JP2008011808A - Tending machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the operability of the speed change mechanism of a tending machine equipped with three speed change shifters. <P>SOLUTION: The tending machine is equipped with three change gears and three their sifters 51, 36 and 52, respectively and the speed change mechanism having a speed change lever 61 for moving each shifter forward and backward. When the speed change lever 61 is shaken around a shaking shaft 62b in a state in which the speed change lever is connected to the firsts shifter 51 or the second shifter 36, the first shifter 51 or the second shifter 36 in a connected state to the speed change lever 61 is moved forward and backward in the axial direction to horizontally extend and the corresponding change gear is moved. When the speed change lever 61 is rotated around a revolving shaft 62a perpendicular to the shaking shaft 62b, the third shifter 52 is moved forward and backward in the axial direction to horizontally extend and the corresponding change gear is moved. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a management machine.

Conventionally, as a transmission mechanism of a management machine, a transmission mechanism having a structure in which two shift shifters are shifted by one shift lever, or three shift shifters are operated by two shift levers. There is a shifting mechanism.
JP-A-8-37801

  By the way, in the speed change mechanism having the structure in which the three speed change shifters are operated by the two speed change levers, the speed change operation is complicated.

  Therefore, the present invention provides a traveling unit installed in the airframe, a tilling unit for performing tillage work, a prime mover that drives the traveling unit and the tilling unit, and a gear transmission that transmits the output of the prime mover to the traveling unit and the tilling unit. A transmission mechanism is provided, and the transmission mechanism is installed in the gear transmission unit so as to be movable in the direction of the rotation axis, and in the direction of the rotation axis so that the transmission can be shifted by moving the transmission gear. Each of which is provided with three shifters installed so as to be movable forward and backward, and has a shift lever for moving each shifter forward and backward, wherein the shift lever engages with the first shifter at a low speed. It is rotatable to a rotation position and a neutral rotation position that engages with the second shifter, and is swingable in the direction of the rotation axis. The shift lever is interlocked with the rotation of the shift lever. Shi A rotating member that rotates is interlocked and connected, and an engaged portion to be engaged with a third engaging portion provided in the third shifter is formed on the rotating member, and the third shifter is formed. The third engaging portion and the engaged portion of the rotating member are connected in a relationship of a slip pair that converts the rotation of the shift lever into the forward / backward movement of the third shifter and transmits it. When the lever is swung while engaged with the first shifter or the second shifter, the first shifter or the second shifter engaged with the shift lever moves forward and backward, and when the shift lever is rotated, Provided is a management machine characterized in that a third shifter moves back and forth.

  And this invention has the characteristics also in the following structures.

  The transmission mechanism includes an input shaft to which a rotational output of a prime mover is input, a traveling side output shaft that outputs rotation transmitted from the input shaft via the gear transmission unit to the traveling unit, and the gear from the input shaft to the gear. A tiller-side output shaft that outputs the rotation transmitted through the transmission unit to the tillage unit, and the first shifter moves the position of the corresponding first transmission gear by the forward / backward movement of the input shaft. A tilling neutral mode position that does not transmit rotation to the tilling side output shaft, a forward rotation mode position that transmits the rotation of the input shaft to the tilling side output shaft as a normal rotation, and a tilling side output shaft with the rotation of the input shaft as a reverse rotation. The second shifter transmits the corresponding second speed change gear to both the travel side output shaft and the tillage side output shaft by forward and backward movement. Neutral mode And a high speed forward mode position for transmitting the rotation of the input shaft to the traveling side output shaft as a high speed forward rotation and a reverse mode position for transmitting the rotation of the input shaft to the traveling side output shaft as a backward rotation. The third shifter is moved in a neutral mode position where the rotation of the input shaft is not transmitted to any of the traveling-side output shaft and the tillage-side output shaft, and a low-speed forward movement, by forward and backward movement. When the shift lever is turned to the forward / reverse rotation position, the third shifter is switched to the low speed advance mode and the shift lever is When engaged with the first shifter in the tillage side output shaft neutral mode and the shift lever is rotated to the neutral rotation position, the third shifter is switched to the neutral mode position. Shift lever can be engaged with the second shifter state of the neutral mode with Erareru.

  The third engaging portion is a protrusion, the engaged portion is a groove into which the third engaging portion is inserted, and the groove is formed with the third engaging portion. 3 is formed in a direction that intersects with the advancing / retreating direction of the shifter in an oblique state. When the shift lever is rotated, the groove formed in the rotating member is moved and engaged with the groove. The protrusion moves forward and backward along the groove, and the third shifter moves forward and backward.

