JP6025479B2 - Shifting lever check structure for walking type work machines - Google Patents

Description

  The present invention relates to a shift lever check structure for a walking work machine.

  An example of a conventional walking type work machine is disclosed in Patent Document 1. The walking type working machine described in Patent Literature 1 (in the literature, “powered tiller”) includes a transmission (in the literature, “sub transmission”, “main transmission”) that can change the speed of the traveling machine in a plurality of stages. And a shift lever (in the literature, “operation lever”) for performing a shift operation of the transmission. And the guide member in which the guide groove | channel ("shift operation path" in literature) which guides a speed-change lever to the some shift position corresponding to each of the several step of a transmission is provided. By moving the speed change lever to a desired speed change position in the guide groove, the speed change apparatus is operated to change the travel speed of the traveling machine body.

  In Patent Document 2, although it is not a walking work machine, among a plurality of shift positions corresponding to each of a plurality of stages of the transmission, a shift lever (in the document, “reverse operation position”) is set to a shift lever (in the document). , “A control lever”) is disclosed. In the shift lever restraining structure described in Patent Document 2 (in the literature, “a restraining member”), a guide groove (“lever guide hole” in the literature)) is formed in a straight line, and a guide groove is formed at the tip side portion of the guide groove. A contact bolt that is rotatable around a rotation axis along the vertical direction of the groove is provided. By rotating the contact bolt to the check position on the specific speed change position of the guide groove, the contact bolt contacts the speed change lever, thereby restraining the movement of the speed change lever to the specific speed change position. On the other hand, when the contact bolt is rotationally moved to the check release position that is out of the guide groove, the shift lever can be moved to the specific shift position of the guide groove.

Japanese Utility Model Publication No. 51-12333 (FIG. 11) Japanese Patent Laid-Open No. 7-17 (FIGS. 4 and 5)

Here, in the walking type working machine described in Patent Document 1, for example, a check structure that checks the movement to the shift lever to the specific shift position with the reverse high-speed position as the specific shift position among the plurality of shift positions. It has been demanded. Therefore, it is conceivable to apply the check structure described in Patent Document 2 to the walking work machine described in Patent Document 1.
However, in this case, when the contact bolt is rotated to the check release position around the pivot axis along the vertical direction of the groove, it is detached from the guide groove in the direction along the guide surface on which the guide groove is formed. A space for retracting the contact bolt over the entire length of the contact bolt must be provided in the guide member. Therefore, there is a problem that the guide member becomes large in the direction along the guide surface.

  In view of the above circumstances, an object of the present invention is to provide a shift lever check structure for a walk-type working machine that can check the movement of the shift lever to a specific shift position with a simple and compact configuration.

Shift lever restraint structure of the walk-behind working machine according to the first aspect of the present invention includes a shift freely transmission speed of the traveling machine body in a plurality of stages, a shift lever that performs the shifting operation of the transmission device, the transmission device A guide member formed with a guide groove for guiding the shift lever to a plurality of shift positions corresponding to each of the plurality of shift positions, and a check for suppressing movement of the shift lever to a specific shift position among the plurality of shift positions. a restraint releasing posture and freely posture changed to a plate-like restraint member to permit movement of said shift lever to said specific shift position and orientation, is provided, the particular guide groove corresponding to said specific shift position, the two Provided between the other guide grooves, and the specific guide groove and the two other guide grooves are connected to each other at the end opposite to the terminal end corresponding to the shift position, Same as the specific guide groove Extending from the terminal end side of the specific guide groove along the extending direction of the specific guide groove and rotatable about the axis along the extending direction. A cantilevered rotation shaft is provided, and the check member is attached to the rotation shaft so as to rotate integrally with the rotation shaft, and the guide groove is formed in the check posture. In plan view, the plate surface of the restraining member enters between the lower surface of the guide member and the rotation shaft and is positioned in the specific guide groove in a posture along the guide surface. In the guide surface view, the plate surface is in a posture orthogonal to the guide surface, and is located at a position between the specific guide groove and one of the other guide grooves, deviating from the specific guide groove. It is.

