by attaching and detaching multiple implements.

[0003] Agricultural tractors need to have a robust structure because they operate on rough terrain, such as slopes and wetlands. However, the chassis must be manufactured to be appropriately lightweight to enhance driving efficiency.

[0004] The structure of an agricultural tractor and the arrangement of its components are largely based on the chassis on which the components are mounted.

[0005] In conventional agricultural tractors, the engine, clutch, and transmission were directly connected in the front-rear direction.

[0006] The engine housing, clutch case, and transmission housing are constructed of metal with excellent mechanical strength. Therefore, the direct connection of the engine, clutch, and transmission forms the basic chassis of an agricultural tractor. A support frame is added to accommodate the various components mounted on the engine, completing the chassis.

[0007] Meanwhile, advances in battery technology are replacing diesel engines as the power source for agricultural tractors.

[0008] However, the battery case replacing a diesel engine cannot have the same mechanical strength or rigidity as the engine housing. This is because the battery itself carries a significant load, and the stable center of gravity of the agricultural tractor must also be considered.

[0009] Additionally, the battery-powered drive motor allowed for the elimination of the clutch. This necessitated a new chassis suitable for electric agricultural tractors.

[0010] Agricultural tractors are often exposed to rollover accidents due to their frequent center of gravity shifts, particularly when operating on rough terrain or depending on the type of implement. Therefore, the placement of components in agricultural tractors must be meticulously designed to ensure an optimal center of gravity, taking all possible circumstances into account. The chassis serves as the foundation for the design and placement of these components.

[0011] As mentioned earlier, advancements in battery technology are driving the widespread adoption of electric agricultural tractors. Consequently, there is a growing demand for chassis designs that ensure greater stability.

[0012] [Prior Art Literature]

[0013] [Patent Document]

[0014] (Patent Document 1) Republic of Korea Publication No. 10-2023-0062395

[0015] The present invention was conceived from concerns about a chassis that meets the needs of an agricultural electric tractor.

[0016] According to a first aspect of the present invention, a chassis of an agricultural electric tractor includes a front frame that supports a battery located above; and a rear frame that is arranged at the rear of the front frame and is coupled to the front frame by a separate fixing means; wherein the rear frame includes a left support plate that is provided on the left side in a longitudinal direction; a right support plate that is provided on the right side of the left support plate so as to form an installation space between the left support plate by being spaced apart from the left support plate by a predetermined distance; and a front support plate that connects a front end of the left support plate and a front end of the right support plate and is coupled to the front frame; wherein a motor case is arranged in the installation space, and a left side of the motor case is coupled to the left support plate, and a right side of the motor case is coupled to the right support plate.

[0017] The above installation space has a motor installation area where the motor case is installed and an inverter installation area where the inverter is installed in front of the motor installation area.

[0018] The above installation space has a motor installation area where the motor case is installed and a transmission installation area where a part of the transmission housing is installed, and a front end portion of the transmission housing is located in the transmission installation area, and a left side of the front end portion is coupled to the left support plate, and a right side of the front end portion is coupled to the right support plate.

[0019] The front frame includes a first side plate provided on the left side in a longitudinal direction; a second side plate provided on the right side of the first side plate and spaced apart from the first side plate by a predetermined distance in a longitudinal direction; a front connection plate connecting a front end of the first side plate and a front end of the second side plate; an axle assembly connecting the first side plate and the second side plate at a rear side of the front connection plate and to which a front axle is assembled; and a rear connection body coupled to the axle assembly and coupled to the rear frame.

[0020] The above rear-end assembly includes a floor plate forming a floor; and a rear-end reinforcement plate coupled to the rear end of the floor plate and facing the front support plate; wherein the rear-end reinforcement plate is coupled to the front support plate by a separate fixing means.

[0021] The rear-end assembly further includes a left reinforcing plate that is connected to the left end of the floor plate to reinforce resistance to longitudinal force applied to the floor plate; and a right reinforcing plate that is connected to the right end of the floor plate to reinforce resistance to longitudinal force applied to the floor plate.

[0022] The gap between the first side plate and the second side plate is wider than the gap between the left support plate and the right support plate.

[0023] A bracket frame for additionally fixing the rear frame to the front frame is further included, wherein the bracket frame includes a left bracket that is respectively coupled to the left reinforcement plate and the left support plate; a right bracket that is respectively coupled to the right reinforcement plate and the right support plate; and a gap maintaining plate that is coupled to the left bracket on the left side and to the right bracket on the right side to maintain a gap between the left bracket and the right bracket.

[0024] The left reinforcing plate and the right reinforcing plate are arranged between the first side plate and the second side plate, the left bracket is coupled to the left reinforcing plate between the left reinforcing plate and the first side plate, and the right bracket is coupled to the right reinforcing plate between the right reinforcing plate and the second side plate.