  In the first aspect of the invention, the traveling unit installed in the body, the tilling unit for performing the tilling work, the prime mover for driving the traveling unit and the tilling unit, and the output of the prime mover are transmitted to the traveling unit and the tilling unit. A transmission mechanism including a gear transmission unit is installed, and the transmission mechanism is installed in the gear transmission unit so as to be movable in the direction of the rotation axis, and the transmission gear can be shifted by moving the transmission gear. It is a management machine provided with three shifters that are installed so as to be able to move forward and backward in the direction of the rotation axis, and also equipped with shift levers that move the shifters forward and backward. The shift levers engage with the first shifter. A low-speed forward rotation position that rotates and a neutral rotation position that engages with the second shifter, and can swing in the direction of the rotation axis. Movement A rotating member that rotates in conjunction with each other is interlocked and connected, and an engaged portion that engages with a third engaging portion provided in the third shifter is formed on the rotating member. The third engaging portion of the third shifter and the engaged portion of the rotating member are connected in a relationship of a slip pair that converts the rotation of the shift lever into the forward / backward movement of the third shifter and transmits it. When the shift lever is swung while being engaged with the first shifter or the second shifter, the first shifter or the second shifter engaged with the shift lever is moved forward and backward to rotate the shift lever. Then, the third shifter moves forward and backward.

  Thus, the low-speed forward rotation position that engages with the first shifter and the neutral rotation position that engages with the second shifter are rotatably provided, and the forward and backward movement directions of the first and second shifters are provided. And a pivoting member that pivots in conjunction with the gearshift lever, and is engaged with a third engagement portion provided in the third shifter. When the third engaging portion and the engaged portion are connected in a sliding pair relationship, three shifters can be operated with one shift lever. If three shifters can be operated with one shift lever, the operability of the shift operation is significantly improved.

  Further, in the present invention according to claim 2, the speed change mechanism outputs an input shaft to which a rotation output of the prime mover is input and rotation transmitted from the input shaft via the gear transmission unit to the traveling unit. A traveling-side output shaft, and a tilling-side output shaft that outputs rotation transmitted from the input shaft via the gear transmission unit to the tilling unit, and the first shifter responds by moving forward and backward. The position of the first transmission gear, the tillage neutral mode position in which the rotation of the input shaft is not transmitted to the tilling side output shaft, the forward rotation mode position in which the rotation of the input shaft is transmitted to the tilling side output shaft as the forward rotation, The rotation of the input shaft is switched to the reverse rotation mode in which the rotation of the input shaft is transmitted to the tilling side output shaft as a reverse rotation. Output shaft and tillage side output The neutral mode position that does not transmit to any of the above, the high speed forward mode position that transmits the rotation of the input shaft as a high speed forward rotation to the travel side output shaft, and the reverse mode that transmits the rotation of the input shaft as a reverse rotation to the travel side output shaft The third shifter transmits the position of the corresponding third transmission gear to both the travel-side output shaft and the tillage-side output shaft by moving forward and backward. Switching between a neutral mode position that is not performed and a low-speed forward mode position that is transmitted to the traveling-side output shaft as a low-speed forward rotation. When the shift lever is rotated to the forward / reverse rotation position, the third shifter moves forward at a low speed. When the speed change lever is engaged with the first shifter in the state of the tillage side output shaft neutral mode and the speed change lever is rotated to the neutral rotation position. Shift lever with serial third shifter is switched to the neutral mode position is adapted to engage with the second shifter state of the neutral mode.

  In such a configuration, the shift lever, which is positioned at a position corresponding to the neutral mode in which the rotation of the input shaft is not transmitted to either the traveling-side output shaft or the tilling-side output shaft, travels with the input shaft rotating at a high-speed forward rotation. Position corresponding to one of the high speed forward mode transmitted to the side output shaft, the reverse mode transmitted to the travel side output shaft as the rotation of the input shaft as the reverse rotation, or the low speed forward mode transmitted to the travel side output shaft as the low speed forward rotation It can be moved easily, and high operability is maintained. And while maintaining the state of the low-speed forward mode, forward rotation mode that transmits the rotation of the input shaft to the tillage side output shaft as forward rotation and reverse rotation mode that transmits the rotation of the input shaft to the tillage side output shaft as reverse rotation The operability is not impaired in this respect and the operability is excellent.

  According to a third aspect of the present invention, the third engagement portion is a protrusion, the engaged portion is a groove into which the third engagement portion is inserted, and the groove is the third engagement portion. When the shift lever is rotated, the groove formed in the swinging member moves when the shift lever is rotated. Thus, the protrusion engaged with the groove moves forward and backward along the groove, and the third shifter moves forward and backward.

