JP2011131646A - Working vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate the attachment of a guide plate to an advancing/reversing change lever with a high degree of accuracy without complicating attachment work. <P>SOLUTION: A working vehicle includes an oscillation support shaft 21 supporting the advancing/reversing change lever 16 in a free and oscillatory operable manner across an advancing position capable of changing a traveling direction to advancing travel and a reversing position capable of changing it to reverse travel, and the guide plate 24 with a guide 23 engaged with the advancing/reversing change lever 16 and capable of selectively guiding the advancing/reversing change lever 16 to the advancing position and the reverse position. The guide plate 24 includes a fixed part 32 fixed in a support member 22 of the oscillation support shaft 21, and a support shaft insertion hole 35 for inserting the oscillation support shaft 21 and making the oscillation support shaft 21 and the guide plate 24 engaged with each other. The advancing/reversing change lever 16 includes an engagement shaft 30 engaged with the guide 23. The engagement shaft 30 is arranged substantially in parallel with the oscillation support shaft 21, and the guide 23 is formed on a plate surface orthogonal to the oscillation support shaft 21. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention includes a forward / reverse switching lever capable of switching the traveling direction to forward or reverse, and the forward / reverse switching lever swinging between a forward position where the traveling direction can be switched forward and a reverse position where the traveling direction can be switched backward. A swinging support shaft that is movably supported and engaged with the forward / reverse switching lever to form a guide portion that can selectively guide the forward / reverse switching lever to the forward position and the reverse position. The present invention relates to a work vehicle having a guide plate.

In the work vehicle, the forward / reverse switching lever is guided to a guide portion formed on the guide plate and is swung to a forward position or a reverse position. For this reason, there is a possibility that the forward / reverse switching lever cannot be swung to a predetermined forward position or reverse position due to an assembly error of the guide plate with respect to the forward / reverse switching lever.
In the conventional work vehicle described above, the guide plate is fixed to another member different from the support member of the swing support shaft. Therefore, another member is interposed between the guide plate and the support member (see, for example, Patent Document 1).

JP-A-8-28670

For this reason, the assembly accuracy of the guide plate with respect to the forward / reverse switching lever depends on the assembly accuracy of the guide plate with respect to another member and the assembly accuracy of the separate member with respect to the support member.
Therefore, in order to assemble the guide plate to the forward / reverse switching lever with high accuracy, both the assembly of the guide plate to another member and the assembly of the separate member to the support member require high accuracy, which complicates the assembling work. There are drawbacks.
The present invention has been made in view of the above circumstances, and an object thereof is to make it easy to assemble a guide plate with respect to a forward / reverse switching lever with high accuracy without complicating an assembling operation.

A first characteristic configuration of the present invention includes a forward / reverse switching lever capable of switching a traveling direction to forward or reverse, and a forward / reverse switching lever capable of switching the forward / reverse switching lever to a forward position and a reverse position. And a forward / backward switch lever, and the forward / backward switch lever can be alternatively guided to the forward position and the reverse position. A work vehicle having a guide plate forming a guide portion,
The guide plate includes a fixed portion fixed to a support member of the swing support shaft, and a support shaft insertion hole through which the swing support shaft is inserted to engage the swing support shaft and the guide plate. The forward / reverse switching lever includes an engagement shaft portion that engages with the guide portion, the engagement shaft portion is provided substantially in parallel with the swing support shaft, and the guide portion is provided with the swing support shaft. It exists in the point formed in the plate surface orthogonal to an axis | shaft.

