Power source support structure and crawler-type transport vehicle equipped with the same

Abstract

The present disclosure provides a novel configuration that enables an effective placement of a power source, such as an engine, in a crawler-type transporter. A power source support structure 12 for a crawler-type transporter 10 according to one embodiment includes a front support portion FS that is mounted on a main body frame 14 of a traveling device 18 and supports a front portion 22F of an engine body 22 of an engine E serving as a power source, and a rear support portion RS that is mounted on the main body frame 14 and supports a rear portion 22R of the engine body 22. The front support portion FS is positioned below the rear support portion RS and forward of a central axis 40C of a drive wheel 40 that is positioned at the front end of the crawler 16 in the vehicle longitudinal direction.

Description

[Technical Field]

[0001] The present disclosure relates to a power source support structure for a crawler transporter and a crawler transporter equipped with the power source support structure. [Background technology]

[0002] For example, crawler-type transport vehicles equipped with a traveling device consisting of endless tracks are used as transport vehicles for transporting lumber, earth, and sand in forests. In these crawler-type transport vehicles, hydraulic pressure is output to the traveling device or the bed lifting device by driving the engine, thereby allowing the vehicle to travel or the bed to be raised or lowered.

[0003] For example, Patent Document 1 discloses a crawler-type transport vehicle. In this transport vehicle, a control unit and a bonnet housing an engine are disposed on the upper front side of the main frame of a traveling device composed of a main frame and crawlers. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent No. 4214092 Summary of the Invention [Problem to be solved by the invention]

[0005] In recent years, crawler-type transporters have been used in an increasing number of situations, and their operating environments have become more diverse. Therefore, further improvements in the mobility of crawler-type transporters are expected. To achieve this, for example, a configuration that enables a low center of gravity in crawler-type transporters is desired. On the other hand, from the perspective of improving the cargo transporting capacity or ensuring better visibility for the driver, improvements are also expected in terms of securing space above or behind the engine of a crawler-type transporter.

[0006] The present disclosure has been made in consideration of the above circumstances, and aims to provide a novel configuration that enables a power source such as an engine to be effectively positioned in a crawler-type transporter. [Means for solving the problem]

[0007] One aspect of the present disclosure is A power source support structure for a crawler transporter including a main body frame, a traveling device including a crawler, and a power source supported on an upper front side of the traveling device, a front support portion provided on the main body frame and supporting a front portion of the power source; a rear support portion provided on the main body frame and supporting a rear portion of the power source; Equipped with the front support portion is positioned lower than the rear support portion and forward in the vehicle longitudinal direction than a central axis of a wheel positioned at a front end of the crawler; Power source support structure to provide.

[0008] According to the above aspect having the above configuration, the front support portion supporting the front portion of the power source is positioned lower than the rear support portion supporting the rear portion of the power source and is positioned forward in the vehicle longitudinal direction from the center axis of the wheel located at the front end of the crawler. This allows the power source to be effectively positioned by utilizing the space in front of the crawler. This reduces the vertical position of the power source, for example, allowing it to be more suitably lowered. This prevents the center of gravity of the crawler-type transporter from becoming too high, and preferably lowers it. This power source support structure also allows sufficient space to be secured above or behind the power source.

[0009] Preferably, the main frame includes parallel main frames and crawler frames disposed on the outside of the main frames on the left and right sides thereof and carrying the crawlers, and in this case, the front support portion includes lateral frames disposed on the main frames and extending in the vehicle width direction so as to intersect with the main frames, and the rear support portion includes inward extending portions disposed spaced apart on each of the main frames and extending inward between the main frames. This configuration makes it possible to position the rear portion of the power source between the main frames in a relatively low position relative to the front support portion, thereby more suitably lowering the center of gravity of the crawler transporter.