  Using such a sliding pair coupling mechanism, when the third engaging portion of the third shifter is engaged with the engaged portion formed on the swinging member, the shift lever is reliably rotated. It is transmitted as a movement of the 3 shifter in the forward / backward movement direction, and a shift can be reliably performed.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a video display device according to the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, the management machine A includes a mission unit 2 formed by being bent into a substantially letter shape when viewed from the side, a prime mover unit 3 disposed in front of the mission unit 2, and a front side of the mission unit 2. A traveling unit 4 disposed in the lower part, a tilling work part (cultivation part) 5 disposed in the lower rear part of the mission part 2, and an operation part 6 disposed above the tilling work part 5 Is provided. The operation unit 6 is supported at the base end by the mission unit 2 and includes a handle 6a extending obliquely rearward therefrom.

  As shown in FIGS. 1 and 2, the mission case 2a of the mission unit 2 is installed between the traveling unit 4 and the tillage work unit 5 disposed below the management machine A, so that the side view is omitted. A bent portion 7 bent in a letter shape is provided. The transmission case 2a includes a traveling unit side case structure 8 that extends from the bent portion 7 to a front, rear, and rear inclined shape, and a tillage work unit side case configuration that extends from the bent portion 7 to a front, rear, and rear inclined shape. It consists of a body 9.

  The prime mover unit 3 includes a prime mover mounting table (not shown) attached to the lower front side of the mission unit 2, a prime mover 11 placed on the upper part thereof, and a fuel tank 12 attached to the upper part of the prime mover 11. Yes. In FIG. 1, reference numeral “13” denotes a bumper that also serves as a front weight.

  The traveling unit 4 includes a rotatable axle 14 attached in the vicinity of the lower end of the traveling unit side case structure 8 of the mission unit 2 in a state of extending in the left-right width direction. Wheels 15 are attached to the ends.

  The tillage working unit 5 includes a tillage side output shaft (not shown) that is rotatably attached to the rear lower portion of the tillage work unit side case structure 9 of the mission unit 2 in a state of extending in the left-right width direction. . The tiller-side output shaft includes a pawl shaft 16 that is detachably inserted into the tiller-side output shaft, and a plurality of tilling claws 16a that are erected radially outwardly from the outer periphery of the pawl shaft 16. A cylindrical rotary 17 provided is detachably attached. Accordingly, when the tillage side output shaft is rotated, the rotary 17 can be rotated and tilled.

  In addition, a rotary frame 18 is arranged on the upper inclined portion of the tilling work section side case structure 9 of the mission section 2 so as to project upward from the tilling work section 5 and toward the rear of the machine body. Rotary covers 19 and 19 are attached to the left and right sides of the rotary frame 18 so as to cover the upper part of 17.

  Further, a support bracket 20 is disposed at the rear end portion of the rotary frame 18, and a tilling depth adjusting bar 21 is pivotally supported on the support bracket 20 so as to be swingable in the front-rear direction.

  The operation unit 6 includes a handle 6a having a substantially gate shape in plan view attached to the middle part of the mission case 2a. The handle 6a is attached to the middle part of the transmission case 2a with an inclination of front, lower and rear, and a clutch lever 6b is provided at the upper end of the handle 6a.

  Next, the mission unit 2 of the management machine according to the present embodiment will be described in more detail with reference to FIGS. 3 shows a cross section passing through the axes 52, 51, 31, 34, 37 shown in FIG. 2, and FIG. 4 shows a cross section passing through the axes 36, 45 shown in FIG. In order to show the gear arrangement and the like in an easy-to-understand manner, a plurality of cross-sections bent halfway are shown in an expanded state.

  As shown in FIG. 3, an input shaft 31 extending in the left-right width direction is attached to the mission case 2 a on the upper front side of the bent portion 7. The input shaft 31 is rotatably mounted in a state of protruding to the left side of the mission case 2a, and is rotated by power from the prime mover unit 3 (see FIG. 1). Then, the rotation of the input shaft 31 powers the traveling side output shaft 32 that outputs power to the traveling unit 4 and the tillage working unit 5 via a speed change mechanism 40 (see FIG. 2) provided inside the mission case 2a. It is transmitted to the tilling side output shaft 33 for output.

  The speed change mechanism 40 includes a gear transmission unit 41 that includes a plurality of gears that transmit rotation input to the input shaft 31 to the travel-side output shaft 32 and the tillage-side output shaft 33. In this embodiment, the rotation of the input shaft 31 is transmitted from the first transmission gear body 42 of the input shaft 31 to the tillage-side output shaft 33 via the gear 43 of the first rotation shaft 34 and the gear 45 of the second rotation shaft 35. Is done. The rotation of the input shaft 31 is transmitted from the third transmission gear 46 (see FIG. 3) of the input shaft 31 to the second transmission gear 47 of the third rotation shaft (second shifter) 36, and then a gear (not shown) is turned on. Then, the rotation of the gear 47 is transmitted to the traveling output shaft 32 via the gear 44 (see FIG. 3) of the first rotating shaft 34 and the gear 48 (see FIG. 4) of the fourth rotating shaft 37.

