JP3131120B2 - Riding transplanter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a riding transplanter such as a rice transplanter capable of operating a continuously variable transmission and a forward / reverse switching device with the same transmission lever.

[0002]

2. Description of the Related Art In general,
This type of riding transplanter has a continuously variable transmission that continuously changes the running power and the planting power, and a forward / reverse switching device that switches the running power between forward and reverse. There is. However, in the conventional one,
Although the continuously variable transmission can be operated with a so-called no clutch, it is still necessary to intermittently operate the main clutch when operating the forward / reverse switching device or when completely cutting off the running power such as when supplying seedlings. Therefore, frequent operation of the clutch pedal is required in the work of repeating forward and backward movement, and the operability is inferior.In addition, when replenishing seedlings, it is necessary to maintain the main clutch in the disconnected state, so the clutch pedal is moved to the disconnected position. A lock mechanism for locking is required, and as a result, there has been an inconvenience of increasing the number of parts and complicating the operation.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has been devised with the object of providing a riding transplanter which can solve these problems. A speed change lever operable to a forward speed change operation region and a reverse speed change operation region via an operation region, and a continuously variable speed that continuously changes running power based on lever operation in the forward speed change operation region and the reverse speed change operation region. A riding transplanter including a transmission, a forward / reverse switching device that switches forward / reverse the traveling power based on a lever operation in the forward / reverse switching operation region, and a main clutch that interrupts the traveling power based on an operation of a clutch pedal. An actuator capable of intermittently operating the main clutch, and disengaging the actuator in the forward / reverse switching operation region of the shift lever. It is characterized in the provision of the actuator actuation mechanism for actuating the side. The present invention improves the operability by eliminating the need for a clutch pedal operation during forward / reverse switching operation and when supplying seedlings, and simplifies the structure by eliminating the need for a mechanism for locking the clutch pedal in the disengagement position. In addition, the number of parts can be reduced.

[0004]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a traveling body of a riding rice transplanter. The traveling body 1 includes a body frame 2, an engine 3 mounted on a front portion of the body frame 2, and a belt-type continuously variable transmission. A transmission case 5 for inputting through the device 4; a front axle case 6 integrally provided on the left and right sides of the transmission case 5; a front wheel 7 pivotally supported on the left and right sides of the front axle case 6; The rear axle case 8 is mounted on the rear axle case 8, the rear wheel 9 is pivotally supported on both left and right sides of the rear axle case 8, and a power steering mechanism for steering the front wheel 7 via a torque generator 10. A planting section 12 is connected to a rear portion of the traveling body 1 via an elevating link mechanism 11. In the present embodiment, the planting posture (ground height posture) of the planting section 12 is set to a center float. 13 based on the vertical movement of
This is fed back to a control valve (not shown) of the lifting hydraulic cylinder 14 to automatically control the planting posture of the planting section 12.

[0005] Reference numeral 15 denotes a speed change lever provided on an operation portion 16 of the traveling machine body 1. A first plate 17 fixed to a base end portion of the speed change lever 15 has a first boss portion facing forward and backward. The first boss portion 18 is fitted to the first support shaft 19 to enable the left and right swing operation of the transmission lever 15, and the first boss portion 18 is further fixed to the support shaft 19. A second boss 21 facing the left and right direction is fixed to the two plates 20, and the second boss 21 is fitted to a second support shaft 23 protruding from a lever bracket 22, and It allows for rocking back and forth.

Reference numeral 24 denotes a guide plate disposed below the second support shaft 23 to guide the operation of the transmission lever 15. The guide plate 24 projects from the first plate 17. The guide pin 25 is guided by a substantially U-shaped guide groove. When the shift lever 15 is operated along the forward / reverse switching operation area 24a facing the left / right direction, the forward / backward movement in the transmission case 5 is performed via the forward / backward switching shifter shaft 26 with which the guide pin 25 is engaged. When the switching mechanism (not shown) is operated for switching, while the shift lever 15 is operated along the forward shift operation area 24b and the reverse shift operation area 24c extending in the front-rear direction from the left and right ends of the forward-reverse switching operation area 24a. A speed change arm 27 protruding from the second boss portion 21 causes the continuously variable transmission 4 to perform a speed change operation via a speed change rod 28.

