JPS6322104A - Gear transmission apparatus - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a gear transmission, and in detail,
This relates to an intermediate gear transmission device that is located between a gear on the driving side and a gear on the driven side to change the speed or change the direction of one rotation.6 [Prior art and its problems] It is well known that a motor is provided with two intermediate gears in order to change the speed or the direction of rotation.

However, with this conventional transmission device, when power is transmitted from the driving gear to the driven gear, the driven gear has a considerable amount of play in the rotational circumferential direction due to the backlash of each gear. However, it was not possible to transmit power without allowing the gear on the driven side to play with respect to the gear shaft on the driving side.

[Technical means to solve problems]

This invention takes the first technical means to solve the problems of the prior art described above.

That is, the present invention provides a method in which at least two or more gears 32a, 32b having the same pitch diameter and the same number of teeth are joined to each other, and the tooth portions are slightly shifted from each other in the rotational circumferential direction. Collapse gear 32a.

An elastic body 33 is interposed between the gears 32b, and each gear 32a,
32b is an intermediate gear transmission mounted to freely rotate with respect to the support shaft 34.

[Function and effect of the invention]

According to this invention, when the driving gear and the counter gear, and the counter gear and the driven gear mesh with each other to transmit power, the teeth of the gears 32a and 32b are offset from each other in the circumferential direction. both gear 3
When the drive-side gear and the driven-side gear mesh with the gears 2a and 32b, the teeth of the gears 32a and 32b are pushed apart in the rotational circumferential direction and mesh with each other, thereby transmitting power without causing play.

Therefore, compared to methods that apply rotational resistance to the driven side gear or counter gear to eliminate backlash, the power transmission resistance is reduced, and the driven side gear can be accurately transmitted without letting it play in the rotational circumferential direction. It has the effect of being able to rotate.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS A transmission device for a transplanter which is an embodiment of the present invention will be described in detail based on the drawings.

Reference numeral 1 is a passenger towing vehicle, in which a front transmission case 3 and a rear transmission case 4 are provided below a flat control step floor 2, and a front axle case is installed on both left and right sides of the rear side of the front mission case 3. A pair of left and right front wheels 5°5 are provided to be rotated by transmission, and transmission cases 6.6 are provided on both left and right sides of the rear transmission case 4.
, the rear wheels 7, 7 are installed, and the step floor 2 is installed.
A frame body 8 for attaching an operating lever etc. is provided upright on the front part of the frame body 8, and a handle 9 is provided to this via a steering post,
A cover 11 covering an engine 10 is provided behind a handle 9, and a control seat 12 is mounted on the cover 11.

Reference numeral 13.13 denotes columns, which are erected on the connecting frame 14 connecting the left and right transmission cases 6.degree. 6 at a predetermined interval from side to side.

Reference numeral 15 is a lifting link, and a pair of left and right lower links 15a, 15
a and the base side of the single upper link 15b is the support column 13.1.
3 via a pin, the distal end side is connected by a vertical link 16, and the elevating link 15 is configured to be moved up and down by a hydraulic cylinder device 17.

Reference numeral 18 denotes a transplanting machine, which is made up of a transmission case 19, a seedling tank 20 that reciprocates from side to side, a transplanting device @21, and soil leveling floats 22, 23, 23, etc. at the center and sides. is attached to a supporting body 24 integral with the vertical link 16 via a support shaft 25 so as to be able to roll freely. The transmission case 19 includes a main transmission case 19a, sub-transmission cases 19b, 19b, 19b extending vertically, and vertical transmission cases 19c, 19c, 19c extending rearward.

Reference numeral 26 denotes a seedling receiving frame, which extends laterally along the lower end of the seedling tank 20, and has a seedling dividing opening 27° 27 through which the seedlings placed in the seedling tank 2o can be divided.・We have established.

