JPH09152000A - Gearbox for passenger rice transplanter - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To simplify the assembly work and the management work of a transmission gear. A drive shaft having a plurality of drive-side speed change gears fixed coaxially and attached thereto and a cylindrical driven shaft having a plurality of driven-side speed change gears coaxially and freely attached thereto are arranged in parallel. Then, the drive-side transmission gears and the driven-side transmission gears that face each other are constantly meshed with each other, and a ball-key accommodation hole is formed at each transmission gear mounting position of the driven shaft. While freely accommodating, insert the speed change operation rod into the driven shaft, and push out a part of each ball key from the ball key accommodating hole by the ball key pushing piece provided in the middle of the speed change operation rod. In a transmission system of a passenger rice transplanter in which any one of the driven side transmission gear and the driven shaft can be selectively interlocked by engaging with the inner peripheral surface of the driven side transmission gear, a driving side transmission gear and a driven side transmission gear are provided. Inward on the inner surface of the transmission gear A semi-circular concave key engagement recess,
It was formed in the same shape and the same size.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transmission device for a riding rice transplanter.

[0002]

2. Description of the Related Art Conventionally, a drive shaft having a plurality of drive-side transmission gears fixed coaxially thereto and a plurality of driven-side transmission gears can be coaxially idled as one form of a transmission device for a passenger rice transplanter. The parallel drive shaft and the driven shaft that are mounted on the drive shaft and the driven drive gear that face each other are always meshed with each other, and there is a ball key hole at each drive gear mounting position on the driven shaft. The ball key is housed in each ball key accommodating hole so that it can be moved back and forth, and the speed change operation rod is inserted into the driven shaft. Part of which is pushed out of the ball-key accommodating hole and engaged with the inner peripheral surface of each driven speed change gear to enable selective interlocking of one driven speed change gear and driven shaft. There is.

[0003]

However, in the above-described transmission device, when the structure is capable of shifting in multiple stages, there are many types of drive-side transmission gears and driven-side transmission gears. The work and the management work were complicated.

[0004]

In view of the above, in the present invention, a drive shaft having a plurality of drive side transmission gears coaxially fixed and attached thereto, and a plurality of driven side transmission gears coaxially and freely attached thereto. By arranging the cylindrical driven shaft in parallel with each other, the respective drive-side transmission gears and the driven-side transmission gear that face each other are constantly meshed with each other, and a ball key accommodation hole is formed at each transmission gear mounting position of the driven shaft. The ball keys are housed in the ball key housing holes so that they can move back and forth, the speed change operation rod is inserted through the driven shaft, and a part of each ball key is pushed out by the ball key pushing piece provided in the middle of the speed change operation rod. A passenger rice transplanter in which any one of the driven transmission gears and the driven shaft can be selectively interlocked by being pushed out from the ball key accommodation hole and engaged with the inner peripheral surface of each driven transmission gear. In the transmission,
In the rice transplanter of the present invention, the key engaging recesses having a semi-circular concave shape are formed inwardly on the inner peripheral surfaces of the drive side transmission gear and the driven side transmission gear, respectively, in the same shape and in the same size. It is intended to provide a transmission.

Further, according to the present invention, the drive side speed change gear is engaged with the drive shaft in the rotating direction by the round bar key through the key engaging recess, and the diameter of the round bar key is the diameter of the ball key. It is also characterized in that it is formed substantially the same as.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 shows a riding rice transplanter according to the present invention. The riding rice transplanter A has a planting section 2 at the rear of a traveling section 1 which is capable of self-propelling and an elevating link mechanism 3. The planting part 2 can be lifted and lowered by a lifting hydraulic cylinder 4.

As shown in FIGS. 1 and 2, the traveling section 1
An engine 11 is provided at a front portion of the body frame 10, and an operating portion 12 is provided at a rear portion.

Then, the mission case 13 is attached to the lower part of the front part of the body frame 10 by interlocking with the engine 11.
Left and right front axle cases 15 and 15 are provided to project laterally outward from the left and right sides of the mission case 13, and front wheels 16 and 16 are attached to the tips of the cases 15 and 15.

A rear axle case 17 is attached to the rear portion of the machine body frame 10, and rear wheels 18, 18 are attached to the left and right ends of the rear axle case 17, respectively.

