JP2003175860A - Tractor frame structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein a conventional tractor cab comprises various parts fitted separately, including members supporting a rear glass, door glasses, and the like, thus resulting in an increased number of component parts. <P>SOLUTION: In this structure, the door glass 50 and the rear glass 51 are supported by a rear pillar 14 constituting the cab, a step side frame 42, a fender 33, and the like. Common use of parts is promoted to reduce the number of parts by utilizing, for example, an outer roof installation stay 35 as a work lamp mounting stay. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for reducing the cost of a traveling vehicle such as an agricultural tractor by reducing the number of parts of a cabin covering a driving part.

[0002]

2. Description of the Related Art Conventionally, a technique related to a cabin structure such as a tractor has been known. For example, Japanese Patent Laid-Open No. 5-1
The technique is described in Japanese Patent Application Laid-Open No. 93529 and Japanese Patent Application Laid-Open No. 6-24249.

[0003]

However, in the conventional cabin, a pipe-shaped steel pipe is bent or welded to form a framework, and a rear glass is provided on the rear surface of the cabin so that it can be opened and closed, and the side surface has a rear glass. A door glass was provided so that it could be opened and closed, and a frame was further attached to the contact surfaces of these rear glass and door glass, so the number of parts was large and the number of assembly steps was also large. Further, in order to support the door glass, a support frame for the door glass was erected on the side surface of the cabin.

[0004]

The problem to be solved by the present invention is as described above, and the means for solving this problem will be described below.

That is, in claim 1, the cabin for covering the driving part of the traveling vehicle is constituted by the side frame unit, the lower frame unit, the upper frame unit, and the outer roof for covering the upper side, and the side frame unit. A rear pillar arranged vertically in the rear part is formed by bending a plate body, and a rear glass and a door glass receiving surface and a weather strip protection surface are provided on the outer surface of the crank-shaped bent portion on the open side of the rear pillar. It is a thing.

In the second aspect, the open side of the rear pillar is covered with a frame cover.

In the third aspect of the present invention, the upper frame unit that constitutes the upper part of the cabin that covers the driving part of the traveling vehicle is composed of the front upper frame, the air conditioner mounting frame, and the rear upper frame, and the outer roof is mounted on both sides of each frame. Part is formed.

According to a fourth aspect of the present invention, a stay is attached to a front surface of the front upper frame at a front outer roof mounting portion of the upper frame unit constituting the upper part of the cabin, and the stay is provided with the outer roof mounting portion and the work lamp mounting portion. It was formed.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described. FIG. 1 is a side view showing the overall construction of a tractor according to an embodiment of the present invention, FIG. 2 is an exploded perspective view showing the structure of a cabin frame, and FIG. 3 is a perspective view showing a cabin frame and an outer roof. 4 is a side view of the cabin frame,
5 is a view showing a lower frame of the cabin, FIG. 6 is an enlarged view showing a portion C of FIG. 5, FIG. 7 is a perspective view of the rear mount stay, FIG. 8 is a rear view of the lower frame, and FIG. 9 is B of FIG. FIG. 10 is a rear view showing a portion, FIG. 10 is a view showing a lower frame of a LOPS specification, FIG. 11 is a side view showing an entire structure of a tractor of a LOPS specification, FIG. 12 is a plan view of a cabin frame, and FIG. 13 is an outer roof. 15 is a partial sectional view showing a mounting stay portion, FIG. 14 is a partial sectional view showing the vicinity of a rear pillar, FIG.
Is a diagram showing a rear pillar and a frame cover, and FIG. 16 is a diagram showing a frame cover.

First, the overall construction of a tractor equipped with a cabin 12 will be described with reference to FIG. Front wheels 2 and 2 are supported on the engine frame 1 via a front axle case, a mission case 6 is arranged on a rear portion of the engine frame 1 via a clutch housing, and a rear axle case is arranged on both sides of the transmission case 6. Rear wheels 3.3 are supported. The work machine can be mounted on the rear part of the mission case 6 through a work machine mounting device including a top link, a lower link, and the like. Further, a front wheel drive output shaft projects forward from a lower front portion of the mission case 6 so that the front wheels 2.2 can be driven via a universal joint, a transmission shaft and the like.

