JP3435499B2 - Transmission operating device for cultivator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cultivator capable of performing a traveling shift and a tilling shift with a single shift lever. 2. Description of the Related Art Japanese Patent Application Laid-Open No. 4-16642 discloses a conventional gear shift lever in which a traveling shift and a tilling shift can be performed with a single shift lever so that the tilling speed can be rotated forward and backward in one step.
No. 4, JP-A-62-234736 and JP-A-62-191232. [0003] In general, when a main transmission lever for traveling and a cultivation transmission lever for rotary are separately provided in a cultivator, operation of the cultivator becomes troublesome and the apparatus becomes complicated, resulting in compactness. And hinder cost reduction. In order to solve the above-mentioned drawbacks, it is disclosed in Japanese Patent Application Laid-Open No. HEI 4-166424 that a single shift lever can be used to operate the running and the rotary. Since the switching was performed, there was a problem in that dashing was performed.
In addition, since the working speed cannot be adapted to the tilling work, there is a drawback that it cannot cope with the condition of the field.
An object of the present invention is to provide a safe cultivator having a simple structure, a low cost and a good operability that can be adapted to a tilling operation and can cope with a field condition. SUMMARY OF THE INVENTION The present invention provides the following cultivator to achieve the above object. That is, in a cultivator capable of performing a traveling shift and a tilling shift with one swingable shift lever, the shift lever is engaged with a shift operation fork shaft capable of obtaining a plurality of working speeds. When the gearshift lever engages the rotary fork shaft with the clutch engagement side, and when the gearshift lever engages with the on-road traveling speed and reverse operation fork shaft, the gearshift lever operates the interlock mechanism that switches the rotary fork shaft to the clutch disengagement side. The interlocking mechanism is provided between the shaft support portion and the rotary fork shaft, and the interlocking mechanism includes a swingable plate fixed to the shaft support portion of the speed change lever, and a rotatable plate having one end engaged with an engagement groove of the plate. A transmission operating device for a tilling machine, comprising an L-shaped member and a U-shaped member that allows a rotary fork shaft fixed to the other end of the L-shaped member to enter and exit. [0005] By rotating the rotary fork shaft by the up and down movement of the speed change lever, the rotary clutch can be turned on and off so that a plurality of tillage steps can be performed with one lever. Can rotate forward and reverse, thereby preventing dashing. First, running and rotary operation can be operated with a single shift lever disclosed in Japanese Patent Application Laid-Open No. 4-166424, and the tilling speed can be switched between normal rotation and reverse rotation at a first speed. A description will be given of the cultivator used in this manner. FIG. 8 shows a small cultivator in which a rotary is integrally incorporated. (1) is a frame, on which an engine (2) is mounted, and from an engine pulley (3) via a belt (4). Power is transmitted to an input pulley (5) mounted on a shaft (5a), and a wheel (7) mounted on an axle (7a) via a transmission gear in an upright portion of an L-shaped transmission case (6). Drive). Further, the rotary (8) is driven via the transmission gear at the inclined portion of the transmission case (6). (9) is a hood, which is also used as a mission case upper cover. A guide groove (11) for the speed change lever (10) is provided in the rear inclined portion of the hood (9) as shown in FIG. 9, and the guide groove (11) has a horizontal H shape. The shift lever (10) is operated along the H-shaped guide groove (11) to move the fork shafts (23) and (25) shown in FIG. The tension roller (12) is operated by a clutch lever (14) of a handle (13) attached to an inclined portion of the transmission case (6). A differential lock lever (15) is mounted around the middle of the handle (13). The rotary (8) has a rotary cover (16), and its rear cover (17) is vertically rotated about a rotary shaft (8a) by a support plate (18).
A resistance bar (20) and a cultivation depth adjusting bar (21) are attached to a boot-type fastening member (19) for fixing the rotary cover (16) so as to be vertically adjustable. Rear cover (17)
There is a rubber droop (22). FIG. 9 shows a fork shaft (23) for the traveling system. The speed change lever (10) is moved to the fork shaft (23).
When it is inserted into the slit (24) and moved to the left and right, the reverse operation is performed to the first speed and the second speed via the shifter. Neutral is provided between the first speed and the second speed and between the first speed and the reverse speed as shown in FIG. In FIG. 9, reference numeral (25) denotes a rotary fork shaft, and a speed change lever (10).