According to this arrangement, when the restraining posture 牽 system member, the restraint member became position along the guide surface, the specific guide grooves corresponding to the particular shift position covered, the shift lever can not be moved to a specific guide groove To be restrained. Therefore, by setting the check member to the check posture, the movement of the shift lever to the specific shift position is suppressed, and it is possible to prevent an operation not intended by the operator from appearing due to an operation mistake of the shift lever.
And when a check member is made into a check release posture, the check member will be in the position where it deviated from the specific guide groove, and the shift lever can be moved to the specific guide groove. At this time, the attitude of the restraining member is posture you perpendicular to the guide surface. Therefore, when the check member is set to the check release posture, the space occupied by the check member in the direction orthogonal to the extending direction of the specific guide groove can be made smaller than when the check member is set to the check posture. Therefore, since the size of the part of the guide member that is out of the guide groove required to retract the check member in the check release posture can be reduced, the guide member can be prevented from being enlarged, and the check structure has a simple and compact configuration. it can.

The said structure WHEREIN: It is suitable when the locking member which is provided in the side part of the said guide member and can lock rotation of the said rotating shaft is provided.
According to this configuration, switching between the check posture and the check release posture of the check member can be smoothly performed by turning the turning shaft. At this time, since the check member is attached to the rotating shaft, no space is taken in a direction orthogonal to the extending direction of the specific guide groove. Since the rotation shaft can be locked by the lock member, the check member can be reliably locked in each of the check posture and the check release posture. As a result, it is possible to prevent the restraining member from being arbitrarily changed between the restraining posture and the restraining release posture, and a highly reliable restraining structure can be achieved.

In the above configuration, it is preferable that the restraining member closes a start end side of the specific guide groove in the restraining posture.
According to this configuration, since the check member is provided on the start end side of the specific guide groove, the shift lever is stopped on the start end side of the specific guide groove, so that the shift lever moves to the specific guide groove. This can surely prevent the transmission from changing unexpectedly.

It is a side view of a walking type tiller. It is a cross-sectional rear view of a transmission. It is a figure which shows a transmission, (a) is a cross-sectional side view, (b) is a figure which shows an operation board. It is a guide surface view which shows the principal part of a driving | operation operation part when a check board is made into a check attitude | position. It is VV sectional drawing in FIG. It is a guide surface view which shows the principal part of a driving | operation operation part when a check board is made into a check release attitude | position. It is VII-VII sectional drawing in FIG. It is a perspective view which shows the principal part of a driving | operation operation part.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Basic configuration]
FIG. 1 shows a two-wheeled walking cultivator 10 (corresponding to a “walking working machine”) that can be shifted by a shifting lever 59. The walking type tiller 10 includes an engine 11, a drive wheel 12, a mission case 13, a hitch 14, and a driving operation unit 15. Both the mounting frame 17 on which the engine 11 is mounted and the frame frame 18 to which the hitch 14 is attached are integrally bolted to the transmission case 13 to form a part of the traveling machine body. In a normal operation in which the operator performs an operation while walking, as shown in FIG. 1, a rotary work device 20 is connected to the hitch 14. The power of the engine 11 is transmitted to the input shaft 23 of the transmission 22 by the belt interlocking mechanism 21 to drive the drive axle 24 that supports the drive wheels 12 and to drive the power take-out unit 34 that operates the rotary work device 20. It is configured as follows.

