JP2004074895A - Front frame structure of tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a front frame part structure of a tractor for securing rigidity of a power steering cylinder unit installing part without requiring a special reinforcing member, and optimizing exhaust of engine exhaust gas while securing a longitudinal balance of a machine body. <P>SOLUTION: This front frame part structure of the tractor has front frames 2 and 3 for an axle bracket formed in an almost U shape and a power steering cylinder unit 4. Weight installing parts 12a and 12b are respectively formed on left-right side plates 2 and 2 and a bumper 3 of a front frame, and an integrally constituted weight 5 for the longitudinal balance is installed on the three members of the front frame via these weight installing parts 12a and 12b. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a front frame structure of a tractor, and in particular, to ensure the rigidity of a power steering cylinder unit mounting portion without requiring a special reinforcing member, and to maintain a balance between the front and rear of an airframe while ensuring proper emission of engine exhaust gas. The present invention relates to a front frame structure of a tractor capable of realizing.
[0002]
[Prior art]
2. Description of the Related Art A tractor front frame structure having a front axle bracket at the front of an engine is known. The front frame is formed in a substantially U-shape by three members including left and right side plates extending forward from both sides of the engine and a bumper at a front end thereof. Between the left and right side plates, a power steering cylinder unit and a weight for front-rear balance of the body are attached. Further, an exhaust pipe for discharging engine exhaust gas from the side of the front frame toward the front is provided.
[0003]
[Problems to be solved by the invention]
However, in the front frame structure of the tractor, since the power steering cylinder unit that assists the steering force of the front wheels receives a large torsional moment, the front frame is formed in a substantially U-shape by three members, and the rigidity of the front frame is insufficient. there were. In addition, when a large front weight extending to the outside of the bumper is attached to the front side of the bumper, the front-rear balance can be effectively secured, while the front pipe extends from the exhaust pipe provided through the front weight to the front. The discharged exhaust gas returns to the radiator, causing a problem in the cooling function.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a tractor capable of securing the rigidity of a power steering cylinder unit mounting portion without requiring a special reinforcing member, and achieving proper emission of engine exhaust gas while maintaining a balance between the front and rear of the aircraft. It is to provide a front frame part structure.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, an invention according to claim 1 is an axle bracket formed in a substantially U-shape by three members including left and right side plates extending forward from both sides of an engine and a bumper at a front end thereof. In the front frame structure of a tractor including a front frame for use and a power steering cylinder unit provided between left and right side plates of the front frame, weight mounting portions are formed on the left and right side plates and the bumper of the front frame, respectively. An integrated weight for front-rear balance is attached to the three members of the front frame via these weight attachment portions.
[0006]
A power steering cylinder unit is provided between the left and right side plates at the power steering cylinder unit mounting portion of the front frame to steer the front wheels. At this time, since the U-shaped front frame is configured to hold a highly rigid integrated weight via the three weight mounting portions, the rigidity of the front frame is secured by the integrated weight.
[0007]
The invention according to claim 2 is to raise an internal stay that connects the left and right side plates at a substantially middle position in the front-rear direction of the front frame, and to hook and support a rear end of the integrated weight on an upper end of the internal stay. A hooking support portion is formed.
[0008]
In the above-described front frame portion structure, the integral weight can be attached to the front frame by the bumper and the internal stay.
[0009]
According to a third aspect of the invention, there is provided a front frame for an axle bracket formed in a substantially U-shape by three members including left and right side plates extending forward from both sides of an engine and a bumper at a front end thereof. In the front frame structure of the tractor having an exhaust pipe for discharging engine exhaust gas from the outside of the frame toward the front, a front weight for fuselage balance is attached to a front surface of the bumper, and the front weight has both ends. The portion extends in the vehicle width direction to the outside of the bumper of the front frame, and a guide groove is formed in a portion facing the opening of the exhaust pipe to receive engine exhaust gas and guide it to the open atmosphere side.