[0025] According to a second aspect of the present invention, a chassis of an agricultural electric tractor includes a front frame supporting a battery located above; a rear frame disposed at the rear of the front frame; and a bracket frame that is coupled to the front frame and the rear frame, thereby coupling the rear frame to the front frame; wherein the bracket frame includes a left bracket that is coupled to the left side of the front frame and the left side of the rear frame, respectively; a right bracket that is coupled to the right side of the front frame and the right side of the rear frame, respectively; and a gap maintaining plate that is coupled to the lower end of the left bracket on the left side and to the lower end of the right bracket on the right side, thereby maintaining a gap between the left bracket and the right bracket.

[0026] The front frame includes a first side plate provided on the left side in a longitudinal direction; a second side plate provided on the right side of the first side plate and spaced apart from the first side plate by a predetermined distance in a longitudinal direction; a front connection plate connecting a front end of the left support plate and a front end of the right support plate; an axle assembly connecting the first side plate and the second side plate at a rear of the front connection plate and to which a front axle is assembled; and a rear connection body coupled to the axle assembly and coupled to the rear frame; wherein the left bracket is coupled to the rear connection body between the first side plate and the rear connection body, and the right bracket is coupled to the rear connection body between the second side plate and the rear connection body.

[0027] The rear frame includes a left support plate provided on the left side in a long front-back direction; a right support plate provided on the right side of the left support plate in a long front-back direction; and a front support plate connecting a front end of the left support plate and a front end of the right support plate and coupled to the front frame; wherein the left bracket is coupled to the left support plate, and the right bracket is coupled to the right support plate.

[0028] According to a third aspect of the present invention, a chassis of an agricultural electric tractor includes a front frame supporting a battery located above; and a rear frame disposed at the rear of the front frame and coupled to the front frame by a separate fixing means; wherein the front frame includes a first side plate provided on the left side in a longitudinal direction; a second side plate provided at a predetermined distance from the first side plate and longitudinally provided on the right side of the first side plate in a longitudinal direction; a front end connecting plate connecting a front end of the first side plate and a front end of the second side plate; an axle assembly connecting the first side plate and the second side plate at a rear of the front end connecting plate and to which a front axle is assembled; and a rear end connecting body coupled to the axle assembly and coupled to the rear frame.

[0029] The rear end assembly includes a floor plate forming a floor; and a rear end reinforcing plate coupled to the rear end of the floor plate; and the rear frame is coupled to the rear end reinforcing plate by a separate fixing means.

[0030] The above floor plate has a through hole formed through which various connecting parts can pass in the vertical direction.

[0031] According to the present invention, the following effects are achieved.

[0032] First, the mechanical strength of the rear frame can be reinforced with the motor case and transmission housing, thereby improving the overall structural stability of the chassis.

[0033] Second, the heavy components such as the battery, inverter, drive motor, and transmission can be appropriately placed in the front-back direction without overlapping each other, so that the center of gravity of the agricultural electric tractor can be maintained stably.

[0034] Third, by placing the inverter between the battery and the drive motor, the installation of the electric cable can be made simple and easy.

[0035] Fourth, the inverter can be protected by the rear frame, so damage to the inverter can be minimized.

[0036] Fifth, since the front and rear frames are additionally connected by the bracket frame, the structural stability of the chassis is further improved.

[0037] Sixth, the manufacturing and transportability of the chassis are improved because the front and rear frames can be firmly connected by the rear assembly.

[0038] FIG. 1 is a schematic perspective view of a chassis of an agricultural electric tractor according to one embodiment of the present invention.

[0039] Figure 2 is an exploded perspective view of the chassis of Figure 1.

[0040] Fig. 3 is an excerpted perspective view of the front frame applied to the chassis of Fig. 1.

[0041] Figure 4 is an exploded view of the front frame of Figure 3.

[0042] Figure 5 is an exploded perspective view of the rear assembly applied to the front frame of Figure 3.

[0043] Figure 6 is an exploded view of the rear assembly of Figure 5.

[0044] Fig. 7 is an excerpted perspective view of the rear frame applied to the chassis of Fig. 1.

[0045] Fig. 8 is a plan view of the rear frame applied to the chassis of Fig. 1.

[0046] Figure 9 is a plan view of the front frame of Figure 3 and the rear frame of Figure 8 combined.

[0047] Fig. 10 is an excerpted perspective view of a bracket frame applied to the chassis of Fig. 1.

[0048] Figure 11 is an exploded view of the bracket frame of Figure 10.

[0049] Fig. 12 is a plan view showing an enlarged view of the joint portion of the bracket frame area of ​​Fig. 11.

[0050] Figures 13 to 16 are reference drawings for explaining the second installation space formed by the rear frame of Figure 7.

[0051] Figure 17 is a reference drawing for explaining the arrangement relationship of major components arranged on the chassis of Figure 1.

[0052] 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.

