JP2845834B2 - Continuously variable transmission in rice transplanter - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuously variable transmission for a rice transplanter. 2. Description of the Related Art As a prior art, a continuously variable transmission in which a clutch is provided on the input shaft side is disclosed in Japanese Utility Model Laid-Open Publication No. 61-171638. [0003] According to the conventional art described above, when the clutch is disengaged, the rotational power to the PTO shaft connected to the input shaft is cut off due to the balance between the clutch and the pulley. The problem described above occurs. Therefore, an object of the present invention is to provide a continuously variable transmission in which the rotational power to the PTO shaft is not cut off even when the clutch is disengaged. [0004] In order to achieve the above object, the present invention provides the following continuously variable transmission. That is, the engine is mounted in front of the fuselage,
In a rice transplanter having a transmission case disposed rearward and a continuously variable transmission case of a continuously variable transmission disposed between the engine and the transmission case, an input shaft through which power from an engine is transmitted into the continuously variable transmission case. And an output shaft for transmitting power to the transmission, and the other end of the input shaft is formed as a PTO shaft, and a clutch is provided near one end of the output shaft via a pulley. It is a continuously variable transmission in a rice transplanter. [0005] The other end of the input shaft is a PTO shaft and a clutch is provided on the output shaft side.
The rotational power of the TO shaft cannot be cut. An embodiment shown in the drawings will be described below.
First, as a whole description of the riding type rice transplanter, (1) in FIG. 9 indicates a riding body, and a planting section (3) is connected to a rear portion of the riding body (1) via a lift mechanism (2). .
An engine (5) is mounted on the body frame (4), and a front wheel (6) is provided below the engine (5). A transmission case (7) has a transmission case (8) from the left and right sides, and a rear wheel (9) at the rear end of the transmission case (8).
(10) is a driver's seat, (11) is a footrest, (12)
Is a steering wheel. The top link (13) and the lower link (14) of the link frame are attached to the lift mechanism (2), and the links (13) and (14) are swung by the expansion and contraction of the hydraulic cylinder, so that the planting portion ( 3) to go up and down. The planting section (3) consists of a seedling table (15), a float (16), and a transmission case (1).
7). (18) is a rotary case, and (19) is a planting arm. The transmission of the rice transplanter as described above will be described with reference to FIG.
0) and the pulley (22) is driven via the belt (21), the pulley (22a) is further driven via the pulley (20a) and the belt (21a), and the hydraulic pump (23) is driven. This hydraulic pump (23) sends hydraulic oil to the elevating part and the like of the planting part. Pulley (22) shaft (2
4) is also provided with a split pulley (25), from which the split pulley (27) is driven via a belt (26). The split pulley (27) is also connected to the shaft (2) by a gear mechanism in the transmission case (7) via the main clutch (28).
9) and (30) are driven. The shaft (30) indicates a planting drive shaft. Reference numeral (94) denotes a sliding gear operated by the main transmission lever (68), (98) denotes a reverse gear, and (99) denotes an inter-stock transmission gear. A gear (31) driven by a gear mechanism in the transmission case (7) has a propeller shaft (32).
To drive the differential gear mechanism (33), (3) in the differential case.
The front wheel (6) and the rear wheel (9) are driven via 4).