[0010]
Both ends of the front weight protrude in the vehicle width direction to the outside of the front frame bumper to secure a large capacity, and a maximum distance from the center of gravity is secured at the front position of the front frame bumper. Therefore, a large moment is secured. At this time, the engine exhaust gas discharged from the exhaust pipe is guided in a predetermined direction along the guide groove of the front weight.
[0011]
【The invention's effect】
The front frame structure of the tractor of the present invention has the following effects.
In the front frame structure of the tractor having the above-described structure, rigidity of the front frame is secured by attaching an integrated weight for front-rear balance to three members of the front frame. Therefore, the rigidity of the power steering cylinder unit mounting portion against the torsion of the axle bracket of the front frame can be secured without requiring a special reinforcing member.
[0012]
If the front frame is formed with a hook support at the rear end of the weight, even if the integrated weight cannot be attached to the left and right side plates when attached to the front frame, the hook support for the bumper weight attachment section and the internal stay By means of the parts, the integral weight can be stably mounted in the front frame.
[0013]
In addition, for those in which a guide groove is formed in the front weight on the front of the bumper to discharge engine exhaust gas in a predetermined direction, the engine exhaust gas is appropriately returned without returning to the radiator while effectively securing a large moment. Discharge is possible.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment specifically configured based on the above technical idea will be described below with reference to the drawings.
The front frame structure of the tractor according to the present invention will be described. FIG. 1 is a plan view of the front frame portion of the tractor according to the present invention, which is partially broken, FIG. 2 is a view taken in the direction of the arrow A in FIG. 1, and FIG.
[0015]
1 to 3, the front frame 1 of the tractor is substantially formed by three members including left and right side plates 2, 2 extending forward from both sides of an engine (not shown) and a bumper 3 for fixing the front end thereof. A front frame for an axle bracket is formed in a U-shape, and the power steering cylinder unit 4, the weight 5, and the like are attached to the front frame.
[0016]
Power steering cylinder unit mounting portions 11a and 11b are formed on the left and right side plates 2 and 2 of the front frame, and the power steering cylinder unit 4 is mounted with bolts and the like via the power steering cylinder unit mounting portions 11a and 11b. Weight attachment portions 12a and 12b are formed on the left and right side plates 2 and 2, and weight attachment portions 14 and 14 are also formed on the bumper 3, and weights 5 for front-rear balance formed integrally by casting or the like. Are attached to the left and right side plates 2 and 2, and the front end of the weight 5 is attached to the bumper 3 with bolts or the like.
[0017]
In addition, an internal stay 15 is provided between the left and right side plates 2 at an intermediate position in the front-rear direction of the front frame, and a bent portion at an upper end thereof is formed as a hook support portion 15a. The hook support 15a hooks and supports the rear end 5a when the weight 5 is attached to the front frame. Even if the weight 5 cannot be attached to the left and right side plates, the hook supporting portion 15a forms an integral weight in the front frame by the weight attaching portions 14, 14 of the bumper 3 and the hook supporting portion 15a of the internal stay 15. Can be installed stably.
[0018]
By configuring the front frame portion 1 of the tractor as described above, the power steering cylinder unit 4 is disposed on the power steering cylinder unit mounting portions 11a and 11b of the front frame so as to bridge between the left and right side plates 2 and 2. The front wheels are steered by the rotation of a steering arm 16 projecting below the power steering cylinder unit 4 in accordance with the rotation of the input rod 4a on the side of the side plate 2. At this time, since the weight 5 having a large rigidity is integrally mounted via the weight mounting portions 12a and 12b so as to be fitted into a portion surrounded by the three members 2 and 3 of the U-shaped front frame. The weight 5 ensures the rigidity of the front frame. Accordingly, the rigidity of the power steering cylinder unit mounting portions 11a and 11b against the torsion of the axle bracket of the front frame can be ensured without requiring any special reinforcing member.