  As shown in FIG. 3, among the gears constituting the gear transmission portion 41 of the speed change mechanism 40, the three speed change gears 42, 46, 47 are each supported in a freely slidable manner in the direction of the rotation axis thereof. ing.

  The first transmission gear body 42 is attached so as to rotate in conjunction with the input shaft 31, and is attached so as to be slidable in the axial direction. The first transmission gear body 42 includes a reverse gear 42a that has a large diameter and is used in the reverse rotation mode of the tilling work unit, and a normal rotation gear 42b that is a small diameter and is used in the normal rotation mode of the tilling work unit. .

  Further, the first transmission gear body 42 has a neutral mode position (cultivated neutral mode position, solid line position in FIG. 3) in which neither the reverse rotation gear 42a nor the normal rotation gear 42b meshes with other gears, and the neutral mode in FIG. 3 is the reverse position where the reverse gear 42a meshes with another gear (not shown) (the left one-dot chain line position in FIG. 3), and the right position of the neutral mode position in FIG. It is movable to a normal rotation mode position (right-hand dashed line position in FIG. 3) that meshes with a gear 43 attached to one rotation shaft 34.

  When the first transmission gear body 42 is positioned in the reverse rotation mode position (left one-dot chain line position in FIG. 3), the rotation of the input shaft 31 is transmitted from the reverse rotation gear 42a to the tillage side output shaft 33 via the gear 45, When located in the normal rotation mode position (right one-dot chain line position in FIG. 3), the rotation of the input shaft 31 is transmitted from the normal rotation gear 42b to the tillage side output shaft 33 via the gear 43 and the gear 45.

  The second transmission gear 47 is rotatably attached to the third rotating shaft 36 and is attached in a state of being positioned at a predetermined position in the axial direction. Therefore, when the third rotating shaft 36 moves in the axial direction, the third rotating shaft 36 moves integrally in the axial direction in conjunction therewith.

  Further, the second speed change gear 47 is engaged with a neutral mode position (one-dot chain line position on the right side of the solid line position in FIG. 3) that does not mesh with another gear, and meshes with a gear (not shown) to transmit reverse rotation to the traveling output shaft 32. To the reverse mode position (the rightmost one-dot chain line position in FIG. 3) and the high-speed forward mode position (solid line position in FIG. 3) that meshes with a gear (not shown) and transmits high-speed forward rotation to the tillage-side output shaft 33. The sliding movement is possible.

  When the second transmission gear 47 is positioned in the reverse mode position (the rightmost one-dot chain line position in FIG. 3), the rotation of the input shaft 31 is output from the gear 46 via the gear 47, the gear 44 and the gear 48 to the traveling side output. When transmitted to the shaft 32 and positioned at the fast forward mode position (solid line position in FIG. 3), the rotation of the input shaft 31 is transmitted from the gear 46 to the traveling output shaft 32 via the gear 47 and the gear 48.

  The third transmission gear 46 is attached so as to rotate in conjunction with the input shaft 31, and is attached so as to be slidable in the axial direction. Further, the third transmission gear 46 is in a neutral mode position (solid line position in FIG. 3) that does not mesh with any other gear, and a low-speed forward mode position (FIG. 3) that meshes with the gear 44 attached to the first rotating shaft 34. 3 is slidably movable.

  When the third transmission gear 46 is positioned at the low speed forward mode position (the one-dot chain line position in FIG. 3), the rotation of the input shaft 31 is transmitted from the gear 46 to the traveling output shaft 32 via the gear 44 and the gear 48. The

  The transmission mechanism 40 includes shifters 51, 36, and 52 for sliding the transmission gears 42, 46, and 47 in the axial direction.

  The first shifter 51 slides and moves the first transmission gear body 42, and includes a first shaft body 51a attached to the transmission case 2a so as to be slidable in the axial direction, and the first shaft body 51a. And a first shift plate 51b for moving the first transmission gear body 42 attached to the. The first shift plate 51b is engaged with the engagement recess 42c of the first transmission gear body 42. A right end portion (see FIGS. 3 and 4) of the first shifter 51 protrudes outside the transmission case 2a, and a shift lever 61 (described later) is detachably engaged with the protruding portion. One engagement groove 51c is formed. Therefore, when the first shaft body 51a of the first shifter 51 is moved forward and backward in the axial direction, the first transmission gear body 42 can be moved in the axial direction by the first shift plate 51b. Can be located at each mode position.