[Transmission 22]
The transmission 22 will be described.
As shown in FIGS. 2 and 3, the transmission 22 is configured to freely change the speed of the traveling machine body in a plurality of stages, and is stored in the mission case 13. The transmission 22 includes a gear transmission unit A and an axle transmission unit B that transmits the power of the output shaft 25 of the gear transmission unit A to the drive axle 24 in a chain.
The gear transmission unit A includes an input shaft 23, a transmission shaft 27, a first transmission shaft 28, a second transmission shaft 29, and an output shaft 25, as well as a first shift shaft 30 and a second shift shaft. A shaft 31 and a third shift shaft 32 are provided. As a result, the gear transmission unit A has a two-stage auxiliary transmission mechanism C, a forward / reverse transmission mechanism D capable of switching between forward and reverse, and a forward transmission mechanism E capable of switching between second forward speed and third forward speed. And the gear transmission unit A is configured to be capable of shifting in six forward speeds and two reverse speeds. That is, when the sub-transmission mechanism C is switched to the low speed state, the forward / reverse transmission mechanism D can be switched between the first forward speed and the reverse first speed, and the forward / reverse transmission mechanism D is switched to the first forward speed. Sometimes, the forward transmission mechanism E can be switched between the second forward speed and the third forward speed. When the sub-transmission mechanism C is switched to the high speed state, the forward / reverse transmission mechanism D can switch between forward 4 speed and reverse 2 speed, and when the forward / reverse transmission mechanism D is switched to forward 4 speed. The forward transmission mechanism E can be switched between forward 5 speed and forward 6 speed.
The transmission shaft 27 extends through the transmission case 13 to the outside, and a power take-out portion 34 is formed at the tip thereof by spline processing (not shown).

  As shown in FIG. 2, the sub-transmission mechanism C has a small-diameter low-speed drive shift gear 35 that can be shifted in an integrally rotated state by spline fitting, and a large-diameter high-speed drive gear 36 that can be rotated relative to the transmission shaft 27. A large-diameter low-speed driven gear 37 that can be engaged with the low-speed drive shift gear 35 and a small-diameter high-speed driven gear 38 that is always engaged with the high-speed drive gear 36 are spline-fitted to the first transmission shaft 28 in an integrally rotated state. Configured. Then, the low-speed drive shift gear 35 can be selectively engaged with either the internal gear 39 or the low-speed driven gear 37 formed in the middle in the radial direction of the high-speed drive gear 36 by a shift operation of the low-speed drive shift gear 35. It is as. That is, when the low-speed drive shift gear 35 is engaged with the low-speed driven gear 37, the low-speed state is established. When the low-speed drive shift gear 35 is engaged with the internal gear 39 and directly connected to the high-speed drive gear 36, the high-speed state is established.

  The forward / reverse transmission mechanism D includes a second shift gear 40 that is externally fitted to the first transmission shaft 28 by a spline, a back gear 41 that is externally fitted to the transmission shaft 27 by a bush, and a three-gear gear 42 that is externally fitted to the second transmission shaft 29. It consists of and. The small-diameter gear portion 43 of the back gear 41 and the large-diameter gear portion 45 of the trifurcated gear 42 are always meshed, and the second shift gear 40 is shifted to the left in FIG. 2 to mesh with the large-diameter gear portion 44 of the back gear 41. When the second shift gear 40 is shifted to the right in FIG. 2, it directly meshes with the large-diameter gear portion 45 and the forward state appears.

  The forward transmission mechanism E is relative to the third shift rotating body 46 that is externally splined to the central large diameter portion of the first transmission shaft 28, the three-gear gear 42 of the second transmission shaft 29, and the first transmission shaft 28. The intermediate drive gear 48 and the small drive gear 49 are rotatably fitted on the bush. The medium drive gear 48 is always engaged with the medium diameter gear portion 50 of the trifurcated gear 42, and the small drive gear 49 is always engaged with the small diameter gear portion 51 of the trifurcated gear 42, respectively.

  That is, when the third shift rotator 46 is shifted to the left in FIG. 2 and meshed with the middle drive gear 48, the second forward speed (or fifth speed) appears, and the third shift rotator 46 in FIG. When shifting to the right and meshing with the small drive gear 49, forward third speed (or sixth speed) appears.