In the case of the work vehicle of this configuration, the guide plate is fixed to the support member of the swing support shaft without interposing a separate member as in the prior art, so that the guide plate is fixed to the forward / reverse switching lever. Can be assembled.
Accordingly, the assembly accuracy of the guide plate with respect to the forward / reverse switching lever depends on the assembly accuracy of the guide plate with respect to the support member. Unaffected.
Further, since the guide plate has a support shaft insertion hole through which the swing support shaft supporting the forward / reverse switching lever is inserted and the swing support shaft is engaged with the guide plate, the swing support shaft is supported. By inserting the shaft through the shaft insertion hole and engaging with the guide plate, the relative position between the swing support shaft and the guide plate can be positioned, and the guide plate relative to the forward / reverse switching lever supported by the swing support shaft can be positioned. Easy assembly accuracy.
Further, the forward / reverse switching lever includes an engagement shaft portion that engages with the guide portion, and the engagement shaft portion is provided substantially in parallel with the swing support shaft. Compared to the case where the guide plate is provided along the orthogonal direction and is engaged with the guide portion, the guide plate can be disposed closer to the swing support shaft and more compactly arranged.
In addition, since the guide portion is formed on a plate surface perpendicular to the swing support shaft, when assembling the forward / reverse switch lever to the swing support shaft, the forward / reverse switch lever is moved from a direction parallel to the swing support shaft. The engaging shaft portion can be engaged with the guide portion by a series of operations assembled to the swing support shaft.
Therefore, the guide plate can be easily assembled to the forward / reverse switching lever without complicating the assembling work.

  A second characteristic configuration of the present invention includes a steering wheel and a rotation support shaft that rotatably supports the steering wheel, and the engagement shaft portion of the rotation support shaft is more than the swing support shaft. It is in the point provided so that it may engage with the said guide part in the side.

  In this configuration, the steering shaft and the guide plate forming the guide portion with which the engagement shaft portion engages are brought closer to the rotation support shaft side than the swing support shaft, and the steering wheel It can be placed well on the lower side.

  A third characteristic configuration of the present invention is that the guide plate integrally includes a bearing plate portion to which a bearing that rotatably supports the swing support shaft is fixed.

  In this configuration, in addition to inserting the swing support shaft through the support shaft insertion hole, the swing support shaft is rotatably supported by the bearing fixed to the bearing plate portion. The relative position with respect to the shaft can be positioned as the relative position between the guide plate and the bearing, and the assembly accuracy of the guide plate with respect to the forward / reverse switching lever supported by the swing support shaft can be further enhanced.

It is a whole side view of a work vehicle (tractor). It is a block diagram which shows a transmission structure. It is a side view which shows a steering operation part and a forward / reverse switching operation part. It is a top view in the direction view along the rotating shaft center of a steering wheel which shows a steering wheel and a forward / reverse switching lever. It is a principal part top view which shows the relationship between the rocking | fluctuation spindle and engagement shaft part of a forward / reverse switching lever, and the guide part of a guide plate. It is a side view of the vehicle body front view showing a steering operation unit and a forward / reverse switching operation unit. It is a disassembled perspective view of the principal part which shows the forward / reverse switching operation part.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall side view of a tractor as an example of a work vehicle according to the present invention, and FIG. 2 is a block diagram showing a transmission structure of the tractor.

  The tractor includes, at the rear of the engine 1, a clutch housing 2a that houses a main clutch 2, a transmission case 3 that houses a main transmission mechanism 3a, a forward / reverse switching mechanism 3b, an auxiliary transmission mechanism 3c, and a PTO transmission mechanism 3d, and a differential case 4a. Is connected to the rear transmission case part 4 including the housing frame 5 to form a body body 6.

  A front axle case 10 having left and right rear wheels 7 pivotally supported on a differential case 4a directly connected to the rear end of the transmission case 3 and a PTO shaft 8 projecting rearward so that left and right front wheels 9 can be steered. However, the front frame 11 connected to the engine 1 is mounted and supported in a freely rolling manner.

  The driving unit 12 mounted on the upper part of the fuselage body 6 includes a steering operation unit 15 that includes a steering wheel 14 that is rotatable on the front side of the driver seat 13 and that is linked to the left and right front wheels 9, and a traveling direction. And a forward / reverse switching operation portion 17 having a forward / reverse switching lever 16 that can be switched forward or backward.