[0053] <Description of the basic configuration of the chassis>

[0054] FIG. 1 is a schematic perspective view of a chassis (100, hereinafter abbreviated as “chassis”) of an agricultural electric tractor according to one embodiment of the present invention, and FIG. 2 is an exploded perspective view of the chassis (100) of FIG. 1.

[0055] As shown in FIGS. 1 and 2, the chassis (100) includes a front frame (110), a rear frame (120), a bracket frame (130), and a plurality of fixing means (FM, bolts).

[0056] The front frame (110) supports a battery (not shown) located above.

[0057] As shown in the excerpted perspective view of FIG. 3 and the partially exploded view of FIG. 4, the front frame (110) may include a first side plate (111), a second side plate (112), a shear connecting plate (113), a stop reinforcement member (114), an axle assembly (115), and a rear coupling body (116).

[0058] The first side plate (110), the second side plate (120), and the shear connection plate (130) form the basic skeleton of the front frame (110) and are mutually connected in a 'ㄷ' shape that is open to the rear.

[0059] The first side plate (111) is positioned on the left side of the center line (CL) that crosses the center of the chassis (100) in the front-back direction, and is provided long in the front-back direction.

[0060] The second side plate (112) is provided on the right side of the first side plate (111), and more specifically, is positioned on the right side of the center line (CL).

[0061] The second side plate (112) is also provided long in the front-back direction.

[0062] For weight balance, it is preferable that the distance between the first side plate (111) from the center line (CL) and the distance between the second side plate (112) from the center line (CL) be the same.

[0063] The shear connecting plate (113) connects the shear of the first side plate (111) and the shear of the second side plate (112). Here, the shear needs to be broadly interpreted to mean the forward portion rather than the forward end.

[0064] The intermediate reinforcement member (114) connects the first side plate (111) and the second side plate (112) at the rear of the shear connecting plate (113). More specifically, the intermediate reinforcement member (114) connects the intermediate portion of the first side plate (111) and the intermediate portion of the second side plate (112) from the upper side. Thus, the intermediate portions of the first side plate (111) and the second side plate (112), which are long in the front-back direction, are reinforced. A damper (D, Damper) for somewhat elastically supporting the battery to be mounted on the upper side is coupled to the intermediate reinforcement member (114). In addition, dampers (D) for supporting the battery are also coupled to the first side plate (111) and the second side plate (112). For reference, it is sufficient if the number of dampers (D) is provided so that the battery can be stably supported while being balanced front-back and left-right.

[0065] A first installation space (IS1) can be formed between the shear connection plate (113) and the intermediate reinforcement member (114).

[0066] Various components can be placed in the first installation space (IS1), and it is particularly suitable for placing related components for a thermal management system that is larger in scale than other components.

[0067] The axle assembly (115) is provided for assembling the front axle (not shown).

[0068] The front axle can support the front frame (110) by being assembled to the axle assembly (115).

[0069] The axle assembly (115) is coupled to the first side plate (111) and the second side plate (112) so that it can be positioned at the bottom of the first side plate (111) and the second side plate (112).

[0070] The axle assembly (115) includes a first assembly plate (115a) and a second assembly plate (115b).

[0071] The first assembly plate (115a) is placed below the intermediate reinforcement member (114) and is joined to the first side plate (111) and the second side plate (112) in the left-right direction. Thus, the first assembly plate (115a) reinforces the intermediate portions of the first side plate (111) and the second side plate (112) together with the intermediate reinforcement member (114).

[0072] The second assembly plate (115b) is positioned at the rear of the first assembly plate (115a) and spaced apart from the first assembly plate (115a), and is joined to the first side plate (111) and the second side plate (112) in the left-right direction. Thus, the second assembly plate (115b) reinforces the first side plate (111) and the second side plate (112) at the rear ends of the first side plate (111) and the second side plate (112).

[0073] It is preferable that the front axle be connected to the first assembly plate (111) and the second assembly plate (112).

[0074] The rear assembly (116) is coupled to the axle assembly (115). More specifically, the rear assembly (116) is coupled to the second assembly plate (115b).

[0075] The rear assembly (116) is joined with a rear frame (120) and a bracket frame (130) to be described later.

[0076] As shown in the perspective view of FIG. 5 and the exploded view of FIG. 6, the rear assembly (116) includes a bottom plate (116a), a rear reinforcement plate (116b), a left reinforcement plate (116c), and a right reinforcement plate (116d).

[0077] The floor plate (116a) forms the floor of the rear assembly (116).

[0078] The floor plate (116a) is connected at its front end to the axle assembly (115). More specifically, the front end of the floor plate (116a) is connected to the second assembly plate (115b).

[0079] A through hole (TH) is formed in the floor plate (116a).

[0080] The through hole (TH) can be used to pass various pipes or cables, and is particularly suitable for passing cooling pipes or high-voltage cables.

