JPS624761Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Field of Industrial Application" The present invention relates to a relatively small mobile agricultural machine, such as a walking rice transplanter, in which a machine body including an engine, a seedling stand, etc. is supported on paddy wheels so that it can rise and fall.

``Prior art'' As shown in Japanese Utility Model Application Publication No. 49-131475, there has been a technique in which a tapered part is provided in the ring groove of a shift fork shaft, and the ball of the shift fork is guided by the tapered part to engage the ring groove. It was hot.

"Problems to be Solved by the Invention" In the prior art, when the transmission gear is not fully engaged, the ball is brought into contact with the tapered part to return to the neutral position, so the transmission gear is not in a stopped state. When the gear is changed via the shift fork, the teeth, pins, or pawls formed on the gear change gear cannot mesh smoothly due to this interference, so it is necessary to drive the gear change gear in a half-clutch operation for engagement. However, the gear shifting operation is troublesome and it is not easy to improve the handling and operability, and there are problems such as it is easy to return to neutral when the gear shifting operation is incomplete due to half-clutch operation, and the gear shifting operation cannot be performed easily. It was hot.

``Means for Solving the Problems'' However, the present invention forms a tapered portion on the side edge of the ring groove of the transmission hawk shaft, which is perpendicular to which the transmission gear meshes, and which is contacted by a ball provided on the transmission shift hawk. Two forks that independently perform different speed change operations are provided with a speed change arm that is linked to the axial sliding of the speed change rod connected to the speed change lever, and a speed change arm that is linked to the rotation of the speed change rod about the axis. The present invention is characterized in that each of the speed change arms is separately connected to each shift fork of the shaft.

``Operation'' Therefore, even if the speed change gear interferes with the speed change during a speed change operation, the balls contact the tapered part and act to move the speed change gear to the shift position, so the speed change gear can be easily engaged by engaging the clutch. This makes it possible to obtain a proper meshing condition without having to return to neutral as in the past, and it is easier to handle and improve shift operability than before, and it is possible to use two shift forks with a single shift rod. Even if the shift forks are operated separately, the movement caused by machining errors of the shift fork can be absorbed by the guide of the ball in the tapered part, and different gear shifting operations can be properly maintained separately, simplifying the gear shifting operation system including the gear shifting rod. Therefore, it is possible to easily improve the speed change function and the speed change switching function.

"Embodiment" An embodiment of the present invention will be described below in detail based on the drawings. Figure 1 is a schematic side view of a walk-behind rice transplanter for four-row planting, in which 1 is the engine, 2 is the machine base on which the engine 1 is mounted, and 3 is the main transmission fixed to the rear end of the machine base 2. A case 4 is a planting transmission case fixed to the main transmission case 3 via a transmission case 5, 6 is a planting claw drive case supported on both sides of the planting transmission case 4, and 7 is a case based on the case 4. A steering handle 8 whose ends are connected and supported connects to the handle 7 via a guide rail 9 and a sliding rail 10.
11 is a planting claw that takes out one seedling from the seedling platform 8 and plants it; 12 is the engine 1; and a bonnet that covers the upper surface of each case 3, 4, and 5; 13 is a side cover; 14 is a preliminary seedling stand installed on the upper surface of the bonnet 12 via a support 15; 16 is a swing case 17 on both sides of the main transmission case 3. Paddy wheel installed through, 18
1 is a main float supported below the engine 1 and each of the cases 3, 4, and 5; 19 is a side float provided on both sides of the main float 18; 20 is a recoil start handle; 21 is a travel and interstice gear shift lever; and 22 is a main clutch lever. , 23 is a wheel in/out lever, and 24 is a side clutch lever.

As shown in FIGS. 2 to 7, the engine 1
a drive shaft 26 having an input pulley 25 connected to the drive shaft 26; a travel countershaft 28 interlockingly connected to the drive shaft 26 via a travel transmission gear 27; a final gear 29 and left and right side clutches 3 connected to the countershaft 28;
The traveling output shaft 3 is interlocked and connected via 0 and 30.
1 and 31 are provided in the transmission case 3, and are configured to drive the left and right paddy wheels 16.