[0010] Preferably, the power source is an engine. The main body frame may include parallel main frames and crawler frames disposed on the left and right outer sides of the main frames, with the crawlers mounted on the respective sides. In this case, the engine may include an engine body, at least a majority of which is disposed between the main frames in the vehicle width direction, and an exhaust purification device disposed above one of the crawlers. This configuration allows for a larger space to be secured behind the engine body, thereby improving, for example, the ability to transport luggage and further enhancing the driver's visibility.

[0011] Preferably, when the power source is an engine, a front bracket for attaching the engine body to the front support part is attached to the front side of the engine body below the crank axis of the engine, and a rear bracket for attaching the engine body to the rear support part is attached to the rear side of the engine body in a vertically intermediate region including the crank axis of the engine body. This configuration allows the engine body to be positioned lower in accordance with the relatively low position of the front support part, thereby more suitably lowering the center of gravity of the crawler transporter. This configuration also allows the rear portion of the engine body to be firmly supported by the rear bracket, allowing for more stable attachment to the traveling device.

[0012] The present disclosure also resides in a crawler transporter equipped with the above-described power source support structure. [Effects of the Invention]

[0013] According to the above aspect of the present disclosure, the above configuration provides a novel configuration, which makes it possible to effectively arrange a power source in a crawler transporter. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a plan view of a crawler transporter according to one embodiment. [Figure 2] FIG. 2 is a front view of the crawler transporter of FIG. [Figure 3] FIG. 3 is a right side view of the crawler transporter of FIG. [Figure 4] FIG. 4 is a left side view of the crawler transporter of FIG. [Figure 5] FIG. 5 is a bottom view of the crawler transporter of FIG. [Figure 6] FIG. 6 is a rear view of the crawler transporter of FIG. [Figure 7] FIG. 7 is a plan view of the crawler-type transporter of FIG. 1 with various covers and the like removed. [Figure 8] 8 is a plan view of the main body frame of the crawler transporter of FIG. 1. FIG. [Figure 9] FIG. 9 is a front view of the main body frame of FIG. [Figure 10] 10 is a right side view of the main body frame of FIG. 8. FIG. [Figure 11] 11 is a left side view of the main body frame of FIG. 8. FIG. [Figure 12] 12 is a bottom view of the main body frame of FIG. 8. FIG. [Figure 13] 13 is a rear view of the main body frame of FIG. 8. FIG. [Figure 14] 14 is a perspective view of the front portion of the main body frame of FIG. 8. FIG. [Figure 15] 15 is a perspective view of the front portion of the main body frame of FIG. 8 from a different angle. [Figure 16] 16 is a plan view of a portion of the front side of the main body frame of FIG. 8 when the engine main body of the engine is disposed on the main body frame. [Figure 17] FIG. 17 is a front view of the engine body and its surroundings with the body frame removed in FIG. [Figure 18] FIG. 18 is a rear view of the engine body and its surroundings in FIG. [Figure 19] 19 is a left side view of the traveling device of the crawler transporter of FIG. 1 to which the engine body of FIG. 16 is attached. [Figure 20] 20 is a left side view showing the vicinity of the engine body in the traveling device with engine body of FIG. 19, and is a partial cross-sectional view. [Figure 21] FIG. 21 is a perspective view showing the vicinity of the engine body when various covers and the like are removed from the crawler transporter of FIG. [Figure 22] 22 is a perspective view and partial cross section showing the vicinity of the engine body in the traveling device with engine body of FIG. 19. FIG. [Figure 23] 23 is a rear view and partial cross-sectional view showing the vicinity of the engine body in the traveling device with engine body of FIG. 19. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. The same components (or configurations) are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

[0016] A crawler transporter 10 according to one embodiment of the present disclosure and a support structure (engine support structure) 12 for its power source, engine E, will be described with reference to the drawings. The engine support structure 12 corresponds to a power source support structure.