[0081] The rear reinforcing plate (116b) is connected to the rear end of the floor plate (116a). A rear frame (120) is connected to this rear reinforcing plate (116b) by a separate fixing means (FM).

[0082] The left reinforcement plate (116c) is connected to the left end of the floor plate (116a).

[0083] The right reinforcement plate (116d) is connected to the right end of the floor plate (116a).

[0084] The left reinforcing plate (116c) and the right reinforcing plate (116d) have a wider width in the vertical direction than the floor plate (116a). Therefore, the left reinforcing plate (116c) and the right reinforcing plate (116d) reinforce the resistance to the longitudinal force applied to the floor plate (116a).

[0085] The left reinforcing plate (116c) and the right reinforcing plate (116d) can have their front ends joined to the second assembly plate (115b) and their rear ends joined to the rear reinforcing plate (116b).

[0086] The left reinforcing plate (116c) and the right reinforcing plate (116d) are arranged between the first side plate (111) and the second side plate (112). In addition, the left reinforcing plate (116c) and the first side plate (111) are spaced apart from each other, and the right reinforcing plate (116d) and the second side plate (112) are spaced apart from each other. In addition, the left reinforcing plate (116c) is provided with a bracket engaging protrusion (JP) protruding to the left, and the right reinforcing plate (116d) is provided with a bracket engaging protrusion (JP) protruding to the right. Of course, the bracket engaging protrusions (JP) may have a structure in which they are integrally formed with the left reinforcing plate (116c) or the right reinforcing plate (116d), or may have a structure in which they are manufactured separately and then joined to the left reinforcing plate (116c) or the right reinforcing plate (116d).

[0087] The bracket coupling protrusion (JP) is for coupling the bracket frame (130) to be described later.

[0088] The structural design of the bracket frame (130) can be made easier by the bracket coupling protrusion (JP) of the protruding structure, and the structural stability of the chassis (100) can be further pursued.

[0089] The rear frame (120) is placed at the rear of the front frame (110).

[0090] The rear frame (120) is connected to the front frame (110) at its front end by a separate fixing means (FM).

[0091] Referring to the excerpt of FIG. 7, a motor case (MC) and a transmission housing (TH) are combined in the rear frame (120). In addition, an axle tube (AH) on which a rear axle is installed is combined in the transmission housing (TH).

[0092] As shown in the plan view of Fig. 8, the rear frame (120) includes a left support plate (121), a right support plate (122), and a front support plate (123).

[0093] The left support plate (121), the right support plate (122), and the front support plate (123) form the basic skeleton of the rear frame (120) and are mutually connected in a ‘ㄷ’ shape that is open to the rear.

[0094] The left support plate (121) is placed on the left side of the center line (CL) and is long in the front-back direction.

[0095] The right support plate (122) is provided on the right side of the left support plate (121), and more specifically, is positioned on the right side of the center line (CL).

[0096] The right support plate (122) is also provided long in the front-back direction.

[0097] For left-right balance, it is desirable that the distance between the left support plate (121) from the center line (CL) and the distance between the right support plate (122) from the center line (CL) be the same.

[0098] The left support plate (121) and the right support plate (122) are spaced apart from each other by a certain distance. Accordingly, a second installation space (IS2) is formed between the left support plate (121) and the right support plate (122). Here, the second installation space (IS2) is a space for installing components that make up an agricultural electric tractor, and this will be described in more detail later in a different table of contents.

[0099] However, referring to the plan view of FIG. 9, the gap (G2) between the left support plate (121) and the right support plate (122) is narrower than the gap (G1) between the first side plate (111) and the second side plate (112). In other words, the gap (G1) between the first side plate (111) and the second side plate (112) is wider than the gap (G2) between the left support plate (121) and the right support plate (122). This design is intended to ensure proper arrangement and structural stability of various components installed in the front-rear direction. For example, a battery with a wider left-right width than a drive motor can be more stably supported by a front frame (110) with a relatively wider left-right width than a rear frame (120). And, a drive motor with a narrower left-right width than a battery can be more stably supported by a rear frame (120) with a relatively narrower left-right width than a front frame (110). Accordingly, manufacturing the front frame (110) and the rear frame (120) as a single unit is quite cumbersome and may compromise structural stability. Therefore, as in the present invention, by manufacturing the front frame (110) and the rear frame (120) separately and connecting them with separate fixing means, productivity and transportability can be improved.

[0100] The front support plate (123) connects the front end of the left support plate (121) and the front end of the right support plate (122). To this end, the left end of the front support plate (123) is coupled to the left support plate (121), and the right end of the front support plate (123) is coupled to the right support plate (122).

[0101] The front support plate (123) is connected to the front frame (110) by a separate fixing means (FM). More specifically, the front support plate (123) is connected to the rear reinforcing plate (116b) of the rear coupling body (116) in the front frame (110). That is, the rear frame (120) is connected to the rear reinforcing plate (116b) by the front support plate (123). For this purpose, the front support plate (123) and the rear reinforcing plate (116b) are arranged to face each other.

