JPH10218020A - Tractor guard frame support structure - Google Patents

Abstract

(57) [Problem] To provide a rope support frame having sufficient strength in both the left-right direction and the front-rear direction by devising attachment of the support frame to the body. SOLUTION: A pair of left and right support frames 12, 12 having a ropes support portion on an upper portion are attached to a rear portion of a transmission case, and an auxiliary frame 17 supported by an airframe is extended forward on each of the support frames 12, 12. Attach and attach the front parts of the left and right auxiliary frames 17
A gate-type standing frame 20 having a steering tilt portion, a fuel tank hanging portion, and the like are connected to each other to form a riding portion frame that also serves as a ropes support that is vibration-proof and supported.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for supporting a guard frame of a tractor, and more particularly to a rationalization of simplification of a structure of a connection portion with a transmission case by dispersing a force, while enabling sufficient strength to be supported. It is about technology.

[0002]

2. Description of the Related Art As a support structure for a guard frame in a tractor, one disclosed in Japanese Patent Application Laid-Open No. 8-238999 is known. That is, a pair of left and right support frames (reference numeral 8) each having a guard frame mounting portion are provided in the rear wheel fender portion, and the lower portions of the frames are attached to side portions of the rear portion of the transmission case. The reinforcing connection was made by an intermediate reinforcing plate bolted to the cylinder case.

[0003]

That is, in the above-mentioned prior art, the connection strength with the transmission case and the connection strength between the support frames are increased by using a reinforcing plate instead of simply connecting the lower portion of the support frame. In order to reinforce it, it has been devised to provide sufficient strength. In other words, the support frame and the transmission case are connected at the lower part of the rear part of the case at two places spaced apart on the left and right and at the upper part of the left and right central part, and are connected to the entire length of the support frame when viewed in the front-rear direction. The span between the parts is relatively wide, and the support strength in the left-right direction is easily ensured.

However, when viewed in the left-right direction, since the vertical span between the connecting portions with respect to the entire length of the support frame is relatively short, there is a problem that it is difficult to secure the support strength in the front-rear direction. Therefore, in order to cope with high stress in the case mounting portion when an excessive front-rear force acts on the guard frame, a mounting plate having a large contact area using a large number of bolts is used. It was complicated and required installation time.

An object of the present invention is to provide a guard frame support structure having sufficient strength in the left-right direction and the front-rear direction by devising the mounting of the support frame to the body.

[0006]

[Means for Solving the Problems]

[Structure] In the first invention, a pair of left and right support frames each having a guard frame mounting portion on an upper portion are attached to a rear portion of a transmission case, and an auxiliary frame supported by the fuselage is extended to each of the two support frames. It is characterized in that the left and right auxiliary frames are connected to each other while being attached.

A second invention is characterized in that, in the first invention, each of the two support frames and both the auxiliary frames are supported in a vibration-proof manner.

According to a third aspect of the present invention, in the second aspect, a mechanical stopper for restricting a displacement amount of the support frame with respect to the transmission case to a predetermined amount or less is provided on the anti-vibration support portion for both support frames. .

A fourth invention is characterized in that, in the first to third inventions, a sheet metal rear wheel fender is erected and connected across the support frame and the auxiliary frame.

According to a fifth aspect of the present invention, in the first to fourth aspects, a connecting member for connecting the front portions of the left and right auxiliary frames is provided, and the connecting member is formed in an upright state in which the connecting member has a portal shape when viewed in the front-back direction. It is characterized by the following.

A sixth invention is characterized in that, in the fifth invention, a mounting stay for supporting the steering shaft is supported at the left and right central portions of the connecting member.

In the structure of the first aspect, since the auxiliary frame is attached to the support frame so as to extend forward from the support frame, and the auxiliary frame is supported by the body, the transmission case at the lower portion of the support frame is provided. The front and rear span between the mounting portion to the support frame and the body supporting portion of the auxiliary frame can be made wide easily, and the supporting strength of the supporting frame in the front and rear direction can be secured to 10 parts. Moreover, since the left and right auxiliary frames are connected,
The rigidity of the auxiliary frame is increased, and as a result, the relative torsional rigidity of the left and right support frames is also improved.