Reference numeral 29 denotes a fan-shaped cam plate provided integrally with the second boss portion 21. A roller 31 provided on a swing arm 30 is provided on a tip end surface of the cam plate 29 with an elastic machine 32. Under the urging force of the contact. That is, the roller 3 is provided on the tip end surface of the cam plate 29.
Since a plurality of cam grooves 29a into which 1 is fitted are formed, it is possible to hold (position) the transmission lever 15 at the corresponding positions (H, M, L, SL, N) of the cam grooves 29a. In the present embodiment, a lever holding mechanism including the cam plate 29, the swing arm 30, the roller 31, and the bullet 32 is arranged side by side at a predetermined interval, and
Since the plurality of cam grooves 29a are alternately formed on the left and right cam plates 29, the position of the speed change lever 15 can be finely maintained without particularly extending the operation stroke of the speed change lever 15, and Since the rollers 31 are alternately fitted into the cam grooves 29a, the overcoming force of the rollers 31 is balanced on the left and right, so that a smooth lever operation can be performed.

On the other hand, reference numeral 33 denotes a pedal shaft which is supported on the lower part of the floor surface of the operation unit 16 in a left-right direction, and a base boss portion of a clutch pedal 34 is integrally formed on the left end of the pedal shaft 33. On the other hand, at the right end of the pedal shaft 33,
A first connection plate 37 connected to the clutch operation lever 36 via the clutch rod 35 is integrally welded. Therefore, when the pedal shaft 33 rotates with the operation of the clutch pedal 34, the first connecting plate 37
Pulls the clutch operation lever 36 to operate the main clutch 38 in the transmission case 5 to the disengagement side. However, the connection hole 3 of the first connection plate 37 to which the base hook portion 35a of the clutch rod 35 is connected.
7a is formed in an arc-shaped long hole (through hole) centered on the pedal shaft 33, so that even when the main clutch 38 is operated through another operation path, the clutch pedal 34 is interlocked. It can be prevented.

Reference numeral 39 denotes a second connecting plate rotatably supported by the right end of the pedal shaft 33. At a position in front of the fulcrum of the second connecting plate 39, the clutch rod 35 is interposed via a plate 35b. Connecting pin 35 protruding
On the other hand, the clutch hydraulic cylinder 40 (single-rod single-acting cylinder) is connected to a position behind the fulcrum. That is, when the clutch hydraulic cylinder 4 is extended, the second connection plate 39 pulls the clutch operation lever 36 to operate the main clutch 38 to the disengagement side, but the connection pin 35c is connected. Since the connecting hole 39a of the second connecting plate 39 is formed as an arc-shaped long hole (flexible hole) centered on the pedal shaft 33, the clutch operation by the clutch pedal 34 is always allowed. .

The clutch hydraulic cylinder 4
Numeral 0 is disposed behind the transmission case 5 and near the side of the body frame 2. That is, in order to protect the clutch hydraulic cylinder 40 using the transmission case 5 and the body frame 2,
The clutch hydraulic cylinder 40 can be effectively prevented from contacting an obstacle.

