JP5356348B2 - Forward / reverse switching operation device for traveling vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To signify a structure and to reduce the number of parts by interlocking the forward/backward movement of a shuttle lever to the spool of a switching valve via a rod link. <P>SOLUTION: The switching valve 4 for switching the forward-backward switching unit 2 is arranged in the sidewall of the transmission case 3 accommodating the hydraulic switching type forward-backward switching mechanism 2 and the shuttle lever 6 operating the switching valve 4 via the interlocking unit 5 is supported by the handle post 7, the switching valve 4 is arranged substantially the same position in the for and aft direction below the shuttle lever 6 with the spool 9 projected from the valve body 8. The interlocking unit 5 is constituted of the turning body 10 sliding the spool 9 by turning in front of the spool 9, the oscillating body 11 oscillating by the fore and aft movement of the shuttle lever 6, and the rod link 12 turning the turning body 10 by the oscillation of the oscillating body 11. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

Description

  The present invention relates to a forward / reverse switching operation device for switching a hydraulic switching type forward / backward switching device in a traveling vehicle such as a tractor.

2. Description of the Related Art Conventionally, a traveling vehicle control device that switches a forward / reverse switching mechanism is known.
In this control device, a support base is provided on a traveling machine body having a forward / reverse switching mechanism having a switching valve in a transmission, a handle post is supported on the support base via a tilt support shaft, and a support member is supported on the handle post. The forward / reverse lever shaft is pivotably supported and can be tilted integrally with the handle post. The forward / backward lever shaft and the forward / reverse lever shaft are moved forward and backward to operate the forward / reverse switching mechanism by rotating the forward / backward lever shaft. The switching mechanism is interlocked with the interlocking means (see Patent Document 1).

JP 2003-104085 A

  However, the interlocking means of the conventional control device has an arm provided on the forward / reverse lever shaft and an oscillating body connected to the arm and pivotally supported with respect to the handle post. And the switching valve are connected by a cable, and the cable is stretched, and it is necessary to convert the swing of the swinging body to the push-pull operation of the cable, resulting in a complicated structure and an increased number of parts. Yes.

  In view of these points, the present invention aims to facilitate the structure and reduce the number of parts by interlocking the sliding of the spool in the switching valve below the shuttle lever and the forward and backward movement of the shuttle lever with a link rod. Another object of the present invention is to provide a forward / reverse switching operation device for a traveling vehicle.

In order to solve the above problems, the present invention employs the following technical means.
First, a switching valve 4 for switching the forward / reverse switching mechanism 2 is provided on the side wall of the transmission case 3 housing the hydraulic switching type forward / reverse switching mechanism 2, and a shuttle lever that operates the switching valve 4 via the interlocking means 5. 6 is supported by the handle post 7,
The switching valve 4 is disposed at substantially the same position in the front-rear direction with the spool 9 protruding forward from the valve body 8 and below the shuttle lever 6.
The interlocking means 5 includes a rotating body 10 that slides the spool 9 by rotating in front of the spool 9, an oscillating body 11 that oscillates when the shuttle lever 6 moves back and forth, and an oscillation of the oscillating body 11. It is comprised with the rod link 12 which rotates the rotary body 10 by movement ,
The handle post 7 is supported by a support base 37 provided on the back surface of the partition wall 36 that partitions the engine room 35 and the operation space, and is tilted rearward and positioned substantially at the center in the left-right direction with respect to the transmission case 3. And
The oscillating body 11 is provided at the lower part of the handle post 7 and is located in front of the shuttle lever 6 so as to move the rod link 12 up and down when the shuttle lever 6 moves back and forth and swings around the left and right axis 13. The front part protruding to the top is connected to the upper part of the rod link 12,
The rod link 12 is positioned in front of the switching valve 4 and the shuttle lever 6, is formed in a curved shape protruding forward from the upper and lower parts to the middle part, rises from the side of the mission case 3, and rises above the mission case 3. It is characterized by being bent so as to approach the handle post 7 .

