JPH0545316U - Mobile farm machinery work unit transmission - Google Patents

Abstract

(57) [Abstract] [Purpose] The transmission shaft is supported by a cover bracket that covers the outside of the torque limiter provided on the transmission shaft, and the transmission shaft and P
(EN) Provided is a working unit transmission capable of simultaneously removing a cover bracket and a transmission shaft when replacing a TO shaft bevel gear. [Structure] A transmission shaft supported in a transmission case and transmitting power from an input shaft, a PTO shaft mounted with a bevel gear that meshes with a bevel gear mounted on the transmission shaft, and a shaft end portion of the transmission shaft. The torque limiter is attached, and a cover bracket that covers the outside of the torque limiter is provided.The cover bracket is provided with a bearing support portion for the transmission shaft, and is mounted on the transmission case while supporting the transmission shaft. Attached bevel gear and above PTO
When replacing the bevel gear attached to the shaft, the cover bracket was removed from the mission case so that the transmission shaft could be removed at the same time.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work unit transmission of a mobile agricultural machine, and more particularly, to a cover bracket that covers the outside of a torque limiter provided on the transmission shaft to support the transmission shaft and replace the bevel gears of the transmission shaft and the PTO shaft when replacing the cover gear The present invention relates to a work unit transmission in which a bracket and a transmission shaft can be removed at the same time.

[0002]

[Prior Art]

 Conventionally, a working unit transmission of a mobile agricultural machine (seedling transplanter) as shown in FIG. 3 has been disclosed in Japanese Utility Model Laid-Open No. 2-71149. In this transmission, a drive shaft B and a speed change shaft C are supported in parallel in a transmission case A, and a plurality of drive gears D having different gear ratios are fixed to the drive shaft B. A slide shaft H is provided with a plurality of speed change gears G having different gear ratios, which are selectively meshed with each other via a speed changer F operated by a lever E, fixed to the outer peripheral surface. This slide shaft H has a spline formed on its inner peripheral surface, and is slidably fitted in the outer periphery of a hollow shaft J supported by a bearing I in a mission case A, and the hollow shaft J is surrounded by the outer periphery. A spline is formed on the inner surface and the inner peripheral surface, and one end of the transmission shaft C is spline-fitted to the inner peripheral surface.

The other end side of the speed change shaft C is supported by a bearing K provided on a detachable holder M with respect to the transmission case A by a plurality of bolts L, and is located outside the bearing K of the speed change shaft C. A torque limiter T is provided at the end. A bevel gear N is provided on the speed change shaft C in the vicinity of the torque limiter T, a bevel gear O meshing with the bevel gear N is provided, and a PTO shaft P for transmitting power to the working portion is provided. Further, a cover Q that is attachable to and detachable from the holder M by a plurality of bolts R is provided on the outer periphery of the torque limiter T. In addition to performing gear shifting operation by the gear shift lever E, this working unit transmission also removes the bolt L, removes the holder M from the transmission case A, and at the same time removes the torque limiter T and the gear shift shaft C. O and the spring S of the torque limiter T are exchanged so that the rotational speed of the PTO shaft P can be further changed, and the torque limiter T operates properly.

[0004]

[Problems to be solved by the device]

 In the above-described conventional work unit transmission, the holder M and the cover Q are separately configured. Therefore, in order to change the springs S of the bevel gears N and O and the torque limiter T, the holder M and the cover Q are separated. It had to be removed, which was troublesome and took a lot of work time. Further, since the holder M and the cover Q are separately configured, there is a problem that the number of parts increases and the cost increases. The present invention has been made to solve the above problems.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a transmission shaft that is rotatably supported in a transmission case and that transmits power from a drive shaft, and a PTO shaft that is mounted with a bevel gear that meshes with a bevel gear attached to the transmission shaft. A state in which a torque limiter attached to the shaft end of the speed change shaft and a cover bracket covering the outside of the torque limiter are provided, and the speed change shaft bearing is supported by the cover bracket. When the bevel gear attached to the transmission shaft and the bevel gear attached to the PTO shaft are replaced, the cover bracket can be removed from the transmission case so that the transmission shaft can be removed at the same time. And

[0006]

[Action]

 With the above-described structure, the working unit transmission of the mobile agricultural machine according to the present invention removes the cover bracket from the transmission case and takes out the transmission shaft when replacing the bevel gear attached to the transmission shaft and the PTO shaft and the spring of the torque limiter. The springs of the two bevel gears and the torque limiter can be easily replaced. In addition, the reduction in the number of parts reduces the cost and the working time.

