JPH09226621A - Frame structure for running vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a body part into compactness so as to realize reduction of a cost and improvement of a visual field, while ensuring strength of a supporting structure of a running part and a vibroisolating stricture of an engine room, in a running vehicle having a running device of king lateral space in a crawler tractor or the like. SOLUTION: A main frame 1 supporting a crawler running device is constituted by combination of right-left main frame 1R, 1L, connection frames 1a, 1h and a transmission case are screw locked between the right/left main frame 1R, 1L, an engine and an engine frame 2 mounting a body part of bonnet or the like of a tractor are loaded on the main frame 1, to be vibroisolation supported thereto.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frame structure for a traveling vehicle such as a crawler tractor in which a frame for supporting a vehicle body of a tractor is mounted on a frame for supporting a crawler traveling device.

[0002]

2. Description of the Related Art Conventionally, traveling vehicles in which the traveling portion is a crawler are disclosed in, for example, JP-A-4-260872 and JP-A-5-26072.
It is publicly known as shown in -254456.

[0003]

However, these are for supporting the traveling part and the vehicle body by an integral frame, and it is necessary to secure a certain distance between the crawlers in the traveling part. Along with this, the body part has been obliged to have a long shape on the left and right, and it has been forced to make the body part larger than necessary. In particular, the increase in size of the bonnet has been a factor that narrows the forward visibility of the worker. Also, since the frame that supports the large crawler traveling device has an integral structure, it is difficult to manufacture and maintain quality, and in terms of shape, the left and right crawlers tend to be twisted. A high-rigidity member is required to connect the left and right parts of the frame, which leads to weight increase and cost increase of the entire vehicle.

[0004]

The present invention uses the following means in order to solve the above problems. First of all, a second frame supporting a vehicle body having a short left-right interval is mounted on a first frame supporting a traveling device having a long left-right interval.

Secondly, a second frame for supporting the engine of the traveling vehicle is mounted on the first frame for supporting the crawler traveling device.

Thirdly, the first frame is composed of a combination of right and left separate frames.

Fourthly, the first frame is constructed by connecting the left and right separate frames with the transmission case and the connecting frame portion.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION A crawler tractor as an embodiment of the present invention will be described with reference to the accompanying drawings. FIG.
Is a side view of the entire crawler tractor adopting the frame structure of the present invention, FIG. 2 is a side view showing the frame structure of the crawler tractor, FIG. 3 is a plan view of the same, and FIG. 4 is a front end portion of the main frame 1 and the engine frame 3. FIG. 5 is a partial side sectional view showing the mounting structure of FIG. 5, and FIG. 5 is a side view showing a portion of the vibration-proof support frame portion 1c of the main frame 1.

The external appearance of the crawler tractor according to the present embodiment is as shown in FIG. 1, and its frame structure is, as shown in FIG. 1 and the like, a main frame as a first frame for supporting a traveling device, particularly a crawler traveling device here. The engine frame 2 is mounted on the frame 1 as a second frame for supporting the vehicle body part, particularly the tractor vehicle body part here.

First, the structure of the main frame 1 and the supporting structure of the traveling device thereof will be described with reference to FIGS. 1 to 3. As shown in a plan view 3, the main frame 1 mainly includes a left main frame 1L and a right main frame 1R,
Crawler frames 1La and 1Ra are vertically provided below the left and right main frames 1L and 1R, respectively. The front ends of the left and right main frames 1L and 1R are connected by a connecting frame part 1a having a U-shape in a side view which is open in the front, and front frame parts 1b and 1b are respectively extended forward.
The left and right front frame parts 1b and 1b are connected by a vibration-proof support frame part 1c, a front end connection frame part 1d, and a front weight support frame part 1e for locking the front weight FW. Positioning protrusions 1f are provided on the rear side of the left-right center portion of the front weight support frame portion 1e.

Left and right crawler frames 1La and 1Ra
Suspends the drive wheels 4 each equipped with a hydraulic motor for HST at the front end of the side surface thereof, and rolls the drive wheels 5 and 5 downward.
..., a tension roller 6 is suspended in the middle of the side surface, and an idler 7 is suspended at the rear end, and the crawlers 3 are wound to form left and right crawler traveling devices.

