JP5867891B2 - Transplanter - Google Patents

Description

  The present invention relates to a transplanter such as a riding rice transplanter, and more particularly to a planting transmission device that transmits to a planting device at constant speed rotation or non-uniform speed rotation.

  Generally, the planting machine of a transplanter is provided with a planting device for planting seedlings on a seedling platform into soil. The planting device has a rotary case with planting claws attached to both ends and supported by the planting drive shaft, and performs planting by rotating the rotary case by the rotation of the planting drive shaft.

  Conventionally, a transplanter has been devised that includes a switching mechanism that switches between a constant speed transmission device and a constant speed transmission device that periodically rotate a rotation during one rotation in the transmission path of the planting drive shaft. (See Patent Document 1).

  When transmitting the non-uniform speed rotation to the planting drive shaft, the rotation of the rotary case is more than the driving force that rotationally drives the planting drive shaft when the planting drive shaft rotates from the acceleration region to the deceleration region. May be preceded by inertia. In such a case, the planting drive shaft may be rotated in advance by an amount corresponding to the backlash of the gear that constitutes the planting transmission device, and the seedling may be detached from the planting claws due to the impact of stopping this rotation. . In order to suppress the preceding rotation, a transplanter including a brake mechanism that applies a braking force to the rotation of the planting drive shaft has been devised (see Patent Document 1 and Patent Document 2).

  Also, a transplanter has been devised in which the inconstant speed transmission device and the brake mechanism are housed in one case and the case is arranged on the transmission upstream side of the planting transmission device (see Patent Document 2).

JP 2008-263879 A JP 2006-262758 A

  The transplanter described in Patent Document 1 has both the switching mechanism and the brake mechanism described above, but the switching mechanism is provided in the transmission case, and the large-capacity (sparse) At the same time as switching to the (planting) side, it is switched from constant speed rotation to non-constant speed rotation. The brake mechanism is provided in each planting transmission case (planter case) and acts on the planting drive shaft. When the brake mechanism is actuated during constant speed rotation, the periodic braking force will have an adverse effect. Therefore, a braking force switching means is provided that operates the braking force strongly during non-constant speed rotation and weakens the braking force during constant speed rotation. It has been. Thus, since the switching mechanism and the brake mechanism are provided in different places (in different cases), the configuration of the planting transmission device itself is complicated. Further, since the brake mechanisms are respectively provided in a plurality of planting transmission cases, a plurality of brake mechanisms are required. Furthermore, in addition to the switching operation of constant speed and unequal speed, switching operation of the strength of the braking force is required, which is troublesome and causes an erroneous operation.

  In the transplanter described in Patent Document 2, braking force can be applied to a plurality of planting drive shafts with one brake mechanism housed in the case. In comparison, the structure of the planting transmission device can be simplified, and the planting transmission device itself can be made compact. However, only the inconstant speed transmission device and the brake mechanism are accommodated in the case, and no switching mechanism for switching between the inconstant speed transmission path and the constant speed transmission path is provided. For this reason, the rotation from the power source can be transmitted to the planting drive shaft only by non-uniform speed rotation, and the operator can perform the planting work only by non-uniform speed rotation.

  Therefore, an object of the present invention is to provide a transplanter in which a transmission switching mechanism and a brake mechanism for switching between a constant speed transmission path and a non-constant speed transmission path are provided in the same case, and which solves the above problems.