(35) shows a gear mechanism in a transmission case (8) for driving rear wheels, and (36) and (37) denote drive shafts for front wheels and rear wheels. (38) is a tension pulley of the belt (21), and (22) is a counter pulley. Next, a description will be given of a continuously variable transmission having an operation mechanism for moving the split pulley between the driving split pulley (25) and the driven split pulley (27). That is, in FIG. 5, reference numeral (39) denotes a continuously variable transmission case which is divided into two parts. The case (39) includes a drive shaft (input shaft) (40) and a driven shaft (output shaft) (41). And one of the drive shafts (40) is on the input side (42) and the other is on the PTO shaft side (43),
The PTO shaft can also be driven by a car wash pump. A split pulley (25) shown in FIG. 10 is mounted on the drive shaft (40), and a clutch (28) and a split pulley (27) shown in FIG. 10 are mounted on the driven shaft (41). Power is transmitted from the output shaft end to the mission (7). However, the clutch (28) is provided on the movable split pulley (27b) side. Then, the drive shaft (4
Further, between the driven shaft (41) and the driven shaft (41), speed change servo pulleys (44) and (45) are further suspended, and the pulley (44) has a larger diameter than the pulley (45). ,
The speed of the pulley (45) is increased. Also,
A bearing (47) is interposed between the transmission servo plate (46) having a boss screwed to the boss of the pulley (44) and the boss of the movable split pulley (25a).
The boss of 5a) is inserted into the boss of the pulley (44) for the variable speed servo, and can be moved in and out with a screw (48).
However, the movable split pulley (25a) is fitted to the shaft (40) by a spline (49). There are also brake plates (50) and (51) sandwiching the transmission servo plate (46), and one of the brake plates (50) is fixed to a rotary pulley (52), and the rotary pulley (52) is a bearing. It is externally fitted to a case (54) that can move left and right via (53). The other brake plate (51) is attached to the inner wall of the case (54) facing the brake plate (50) of the case (54). The case (54) is a switching shifter (55) that operates via the auxiliary speed change lever (75) with the planting elevating lever (74) of FIG.
Left and right. The aforementioned pulley (45) includes a pulley (56) integrally formed therewith, and a pulley (5).
6) has a larger diameter than the pulley (45), and drives the rotary pulley (52) by the timing belt (57). In addition, a spring (5) is provided between the outside of the clutch housing (58) and the movable split pulley (27b).
9) is stretched. The rotary pulley (52) and the corresponding pulley (56) have the same diameter. Further, (68) in FIG. 9 is a main shift lever, which operates the sliding gear (94) in FIG. 10 as described above. By operating the switching shifter (55) to bring the brake plate (50) into contact with the transmission servo plate (46), the pulley (52) pulls the pulleys (44) and (4).
5), (56), since the speed is increased through the timing belt (57), the speed is higher than that of the pulley (44), and therefore, the speed change servo plate (46) also increases along with the pulley (52). The pulley (44) with the screw (48) and the variable speed servo plate (4)
The movable split pulley (25a) is slowly moved from the low speed to the high speed by the natural return of the screw pitch from the rotation difference from 6). Next, the brake plate (51) is switched by the switching shifter (55).
Is brought into contact with the transmission servo plate (46), the brake plate (50) is separated from the transmission servo plate, and the case (54) is fixed after moving with respect to the transmission case (39). (51) fixes the transmission servo plate (46). The pulley (44) is still rotating despite the fixing of the transmission servo plate, so that the movable split pulley (25a) moves quickly from high speed to low speed due to the rotation difference. The stroke of the switching shifter (55) is regulated by applying it to a speed change case (39) as shown in FIG. FIG. 6 shows the transmission servo plate (46).
(A), there is a fan hole (60) as shown in FIG. 6 (B) to remove frictional heat between the brake plate and the fan.
In addition, (61) is the output shaft (4) of the transmission case (39).
1) A separate boss provided at the end, where the shaft (29) in FIG.
Are coupled to the output shaft (41). In FIGS. 7 and 8, when the clutch petal (62) is depressed, the clutch arm (64) is operated via the rod (63), and the clutch (28) is disengaged via the clutch shaft (41a). The detent release member of the planting elevating lever (74) of FIG. 1 is moved in the release direction from the clutch arm (64) via the wire (65). The stepped transmission is switched to a low speed side. From the above, the continuously variable transmission can be switched to the low speed side in conjunction with the operation of the main clutch, so that the vehicle can always start smoothly at a low speed, and the seedling collapse at the time of starting,
Engine stalls can be eliminated. Also, the wire (67) is connected to the wire (65) via the connecting plate (66).