Next, the shift operation structure will be described.
As shown in FIG. 3A, the first shifter 55 for operating the low-speed drive shift gear 35 is on the first shift shaft 30, the second shifter 56 for operating the second shift gear 40 is on the second shift shaft 31, and Third shifters 57 for operating the three-shift rotator 46 are respectively fitted to the third shift shaft 32.

  The sub-transmission mechanism C, the forward / reverse transmission mechanism D, and the forward / reverse transmission mechanism E all have a general structure that can be switched by pushing and pulling in the shift axis direction. A speed change operation is performed by a speed change operation linkage mechanism I including a lever 59 and an operation plate 60 that engages and moves in conjunction with the tip operation portion 58. The sub-transmission mechanism C is switched by a large vertical swing of the shift lever 59, and the forward / reverse transmission mechanism D and the forward transmission mechanism E are switched by a cross swing operation at both swing ends of the large swing operation. Has been.

  More specifically, the second operated portion 56a of the second shifter 56 and the third operated portion 57a of the third shifter 57 are arranged close to each other in the vertical direction, and the first shifter 55 is at a position slightly lowered from the second shifted portion 56a. 1st to-be-operated part 55a is arrange | positioned. The first operated portion 55a is formed in a pin shape, whereas the second operated portion 56a and the third operated portion 57a are of a general bifurcated shape.

  The operation plate 60 into which the first operated portion 55a is engaged is disposed so as to be slidable up and down immediately before the second operated portion 56a and the third operated portion 57a. Is placed in a state of being engaged.

  As shown in FIG. 3B, the operation plate 60 has an upper long hole 61 that is long to the left and right, a lower long hole 62 that is long to the left and right below the upper long hole 61, and a lower portion of the lower long hole 62. The deformation | transformation inclination hole 63 which is located and has an inclination groove part is formed. The upper operation piece 58a of the tip operation portion 58 can be engaged with the upper elongated hole 61, the lower operation piece 58b can be engaged with the lower elongated hole 62, and the first operated portion 55a is always engaged with the inclined hole 63. Has been.

  Next, the driving operation unit 15 will be described. As shown in FIG. 1, the driving operation unit 15 is provided with a steering handle 16. Further, as shown in FIGS. 4 to 8, the driving operation unit 15 is provided with a guide member 64 for guiding the speed change lever 59. The guide member 64 includes an upper surface portion 66 having a guide groove 65, a peripheral edge portion 67, and a lateral side portion 68. As shown in FIG. 1, the upper surface portion 66 is disposed such that the guide surface on which the guide groove 65 is formed is obliquely upward. The lateral side portion 68 is disposed so as to surround the upper surface portion 66. The peripheral edge portion 67 is formed to extend upward from the lateral side portion 68 to the upper surface portion 66.

  The guide groove 65 guides the shift lever 59 to a plurality of shift positions corresponding to each of a plurality of stages of the transmission 22. As shown in FIGS. 4 to 8, the guide groove 65 has a shape in which two horizontal H-shaped grooves are arranged vertically and the centers of these horizontal H-shaped grooves are connected by an I-shaped groove. . The two lateral H-shaped grooves correspond to the main speed change, and the I-shaped grooves correspond to the auxiliary speed change. The horizontal H-shaped groove located on the upper side of the guide groove 65 is the low speed region Lo of the main gear shift, and the forward first speed groove F1, forward second speed groove F2, forward third speed groove F3, and reverse first speed groove R1 are provided. Branched and arranged. The lateral H-shaped groove located on the lower side of the guide groove 65 is the high speed region Hi of the main speed change, and the forward fourth speed groove F4, the forward fifth speed groove F5, the forward sixth speed groove F6, and the reverse second speed groove R2. (Corresponding to “specific shift position” and “specific guide groove”) are branched and arranged.

