JPH0338976Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention is a transmission device for adjusting the distance between planted plants that can change the distance between plants (pitch between plants) in four or more stages in a planting work machine such as a rice transplanter. It is related to.

(Conventional technology) In rice transplanters and other planting machines, the distance between plants is generally divided into several types, such as 12 cm, 14 cm, 16 cm, 18 cm, and 24 cm, depending on the variety of seedlings to be planted, weather conditions, field conditions, etc. It is set. However, there are almost no conventional machines that are configured to accommodate all of the several types of spacing sizes, and are generally configured with three speeds: large, medium, and small. There is (for example, Utility Model Publication No. 1623, 1983).

(Problem that the invention aims to solve) Therefore, if it is not possible to deal with changes between stocks, it is unavoidable to replace the transmission bevel gear in the transmission case with a separate one, or change the pulley of the transmission belt to a compatible diameter. This was dealt with by exchanging items, but these exchange operations were troublesome and time consuming, and there was a desire for multi-stage separation between plants.

(Means for solving the problem) Therefore, the present invention provides four or more fixed gears G ₁ , G _{2 . .} . G ₂ ...The first idling gear and the second idling gear, which are always in mesh with the fixed gears G ₁ and G _o located at both ends of G _o and have a clutch part, are only rotatable on the planting drive shaft. A clutch portion is provided between the first idling gear and the second idling gear, which selectively engages with the clutch portions of both of these idling gears, and a clutch portion is provided between the intermediate fixed gear G ₂ ...G _o-1. The above-mentioned problem is solved by disposing shift gears configured to mesh with each other so as to be slidable only in the axial direction.

(Function) The power input from the engine to the main shaft of the transmission is transmitted to the planting drive shaft through the transmission mechanism inside the transmission, but in this invention, the shift gear on the planting drive shaft is simply slid in the axial direction. The distance between the stumps can be changed with a single touch by the number of fixed gears arranged in parallel on the main shaft, making it possible to change the speed between the stumps in four or more stages.

(Example) FIG. 1 shows a riding rice transplanter as an example of a planting machine. Reference numeral 1 denotes a riding traveling section, and 2 denotes a planting section. The planting section 2 is attached to the riding traveling section 1 so as to be movable up and down by a mounting device 3, thereby configuring a riding rice transplanter. The passenger traveling section 1 has a pair of left and right front wheels 4 and a rear wheel 5 at the front and rear thereof, an engine 6 is mounted on the front part, and a transmission 7 is provided above between the front wheels 4 and 4. There is. The input shaft (main shaft) 8 of the mission 7 and the output shaft 9 of the engine 6 are interlocked by a transmission belt 10, and 11 is a tension clutch thereof. 12 is a transmission case, 13 is a driver's seat, and 14 is a steering wheel.

Figure 2 shows an example of the structure of a 4-speed gearbox.
On the main shaft 8 of the transmission 7, there are four
Fixed gears G ₁ , G ₂ , G ₃ , and G ₄ are arranged in parallel, and the numbers of teeth of these fixed gears G ₁ , G ₂ , G ₃ , and G ₄ are, for example, 18, 16, and 14, respectively. , set to 12 images,
Further, the intermediate fixed gears G ₂ and G ₃ are configured as shifted gears. 15 is a planting drive shaft, and the planting drive shaft 1
Clutch portions 16a and 17a are provided on the inner surface of the upper portion of the clutch portion 5, respectively.
A first idling gear 16 and a second idling gear 17 having
are provided so as to be rotatable only, and the first idling gear 16 and the second idling gear 17 are always in mesh with the fixed gear _G1 and the fixed gear _G4 , respectively. Between the first and second idling gears 16 and 17 is a shift gear 1 that selectively meshes with intermediate fixed gears G ₂ and G ₃ .
8 is disposed so as to be slidable only in the axial direction, and the shift gear 18 has clutch portions 18a on both sides thereof that selectively engage with the clutch portions 16a, 17a of the first and second idle gears 16, 17. are doing. 19
19a is a shifter integrated with the shift lever; 19b is a steel ball for positioning which is always urged toward the lever 19 side by a spring 19c; There is.

The number of teeth of the first and second idling gears 16, 17 and the shift gear 18 is, for example, 35, 36,
It is set to 35 pieces.

FIG. 3 shows the transmission system of the transmission 7 and its related mechanisms. Reference numeral 20 denotes a hydraulic pump constituting the hydraulic mechanism, and this hydraulic pump 20 is interlocked with a hydraulic mechanism drive shaft 21 that is belt-transmitted to the engine 6 side. has been done. 22 is a front wheel drive shaft, 23 is a rear wheel drive shaft, 23a is a transmission shaft to the rear wheels 5, 24 is a torque limiter, and 25 is a transmission shaft to the planting part 2.