According to the second aspect of the present invention, since both of the supporting frame and the both auxiliary frames are supported by vibration isolation, the guard frame resonates due to engine vibration and emits noise while sufficiently supporting the supporting frame. Will be eliminated or reduced. In the case where the riding section is mounted on these frames, the riding section is supported on the body by vibration isolation, vibration is reduced, and the riding feeling is improved.

According to the third aspect of the present invention, since the swinging movement due to the vibration proof support is limited, the stopper is brought into contact with the body side to receive the excessive input so that the stopper can be firmly received and supported. In addition, an effective vibration damping action can be exerted against vibration at a normal level. And since the stopper is a mechanical type, for example, a cylindrical member and a pin located inside the cylindrical member are arranged separately on the machine body side and the support frame side so that the stopper can be configured with a simple and inexpensive one. Become.

According to the fourth aspect of the present invention, since the supporting frame and the auxiliary frame are connected by the sheet metal fender having strength itself, the supporting strength of the supporting frame is effectively utilized by effectively utilizing the existing existing parts. It is possible to further improve.

According to the fifth aspect of the present invention, the member for connecting the front portions of the auxiliary frames can correspond to the front portion of the operating portion when viewed from the position, so that the connecting member stands up like a gate. By doing so, it becomes possible to utilize it as a frame such as a front panel on which instruments and the like are arranged and a handle support portion.

According to the configuration of claim 6, it is possible to support the mounting stay for supporting the steering shaft by using the portal-shaped upright connecting member which is a strength member.
In other words, a dedicated frame for supporting the steering shaft can be omitted by utilizing the connection structure of the left and right auxiliary frames.

[Effect] In the guard frame supporting structure according to any one of the first to sixth aspects, by adding the left and right auxiliary frames that are relatively connected to each other, the supporting strength and the relative torsion of the supporting frame in the front-rear direction are provided. Reinforce rigidity,
Excellent support strength was obtained.

In the guard frame support structure according to the second aspect, while supporting the guard frame with sufficient strength, the resonance phenomenon that causes noise can be reduced or eliminated, and the riding feeling can be improved.

In the guard frame supporting structure according to the third aspect, while employing the vibration isolating support structure of the guard frame which contributes to the improvement of the ride feeling, the inexpensive mechanical stopper substantially reduces the vibration of the vibration isolating supporting portion by elastic deformation. It was possible to achieve a reasonable one with almost no significant decrease in support strength.

In the guard frame support structure according to the fourth aspect, the rear wheel fender, which is an existing component, can be used also as a reinforcing member, and the support strength of the guard frame can be rationally improved.

In the guard frame support structure according to the fifth aspect, the member connecting the front portions of the auxiliary frames can not only improve the strength but also serve as a frame for supporting the components of the driving section such as the front panel and the handle support. Now you can take advantage of it.

In the guard frame supporting structure according to the sixth aspect, the exclusive structure for supporting the steering shaft can be omitted by using the connecting structure of the left and right auxiliary frames, thereby making the structure economical.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a tractor, 1 is a front steerable wheel, 2 is a rear drive wheel, 3 is an engine,
Is a front axle frame, M is a transmission case, 5 is a driving section, 6 is a ropes (guard frame), 7 is a lifting link mechanism, and 8 is a rear wheel fender. Mission case M
Has a rear axle case 9, 9 at the rear, and is also a body frame combined type having a front end directly connected to the engine 3. In order to reduce the height of the step floor 10, a case middle is provided. The upper surface is configured to be lower than the upper surface of the front part of the case directly connected to the engine.

Next, the support frame structure of the rope 6 will be described.

As shown in FIGS. 2 to 5, the portal-type lops 6 is supported on the upper part of the pair of left and right support frames 12, 12 so as to be able to swing around the horizontal fulcrum P. The posture can be freely switched between a posture and a storage posture which is tilted backward. The support plate 13 fixed to the lower end of the support frame 12 and the mounting plate 14 bolted to the rear axle case 9 on the left and right of the transmission case M are connected to the vibration isolating rubber 15.
And left and right support frames 1
The upper portions of the two 2 and 12 are connected by an upper connecting bar 16.