Reference numeral 41 denotes a hydraulic valve for switching the operation of the clutch hydraulic cylinder 40.
Has a pump port P, a tank port T, and a cylinder port C, and has a spool 42 which is displaced to three positions of extension, neutral, and contraction.
2 is urged to the reduction position side by the bullet 42a. In the state where the spool 42 is located at the contraction position, the cylinder port C and the tank port T communicate with each other to reduce the clutch hydraulic cylinder 40, and when the spool 42 is pulled out to the extension position,
The pump port P and the cylinder port C communicate with each other to extend the clutch hydraulic cylinder 40, and further, in the intermediate position, close the oil discharge path of the cylinder port C and maintain the clutch hydraulic cylinder 40 in a stopped state. However, since the throttle 41a is provided in the oil drain path from the cylinder port C to the tank port T, the operating speed at the time of contraction is set to be slower than the operating speed at the time of extension. That is, while the disconnecting operation of the main clutch 38 is performed promptly, the connecting operation is performed slowly irrespective of the operating speed of the hydraulic valve 41, so that the shock at the time of connecting the clutch can be relieved and inconvenience such as sudden start can be prevented. It has become.

Reference numeral 43 denotes a spool 42 of the hydraulic valve 41.
A connecting rod connected to the connecting rod 43
Is configured to be extendable and retractable, and is normally urged toward the reduction side by an elastic machine 44.
The transmission lever 43 is inserted into the elongated connecting hole 43a formed at the front end side of the transmission lever without a link mechanism or a connecting wire.
The fifth second boss portions 21 are directly connected. That is, the connecting rod 43 is connected to the speed change arm 27 integrally projecting from the second boss portion 21 using the connecting pin 28a of the speed change rod 28. When the shift lever 15 is operated in the traveling shift range “H to SL” in the forward and reverse shift operation areas 24b and 24c, the connecting pin 28a moves in the connecting hole 43a, so that the spool 42 of the hydraulic valve 41 is moved. Maintains the reduced position, but shifts the shift lever 15 forward and reverse shift operation areas 24b, 2b.
4c, the transmission arm 27 pulls the transmission rod 28 forward to displace the spool 42 to the extended position, so that the clutch hydraulic cylinder 40 is extended, When the shift lever 15 is again operated from the non-traveling speed range “SL-N” to the traveling speed range “H-SL”, the
The spool 42 returns to the contracted position by the urging force, so that the clutch hydraulic cylinder 40 in the extended state is contracted. Therefore, the non-traveling speed ranges “SL to N” in the forward and reverse speed change operation regions 24b and 24c.
Also, in the forward / reverse switching operation area 24a, the main clutch 38 is automatically operated to the disengagement side in conjunction with the operation of the shift lever 15, and as a result, when the forward / reverse switching operation is performed, The operability can be improved by eliminating the need for clutch pedal operation when the traveling power and the planting power are completely disconnected as in the case of the conventional art.

Reference numeral 45 denotes a neutral return lever provided on the spool projecting surface of the hydraulic valve 41 so as to be swingable.
The front end of the neutral return lever 45 is in contact with the connecting pin 46 connecting the spool 42 and the connecting rod 43 from the front side. The hydraulic cylinder 40 is connected to the rod tip. That is, when the clutch hydraulic cylinder 40 is extended in accordance with the above-described shift lever operation, the clutch hydraulic cylinder 40 pulls the feedback wire 47 near the most extended position. The spool 42 is forcibly pushed down to the neutral position against the pressure, and as a result, the clutch hydraulic cylinder 40 can be maintained in the extended state without causing a relief state. If a pressure oil leak (leakage) occurs,
Although the clutch hydraulic cylinder 40 tries to shrink unexpectedly, if the clutch hydraulic cylinder 40 shrinks based on a hydraulic leak, the connecting rod 43 Since the spool 42 is pulled out to the extension side by the urging force, the clutch hydraulic cylinder 40 can be maintained in the extension state regardless of the occurrence of the hydraulic leak.

Reference numerals 48 and 49 denote first and second hydraulic pumps which perform discharge operation by the power of the engine 3, and the first hydraulic pump 48 is a hydraulic circuit for planting control including the hydraulic cylinder 14 for raising and lowering. The second hydraulic pump 49 supplies hydraulic oil to a hydraulic circuit for power steering including the torque generator 10, and the hydraulic hydraulic circuit for power steering includes the hydraulic cylinder for clutch 40 ( The hydraulic valves 41) are connected in series. That is, in order to operate the clutch hydraulic cylinder 40 using a power steering hydraulic circuit configured independently of the planting control hydraulic circuit, the lifting hydraulic cylinder 14 connected to the planting control hydraulic circuit is used. The main clutch 38 can be intermittently operated without affecting the operation of the main clutch 38.