[0019]
Next, another configuration of the front frame portion of the tractor will be described. FIG. 4 is a side view showing another configuration of the front frame portion of the tractor, and FIG. 5 is a single perspective view of the weight. In the following, description of the same members will be omitted by giving the same reference numerals.
4 and 5, a front frame formed by left and right side plates 2 and 2 and a bumper 3 at the front end of the front frame 21 is formed on the front frame portion 21, and weight mounting portions 14 and 14 formed on the bumper 3 are formed. A front weight 22 for body balance is mounted on the front side with bolts or the like. Further, an exhaust pipe 23 for discharging engine exhaust gas is disposed forwardly on the outer side of the side plate 2 of the front frame.
[0020]
The front weight 22 is provided at its rear side with bolt holes 14a for attaching to the bumper 3. Both end portions 22a, 22a are formed so as to protrude outward of the bumper 3 in the vehicle width direction. A guide groove 24 is formed at a portion facing the opening so as to receive the engine exhaust gas and guide the exhaust gas toward the open air side, and the guide groove 24 extends outward and downward of the fuselage.
[0021]
By configuring the front frame portion 21 of the tractor as described above, a large capacity of the front weight 22 is secured by the side end portions 22a, 22a projecting in the vehicle width direction to the outside of the bumper 3 of the front frame, and Since the distance from the center of gravity of the machine is secured at the front position of the bumper 3, a large balance moment is secured. At this time, the engine exhaust gas discharged from the exhaust pipe 23 is guided to the lower outside of the body along the guide groove 24 of the front weight 22.
Therefore, by the front frame structure of the tractor, a large moment can be effectively secured, and the exhaust gas to the engine 25 can be prevented from being recirculated to the radiator 25 by optimizing the exhaust gas from the engine.
[0022]
Next, a description will be given of the mounting portion of the tractor with the two-posts ropes. FIG. 6 shows a rear side view of the tractor, and FIG. 7 shows an enlarged side view of a mounting portion of the two-post rope. In FIG. 6 and FIG. 7, a two-post rope 31 is formed upright in the vicinity of an operator seat 32 to protect the operator in the event of an overturn of the body, etc., and supports a support member 33, 33 connected to the lower left and right sides of the rear axle. It is configured by being attached to brackets 35, 35 provided on the boxes 34, 34 with bolts or the like. The support members 33, 33 are configured to be able to swing within the tilt angle range of two positions of the standard position 31 and the retreat position 31a.
[0023]
More specifically, a plurality of mounting holes are formed in the mounting portions of the left and right support members 33, 33 of the two-column lops 31 in correspondence with the inclination of the standard position, and the retreating position is limited to the inclination position around one of the mounting holes 33a. By forming a stopper 35a for restricting the inclination of the support member 33, the support member 33 is configured to be swingable in an angular range from a standard position to a retracted position. The standard position 31 is an original position of the two-posts 31 with respect to the operator seat 32, and the retracted position 31a is a position retracted to a range where there is no interference when the left and right rear fenders 37, 37 are attached.
[0024]
By configuring the mounting portion of the two-post ropes as described above, the left and right rear fenders 37, 37 integral with the floor can be assembled to the body after the two-post ropes 31 are mounted. That is, after attaching the two-posts ropes 31 to the brackets 35, 35 at the retreat position 31a with bolts or the like, the left and right rear fenders 37, 37 integrated with the floor are assembled to the body. At this time, since the two-pillar lops are at the retracted position 31a, the left and right rear fenders 37, 37 integrated with the floor can be assembled to the fuselage. After that, the two-column rope 31 is tilted to the standard position and bolted together with other mounting holes at the original position. Therefore, since the rotation supporting portion of the upper frame and the upper frame do not become an obstacle, it is possible to mount the floor and fender integrated structure without changing the assembly procedure on the line.