A connecting frame portion 1h is provided laterally between the left and right main frames 1L and 1R to enhance the connecting rigidity between the left and right main frames 1L and 1R. The front side of the connecting frame portion 1h is a space for disposing an oil pan vertically extending to the lower end of the engine E. In addition, immediately before the connecting frame portion 1h, on the left and right main frames 1L and 1R,
U-shaped anti-vibration support bracket part 1g / 1 open downward
g is projectingly provided, and the vibration-proof support brackets 9, 9 fixed to both side surfaces of the engine E are supported via vibration-proof rubbers 10, respectively. That is, the left and right anti-vibration support bracket portions 1g-1
The engine E is placed across the g. The engine E is mounted on the engine frame 2 which is the second frame, and the second frame is mounted on the main frame 1 which is the first frame for vibration-proof support.
And the first frame is not directly connected.

A transmission case TM is arranged between the rear ends of the left and right main frames 1L and 1R, and both side surfaces of the transmission case TM project from the rear portions of the left and right main frames 1L and 1R. The left and right main frames 1L and 1R are connected with high rigidity by the transmission case TM. The rear end of the left and right main frames 1L and 1R
It is screwed to the rear connecting frame portion 1j that connects the rear ends.

In manufacturing the main frame 1, the left and right main frames 1L and 1R (including the crawler frames 1La and 1Ra) are manufactured separately, and the connecting frame portion 1a is fixed to the main frame 1. The front frame portions 1b, 1b, etc. in front of the front frame portions are integrally formed with this. When the main frame 1 is completed, as shown in FIG. 3, the connecting frame portion 1a has a screw hole, and this portion is screwed to the front ends of the main frames 1L and 1R with bolts 13 and 13. Further, the connecting frame portion 1h and the rear end connecting frame portion 1j are arranged between the left and right main frames 1L and 1R, and both ends are provided on both main frames 1L and 1L.
Completed by screwing and connecting to 1R. In this way, in the processing stage, the left and right are processed separately, and they are screwed together and combined to complete, so that manufacturing and quality maintenance are facilitated.

When the drive system is assembled, the left and right main frames 1L and 1R are further connected via the connecting frame portions 1a and 1h and the transmission case TM, so that the connecting structure of the two is improved. The main frame 1 is provided with rigidity and has high durability.

As a transmission system from the engine E to the transmission case TM, at the rear end of the engine E, a steering shaft extending from the steering wheel 18 in the vicinity of the HST device, which is a traveling drive device of the traveling vehicle, and a gear shift operation lever. A steering gear box 8 in which an operation mechanism for levers such as (a lever for changing the discharge amount of the HST hydraulic pump P) is installed is arranged, and the HST hydraulic pump P (horizontal drive) arranged behind the steering gear box 8. The links L1 and L2 are connected to the hydraulic motors M and M provided on the wheels 4 and 4, respectively. The links L1 and L2 are operated by operating a lever connected to the steering gear box 8 to move the swash plate of the hydraulic pump P, and the steering gear box 8 and the hydraulic pump P are close to each other. The lengths of the links L1 and L2 are short, and the drive wheels 4 corresponding to the lever operation amount due to the bending of the links, etc.
The variation in the output of the hydraulic motor M is small. Then, the transmission case TM is disposed behind the hydraulic pump P.

From the steering gear box 8, the links L1 and L2, the hydraulic pump P, and the transmission case TM have their lower ends at the left and right main frames 1.
It is higher than the lower end position of L · 1R, and the left and right sides are protected by the left and right main frames 1L · 1R. Therefore, contact with weeds, trees, stones, etc. is reduced during work on uneven terrain.

Next, the engine frame 2 mounted on the main frame 1 will be described. Engine frame 2
Connects the left engine frame 2L and the right engine frame 2R which are parallel to each other with a connecting frame portion 2a in the left-right direction at the front end. As shown in FIG. 3 or 4, the lower portion is below the connecting frame portion 2a. The front end connecting frame portion 1 of the main frame 1 is provided with a stopper 11
The positioning protrusion 1f is mounted on the c and also has a front stopper 12 projecting forward from the connecting frame portion 2a and projecting rearward from the front weight supporting frame portion 1e of the main frame 1. Abutting against the
As shown in FIG. 3, a stopper 20 is provided on the stopper bracket 21 so as to project between the anti-vibration support bracket 2d (9) and the anti-vibration support frame portion 1c (anti-vibration support bracket portion 1g) so that the engine frame 2 can be mounted relative to the main frame 1. Regulate the amount of movement. The front end of the engine frame 2 is positioned.