The transmission case 5 transmits the engine power input to the input shaft 50 via the continuously variable transmission 4 through the main clutch 38 provided on the input shaft 50, and then changes the planting speed. First and second planting transmission shafts 52 and 53 that are transmission-connected via a mechanism 51;
While transmitting to the planting output shaft 55 via a torque limiter 54 provided at one end of the second planting transmission shaft 53, a planting clutch mechanism 56 provided on the planting output shaft 55, and the like,
First and second traveling transmission shafts 57 and 58 that are transmission-coupled via a traveling transmission mechanism 56, and a third traveling transmission shaft 6 that is transmission-coupled via a ring gear 59a of a differential device 59 described later.
0, etc., to the rear wheel output shaft 61, but the power input to the ring gear 59a of the differential device 59 is further distributed and output from the left and right output shafts 62L, 62R of the differential device 59. The power is transmitted to the left and right front wheels 7.

Reference numeral 63 denotes a transmission clutch mechanism interposed between the second traveling transmission shaft 58 and one output shaft 62R of the differential device 59. The transmission clutch mechanism 63 is connected to the right output shaft 62R. A pair of transmission gears 66, 67 which are rotatably supported at predetermined intervals and always mesh with transmission gears 64, 65 on the second traveling transmission shaft 58 side, and a right side between the transmission gears 66, 67 A meshing claw 68 that is spline-fitted to the output shaft 62R and can selectively mesh with meshing claws 66a, 67a formed on opposing surfaces of the transmission gears 66, 67.
a on both left and right sides of the transmission gear 66.
The reduction gear ratio of the other transmission gear 67 is set smaller than the reduction gear ratio of the ring gear 59a.
It is set larger than the reduction ratio of a. That is, the transmission clutch mechanism 63 is configured to forcibly increase or decrease the rotational speed of the right output shaft 62R based on a selective engagement operation of the pawl clutch 68 with the pair of transmission gears 66, 67. When the speed of the right output shaft 62R is increased, the left output shaft 62L is decelerated based on the operation of the differential device 59, so that a constant rotation difference corresponding to the left turn between the left and right output shafts 62L and 62R. When the right output shaft 62R is decelerated while the right output shaft 62R is decelerated, the left output shaft 62L is accelerated by the operation of the differential device 59, so that the right turn is made between the left and right output shafts 62L and 62R. , A constant rotation difference corresponding to the rotation speed can be forcibly generated.

Reference numeral 69 denotes a shifter mechanism for shifting the transmission clutch mechanism 63. The operation arm 70 of the shifter mechanism 69 has an operation rod 72 attached to a pitman arm 71 that rotates left and right based on the operation of the power steering mechanism. Are interlocked and linked. For this reason, the transmission clutch mechanism 63 is automatically operated to shift gears in conjunction with the turning operation of the machine body. However, the shifter mechanism 69 of this embodiment is provided with the transmission case 5 so as to be arranged below the front axle case 6. It protrudes from one side. That is, although the transmission clutch mechanism 63 is configured outside the transmission case 5, it is disposed almost directly above the front wheel axle in a side view, that is, at a position where the ground distance hardly changes. Since there is no contact with an object and the upper part is protected by the front axle case 6, breakage due to a falling object can be prevented.

The output chamber 5a of the transmission case 5, which supports the planted output shaft 55, is separated by the front and rear bearings 73 and does not receive the scattering of transmission oil, so that a breather hole (a breathing hole) is formed. Although used as a room, in this embodiment, a breather path (external communication path) is formed without using a dedicated breather plug. That is, the bolt hole 5b through which the mating bolt 74 of the transmission case 5 passes communicates with the output chamber 5a, and the breather groove 5c is formed along the bolt hole 5b so that the output chamber 5a communicates with the outside. I have.