[0025]
Next, a description will be given of a two-pillar lops capable of supporting multiple models. FIG. 8 is a side view of a two-pole rope that can be used for various types, and FIG. 9 is an enlarged side view of a main part thereof. In FIGS. 8 and 9, the two-pillar lops includes an upper frame 42, a support member 43, and the like. Between the upper frame 42 and the supporting member 43, two types of adjusting members 44a and 44b are provided so that the inclination angle between the two can be selected. The support member 43 forms a bolt hole so that two types of inclination angles can be selected with respect to the bracket 35 provided on the rear axle box 34.
[0026]
By configuring the two-posted rope as described above, the inclination angle between the upper frame 42 and the support member 43 and the corresponding inclination angle of the support member 43 are selected to change the position of the upper frame 42 with respect to the operator seat 32. can do. Therefore, with respect to models having different wheelbase dimensions, the positional relationship between the upper frame 42 and the operator seat 32 can be made constant by selecting the manner of assembling the two-pillar lops.
[0027]
In this manner, by forming the two-posted rope so that the inclination angle between the upper frame 42 and the support member 43 and the inclination angle of the support member 43 can be changed, each of the two column ropes is individually adapted to models having different wheelbase dimensions. There is no need to prepare a pillar drop, and management locations and erroneous assembly can be eliminated.
[0028]
Next, the configuration of the rear mount portion of the floor will be described. FIG. 10 shows a side view of the rear mount portion of the floor. In FIG. 10, the rear mount portion of the floor 51 is constituted by functionally-specific members such as a stabilizer fulcrum bracket 53 and a floor mount mounting frame 54. The stabilizer fulcrum bracket 53 has a stabilizer fulcrum 56 projecting rearward from the rear axle box 55, and is bolted to the rear axle box 55 together with the floor mount mounting frame 54. The rear part of the floor 51 is fixed via the floor mount mounting frame 54. Further, the lower end of the ropes 57 is fixed to the stabilizer fulcrum bracket 53 by bolts.
[0029]
By configuring the rear mount part of the floor as described above, conventionally, the mounting plate is integrated with the ropes and the mounting plate is a separate component, which is costly. When the ropes are bent, the entire floor moves, causing the operator space to be compromised.In addition, since the stabilizer fulcrum bracket and the ropes are integrated, the load on the rear working machine affects the ropes. However, such a problem can be solved.
[0030]
Next, the lower link stabilizer will be described. FIG. 11 shows a plan view (a) and a front view (b) of the lower link stabilizer. In FIG. 11, the lower link stabilizer 61 is composed of an outer cylindrical member 62 such as a square pipe and the like, and an inner member 63 slidably inserted into a hollow portion thereof. Holes 65 and 66 for inserting a pin 64 for determining a relative position between the outer cylinder member 62 and the inner member 63 are formed at predetermined slide positions. In addition, a support shaft 67 is provided below and adjacent to the outer cylinder member 62, and the support shaft 67 supports a lever 68 so as to be able to swing in the longitudinal direction of the inner member 63, and the lever 68 moves the inner member 63 forward and backward. It is inserted through the hole 63a as needed. The support shaft 67 is held by a connecting pin 67a at the end of the outer cylinder member 62 or the like.
[0031]
As shown in the plan view of the lower link portion in FIG. 12, the lower link stabilizer 61 having the above-described configuration connects the lower link stabilizer 61 to an intermediate portion between the left and right lower links 71, 71, and swings the lever 68. By adjusting the length of the lower link stabilizer 61 while moving the inner member 63 forward and backward by operation, the pin 64 can be inserted and fixed after appropriately adjusting the lower link tension. At this time, the inner member 63 can be moved forward and backward by a slight one-hand operation force, and the pin 64 can be inserted and operated by the other hand.
[0032]
Therefore, in the past, it was necessary to perform a difficult operation of inserting the pins without loosening while lowering the stabilizer for the lower link using both hands.However, while the rear working machine was connected by the stabilizer for the lower link, the left and right The tension of the lower links 71, 71 can be easily adjusted.