The transmission case 13 and the rear axle case 17 are interlockingly connected via a transmission shaft (not shown).

As shown in FIGS. 1 and 2, a casing body 20 having left and right step portions, a floor surface portion, a seat support portion, and left and right rear fender portions is stretched on the body frame 10. The casing body 20 is integrally molded of synthetic resin having high rigidity such as FRP.

A bonnet 21 is provided at the center of the front side of the casing body 20.
And a fuel tank 22 arranged directly above the engine 11,
The steering shaft 23 of the driving unit 12 described later is covered.

Further, the above-mentioned operation unit 12 is shown in FIG. 1 and FIG.
As shown in FIG. 3, a steering shaft 23 is erected immediately after the engine 11, a handle 24 is attached to the upper end of the steering shaft 23, and a seat 26 is formed at the rear of the handle 24 and a seat 26 is formed at the rear of the casing body 20. It is installed directly on the 20a.

Reference numeral 30 is a clutch pedal arranged on the left side of the hood 21, 31 is a brake pedal arranged on the right side of the bonnet 21, and 32 is a shift lever arranged on the left side of the seat 26. , 33 are auxiliary shift levers arranged on the right side of the seat 26.

The planting section 2 is, as shown in FIGS. 1 and 2,
The center float 41 and the left and right side floats 42, 42 are arranged below the planting mission case 40, and the seedling mounting table is mounted on the planting mission case 40 in a tilted posture of front, rear, rear, and low.
43 is placed, and a pair of planting claws 44, 44 are attached to the rear end of the planting mission case 40 via a rotary case 45.

The planted mission case 40 is shown in FIG.
As shown in, the transmission case 1 of the traveling unit 1 is interlockingly connected to the transmission case 46 through a planted transmission shaft 46 extending in the front-rear direction. An inter-stock transmission case 47 as a transmission is provided at the position, and the inter-stock transmission case 47 has a mounting bracket shown in FIG.
It is attached to the body frame 10 via 84.

As shown in FIGS. 1 and 3 to 5, the inter-stock transmission case 47 includes a case body 50, a front half case formation body 51 and a case body 50.
And the latter half case forming body 52 are divided into two and are formed by connecting bolts.
It is separable and connectable via 85, and upper and lower bearing parts 51a, 51b, 52a, 52a, 52a,
52b, and the lower bearing portion 51b of the front half case forming body 51 is formed.
The input shaft 53 as a drive shaft with the axis lined in the front-rear direction is attached to the front end portion 53a of the input shaft 53, and the front end portion 53a of the input shaft 53 is projected forward to interlock with the upstream side of the planted transmission shaft 46 through the connecting body 54 At the same time, the fitting projection 53b is formed at the rear end of the input shaft 53, while the output shaft 55 having the axis line oriented in the front-rear direction is attached to the lower bearing portion 52b of the rear half case forming body 52. A fitting recess 55 that fits with the fitting projection 53b of the input shaft 53 at the front end of the output shaft 55.
While forming a, the rear end portion 55b is projected rearward and interlockedly connected to the downstream side of the planted transmission shaft 46 via a connecting body 56,
The planted transmission shaft 46, the input shaft 53, and the output shaft 55 are arranged on the same axis.

The input shaft 53 is, as shown in FIGS. 3 and 5, a semi-arc concave key groove extending in the axial direction on the circumferential surface.
Six 57 are formed at equal intervals in the circumferential direction, while the first, second, third, and fourth drive-side speed change gears 58, 59, 60, 61 are fitted on the outer peripheral surface of the input shaft 53. Change gear 58,59,6
Key engaging recesses 58a, 59a, 60a, 61a in the shape of semi-circular recesses facing the key groove 57 are formed on the inner peripheral surface of 0, 61 at equal intervals in the circumferential direction. Insert the round bar key 62 into the groove 57 and the key engaging recesses 58a, 59a, 60a, 61a to engage the transmission gears 58, 59, 60, 61 with the input shaft 53 in the rotational direction. There is. 63, 64, 65 are spacers, and 66, 67 are gear locking rings.

As shown in FIG. 3, the output shaft 55 has an output gear 68 integrally formed on its outer peripheral surface.