In the figure, 26 is a hydraulic cylinder for raising and lowering the planting section, 27
28 is a seedling stand, and 28 is a planting rod.

In the configuration as described above, when the shift lever 19 is pulled to engage the clutch portion 18a of the shift gear 18 with the clutch portion 16a of the first idle gear 16 from the state shown by the solid line in FIG. The power input to the main shaft 8 by transmission is transmitted to the planting section 2 via the fixed gear G ₁ , the first idling gear 16 , the shift gear 18 , the planting drive shaft 15 , and the transmission shaft 25 in this order. In this state, the pitch between the plants is small. Next, press the gear shift lever 19 to shift the shift gear 18 to the fixed gear as shown by the solid line.
When engaged with G ₂ , the speed is shifted to a slightly medium pitch,
Further, when the lever 19 is pushed and the shift gear 18 is brought into mesh with the fixed gear _G3 , the gear is shifted to middle pitch. Further, when the shift gear 18 is clutch-engaged with the second idling gear 7, the speed is changed to a large pitch.

In this way, the shift gear 18 is shifted to the first idling gear 16.
1 stage by engaging the clutch, 1 stage by meshing with the fixed gear G ₂ of the main shaft 8, 1 stage by meshing with the fixed gear G ₃ of the main shaft 8,
By engaging the second idling gear 17 with the clutch, it becomes possible to change the speed of the first speed and the pitch between the planted plants to a total of four speeds.

In addition, in the above embodiment, a four-speed transmission was explained due to the restriction of shifted gears between the two axes and the difference between the stocks, but the shift gear 1
8 and the fixed gear on the main shaft 8 to increase the number of gears, it is possible to achieve a multi-stage transmission of four or more stages.

(Effects of the invention) As mentioned above, the invention has four or more fixed gears G ₁ , G ₂ each having a different number of teeth on the main shaft of the transmission.
...G _o are arranged in parallel, and these fixed gears G ₁ , G ₂ ... A first idling gear and a first idling gear that constantly mesh with the fixed gears G ₁ and G _o located at the side ends of G _o and have a clutch part, respectively. Two idling gears are provided on the planting drive shaft so as to be rotatable only, and a clutch part is provided between the first idling gear and the second idling gear to selectively engage with the clutch parts of these two idling gears. In addition, a shift gear configured to selectively mesh with the intermediate fixed gear G ₂ ...G _o-1 is arranged so as to be slidable only in the axial direction, so that the first and second idling gears and both ends on the main shaft are connected to each other. By meshing the fixed gears located at By making a difference in number, it is possible to obtain a multi-stage speed change of four or more stages for adjusting between plants. Moreover, multi-stage transmission is possible with a minimum number of shafts, and the gears can be shifted only by linear movement on the planting drive shaft, so the entire structure of the transmission for adjusting plant spacing can be made simple and compact. It has the advantage that it can be provided at low cost. Further, although the gears are configured to have four or more gears, each gear is efficiently combined with each other, so there is an advantage that there is no need to make the transmission case particularly wide.

[Brief explanation of the drawing]

Fig. 1 is an overall side view of a riding rice transplanter equipped with the present invention, Fig. 2 is a sectional view of the main parts, and Fig. 3 is an exploded view showing the transmission system of the transmission and related mechanisms. In the figure, 7 is a transmission, 8 is a main shaft, 15 is a planting drive shaft, 16 is a first idle gear, 17 is a second idle gear, 18 is a shift gear, 16a, 17a, 18a
are clutch parts, and G ₁ , G ₂ , G ₃ , and G ₄ are fixed gears.

Claims (1)

[Claims for Utility _Model Registration] (1) Four or more fixed gears G _{1 ,} G _{2 .} . . A first idling gear and a second idling gear each having a clutch portion and constantly meshing with the fixed gears G ₁ and G _o located at both ends of _o are provided on the planting drive shaft so as to be rotatable only. Between the first idling gear and the second idling gear, there is a clutch part that selectively engages with the clutch parts of both these idling gears, and which selectively engages with the intermediate fixed gear _G2 ...G _o-1. A transmission device for adjusting the distance between planted plants, characterized in that a shift gear configured as above is arranged so as to be slidable only in the axial direction. (2) The transmission device for adjusting the distance between planted plants according to claim 1 of the utility model registration, characterized in that four fixed gears G ₁ , G ₂ . . . G _o are arranged in parallel.