  As shown in FIG. 4, three spherical concave portions 51d are formed at the left end portion of the first shaft body 51a. A positioning ball body 55 biased by a spring 54 attached to the mission case 2a is pressed against the first shaft body 51a. Therefore, the first shifter 51 can be positioned by fitting the ball body 55 into each spherical recess 51d. The three positioning positions of the first shifter 51 are determined in correspondence with the mode positions of the first transmission gear body 42, and the first shifter 51 ensures that the first transmission gear body 42 is at a desired mode position. It can be positioned. Although omitted in the following description, the second shifter 36 and the third shifter 52 also have the same positioning structure so that the corresponding transmission gear can be reliably positioned at a desired mode position. .

  The second shifter 36 is a third rotating shaft 36 to which a second transmission gear 47 is attached. The right end portion of the second shifter 36 protrudes to the outside of the transmission case 2a, and a second engagement groove 36c is formed in the protruding portion for releasably engaging a shift lever 61 described later. ing. Therefore, when the second shifter 36 is moved back and forth in the axial direction, the second transmission gear 47 can be moved in the axial direction and positioned at each mode position.

  The third shifter 52 slides and moves the third transmission gear 46. The third shaft 52a is attached to the transmission case 2a so as to be slidable in the axial direction, and the third shaft 52a is attached to the third shaft 52a. And a third shift plate 52b for moving the attached third transmission gear 46. The third shift plate 52b is engaged with the engagement recess 46c of the third transmission gear 46. The right end portion (see FIGS. 3 and 4) of the third shifter 52 protrudes to the outside of the mission case 2a, and the protruding portion has a long groove (see FIG. 5) described later. A third engagement protrusion (third engagement portion) 52c with which the engaged portion) 65c is engaged is formed. As will be described later, the rotating member 65 rotates in conjunction with the rotation of the speed change lever 61. When the rotating member 65 rotates, the third shifter 52 moves forward and backward. Therefore, when the third shaft body 52a of the third shifter 52 is moved forward and backward in its axial direction, the third transmission gear 46 can be moved in the axial direction by the third shift plate 52b. It can be located in the mode position.

  As shown in FIGS. 1, 2, and 5, the speed change mechanism 40 includes a speed change lever 61 for moving the gears by moving the shifters 51, 36, 52 forward and backward.

  As shown in FIG. 5, the transmission lever 61 is disposed on the right side of the mission case 2 a in the traveling direction of the management machine, and is attached to the mission case 2 a via a bracket 62 at the base end portion. The bracket 62 is attached to the mission case 2a so as to be rotatable around an axis of a rotation shaft 62a extending in parallel with the axial direction of the input shaft 31 and the like. The transmission lever 61 is attached to the bracket 62 so as to be swingable about the swing shaft 62b orthogonal to the rotation shaft of the bracket 62. As shown in FIG. 5, the rotation shaft 62a is in the horizontal direction, and the swing shaft 62b is substantially in the vertical direction. That is, the transmission lever 61 is attached to the transmission case 2a so as to be rotatable in the vertical direction and swingable in the horizontal direction. Further, as shown in FIG. 5, a display panel 63 for displaying the operation state of the speed change lever is installed above the transmission case 2a. The speed change lever 61 is formed on the display panel 63. "" (Or "H" -shaped) groove 63a is inserted.

  The transmission lever 61 is disposed so as to extend obliquely rearward from the base end portion supported by the bracket 62 and is disposed so as to pass between the first shifter 51 and the second shifter 36. An operation gripping portion 61a is provided at the tip portion located obliquely rearward. Accordingly, when the grip 61a of the speed change lever 61 is moved upward, the speed change lever 61 rotates upward and engages with the second engagement groove 36c (see FIG. 3) of the second shifter 36. It will be in the position at the position. When the grip 61a of the shift lever 61 is moved downward, the shift lever 61 rotates downward and engages with the first engagement groove 51c (see FIG. 4) of the first shifter 51. It will be in the position of the moving position.

  Then, as shown in FIG. 5A, when the shift lever 61 engaged with the second engagement groove 36c of the second shifter 36 is swung left and right, the second shifter 36 is moved in the axial direction. It can be moved forward and backward. Thereby, it is possible to change the mode position of the second transmission gear 47 and change the speed.

  Specifically, as shown in the display panel 63, when the shift lever 61 engaged with the second shifter 36 and positioned in the neutral mode (N) position is swung to the left, the second shifter The second transmission gear 47 is moved to the left by 36, and the second transmission gear 47 is positioned at the high speed forward mode (F2) position. Further, when the transmission lever 61 is swung to the right, the second transmission gear 47 is moved to the right by the second shifter 36, and the second transmission gear 47 is positioned in the reverse mode (R) position. The mode position of the second transmission gear 47 is shown in FIG.

  Further, as shown in FIG. 5B, when the shift lever 61 engaged with the first engagement groove 51c of the first shifter 51 is swung left and right, the first shifter 51 is moved in the axial direction. It can be moved forward and backward. Thereby, the mode position of the first transmission gear body 42 can be changed to change the speed.