As shown in FIG. 3, between the upper bearing portion 51a of the front half case forming body 51 and the upper bearing portion 52a of the rear half case forming body 52, there is a tubular shape as a driven shaft extending in the front-rear direction. The inter-share speed change shaft 70 is mounted at a position directly above the input / output shafts 53, 55 with their axes parallel to each other.
As shown in FIG. 5, six ball key accommodation holes 71 are formed at equal intervals in the circumferential direction, and five hole key accommodation holes 71 are also provided at intervals in the axial direction. Formed,
While the ball keys 72 are housed in the ball key housing holes 71 so as to be able to move back and forth, five sets of the ball key housing holes 71, 71, 71, 71, 71,
First, second, third, fourth and fifth driven side speed change gears 73, 74, 75, 76 and 79 are rotatably loosely fitted to the outer peripheral surface where 71 is located, and the first and second・ Third and fourth driven gears 73,74,
75,76 are always meshed with the opposing first, second, third, and fourth drive side transmission gears 58,59,60,61, and the fifth driven side transmission gear 79 is always meshed with the output gear 68. ing.

Key engaging recesses 73a, 74a, 75a, 76a, 79a are formed on the inner peripheral surface of each transmission gear 73, 74, 75, 76, 79 in the shape of a semi-circular recess facing the ball key receiving hole 71. ing.

Moreover, as shown in FIGS. 3 and 5, the gear shift operating rod 77 is slidably inserted into the inter-stock gear shift shaft 70, and the ball key pushing piece is inserted in the middle of the gear shift operating rod 77.
78 is formed, and each ball key 72 is extruded from the ball key accommodating hole 71 to the outside by the same ball key extruding piece 78,
One of the driven side transmission gears 73, 74, 75, 76 is engaged with the key engagement recesses 73a, 74a, 75a, 76a, and the driven side transmission gear and the stock transmission shaft 70 of the engaged key engagement recesses are engaged. It is possible to interlock by connecting and.

The fifth driven transmission gear 79 is always connected to the inter-stock transmission shaft 70 by the ball key 72 which is constantly extruded by the ball key extruding cylinder 86 fitted to the rear end of the inter-stock transmission shaft 70. It works together.

Here, the first, second, third and fourth drive side transmission gears 58,59,60,61 and the first, second, third, fourth and fifth driven side transmission gears 73,74. , 75, 76, 79 are formed to have the same shape and the same size as each other, and the diameter of the ball key 72 and the diameter of the round bar-shaped key 62 engaged with these are substantially the same. It has a diameter.

In this way, the speed change gear can be shared by both the driving side and the driven side, the type of speed change gear to be used can be halved, and the work of assembling and managing the speed change gear can be performed. I am trying to simplify it.

Moreover, the ball key 72 and the round bar key 62 can ensure a good power transmission function between each shaft and each transmission gear.

Further, as shown in FIGS. 3 and 4, a lever stay 80 extending rearward is attached to the bottom of the latter half case forming body 52, and the lever stay 80 extends vertically in the front end thereof. The lower end of the right and left bifurcated stock shift lever 81 is pivotally supported by a pivot pin 82 whose axis is oriented in the left-right width direction,
The stock shift lever 81 is swingable back and forth, and the rear end portion of the gear shift operation rod 77 is connected to the midway portion of the stock shift lever 81 by a connecting pin 83 to shift the stock shift lever 81 back and forth. The front and rear sliding movements of the rod 77 are interlocked with each other to enable engagement / disengagement of the driven side transmission gear and the stock transmission shaft 70 by the ball key 72 via the ball key pushing piece 78. Reference numeral 81a is a bulging portion for avoiding axial interference.
This avoids interference with the output shaft 55.

Further, as shown in FIGS. 4 and 5, the mounting bracket 84 includes a lever guide body extending rearward.
84a is integrally molded to form a lever guide groove 84b in the lever guide body 84a, and four lever locking projections 84c are formed in the lever guide groove 84b so as to coincide with the gear shift operation position of the inter-stock shift lever 81. Are protruded at intervals in the front-rear direction, and locking holes 81b formed at the upper end of the inter-stock shift lever 81 can be locked to the lever locking projections 84c.

