JPH0219330Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a front column support structure of a cockpit protection device attached to a tractor.

[Conventional technology]

This type of prior art is disclosed in Japanese Utility Model Publication No. 52-44971. In this prior art, as shown in FIG.
and side mounting members 46 fixedly installed on both sides to form a U-shaped mounting bracket 47, and the front strut 12 of the cockpit protection device 11 is attached to and supported by the left and right side mounting members 46 of this mounting bracket 47. is configured to do so.

[Problem that the invention attempts to solve]

In the conventional device, the lower part of the front strut 12 is attached to the upper part of the side attachment member 46, and the space between the left and right struts 12 cannot be made very large, resulting in a small living space. To solve this,
It is possible to protrude the mounting base outward from the side mounting member 46 and attach the front strut 12 to the outer end of the mounting base.
is far away from the clutch housing 3, so when a horizontal or vertical force is applied to the front strut, a moment is also applied to the side mounting member 46, causing the bolt 32 fixing the side mounting member 46 to the clutch housing 3 to This results in a tensile force being applied rather than a shear force. The clutch housing is a cast product that is strong in compression but weak in tension and can be damaged by tensile forces applied to the side fittings. This damage can be prevented to some extent by providing the bottom mounting material 45 and fixing it to the bottom surface of the clutch housing as in the prior art, but the force exerted by the bottom mounting material on the clutch housing is reduced by the force exerted by the side mounting material on the clutch housing. Since the force is in the same direction as the force exerted on the surface, it is difficult to ensure reliable prevention of damage.

[Means to solve the problem]

The present invention solves all of the various problems of the prior art, and the specific structure of the problem-solving means is a pair of left and right front struts 12 and a rear support strut 12 erected from the tractor body 5. The pillars 13 and the top members 14 attached to their upper parts form the cockpit protection device 11, and the lower parts of the left and right front pillars 12 are fixed to the left and right sides of the clutch housing 3 with brackets 30.
In this case, the lower parts of the left and right front struts 12 are attached to the outer ends of mounting bases 21 that protrude outward from each bracket 30, and the lower parts of both brackets 30 are attached to the clutch housing 3.
It is characterized in that it is connected by a connecting member 36 that protrudes downward from the lower surface of the clutch housing 3 and crosses below the clutch housing 3 in order to convert the outward pulling force of one bracket 30 into an inward pushing force of the other. .

[Effect]

Bracket 30 fixed to clutch housing 3
When a lateral or vertical force is applied to the front strut 12, which is provided at the outer end of the mounting base 21 projecting outward from the front strut 12, and the distance between them is increased, a tensile force F1 is applied to one of the brackets 30. , connecting member 3
A pressing force F2 against the clutch housing 3 acts on the other bracket 30 through the bracket 6, and the force F1 acting on the one bracket 30 is also dispersed to the other bracket and becomes a force acting on the clutch housing 3 in the opposite direction. Damage to the clutch housing can be more reliably prevented.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 to 7, reference numeral 1 denotes a forward-reverse type agricultural tractor. A tractor body 5 is formed from an engine 2, a clutch housing 3, a transmission case 4, etc., and a box 7 is arranged behind a bonnet 6 that covers the engine 2. A pair of fenders 8 are attached to the left and right sides of the mission case 4, and a cockpit 9 can be attached and replaced between the left and right fenders 8 and above the box 7. is for a forward-facing control position, and the cockpit 9R above box 7 is for a rearward-facing control position.Although not shown, the handle can also be attached and replaced for both control positions. Reference numeral 10 denotes a front wheel drive propulsion shaft, which extends forward from a gear case 10a provided in the lower abdomen of the transmission case 4.

Reference numeral 11 denotes a protection device that protects the cockpit 9 in both front and rear positions, and in the embodiment, a safety frame is illustrated.
This protection device 11 has a pair of left and right front columns 12, a pair of left and right rear columns 13, and a top member 14 provided at the upper ends of the four columns 12 and 13.

The front support 12 is divided into two parts: a lower front member 16 made of a square tube and an upper front member 17 made of a square lumber. and the lower front member 16
has at least two holes 19 for passing through the bolt 18 on the top and bottom.
It is formed in places.

The front lower member 16 has a lower portion vertically fixed by welding (or bolts) to the outer end of a mounting base 21 which projects outwardly from the clutch housing 3, and is located outward from the left and right steps 22.

A bracket 30 is fixed to the inner end of the mounting base 21 by welding (or bolts). The upper part of this bracket 30 is the clutch housing 3.
It is attached via a bolt 32 to a side mounting seat 31 formed on the outer surface of the clutch housing 3, and its lower part protrudes downward from the lower surface of the clutch housing 3, and the horizontal mounting portion 3
3 and a bolt hole 34 are formed, and a bolt 35 passing through the bolt hole 34 is screwed into a connecting member 36, by which the lower portions of the left and right brackets 30 are connected.

The lower horizontal mounting portion 33 of the bracket 30 can come into contact with the lower mounting seat 37 of the clutch housing 3, and has a recess 33a that fits from the side into a bolt 38 screwed into the lower mounting seat 37. Recess 33
The horizontal mounting portion 33 can be fixed to the clutch housing 3 by tightening the bolt 38 with the bolt 38 fitted into the bolt 38. This horizontal mounting portion 33 is fastened by a bolt 38, and since the recess 33a is fitted into the bolt 38, if the force F1 pulling the bracket 30 outward is large, it will move relative to the clutch housing 3. is possible, and the tensile force F applied to the bracket is
1 is weakened by frictional resistance and transmitted to the other bracket 30 via the connecting member 36, and is converted into a force F2 that presses the other bracket 30 against the clutch housing 3.