As shown in FIGS. 3 and 6, the steering operation unit 15 includes a rotation support shaft 18 that supports the steering wheel 14 so as to be freely rotatable, and a power steering unit 19 that is directly connected to the rotation support shaft 18.
The rotary support shaft 18 and the power steering unit 19 are supported in an anti-vibration manner via an anti-vibration rubber 41 on a support box 20 fixed to the body body 6 side.

As shown in FIGS. 3, 4, 6, and 7, the forward / reverse switching operation unit 17 moves the forward / reverse switching lever 16 between a forward position where the traveling direction can be switched forward and a reverse position where the traveling direction can be switched backward. And a support member 22 (20, 26) for rotatably supporting the swing support shaft 21 in a state of retaining, and a forward / reverse switching. And a guide plate 24 that forms a guide portion 23 that engages with the lever 16 and can guide its swing movement, and the forward movement position is set on the front side of the vehicle body with respect to the reverse movement position.
The guide plate 24 is provided along a direction orthogonal to the swing support shaft 21. Therefore, the guide portion 23 is formed on a plate surface orthogonal to the swing support shaft 21.

The swing support shaft 21 can be operated to switch the forward / reverse switching mechanism 3b by the rotation of the swing support shaft 21 accompanying the swing operation of the forward / reverse switching lever 16 without using a universal joint. As shown in FIG. 6, the lower end 21a is bent into an L shape and linked to the switching member 25 for switching operation of the forward / reverse switching mechanism 3b.
Therefore, the linkage structure between the forward / reverse switching lever 16 and the forward / reverse switching mechanism 3b can be simplified, and the operating feeling of the forward / reverse switching mechanism 3b can be easily transmitted to the driver via the forward / backward switching lever 16.

As shown in FIG. 6, the support member 22 of the swing support shaft 21 is integrally fixed to the inside of the support tube 26 through which the swing support shaft 21 is inserted while preventing the swing support shaft 21 from coming off. And a support box 20.
The swing support shaft 21 is not supported on the rotation support shaft 18 side of the steering wheel 14 that is supported by vibration isolation, but is supported by a support member 22 (20, 26) that is not vibration isolation. Therefore, there is no possibility that the operational feeling of the forward / reverse switching lever 16 is impaired.
Therefore, vibrations from the rotary spindle 18 and the power steering unit 19 are not easily transmitted to the forward / reverse switching lever 16.

  As shown in FIGS. 3, 4, 6, and 7, the forward / reverse switching lever 16 includes a lever main body 27, a grip portion 28 that is fixed to the swing end side of the lever main body 27 and is gripped by the driver. In a plan view, the bolt is fixed so as to be swingable up and down around a horizontal axis Y that is not rotatable relative to the swing support shaft 21 and is orthogonal to the swing shaft core X1 (the shaft core of the swing support shaft 21). A U-shaped swing support portion 29 and an engagement shaft portion 30 that engages with the guide portion 23 of the guide plate 24 are provided.

  That is, the swing support portion 29 is assembled to the swing support shaft 21 from a direction parallel to the swing support shaft 21 together with the forward / reverse switching lever 16, and a through hole 29 a formed in the swing support portion 29; A bolt 40a is inserted through a through hole 21a formed at the tip of the swing support shaft 21, and is bolted so as to swing up and down around the axis Y of the bolt 40a with a nut 40b.

The forward / reverse switching lever 16 is bent in a “<” shape in a side view shown in FIG. 3, and in a plan view shown in FIG. 4 (in the direction of the rotation axis X <b> 2 of the steering wheel 14), The lever main body 27 is positioned rearward of the line segment connecting the gripping portion 28 and the swing axis X1 so that the gripping portion 28 side bends toward the front side of the vehicle body. 27 is formed in a “V” shape that is bent in a direction along the swing direction.
The forward / reverse switching lever 16 is a line connecting the bent portion 27a of the lever body 27 and the swing axis X1 so that the grip portion 28 side of the lever body 27 is bent toward the rear side of the vehicle body. It may be positioned in the front side of the vehicle with respect to the minutes and may be formed in a “<” shape.