  Specifically, as shown in the display panel 63, when the shift lever 61 engaged with the first shifter 51 and positioned at the neutral mode position (F1) is swung to the left, the first The first transmission gear body 42 is moved to the left by the shifter 51, and the first transmission gear body 42 is positioned at the reverse rotation mode position (reverse rotation). Further, when the transmission lever 61 is swung to the right, the first transmission gear body 42 is moved to the right by the first shifter 51, and the first transmission gear body 42 is positioned at the normal rotation mode position (forward rotation). The mode position of the first transmission gear body 42 is shown in FIG.

  A rotating arm 64 is attached to the bracket 62 that rotates integrally with the speed change lever 61. The rotating arm 64 is a member extending upward from the bracket 62 and rotates integrally with the speed change lever 61.

  A rotating member 65 is attached above the third shifter 52 so as to be rotatable with respect to the mission case 2a.

  The rotating member 65 includes a tongue piece 65b extending to the right outside in the horizontal direction below the rotating shaft 65a (see FIG. 6A) (see FIG. 5B). The tongue 65b is formed with a long groove 65c that engages with the third engagement protrusion 52c of the third shifter 52. The long groove 65c extends in a direction crossing the forward / backward movement direction of the third shaft body 52a including the third engagement protrusion 52c obliquely, and the left side in the left-right direction (in the transmission case 2a) It is located on the near side) and is located on the right side in the left-right direction (the side far from the mission case 2a) as it is closer to the rear.

  Therefore, when the rotating member 65 rotates so that the tongue piece 65b moves rearward, the long groove 65c intersects the third shifter 52 at a position closer to the transmission case 2a, and engages with the long groove 65c. The third engaging protrusion 52c is moved to the side closer to the mission case 2a, that is, the left side in the management machine traveling direction. As a result, the third shifter 52 moves to the left side protruding from the mission case 2a, and the third transmission gear 46 moves to the left side and is positioned at the neutral mode position. On the other hand, when the rotating member 65 is rotated so that the tongue piece 65b moves forward, the long groove 65c intersects the third shifter 52 at a position closer to the transmission case 2a, and engages with the long groove 65c. The third engaging protrusion 52c is moved to the side closer to the mission case 2a, that is, to the left in the direction of travel of the management machine. As a result, the third shifter 52 moves to the left side immersed in the mission case 2a, and the third transmission gear 46 moves to the left side and is positioned at the low speed forward mode position.

  The upper end portion of the rotation arm 64 and the upper end portion of the rotation member 65 are connected via a rod 66. The rod 66 is connected to the rotating arm 64 at its front end so as to be rotatable about an axis parallel to the rotation axis direction of the speed change lever 61, and at its rear end to the rotating member 65, the rotating shaft. Are pivotally connected around an axis parallel to the axis.

  Accordingly, when the shift lever 61 is rotated so as to move the gripping portion 61a forward, the rotating member 65 rotates so that the upper end of the rotating arm 64 moves forward and the tongue piece 65b moves backward. Then, the third transmission gear 46 is located at the neutral mode position. To do. When the shift lever 61 is rotated so as to move the gripping portion 61a rearward, the rotating member 65 rotates so that the upper end of the rotating arm 64 moves rearward and the tongue piece 65b moves forward. The third transmission gear 46 is positioned at the low speed forward mode position.

  The case where the management machine provided with such a speed change mechanism is used will be described.

  The state shown in FIG. 5A and FIG. 6 is a state where the transmission lever 61 of the transmission mechanism 40 is in a so-called neutral position (neutral mode (N)). In this state, the rotation of the input shaft 31 is not transmitted to either the traveling side output shaft 32 or the tillage side output shaft 33. At this time, the transmission lever 61 is in a state of being engaged with the second shifter 36, and the second transmission gear body 47 is located at the neutral mode position. The state in which the second shifter 36 is engaged is a state in which the shift lever 61 is rotated forward (upward). At this time, the tongue piece 65b of the rotating member 65 is in a state of being rotated rearward, and the third shifter 52 is in a state of being moved to the left side (a state of being most immersed in the mission case). That is, the third transmission gear 46 is in the neutral mode position.

  The first shifter 51 is not engaged with the speed change lever 61, but when the speed change lever 61 is rotated downward, the second engagement groove 51c between the speed change lever 61 and the first shifter 51 is provided. Need to be located at a position where can be engaged. Therefore, when the transmission lever 61 is engaged with the second shifter 36, the first transmission gear body 42 is located at the neutral mode position.

  That is, in a state where the speed change lever 61 is in the neutral position, all the speed change gears 42, 46, 47 are located in the neutral mode position, and the rotation of the input shaft 31 is not transmitted.