Is inserted into the slit groove (26) of the fork shaft (25) and is moved left and right to rotate the rotary forward and reverse through the shifter. Therefore, first, the shift lever (10)
Is in the slit (2) of the fork shaft (23)
4). In this state, when the shift lever (10) is turned to the right to move the fork shaft (23) to the right, the traveling system gear is shifted to the second speed via neutral, and is turned to the left to turn to the fork. When the shaft (23) is moved to the left, the traveling system gear becomes a reverse gear via neutral. When the gear is rotated to the lower groove of the guide groove (11), first, the shift lever (10) is moved to the fork shaft (2) in the neutral position.
5) Fit into the slit (26). When the shift lever (10) is turned to the right and the fork shaft (25) is moved to the right, the rotary gear is rotated forward, and conversely, the fork shaft (25) is turned to the left to move the fork shaft (25) to the left. When you move it, it will be in the reverse state. According to the above, the neutral position for rotating the rotary in the normal direction and the reverse direction is the first speed position, so that the tilling speed can be switched between the normal direction and the reverse direction in the first speed. The switching is only required to move along the horizontal H-shaped guide groove, so that the operation is easy. However, there is a drawback that the working speed suitable for the tilling work cannot be obtained and it is not possible to cope with the condition of the field. Accordingly, the present invention is to provide a simple and inexpensive safe cultivator having a structure with good operability capable of responding to the condition of the field with a high working speed adapted to the tilling work. FIGS. 4 and 5 show an apparatus for driving a rotary (8) via a transmission gear at an inclined portion of a transmission case (6). The sprocket (27) of the input shaft (61) and the sprocket (2) of the rotary shaft (8a)
A chain (33) is stretched over the sprocket (30) of the intermediate shaft (29) and the intermediate shaft (29) through the idle sprocket (32) of the intermediate shaft (31) as shown in FIG. Accordingly, the input shaft (61) is driven to move the chain (33) as shown in FIG.
, The sprocket (28) rotates counterclockwise, and the rotary shaft (8a) spline-fitted thereto rotates counterclockwise. Sprocket (3
0) also rotates in the counterclockwise direction, but the gear (34) fixed thereto is loosely fitted to the rotary shaft (8a).
5) and the gear (35) is rotated clockwise.
The tilling claw (39) planted in the case (37) of FIG. 5 rotating integrally with the boss (36) of the gear (35) rotates clockwise. On the other hand, the tilling claw (40) planted on the rotary shaft (8a) driven by the sprocket (28) rotates counterclockwise. The tip of the tilling nail (39) is outwardly bent in the illustrated one. The tip of the tilling nail (40) is bent inward on both the left and right sides. Tilting claws (39) forming a uniaxial forward / reverse structure from the above configuration
Can prevent the cultivator from dashing. FIG. 6 shows a system for driving wheels (7) mounted on an axle (7a) via gears in an upright portion of a transmission case (6). (41) (42)
Is a traveling fork shaft, and when the speed change lever (10) is fitted into the slit groove (42a) of the traveling fork shaft (42) and the fork shaft (42) moves left and right, a shaft (5) integrated with the input shaft (5a) is formed. The second gear (45) on the shaft (48) is moved left and right by the shifter (43) so that the first gear (4) on the shaft (48) is moved.
6) or fitted to the second gear (47), and the output shaft (49)
The sprocket (52) of the differential case is driven by a chain from the sprocket (50) via the intermediate gear (51) to drive the axle (7a). When the transmission lever (10) is fitted into a slit groove (not shown) of the traveling fork shaft (41) and the traveling fork shaft (41) moves left and right, the shifter (53) is shifted by a shifter gear (54) on the shaft (44). Can be moved left and right to mesh with the third speed gear (55) on the shaft (48) and the reverse gear (56) on the shaft (49). A rotary fork shaft (57) is provided to prevent danger without rotating the rotary at the time of reverse meshing at the third speed and to enable rotation of the rotary at the first speed and the second speed. The shifter (58) is moved left and right by the fork shaft (57) to shift the shifter gear (5) on the shaft (44).
When the gear (9) is moved left and right to engage or disengage with the gear (60) idled on the shaft (49), the gear (62) idled on the shaft (48) when engaged. ) Is engaged with the gear (60a) integral with the gear (60), so that the gear (62) is driven from the input shaft (44), and the gear (62) is driven.