[0017] 1 to 6 are plan, front, right side, left side, bottom, and rear views of the crawler-type transporter 10. FIG. 7 is a plan view of the crawler-type transporter 10 with various covers and the like removed. FIGS. 8 to 13 are plan, front, right side, left side, bottom, and rear views of the main body frame 14 of the crawler-type transporter 10. FIGS. 14 and 15 are perspective views of the front portion of the main body frame 14. FIG. 16 is a plan view of the front portion of the main body frame 14 when the engine body 22 of the engine E is disposed on the main body frame 14. FIGS. 17 and 18 are front and rear views of the engine body 22 with its mounting brackets and dampers attached, i.e., when the main body frame 14 is removed from FIG. 16. Fig. 19 is a left side view of the engine body 22 attached to the traveling device 18, and Figs. 20 to 23 are views showing the vicinity of the engine body 22 on the traveling device 18. In the following description, "front," "rear," "up," "down," "right," and "left" are used to indicate directions or orientations based on the situation when the driver (or operator) sits in the driver's seat 20 facing forward in the vehicle's fore-and-aft direction. In the drawings, the symbol "UP" is used for the upper side in the up-and-down direction, the symbol "DW" is used for the lower side, the symbol "FR" is used for the front side in the vehicle's fore-and-aft direction, the symbol "RR" is used for the rear side, the symbol "RH" is used for the right side in the vehicle width direction, and the symbol "LH" is used for the left side.

[0018] First, the schematic configuration of crawler-type transporter 10 will be described with reference to Figures 1 to 7. Crawler-type transporter 10 includes traveling device 18, which is configured with main body frame 14 and crawlers 16, and engine E, which is supported on the upper front side of traveling device 18. Engine E is located inside hood 19 on the upper front side of traveling device 18. Engine E is a diesel engine in this case, has multiple cylinders, and is located on traveling device 18 so that its crank axis EC extends in the fore-and-aft direction of the vehicle. In this case, a crankshaft, which serves as an output shaft, is located below each cylinder. Engine E is not limited to this configuration and can have various other configurations.

[0019] The crawler 16 includes a left crawler (left crawler) 16L and a right crawler (right crawler) 16R, each of which forms an endless track. The traveling device 18 includes a left traveling device (left traveling device) 18L having the left crawler 16L and a right traveling device (right traveling device) 18R having the right crawler 16R. In the transporter 10, a driver's seat 20 is disposed above and in front of the left traveling device 18L, an engine body 22 of the engine E is disposed approximately in the center and above and in front of the left and right traveling devices 18L and 18R, and an exhaust purification device 24 for the engine E is disposed above and in front of the right traveling device 18R. Note that the arrangement of the engine E and the driver's seat 20 may be reversed.

[0020] A cargo bed 26 is disposed above the traveling device 18 and behind the engine E and the driver's seat 20. The space behind the engine E and the driver's seat 20 is not limited to being used as the cargo bed 26, but can be used for various other purposes. Although the cargo bed 26 is configured for transporting lumber and the like, it is not limited to this, and may also be configured for transporting earth and sand, for example.

[0021] As shown in Figure 7, the transporter 10 is equipped with a hydraulic control device having a hydraulic circuit OC. The hydraulic control device is equipped with a hydraulic pump 30 that outputs traveling hydraulic pressure to each of the left traveling unit 18L and the right traveling unit 18R when driven by the engine E, and outputs lifting hydraulic pressure to a hydraulic cylinder 28 of the bed lifting device. The hydraulic pump 30 is connected to the rear side of the engine body 22 of the engine E. By operating the hydraulic cylinder 28, the bed 26 can be rotated or raised and lowered around a support shaft at its rear.

[0022] The main body frame 14 of the traveling device 18 will be described mainly with reference to Figures 8 to 15. The main body frame 14 includes a main frame 32 that is parallel to the left and right sides, and crawler frames 34 disposed on the outer left and right sides of the main frame 32. The main frame 32 includes a left main frame (left main frame) 32L and a right main frame (right main frame) 32R. The crawler frame 34 includes a crawler frame (left crawler frame) 34L on the left side of the left main frame 32L, and a crawler frame (right crawler frame) 34R on the right side of the right main frame 32L. The left and right main frames 32L, 32R and the left and right crawler frames 34L, 34R are parallel to each other. Here, the main body frame 14 is arranged so that the left and right main frames 32L, 32R and the left and right crawler frames 34L, 34R extend substantially horizontally, but the present disclosure is not limited to this.