The present invention shifts the rotation of the power source with the transmission (30) and further branches and transmits the planted transmission to each planting apparatus (17), and the transmission with the transmission (30). In the transplanter (1) comprising: a traveling transmission device (48) that transmits the rotated rotation to the traveling wheels (2, 3);
In the planting transmission device (44), there is interposed a transmission case (25) containing an inconstant speed transmission device (51) for transmitting the output side to the output side by rotating the rotation of the input side shaft (52) to an inconstant speed. ,
In the transmission case (25), a transmission path through the inconstant speed transmission device (51) and a transmission path for transmitting the rotation of the input side (52) shaft to the output side shaft (53) at a constant speed rotation. A transmission switching mechanism (62) for switching;
In conjunction with the transmission switching mechanism (62), a brake mechanism (63) that is switched to a non-operating state in a state of transmitting constant speed rotation and switched to an operating state in a state of transmitting non-uniform rotation , The transmission path for transmitting the constant speed rotation is supported by the transmission case (25), and is arranged on one axis and separated from each other on the input side shaft (52) and the output side shaft (53). And
The unequal speed transmission device (51) includes a counter shaft (55) supported by the transmission case (25), and the output shaft from the input shaft (52) via the counter shaft (55). And a gear train (56, 57, 60, 61) for transmitting power to the shaft (53) of the first eccentric gear (56) and the first eccentric gear ( 56) and a second eccentric gear (57) meshing with
The transmission switching mechanism (62) connects or separates the input-side shaft (52) and the output-side shaft (53), and connects and disconnects power transmission via the gear train (64). )
The brake mechanism (63) includes a cam (66) interposed in the transmission path of the inconstant speed transmission device (51), and a brake piece (67) slidably contacting the cam (66).
It is characterized by that.

The cam (66) of the brake mechanism (63) is rotatably supported by the counter shaft (55), and the second clutch (68) is detachably engaged with the second eccentric gear (57). Provided integrally with
The first clutch (64) and the second clutch (68) are operated in conjunction with each other.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, it does not have any influence on description of a claim by this.

  According to the first aspect of the invention, in the transmission case interposed in the planting transmission device, the input rotation is transmitted through the non-constant speed transmission device at a non-uniform speed transmission and at a constant speed rotation. Since the transmission switching mechanism for switching to the transmission path and the brake mechanism acting on the non-uniform speed rotation are arranged, the configuration of the planting transmission device can be simplified and the configuration can be made compact. . In addition, the brake mechanism is linked to the transmission switching mechanism to switch to the non-operating state in the transmission state of constant speed rotation and to the operating state in the transmission state of inconstant speed rotation, so that switching of the brake mechanism becomes unnecessary. Incorrect operation can be eliminated.

In addition , since the input side shaft and the output side shaft of the transmission switching mechanism are arranged on one axis and separated from each other, a clutch for connecting / disconnecting power transmission via the inconstant speed gear train is provided. The configuration of the transmission switching mechanism can be simplified. Further, since the brake mechanism includes a cam interposed in the transmission path of the inconstant speed transmission device and a brake piece that is in sliding contact with the cam, the configuration of the brake mechanism can be simplified.

According to the invention of claim 2 , since the brake mechanism is provided integrally with the second clutch supported by the counter shaft, the brake mechanism can be made compact. Further, since the first clutch and the second clutch are operated in conjunction with each other, it is not necessary to operate each of the first clutch and the second clutch, and the operation burden on the driver is reduced.

The side view of the riding rice transplanter which concerns on this embodiment. The plan view. Fig. 3 is a development view of the transmission of the passenger rice transplanter. A development view of a planting transmission device. It is a side view which shows the inside of a transmission case, (a) shows the state at the time of constant-speed rotation transmission, (b) shows the state at the time of inconstant-speed rotation transmission, (c) is an upper enlarged view FIG. The front view which shows the inside of a transmission case. The side view which shows the stationary orbit of a planting nail | claw.

  Hereinafter, an embodiment of a riding rice transplanter as an example of a transplanter according to the present invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the passenger rice transplanter 1 (hereinafter simply referred to as “rice transplanter”) has a traveling machine body 5 supported by a pair of left and right front and rear wheels 2, 3. An engine (not shown), which is a power source, is mounted on the part and is covered with the bonnet 6, and a mission case 31 is disposed below the engine (see FIG. 3). A driving operation unit 12 including a steering handle 9, an operation panel 10, and a driver seat 11 is disposed behind the bonnet 6, and an elevating link mechanism 13 is provided behind the driving operation unit 12. A planting work machine 15 is connected to be movable up and down. In addition, a spare seedling transport device 7 for transporting seedlings is disposed on the side of the bonnet 6 and the driving operation unit 12.