Second, the support base 37 is provided with a pedal shaft 40 that supports the left and right brake pedals 41L and 41R, and a brake rod 42L that transmits the rotation of the pedal shaft 40 downward is provided between the brake rotating body 43 and the brake rod 42L. The brake rotating body 43 is disposed in front of the rotating body 10, and the brake rod 42L is disposed substantially in parallel on the front side of the rod link 12,
The rod link 12 is provided with an adjustment portion 51 whose length can be changed in a straight portion, and is formed in a curved shape that approaches the brake rod 42L above the mission case 3 and below the handle post 7. And
Third, a left and right shaft 13 is rotatably supported on the handle post 7, and a front and rear shaft 14 is provided on the left and right shaft 13, and a fitting portion 15 below the shuttle lever 6 is rotated on the front and rear shaft 14. It is freely fitted, and the engaging portion 16 protrudes downward from the fitting portion 15,
The lever guide 17 in which the engaging portion 16 is engaged and disengaged by swinging the shuttle lever 6 around the front / rear shaft 14 and the engaging position of the engaging portion 16 is changed by swinging the shuttle lever 6 around the left / right shaft 13 is described above. provided on the handle post 7, wherein the Tei Rukoto.

According to the first aspect of the present invention, the rotating body that rotates by sliding of the spool in front of the switching valve disposed substantially the same in the front-rear direction below the shuttle lever and the swinging body that swings by the back-and-forth movement of the shuttle lever are provided. By interlocking with the rod link, the mechanism for changing the operation direction of each member can be reduced as much as possible, the operating device can be simplified, and at the same time, the number of parts can be reduced.
According to the invention which concerns on Claim 2, by forming the rod link arrange | positioned in front of a switching valve and a shuttle lever in the curve shape of forward protrusion, an operator's foot space is ensured and operativity can be improved.

  According to the invention of claim 3, the lever guide is provided in which the engagement position is changed by the front / rear / left / right movement of the shuttle lever pivotally supported by the left / right axis and the front / rear axis. By connecting the oscillating body to the rod link, the rod link does not oscillate even if the forward / reverse switching operation is performed, so the rod link trajectory during operation becomes smaller.

It is a side view of the forward / reverse switching operation device for a traveling vehicle according to the present invention. It is a rear view of the forward / reverse switching operation device. It is a rear perspective view of the forward / reverse switching operation device. It is an expansion perspective view of the shuttle lever pivoting part of the forward / reverse switching operation device. It is an expansion perspective view of a switching valve. It is a side view of a forward / reverse switching mechanism and a transmission.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 6 show a forward / reverse switching operation device 1 for a traveling vehicle according to the present invention.
In FIGS. 1 and 2, reference numeral 21 denotes a tractor exemplified as a traveling vehicle, in which the engine 22, flywheel housing 23, transmission case 3, front axle frame and the like are directly connected to form a vehicle body, and front wheels and rear wheels are suspended. A traveling machine body 24 is configured.

In this traveling machine body 24, a driver's seat is arranged on a floor seat on the rear side of the bonnet 25 covering the engine 22, and a control device 20 (forward / reverse switching operation device 1) is provided in the vicinity of the driver's seat.
In the flywheel housing 23 and the transmission case 3 below the control device 20, a travel transmission system that transmits the power from the engine 22 to the front wheels and / or the rear wheels via the flywheel 26 and the buffer mechanism (damper) 27. And a PTO transmission system transmission 28 is housed.

The traveling drive system of the transmission 28 includes a hydraulic switching type forward / reverse switching mechanism 2 that converts the power of the engine 22 into a mode of taking out the power in the forward direction and a mode of taking out the power in the reverse direction, and a main transmission that changes gears in three or four stages. 29, and a transmission such as the auxiliary transmission 30 that further decelerates.
The forward / reverse switching mechanism 2 has a forward hydraulic clutch 32 and a reverse hydraulic clutch 33 provided on a propulsion shaft 31 for transmitting engine power. By operating the forward hydraulic clutch 32, the forward rotation power of the propulsion shaft 31 is provided. Is transmitted to the downstream main transmission 29 and the reverse hydraulic clutch 33 is operated to reverse the power of the propulsion shaft 31 and transmit it to the main transmission 29.

