JPH0647157Y2 - Working unit transmission in mobile agricultural machinery - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a work unit transmission in a mobile agricultural machine such as a point-seeding type seeder or seedling planter.

(B) Conventional technology Conventionally, a device that adjusts the stock speed by changing the driving speed of the working unit with respect to the running speed is used to meet all the requirements where the stock requirements are different depending on the user or the other. In addition, the number of stages of the transmission is increased, which not only makes the cost significantly higher, but is actually wasted because it is only a part suitable for the other.

In order to solve such a problem, the transmission specified by the specifications of the device is incorporated.

(C) Problems to be solved by the invention The above-described method of incorporating the transmission may not meet the specifications at the end sale, and in such a case, disassemble the mission case and disassemble the umbrella. It is necessary to change the gears, and this work requires a large number of man-hours, which is costly and difficult when the delivery time is short.

In particular, it was difficult to attach and detach the bevel gear on the clutch shaft in the front-rear direction.

(D) Means for Solving the Problems The present invention is a transmission gear in which a plurality of stages of drive gears are attached to a drive shaft in a transmission case, and a transmission shaft parallel to the drive shaft is selectively meshed with the drive gear. In a mobile agricultural machine in which a drive bevel gear attached to the speed change shaft is engaged with a driven bevel gear of a clutch shaft for transmission, the speed change shaft is removably supported in a transmission case, and the driven umbrella is The gear is supported on the clutch shaft through a sleeve that does not move under thrust load, the end of the sleeve is fixed by a snap ring, and the outer diameter of the snap ring is made smaller than the shaft hole of the driven bevel gear. Even if the case is not disassembled, the bevel gear of the transmission shaft can be inserted / removed together with the transmission shaft, the bevel gear of the clutch shaft can be freely inserted / removed in / from the sleeve, and the sleeve can be pulled out by the spring pressure of the clutch. The above problem was solved by not doing so.

(E) Action The traveling speed is changed by the traveling speed change unit in the mission case, and the working speed of the working machine is changed by shifting the shift gear of the working machine drive unit and selecting the driving gear.

Further, since the sleeve interposed on the clutch shaft is fixed by the snap ring, it does not come off due to the spring pressure of the clutch, and when the gearbox of the working unit is reassembled, the gearshift shaft is pulled out from the mission case. The bevel gear mounted on the speed change shaft can also be taken out together with the speed change shaft. In this state, if the bevel gear attached to the clutch shaft is pulled toward the position where the speed change shaft is arranged by inserting a hand through the hole through which the speed change shaft is pulled out, the bevel gear can be easily removed from the sleeve without obstructing the retaining ring. Can be pulled out.

In this state, bevel gears having different numbers of teeth are fitted to the sleeve of the clutch shaft, the bevel gear of the speed change shaft is externally replaced, and the speed change shaft is inserted into the transmission case through the hole and mounted to complete the assembly.

(F) Embodiments An embodiment of the present invention will be described with reference to the drawings. An engine 3 is mounted on a front portion of a body frame 4 having front wheels 1 and rear wheels 2, and a driver's seat 6 is provided behind a steering wheel 5. The rear part is equipped with a planting device (or a point-seeding type seeding device) as a working machine by the top link 7 and the lower link 8, and the top link 7 is moved up and down by a hydraulic cylinder 10 centering on the front part.

Further, the front wheels 1 and the rear wheels 2 are driven by a traveling transmission device in a mission case 11, and an input shaft of the work machine is a transmission shaft 13 and a transmission shaft 13 by a clutch shaft 12 which also projects rearward from the transmission case 11 and also serves as a PTO shaft. Driven via joint 14.

Further, the drive shaft 16 supported by the bearings 15 and 15 in the mission case 11 has drive gears 17, 18 and 19 for a working machine in addition to the speed change gears of the traveling speed change unit, and the engine 3 at the outer end. An input pulley 16a is attached, which is driven by the output pulley of FIG.

The outer ends of the bosses 22 of the transmission gears 20, 21 that selectively mesh with the drive gears 17 ...
A hollow shaft 25 is rotatably held by a bearing 23 on the side wall of 1 and is slidably and transmissibly spline-fitted to the outer periphery of a hollow shaft 25 fixed by a snap ring 24. Sliding by the shifter 27 that moves left and right,
One end of the speed change shaft 28 is inserted into the hollow shaft 25 and spline-fitted at a portion corresponding to the bearing 23.