Further, the drive shaft 26 is interlocked and connected to the drive shaft 26 via an inter-stock transmission gear 32 which is a transmission wheel.
The transmission case 3 is equipped with a PTO counter shaft 33 and a PTO output shaft 36 which is interlocked and connected to the counter shaft 33 via bevel gears 34 and 35 to drive the seedling platform 8 and the planting claws 11. The seedling table 8 is slid back and forth, and the seedlings are continuously planted using planting claws 11.

Furthermore, a shift fork 40 is provided for engaging the traveling transmission gear 27 with the low speed, high speed, and reverse gears 37, 38, and 39 that are constantly interlocked with the drive shaft 26, and the shift fork is attached to the hawk shaft 41 attached to the transmission case 3. 40 to be slidably supported, and the gear shift lever 21
A transmission rod 42 connected to the transmission case 3 is slidably and rotatably inserted into the transmission case 3, and an L-shaped transmission arm 44 is supported in the middle by the transmission case 3 via a fulcrum shaft 43. The arm 44 is engaged with the base end of the shift hawk 40.
The other end of the shift rod 42 is engaged with the ring groove 45 of the shift rod 42, and the shift rod 4 is moved by operating the shift lever 21.
The shift fork 40 is displaced via the speed change arm 44 only by the push/pull operation in the axial direction of the second shift arm 44 to perform a traveling speed change.

On the other hand, gears 46, 4 for 60, 70, 80, and 90 stocks are always connected to the drive shaft 26.
7, 48, 49 are provided with a shift hawk 50 for engaging and operating the inter-stock transmission gear 32, and the shift hawk 50 is slidably supported by a transmission hawk shaft 51 attached to the transmission case 3,
The base end of a shift arm 52 is fixed to the shift rod 42, the tip of the shift arm 52 is engaged with the shift fork 50, and the shift is performed only by rotational movement of the shift rod 42 around its axis by operating the shift lever 21. The shift hawk 40 is displaced via the arm 52, and the transmission gear 32 is brought into mesh with the gears 47 and 48, which are engaged with and pivotally supported by the drive shaft 26, through these teeth.
The gears 46 and 49 are freely rotatably supported by the countershafts 33 on both sides of the
an engagement hole 53 formed in the gears 46, 49,
54 as well as pins 55 and 56 integrally formed on the side surface of the transmission gear 32 to mesh with each other.

Next, the hawk shaft 51 is provided with ring grooves 57, 5 for positioning 60 to 90 rings and for maintaining neutrality.
8, 59, 60, and 61, and a positioning ball 62 which is selectively engaged with the ring grooves 57 to 61 is installed in the shift fork 50 via a spring 63 so as to be freely protrusive. Then, tapered portions 64 and 65 are formed on the side edges of the ring grooves 57 and 60 on the side of the adjacent ring grooves 58 and 59, and the pin 55 or 56 on the side surface of the inter-stock transmission gear 32 is brought into contact with the side surface of the gear 46 or 49, Immediately before the interlocking transmission gear 32 engages the pin 55 or 56 in the engagement hole 53 or 54,
The ball 62 is connected to the tapered portion 64 via the spring 63.
or 65, and the engaging hole 53 or 54 and the pin 55 or 56 are connected by rotation of the gear 46 or 49 or the like.
When the positions of the taper portions 64 or 6
The ball 62 is pushed into the annular groove 57 or 60 by the thrust of 5.
and move the pin 55 into the engagement hole 53 or 54.
or 56 are formed so as to mesh with each other.