Then, the rotary sprocket (27) of the boss (62a) that rotates integrally is driven. Therefore, by the engagement of the shifter gear (59) of the input shaft (44) with the gear (60),
It becomes a so-called rotary clutch, and when it is released, it becomes a rotary clutch off. Whether the rotary fork shaft (57) is engaged or disengaged depends on the operation of the shift lever (10) shown in FIG. That is, when the shift lever (10) is operated downward in the drawing, the traveling fork shaft (4) is operated.
2) is engaged with the slit groove (42a) and the transmission lever (1) is engaged.
When the button (0) is operated upward, it engages with slit grooves (not shown) of the traveling fork shaft (41). By sliding the step gear (45) and the shifter gear (54), the traveling fork shaft (42) can perform the reverse operation such as the first speed, the second speed, and the traveling fork shaft (41) the third speed. Disengage the clutch,
The first and second speeds are provided with the following interlocking mechanism so that the rotary can be rotated with the clutch engaged. As shown in FIGS. 2 and 3, the transmission lever (10) has a bolt (7) protruding from the transmission case (6).
4), a nut (63) is screwed into the nut (63), and the nut (63) is attached to the shaft cylinder (10a) of the collar (64) fitted around the outer periphery of the nut (63) so as to be rotatable left and right.
0) is pivotably supported by the transmission case (6). Plate (65) for collar (64)
Is fixed, and an engagement groove (66) is provided in the plate (65). One end of an L-shaped member (67) is engaged with the engagement groove (66), and the L-shaped member (67) is U-shaped projections (68) (68) formed integrally with 6) are rotatably supported, and a U-shaped member (69) in side view is fixed to the other end of the L-shaped member (67). The rotary fork shaft (57) is pinned. Therefore, when the speed change lever (10) is moved up and down as shown in FIG. 1, the collar (64) fixed to the shaft (10a) via the shaft cylinder (10a).
Also swings up and down in FIG. As the plate (65) moves up and down, the engagement groove (6)
Since the engaged bent portion of the L-shaped member (67) is moved up and down in 6), the other end of the L-shaped member (67) rotates in the circumferential direction, and the U-shaped member fixed to this other end. (69)
Of the rotary fork shaft (57) which is pinned to the U-shaped member (69). Therefore, when the operation lever (10) is swung downward, the traveling fork shaft (42) switches between the first speed and the second speed by the left and right movement, but the plate (65)
Swings downward to swing one end of the L-shaped member (67) downward and moves the U-shaped member (69) at the other end inward, so that the rotary fork shaft (5) as shown by the arrow in the drawing.
7) is moved inward and the shifter (58) is moved in the direction of engaging the clutch. Further, when the shift lever (10) is moved upward, the speed is switched between the third speed and the reverse speed, whereby the plate (65) is swung upward,
Since the one end of the L-shaped member (67) is swung upward and the U-shaped member (69) at the other end is moved outward, the rotary fork shaft (57) is moved outwardly with the clutch disengaged. . The operation of the shift lever (10) as described above is performed along the H-shaped guide groove (70) shown in FIG.
Therefore, the H-shaped guide groove (70) has a structure in which a neutral groove (72) communicates between the first-speed and second-speed switching groove (71) and the third-speed and reverse switching groove (73). In the present invention, the rotary is rotated at the first speed and the second speed, but the rotary is not rotated at the third speed and the reverse, and the speed change lever (10) and the rotary fork shaft (57) are connected as shown in FIG. A plate (65) having an engagement groove (66); an L-shaped member (67) having one end engaged with the engagement groove (66) of the plate (65); and an L-shaped member (6).
If the U-shaped member (69) fixed to the other end of (7) is interlocked, and the interlocking mechanism is formed compactly with a thin member, the structure can be simplified and the cost can be reduced. However, since the interlocking mechanism is provided outside the transmission case, the thickness of the transmission case itself can be reduced and the distance between the transmission case and the wheels can be increased as compared with the case where the interlocking mechanism is provided inside the transmission case. In addition, since the interlocking mechanism is formed of a member having a small thickness, the traveling path can be seen from between the transmission case and the wheels, thereby improving safety. In addition, since the tilling speed can be set to a plurality of stages by the above-described device, it is possible to increase the efficiency by setting the traveling speed to a working speed suitable for the tilling operation according to the state of the field. In addition, erroneous operation can be prevented because the operation is performed with one lever. Also, 1st speed,
H-shaped guide groove (70) communicating with the neutral groove (72) between the second-speed switching groove (71) and the third-speed, reverse switching groove (73).