At the other end of the speed change shaft 28, a rotatable drive bevel gear 30 and a pair of clutch bodies 31 and 3 that mesh with each other and are rotatable inside and outside.
2, a torque limiter composed of a spring receiver 33 spline-fitted to the outer end and a compression spring 33a interposed between the outer clutch body 32 and the spring receiver 33 is mounted, and the drive bevel gear 30 and the inner side The clutch body 31 is interlockingly connected by a dock clutch, and the outer clutch body 32 and the spring receiver 33 are meshed with each other even in a transmission state and are connected by a long pawl capable of sliding in the axial direction.

Further, the inner clutch body 31 is supported by a ring-shaped support member 35 via a bearing 34, and the support member 35
Is fitted into the hole 36 of the mission case 11 via an O-ring and screwed with bolts 37.

FIG. 4 shows another mounting method of the drive bevel gear 30 and the torque limiter. The speed change shaft 28 has the same diameter as or smaller than the portion in which the drive bevel gear 30 is fitted, and the hollow shaft 25 side has a retaining ring. Since the inner end of the drive bevel gear 30 is received by the long collar 30a stopped by 30b and the inner end of the clutch body 32 is stopped by the stop ring 32a so as not to slip out, the transmission shaft 2
When the drive bevel gear 30 is replaced by removing 8 and the drive bevel gear 30 is removed, the drive bevel gear 30 can be easily attached and detached without removing the torque limiter by simply removing the retaining ring 30b and the collar 30a.

Thus, a sleeve 38b having a large-diameter step portion 38a at the rear portion is rotatably and detachably fitted to the small-diameter portion 12a at the front end of the clutch shaft 12, and the drive bevel gear and the drive bevel gear are attached to the sleeve 38b. The driven bevel gear 38 that meshes is rotatably fitted, and the sleeve
The driven bevel gear 3 is attached to the end of 38b via a thrust liner.
It is stopped by a retaining ring 38d whose outer diameter is smaller than the shaft hole of 8.
The clutch portion on the rear end surface of the boss of the driven bevel gear 38 is meshed with a fixed position stop clutch 39 which is disengaged at a position where the planting pawl is raised by the stopper 39a.

Also, the bonnet 40 and the side steps 4 on the left and right
1, 41 are integrally molded, and the lower front end is connected to the frame by a fulcrum shaft 42 so as to be openable and closable, and the rear cover 44 of the operation panel 43 has a steering column 47 with a bolt 45 on the upper side.
It is detachable by screwing it to the machine body frame 4 with bolts 46, 46 on both sides of the lower part, and since the operation step 48 is also detachably screwed to the machine body frame 4, the bonnet 40 is attached. Open with side steps 41,41,
When the rear cover 44 and the operation step 48 are removed, the upper surfaces of the engine 3, the transmission case 11, the steering device, etc. are all opened, and the maintenance and inspection thereof can be easily performed.

Reference numeral 50 is a speed change lever, 51 is a main speed change lever, and 52 is an alignment marker. The base of the support arm 53 is attached to a bracket 54 screwed to the side surface of the side step 41.

Next, the operation will be described. The power of the engine 3 is distributed from the speed change shaft 28 to the traveling speed change unit and the work machine speed change unit, and the rotation of the clutch shaft 12 causes the speed change gears 20 and 21 to drive the drive gears 17, The speed is changed by selecting and meshing any one of 18, 18 and further by the drive bevel gear 30 and the driven bevel gear 38. At that time, the driven bevel gear 38 is moved by the sleeve 38b.
Since it is received by the large diameter step portion 38a and the sleeve 38b is received by the front step portion of the clutch shaft 12, it does not move due to the thrust load.