An engine 5 is mounted on the engine frame 1, and the engine 5 is covered with a bonnet 4. A dashboard 11 is arranged at the rear part of the bonnet 4, an operation panel 18 and a steering handle 19 are arranged on the dashboard 11, and a seat 15 is arranged behind the dashboard 11 and the seat 15.
The operating part such as is covered by the cabin 12. A windshield 13 is attached to the front surface of the cabin 12, door glasses 50 and 50 are attached to the side surfaces, and a rear glass 51 is attached to the rear surface. A direction indicator 9 is provided on the lower side surface of the rear pillar 14.

Next, the frame structure of the cabin 12 will be described. As shown in FIGS. 2 and 3, the cabin 12 is composed of side frame units 20, 20, a lower frame unit 21, an upper frame unit 34, and an outer roof 41 covering the upper side, and each unit is arranged first. It is manufactured in advance, and these units are integrally connected and fixed to manufacture a cabin to reduce the cost and improve the assemblability.

As shown in FIGS. 2 and 5, the lower frame unit 21 comprises a down frame 26, a rear center frame 30, a dust cover 29, a front mount stay 27 and a rear mount stay 28.
The pair of left and right down frames 26, 26 are formed in a substantially inverted "F" shape in a side view and extend parallel to the front-rear direction. It is connected and fixed to the side surface of the clutch housing or the transmission case via. The front mount stay 27 has a plate body bent in an L shape in a side view, and has a mounting hole formed in a front portion thereof. The lower end of the air cut plate 39 is fixed between the front ends of the down frames 26 and 26 and extends upward. A step side frame 42 is fixed to the upper surface of the front portion of the down frame 26.

The down frame 26 extends rearward,
A bent portion is formed at a midway portion in the front-rear direction and extends upward to reach the upper surface of the fender 33. A rear mount stay 28 is fixedly installed near the bent portion. In this way, since the down frame 26 is configured to be curved, it is not necessary to form the lower frame of the cabin 12 and the frame of the rear part by separate members for welding, the number of parts and welding are reduced, and the left and right are connected. The rigidity is improved. Further, on the rear center frame 30 at the rear part of the down frame 26, the rear pillar 14 is continuously fixed to the lower portion of the rear pillar 14, and the rear pillar 14 is firmly fixed and supported.

As shown in FIG. 5, FIG. 6 and FIG. 7, the rear mount stay 28 is formed by bending the rear portion of the plate member rearward to form a "H" shape in side view, and at the front portion of the bent horizontal portion. The notch 28c is provided, and the notch 28c has a shape that matches the cross-sectional shape of the down frame 26, and the notch 28c is inserted into the notch 28c. Then, a part of the side plate 28a and the notch 28c of the "he" portion are attached to the down frame 26 by welding or the like. By welding and fixing in this manner, the side surface plate 28a serves as a rib in the bent portion of the down frame 26, and the rigidity can be increased. A rear mount rubber fixing hole 28d is formed at the center of the horizontal portion, and the rear mounting rubber fixing hole 28d is fixed to the rear axle case or the mission case of the machine body through the rear mount rubber by a bolt or the like. ing.

Further, as shown in FIG. 8, a plate-shaped patch 31 is formed on the rear surface of the upper rear end of the down frame 26.
Are fixed by rivets or the like and extended upward, and the rear center frame 30 is mounted on the rear upper ends of the down frames 26, 26, and the rear surface of the rear center frame 30, the patch 31, and the rear center frame 30. The down frame 26 is welded and fixed. In this way, the rear center frame 30 is placed with the patch 31 fixed to the rear end of the down frame 26 and welded from the front and the rear upper sides. Therefore, the rear center frame 30 can be easily welded and the assemblability is improved. Can be improved. If both sides of the rear center frame 30 are of a cabin type, as shown in FIG.
The protrusions 1 of the fender 33 and the rear pillar 14 that make up 0
Fitted between 4g and rear center frame end face 30
a is welded and fixed to the contact plate 46 fixed to the inner surface of the rear pillar 14 shown in FIG. In this way, the rear center frame 30 is suspended and fixed between the rear upper ends of the left and right down frames 26, 26 and the fenders 33, 33.