The lever body 27 is integrally fixed to one end side of the swing support portion 29 by welding.
The engagement shaft portion 30 is integrally welded to the other end side of the swing support portion 29 so as to protrude downward in a direction substantially parallel to the swing shaft core X1, that is, the swing support shaft 21. It is fixed and is provided so as to engage with the guide portion 23 on the side of the rotation support shaft 18 relative to the swing support shaft 21.

  As shown in FIGS. 6 and 7, the grip portion 28 side of the forward / reverse switching lever 16 swings downward with respect to the swing support shaft 21, and the engagement shaft portion 30 moves away from the swing shaft core X <b> 1. A biasing spring 31 that biases to swing sideways is attached across the forward / reverse switching lever 16 and the swinging support shaft 21.

  The guide plate 24 is formed by bending a single belt-like flat plate, and is bolted to a support box 20 that is a support member 22 of the swing support shaft 21 as shown in FIGS. A fixed plate portion 32, a bearing plate portion 34 on which a bearing 33 that rotatably supports the swing support shaft 21 is bolted, a swing support shaft 21 inserted therethrough, and the swing support shaft 21 and the guide plate 24 Are integrally provided with a support shaft insertion hole 35 that engages and an engagement plate portion 36 that forms a guide portion 23 with which the engagement shaft portion 30 of the forward / reverse switching lever 16 engages.

  The guide portion 23 is engaged when the forward / reverse switching lever 16 moves to the forward movement position, and the forward-side hole end portion 37 with which the engagement shaft portion 30 contacts, and when the forward / backward movement switching lever 16 moves to the reverse movement position. The forward / reverse switching lever 16 is formed between the forward position and the reverse position, and between the forward position and the reverse position, with a long hole in an arc shape extending over the reverse side hole end portion 38 with which the shaft portion 30 contacts. Alternatively, it can be guided to the neutral position.

  Therefore, when assembling the forward / reverse switching lever 16 to the swing support shaft 21, the engagement shaft portion 30 can be inserted and assembled from above into the elongated hole that is the guide portion 23. The work can be simplified.

  When the forward / reverse switching lever 16 is moved to the neutral position, an engaging recess 39 is formed in the longitudinal central portion of the arc-shaped long hole so that the engaging shaft portion 30 enters and engages with the urging force of the urging spring 31. Thus, the forward / reverse switching lever 16 moving to the neutral position is prevented from unexpectedly moving to the forward movement position or the reverse movement position.

  Therefore, when the forward / reverse switching lever 16 that has been moved to the neutral position and the engagement shaft portion 30 is engaged with the engagement recess 39 is moved to the forward movement position or the reverse movement position, the gripping portion of the forward / reverse switching lever 16 is used. By oscillating the side of 28 against the urging force, the engagement between the engagement shaft portion 30 and the engagement recess 39 can be released and the oscillating movement can be made to the forward movement position or the reverse movement position.

  The forward / reverse switching lever 16 is located at a position lower than the steering wheel 14 as shown in FIG. 3 on the inner side of the outer periphery of the steering wheel 14 in a direction view along the rotational axis X2 of the steering wheel 14 shown in FIG. It is supported so as to be swingable around the swing center Z provided.

  Specifically, the swing center Z of the forward / reverse switching lever 16 is a horizontal axis that is an axis of a bolt 40 a that supports the swing support portion 29 so as to be swingable up and down with respect to the swing support shaft 21. This is the intersection of Y and the axis X1 of the swing support shaft 21.

  The forward / reverse switching lever 16 protrudes laterally outward from the outer periphery of the steering wheel 14 when viewed from the direction along the rotational axis X2 of the steering wheel 14 shown in FIG. To be supported.