When changing the adjustment range between the stocks to the larger side or the smaller side, the torque limiter cover 55 is removed, the bolts 37 are removed, and the gearshift shaft 28 is pulled together with the torque limiter. Since the limiter, the bearing 34, the support member 35 and the driving bevel gear 30 come out together, when the driven bevel gear 38 is pulled forward by putting a hand through the hole 36, the driven bevel gear 38 comes out from the sleeve 38b, so that the mission case 11 Can be taken out. At that time, since the outer diameter of the retaining ring 38d is smaller than the shaft hole of the driven bevel gear 38, there is no obstacle, and the retaining ring 38d maintains the state in which the sleeve 38b is retained. Therefore, another set of drive bevel gears 30 having other gear ratios is attached to the transmission shaft 28 outside the machine, another driven bevel gear 38 is also attached to the sleeve 38b of the clutch shaft 12, and the transmission shaft 28 and the torque limiter are combined. With one end of the transmission shaft 28 inserted into the transmission case 11 through the hole 36, the tip end is fitted into the spline of the hollow shaft 25, the support member 35 is fitted into the hole 36, and then the bolt 37 Tighten and fix it to the mission case 11. 56 and 56a are bolts.

When the clutch shaft 12 is decelerated by performing such a rearrangement, the stock can be shifted in three steps over a wide range, and when the speed is increased, the stock can be shifted in three steps on the narrow side.

(G) Effect of the invention As described above, the invention is based on the drive shaft in the mission case 11.
16 is provided with a plurality of stages of drive gears 17 ..., The transmission shaft 28 parallel to the drive shaft 16 is provided with the transmission gears 20 ... Which selectively mesh with the drive gears 17 ... In a mobile agricultural machine in which the attached driving bevel gear 30 meshes with the driven bevel gear 38 of the clutch shaft for transmission, the speed change shaft 28 is movably supported in the transmission case, and the driven bevel gear 38 is
The sleeve 38 that does not move to the clutch shaft 12 under thrust load
Since it is supported via b, the end of the sleeve 38b is fixed by a stop ring 38d, and the outer diameter of the stop ring 38d is smaller than the shaft hole of the driven bevel gear 38, the transmitting sleeve 38b is the clutch. The transmission shaft 28 does not come out due to spring pressure, and the transmission shaft 28 is used when changing the range of stock adjustment.
The drive bevel gear 30 mounted on the transmission shaft 28 can be replaced with the drive bevel gear 30 on the outside, and the driven bevel gear 38 on the clutch shaft 12 side is a hole in which the transmission shaft of the transmission case 11 is extracted. By inserting the hand from 36 and pulling it in the axial direction, the sleeve 38b can be easily pulled out without disturbing the retaining ring 38d while it is still attached to the clutch shaft 12, and the driven bevel gears having different numbers of teeth. It can be easily replaced by simply fitting 38 into the sleeve.

Therefore, unlike the conventional case, it is possible to easily and swiftly change the specifications even at a shop or the like without requiring a troublesome work such as disassembling the mission case 11.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a developed sectional view of a main part of a mission case, FIG. 2 is a side view in which a working part of a passenger rice transplanter is omitted, and FIG. FIG. 4 is a perspective view of the front part, and FIG. 4 is a developed sectional view of the essential parts of another embodiment. 11 …… Mission case, 12 …… Clutch shaft, 16 …… Drive shaft, 17,18,19 …… Drive gear, 20,21 …… Shift gear, 23,
34 …… Bearing, 25 …… Hollow shaft, 28 …… Shift shaft, 35…
… Support member, 36 …… Hole, 30 …… Drive bevel gear, 38 …… Driven bevel gear, 38a …… Large diameter step, 38b …… Sleeve, 38d ……
Retaining ring

Claims (1)

[Scope of utility model registration request] 1. A transmission gear having a plurality of stages of drive gears 17, ... Attached to a drive shaft 16 in a mission case 11, and a transmission shaft 28 parallel to the drive shaft 16 selectively meshes with the drive gears 17 ...
Drive bevel gear 30 fitted with 20 ...
In a mobile agricultural machine configured to be engaged with a driven bevel gear 38 of a clutch shaft for transmission, the transmission shaft 28 is removably supported in a transmission case, and the driven bevel gear 38 is moved to the clutch shaft 12 by a thrust load. A mobile agricultural machine, characterized in that it is supported via a sleeve 38b, the end of the sleeve 38b is fixed by a retaining ring 38d, and the outer diameter of the retaining ring 38d is smaller than the shaft hole of the driven bevel gear 38. Work part transmission in.