Reference numeral 75 denotes escape auxiliary blades which can be mounted on the rear wheel 9. The auxiliary blades 75 are left and right end portions of an auxiliary blade main body 75 a which can be fitted between the blade portions 9 a of the rear wheel 9. Further, a mounting portion 75b having a zigzag cross section to be fitted to the rim portion 9b of the rear wheel 9 is welded. That is, when the rear wheel 9 is fitted into a groove such as a culvert, the auxiliary blade main body 75a is fitted between the blade portions 9a of the rear wheel 9, and the rim portion 9 of the rear wheel 9 is fitted.
After the auxiliary blade 75 is mounted in the position where the mounting portion 75b fits into the mounting portion 75b, the bolts 75c penetrate the mounting portion 75b to the left and right to prevent it from coming off. In this state, the auxiliary blade 75
However, if the rear wheel 9 is rotated as it is, the auxiliary blades 75 can contact the groove edges to lift the airframe, but the auxiliary blades 75
Since it is mounted on the rim portion 9b of the rear wheel 9, it can be mounted even when the rear wheel 9 is half or more buried. In addition, since the mounting portions 75b are provided on both left and right sides, the left and right rear wheels 9 are inverted. The auxiliary blade main body 75a is integrated with the blade portion 9a of the rear wheel 9 and thus has excellent strength. Reference numeral 75d denotes a fitting hole that fits into the lug portion 9c and restricts lateral displacement and rotation of the auxiliary blade 75.

In the embodiment of the present invention configured as described above, when the shift lever 15 is operated in the left-right direction along the forward-reverse switching operation area 24a, the forward-reverse switching mechanism in the transmission case 5 switches. On the other hand, when operated in the front-rear direction along the forward speed change operation area 24b and the reverse speed change operation area 24c, the continuously variable transmission 4 performs a speed change operation.
Then, the hydraulic valve 41 interlocked with the shift lever 15
Is switched to extend the clutch hydraulic cylinder 40, so that the main clutch 3 in the transmission case 5
8 will be activated to the cutting side. Therefore, when the forward / backward switching operation is performed, or when the running power and the planting power are completely cut off, such as when supplying seedlings, it is not necessary to particularly operate the clutch pedal 34. As a result, the operation is simplified and the operation is simplified. Labor can be reduced.

Further, in the forward / reverse switching operation area 24a of the speed change lever 15, the main clutch 38 is maintained in the disengaged state.
As a result, it is not necessary to lock the lock in the cutting position, so that the lock mechanism is not required, so that the structure can be simplified and the number of parts can be reduced. Further, the lock operation is not required, and the operability can be further improved. it can.

Further, a long hole (connection hole 37a) for allowing the operation of the main clutch 38 by the clutch hydraulic cylinder 40 is provided in a pedal operation path from the clutch pedal 34 to the main clutch 38, and the clutch hydraulic cylinder 40 A long hole (connection hole 39 a) that allows the operation of the main clutch 38 by the clutch pedal 34 is provided in the cylinder operation path from to the main clutch 38, so that the clutch pedal 34 is interlocked with the operation of the clutch hydraulic cylinder 40. It is possible to maintain good operability while avoiding such inconveniences or avoiding inconveniences affecting the operating force of the clutch pedal 34.

[0023]

In summary, since the present invention is constructed as described above, the continuously variable transmission for continuously changing the traveling power and the forward / reverse switching device for switching the traveling power between forward and reverse are the same. Although the operation is performed by the shift lever, an actuator capable of intermittently operating the main clutch is provided, and when the shift lever is operated in the forward / reverse switching operation area, the actuator is operated to the clutch disengagement side. The operability can be improved by eliminating the need for clutch pedal operation when switching operation or when running power is completely cut off, such as when supplying seedlings. Moreover,
Since the main clutch can be maintained in the disengaged state only by the operation of the shift lever, a mechanism for locking the clutch pedal in the disengaged position is not required, so that the structure can be simplified and the number of parts can be reduced. The operability can be further improved by eliminating the need for the lock operation.