The forward / reverse switching mechanism 2 also serves as a traveling main hydraulic clutch by disengaging both the hydraulic clutches 32 and 33, but a main clutch may be provided instead of the damper 27.
An oil passage for sending pressure oil to the hydraulic clutches 32 and 33 passes through the front shaft support holder 34 that supports the front portion of the propulsion shaft 31 and communicates with the switching valve 4 provided on the left and right side walls (left side wall) of the transmission case 3. The forward / reverse switching mechanism 2 is controlled by the switching valve 4.

The switching valve 4 is disposed at substantially the same position in the front-rear direction (slightly left position in the left-right direction) below the shuttle lever 6 that operates the forward-reverse switching mechanism 2 (see FIGS. 1 and 2).
As shown in FIG. 5, the switching valve 4 includes a valve body 8 having an oil passage communicating with the hydraulic clutches 32 and 33 of the forward / reverse switching mechanism 2, and a spool 9 protruding forward from the front portion of the valve body 8. I have. The spool 9 is supported by the valve body 8 so as to be slidable in the front-rear direction, and a rotating body 10 described later is connected to the front end.

The switching operation of the switching valve 4 is performed by a shuttle lever 6 supported by a handle post 7 described below via a rotating body 10, a swinging body 11 and a rod link 12 described later.
As shown in FIGS. 1 to 3, the handle post 7 is supported by a support base 37 provided on the back surface of a partition wall 36 that partitions the engine room 35 and an operation space (such as in the cabin). Many members constituting the control device 20 are supported on the support base 37, and a control panel 38, a control unit cover 39, and the like are attached thereto.

A pedal shaft 40 extending in the left-right direction is supported in a penetrating manner on the support base 37, and a pair of left and right brake pedals 41 </ b> L are provided at a right end portion (a portion protruding rightward from the support base 37) of the pedal shaft 40. 41R is supported in a suspended manner.
The left brake pedal 41L is for the rear wheel, and the pedal shaft 40 rotates integrally as the pedal is depressed. The rotation of the pedal shaft 40 is transmitted to the left side of the support base 37, and is transmitted as raising and lowering of the left brake rod 42L disposed substantially along the vertical direction via the arm. The force generated by the raising and lowering of the left brake rod 42L is transmitted rearward by the brake rotating body 43 while changing the direction rearward.

A post main body 44 of the handle post 7 is disposed behind the pedal shaft 40 of the support base 37. The post main body 44 supports a handle shaft 45 rotatably through a bearing. A handle 46 is provided at the upper end of the handle shaft 45, and the lower end of the handle shaft 45 is connected to operate a steering control valve (not shown).
As shown in FIG. 4, a substantially cylindrical shaft support member 47 extends left and right outwards on the left outer surface of the left vertical plate member 37 a on the left and right sides (left side) of the support base 37 of the handle post 7. The left and right shafts 13 extending in the left and right direction are rotatably supported in the shaft support member 47.

A pair of front and rear flat portions 13a is formed from the middle portion to the tip of the left and right shaft 13, and a swinging body (swinging arm) 11 extending in the radial direction from the base of the flat portion 13a, and the swinging arm 11 A front-rear shaft 14 extending in the front-rear direction is provided at a substantially central portion that is a predetermined distance away from the front.
An intermediate part (fitting part) 15 of the shuttle lever 6 is rotatably fitted to the front / rear shaft 14, and the fitting part 15 is a fitting body in which a plate is bent in a bifurcated manner in a substantially U shape. 15a and a cylindrical collar 15b provided before and after the bifurcated portion of the fitting body 15a.

The collar 15b is externally fitted to the front / rear shaft 14 penetrating the left / right shaft 13 and the fitting body 15a, and maintains a predetermined distance between the front and rear end portions of the front / rear shaft 14 and the fitting body 15a.
An urging tool 48 such as a helical spring is wound around the front and rear collars 15b, and the tip of the urging tool 48 is stretched around the left and right sides below the fitting body 15a. As a result, the lower portion of the shuttle lever 6 (an engaging portion 16 to be described later) is biased toward the side closer to the post body 44 (lever guide 17).