  As shown in FIGS. 4, 6, and 8, the forward first speed groove F <b> 1 is disposed at the uppermost left of the guide groove 65, and the reverse first speed groove R <b> 1 is disposed right next to the forward first speed groove F <b> 1. The forward third-speed groove F3 is disposed immediately below the forward first-speed groove F1, and the forward second-speed groove F2 is disposed to the right of the forward third-speed groove F3. A forward fourth-speed groove F4 is disposed immediately below the forward third-speed groove F3, and a reverse second-speed groove R2 is disposed to the right of the forward fourth-speed groove F4. A forward sixth speed groove F6 is disposed one below the forward fourth speed groove F4, and a forward fifth speed groove F5 is disposed to the right of the forward sixth speed groove F6. The forward first speed groove F1, the forward third speed groove F3, the forward fourth speed groove F4, and the forward sixth speed groove F6 are provided side by side along the groove lateral width direction (X direction in the drawing). Yes. The reverse first speed groove R1, the forward second speed groove F2, the reverse second speed groove R2, and the forward fifth speed groove F5 are provided side by side along the groove lateral width direction (X direction in the drawing). The distance between the forward third speed groove F3 and the forward fourth speed groove F4 is the distance between the forward first speed groove F1 and the forward third speed groove F3 and the distance between the forward fourth speed groove F4 and the forward sixth speed groove F6. It is designed to be longer than the distance between them.

Next, the operation of the speed change operation will be described.
First, when the shift lever 59 shown in FIG. 3A is largely swung upward, the operation plate 60 is moved downward by the tip operating portion 58, and the upper inclined side 63a of the inclined hole 63 contacts the first operated portion 55a. Then, this is moved laterally to the left in FIG. Thereby, the subtransmission mechanism C is switched to the low speed state, and the upper operation piece 58a enters the third operated portion 57a. At this time, the lower operation piece 58b is not engaged with any of the operated pieces. Then, only the third operated portion 57a is operated by swinging the shift lever 59 left and right. If the shift lever 59 is swung to the left and moved to the forward first speed groove F1, the first forward speed appears, and the shift lever If 59 is swung to the right and moved to the first reverse speed groove R1, the first reverse speed appears.

  Next, when the shift lever 59 is swung slightly downward from the above state, the upper operation piece 58a is engaged with the second operated portion 56a, but the wide vertical width of the left and right ends of the inclined hole 63 is increased. The first operated portion 55a is maintained in a low speed state due to the interchange of the above. Even at this time, the lower operation piece 58b is not engaged with any of the operated pieces. Then, only the second operating portion is operated by swinging the shift lever 59 left and right. If the shift lever 59 is swung to the left and moved to the forward third speed groove F3, the third forward speed appears, and the shift lever 59 is moved. If it is swung to the right and moved to the forward second-speed groove F2, the second forward speed appears.

  When the shift lever 59 is swung downward greatly, the operation plate 60 is moved upward by the tip operating portion 58, and the lower inclined side 63b of the inclined hole 63 comes into contact with the first operated portion 55a. The subtransmission mechanism C is switched to the high speed state, and the lower operation piece 58b enters the third operated portion 57a. At this time, the upper operation piece 58a is not engaged with any of the operated pieces. Then, only the third operated portion 57a is operated by swinging the speed change lever 59 left and right, and if the speed change lever 59 is swung to the left and moved to the forward fourth speed groove F4, the fourth forward speed appears. If 59 is swung to the right and moved to the reverse second speed groove R2, the reverse second speed appears.

  Further, when the shift lever 59 is swung slightly downward from the above state, the lower operation piece 58b is engaged with the second operated portion 56a. However, due to the wide vertical width of the left and right ends of the inclined hole 63. Due to the accommodation, the first operated portion 55a maintains a high speed state. Even at this time, the upper operation piece 58a is not engaged with any of the operated pieces. Then, only the second operated portion 56a is operated by the left and right swing of the speed change lever 59, and if the speed change lever 59 is swung to the left and moved to the forward sixth speed groove F6, the sixth forward speed appears. If the 59 is swung to the right and moved to the forward fifth speed groove F5, the fifth forward speed appears.