[0023] The main frame 14 is further provided with lateral frames 36, which extend in a direction intersecting the main frame 32 and crawler frame 34 extending in the longitudinal direction, more specifically in the vehicle width direction or left-right direction perpendicular to the longitudinal direction. The lateral frames 36 extend to connect at least the left and right main frames 32L, 32R. The lateral frames 36 include, in order from the front to the rear, a first lateral frame 36a located at the front edge of the front end, a second lateral frame 36b, a third lateral frame 36c, a fourth lateral frame 36d, a fifth lateral frame 36e, and a sixth lateral frame 36f located at the rear end, although the number and arrangement of the lateral frames 36 are optional. Each of the lateral frames 36 (36a, 36b, 36c, 36d, 36e, 36f) is provided so as not to tilt in the vertical direction. The second lateral frame 36 bare positioned in front of the crawler frame 34 (34L, 34R) in the vehicle longitudinal direction (see, for example, FIG. 12). The third to fifth horizontal frames 36c, 36d, 36e are provided at the crawler frame 34 in the longitudinal direction. The first horizontal frame 36a extends between the left and right main frames 32R, 32L at the front edges of the left and right main frames 32L, 32R to connect them and extends the left and right main frames 32R, 32L laterally. The second horizontal frame 36b extends between the left and right main frames 32R, 32L to connect them. The third horizontal frame 36c, the fourth horizontal frame 36d, and the fifth horizontal frame 36e connect the left and right main frames 32R, 32L, respectively, and extend beyond the left and right main frames 32R, 32L to the left and right crawler frames 34L, 34R (see FIG. 12 in particular). The sixth horizontal frame 36f extends between the left and right main frames 32L, 32R at their rear ends to connect the left and right main frames 32R, 32L. The first and sixth horizontal frames 36a, 36f are positioned at the height of the main frame 32, but are positioned above the second horizontal frame 36. b The first to fifth horizontal frames 36e are disposed so as to pass under the main frame 32 and are at substantially the same height as the crawler frame 34. Therefore, the main frame 32 is located higher than, or above, the crawler frame 34 in the up-down direction, i.e., vertical direction, and may be referred to as an upper frame, in which case the crawler frame 34 may be referred to as a lower frame 34. The main frame 14 also includes reinforcing or frame members 35a, 35b, 35c, etc.

[0024] Wheels, here drive wheels 40 (40L, 40R), are provided at the front ends of the crawlers 16 (16L, 16R). That is, the drive wheels 40 (40L, 40R) are provided at the front ends of the crawler frame 34. A motor mounting portion 38 is provided at the front end of the crawler frame 34 to which a hydraulic motor (not shown) for driving the crawler 16 is attached. The motor mounting portion 38 has a left motor mounting portion (left motor mounting portion) 38L for the left crawler 16L and a right motor mounting portion (right motor mounting portion) 38R for the right crawler 16R. Drive wheels 40L, 40R are attached to the hydraulic motors of the motor mounting portions 38L, 38R. As shown in FIGS. 3 and 4 , the left drive wheel 40L is attached to the hydraulic motor of the left motor mounting portion 38L, and the right drive wheel 40R is attached to the hydraulic motor of the right motor mounting portion 38R. As a result, the drive wheels 40R, 40L are provided at the front ends of the crawler frames 34 (34L, 34R), respectively. The motor mounting portion 38 and the drive wheels 40 are provided between the second horizontal frame 36b and the third horizontal frame 36c in the vehicle longitudinal direction.