[0102] According to a preferred example, the rear frame (120) may further have a left side plate (124) and a right side plate (125).

[0103] The left side dam plate (124) is connected to the left side support plate (121), and the right side dam plate (125) is connected to the right side support plate (122).

[0104] The left side support plate (124) and the right side support plate (125) increase the resistance to the lateral force acting in the left-right direction or the longitudinal force acting in the up-down direction on the left support plate (121) and the right support plate (122).

[0105] The bracket frame (130) is provided to additionally secure the rear frame (120) to the front frame (110).

[0106] The bracket frame (130) connects the front frame (110) and the rear frame (120). In other words, the front frame (110) and the rear frame (120) can be additionally connected to each other by the bracket frame (130).

[0107] As shown in the perspective view of Fig. 10 and the exploded view of Fig. 11, the bracket frame (130) includes a left bracket (131), a right bracket (132), and a spacing plate (133).

[0108] Referring further to Fig. 12, which shows an enlarged view of the main joint parts in relation to the left bracket (131), the right bracket (132) and the spacing plate (133), the description is provided.

[0109] The left bracket (131) is connected to the left reinforcement plate (116c) and the left support plate (121), respectively.

[0110] The shear portion of the left bracket (131) can be positioned between the left reinforcing plate (116c) and the first side plate (111). In addition, the shear portion of the left bracket (131) is connected to the left reinforcing plate (116c) by a separate fixing means (FM). That is, the left bracket (131) is connected to the left reinforcing plate (116c) between the left reinforcing plate (116c) and the first side plate (111).

[0111] According to a preferred example, the left bracket (131) can be coupled to the bracket coupling protrusion (JP) on the left reinforcing plate (116c) by placing the left coupling plate (134) between the left bracket (131) and the bracket coupling protrusion (JP). Accordingly, the design of the coupling structure between the left bracket (131) and the left reinforcing plate (116c) can be facilitated.

[0112] In addition, since the left bracket (131) and the left reinforcing plate (116c) are joined on the inner side of the first side plate (111), the joining portion can be protected by the first side plate (111). Therefore, interference between any interfering object and the joining portion is reduced. In addition, the stable maintenance of the joining structure can be ensured to that extent.

[0113] The rear end of the left bracket (131) is connected to the left support plate (121) by a separate fixing means (FM).

[0114] According to a preferred example, the left bracket (131) can be connected to the left support plate (121) by posting a separate fastener (FI). Accordingly, the design of the connection structure between the left bracket (131) and the left support plate (121) can be facilitated.

[0115] The right bracket (132) is connected to the right reinforcement plate (116d) and the right support plate (122), respectively.

[0116] The shear portion of the right bracket (132) can be positioned between the right reinforcing plate (116d) and the second side plate (112). In addition, the shear portion of the right bracket (132) is coupled to the right reinforcing plate (116d) by a separate fixing means (FM). That is, the right bracket (132) is coupled to the right reinforcing plate (116d) between the right reinforcing plate (116d) and the second side plate (112).

[0117] According to a preferred example, the right bracket (132) can be coupled to the bracket coupling protrusion (JP) on the right reinforcing plate (116d) by placing the right coupling plate (135) between the bracket coupling protrusion (JP) and the right reinforcing plate (116d). Accordingly, the design of the coupling structure between the right bracket (132) and the right reinforcing plate (116d) can be facilitated.

[0118] For reference, the left joining plate (134) and the right joining plate (135) may also be manufactured as a single component of the bracket frame (130).

[0119] In addition, since the right bracket (132) and the right reinforcing plate (116d) are joined on the inner side of the second side plate (112), the joining portion can be protected by the second side plate (112). Therefore, interference between any interfering object and the joining portion is reduced. In addition, the stable maintenance of the joining structure can be ensured to that extent.

[0120] The rear end of the right bracket (132) is connected to the right support plate (122) by a separate fixing means.

[0121] According to a preferred example, the right bracket (132) can be connected to the right support plate (122) by posting a separate fastener (FI). Accordingly, the design of the connection structure between the right bracket (132) and the right support plate (122) can be facilitated.

[0122] The gap maintenance plate (133) maintains the gap between the left bracket (131) and the right bracket (132).

[0123] Referring again to FIGS. 10 and 11, the left side of the gap-maintaining plate (133) is coupled to the left bracket (131), and the right side of the gap-maintaining plate (133) is coupled to the right bracket (132). Thus, the gap between the left bracket (131) and the right bracket (132) is maintained. In addition, the gap-maintaining plate (133) increases the resistance to lateral forces that can be applied to the left and right brackets (131) and the right bracket (132) in the left and right directions.