  The planting work machine 15 includes a planting frame 20 that is movably connected to the elevating link mechanism 13, a seedling table 16 that is slidably supported in the left-right direction above the planting frame 20, and the seedling platform. A plurality of planting devices 17 for planting seedlings of the table 16 on the rice field, and a plurality of floats 21 supported at the bottom of the planting device 17 so as to be swingable in the vertical direction.

  As shown in FIGS. 3 and 4, the rotation of the engine is input to a transmission 30 (hereinafter referred to as a transmission) including an HST (hydrostatic continuously variable transmission) 32 and a plurality of transmission shafts 33 and 34. The speed change rotation is branched and transmitted to the planting transmission device 44 and the traveling transmission device 48 in the transmission case 31, and the rotation of the traveling transmission device 48 is transmitted to the traveling wheels 2 and 3 by the traveling transmission device 48. The rotation of the planting transmission device 44 is branched and transmitted to each of the planting devices 17 provided by the planting transmission device 44.

  As shown in FIG. 3, the traveling transmission device 48 includes a transmission shaft 36 that transmits the rotation from the transmission shaft 35, a differential mechanism 37 that transmits the rotation of the transmission shaft 36 to the left and right front wheels, and the differential mechanism 37. Left and right front axles 38, 39 that are linked via shafts 40, 41, a traveling PTO shaft 43 that transmits the rotation of the transmission shaft 36 to the left and right rear wheels 3, and the rear wheel 3 by the rotation of the traveling PTO shaft 43. And a rear axle 42 for driving the vehicle.

  The planting transmission device 44 includes an inter-plant transmission shaft 45 provided in the mission case 31, a planting PTO shaft 46 linked to the inter-plant transmission shaft 45 via a bevel gear, and an inter-plant transmission shaft 45 to the planting PTO shaft 46. A planting clutch 47 for connecting and disconnecting rotation from the transmission, as shown in FIG. 4, a transmission device 51 (see FIG. 5) in a transmission case 25 to which the rotation of the planting PTO shaft 46 is transmitted, and the transmission device A planting transmission shaft 23 that is linked to the output side of the planting transmission shaft 24 via a universal joint 24, and a power distribution shaft that is linked to the planting transmission shaft 23 via a universal joint 24 and a rotation drive member (not shown) in the input case 19. 22 and a planting device 17 in which the rotation of the power distribution shaft 22 is transmitted via a chain (not shown) in a plurality of planting transmission cases 18.

  The planting device 17 includes a rotary case 17a supported by the planting drive shaft 14, a planter arm 17b attached to both ends of the rotary case 17a, and a planting planting seedlings in the soil supported by the planter arm 17b. And a claw 17c.

  Next, the transmission case 25 interposed in the planting transmission device 44 will be described in detail. As shown in FIG. 4, the transmission case 25 is interposed between the planting PTO shaft 46 and the planting transmission shaft 23, and is disposed behind the mission case 31 (see FIG. 1). As shown in FIG. 5, the transmission case 25 has an outer shape that is substantially rectangular when viewed from the side, and has a two-part structure. Further, in the transmission case 25, a transmission path that outputs the rotation at an inconstant speed via the inconstant speed transmission device 51, a transmission path that outputs the rotation at a constant speed, and these constant speed and inconstant speed A transmission switching mechanism 62 that switches the transmission path between the brake mechanism 63 and a brake mechanism 63 that applies a braking force during non-uniform rotation is housed.

  As shown in FIG. 5, in the transmission case 25, an input side shaft (hereinafter referred to as an input shaft) 52, an output side shaft (hereinafter referred to as an output shaft) 53, and a counter shaft 55 are rotatably supported. Has been. The input shaft 52 and the output shaft 53 are disposed to face each other with a slight gap on one axis, and the counter shaft 55 is disposed in parallel to the input shaft 52 and the output shaft 53. A first eccentric gear 56 (non-constant speed gear) rotatably arranged on the input shaft 52 and a second eccentric gear 57 integrally connected to one end of the counter shaft 55 in the rotational direction and the axial direction. An eccentric gear train is formed by meshing with the (non-constant speed gear), and circular gears 60 and 61 integrally connected to the counter shaft 55 and the output shaft 53 in the rotational direction and the axial direction are meshed to form a circle. Gear trains are configured, and the inconstant speed transmission device 51 is configured by these gear trains.