The lower end of the lever body 49 of the shuttle lever 6 extending upward is attached to the bent portion in the middle of the fitting body 15a.
The lever main body 49 of the shuttle lever 6 is curved to the side approaching the post main body 44 and then extends to the upper left and right. That is, when the lever main body 49, which is the upper part of the shuttle lever 6 extended to the upper left, is swung to the right (upward in the hand of the operator), the lower part of the shuttle lever 6 (engagement portion 16) Swing left about 14 times.

In addition, a lever guard 50 extending from the support material of the post body 44 to the upper left and right sides is provided substantially parallel to the direction in which the lever body 49 extends to the upper left side, preventing the lever body 49 from operating unexpectedly. (See FIG. 1).
1-4, the engaging part 16 which protruded below is provided between the bifurcated parts of the fitting body 15a lower part. The engaging portion 16 protrudes obliquely toward the side approaching the post main body 44, and the lever guide 17 is placed on the left vertical plate member 37 a of the support base 37 of the handle post 7 at a position where the protruding tip portion abuts. Is provided.

The lever guide 17 is provided on the left outer surface of the left vertical plate member 37 a and below the shaft support member 47 of the left and right shaft 13. And an abutting portion 17b that abuts.
As shown in FIG. 4, the abutting portion 17b is a plate having a notch 17c in the left and right outer portions, and the engaging portion 16 can be engaged with and disengaged from the bottom of the notch 17c and from the front to the rear. Three engaging grooves 17F, 17N, and 17B are formed side by side.

When the engaging portion 16 is locked in these engaging grooves 17F to 17B, the shuttle lever 6 is moved forward, neutral, and reverse in the forward / reverse switching mechanism 2 corresponding to forward, neutral, and reverse. It is positioned at position B.
In addition, the engaging portion 16 is urged by the above-described urging tool 48 so that the engagement state with the grooves 17F to 17B of the lever guide 17 is maintained, and this urging state is released. Swings the lever body 49 of the shuttle lever 6 upward (to the right) about the front-rear shaft 14.

After removing the engaging portion 16 from each of the engaging grooves 17F to 17B, the engaging position to be engaged with the other engaging grooves 17F to 17B is changed by swinging back and forth about the left and right shafts 13.
When the shuttle lever 6 swings back and forth around the left and right axis 13 (back and forth movement), the swing arm (swing body) 11 described above swings together.
The swing arm 11 is a plate material bent in a crank shape, extends forward from the base end of the flat portion 13a of the left and right shaft 13, and extends to the left and right outwards (left) by a predetermined length. , Extending forward.

An upper end (upper part) of a rod link 12 (to be described later) is pivotally supported at the extended tip, and the pivoting of the swing arm 11 around the left and right axis 13 (forward swing of the shuttle lever 6) is as follows. This is linked to the movement (lifting) of the rod link 12.
As shown in FIG. 1, the rod link 12 is a rod that extends substantially along the vertical direction at a position in front of the switching valve 4 and the shuttle lever 6. They are deployed in parallel.

The shape of the rod link 12 is formed in a curved shape protruding forward from the upper and lower parts to the middle part in a side view. As a result, a space can be secured under the operator's feet, and the pedals are not disturbed.
Further, since the left brake rod 42L and the rod link 12 are provided, the left brake rod 42L and the rod link 12 are not bulky in the front-rear direction because they are arranged along the longitudinal direction of the left brake rod 42L. Since the oscillating body 11 and the later-described rotating body 10 are also exposed, maintenance of the forward / reverse switching operation device 1 can be performed simultaneously.

In addition, the rod link 12 is provided with an adjusting portion 51 whose length can be changed in the middle portion, and the transmission case 3 from the upper part to the lower part in the vicinity of the shuttle lever 6 (oscillator 11) in the rear view. It is curved along the left side surface (see FIG. 2).
The lower end (lower part) of the rod link 12 is pivotally connected to the rotating body 10 described above.
As shown in FIGS. 1 and 5, the rotating body 10 includes a rotating shaft 52 erected leftward from the left side surface of the mission case 3, and a cylindrical member 53 externally fitted to the rotating shaft 52. And a spool arm 54 that extends in the radial direction from the side surface of the base end portion of the cylindrical member 53 and a rod arm 55 that extends in the radial direction from the side surface of the distal end portion of the cylindrical member 53.