[0025] In this way, the drive wheels 40 (40L, 40R) are positioned at the front end of each of the crawler frames 34 (34L, 34R). Each of the crawler frames 34 (34L, 34R) has a plurality of rollers 42 provided on its upper and lower sides, with an extendable idler frame 44 extending from its rear side and an idler 46 provided at its rear end. The crawlers 16 are then wound around the drive wheels 40 (40L, 40R), rollers 42, and idlers 46. In this case, each drive wheel 40 (40L, 40R) is the wheel located at the front end of the corresponding crawler 16 (16L, 16R) in the vehicle's fore-and-aft direction, more specifically, the wheel located furthest forward in the vehicle's fore-and-aft direction. Here, the crawlers 16 are rubber crawler belts, but are not limited to this.

[0026] The engine support structure 12 will now be described with reference to the drawings, particularly FIGS. 8, 14, 15, and 20. The engine body 22 of the engine E is supported by the second transverse frame 36b and left and right inner extensions 48L, 48R that extend inward from the left and right main frames 32L, 32R near the front of the third transverse frame 36c. The second transverse frame 36b functions as a front support FS that supports the front portion 22F of the engine body 22 and extends in the vehicle width direction intersecting the main frames 32 (32L, 32R) to connect the left and right main frames 32L, 32R. The inner extensions 48L, 48R function as rear support parts RS that support the rear portion 22R of the engine body 22 and are provided separately on each of the main frames 32 (32L, 32R) between the left and right main frames 32L, 32R. The inner extensions 48L, 48R are provided to extend at the same height in the vertical direction and are spaced apart from each other at roughly the same location in the longitudinal direction of the vehicle, facing each other. The inner extensions 48L, 48R are provided at substantially the same position as the third horizontal frame 36c in the longitudinal direction of the vehicle. The support structure 12 for the engine E in the crawler transporter 10 is configured with these front support parts FS and rear support parts RS. The second horizontal frame 36c, which functions as the front support part FS, b As described above, the inner extensions 48L, 48R, which function as rear support parts RS, are provided at a height that passes under the main frame 32, and are provided near the upper ends of the left and right main frames 32L, 32R, respectively.

[0027] As shown in FIGS. 8, 21, and 22, for example, the main frame 32 (32L, 32R) includes a front frame portion 32F having second horizontal frames 36b that serve as front support portions FS, and a rear frame portion 32B having inner extension portions 48L, 48R that serve as rear support portions RS. Here, the rear frame portion 32B constitutes more than half of the main frame 32, and the front frame portion 32F extends forward of the rear frame portion 32B. The main frame 32 includes a transition portion 32T that creates a difference in height from rear to front in the vehicle longitudinal direction, so that the front frame portion 32F is inclined lower than the rear frame portion 32B. In this embodiment, the front frame portion 32F is narrower than the rear frame portion 32B in the vertical direction and is positioned lower than the rear frame portion 32B in the vertical direction by the amount of the height reduction. As is clear from FIGS. 21 and 22, the transition portion 32T is located approximately at the same location as the drive wheels 40 (40L, 40R) in the vehicle longitudinal direction, and above the drive wheels 40 (40L, 40R) in the vertical direction.

[0028] As is clear from these descriptions, and as shown in FIGS. 14 to 23, and particularly in FIG. 20, the front support part FS is positioned lower than the rear support part RS in the up-down direction.

[0029] 19 and 20, and particularly as shown in Fig. 20, the front support part FS is positioned forward in the vehicle longitudinal direction of the central axes 40C of the drive wheels 40 (40L, 40R) located at the front ends of the crawlers 16. The rear support part RS is positioned rearward in the vehicle longitudinal direction of the central axes 40C of the drive wheels 40 (40L, 40R) at the front ends of the crawlers 16. Therefore, in relation to the fact that the front support part FS is positioned lower in the vertical direction than the rear support part RS as described above, the front support part FS is disposed in front of the crawlers 16 in a side view of the crawler transporter 10 (see Figs. 19 and 20).