In both side plate portions 2L and 2R, a horizontal support bracket portion 2 is provided behind the connecting frame portion 2a.
b and 2b are projected, and both support bracket portions 2b and 2b
Between 2b, the battery support frame 9 in the front part,
A radiator support frame 10 is laid across the rear part to support the battery B and the radiator R, respectively. Immediately after that, a radiator support frame portion 2c that supports the lower end of the radiator R is laterally installed.

Further rearward thereof, U-shaped anti-vibration support bracket portions 2d, 2d, which are open upward, project from the left and right side plate portions 2L, 2R, and the left and right front frame portions of the main frame 1 therebelow. The anti-vibration rubber 10 is provided between the anti-vibration support frame portion 1c and the anti-vibration support frame portion 1c which are laterally provided between 1a. Then, the anti-vibration support bracket portion 2d-2
On the rear side of d, 2e, 2e, ... Are provided for screwing together with the screw holes formed on the side surface of the lower end of the engine E. Therefore, the engine E is integrally formed with the engine frame 2 by screwing both side surfaces to the left and right side plate portions 2L and 2R of the engine frame 2, and with respect to the main frame 1, the vibration-proof support bracket of the engine frame 2 is attached. The parts 2d and 2d and the vibration isolating support brackets 9 and 9 fixed to the side plate of the engine E are connected to the main frame 1 via the antivibration rubber 10 so as to be vibration isolatingly supported.

The stoppers 11 and 12 at the front end of the engine frame 2 and the stopper bracket portion 20.
Is made of an elastic material such as rubber or resin, and therefore also serves as a vibration-proof support member for the main frame 1 at the front end of the engine frame 2. The engine E and the engine frame 2 integrated with the engine E are vibration-isolated and supported by the anti-vibration rubber 10 on the left and right sides of the main frame 1, but if the anti-vibration support structure is unevenly distributed only at the engine installation location, The anti-vibration rubber 10 is required to have extremely high rigidity, and there is a limit to the anti-vibration property, especially with respect to the vibration in the front-rear direction (for example, the vibration generated when the engine is started or stopped, or when a collision occurs). . If the front end of the engine frame 2 is vibration-isolated and supported by the stoppers 11 and 12 as in this embodiment, the front stopper 12 absorbs the vibration in the front-rear direction, so that the vibration-proof effect is enhanced and the engine is improved. The load applied to the anti-vibration rubber 10 on both sides of E is also dispersed, and the rigidity of the anti-vibration rubber 10 need not be so high, which contributes to cost reduction. In order to integrally support the engine frame 2 and the engine E and peripheral components (battery, radiator, bonnet, etc.) on the main frame 1 in this way, that is, the vibration resistance of the engine E is linked to the periphery thereof. With respect to the parts, the gap between the engine and the engine provided assuming vibration can be reduced, and as a result, the body part of the tractor mounted on the engine frame 2, especially the bonnet 14, can be made compact, and the field of view of the operator can be expanded. It also contributes to.

The vehicle body structure of the tractor will be described with reference to FIGS. 1 and 2. A battery B mounted on and supported by the engine frame 2, a radiator R, and an engine E.
Is covered with the bonnet 14. The width between the left and right engine frames 2L and 2R is shorter than the width between the left and right main frames 1L and 1R, which is necessary to secure the vehicle width of the left and right crawler traveling devices. The left and right width of the bonnet 14 is also short and compact,
The forward visibility from the operator who rides backward is good.

However, when the large crawler traveling device is driven, if the number of cylinders of the engine is increased to cope with the problem, the lateral width does not need to be expanded, but the front-rear length of the engine becomes long. If you use an existing bonnet 14 that fits the left and right width of the engine, the cost will be low, but the front and rear length of the bonnet 14 will be insufficient compared to the front and rear length of the engine. Therefore, an extension cover 15 is extended rearward from the rear end of the bonnet 14, and a partition wall 16 is installed at the rear end of the extension cover 15 so as to separate the engine room from the riding portion behind the rear end. The dashboard 17 provided with the handle 18 and the like is disposed in the vehicle, and the front end of the cabin 19 is connected to both sides and the upper portion of the dashboard 17.