, And the seedling clutch lever can also be operated. Therefore, when the nursery clutch lever is operated, the main clutch (28) is turned off, and both the traveling and planting of the rice transplanter can be turned off at once. When it is necessary to turn off the attachment drive, they can be turned off at once without operating each individually. In FIG. 1, a lever (78) of the high / low speed switching shifter (55) is provided with a spring (77 ') at a connection point (79), and a rod (7) at the upper end thereof.
6) is pivotally supported (77) by a metal fitting of the auxiliary transmission lever (75). A spring (8) having one end fixed to the frame is provided at the upper end of the lever (78) pivotally supported by (97).
0) is attached, and this constitutes an auxiliary member. The auxiliary transmission lever (75) is pivotally supported (85) together with the planting elevating lever (74) on the bracket (86), and as a whole, as shown in FIG.
The bent portion (75a) can be engaged with 4). The fan-shaped plate (95) swinging with the planting elevating lever (74) has a high speed H, a low speed L, a descent D, a neutral N, and an ascent U
P has a plurality of grooves (84), and the rollers (10
A base end of a link lever (81) having 1) is pivotally supported by a frame fitting (91), and a spring (100) fixed to the frame is connected to the other end (90). An arm (82) is fixed to the link lever (81).
The wire (65) operated by the main clutch petal (62) is connected to the metal fitting (83) of (2). The pin (96) of the planting elevating lever (74) also has a spring wire (8) between the pin and the frame support (88).
7) are connected. When the planting raising / lowering lever (74) is moved from the low planting position to the high planting position in FIG. 1, the sub-transmission lever (75) remains engaged at the bent portion to the right in the figure. (See FIG. 2), the lever (78) is rotated rightward via the rod (76) and the spring (77 '), and the shifter (55) is used to move the continuously variable transmission from low speed. Move to the high speed side. In this case, since the spring (80) is acting on the lever (78), the auxiliary transmission lever (7
5) The planting elevating lever (74) can be operated slowly, and a smooth planting operation can be performed. Next, when it is desired to switch the continuously variable transmission from a high speed to a low speed, the auxiliary transmission lever (75) is rotated to the left in FIG. 2 by the spring (77 ') together with the planting elevating lever (74). Then, the lever (78) is rapidly rotated leftward by the elastic force of the spring (80), and the shifter (55) is switched from high speed to low speed. Next, when the shifter (55) is on the high-speed side and high-speed planting is performed, the main clutch petal (62)
When the arm is depressed, the arm (82) rotates in the direction of the arrow shown in FIG.
4), the fan-shaped plate (95) is free, and the planting elevating lever (74) is also free. At (80), the shift is automatically made to follow, and the shifter (55) also moves the continuously variable transmission from a high speed to a low speed in the same manner as described above. At that time, it is operated quickly by the force of the spring (80) and moves to the low speed side.
Due to the working length of the rod (76), the auxiliary transmission lever (75) stops at the low speed position. Then, when the operation of the main clutch petal stops, the link lever (81) is restored by the spring (100), and the roller (101) is fitted into the low-speed groove (84) to prepare for the next start. Become. The planting elevating lever (74) moves along the guide groove (93) of the guide plate (92) shown in FIG. 4, but when the seedling joining clutch lever is operated, the main clutch (28) is moved. At the same time, the day tent mechanism is released and the planting elevating lever (74) is moved to the neutral position by the spring wire (87) and stopped. OFF
Becomes In this case, the auxiliary transmission lever (75) stops at the low speed position as described above, and thereafter separates from the planting elevating lever (74), and the planting elevating lever (74) is moved to the neutral position by the spring wire (87). It turns to the stop position. The main shift lever (68) is operated by moving a sliding gear (94) shown in FIG. 10 in the gear transmission (7) to perform H and L shifts, and the sub shift lever (75) in the continuously variable transmission. ) Also performs H and L shifts, but during traveling, the auxiliary shift lever (75) is set to L, and the main shift lever (6).