[0007]

Embodiment Hereinafter, one embodiment of the present invention will be specifically described with reference to the accompanying drawings. Referring to FIG. 2, a riding type rice transplanter (mobile agricultural machine) 1 to which the present invention is applied has a traveling vehicle body 6 in which an engine 5 is mounted on a front portion of a body frame 4 equipped with a pair of left and right front wheels 2 and rear wheels 3. is doing. A seedling planting section 8 is attached to the rear part of the traveling vehicle body 6 via a vertical link 7 composed of a parallel link and a hydraulic cylinder. A transmission case 9 is provided obliquely below and behind the engine 5 on the traveling vehicle body 6, power is transmitted from the engine 5, the gear is changed, and the four wheels of the front wheel 2 and the rear wheel 3 are driven to travel. Power is transmitted to the seedling planting portion 8 via the working portion transmission shaft 10 to perform seedling transplanting work.

Further, the traveling vehicle body 6 is provided with a steering column 11 and a steering handle 12 located above the mission case 9. Near the steering column 11 and the steering handle 12, although not shown, The main gear shift lever, the sub gear shift lever, the work unit gear shift lever, and the clutch pedal and brake pedal used when the main gear shift lever and the sub gear shift lever are turned on and off are provided. Further, in the front part of the machine body, a removable bonnet 13 covering the engine room accommodating the engine 5, a lower cover 14 arranged below the bonnet 13, and an intermediate portion between the bonnet 13 and the lower cover 14. A headlight 15, a bumper 16 and the like are installed in the vehicle. A driver's seat 17 is provided behind the steering handle 12, and an elevator lever 18 for operating the elevator link 7 is provided at a side portion of the driver's seat 17, and an adjustment lever (not shown) for adjusting the seedling planting portion 8. Etc. are provided.

In the transmission case 9 shown in FIG. 1, a drive shaft 20 which is rotated by power transmission from the engine 5 by a belt transmission mechanism, and a transmission shaft 21 and a shifter shaft 22 which are parallel to the drive shaft 20 are axially supported. The drive shaft 20 is provided with a main clutch 23, a main clutch shifter 24 operated by a foot pedal (clutch pedal), a plurality of drive gears 25 having different gear ratios, and the like. The speed change shaft 21 is provided with a slide shaft 28 having a plurality of speed change gears 27 selectively engaged with each other by the drive gear 25 and the work unit speed change shifter 26 and having different gear ratios fixed to the outer peripheral surface thereof. 28 has a spline formed on the inner peripheral surface thereof, and is slidably fitted in the outer periphery of a hollow shaft 30 supported by a bearing 29 in the mission case 9. The hollow shaft 30 has an outer peripheral surface and an inner surface. A spline is formed on the peripheral surface, and one end of the speed change shaft 21 is fitted on the inner peripheral surface of the spline so as to be insertable and removable.

A torque limiter 31 having a replaceable spring 32 is provided on the other end of the transmission shaft 21, and the torque limiter 31 is covered by a cover bracket 33 on the outer side. The cover bracket 33 is attachable / detachable to / from the mission case 9 with a plurality of bolts 35, and a bearing 34 is internally mounted to support the other side of the transmission shaft 21. Therefore, when the bolt 35 is removed and the cover bracket 33 is held and moved to the right in FIG. 1, the transmission shaft 21 can be pulled out from the hollow shaft 30 and taken out from the mission case 9.

A bevel gear 36 is replaceably attached to the speed change shaft 21, and a bevel gear 37 that meshes with the bevel gear 36 is replaceably provided. It is rotatably supported so as to project to the outside. A clutch 39 is provided on the PTO shaft 38, and the working portion transmission shaft 10 is connected to the tip portion thereof to transmit power to the seedling planting portion 8. A main speed change gear 40 and an auxiliary speed change gear 41 are slidably supported on the shifter shaft 22, respectively, and a main speed shifter 42 and an auxiliary speed change shifter 43 perform a speed change operation. Reference numeral 44 is a traveling back gear that meshes when the main transmission gear 40 is switched to the reverse position.

In the work unit transmission of the mobile agricultural machine having such a configuration, when the riding type rice transplanter (mobile agricultural machine) 1 performs seedling transplanting work, the front wheels 2 and the rear wheels 3 of the traveling vehicle body 6 are driven. A seedling planting operation is performed by the seedling planting section 8 which travels in the field and receives power from the PTO shaft 38 via the working section transmission shaft 10. At this time, when the seedling planting interval is adjusted, the traveling speed of the traveling vehicle body 6 is kept constant, and the slide shaft 28 is moved by the working unit shift shifter 26 so that the gear shift gear 27 and the drive gear 25 mesh with each other. Is changed to change the driving speed of the seedling planting section 8, and in this embodiment, it can be changed in two stages.