As described above, the frame structure in which the engine frame 2 having a small left-right width is vibration-supported via the vibration-proof rubber 10 on the main frame 1 having a large left-right width in supporting the crawler traveling device, As the vehicle body of the tractor mounted on the upper portion from the hood 14 to the cabin 19, the vehicle body of a compact existing tractor can be used as it is, and a traveling vehicle such as a crawler tractor can be constructed at a significantly low cost.

[0025]

Since the present invention is constructed as described above in the frame structure of the traveling vehicle, the following effects can be obtained. According to the first aspect of the present invention, the lateral distance of the traveling device is long, but the lateral distance of the vehicle body mounted on the traveling device can be shortened to realize compactness and cost reduction. The improvement has the advantage of improving the visibility of the passengers.

Further, by constructing the crawler tractor using the structure of claim 2, the first frame for supporting the crawler traveling device and the second frame for supporting the vehicle body of the tractor are separate bodies. The vehicle body of a traveling vehicle such as a tractor can be compact while ensuring the right-left space of the traveling device, and the existing compact tractor vehicle body can be constructed without the need to construct a large tractor vehicle body adapted to the crawler traveling device. It can be used as it is and can contribute to cost reduction. Furthermore, the compactness of the bonnet etc.
It contributes to improving the visibility of workers.

Further, when the structure according to claim 3 is used, it is possible to separately process the left and right first frames, which are large in size due to the long distance between the left and right, and combine them. Since it is lightweight and only needs to handle the left and right halves of a small space, it is easy to manufacture and contributes to quality preservation.

Further, in the main frame in which the left and right spaces are long, torsional stress is likely to occur and the left and right connecting structures need to have high rigidity. The frame part and the transmission case are members having high rigidity themselves,
By using this as the connecting mechanism for the left and right main frames as it is, it is possible to construct a main frame that is strong against left and right torsional stress at low cost without easily providing a highly rigid connecting mechanism.

[Brief description of drawings]

FIG. 1 is an overall side view of a crawler tractor adopting a frame structure of the present invention.

FIG. 2 is a side view showing the frame structure of the crawler tractor.

FIG. 3 is a plan view of the same.

FIG. 4 is a partial side sectional view showing a mounting structure of front end portions of a main frame 1 and an engine frame 3.

FIG. 5 is a side view showing a portion of a vibration-proof support frame portion 1c of the main frame 1.

[Explanation of Codes] E Engine TM Transmission Case P Hydraulic Pump M Hydraulic Motor 1 Main Frame 1L Left Main Frame 1La Left Crawler Frame 1R Right Main Frame 1Ra Right Crawler Frame 1a Connecting Frame 1b Front Frame 1c Anti-Vibration Support Frame 1d Front end connection frame part 1e Front weight support frame part 1f Positioning protrusion 1g Anti-vibration support bracket part 1h Connection frame part 1i Support bracket part 1j Rear end connection frame part 2 Engine frame 2L Left side plate part 2R Right side plate part 2a Connection frame part 2b Support Bracket part 2c Radiator support frame part 2d Anti-vibration support bracket part 2e Screw hole 3 Crawler 4 Drive wheel 8 Steering gear box 9 Anti-vibration support bracket 10 Anti-vibration rubber 11 Lower part Tsu path 12 the front stopper 13 bolt 14 Bonnet 15 extending cover 16 partition wall 17 front column 19 Cabin

Claims (4)

[Claims] 1. A frame structure for a traveling vehicle, comprising: a first frame supporting a traveling device having a long left-right interval and a second frame supporting a vehicle body having a short left-right interval. 2. A frame structure for a traveling vehicle, comprising a first frame for supporting a crawler traveling device and a second frame for supporting an engine of the traveling vehicle. 3. A frame structure for a traveling vehicle comprising a first frame and a second frame, wherein the first frame is
A frame structure for a traveling vehicle characterized by being configured by combining left and right separate frames. 4. A frame structure for a traveling vehicle comprising a first frame and a second frame, wherein the first frame is
A frame structure for a traveling vehicle, characterized in that the transmission case and a connecting frame part are configured by connecting separate left and right frames.