Auxiliary frames 17 extending forward on both sides of the transmission case M are bolted to the downwardly bent portions 13a of the front ends of the support plates 13, and are attached to the front portions of the left and right auxiliary frames 17,17. A step frame 18 made of a left-right channel material connecting these components is fixed, and front end frames 19, 19 each having a substantially L-shape in side view are fixed to the left and right of the step frame 18.

The front end frame 19 comprises a horizontal portion 19A fixed to the step frame 18 and a vertical portion 19B for connecting an upright frame 20, which will be described later, with bolts.
The horizontal portion 19 </ b> A is mounted and connected via a vibration-proof rubber 15 to a support plate 21 bolted to the side of the transmission case M. The left and right vertical portions 19B, 19B are bolt-connected to an upright frame (an example of a connecting member according to claim 5) made of a sheet metal, which has a gate shape when viewed in the front-rear direction. A handle support (an example of a mounting stay in claim 1) 22 made of a pipe material is erected by bolt connection between the left and right central portions of the step frame 18 and the left and right central portions of the step frame 18 described above.

As shown in FIGS. 4 and 6, a portal frame 23 having a portal shape similar to that of the upright frame 20 on the vibration isolation system side is bolt-connected to the left and right side surfaces of the transmission case M. . A pair of mounting stays 23a extending from the erection stays 23A connecting the lower portions of the pipe frames 23 are also bolted to the flange portion of the transmission case M, and the mounting brackets 23b are fixed to the left and right upper portions of the pipe frame 23. It is.

The bottom of the fuel tank 24 is placed on the erection stay 23A, and the upper part of the welding flange 24a and the mounting bracket 23b are connected by bolts. It is connected by bolts. In other words, the fuel tank 24 is in a state in which the vibration damping function is exhibited by the presence of the cushion rubber 41 while being securely suspended and fixed to the fixed system, and the support strength of the upright frame 20 is reinforced by the pipe frame 23. It is.

An attachment stay 27 for supporting a steering shaft 26 is supported on a support bracket 25 fixed to an upper portion of the handle support 22 through a vibration-proof rubber 28 in a vibration-proof manner. That is, the bearing member 30 supporting the upper shaft 26a provided with the steering handle 29 is pivotally supported on the mounting stay 27 so as to be tiltable at the lateral fulcrum Z, and the tilt engagement portion 27a is provided on the left pivot plate 27A at the upper portion. It is formed. The step frame 18 to which the lower end of the handle support 22 is connected has a shape in which the left and right central portions are raised upward in order to avoid interference with the transmission case M.

On the other hand, as shown in FIGS. 2, 3, and 5, lower portions of the left and right support frames 12,
A rear connecting fender 8 made of sheet metal is bolted to the lower connecting bar 31 via a. A rear wheel fender 8 is also bolted to a stay 17a fixed to an intermediate portion in the front-rear direction of the auxiliary frame 17, and the rear wheel fender 8 bridges and connects the support frame 12 and the auxiliary frame 17. It has become.

As shown in FIG. 3, a square member 33 whose upper surface is close to the lower surface of the support plate 13 is mounted on the upper surface of the front portion of the mounting plate 14. In other words, the square members 33 are provided on the vibration isolating supports for both the support frames 12 as mechanical stoppers for regulating the vertical and horizontal displacements of the support frame 12 with respect to the transmission case M to a predetermined amount or less.

As shown in FIG. 7, each support plate 1
3 side bent portion 13b facing outward in the left-right direction
Are formed in a state where the inner surface thereof is located near the outer end 14 a of the mounting plate 14, and these side bent portions 13 are formed.
The movement in the left-right direction may be restricted by the contact between b and the outer end 14a.

Next, the structure for attaching the drop 6 to the support frame 12 will be described. As shown in FIGS. 8 and 9, the rocking body 6A fixed to the lower end of the rope 6 is
An operation lever 36 is pivotally supported at a lateral fulcrum P in a rearward U-shaped stay 34 bolted to the upper end, and is rotatable about a front and rear fulcrum X on a support block 35 fixed inside the stay 34. I have been supported.