Further, as shown in FIG. 5, a dust cover 29 is fixedly provided between the middle portions of the down frames 26, 26 and the front surface of the rear portion thereof.
6, the dust cover 29, the rear center frame 30, and the like are connected and fixed to each other to increase rigidity and form the lower frame unit 21. The dust cover 29 is formed by bending a steel plate having a concave notch in the front center part and an opening in the center part in a crank shape in a side view, and opens from the center part of the horizontal part of the down frame 26 to the middle part of the oblique part. The seat seat 15 is disposed above the seat seat lower cover 47 through the L-shaped part having the section. The part bent from the L-shaped part to the upper part is fixed to the hypotenuse part of the down frame 26, so as to be blocked, and dust and the like from below is prevented from entering the cabin. The front notch extends over the transmission case (mission case), and the seat 15 and the seat lower cover 47 are removed above the central opening so that maintenance of the hydraulic case, the hydraulic control valve, etc. can be performed. There is.

Further, as shown in FIG. 10, a lops holder 32 can be attached to both sides of the rear center frame 30. In this case, as shown in FIG.
Instead of the cabin, the safety frame 16 is attached to the lops holder 32 to obtain the lops specification. Unlike the cabin specification machine, such a LOPS specification machine does not have a side frame or the like, so that the rigidity is insufficient, and a lower frame structure stronger than the cabin specification machine is required. The lower frame of the conventional ROPS specification machine had a strong structure different from that of the cabin specification machine. However, the lower frame structure shown in this embodiment becomes a strong structure only by increasing the thickness of the down frame. Therefore, parts other than the down frame, welding jigs, and the like can be shared by the cabin specification machine and the lops specification machine, which can reduce costs and improve work efficiency.

Next, the upper frame unit 34 above the cabin 12 will be described. 3 and 12,
An upper frame unit 34 is fixed to an upper portion between the side frame units 20, 20. The upper frame unit 34 includes a front upper frame 23, an air conditioner mounting frame 25, and a rear upper frame 24. The front upper frame 23 and the rear upper frame 24 are the side frame unit 20.
It is fixed by welding between 20 and the air conditioner mounting frame 25 is fixed by bolts and nuts between the side frame units 20 and 20. A front center frame 22 is suspended and fixed in the horizontal direction in the vertical direction at positions midway up and down of the front pillars 40, 40 arranged in the vertical direction at the front part of the side frame unit 20. Then, the outer roof 41 is attached to the upper frame unit 34. The outer roof 41 is fixed by being fixed to the projecting portion 35a of the outer roof mounting stay 35 welded to the front upper frame 23 with bolts and nuts. Then, it is further fastened with bolts to the outer roof mounting portions 36 arranged on both sides of the air conditioner mounting frame 25 and the rear upper frame 24. Since the outer roof 41 is attached to the upper frame unit 34 in this manner, even if the left and right side frame units 20 are displaced during welding, the dimensions of the attachment position of the upper frame unit 34 do not deviate. It is secured and can be easily fixed. Further, it is not necessary to maintain high welding accuracy and the welding work can be performed easily.

Further, as shown in FIGS. 3 and 13, a sealing member 37 for preventing water infiltration is attached to the upper surface of the front upper frame 23 to secure a seal between the outer roof 41 and the front upper frame 23. The outer roof mounting stays 35 are fixed by projecting forward from the front surfaces on both sides of the front upper frame 23. With this configuration, the mounting position of the outer roof 41 is arranged outside the sealing member 37, water does not enter the cabin from the mounting portion, and it is necessary to provide the sealing member at the mounting position. There is also no. The mounting position of the rear portion of the cabin is also arranged outside the sealing member in the same manner so that the sealing member is not provided in the mounting portion.

The outer roof mounting stay 35 is formed by bending the tip end of the plate body downward, and erecting bolts or the like on the upper surface to form a protruding portion 35a, and attaching the outer roof 41, and by bending the tip end portion downward. The work lamp mounting hole 17 is opened in the
49 (FIG. 1) can be attached with bolts or the like. In this way, the outer roof mounting stay 35 is also used as the work lamp mounting stay, so that the number of parts is reduced and the cost is reduced.

Next, the side frame unit 20 on the side of the cabin will be described. As shown in FIGS. 3 and 4,
The side frame unit 20 on the side of the cabin includes a front pillar 40 standing upright at the front part, a rear pillar 14 standing upright at the rear part, an upper frame 44 connecting between the upper parts of the front pillar 40 and the rear pillar 14, and a step connecting between the lower parts. It is composed of the side frame 42 and the fender 33.