However, depending on the type and condition of the seedlings, the field conditions, etc., adjustment may not be sufficient with the above-described two-stage gear shifting. In such a case, the bevel gear 36 of the gear shifting shaft 21 and the PTO shaft may be adjusted. The bevel gear 37 of 38 is replaced with a bevel gear 37 having a different meshing ratio. For example, when increasing the stock pitch, the bevel gears 36 and 37 have 18 and 43 teeth, and when the stock pitch is small, the bevel gears 36 and 37 have 26 and 35 teeth. Replace each one. When the bevel gears 36 and 37 are replaced, the torque value (rotational speed) of the speed change shaft 21 changes, that is, the rotational speed of the seedling planting claws of the seedling planting unit 8 changes, and the inertial force changes. Therefore, it is necessary to change the spring pressure of the spring 32 of the torque limiter 31 to a large one when the pitch between the stocks is reduced and a small one when the pitch between the stocks is increased. It

When the bevel gears 36, 37 and the spring 32 are replaced as described above, the plurality of bolts 35 are removed, the cover bracket 33 is held and pulled rightward in FIG. It can be taken out from the shaft 30 and taken out from the mission case 9 together with the bevel gear 36. Then, the transmission shaft 21 is pulled out from the bearing 34 and the torque limiter 31, the bevel gears 36 and 37 are replaced, the cover bracket 33 is removed from the bearing 34, and the spring 32 is replaced. Then, with the transmission shaft 21 fitted in the bearing 34 and the torque limiter 31, the outer peripheral portion of the bearing ring 34 is fitted in the cover bracket 33, and the shaft end portion of the transmission shaft 21 is spline fitted in the hollow shaft 30. Then, the cover bracket 33 is attached to the mission case 9 with the bolts 35 to assemble, and the work is completed.

[0015]

[Effect of the device]

 As described above, according to the working unit transmission of a mobile agricultural machine according to the present invention, when replacing the bevel gear attached to the speed change shaft and the bevel gear attached to the PTO shaft, the cover bracket is removed from the mission case to change the speed. Since the shaft can also be removed at the same time, the torque limiter cover and the transmission shaft bearing support were conventionally composed of two separate members. However, the structure is simplified and the cost is reduced. It is compact and compact, and it is easy to attach to and detach from the mission case. Also, the bevel gear attached to the speed change shaft and the bevel gear attached to the PTO shaft can be easily replaced, and further, the spring of the torque limiter can be easily replaced.

[Brief description of drawings]

FIG. 1 is a developed cross-sectional view showing a main part of the present invention.

FIG. 2 is a side view of the entire riding type rice transplanter (mobile agricultural machine) to which the present invention is applied.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Riding type rice transplanter (mobile agricultural machine) 2 Front wheel 3 Rear wheel 4 Machine frame 5 Engine 6 Traveling machine 7 Lifting link 8 Seedling planting section 9 Mission case 10 Working section transmission shaft 11 Steering column 12 Steering handle 13 Bonnet 14 Lower cover 15 Headlight 16 Bumper 17 Driver Seat 18 Lifting Lever 20 Drive Shaft 21 Shift Shaft 22 Shifter Shaft 23 Main Clutch 24 Main Clutch Shifter 25 Drive Gear 26 Working Gear Shift Shifter 27 Shift Gear 28 Slide Shaft 29, 34 Bearing 30 Hollow Shaft 31 Torque limiter 32 Spring 33 Cover bracket 35 Bolt 36, 37 Bevel gear 38 PTO shaft 39 Clutch 40 Main transmission gear 41 Sub transmission gear 42 Main transmission shifter 43 Sub transmission shifter 44 Traveling back gear

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Yukio Kato 667 Isuyacho, Higashi Izumo-cho, Yatsuka-gun, Shimane Prefecture 1 Inside Mitsubishi Agricultural Machinery Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A transmission shaft, which is rotatably supported in a transmission case and receives power from a drive shaft, and a PTO shaft having a bevel gear that meshes with a bevel gear mounted on the transmission shaft.
The transmission includes a torque limiter attached to the shaft end of the transmission shaft, and a cover bracket that covers the outside of the torque limiter. The transmission bracket is provided with a bearing support portion for the transmission shaft to support the transmission shaft. Attached to the case,
When exchanging the bevel gear attached to the transmission shaft and the bevel gear attached to the PTO shaft, the cover bracket can be removed from the mission case so that the transmission shaft can be removed at the same time. Gearbox.