8) is at the H position, and at the time of planting, the sub-transmission lever (75)
To the H or L position and the main shift lever (6
8) is advanced at the forward position at the third speed in the L position. The distance α1 from the pivot point (89) of the link lever (81) to the roller (101) and the distance α2 from the pivot point (89) to each groove (84) (in the case of high speed, shown).
The link ratio becomes higher toward the L → H side, so that the operation of the planting elevating lever (74) toward the high speed side cannot be operated lightly. According to the present invention, in the continuously variable transmission as described above, the other end (43) of the input shaft (drive shaft) (40) to which the power from the engine (5) is transmitted is formed as a PTO shaft. A clutch (28) is provided via a pulley near one end of one of output shafts (driven shafts) (41) for transmitting power to the transmission (7) (shown in the front of the fuselage). Things. As described above, when the clutch (28) is provided on the output shaft (41) side, even if the clutch (28) is disengaged, the rotational power to the PTO shaft (43) is not cut off, and the PTO shaft (43) is independently driven. It is effective when you want to use it. Further, since the output shaft (41) as the variable output portion and the PTO shaft (43) as the direct output portion are located in the same direction with respect to the continuously variable transmission case (39), the layout after the engine is simplified. Become. In any case, with the above configuration, the power from the engine is directly output to the output unit (P
TO shaft) can be driven,
The car wash pump and the like can be driven irrespective of the turning off, and the traveling speed can be continuously changed by the variable output unit (output shaft). According to the present invention, the other end of the input shaft to which the power from the engine is transmitted is used as the PTO shaft, and the clutch is provided on the output shaft side for transmitting the power to the transmission. Even if the power is turned off, the rotational power to the PTO shaft is not
This is effective when it is desired to use the O axis independently.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of the operation of a link mechanism. FIG. 2 is an explanatory view of an operation of a link mechanism. FIG. 3 is a side view of the link mechanism. FIG. 5 is a sectional view of the continuously variable transmission. FIG. 6 is a plan view of the transmission servo plate, a cutaway view of the transmission servo plate, and a partial view of the switching shifter stroke regulating device. 7: Plan view of the continuously variable transmission case [FIG. 8] Partially cut front view of the continuously variable transmission case [FIG. 9] Front view of the rice transplanter [FIG. 10] Transmission mechanism diagram [Description of symbols] 5 Engine 7 Transmission 25% Pulley 27 Split pulley 28 Clutch 39 Stepless transmission case 40 Drive shaft (input shaft) 41 Driven shaft (output shaft) 44 Pulley 45 Pulley 46 Transmission servo plate 52 Pulley 55 Switching shifter 56 Pulley 65 Wire 74 Planting elevating lever 75 Shift lever 76 rod 77 'spring 78 the lever 80 the spring 81 links lever 95 sector plate

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-67633 (JP, A) JP-A-62-238173 (JP, A) Fully open Showa 61-171638 (JP, U) Really open show 58- 72552 (JP, U) Japanese Utility Model Showa 57-8240 (JP, U) Japanese Utility Model Showa 58-7532 (JP, U) Japanese Patent Publication No. 44-1322 (JP, B1) Japanese Utility Model Showa 49-13448 (JP, Y1) (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 9/00-9/26 A01C 11/02 313 B60K 17/28 B60K 17/08

Claims (1)

(57) [Claims] An engine mounted to the front body, a transmission case disposed behind, in the rice transplanters which were provided with stepless case of the continuously variable transmission between the engine and the transmission case, from the engine to the continuously variable case The power transmitted
An input shaft and an output shaft for transmitting power to the transmission are mounted on a shaft, the other end of the input shaft is configured as a PTO shaft, and a clutch is connected via a pulley near one end of the output shaft. A continuously variable transmission in a rice transplanter, wherein the transmission is provided.