[0033]
Next, a lower link stabilizer having another configuration will be described. FIG. 13 shows a plan view (a) and a front view (b) of a lower link stabilizer having another configuration. In FIG. 13, the outer cylindrical member 62 of the lower link stabilizer 81 is rotatably erected on the connecting pin at the end thereof as a support shaft 82, and swings in the longitudinal direction of the inner member 63 via the support shaft 82. A lever 83 is provided so as to be movable. In addition, a stud member 84 capable of sliding the inner member 63 within a predetermined range is set up near the lever 83, and the base of the lever 83 and the stud member 84 are connected by a chain-like connecting member 85. A flange 83 a is formed at the base of the lever 83 as a means for positioning the connecting member 85.
[0034]
The lower link stabilizer 81 having the above configuration can be operated in the same manner as described above by swinging the lever 83 in a horizontal plane.
[Brief description of the drawings]
FIG. 1 is a plan view of a front frame structure of a tractor according to the present invention, which is partially broken. FIG. 2 is a view taken in the direction of an arrow A in FIG. 1 FIG. FIG. 5 is a perspective view of a single unit of the weight of FIG. 4; FIG. 6 is a rear side view of the tractor; FIG. 7 is an enlarged side view of a mounting portion of the two-pole lops of FIG. 6; FIG. FIG. 9 is a side view of a main pillar of the two-pole lops of FIG. 8; FIG. 10 is a side view of a rear mount portion of the floor; FIG. 11 is a plan view of a stabilizer for a lower link; ) And front view (b)
FIG. 12 is a plan view of a conventional lower link portion. FIG. 13 is a plan view (a) and a front view (b) of a lower link stabilizer having another configuration.
[Explanation of symbols]
1 Front frame 2 Side plate (front frame)
3 bumper (front frame)
4 Power Steering Cylinder Unit 5 Weight 5a Rear Ends 11a, 11b Power Steering Cylinder Unit Attachments 12a, 12b Weight Attachment 14 Weight Attachment 15 Internal Stay 15a Hook Support 21 Front Frame 22 Front Weights 22a, 22a Both Ends 23 Exhaust Pipe 24 Guide groove 25 Radiator 31 Two-column lops (standard position)
31a Retreat position 33 Support member 33a Mounting hole 35 Bracket 43 Support members 44a, 44b Adjusting member 51 Floor 53 Stabilizer fulcrum bracket 54 Floor mount mounting frame 55 Rear axle box 56 Stabilizer fulcrum 57 Lops 61 Stabilizer for lower link 62 Outer cylinder member 63 Inner member 67 Support shaft 68 Lever 71 Lower link 81 Lower link stabilizer 82 Support shaft 83 Lever 83a Flange portion 84 Stud member 85 Connection member

Claims (3)

A front frame for an axle bracket formed in a substantially U-shape by three members including left and right side plates extending forward from both sides of the engine and a bumper at a front end thereof;
In a front frame structure of a tractor including a power steering cylinder unit provided between left and right side plates of the front frame,
Weight mounting portions are formed on the left and right side plates and the bumper of the front frame, respectively.
A front frame structure of a tractor, wherein an integrated weight for front-rear balance is attached to three members of the front frame via these weight attachment portions. An internal stay that connects the left and right side plates is set up at a substantially intermediate position in the front-rear direction of the front frame, and a hook supporting portion that hooks and supports a rear end of the integrated weight is formed at an upper end of the internal stay. The front frame structure of a tractor according to claim 1, wherein: A front frame for an axle bracket formed in a substantially U-shape by three members including left and right side plates extending forward from both sides of the engine and a bumper at a front end thereof;
In a tractor front frame structure including an exhaust pipe for discharging engine exhaust gas from an outer portion of the front frame toward the front,
A front weight for fuselage balance is attached to the front of the bumper, and both ends of this front weight project outward from the bumper of the front frame in the vehicle width direction,
A front frame structure of a tractor, wherein a guide groove for receiving engine exhaust gas and guiding the exhaust gas to an open atmosphere side is formed in a portion facing the opening of the exhaust pipe.

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