JPS6037481Y2 - transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transmission, and more particularly, to a transmission suitable for, for example, a transmission that facilitates changing the planting density of a riding rice transplanter.

In conventionally known riding rice transplanters, the output of the engine mounted on the vehicle body is transmitted to the rear wheels or only the rear wheels via a transmission, and a part of the engine output is further transmitted to the planting machine. It is configured so that it can perform rice planting work while traveling in the field.

In such a rice transplanter, a transmission is built into the transmission system to select the traveling speed of the index vehicle and to select dense or coarse planting by the planting machine.
There is a need for a device that has a simple configuration and can perform multiple speed changes.

Therefore, this invention has made it possible to easily and easily select, for example, the speed of the vehicle, the speed of the planting machine, and in particular the density of planting seedlings, in a riding-type rice transplanter. The aim is to provide a transmission.

Details of this invention will be described below with reference to an illustrated embodiment applied to a riding rice transplanter.

First, in FIG. 1, reference numeral 1 indicates an engine mounted on the vehicle body, and its output is transmitted to an input shaft 4 to a transmission 10 by a belt 3 suspended between a pair of pulleys 2.2. A rear wheel drive shaft 5, a front wheel drive shaft 6, and a transmission shaft 7 to a planting machine are led out from the transmission 10.

The rear wheel drive shaft 5 constitutes a transmission system that transmits power to a rear wheel shaft 52 via a differential mechanism 51 and further drives a rear wheel 53.

Further, the front wheel drive shaft 6 also connects to the transmission shaft 62 via the differential mechanism 61.
The front wheel axle 65 is driven via gear groups 63 and 64 to match the circumferential speeds of the front wheels 66 and the rear wheels 53, and the front wheels 66 are also driven by a power transmission. It constitutes a system.

The transmission shaft 7 to the planting machine constitutes a transmission system that moves the planting machine via an intermediate joint 71, a universal joint 72, and the like.

The transmission 10 that transmits the output of the engine to such a power transmission system has the following configuration.

That is, the input shaft 4 and the rear wheel drive shaft 5 are in a parallel relationship, and a shift gear 12 that is integrated with a reverse gear 11 is spline-fitted to the input shaft 4. A high-speed shift gear 13 consisting of two gears with different numbers of teeth is arranged by spline fitting, and the gear 13a with a smaller number of teeth is used as the second gear of the vehicle speed selection.
The gear 13b, which is in charge of speed and has a large number of teeth, is in charge of third speed.

Furthermore, a first speed gear 14, a second speed gear 15, and a third speed gear 16 are fixed to the rear wheel drive shaft 5, and the third speed gear 16 meshes with an input gear 67 of the front wheel drive shaft 6. ing.

Reference numeral 17 indicates a reverse gear that meshes with the reverse gear 11 via an idler.

Furthermore, power is transmitted to the driven shaft 7 as a transmission shaft to the planting machine via a gear group of a drive shaft 8 of the planting machine arranged parallel to the input shaft 4.

That is, the drive shaft 8 has a first stage gear 81 for changing the operating speed of the planting machine in the same plane as the first speed gear 14, and furthermore, in series with this first stage gear 81, there is a first stage gear 81 for changing the operating speed of the planting machine. A second stage gear 82 having fewer teeth is fixed.

The first stage gear 81 has a tooth width larger than that of the first speed gear, preferably about twice the tooth width, so that the shift gear 12 first meshes with the first stage gear and only the drive shaft 8 is engaged. However, by maintaining the transmission relationship and further feeding the shift gear 12 as it is, it meshes with the first speed gear 14 and the first stage gear 81 at the same time.

The second stage gear 82 can mesh with the gear 13a of the high speed shift gear 13 of the input shaft 4.

Further, two speed change gears 83.84 having the same diameter and different numbers of teeth are fixed to the drive shaft 8, and these speed change gears 83.84
Two integrated switching gears 73 with a planting density spline-fitted to the driven shaft 7 are located between them, and a first stage gear 73a1 with the same diameter and a small number of teeth has the same diameter and a small number of teeth. It is composed of a large number of second stage gears 73b.