[Check structure of transmission lever 59]
In order to prevent high-speed back travel from appearing due to a mistake in operating the speed change lever 59 during normal travel, the reverse second speed groove R2 of the guide groove 65 has a reverse second speed as shown in FIGS. A check structure 71 is provided in the groove R2 so that the shift lever 59 cannot be moved.
The check structure 71 includes a check plate 72 (corresponding to “a check member”), a rotation shaft 73, an operation tool 74, and a flange nut 76 (corresponding to a “lock member”). The check plate 72 is formed of a rectangular plate, is disposed below the upper surface portion 66 of the guide member 64, and is provided inside the guide member 64. As shown in FIGS. 4 and 5, the check plate 72 has a check posture for checking the movement of the shift lever 59 to the reverse second speed groove R2 (corresponding to a specific shift position), and as shown in FIGS. In addition, the posture is freely changeable to a check release posture that allows the shift lever 59 to move to the reverse second speed groove R2 (corresponding to a specific shift position). The check plate 72 has a length that is longer than the overall length of the reverse second speed groove R2 in the groove lateral width direction (X direction in the drawing) in the check posture, and the free end portion of the check plate 72 is at the intermediate portion thereof. It is formed in a bent shape that is bent so as to approach the rotating shaft 73 side. As shown in FIGS. 4 and 5, the check plate 72 has a substantially total length in the longitudinal direction of the reverse second speed groove R2 (Y direction in the drawing ; corresponding to “extending direction of the specific guide groove” ) in the check posture. Have the same length. Accordingly, the check plate 72 is provided so as to cover the entire reverse second speed groove R2 in the check posture.

The rotation shaft 73 is provided so as to be rotatable around an axis P along the groove front-rear direction (Y direction in the drawing), and a check plate 72 is attached to the rotation shaft 73. With respect to the attachment of the check plate 72 to the rotation shaft 73, welding or the like is performed on the lower surface portion on one side along the longitudinal direction of the reverse second speed groove R2 of the check plate 72 near the reverse second speed groove R2 of the rotation shaft 73. It is fixed by. The rotation shaft 73 extends from the front end of the reverse second speed groove R2 (corresponding to " starting end of the specific guide groove" ) to the rear end (" end of the specific guide groove" in the longitudinal direction of the groove (Y direction in the figure). The check plate 72 is provided so as to extend rearward from the front end portion of the reverse second speed groove R2 of the rotating shaft 73 in the longitudinal direction of the groove (Y direction in the drawing). It is provided over the entire length of the part up to the part. Further, the check plate 72 is provided so as to extend from the rotation shaft 73 to the side approaching the reverse second-speed groove R2 in the groove lateral width direction (X direction in the drawing). The rotation shaft 73 is disposed below the upper surface portion 66 of the guide member 64 and is provided inside the guide member 64. The position of the rotation shaft 73 in the groove width direction (X direction in the figure) is between the reverse second speed groove R2 and the forward second speed groove F2, and the reverse second speed groove R2 and the forward second speed groove F2. To fit in the gap between the two. Thereby, by rotating the rotation shaft 73 around the axis P, the check plate 72 is also rotatable around the axis P, and the check plate 72 is rotated around the axis P. By turning, a check posture and a check release posture are provided so that the posture can be freely changed. Further, the check plate 72 is rotatable at a front side portion in the groove front-rear direction (Y direction in the drawing) of the reverse second speed groove R2, and is provided so as to appropriately cover the reverse second speed groove R2 in the check posture. ing.

  The rotation shaft 73 extends outward through the lateral side portion 68 of the guide member 64, and an operation tool 74 is fixed to the extended portion. A washer 75 is attached to the rotating shaft 73 between the lateral side portion 68 and the operation tool 74, and a flange nut 76 is screwed to the tip of the extending portion of the rotating shaft 73. Accordingly, the rotation of the rotation shaft 73 can be locked by tightening the flange nut 76.