In addition, a first accommodation mechanism that allows the main clutch to be operated by the actuator is provided in a first clutch operation path from the clutch pedal to the main clutch, and a second clutch operation path from the actuator to the main clutch is provided in the first clutch operation path. When a second accommodation mechanism that allows the main clutch operation by the clutch pedal is provided,
It is possible to eliminate the disadvantage that the clutch pedal is interlocked with the operation of the main clutch by the actuator, or it is possible to maintain good operability by avoiding affecting the other operating force.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a plan view of the same.

FIG. 3 is a side view showing a connection structure of a transmission lever.

FIG. 4 is a schematic side view of the same.

FIG. 5 is a rear view of the same.

FIG. 6 is a plan view of a lever guide.

FIG. 7 is a side view of the cam plate.

FIG. 8 is a plan view showing an operation path of a main clutch.

FIG. 9 is a plan view of a main part of the same.

FIG. 10 is a side view of the essential parts of the same.

FIG. 11 is a side view of the same main part showing movement when a clutch pedal is operated.

FIG. 12 is a side view of the essential parts of the same, showing the movement when the clutch cylinder operates.

FIG. 13 is a plan view showing a connection structure between a shift lever and a hydraulic valve.

FIG. 14 is a side view of the hydraulic valve.

FIG. 15 is a front view of the same.

FIG. 16 is a cross-sectional view of the switching valve showing a cylinder contracted state.

FIG. 17 is a sectional view of the same, showing a neutral state.

FIG. 18 is a sectional view showing the same state in which the cylinder is extended.

FIG. 19 is a hydraulic circuit diagram showing a hydraulic circuit for power steering.

FIG. 20 is a side view of a transmission case.

FIG. 21 is a rear view of the same.

FIG. 22 is a developed sectional view of the same.

FIG. 23 is a sectional view of a main part of the above.

FIG. 24 is a side view showing a connection state between the transmission clutch mechanism and the steering mechanism.

FIG. 25 is a bottom view of the same.

FIG. 26 is a side view of the rear wheel showing a mounting state of the auxiliary blade.

FIG. 27 is a plan view of the same.

FIG. 28 is an operation explanatory view of an auxiliary blade.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 traveling body 2 body frame 4 stepless transmission 5 transmission case 15 shift lever 18 first boss 21 second boss 34 clutch pedal 38 main clutch 40 clutch hydraulic cylinder 41 hydraulic valve 42 spool 43 connecting rod 47 feedback wire 48 First hydraulic pump 49 Second hydraulic pump

Claims (2)

(57) [Claims] A shift lever operable through a forward / reverse switching operation area to a forward shift operation area and a reverse shift operation area, and running power based on lever operation in the forward shift operation area and the reverse shift operation area. Continuously variable transmission that continuously changes the speed of the vehicle, a forward / reverse switching device that switches the traveling power between forward and reverse based on a lever operation in the forward / reverse switching operation area, and intermits the traveling power based on the operation of a clutch pedal. What is claimed is: 1. A passenger transplanter including a main clutch, comprising: an actuator capable of intermittently operating the main clutch; and an actuator operating mechanism for operating the actuator to a clutch disengagement side in a forward / reverse switching operation region of a shift lever. A passenger transplanter characterized by comprising: 2. A first clutch operation path from a clutch pedal to a main clutch, wherein a first accommodation mechanism for permitting operation of the main clutch by the actuator is provided in the first clutch operation path from the clutch pedal to the main clutch. A passenger transplanting machine, characterized in that a second accommodation mechanism that allows a main clutch operation by a clutch pedal is interposed in a clutch operation path.