  A first clutch 64 is slidably engaged with the tip spline portion of the input shaft 52 in the axial direction, and the first clutch 64 has dogs on both side surfaces thereof. The transmission path is switched by engaging one of the dogs formed on the side surfaces of the first eccentric gear 56 and the circular gear 61. The counter shaft 55 is supported by the counter shaft 55 so that the second clutch 68 can rotate and slide in the axial direction. The second clutch 68 has a dog on one side surface thereof. The dog can be detachably engaged with a dog formed on the side surface of the second eccentric gear 57. The first clutch 64 and the second clutch 68 constitute a transmission switching mechanism 62 composed of a clutch. The dogs of the clutches 64, 68 and the dogs of the gears 56, 57, 61 are configured so that the dogs mesh with each other at one location. By this meshing, the inconstant speed transmission device 51 is transmitted from the input shaft 52. Via the non-uniform speed rotation to the output shaft 53.

  The first clutch 64 and the second clutch 68 are operated and switched by the interlock operation mechanism 71 so as to slide integrally in the axial direction. With the first clutch 64 engaged with the circular gear 61 and the second clutch disengaged from the second eccentric gear 57, the rotation of the input shaft 52 is rotated via the first clutch 64 to the output shaft 53. In a state where the first clutch 64 is engaged with the first eccentric gear 56 and the second clutch 68 is engaged with the second eccentric gear 57. An inconstant speed transmission path is configured in which the rotation of the input shaft 52 is transmitted to the output shaft 53 via the eccentric gear trains 56 and 57 and the circular gear trains 60 and 61.

  As shown in FIGS. 5C and 6, the interlock operation mechanism 71 includes a shifter shaft 72 slidable in the front-rear direction on the upper side of the transmission case 25, and a shifter arm (shifter member) attached to the shifter shaft 72. 73 and a positioning mechanism 75 for fixing the shifter shaft 72. A recess 72 a formed at the end of the shifter shaft 72 is connected to the transmission switching lever 8 via a link mechanism 76, and the shifter arm 73 is formed in each of the first clutch 64 and the second clutch 68. The fitting parts 64a and 68a are fitted.

  The brake mechanism 63 includes an elliptical cam 66 formed integrally with the second clutch 68, and a brake piece 67 slidably contacting the cam 66 with a predetermined urging force. A shaft 65 that is rotatably supported by the transmission case 25 and extends through the case to the outside is integrally connected, and an arm 69 is integrally connected outside the case of the shaft 65. The arm 69 is connected to a spring 70 and applies a predetermined urging force to the brake piece 67. As shown in FIG. 7, the brake mechanism 63 applies a braking force when the planting claws 17c are at the braking start positions E and G in the high speed areas A and C, and the planting claws 17c are in the low speed areas B and D. When the braking force is released at the braking force release positions F and H, the action of the braking force is released.

  Next, the operation of the riding rice transplanter will be described. The engine rotation (constant speed rotation) is transmitted to the HST 32, and after being shifted by the HST 32, is transmitted to the transmission shafts 33 and 34. The rotation transmitted to the transmission shafts 33 and 34 is planted through the planting clutch 47 after being shifted between strains by meshing the gears 34 a and 45 a of the transmission shaft 34 and the stock shifting shaft 45 (see FIG. 3). It is transmitted to the PTO shaft 46 and transmitted from the planting PTO shaft 46 to the input shaft 52.

  An operator selects the planting work by non-uniform speed rotation, and operates the transmission switching lever 8 to the non-uniform speed rotation side. By this operation, the shifter shaft 72 and the shifter arm 73 are moved in the axial direction, and the first clutch 64 is slid on the input shaft 52 toward the first eccentric gear 56 as shown in FIG. The dog of the first clutch 64 is engaged with the dog of the first eccentric gear 56. The second clutch 68 is slid on the counter shaft 55 toward the second eccentric gear 57 side in conjunction with the first clutch 64 by the shifter arm 73, and the dog of the second clutch 68 is the second eccentric gear. The dog 66 is engaged, and the cam 66 rotates integrally.