A bent portion 77 (corresponding to a “projecting portion”) that is bent toward the guide groove 65 is formed at the distal end portion of the operation tool 74. The bent portion 77 abuts on the side end portion 67 </ b> A of the peripheral edge portion 67 when the operation tool 74 is swung, thereby restricting the rotation range of the rotation shaft 73. By rotating the rotation shaft 73 by operating the operation tool 74, the check plate 72 is in a check posture covering the reverse second speed groove R2, and a position completely removed from the guide groove 65 including the reverse second speed groove R2. It is possible to switch between the check release posture.

[Checking posture]
When normal work is performed with the walking type tiller 10, the check plate 72 is set to the check posture so that the shift lever 59 cannot move to the second reverse speed.
FIG. 4 and FIG. 5 show diagrams when the check plate 72 is in the check posture. In order to set the check plate 72 to the check posture, the flange nut 76 is loosened and the operation tool 74 is swung forward, so that the front portion of the bent portion 77 of the operation tool 74 is the side end of the peripheral edge 67. The rotating shaft 73 is rotated until it comes into contact with 67A. As a result, the shielding surface of the check plate 72 becomes substantially parallel to the guide surface, and the shift lever 59 cannot be moved to the reverse second speed groove R2 by the check plate 72. At this time, the check plate 72 overlaps the front end portion of the reverse second speed groove R2 in the guide surface view. Even if the check plate 72 in the check posture is pushed by the transmission lever 59, the force acts in the direction of the axis P of the rotation shaft 73, so the rotation shaft 73 does not rotate, and the check plate 72 It is possible to prevent the check posture from being released.

[Check release posture]
For example, when the trailer work is performed with the walking type tiller 10, the check plate 72 is set to the check release posture so that the shift lever 59 can move to the second reverse speed.
FIGS. 6 to 8 show views when the check plate 72 is in the check release posture. In order to set the check plate 72 to the check release posture, the flange nut 76 is loosened, the operation tool 74 is swung back, and the rear portion of the bent portion 77 of the operation tool 74 is the side end of the peripheral edge 67. The rotating shaft 73 is rotated until it comes into contact with 67A. As a result, the check plate 72 is retracted to a position disengaged from the reverse second speed groove R2, and the speed change lever 59 can be moved to the reverse second speed groove R2.

  When the check plate 72 is in the check release position, the check plate 72 is orthogonal to the guide surface between the reverse second speed groove R2 and the forward second speed groove F2 adjacent to the reverse second speed groove R2 in the groove width direction of the reverse second speed groove R2. It is retracted in an orthogonal vertical posture that is a posture along the groove vertical direction (Z direction in the figure). Thereby, the projected area in the guide surface view of the restraint plate 72 in the restraint release posture is smaller than the projected area in the guide surface view of the restraint plate 72 in the restraint posture. Moreover, since the free end part in the check plate 72 is bent so that it may approach the rotation axis | shaft 73 side in the intermediate part, the check plate 72 is formed in the bent shape in the intermediate part. It is possible to prevent 72 from interfering with the speed change lever 59.

  Therefore, the check structure 71 including the check plate 72, the rotation shaft 73, and the like is arranged without difficulty on the lower side of the portion between the reverse second speed groove R2 and the forward second speed groove F2 in the upper surface portion 66 of the guide member 64. be able to.

[Another embodiment]
(1) In the above embodiment, the flange nut 76 is used as the lock member. However, the present invention is not limited to this, and any lock member may be used as long as the rotation of the rotation shaft 73 can be locked. For example, two insertion holes perpendicular to the axis P are formed in the rotation shaft 73 in the circumferential direction, and a fixing pin having a bent portion at one end is inserted into one of the insertion holes. It is good also as a structure which locks the rotating shaft 73 by hooking a bending part on the side edge part 67A of the peripheral part 67. FIG. At this time, each insertion hole corresponds to a check posture and a check release posture of the check plate 72, respectively.