[0124] Furthermore, the joint structure of the bracket frame (130) and the joint structure of the loader bracket (not shown) may be the same. In this case, the bracket frame (130) and the loader bracket may be mutually compatible.

[0125] A loader bracket is designed to install a loader on an agricultural electric tractor. A loader is a type of implement that can be installed on an agricultural electric tractor.

[0126] For example, when the rear reinforcement plate (116d) and the front support plate (121) are combined and the front frame (110) and the rear frame (120) are additionally combined by the bracket frame (130), it may be acceptable to temporarily disassemble the bracket frame (130). Accordingly, when a loader needs to be installed, the manager can easily install the loader by disassembling the bracket frame (130) and then combining the loader bracket.

[0127] However, if the front frame (110) and the rear frame (120) can be very firmly fixed by the rear reinforcing plate (116d) and the front support plate (123), the bracket frame (130) may be sufficiently omitted.

[0128] Likewise, it may also be sufficiently considered to connect the front frame (110) and the rear frame (120) using only the bracket frame (130).

[0129] <Description of the second installation space>

[0130] The second installation space (IS2) is formed by the structure of the rear frame (120).

[0131] The rear frame (120) is formed by interconnecting the left support plate (121), the right support plate (122), and the front support plate (123) to form a 'ㄷ' shaped structure. As shown in the plan view of Fig. 13, the space between the left support plate (121) and the right support plate (122) is utilized as a second installation space (IS2).

[0132] The second installation space (IS2) is formed starting from the rear of the front support plate (123) to the rear ends of the left support plate (121) and the right support plate (122).

[0133] The second installation space (IS2) can be divided into a first installation area (A1), a second installation area (A2), and a third installation area (A3).

[0134] The first installation area (A1) is located between the second installation area (A2) and the third installation area (A3).

[0135] According to a preferred example, a drive motor (DM) is installed in the first installation area (A1), as shown in Fig. 14. Therefore, the first installation area (A1) can be referred to as a motor installation area. Naturally, the motor case (MC) forming the outer surface of the drive motor (DM) is placed in the first installation area (A1).

[0136] The motor case (MC) is connected to both the left support plate (121) and the right support plate (122) by means of fixing means (FM).

[0137] The left side of the motor case (MC) is coupled to the left support plate (121), and the right side of the motor case (MC) is coupled to the right support plate (122). Therefore, the motor case (MC) somewhat reinforces the rigidity of the left support plate (121) and the right support plate (122).

[0138] The second installation area (A2) is placed in front of the first installation area (A1).

[0139] According to a preferred example, an inverter (IV) is installed in the second installation area (A2) as shown in Fig. 15. Therefore, the second installation area (A2) can be referred to as an inverter installation area. Here, the inverter (IV) converts direct current from the battery into alternating current and supplies it to the drive motor (DM). In addition, the inverter (IV) is responsible for precise control of the drive motor (DM).

[0140] The driving efficiency, work efficiency, and speed of agricultural electric tractors are all significantly affected by the efficiency and performance of the inverter (IV). Furthermore, the inverter (IV) has various functions that protect the electrical system from overvoltage, overcurrent, and overtemperature. Therefore, the inverter (IV) is an expensive and critical component in agricultural electric tractors. However, because it consists of various electrical components, the inverter (IV) is relatively fragile. Therefore, damage to the inverter (IV) must be prevented as much as possible.

[0141] Referring briefly to FIG. 14, the left support plate (121) and the right support plate (122) may have support brackets (P) for installation of the inverter (IV). The support brackets (P) are provided at the bottom of the left support plate (121) and the right support plate (122).

[0142] The inverter (IV) can be connected to the support bracket (P) by being placed on the support bracket (P). Naturally, the support brackets (P) support the inverter (IV) installed in the second installation space (A2).

[0143] According to a preferred example, the left support plate (121), the right support plate (122), and the front support plate (123) are manufactured to a standard in which the width in the vertical direction is wider than the width in the horizontal direction. Therefore, when the inverter (IV) is installed in the second installation area (A2), it can be protected by the left support plate (121), the right support plate (122), and the front support plate (123).

[0144] Additionally, a drive motor (DM) is positioned at the rear of the inverter (IV). Therefore, the inverter (IV) is protected from interference from external objects in all directions, including front, back, left, and right. This also prevents damage to the inverter (IV).

[0145] The third installation area (A3) is located behind the first installation area (A1).

[0146] According to a preferred example, a transmission (TM) is installed in the third installation area (A3), as shown in Fig. 16. Therefore, the third installation area (A3) can be referred to as a transmission installation area. Naturally, the transmission housing (TH), which forms the outer surface of the transmission (TM), is placed in the third installation area.

[0147] The transmission housing (TH) is connected to both the left support plate (121) and the right support plate (122) by a fixing means (FM).

[0148] The left side of the transmission housing (TH) is combined with the left support plate (121), and the right side of the transmission housing (TH) is combined with the right support plate (122).