  The rotation of the input shaft 52 is transmitted to the eccentric gear trains 56 and 57 via the first clutch 64, and the rotation is converted from constant speed rotation to non-constant speed rotation by the eccentric gear trains 56 and 57. And transmitted to the counter shaft 55. At this time, the inconstant speed rotation is also transmitted from the second eccentric gear 57 to the cam 66 via the second clutch 68. The urging force of the brake piece 67 slidably contacting the cam 66 becomes a resistance force that suppresses the rotation of the cam, and this resistance force is transmitted to the second eccentric gear 57 via the second clutch 68 to control the counter shaft 55. Acts as power.

  Unequal speed rotation of the counter shaft 55 is transmitted to the output shaft 53 via the circular gear trains 60 and 61. The rotation of the output shaft 53 is transmitted to the planting drive shaft 14 via the planting transmission shaft 23, the rotational drive member in the input case 19, the power distribution shaft 22, and the chain in the planting transmission case 18, and the rotary case. 17a rotates at a non-uniform speed, and the planting claw 17c scrapes off the seedling from the mat seedling while drawing the locus shown in FIG.

  An operator selects the planting work by constant speed rotation, and operates the transmission switching lever 8 to the constant speed rotation side. By this operation, the shifter shaft 72 and the shifter arm 73 are moved in the axial direction, and the first clutch 64 is slid on the input shaft 52 toward the circular gear 61 as shown in FIG. The dog of the clutch 64 is engaged with the dog of the circular gear 61. At this time, the second clutch 68 is slid on the counter shaft 55 to the circular gear 60 side in conjunction with the first clutch 64 by the shifter arm 73, and the dog of the second clutch 68 and the second eccentric gear. The engagement with the 57 dog is released.

  The rotation of the input shaft 52 is transmitted to the output shaft 53 connected via the first clutch 64 at a constant speed. At this time, the first eccentric gear 56 idles and rotation is not transmitted to the eccentric gear trains 56 and 57. The constant speed rotation transmitted to the output shaft 53 is transmitted to the planting device 17 through the same transmission path as when the non-constant speed rotation is transmitted, and the rotary case 17a rotates at a constant speed.

  As described above, in the transmission case 25 interposed in the planting transmission device 44, the input rotation is transmitted through the non-constant speed transmission device 51 at a non-constant speed rotation and at a constant speed rotation. Since the transmission switching mechanism 62 that switches to the transmission path and the brake mechanism 63 that acts on inconstant speed rotation are disposed, the configuration of the planting transmission device 44 can be simplified and the configuration can be made compact. Can do.

  In addition, the brake mechanism 63 is linked to the transmission switching mechanism 62 to switch to the non-operating state in the transmission state of constant speed rotation and to the operating state in the transmission state of non-constant speed rotation, so switching of the brake mechanism 63 is unnecessary. In addition, erroneous operations can be eliminated.

  In addition, since the input shaft 52 and the output shaft 53 of the transmission switching mechanism 62 are arranged on one axis and separated from each other, and a clutch for connecting / disconnecting power transmission via an inconstant speed gear train is provided, The configuration of the transmission switching mechanism 62 can be simplified. As a result, the structure of the transmission case 25 that houses the transmission switching mechanism 62 can be simplified. For example, the case that houses the transmission switching mechanism 62 has been divided into a two-divided structure. can do.

  In addition, the brake mechanism 63 includes the cam 66 interposed in the transmission path of the inconstant speed transmission device 51 and the brake piece 67 slidably contacting the cam 66, so that the configuration of the brake mechanism 63 can be simplified. it can.

  Further, since the cam 66 is provided integrally with the second clutch 68 supported by the counter shaft 55, the brake mechanism 63 can be made compact.

  In addition, since the first clutch 64 and the second clutch 68 are operated in conjunction with each other, the driver does not need to operate each of the first clutch and the second clutch, and the operation burden on the driver is reduced. become.

  By switching the second clutch 68, it is possible to switch between a brake applied state where the braking force by the brake mechanism 63 acts and a brake disengaged state where the braking force does not act, so that the planting device 17 is rotated at a constant speed and planted. When the work is performed, the planting work can be performed without applying the braking force of the brake mechanism 63, and the efficiency of the planting work can be improved.