The transplant device 21 is composed of the following members. That is, a drive shaft 28 protruding outward and laterally is mounted on the longitudinal transmission case 19c so as to be rotated as appropriate, and the distal end of the drive shaft 28 is provided in a square shape. and,
A rotating case 29 is attached to this drive shaft 28. The rotating case 29 is attached by fitting the square shaft portion 28a on the front end side of the drive shaft 28 so that the rotating case 29 is rotated integrally with the drive shaft 28. 30 is fixed metal,
The base is fixed to the transmission case 19 with bolts 30b, and the rotation case 29 is wrapped around the drive shaft 28.
Its tip side extends to the inside. An engaging portion (claw) 30c is provided on the distal end side of the fixed metal 30. 31 is a sun gear as an example of a gear on the drive side,
A boss portion of this gear 31 is fitted onto the drive shaft 28,
An engaging portion (claw) 31a is provided on the − side, and the engaging portion 31a and the engaging portion 30c of the front fixed metal 30 engage with each other, preventing the sun gear 31 from rotating and allowing the rotating case 29 to rotate.
It is designed to fit inside.

The sun gear 31 is provided so that its center is eccentric with respect to the axis A of the drive shaft 28.

A ball bearing 56 is provided between the outer surface of the engaging portions 30c and 31a and the rotating case 29, and is provided to maintain the proper posture of the sun gear 31 and the rotating case 29. It is being

32.32 is a counter gear that meshes with the sun gear 31 and is rotated by the rotation of the rotating case 29, and this counter gear 32 consists of two gears 32a and 32b having the same pitch diameter and the same number of teeth. The two gears 32a, 32
A rubber ball as an elastic body 33 is fitted between the seams b by drilling holes (c) and (d) in the sides of both gears.

Both gears 32a and 32b are rotatably attached to the support shaft 34, and the case 2 is fixed so as not to move outward.
A collar 35.35 is interposed between it and 9.

36. 36 is a planetary gear as a driven gear integrally provided with a cylindrical shaft 37, and a bearing 56 is attached to the case 29.
．． A cylindrical shaft 37 is rotatably provided at 56, and this gear 36 meshes with the counter gear 32.

In this meshing state, the teeth of the planetary gear 36 mesh with the teeth of the two gears 32a and 32b at the same time, the teeth of the planetary gear 36 are between the teeth of the gears 32a and 32b, and the elastic body 33
They are pressed together by the distortion of the two.

Reference numeral 38 denotes a rod for operating the transplanted claw of the transplantation tool, which passes through the inside of the cylindrical shaft 37 and has a cam floor 38 on its base side.
a is provided integrally.

A cam 39 is integrally provided on the inner surface of the rotary case 29, and the cam floor 38a is pressed against the cam by a spring 40, and the cam 39 causes the rod 38 to reciprocate. It is structured to do this. Note that the rod 38 is wedged so as to be integral with the cylindrical shaft 37 in the rotational direction.

Reference numeral 4o denotes a transplant tool, which includes a transplant claw 43a fixed to a transplant case 40a and a movable transplant claw 43b fixed to a transplant case 40a fixed with bolts 43 and 43 to a metal fitting 42 fixed to the distal end side of the cylindrical shaft 37 with a knot turbine 41. The structure is set up.

The movable transplant claw 43b has a supporting shaft 44 which is a body of the movable transplant claw 43b and is rotatably supported by the transplant case 40a, with a spring 45 interposed between the shaft 44 and the case 40a. The transplanted nail 43b is flipped in the opposite direction to the fixed transplanted nail 43a.

Further, an arm 46 is fixedly attached to this shaft 44, and a screw 47 with a flat head is screwed onto the arm 46, and the tip of the rod 38 is configured to come into contact with the head of this screw 47. The reciprocating movement of the rod 38 causes the transplanted claw 43b to reciprocate and rotate, thereby varying the distance from the fixed transplanted claw 43a. Note that the embodiment is configured so that the interval setting of the transplanted nails can be adjusted using the screws 47.

In addition, 48 is a lid made of rubber.