[0030] 16, the engine body 22 is supported by the front support parts FS and rear support parts RS positioned as described above, and is disposed so that at least a majority of the engine body 22 is located, and here, is generally disposed, between the main frames 32 (32L, 32R) in the vehicle width direction. Referring to FIGS. 16, 17, 18, and 20 to 23, a front bracket 50 is attached to the front side of the engine body 22 so as to extend downward and forward, and rear brackets 52 (52L, 52R) are attached to the rear side of the engine body 22 so as to extend rearward to the left and right. The front bracket 50 includes a substantially H-shaped engine-side support member 60 having plate-like members 54, 56 on both sides that are directly attached to the front portion 22F of the engine body 22, and a connecting member 58 that extends in the vehicle width direction to connect the plate-like members 54, 56, and a frame-side member 62 to which the engine-side support member 60 is fixed by welding. The front portion 22F of the engine body 22 is placed and fixed on the second horizontal frame 36b via rubber dampers 64, 66 arranged on the lower side of the frame side member 62. Each rear bracket 52 (52L, 52R) is configured to have a fixing portion 52a attached to the rear side of the side of the rear portion 22R of the engine body 22, and a flat frame side portion 52b fixed to the fixing portion 52a and extending to the rear side of the engine body 22. The rear portion 22R of the engine body 22 is placed and fixed on the inner extending portions 48L, 48R via rubber dampers 68, 70 arranged on the lower side of the frame side member 52b. 20, the front bracket 50 for attaching the engine body 22 to the front support part FS is positioned on the lower front side of the engine body 22, below the crank axis EC, which is the output axis of the engine E, and the rear bracket 52 for attaching the engine body 22 to the rear support part RS is positioned on the rear side of the engine body 22, in an intermediate area EA in the up-down direction that includes the crank axis EC of the engine E. In the crawler transporter 10, the crank axis EC of the crankshaft of the engine body 22 extends in a substantially horizontal direction.

[0031] Some of the characteristic features of the crawler transporter 10 equipped with the engine support structure 12 having the above-described configuration and the resulting effects will be described below.

[0032] The crawler-type transporter 10 includes a traveling unit 18 having a main frame 14 and crawlers 16, and an engine E supported on the upper front side of the traveling unit 18. The engine support structure 12 of the crawler-type transporter 10 includes a second horizontal frame 36b that is attached to the main frame 14 and serves as a front support portion FS that supports a front portion 22F of an engine body 22 of the engine E, and inner extensions 48L, 48R that are attached to the main frame and serve as a rear support portion RS that supports a rear portion 22R of the engine body 22. The front support portion FS is positioned vertically lower than the rear support portion RS and forward in the vehicle longitudinal direction from a central axis 40C of a drive wheel 40, which is a wheel located at the front end of the crawler 16. Therefore, the engine support structure 12 of the crawler-type transporter 10 has an unprecedented, i.e., novel, configuration.

[0033] In the engine support structure 12 of the crawler-type transporter 10, the front support member FS supporting the front portion 22F of the engine body 22 is positioned lower than the rear support member RS ​​supporting the rear portion 22R of the engine body 22, and is positioned forward in the vehicle longitudinal direction from the center axis 40C of the drive wheel 40 located at the front end of the crawler 16. This allows the engine E, particularly the engine body 22, to be effectively positioned by utilizing the space S (see FIG. 20 ) in front of the crawler 16. This reduces the up-down (vertical) position of the engine body 22 of the engine E, and allows it to be lowered more appropriately than if the front support member FS were not positioned closer to or in the space S. This prevents the center of gravity of the crawler-type transporter 10 from becoming too high, and allows it to be lowered. This support structure 12 for the engine body 22 of the engine E also ensures sufficient space behind the engine E, specifically, the cargo bed space. By lowering the position of the engine body 22 in this way, sufficient space can be secured above the engine body 22, thereby further improving the visibility of the driver in the driver's seat 20.