  In addition, since the interlocking operation mechanism 71 that switches the second clutch in conjunction with the switching of the first clutch is provided in the transmission case 25, the second clutch is engaged with the circular gear 61 at the same time as the second clutch. The engagement between the clutch 68 and the second eccentric gear 57 is released. Thereby, it is possible to eliminate forgetting to turn off the brake at the time of planting work at constant speed rotation, and the working efficiency can be increased.

  In addition, since the shifter member included in the interlocking operation mechanism 71 is configured by the shifter arm 73 formed of a single plate, the manufacturing cost of the interlocking operation mechanism can be suppressed.

  Further, since the dogs are configured to mesh with each other at one place, there is no deviation in the acceleration / deceleration positions of the eccentric gears 56 and 57 with the switching of the transmission switching mechanism 62, so that a desired planting locus can be stably obtained. Can be obtained.

  In the present embodiment, the second clutch 68 and the second eccentric gear 57 are engaged to switch between the operating state and the non-operating state of the brake mechanism 63. The cam 66 is provided on the eccentric gear 57 or the circular gear 60 itself, and the brake piece 67 is moved to bring the cam 66 and the brake piece 67 into sliding contact with each other or released to switch the state of the brake mechanism 63. It is good also as a structure. In the case of such a configuration, the second clutch 68 is not required.

  In the above-described embodiment, the dogs are provided on both sides of the first clutch 64. However, the present invention is not limited to this. For example, the dog is provided only on the circular gear 61 side of the first clutch 64, and the first clutch 64 The eccentric gear 56 is connected to the input shaft 52 integrally, the second clutch 68 is connected to the counter shaft 55 so as to be slidably integrated in the rotation direction, and the second eccentric gear 57 is rotated to the counter shaft 55. The transmission path may be switched by the first clutch 64 and the second clutch 68 while being freely and slidably supported.

1 transplanter (riding rice transplanter)
2 Running wheel (front wheel)
3 Running wheel (rear wheel)
17 Planting device 25 Transmission case 30 Transmission device 44 Planting transmission device 48 Traveling transmission device 51 Unequal speed transmission device 52 Input side shaft 53 Output side shaft 55 Counter shaft 56 First eccentric gear 57 Second eccentricity Core gear 60 Circular gear 61 Circular gear 62 Transmission switching mechanism 63 Brake mechanism 64 First clutch 68 Second clutch

Claims (2)

A planting transmission that shifts the rotation of the power source with a transmission and then branches and transmits it to each planting; and a traveling transmission that transmits the rotation shifted by the transmission to the traveling wheels. In the transplant machine that
In the planting transmission device, a transmission case containing an inconstant speed transmission device that transmits rotation to the output side by rotating the shaft on the input side at an inconstant speed rotation is interposed,
A transmission switching mechanism for switching the transmission case to a transmission path through the inconstant speed transmission device and a transmission path for transmitting rotation of the input side shaft to the output side shaft at constant speed rotation;
In conjunction with the transmission switching mechanism, a brake mechanism is provided that is switched to a non-operating state in a state of transmitting constant speed rotation, and switched to an operating state in a state of transmitting inconstant speed rotation ,
The transmission path for transmitting the constant speed rotation is supported by the transmission case, and has the input side shaft and the output side shaft arranged on one axis and separated from each other,
The inconstant speed transmission device includes a counter shaft supported by the transmission case, and a gear train that transmits power from the input side shaft to the output side shaft via the counter shaft, and The gear train has a first eccentric gear and a second eccentric gear meshing with the first eccentric gear,
The transmission switching mechanism includes a first clutch that connects or disconnects the input-side shaft and the output-side shaft, and connects and disconnects power transmission via the gear train,
The brake mechanism includes a cam that is interposed in a transmission path of the inconstant speed transmission device, and a brake piece that is in sliding contact with the cam.
A transplanter characterized by that. The cam of the brake mechanism is rotatably supported by the counter shaft, and is provided integrally with a second clutch that is detachably engageable with the second eccentric gear;
The first clutch and the second clutch are operated in conjunction with each other;
The transplanter according to claim 1 .

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