The present invention is constructed as described above, and when the planting claw 11 takes out one seedling from the seedling stand 8 which is moved back and forth from side to side and performs rice planting work continuously, the shift lever 21 is operated. Shift rod 42
In addition to shifting the traveling gear by pushing and pulling the rice-plant, the shifting rod 42 is rotated to shift the gear between plants, and before starting the rice planting work, the gear is shifted between plants depending on the field and variety of seedlings. Then, with the aircraft stopped, operate the gear shift lever 21 to change gear 3 to gear 46 for 60 shares, for example, as shown in Fig. 5.
2, when the positions of the engagement hole 53 of the gear 46 and the pin 55 of the transmission gear 32 are different from each other as shown by the imaginary line in FIG. At this time, the spring 63 causes the ball 62 to move into the tapered portion 64 on the side edge of the ring groove 57.
Therefore, when the engine output is transmitted to the input pulley 25 and rice planting work is started under the condition shown in FIG. However, the taper part 6
The ball 62 engages and moves into the ring groove 57 due to the thrust of the gear 4, so that the ball 62 automatically engages with the ring groove 57, and each gear 3
2 and 46 are integrally engaged to transmit the PTO output.

The gear 49 for 90 stocks and the inter-stock transmission gear 32 can be engaged in the same manner as the gear 46, and the gear teeth and claws can also be engaged in place of the engagement holes 53, 54 and pins 55, 56. This can be done in the same way as the example.

"Effects of the Invention" As is clear from the above embodiments, the present invention has a shift fork 5 for transmission at right angles with which the transmission gear 32 meshes.
A tapered portion 64 that the ball 62 provided at 0 comes into contact with,
65 is the ring groove 57, 60 of the gear hawk shaft 51.
A shift arm 44 formed on the side edge is provided, which is interlocked with the axial sliding of the shift rod 42 connected to the shift lever 21, and a shift arm 52 which is interlocked with the rotation of the shift rod 42 about the axis. The shift arm 44, 52 is separately connected to each shift hawk 40, 50 of two hawk shafts 41, 51 that perform different shift operations independently, so that the shift gear 32 does not interfere with the shift gear 32 during the shift operation. Even when the clutch is engaged, the balls 62 come into contact with the tapered portions 64 and 65 and act to move the speed change gear 32 to the speed change position.
It is possible to easily engage the gears and obtain a proper engagement state without having to return to neutral as in the past, and it is easier to handle and improve shift operability than before. Even if the two shift forks 40, 50 are operated separately with one shift rod 42, the free movement due to machining errors of the shift forks 40, 50 can be absorbed by the guidance of the balls 62 of the tapered portions 64, 65, This provides practical effects such as being able to properly maintain each shift operation, simplifying the shift operation system including the shift rod 42, and easily improving the shift switching function.

[Brief explanation of the drawing]

Fig. 1 is a side view of a walking rice transplanter showing an embodiment of the present invention, Fig. 2 is a sectional view of the transmission case,
3 and 4 are explanatory views of the same parts, FIG. 5 is a cross-sectional explanatory view of the essential parts, FIG. 6 is a partial side view of the previous figure, and FIG. 7 is an enlarged view of the parts. 21... Speed change lever, 32... Inter-stock speed change gear (speed change transmission wheel), 40, 50... Shift fork, 4
1,51...Shift hawk shaft, 42...Shift rod, 44,52...Shift arm, 57,60
... Positioning ring groove, 62 ... Positioning ball, 64, 65 ... Tapered portion.

Claims (1)

[Scope of utility model registration request] The tapered portions 64 and 65, which the transmission gear 32 meshes with and which the balls 62 provided on the transmission shift hawk 50 contact, are connected to the ring groove 5 of the transmission hawk shaft 51.
7 and 60, and a transmission arm 44 that is connected to the transmission lever 21 and interlocks with the sliding movement of the transmission rod 42 in the axial direction, and said transmission rod 42.
The shift hawks 40, 5 of the two hawk shafts 41, 51 are provided with a shift arm 52 that is linked to the rotation about the axis of the
1. A transmission device for a mobile agricultural machine, characterized in that said transmission arms 44 and 52 are respectively connected to said transmission arms 44 and 52, respectively.