The operation is easy to understand by arranging the gearshift lever (10) to be able to be inserted into the groove, and not only can the tiller speed be increased to two steps by the clutch being engaged in the rotary in the groove (71) due to the regulation of the gearshift lever by the guide. , Groove (73)
When the transmission lever (10) is inserted into the rotary, the clutch is not engaged with the rotary and the reverse and the third speed can be safely operated. In any case, the present invention provides a cultivator capable of performing a traveling shift and a tilling shift with a single swingable shift lever, and a shifting operation capable of obtaining a plurality of working speeds. When the speed change lever is engaged with the fork shaft, the rotary fork shaft is set to the clutch engagement side, and when the speed change lever is engaged with the road running speed and the reverse operation fork shaft, the rotary fork shaft is set to the clutch release side. An interlocking mechanism for switching operation is provided between the shaft support portion of the shift lever and the rotary fork shaft, the interlocking mechanism includes a swingable plate fixed to the shaft support portion of the shift lever, and one end provided in an engagement groove of the plate. A transmission operating device for a cultivator, comprising: a rotatable L-shaped member engaged with a U-shaped member; and a U-shaped member that allows a rotary fork shaft fixed to the other end of the L-shaped member to enter and exit. Is intended to subject matter, since the tilling speed can be taken in a plurality of stages, it is possible to work speed to adapt the travel speed to tilling. Further, as a preferred embodiment, the guide groove of the shift lever is an H-shaped groove, one of which is a guide groove capable of a plurality of working speeds, the other is a reverse, a road traveling speed guide groove, and these are communicated by a neutral groove. By doing so, it is easy to operate along the guide groove, it is possible to prevent the rotary from rotating at the reverse speed and on the road running speed, and a safe cultivator is obtained. Therefore, the object of obtaining a safe tiller capable of preventing erroneous operation can be achieved. Further, by providing a device for reversing the tilling claw provided near the transmission case and allowing the other tilling claw to rotate forward, a uniaxial forward / reverse rotary can be obtained, thereby achieving the object of obtaining a cultivator capable of preventing dashing. According to the present invention, the traveling speed change and the clutch engagement / disengagement of the rotary can be performed by swinging the speed change lever up, down, left and right. Although it rotates, the rotary does not rotate at road running speed or reverse speed, so the tilling speed can be taken in multiple stages, the working speed suitable for tilling work can be taken, it can respond to the condition of the field, and the simple cost of a structure with good operability It is possible to obtain a tiller that is easy to operate. Since the rotary does not rotate at the traveling speed on the road or in reverse, danger is prevented and a safe cultivator can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of an interlocking mechanism between a shift lever and a rotary fork shaft of the present invention. FIG. 2 is a perspective view of the interlocking mechanism. FIG. Drive mechanism view from the side of the rotary [Fig. 5] Cutaway front view of the rotary of the cultivator [Fig. 6] Cutaway front view of the running part of the cultivator [Fig. 7] Explanatory view of the H-shaped guide groove [Fig. [Figure 9] Perspective view showing a conventional shift lever support part [Description of symbols] 1 Frame 2 Engine 3 Engine pulley 4 Belt 5 Input pulley 6 Transmission case 7 Wheels 8 Rotary 9 Bonnet 10 Shift lever 11 Guide groove 23 Fork shaft 24 Slit groove 25 Fork shaft 26 Slit groove 41 Fork shaft 42 Fork shaft 42a Slit groove 43 Shifter 53 Shifter 57 Rotary fork shaft 58 Shifter 64 Over 65 plates 66 engaging grooves 67 L-shaped member 69 U-shaped member 70 H-shaped guide grooves

Claims (1)

(57) [Claims] [Claim 1] Running speed change with one swingable shift lever
Tiller that can perform tillage shifting
Gear shifting operation for obtaining a multi-stage working speed.
Rotary fork when the shift lever engages the work shaft
Move the shaft to the clutch engagement side, and
When the gearshift lever engages the
Interlocking mechanism that switches the clutch shaft so that it is on the clutch off side
Between the shaft support of the shift lever and the rotary fork shaft.
And the interlocking mechanism is provided with a swing fixed to the shaft support portion of the shift lever.
A movable plate and one end engages with the engagement groove of the plate
A rotatable L-shaped member and the other end of the L-shaped member.
U-shaped part that allows the fixed rotary fork shaft to enter and exit
Transmission operating device for tilling cultivator, composed of lumber.