Operation lever 3 formed by bending a bar into an L shape
A stopper block 37 is fixed to the straight portion 6 and a winding spring 39 is interposed on the front side of the support block 35 via a snap ring 40 and a washer 38. Right and left width of stopper block 37 is just stay 3
4 is set to a size that fits just inside the left and right width. A hole 34h for inserting a washer 38 is formed in a front wall 34a of the stay 34.

That is, FIG. 8 shows a state in which the operation lever 36 is turned upward and the stopper block 37 is fitted into the stay 34.
In the state (a), the first receiving surface 6a of the rocking body 6A comes into contact with the stopper block 37, and the stopper block 37 and the support member 42 come into contact with each other, thereby maintaining the upright working posture of the ropes 6. ing. At this time, the winding spring 3
Numeral 9 urges the support block 35 and the washer 38 in a direction away from each other, and maintains the operation lever 36 in a standing state by itself.

Then, the operating lever 36 is pulled out and moved backward against the urging force of the winding spring 39,
When the turning operation is performed, the stopper block 37 comes into contact with the front surface of the support member 42 and stops as shown in FIG.
In this state, the stopper block 37 and the first receiving surface 6a
Interference with the robot is avoided, and the ropes 6 can be tilted backward and moved. When the drop 6 is moved down, the protruding second receiving surface 6b of the rocking body 6A comes into contact with the upper surface of the support block 35 and stops, and the storage posture of the rope 6 appears.

The operation lever 36 is supported only by the support block 35 so as to be able to move out and retreat and to be rotatable, and is urged forward by a winding spring 39. Therefore, in the normal operation posture in which the ropes 6 are raised, the stay front wall hole 34h and the washer 3 are substantially in the same plane position, and as in the prior art (Japanese Patent Application No. 8-184736 previously filed), The appearance is improved as compared with a configuration in which the operation lever linear portion projects greatly forward from the stay. Therefore, it is not necessary to provide a cover, and the cost can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is a side view of a tractor.

FIG. 2 is a rear view showing the support structure of the ropes.

FIG. 3 is a side view showing a support structure for a rope.

FIG. 4 is a side view showing a support structure for a fuel tank and a steering shaft.

FIG. 5 is an overall perspective view showing a support frame structure of the driving unit.

FIG. 6 is a perspective view showing a relationship between an upright frame and a pipe frame.

FIG. 7 is a rear view showing another anti-vibration support structure of the ropes support portion.

FIG. 8A is a side view showing the structure of the rope support in a standing operating position, and FIG.

FIG. 9 is a rear view of the lops support portion.

[Explanation of symbols]

 Reference Signs List 6 guard frame 8 rear wheel fender 12 support frame 17 auxiliary frame 20 connecting member 25 mounting stay 26 steering shaft 33 mechanical stopper M transmission case

Claims (6)

[Claims] 1. A pair of left and right support frames provided with a guard frame mounting portion on an upper portion are attached to a rear portion of a transmission case, and an auxiliary frame supported by an airframe is attached to each of the two support frames so as to extend forward.
The guard frame support structure of the tractor that connects these left and right auxiliary frames. 2. The guard frame support structure for a tractor according to claim 1, wherein each of the two support frames and the two auxiliary frames are supported in a vibration-proof manner. 3. The guard frame for a tractor according to claim 2, wherein a mechanical stopper for restricting a displacement amount of the support frame with respect to the transmission case to a predetermined amount or less is provided on the vibration isolating support portion for the both support frames. Support structure. 4. The guard frame support structure for a tractor according to claim 1, wherein a rear wheel fender made of sheet metal is bridged and connected between the support frame and the auxiliary frame. 5. A connecting member for connecting the front portions of the left and right auxiliary frames to each other, and the connecting member is configured to be in an upright state having a gate shape when viewed in the front-rear direction.
A tractor guard frame support structure according to any one of the preceding claims. 6. A guard frame support structure for a tractor according to claim 5, wherein a mounting stay for supporting a steering shaft is supported at the left and right central portions of said connecting member.