Therefore, the switching gear 73 for the transmission gear 83,84
The planting density can be selected from dense to coarse by combining the gearings a and 73b.

That is, two gears 83 and 84 with the same diameter and different numbers of teeth are provided on the drive shaft 8, and a switching gear 73a with the same diameter and different numbers of teeth is spline-fitted to the driven shaft. 73
The switching gear 73 constituted by b constitutes a transmission 100 for selecting the planting density of seedlings.

For example, the number of teeth of the transmission gear 83 and 84 is r1 ridge J.
If the number of teeth of the switching gears 73a and 73b is set as 11 teeth and 7 teeth, the number of plants planted per 3.377L will be 60 plants, 7 teeth, You can choose from three options: 8@.

That is, as shown in FIG. 3A, the transmission gear 83 and the switching gear 73
When b is in mesh, it is 60 stocks/3.3d, and when the transmission gear 84 and switching gear 73b are in mesh as in the same mouth, it is 701.
! /3.3d, and further meshing of the transmission gear 84 and the switching gear 73a results in a planting density of 8 (M/3.3d).

Next, the actual speed change of the power transmission system for the wheels will be explained.

First, shift the shift gear 12 on the input shaft 4 to the first gear 14.
When engaged, the maximum torque is achieved, and the high-speed shift gear 13 is shifted to the second gear 15 or the third gear 16.
By engaging the wheels, the wheel drive system rotates at high speed.

This third speed gearing is used when driving on the road, and is not used during planting work in the field.

In particular, in the process of meshing the shift gear 12 with the first speed gear 14, the shift gear 12 meshes with the first speed gear 81 and then meshes with the first speed gear, and when meshing with the first speed gear, the first speed gear Since it is configured to mesh with the gear 81, the planting machine can be driven before the riding rice transplanter starts traveling.

Therefore, it is effective for inspecting each part while driving the planting machine, and does not require clutch operation.

In addition, when selecting the planting density of seedlings in the field,
Transmission gears 83, 84 and switching gear 73a.

The planting density is changed by changing the combination of 73b.

The greater the number of gears that make up the transmission 100, the more the density can be changed in multiple stages.
A group of four gears is sufficient.

The present invention is applicable not only to the riding-type rice transplanter of the above embodiment, but also to a wide variety of traveling work machines, etc., in which the number of gears of the working part (driven shaft) is changed to multiple stages, independent of the traveling speed of the traveling part. It is.

As is clear from the above description, according to the transmission device of this invention, a plurality of transmission gears having the same diameter and different numbers of teeth are provided on one of the drive shaft and the driven shaft, and A plurality of switching gears having the same diameter and different numbers of teeth are provided so as to be integrally movable on the shaft, and the switching gears are selectively engaged with the transmission gear to increase the number of gears of the driven shaft. Therefore, it is possible to easily perform multi-speed shifting with a simple configuration with a reduced number of gears, and the shifting operation is simple and easy, and has a wide range of uses.

[Brief explanation of the drawing] The figure shows the case where this invention is applied to a riding type rice transplanter.
FIG. 1 is an explanatory diagram of a gear train showing a transmission drive system, FIG. 2 is a sectional view of the transmission, and FIG. 3 is an explanatory diagram showing a gear engagement state when selecting planting density in a planting machine. In the figure, symbol 7 is a driven shaft, 8 is a drive shaft, and 73a. 73b is a switching gear, and 83.84 is a transmission gear.

Claims (1)

[Scope of utility model registration request] Multiple transmission gears with the same diameter and different numbers of teeth are installed on one of the drive and driven shafts, and multiple switching gears with the same diameter and different numbers of teeth are integrated on the other shaft. 1. A transmission device, characterized in that the transmission gear is provided movably on a shaft, and the switching gear is provided so as to be able to engage with the transmission gear.