  A shift state when the shift lever 61 is moved from this state will be described.

  When the shift lever 61 in the neutral position (N) is swung to the left, the second shifter 36 moves to the left. At this time, the first shifter 51 does not move because it is not engaged with the transmission lever 61. Further, since the third shifter 52 moves forward and backward only when the speed change lever 61 is rotated in the vertical direction, it does not move at this time. Therefore, at this time, the second shifter 36 only moves to the left side, and the second transmission gear 47 moves to the left side and is positioned at the high speed forward mode (F2) position. In this mode, the rotation of the input shaft 31 is transmitted to the traveling side output shaft 32 as a relatively high speed rotation, and the management machine A can be driven at a high speed.

  When the shift lever 61 at the neutral position (N) is moved to the right side, the second shifter 36 is moved to the right side. As in the case of moving to the left side, the first shifter 51 and the third shifter 52 do not move at this time. Accordingly, when the second shifter 36 moves to the right side, the second transmission gear 47 moves to the right side and is positioned in the reverse mode (R) position. In this mode, the rotation of the input shaft 31 is transmitted to the traveling output shaft 32 as a rotation in the reverse direction, and the management machine A can be moved backward.

  When the shift lever 61 at the neutral position (N) is rotated rearward (downward), the rotary arm 64 is rotated rearward, the tongue piece 65b of the rotary member 65 is moved forward, and the third shifter 52 is moved forward. Moves to the right from the mission case 2a, resulting in the state shown in FIG. 5B and FIG. At this time, the shift lever 61 is engaged with the second shifter 36 at the rotation start position and is engaged with the first shifter 51 at the rotation end position, but any shifter 36, 51 is in the rotation operation. Also not engaged. Therefore, in this operation, when the third shifter 52 moves to the right side, the third transmission gear 46 moves to the right side and is in a state of being positioned at the low speed forward mode (F1) position. This mode is also a mode in which the rotation of the input shaft 31 is transmitted to the traveling-side output shaft 32, but the traveling speed of the management machine A is set to be a relatively low speed suitable as a speed used in management work or the like. ing.

  When the shift lever 61 is moved to the left from the low speed forward mode (F1) state shown in FIGS. 5B and 7, the first shifter 51 is moved to the left. At this time, the second shifter 36 and the third shifter 52 do not move because they are not engaged with the transmission lever 61. Therefore, at this time, when the first shifter 51 moves to the left side, the first transmission gear body 42 moves to the left side and is positioned at the reverse rotation mode (reverse rotation) position. In this mode, the rotation of the input shaft 31 is transmitted not only to the traveling side output shaft 32 but also to the tilling side output shaft 33. The state of transmission of rotation to the traveling side output shaft 32 is the same state as the low speed traveling mode, and the management machine A can travel at a relatively low speed. On the other hand, reverse rotation is transmitted to the tilling side output shaft 33.

  Further, when the shift lever 61 is moved to the right from the low speed forward mode (F1) state, the first shifter 51 is moved to the right. At this time, the second shifter 36 and the third shifter 52 do not move as in the case of moving to the left side. Accordingly, when the first shifter 51 is moved to the right side, the first transmission gear body 42 is moved to the right side and is positioned in the forward rotation mode (forward rotation) position. Also in this mode, the rotation of the input shaft 31 is transmitted not only to the traveling side output shaft 32 but also to the tilling side output shaft 33. The state of transmission of rotation to the traveling side output shaft 32 is the same state as the low speed traveling mode, and the management machine A can travel at a relatively low speed. On the other hand, forward rotation is transmitted to the tilling side output shaft 33.

  Then, when the speed change lever 61 is rotated forward (upward) from the low speed forward mode (F1) state, the tongue piece 65b of the rotating member 65 is moved rearward, and the third shifter 52 is immersed in the mission case 2a. To move. At this time, the shift lever 61 only engages with the first shifter 51 at the rotation start position and only engages with the second shifter 36 at the rotation end position, and any of the shifters 36 and 51 during the rotation operation. Also not engaged. Therefore, when the third shifter 52 moves to the left, the third transmission gear 46 moves to the left, and the transmission lever 61 is in the neutral position.

  In addition to the operation of the speed change lever 61 described above, for example, there is an operation of returning the speed change lever 61 from the position corresponding to the high speed forward mode (F2) to the neutral position (N). This is a direction operation, and only the movement of each shifter and transmission gear is reversed, so that the description thereof is omitted here.

  As described above, according to the management machine of this embodiment, the three shifters 51, 36, and 52 can be operated with one shift lever 61, and the operability of the shift operation is significantly improved.