A rear portion of the door glass 50 is pivotally supported by the rear pillar 14 so as to be opened and closed by a hinge or the like. And
A weather strip 45, which will be described later as a sealing member, is attached to the outer periphery of the door glass 50, and the indoor side of the outer periphery is received by the outer surface of the front pillar 40, the step side frame 42, the upper frame 44, the fender 33, the rear pillar 14, and the like. Is configured. Conventionally, the door frame was erected between the front pillar and the rear pillar, so the frame was manufactured in the sub-process and then fixed by welding.Therefore, the number of parts and welding were increased, resulting in cost increase. It was In this embodiment, since the door frame is eliminated to reduce the number of parts and the outer peripheral portion of the door glass is framed by the seal member, the step side frame 4
2. Even if the fender 33 is not provided with a seal member, the door glass is brought into close contact with those members. A sealing member may be provided on the step side frame 42 and the fender 33 side, and the glass side sealing member may be omitted.

The rear glass 51 has its upper end pivotally connected to the rear upper frame 24 via a hinge or the like, and is pivoted rearward and upward to open and close. A weather strip 45 serving as a sealing member is attached to the outer periphery of the rear glass 51,
When closed, this seal member is the rear upper frame 2.
4, the rear pillars 14 and 14 and the rear center frame 30 are closely attached.

The rear pillar 14 is formed in a V shape in a side view, and is formed by bending a plate body. That is, as shown in FIG. 14, in a cross-sectional view, the rear pillar 14 folds the outer side (outdoor side) into a quadrangular shape, folds the inner side into a crank shape to open the end, and the inner side in order from the top of the outer end. In other words, in other words, in order from the first bent portion 14a, which is the central bent portion when it is regarded as one plate, the second bent portions 14b and 14b, the third bent portions 14c and 14c, and the fourth bent portion 14d.
4d, the surface between the first bent portion 14a and the second bent portions 14b, 14b is the outer surface. Then, the second bent portions 14b, 14b located diagonally to the square portion
The outer surface between the inner third bent portions 14c and 14c becomes weather strip protective surfaces 14e and 14e with which the tongue pieces 45b of the weather strip 45 attached to the end surfaces of the door glass 50 and the rear glass 51 come into contact, and the third bent portion is formed. The outer surfaces between the portions 14c and 14c and the fourth bent portions 14d and 14d are glass receiving surfaces 14f and 14f with which the tongue pieces 45c of the weather strip 45 attached to the end surfaces of the door glass 50 and the rear glass 51 come into contact. The weather strip 45 includes a door glass 50 and a rear glass 5.
No. 1 trim portion 45a having a U-shaped cross-section fitted to the outer peripheral portion
And the tongue pieces 45b, 45 protruding from the bottom and side of the U-shape
It is composed of c and.

In this way, the rear pillar 14 not only functions as a frame for supporting the cabin simply by bending, but also supports the door glass 50 and the rear glass 51 on the hinge (hinge) side and the other end. It functions as a receiving part. In the conventional structure, the frames of the rear glass 50 and the door glass 51 are attached to the rear pillar 14 by welding. However, by bending the rear pillar 14 in this manner, these members can be omitted. Therefore, the number of parts can be reduced.

Further, as shown in FIGS. 15 and 16, a resin frame cover 43 having an arc shape or a linear shape in cross section is attached to the open side of the rear pillar 14 of the sheet metal bending structure. The frame cover 43 has fitting portions 4 on both sides.
3a and 43b are formed, and the inner width a of the fitting portions 43a and 43b is configured to be slightly wider than the width b of the rear pillar 14 on the open side. Thus, when the frame cover 43 is attached to the rear pillar 14 from the cabin interior side,
A fitting portion 43a on one side of the frame cover is fitted into one end of the rear pillar 14 on the open side, the frame cover 43 is pushed and bent inside the frame, and an opening 43b on the other side is fitted into the other end side of the frame. The frame cover 43 presses the end portion of the frame by the force of spreading outward, and is fixed to the rear pillar 14 by the elasticity of the frame cover 43 itself. Therefore, it is not necessary to provide a member for fixing the frame cover 43, and the number of parts is reduced. Further, since the frame cover 43 is made of resin, it can be cut, for example, as shown by the line AA in FIG. 16, and can be easily fitted to the shapes of the left and right frames.

[0028]

Since the present invention is constructed as described above,
The following effects are achieved.