The mounting base 21 is formed by bending a plate material into a U-shape, a part of which is lengthened and a horizontal mounting portion 33 is integrally molded, and whether or not the horizontal mounting portion 33 is formed can be determined arbitrarily. can. Note that the mounting base 21 may be formed in a cylindrical shape.

The connecting member 36 may be a plate material, but here a round bar is used, and both end surfaces of the connecting member 36 are connected to the left and right brackets 3.
0 and is spaced apart from the clutch housing 3 and placed across below so as not to interfere with the arrangement of the front wheel drive propulsion shaft 10.

The front upper member 17 has a through hole for a bolt 18 formed only in the lower part, and a receiving member 23 for connecting to the top member 14 is welded to the upper end. The upper front member 17 is bent upward from the midway point into a backwardly inclined position.

The rear support 13 is a lower rear member 26 made of a square tube with a rectangular cross section.
and a rear upper member 27 made of square lumber, the rear upper member 27 is inserted into the rear lower member 26 so as to be freely adjustable in its position in the longitudinal direction, and is connected by bolts 28.
The rear lower member 26 has bolt 28 through holes 29 formed in at least two upper and lower places, and the rear upper member 27 has bolt through holes only in its lower part.
The lower rear member 26 is erected from the upper surface of the fender 8 in a forwardly inclined position, and therefore, when the upper rear member 27 is extended, its position is adjusted upward and forward.

The top member 14 is a frame 39 made of square timbers welded into a rectangular shape.
The left and right sides of this frame 39 are connected to the rear upper member 2.
A receiving member 41 having a U-shaped cross section is fixed to the upper end of the upper front member 17, and its front part is fitted and received by the receiving member 23 of the front upper member 17, and the receiving member 23 is connected by passing through bolts 42 and 43. The bolt 42 that passes through the frame 39
It is possible to pass through two sets of holes on the rear side of the. These two sets of holes are shifted in the front-rear direction, so that the connecting position of the rear upper member 27 with respect to the frame body 39 can be adjusted freely, and when the height of the rear upper member 27 is adjusted, the receiving member 4
This corresponds to the change in the position of 1 back and forth. The hole for the bolt 42 can also be formed as a long hole in the front-rear direction.

The above-mentioned top member may be provided with a canopy for sunshading on the frame body 39, and the canopy is formed by connecting a frame member between the left and right gutter members and stretching a canopy over the frame member, and attaching the frame member to the frame body through a bracket. It is attached to 39.

The protection device 11 is removed from the state shown by the solid line in FIG. 2 by removing the bolts 18, 28, and 42,
7 and 27 upward together with the frame 39, the bolt 28 is passed through the upper through hole 29 of the rear lower member 26 and the lower hole of the rear upper member 27, and the bolt 18 is inserted between the upper part of the front lower member 16 and the front. By passing the bolts 42 through the lower part of the upper member 17 and through the frame body 39 and the receiving member 23, the top member 14 is set at a height necessary for the operator seated in the rear-facing cockpit 9R. be able to.

[Effect of idea]

According to the present invention described in detail above, the front strut 12 of the cockpit protection device 11 is attached to the outer end of the mounting base 21 protruding outward from the bracket 30 fixed to the clutch housing 3. The living space can be expanded by increasing the distance between the pair of front struts 12, and by separating the front struts 12 from the clutch housing 3 in this way, the bracket 30
Even if a moment is applied to the left and right brackets 30, the lower parts of the left and right brackets 30 protrude downward from the lower surface of the clutch housing 3 and are connected by the connecting member 36, so that the outward tensile force exerted by one bracket 30 is absorbed by the other. This can be converted into an inward pressing force of the bracket 30, and by dispersing the force and making the direction of the dispersed force different from the original force, damage to the clutch housing 3 can be more reliably prevented.

[Brief explanation of the drawing]

Figures 1 to 7 show an embodiment of the present invention, with Figure 1 being a front view of the protective device, Figure 2 being a side view, and Figure 3 being a side view of the protective device.
The figure is a rear view, Fig. 4 is a plan view, Fig. 5 is a front view of the main parts of the present invention, Fig. 6 is a side view of the main parts, Fig. 7 is a bottom view of the main parts, and Fig. 8 FIG. 2 is a front view showing a conventional technique. 3...Clutch housing, 11...Protective device, 12...Front strut, 13...Rear strut, 16...
Front lower member, 21... mounting base, 30... bracket, 36... connecting member.

Claims (1)

[Scope of Claim for Utility Model Registration] A cockpit protection device 11 is formed by a pair of left and right front struts 12 and a rear strut 13 erected from the tractor body 5 and a top member 14 attached to the top of these. In the structure in which the lower portions of the front struts 12 are attached to brackets 30 fixed to the left and right side surfaces of the clutch housing 3, each lower portion of the left and right front struts 12 is attached to each bracket 3.
The lower parts of both brackets 30 project downward from the lower surface of the clutch housing 3 to absorb the outward pulling force of one of the brackets 30. A front strut support structure for a cockpit protection device, characterized in that it is connected by a connecting member 36 that crosses below the clutch housing 3 in order to convert it into the other inward pressing force.