[0034] In a side view of the crawler-type transporter 10 (e.g., FIGS. 3, 4, and 20), when a line EL is drawn along the lower-front portion 16p of the crawler 16 (16L, 16R) extending between the drive wheels 40 (40L, 40R), which are the wheels positioned furthest forward in the vehicle fore-and-aft direction among the crawlers 16 (16L, 16R), and the lower roller 42 adjacent to the drive wheels 40 (40L, 40R) closest to the front end, the front support portion FS supporting the front portion 22F of the engine body 22 is preferably positioned in an area above the line EL. This is to maintain favorable traveling performance of the crawler-type transporter 10. That is, in this example, the front support portion FS is positioned forward of the center axis 40C of the drive wheels 40 (40L, 40R) in the vehicle fore-and-aft direction and slightly above the center axis 40C. However, the front support portion FS may also be positioned on or below the center axis 40C. The line EL corresponds to a line drawn along the approach angle of the crawler 16 in a side view of the crawler transporter 10 (see FIGS. 3, 4, and 20).

[0035] The main frame 14 also includes main frames 32 arranged in parallel with each other, and crawler frames 34 on the left and right sides of the main frames 32, on which the crawlers 16 are mounted. The front support members FS are second horizontal frames 36b mounted on the main frames 32 and extending in the vehicle width direction intersecting the main frames 32, and the rear support members RS are inner extension members 48L, 48R extending inward between the main frames 32 and spaced apart from each other. This configuration allows the rear section 22R of the engine body 22 to be suitably positioned between the separated inner extension members 48L, 48R, which also allows for suitable placement of the hydraulic pump 30 connected to the rear section 22R of the engine body 22. This allows the entire engine body 22 to be positioned between the main frames 32 in accordance with the relatively low position of the front support members FS. This allows for a more suitable lowering of the center of gravity of the crawler-type transporter 10. It should be noted that the present disclosure does not exclude the case where the inner extending portions 48L, 48R are continuous and not separated.

[0036] Furthermore, the main body frame 14 includes main frames 32 and crawler frames 34 that are arranged parallel to the left and right, and the engine E includes an engine main body 22, at least a majority of which is disposed between the main frames 32 in the vehicle width direction, and an exhaust purification device 24 that is disposed above one of the crawlers 16, in this case the right crawler 16R. With this configuration, a larger space can be secured behind the engine main body 22, which can be more effectively utilized for the cargo bed 26, etc. Also, by positioning the exhaust purification device 24 on either the left or right side, in this case the right side, rather than on the rear and upper side of the engine main body 22, the visibility of the driver in the driver's seat 20 can be further improved.

[0037] Furthermore, the front bracket 50 for attaching the engine body 22 to the front support part FS is attached to the front side of the engine body 22, below the crank axis EC of the engine E in the vertical direction, and the rear bracket 52 for attaching the engine body 22 to the rear support part RS is positioned on the rear side of the engine body 22, and is attached to an intermediate area EA that includes the crank axis EC of the engine body 22 in the vertical direction. With this configuration, the engine body 22 can be positioned lower in accordance with the relatively low position of the front support part FS, thereby more suitably lowering the center of gravity of the crawler transporter 10. Furthermore, with this configuration, the rear portion 22R of the engine body 22 is firmly supported by the rear brackets 52 (52L, 52R), allowing the engine body 22 to be attached to the traveling device 18 more stably.

[0038] The front frame portion 32F of the main frame 32, which has the second horizontal frame 36b serving as the front support portion FS, and the rear frame portion 32B, which has the inner extension portions 48L, 48R serving as the rear support portion RS, may be configured to have a height difference relative to each other. In other words, the transition portion 32T of the main frame 32 may be configured to become lower from the rear to the front in the vehicle fore-and-aft direction so that the front frame portion 32F is positioned lower than the rear frame portion 32B in the up-and-down direction. With this configuration, the transition portion 32T is positioned according to the position of the drive wheel 40 in front of the crawler 16, thereby making it possible to more appropriately position the front support portion FS in the area in front of the crawler 16, i.e., the space S.