(2) In the above embodiment, the transmission 22 has been described as shifting to six forward speeds and two reverse speeds, but the number of shiftable stages is not limited to this. For example, a transmission that can be switched between eight forward speeds and four reverse speeds may be used.

(3) In the above embodiment, the guide groove 65 has a shape branched to a plurality of shift positions. However, the present invention is not limited to this. For example, the guide groove has a continuous linear shape without branching, and a plurality of shift positions are continuously arranged in the guide groove, and a check structure is provided in a specific guide groove corresponding to the specific shift position among the shift positions. 71 may be provided.

(4) In the above embodiment, the operation tool 74 can position the check plate 72 in both the check posture and the check release posture. However, the present invention is not limited to this. The check plate 72 may be an operation tool 74 that can be positioned only in one of the check posture and the check release posture.

(5) Although the bent portion 77 is provided in the operation tool 74 in the above embodiment, the bent portion 77 may not be provided. Further, the operation tool 74 may not be provided.

(6) In the above embodiment, the rotation shaft 73 is disposed between the reverse second speed groove R2 and the forward second speed groove F2, but it rotates between the forward fifth speed groove F5 and the reverse second speed R2. The shaft 73 may be disposed.

(7) In the above embodiment, the specific guide groove is the reverse second-speed groove R2, but it is not limited to this. The specific guide groove may be a reverse first speed groove R1 corresponding to the back travel or a forward sixth speed groove F6 corresponding to the high speed forward travel. The guide groove 65 may be provided with a plurality of specific guide grooves.

(8) Although the walking type tiller 10 has been described in the above embodiment, other walking type working machines such as a walking type mower may be used.

10: Walking type tillage machine ("Walking type working machine")
22: transmission 59: transmission lever 64: guide member 65: guide groove 68: lateral side 71: check structure 72: check plate ("check member")
73: Rotating shaft 74: Operating tool 76: Flange nut ("Lock member" )
R 2: Reverse second speed groove (“specific guide groove”)
P: shaft center Y: longitudinal direction of groove ("extending direction of specific guide groove")

Claims (3)

A transmission that can change the speed of the traveling machine in multiple stages;
A shift lever for performing a shift operation of the transmission,
A guide member formed with guide grooves for guiding the shift lever to a plurality of shift positions corresponding to the plurality of stages of the transmission,
A plate-like restraint whose posture can be freely changed between a restraint posture for restraining the movement of the shift lever to a specific shift position among a plurality of shift positions and a restraint release posture for allowing the shift lever to move to the specific shift position. A member, and
The specific guide groove corresponding to the specific shift position is provided between two separate guide grooves, and the specific guide groove and the two separate guide grooves correspond to the respective shift positions. It is connected at the end opposite to the end,
The shaft extends along the extending direction of the specific guide groove from the end portion side of the specific guide groove at a location between the specific guide groove and one of the other guide grooves, and the axial center along the extending direction. It has a cantilevered rotation shaft that can rotate around
The restraining member is attached to the pivot shaft so as to rotate integrally with the pivot shaft. In the restraining posture, the guide member in which the guide groove is formed and the lower surface of the guide member and the guide shaft are formed. The plate surface of the check member enters between the rotation shafts and is positioned in the specific guide groove in a posture along the guide surface. In the check release posture, the plate surface is in the guide surface view. A shift lever check structure for a walk-type working machine that is positioned at a position between the specific guide groove and one of the other guide grooves, in a posture orthogonal to the guide surface.   The shift lever check structure for a walk-type work machine according to claim 1, further comprising a lock member provided on a lateral side portion of the guide member and capable of locking the rotation of the rotation shaft. The shift lever check structure of the walking type work machine according to claim 1 or 2 , wherein the check member closes a start end side of the specific guide groove in the check posture.

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