[0149] Typically, the transmission housing (TH) is manufactured to have very high mechanical strength. Therefore, the transmission housing (TH) can strongly reinforce the rigidity of the left support plate (121) and the right support plate (122).

[0150] In addition, the transmission housing (TH) can stably support the components mounted on top. In other words, the transmission housing (TH) has the mechanical strength to constitute a part of the chassis (100) on its own. Therefore, there is no need to extend the left support plate (121) and the right support plate (122) to the rear end of the transmission housing (TH).

[0151] According to the present embodiment, only the front end portion of the transmission housing (TH), which is a part of the transmission housing (TH), is placed in the third installation area (A3). In addition, the left side of the front end portion of the transmission housing (TH) is coupled to the left support plate (121), and the right side of the front end portion of the transmission housing (TH) is coupled to the right support plate (122). Accordingly, the rigidity of the chassis (100) can be maintained, while the lengths of the left support plate (121) and the right support plate (122) can be reduced, thereby reducing the weight of the chassis.

[0152] For reference, the rear of the transmission housing (TH) is directly connected to the axle tube (AH), where the rear axle is installed. The transmission housing (TH) and axle tube (AH) are often collectively referred to as the transmission housing.

[0153] Figure 17 shows the arrangement of major components when having a chassis (100) according to the present invention.

[0154] From front to rear, the battery (BM), inverter (IV), motor case (DC), transmission housing (TH), and axle tube (AH) are arranged sequentially. And when viewed in plan, the center line (CL) passes through the centers of the battery (BM), inverter (IV), motor case (MC), transmission housing (TH), and axle tube (AH).

[0155] In addition, the battery (BM), inverter (IV), and motor housing (MH) do not overlap each other in the vertical direction. That is, in the present invention, the battery (BM), inverter (IV), and motor housing (MH), which are relatively heavier than other components, are appropriately arranged in a row to evenly distribute the weight in the front-to-back direction.

[0156] Additionally, since the battery (BM), inverter (IV), and drive motor (DM) are arranged sequentially from front to rear, the length of the electric cable can be reduced and its connection can be made easier.

[0157] The above-described embodiments merely illustrate preferred examples of the present invention, and it may have various applications. Therefore, the present invention should not be construed as limited to the above-described content. Instead, the scope of the present invention should be construed within the scope of the separately described claims and their equivalents.

Claims

1. Front frame (110) supporting the battery (BM) located above; and A rear frame (120) is disposed at the rear of the front frame (110) and is coupled to the front frame (110) by a separate fixing means; The above rear frame (120) A left support plate (121) provided on the left side in a long forward-backward direction; A right support plate (122) formed by being spaced apart from the left support plate (121) by a certain distance to form an installation space (IS2) between the left support plate (121) and being provided long in the front-back direction on the right side of the left support plate (121); and It includes a front support plate (123) that connects the front end of the left support plate (121) and the front end of the right support plate (122) and is coupled to the front frame (110); A motor case (MC) is placed in the above installation space (IS2). The left side of the motor case (MC) is coupled to the left support plate (121), and the right side of the motor case (MC) is coupled to the right support plate (122). Chassis (100) of an agricultural electric tractor.

2. In paragraph 1, The above installation space (IS2) has a motor installation area where the motor case (MC) is installed and an inverter installation area where the inverter (IV) is installed in front of the motor installation area. Chassis (100) of an agricultural electric tractor.

3. In paragraph 1, The above installation space (IS2) has a motor installation area where the motor case (MC) is installed and a transmission installation area where a part of the transmission housing (TH) is installed. The front end of the above transmission housing (TH) is located in the transmission installation area, the left side of the front end is coupled to the left support plate (121), and the right side of the front end is coupled to the right support plate (122). Chassis (100) of an agricultural electric tractor.

4. In paragraph 1, The above front frame (110) A first side plate (111) provided on the left side in a long forward-backward direction; A second side plate (112) spaced apart from the first side plate (111) by a predetermined distance and provided long in the front-back direction on the right side of the first side plate (111); A shear connection plate (113) connecting the front end of the first side plate (111) and the front end of the second side plate (112); An axle assembly (115) that connects the first side plate (111) and the second side plate (112) at the rear of the shear connecting plate (113) and to which the front axle is assembled; and A rear end assembly (116) coupled to the axle assembly (115) and coupled to the rear frame (120); Chassis (100) of an agricultural electric tractor.

5. In paragraph 4, The above rear-end assembly (116) The floor plate (116a) forming the floor; and A rear reinforcing plate (116b) is coupled to the rear end of the above-mentioned floor plate (116a) and faces the front support plate (121); The above rear reinforcing plate (116b) is connected to the front support plate (121) by a separate fixing means. Chassis (100) of an agricultural electric tractor.