In the present embodiment, the gear shift operation lever 81 is arranged rearward of the inter-stock shift case 47, but it may be arranged in front of the inter-stock gear shift case 47, if necessary, to obtain the same effect as the above. Can be obtained.

The embodiment of the present invention is constructed as described above, and according to this embodiment, the stock change case 47 is used.
Is provided in the middle of the planted transmission shaft 46, the degree of freedom of the arrangement position of the inter-stock transmission case 47 is increased, and the transmission case 47 is appropriately arranged at a position where it can be easily operated by the driving unit 12 of the traveling unit 1. As a result, it is possible to improve the operability between stock changes, and also to improve the front-rear balance of the machine body, thereby improving the traveling property and stability of the machine body.

At this time, the input / output shaft 5 of the stock change gear case 47
Since 3,55 are arranged on the same axis in the front-back direction,
Whether the transmission case 47 is attached to the planted transmission shaft 46 in the middle or not, the input / output shafts 53, 55 are attached to and detached from the planted transmission shaft 46 via the connecting bodies 54, 56. Only by doing so, it is possible to easily take a response according to the taste of the user.

The inter-stock shifting lever 81 can be compactly arranged immediately behind the inter-stock shifting case 47, and the inter-stock shifting operation can be reliably performed via the gear shifting operation rod 77. When the upper end of the gear shift lever 81 is arranged in the vicinity of the seat 26 of the driving unit 12,
The operator can perform the inter-stock shifting operation while seated on the seat 26, and the inter-stock shifting operability can be further improved.

Also, the case body 50 of the inter-stock shifting case 47
Is divided into a front half case formation body 51 and a rear half case formation body 52 so as to be separable and connectable. Therefore, by separating both case formation bodies 51 and 52, Maintenance can be performed easily.

[0035]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, key engaging recesses each having a semicircular arc concave inward are formed in the inner peripheral surfaces of the drive-side speed change gear and the driven-side speed change gear in the same shape and in the same size. Since the two transmission gears are formed and shared, the types of both transmission gears can be reduced to half, and the assembly work and management work of the transmission gears can be simplified.

According to the second aspect of the present invention, the drive-side speed change gear is engaged with the drive shaft in the rotating direction by the round bar-shaped key through the key engaging recess, and the diameter of the round bar key is the ball. Since the key diameter is formed to be approximately the same as that of the key, it is possible to share the drive-side transmission gear and the driven-side transmission gear, and the drive-side transmission gear can be securely engaged with the drive shaft. As a result, the power transmission function can be well ensured.

[Brief description of the drawings]

FIG. 1 is a side view of a riding rice transplanter.

FIG. 2 is a plan view of the same rice transplanter.

FIG. 3 is a sectional side view of an inter-stock shift case.

FIG. 4 is a rear view of the inter-stock shift case.

FIG. 5 is an end face explanatory view of the input shaft and the stock-gear shifting shaft.

[Explanation of symbols]

 A Passenger rice transplanter 1 Running part 2 Planting part 3 Lifting link mechanism 4 Shift case between stocks

Claims (2)

[Claims] 1. A drive shaft, to which a plurality of drive-side speed change gears are coaxially fixed and attached, and a cylindrical driven shaft, to which a plurality of driven-side speed change gears are coaxially and freely rotatable, are arranged in parallel. The drive-side transmission gear and the driven-side transmission gear that face each other are always meshed with each other, and a ball-key accommodation hole is formed at each transmission gear mounting position of the driven shaft, and a ball-key is accommodated in each ball-key accommodation hole. While accommodating in a retractable manner, insert the speed change operation rod into the driven shaft, and push out a part of each ball key from the ball key accommodation hole to the outside by the ball key pushing piece provided in the middle of the speed change operation rod. In the transmission system of a passenger rice transplanter in which any one of the driven transmission gears and the driven shaft can be selectively interlocked by engaging with the inner peripheral surface of each driven transmission gear, On the inner peripheral surface of the side gear To the semicircular arc concave key engaging recesses, the same shape and, transmission of riding rice transplanter, characterized in that formed at the same size. 2. The drive-side speed change gear is engaged with a drive shaft in a rotating direction by a round bar key through a key engaging recess, and the diameter of the round bar key is substantially the same as the diameter of the ball key. The transmission device for a riding rice transplanter according to claim 1, wherein the transmission device is formed.