The spool arm 54 is a plate material extending substantially upward from the cylindrical member 53, and the tip end portion of the spool 9 of the switching valve 4 is rotatably connected to the plate material by a stop shaft 56. The rotation around the moving shaft 52 is changed to the front / rear sliding of the spool 9.
The rod arm 55 is a plate material extending substantially forward from the cylindrical member 53, and the lower end of the rod link 12 is pivotally supported at the front end of the plate material, and is substantially along the vertical direction of the rod link 12. The rod arm 55 is rotated around the rotation shaft 52 by the lifting and lowering, and the spool 9 slides back and forth. The pivot support position between the rod link 12 and the rod arm 55 is in front of the rotation shaft 52 and the spool 9.

The rotating body 10, the oscillating body 11, and the rod link 12 described above constitute interlocking means 5 that interlocks the forward / backward swing of the shuttle lever 6 with the sliding of the spool 9.
The switching operation of the forward / reverse switching mechanism 2 by the rod link 12 that moves up and down in the forward / backward switching operation device 1 according to the present invention will be described.
As shown in FIG. 1, the shuttle lever 6 in the neutral position N swings the lever body 49 upward around the front-rear shaft 14 by the operator, so that the engaging portion 16 is attached to the urging tool 48. It swings to the left around the front / rear shaft 14 against the force.

  When the engagement between the engaging portion 16 and the engaging groove 17N is released by this swinging (lever lock release), and the shuttle lever 6 is swung forward (f direction) about the left and right shaft 13, the swing arm The (oscillator) 11 also swings downward about the left and right axis 13. As the swing arm 11 swings, the rod link 12 is pushed down, and the force is transmitted to the rod arm 55 of the rotating body 10 so that the tip is pushed down (f ′ direction).

By pushing down the rod arm 55, the spool arm 54 is rotated forward around the rotation shaft 52, and the spool 9 slides forward (f ″ direction) as the spool arm 54 rotates forward. As the spool 9 slides forward, the forward / reverse switching mechanism 2 is moved forward.
The shuttle lever 6 swings forward so that the engaging portion 16 below the shuttle lever 6 moves rearward and engages with the engaging groove 17F (forward position F) of the lever guide 17.

  On the contrary, the shuttle lever 6 at the forward movement position F or the neutral position N swings upward to release the engagement with the engagement grooves 17F and 17N, and then moves backward (b direction) around the left and right shafts 13. If it swings, the rod link 12 is pulled upward (b ′ direction) by swinging the swing arm 11 upward. By pulling up the rod arm 55, the spool arm 54 is rotated backward, and the spool 9 slides backward (b "direction), whereby the forward / reverse switching mechanism 2 is switched to the reverse state.

At this time, the engaging portion 16 below the shuttle lever 6 is engaged with the engaging groove 17 </ b> B (reverse position B) of the lever guide 17.
As described above, the rotating body 10 that is rotated by the sliding of the spool 9 in front of the switching valve 4 disposed substantially the same in the front-rear direction below the shuttle lever 6 and the swinging body 11 that is swung by the back-and-forth movement of the shuttle lever 6. By interlocking with the rod link 12, it becomes possible to change the direction of operation (turning and swinging) of each member without using a cable or the like, simplifying the structure of the operating device, and reducing the number of parts. Reduction, cost reduction and easy adjustment can be realized at the same time.

Further, the rod link 12 disposed in front of the switching valve 4 and the shuttle lever 6 is formed in a curved shape with a midway portion protruding forward, so that the operator's feet and other parts can be located behind the midway portion of the rod link 12. The space for placing the member can be secured to increase the space efficiency, and the operability of the forward / reverse switching can be improved.
Furthermore, a lever guide 17 whose engagement position is changed by the front / rear / left / right movement of the shuttle lever 6 pivotally supported by the left / right shaft 13 and the front / rear shaft 14 is provided so that the rod link 12 can be moved up and down by the forward / backward movement of the shuttle lever 6. By connecting the oscillating body 11 and the rod link 12, even if the forward / reverse switching mechanism 2 is switched, the rod link 12 only moves up and down, and the locus of the rod link 12 during operation is small. Thus, there is no need for a front / rear space for swinging, and the entire forward / reverse switching operation device 1 can be saved in space.