6. In paragraph 5, The above rear-end assembly (116) A left reinforcing plate (116c) that is connected to the left end of the floor plate (116a) to reinforce the resistance to longitudinal force applied to the floor plate (116a); and A right reinforcing plate (116d) is further included, which is connected to the right end of the floor plate (116a) and reinforces the resistance to longitudinal force applied to the floor plate (116a). Chassis (100) of an agricultural electric tractor.

7. In paragraph 6, The gap between the first side plate (111) and the second side plate (112) is wider than the gap between the left support plate (121) and the right support plate (122). Chassis (100) of an agricultural electric tractor.

8. In paragraph 7, It further includes a bracket frame (130) for additionally fixing the rear frame (120) to the front frame (110); The above bracket frame (130) A left bracket (131) each connected to the left reinforcing plate (116c) and the left support plate (121); A right bracket (132) each connected to the right reinforcement plate (116d) and the right support plate (122); and A gap maintaining plate (133) that maintains the gap between the left bracket (131) and the right bracket (132) by being connected to the left bracket (131) on the left side and the right bracket (132) on the right side; Chassis (100) of an agricultural electric tractor.

9. In paragraph 8, The left reinforcing plate (116c) and the right reinforcing plate (116d) are placed between the first side plate (111) and the second side plate (112). The above left bracket (131) is coupled to the left reinforcement plate (116c) between the left reinforcement plate (116c) and the first side plate (111), The above right bracket (132) is connected to the right reinforcement plate (116d) between the right reinforcement plate (116d) and the second side plate (112). Chassis (100) of an agricultural electric tractor.

10. Front frame (110) supporting the battery (BM) located above; A rear frame (120) positioned at the rear of the front frame (110); and A bracket frame (130) is coupled to the front frame (110) and the rear frame (120), thereby coupling the rear frame (120) to the front frame (110); The above bracket frame (130) A left bracket (131) that is respectively connected to the left side of the front frame (110) and the left side of the rear frame (120); A right bracket (132) coupled to the right side of the front frame (110) and the right side of the rear frame (120), respectively; and A gap maintaining plate (133) that maintains the gap between the left bracket (131) and the right bracket (132) by being connected to the lower end of the left bracket (131) on the left side and the lower end of the right bracket (132) on the right side; Chassis (100) of an agricultural electric tractor.

11. In paragraph 10, The above front frame (110) A first side plate (111) provided on the left side in a long forward-backward direction; A second side plate (112) spaced apart from the first side plate (111) by a predetermined distance and provided long in the front-back direction on the right side of the first side plate (111); A shear connection plate (113) connecting the front end of the left support plate (111) and the front end of the right support plate (112); An axle assembly (115) that connects the first side plate (111) and the second side plate (112) at the rear of the shear connecting plate (113) and to which the front axle is assembled; and It includes a rear end assembly (116) coupled to the axle assembly (115) and coupled to the rear frame (120); The above left bracket (131) is connected to the rear end joint (116) between the first side plate (111) and the rear end joint (116), The above right bracket (132) is connected to the rear end joint (116) between the second side plate (112) and the rear end joint (116). Chassis (100) of an agricultural electric tractor.

12. In paragraph 11, The above rear frame (120) A left support plate (121) provided on the left side in a long forward-backward direction; A right support plate (122) provided long in the front-back direction on the right side of the left support plate (121); and It includes a front support plate (123) that connects the front end of the left support plate (121) and the front end of the right support plate (122) and is coupled to the front frame (110); The above left bracket (131) is connected to the above left support plate (121), The above right bracket (132) is coupled to the above right support plate (122). Chassis (100) of an agricultural electric tractor.

13. Front frame (110) supporting the battery (BM) located above; and A rear frame (120) is disposed at the rear of the front frame (110) and is coupled to the front frame (110) by a separate fixing means; The above front frame (110) A first side plate (111) provided on the left side in a long forward-backward direction; A second side plate (112) spaced apart from the first side plate (111) by a predetermined distance and provided long in the front-back direction on the right side of the first side plate (111); A shear connection plate (113) connecting the front end of the first side plate (111) and the front end of the second side plate (112); An axle assembly (115) that connects the first side plate (111) and the second side plate (112) at the rear of the shear connecting plate (113) and to which the front axle is assembled; and A rear end assembly (116) coupled to the axle assembly (115) and coupled to the rear frame (120); Chassis (100) of an agricultural electric tractor.

14. In paragraph 13, The above rear-end assembly (116) The floor plate (116a) forming the floor; and It includes a rear reinforcing plate (116b) that is connected to the rear end of the above floor plate (116a); The above rear frame (120) is connected to the rear reinforcing plate (116b) by a separate fixing means. Chassis (100) of an agricultural electric tractor.

15. In paragraph 14, The above floor plate (116a) has a through hole (TH) formed through which various connecting parts can pass in the vertical direction. Chassis (100) of an agricultural electric tractor.

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