[0039] Although the embodiments and their modifications according to the present disclosure have been described above, the present disclosure is not limited thereto. Various substitutions and modifications are possible without departing from the spirit and scope of the present disclosure as defined by the claims of the present application. For example, the power source is not limited to the engine E, i.e., the engine body 22, but may have other configurations, such as an electric motor. Furthermore, in the crawler-type transporter 10 described above, the wheels at the front ends of the crawlers 16 are drive wheels, but the wheels at the rear ends of the crawlers 16 may be drive wheels. [Explanation of symbols]

[0040] 10 Crawler transport vehicle 12 Engine support structure (power source support structure) 14, 14L, 14R main frame 16, 16L, 16R Crawler 18, 18L, 18R running gear 20 Driver's seat 22 Engine body 24 Exhaust gas purification device 26 Cargo bed 28 Hydraulic Cylinder 30 Hydraulic pump 32, 32L, 32R main frame 34, 32L, 32R crawler frame 36, 36a, 36b, 3c, 36d, 36e, 36f Horizontal frame 38, 38L, 38R motor mounting part 40, 40R, 40L drive wheels 48, 48L, 48R Inner extension E-Engine FS front support RS rear support section

Claims

1. A power source support structure for a crawler-type transport vehicle comprising a running device having a main frame and crawlers, and a power source supported on the upper front side of the running device, A front support portion is provided on the main frame and supports the front portion of the power source, A rear support portion is provided on the main frame and supports the rear portion of the power source. Equipped with, The front support portion is positioned lower than the rear support portion and forward in the vehicle's longitudinal direction from the center axis of the wheel located at the front end of the crawler. Power source support structure.

2. The main frame comprises a main frame that is parallel to the left and right, and crawler frames that are disposed on the left and right outer sides of the main frame and on which the crawler is provided, The aforementioned front support portion is located on the lower side of the main frame. The power source support structure according to claim 1.

3. The main frame comprises a main frame that is parallel to the left and right, and crawler frames that are disposed on the left and right outer sides of the main frame and on which the crawler is provided, The main frame comprises a front frame section having the front support section and a rear frame section having the rear support section. The main frame has a transition section that creates a difference in height from rear to front in the longitudinal direction of the vehicle, such that the front frame section is inclined to be lower than the rear frame section. The power source support structure according to claim 1 or 2.

4. The main frame comprises a main frame that is parallel to the left and right, and crawler frames that are arranged on the left and right outer sides of the main frame and on which the crawler is provided. The aforementioned front support portion is provided on the main frame and includes a transverse frame that extends in the vehicle width direction and intersects the main frame. The rear support portion extends inward between the main frames and includes an inward extension portion provided separately from each of the main frames. The power source support structure according to claim 1.

5. The aforementioned power source is an engine, The main frame comprises a main frame that is parallel to the left and right, and crawler frames that are arranged on the left and right outer sides of the main frame and on which the crawler is provided. The engine comprises an engine body positioned at least half between the main frames in the vehicle width direction, and an exhaust purification device positioned above one of the crawlers. The power source support structure according to claim 1.

6. The front bracket for attaching the power source to the front support portion is attached to the lower front side of the power source. The rear bracket for attaching the power source to the rear support portion is located behind the power source. The power source support structure according to claim 1.

7. The aforementioned power source is an engine, The front bracket for attaching the engine body to the front support portion is attached to the front of the engine body, below the crank axis of the engine. The rear bracket for attaching the engine body to the rear support portion is positioned on the rear side of the engine body and is attached to an intermediate region of the engine body including the crank axis in the vertical direction. The power source support structure according to claim 6.

8. A crawler-type transport vehicle equipped with the power source support structure described in claim 1.

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