In addition, this invention is not limited to embodiment mentioned above. Each configuration of the forward / reverse switching operation device 1 or the like, or the overall structure, shape, dimensions, and the like can be appropriately changed in accordance with the spirit of the present invention.
Although the switching valve 4, the interlocking means 5, and the shuttle lever 6 are all provided on the left side of the mission case 3 and the handle post 7, they may be provided on the right side.

  The engaging portion 16 and the lever guide 17 of the shuttle lever 6 are arranged below the left and right shafts 13 and 14 and behind the rod link 12, but are engaged and disengaged when the shuttle lever 6 swings left and right. As long as the engagement position can be changed by swinging back and forth 6, the left and right inner sides of the left and right shafts 13 and 14 and the front side of the rod link 12 may be arranged.

DESCRIPTION OF SYMBOLS 1 Forward / reverse switching operation device of traveling vehicle 2 Forward / backward switching mechanism 3 Mission case 4 Switching valve 5 Interlocking means 6 Shuttle lever 7 Handle post 8 Valve body 9 Spool 10 Rotating body 11 Oscillating body 12 Rod link 13 Left and right axis 14 Front and rear axis 15 Fitting part 16 Engaging part 17 Lever guide

Claims (3)

A switching valve (4) for switching the forward / reverse switching mechanism (2) is provided on the side wall of the transmission case (3) housing the hydraulic switching type forward / backward switching mechanism (2), and this switching valve (4) is connected to the interlocking means (5 The shuttle lever (6) operated via the handle post (7) is supported by the handle post (7),
The switching valve (4) is disposed at substantially the same position in the front-rear direction with the spool (9) protruding forward from the valve body (8) and below the shuttle lever (6),
The interlocking means (5) includes a rotating body (10) that slides the spool (9) by rotating in front of the spool (9), and a rocker that swings by the back-and-forth movement of the shuttle lever (6). A moving body (11) and a rod link (12) for rotating the rotating body (10) by swinging of the swinging body (11) ;
The handle post (7) is supported in an upwardly inclined manner on a support base (37) provided on the back surface of the partition wall (36) separating the engine room (35) and the operation space, and is attached to the transmission case (3). On the other hand, it is located at the approximate center in the left-right direction.
The rocking body (11) is provided at the lower part of the handle post (7), and the rod link (12) is moved when the shuttle lever (6) moves back and forth and swings around the left and right axis (13). The front part protruding forward from the shuttle lever (6) is connected to the upper part of the rod link (12) in order to move up and down.
The rod link (12) is located in front of the switching valve (4) and the shuttle lever (6), is formed in a curved shape protruding forward from the upper and lower parts to the middle part, and from the side of the transmission case (3). A forward / reverse switching operation device for a traveling vehicle, characterized in that it is bent so as to approach the handle post (7) on the upper side of the mission case (3) . The support base (37) is provided with a pedal shaft (40) for supporting the left and right brake pedals (41L, 41R), and a brake rod (42L) for transmitting the rotation of the pedal shaft (40) downward is used for braking. The brake rotating body (43) is disposed in front of the rotating body (10), and the brake rod (42L) is arranged substantially parallel to the front side of the rod link (12). Has been
The rod link (12) is provided with an adjustment portion (51) whose length can be changed at a straight portion, and approaches the brake rod (42L) above the mission case (3) and below the handle post (7). The forward / reverse switching operation device for a traveling vehicle according to claim 1, wherein the traveling forward / backward switching operation device is formed in a curved shape . A left and right shaft (13) is rotatably supported on the handle post (7), a front and rear shaft (14) is provided on the left and right shaft (13), and a lower portion of the shuttle lever (6) is disposed on the front and rear shaft (14). The fitting portion (15) is rotatably fitted, and the engaging portion (16) protrudes downward from the fitting portion (15).
The engaging portion (16) is engaged and disengaged by swinging the shuttle lever (6) about the front and rear shafts (14), and the shuttle lever (6) is swinging about the left and right shafts (13). reverse switching operation apparatus before traveling vehicle according to claim 1 or 2 lever guide engaging position is changed (17), characterized in Tei Rukoto provided in the handle post (7).

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