  The swinging center Z of the forward / reverse switching lever 16 is located laterally outside the rotational axis X2 of the steering wheel 14 and on the front side of the vehicle as viewed along the rotational axis X2 of the steering wheel 14 shown in FIG. It is arranged in.

By arranging the swing center Z in this manner, the steering wheel radial direction from the outer periphery of the steering wheel 14 of the forward / reverse switching lever 16 in a direction view along the rotational axis X2 of the steering wheel 14 shown in FIG. Is set so that the protrusion amount d2 when the forward / reverse switching lever 16 is swung to the reverse position is smaller than the protrusion amount d1 when the forward / backward swing lever 16 is swung to the forward position.
The protrusion amount d when the forward / reverse switching lever 16 is operated to the neutral position is an intermediate value between the protrusion amounts d1 and d2.

  As shown in FIG. 3, the pivot axis X1 of the forward / reverse switching lever 16 (the pivot axis of the pivot support shaft 21) is higher toward the upper side of the rotation axis X2 of the steering wheel 14 than the rotation axis X2. It is inclined so as to be separated from the vehicle body front side.

By tilting the swing axis X1 in this way, the distance c between the forward / reverse switching lever 16 and the steering wheel 14 in the direction along the rotational axis X2 of the steering wheel 14 is set, and the forward / reverse switching lever 16 is moved to the reverse position. The distance c2 when the rocking operation is performed is set to be smaller than the interval c1 when the rocking operation is performed to the forward position.
The interval c when the forward / reverse switching lever 16 is operated to the neutral position is an intermediate value between the intervals c1 and c2.

  Therefore, it has the forward / reverse switching lever 16 inclined to the front side of the vehicle body as compared with the prior art, and when switched to forward, a sufficient vertical space is created between the steering wheel 14 and the forward / backward switching lever 16. This makes it easier to put a fist. When switching to reverse, the position of the grip part (lever grip) 28 does not drop so much and it is difficult to hit the knees and thighs of the driver.

[Other Embodiments]
The work vehicle according to the present invention may be a work vehicle having a guide plate 24 in which a groove-shaped guide portion 23 having a bottom portion is formed.

  The present invention can also be applied to a work vehicle other than a tractor, for example, an agricultural work vehicle such as a combine, or a construction work vehicle such as a backhoe.

14 Steering wheel 16 Forward / backward switching lever 18 Rotating support shaft 21 Swing support shaft 22 Support member 23 Guide portion 24 Guide plate 30 Engagement shaft portion 32 Fixing portion 33 Bearing 34 Bearing plate portion 35 Support shaft insertion hole X2 Rotating shaft core Z Oscillation center

Claims (3)

A forward / reverse switching lever capable of switching the traveling direction to forward or backward, and
A swing support shaft that supports the forward / reverse switching lever so as to be swingable between a forward position where the traveling direction can be switched forward and a reverse position where the traveling direction can be switched backward;
A work vehicle having a guide plate that engages with the forward / reverse switching lever and forms a guide portion that can selectively guide the forward / reverse switching lever to the forward position and the reverse position. ,
The guide plate includes a fixed portion fixed to a support member of the swing support shaft, and a support shaft insertion hole through which the swing support shaft is inserted to engage the swing support shaft and the guide plate. ,
The forward / reverse switching lever includes an engagement shaft portion that engages with the guide portion,
The engagement shaft portion is provided substantially parallel to the swing support shaft,
A work vehicle in which the guide portion is formed on a plate surface orthogonal to the swing support shaft. A steering wheel, and a rotation support shaft that rotatably supports the steering wheel;
The work vehicle according to claim 1, wherein the engagement shaft portion is provided to engage with the guide portion on a side closer to the rotation support shaft than the swing support shaft.   The work vehicle according to claim 1, wherein the guide plate is integrally provided with a bearing plate portion to which a bearing that rotatably supports the swing support shaft is fixed.

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