That is, as described in claim 1, the cabin for covering the driving part of the traveling vehicle is constituted by the side frame unit, the lower frame unit, the upper frame unit and the outer roof covering the upper side, and the side frame is provided. A rear pillar arranged vertically in the rear part of the unit is formed by bending a plate body, and a rear glass and a door glass receiving surface and a weather strip protection surface are provided on the outer surface of the crank-shaped bent portion on the open side of the rear pillar. Since it is provided, the rear pillar becomes the frame of the rear glass and door glass. That is, the glass frame member can be omitted,
The number of parts will be reduced. Further, it is not necessary to additionally attach a frame for receiving the glass end portion to the pipe-shaped frame, that is, a frame for providing the door glass receiving surface and the weather strip protection surface, and the number of parts can be reduced.

As described in claim 2, since the open side of the rear pillar is covered with the frame cover, it is not necessary to provide a member for fixing the frame cover, the number of parts can be reduced, and the appearance is also improved. Can be improved.

According to a third aspect of the present invention, the upper frame unit that constitutes the upper part of the cabin that covers the driving part of the traveling vehicle comprises a front upper frame, an air conditioner mounting frame, and a rear upper frame, and the outer roof is provided on both sides of each frame. Since the mounting portion is formed, even if the left and right side frame units 20 are displaced in size during welding, the mounting position of the upper frame unit 34 does not deviate, so that the outer roof mounting position is secured and can be easily fixed. Further, it is not necessary to maintain high welding accuracy, and welding work can be performed easily.

According to a fourth aspect of the present invention, at the outer roof mounting portion at the front of the upper frame unit constituting the upper part of the cabin, a stay is mounted on the front surface of the front upper frame, and the stay is mounted on the outer roof and the work lamp mounting portion. Was formed. By also using the outer roof mounting stay 35 as a work lamp mounting stay, the number of parts can be reduced and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing an overall configuration of a tractor according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view showing the structure of a cabin frame.

FIG. 3 is a perspective view showing a cabin frame and an outer roof.

FIG. 4 is a side view of a cabin frame.

FIG. 5 is a diagram showing a lower frame of a cabin.

FIG. 6 is an enlarged view showing a portion C in FIG.

FIG. 7 is a perspective view of a rear mount stay.

FIG. 8 is a rear view of the lower frame.

9 is a rear view showing a portion B of FIG. 2. FIG.

FIG. 10 is a diagram showing a lower frame of LOPS specification.

FIG. 11 is a side view showing the overall configuration of a lobster specification tractor.

FIG. 12 is a plan view of a cabin frame.

FIG. 13 is a partial cross-sectional view showing an outer roof mounting stay portion.

FIG. 14 is a partial cross-sectional view showing the vicinity of a rear pillar.

FIG. 15 is a diagram showing a rear pillar and a frame cover.

FIG. 16 is a view showing a frame cover.

[Explanation of symbols]

14 Rear pillar 20 Side frame unit 21 Lower frame unit 22 Front center frame 23 Front upper frame 24 Rear upper frame 25 Air conditioner mounting frame 26 down frame 28 Rear mount stay 30 rear center frame 33 Fender 34 Upper frame unit 35 Outer roof mounting stay 37 Seal member 40 front pillar 41 outer roof 42 step side frame 43 frame cover 50 door glass 51 Rear glass

Claims (4)

[Claims] 1. A cabin for covering a driving part of a traveling vehicle is constituted by a side frame unit, a lower frame unit, an upper frame unit, and an outer roof covering an upper part, and is vertically arranged at a rear portion of the side frame unit. A rear pillar to be arranged is formed by bending a plate body, and a rear glass and a door glass receiving surface and a weather strip protection surface are provided on an outer surface of a crank-shaped bent portion on the open side of the rear pillar. Tractor frame structure. 2. The tractor frame structure according to claim 1, wherein the open side of the rear pillar is covered with a frame cover. 3. An upper frame unit constituting an upper part of a cabin for covering a driving part of a traveling vehicle is constituted by a front upper frame, an air conditioner mounting frame and a rear upper frame, and outer roof mounting portions are formed on both sides of each frame. The frame structure of the tractor characterized in that. 4. A stay is attached to a front surface of a front upper frame in a front outer roof mounting portion of an upper frame unit constituting the upper part of the cabin, and an outer roof mounting portion and a work lamp mounting portion are formed on the stay. The frame structure of the tractor according to claim 3, which is characterized in that.