Next, to explain the operation of the upper side, when seedlings are placed in the seedling tank 2o and each part is driven by the engine 1o, the passenger tractor 1 is propelled by the rotation of the front shaft 5 and rear wheels 7, and the transplanter 1
The load is partly received by the earth leveling floats 22, 23, and 23, and the power is transmitted from the front transmission case 3 side to the input shaft in the transmission case 19 via the transmission shaft. In this way, power is transmitted from the input shaft inside the transmission case 19 to the drive shaft 28 via an appropriate transmission route. Then, each rotating case 29 rotates, and with this rotation, a counter gear 3 is formed around the sun gear 31.
2.32 is planetarily rotated, and the planetary gears 36 and 36 that mesh with this are also rotated.

At this time, the counter gears 32 and 32 are each divided into two gears 32a and 32b, and the tooth surfaces are slightly shifted in the circumferential direction, and the interval t1 formed between the teeth of gear 32a and the teeth of gear 32b is Alternatively, the tooth spacing of the gear 32b is smaller because it is deviated from 2, and the other sun gear 31 and the planetary gear 36°36 mesh with this smaller portion. During this meshing, the elastic body 33 is distorted, and the substantially narrow gap between the teeth is expanded to transmit power, thereby reliably eliminating rattling due to backlash.

In this way, the planetary gear 36 is accurately rotated without rattling, and although the number of rotations is the same with respect to the rotation of the rotating case 29, it is rotated faster when the rotational circumferential speed is high and slower when the rotational peripheral speed is high. .

Therefore, the metal fitting 42 is rotated via the cylindrical shaft 37 that is integrated with the planetary gear 36, and the transplant case 40 is rotated together with the metal fitting 42.
a is activated. The tips of the fixed and movable transplant claws 43a and 43b attached thereto draw a long loop-shaped transplant locus P in the vertical direction when viewed individually.

Furthermore, the movable transplanted claw 43b is connected to the cam 39 and the cam floor 38.
It is operated intermittently via a rod 38 marked with a.

That is, although its operation is determined by the shape of the cam 39,
At the time of seedling separation when 8a, 38b intervenes in the seedling dividing opening 27, the interval between both claws 38a, 38b is slightly narrowed, and thereafter a constant interval is maintained, and the interval widens when the nails 8a, 38b enter the soil surface. Therefore, the seedlings in the seedling tank 2o are reliably separated from the seedling dividing opening 27 of the seedling receiving frame 26 by the fixed transplanting claws 38a and the fixed transplanting claws 38b, and are transplanted to the lower soil surface.

At the time of such transplantation, the structure of the counter gear 32 reliably eliminates backlash caused by backlash, so that the operation of the movable transplant claw 38b when dividing the seedling from the seedling dividing opening 27 is reduced. The seedlings can be divided reliably without any problems, the timing of releasing the seedlings at the time of transplanting is maintained accurately, and the transplant trajectory P of the transplanted nails does not change, so that the seedlings are transplanted in a predetermined suitable posture. .

[Brief explanation of the drawing]

The drawings show a gear transmission in a rotary transplanting device for a rice transplanter, which is an embodiment of the present invention. A plan sectional view when disassembled, Fig. 4 is a side view, Fig. 5 is a slope view of the main part, Fig. 6 is a front view of the main part, Fig. 7 is a side view of the whole, and Fig. 8 is its plane. It is a diagram. In the figure, 32 is a set of gears, 32a and 32b are gears during disassembly, 33 is an elastic body, and 34 is a support shaft.

Claims (1)

[Claims] At least two or more gears 32a and 32b having the same pitch diameter and the same number of teeth are joined together, and
An intermediate gear in which an elastic body 33 is interposed between the gears 32a and 32b with tooth portions slightly shifted from each other in the rotation circumferential direction, and each of the gears 32a and 32b is mounted so as to freely rotate with respect to its support shaft 34. Transmission device.