It is a perspective view showing the management machine of a 1st embodiment concerning the present invention. It is a side view which shows schematic structure of the transmission mechanism of the mission part of the management machine shown by FIG. It is sectional drawing which shows the BB surface of the transmission mechanism of FIG. It is sectional drawing which shows CC plane of the speed change mechanism of FIG. (A) is a perspective view showing the speed change mechanism in a state where the speed change lever is located at the neutral mode position, and (b) is a perspective view showing the speed change mechanism in a state where the speed change lever is located in the low speed forward mode position. . (A) is a top view which shows the speed-change mechanism in the state in which a speed-change lever is located in a neutral mode position, (b) is the side view. (A) is a top view which shows the speed change mechanism in the state in which a speed-change lever is located in a low-speed advance mode position, (b) is the side view.

Explanation of symbols

2a Mission case
31 Input shaft
32 Traveling side output shaft
33 Plow side output shaft
34 First rotation axis
35 Second rotation axis
36 3rd rotation axis (2nd shifter)
36c Second engagement groove
37 4th rotation axis
40 Transmission mechanism
41 Gear transmission
42 1st transmission gear body
42a high speed gear
42b reverse gear
42c Engaging recess
46 3rd speed change gear
46c engagement recess
47 Second gear
51 First Shifter
52 3rd shifter
61 Shift lever
62 Bracket
62a Rotating shaft
62b Oscillating shaft
63 Display panel
64 Rotating arm
65 Rotating member
66 Rod A Management machine

Claims (3)

A speed change mechanism including a traveling unit installed in the airframe, a tilling unit for performing tillage work, a prime mover that drives the traveling unit and the tilling unit, and a gear transmission unit that transmits the output of the prime mover to the traveling unit and the tilling unit. The speed change mechanism is installed in the gear transmission unit so as to be movable in the direction of the rotation axis, and is installed in a manner to be movable forward and backward in the direction of the rotation axis so that the speed change can be performed by moving the speed change gear. Each having three shifters and a shift lever for moving the shifters forward and backward,
The shift lever is rotatable to a low-speed forward rotation position that engages with the first shifter and a neutral rotation position that engages with the second shifter, and is swingable in the direction of the rotation axis.
A rotating member that rotates in conjunction with the rotation of the speed change lever is linked to the speed change lever,
The rotating member is formed with an engaged portion with which a third engaging portion provided in the third shifter is engaged,
The third engaging portion of the third shifter and the engaged portion of the rotating member are connected in a relationship of a slip pair that converts the rotation of the shift lever into the forward / backward movement of the third shifter and transmits it. And
When the shift lever is swung while being engaged with the first shifter or the second shifter, the first shifter or the second shifter engaged with the shift lever moves forward and backward.
A management machine characterized in that the third shifter moves forward and backward when the shift lever is rotated. The transmission mechanism includes an input shaft to which a rotational output of a prime mover is input, a traveling side output shaft that outputs rotation transmitted from the input shaft via the gear transmission unit to the traveling unit, and the gear from the input shaft to the gear. A tilling side output shaft that outputs the rotation transmitted through the transmitting unit to the tilling unit,
The first shifter has a tilling-side mode position in which the rotation of the input shaft is not transmitted to the tilling-side output shaft, and the position of the corresponding first transmission gear is moved forward and backward, and the rotation of the input shaft is set as the normal rotation. Switching between the forward rotation mode position transmitted to the output shaft and the reverse rotation mode transmitted to the tillage side output shaft as the reverse rotation of the input shaft,
The second shifter has a neutral mode position in which the rotation of the input shaft is not transmitted to either the traveling-side output shaft or the tillage-side output shaft, and the input shaft rotates at a high speed by moving forward and backward. A high speed forward mode position that transmits to the traveling side output shaft as a forward rotation and a reverse mode position that transmits the rotation of the input shaft to the traveling side output shaft as a backward rotation,
The third shifter is moved in a neutral mode position where the rotation of the input shaft is not transmitted to any of the traveling-side output shaft and the tillage-side output shaft, and a low-speed forward movement, by forward and backward movement. It is switched to the low speed forward mode position that is transmitted to the traveling side output shaft as rotation,
When the shift lever is rotated to the forward / reverse rotation position, the third shifter is switched to the low speed forward mode and the shift lever is engaged with the first shifter in the tilling side output shaft neutral mode,
2. When the shift lever is rotated to the neutral rotation position, the third shifter is switched to the neutral mode position and the shift lever is engaged with the second shifter in the neutral mode. Management machine as described in. The third engaging portion is a protrusion, the engaged portion is a groove into which the third engaging portion is inserted, and the groove is formed with the third engaging portion. It is formed in a direction that intersects the forward and backward movement direction of the 3 shifter in an oblique state,
The groove formed in the rotation member moves when the shift lever is rotated, and the protrusion engaged with the groove moves forward and backward along the groove, and the third shifter moves forward and backward. 2. The management machine according to 2.

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