JPS62180146A - Driving system power transmission device of wheel type tractor - Google Patents

Abstract

PURPOSE:To secure a great speed reduction ratio without increasing a wheelbase in a power transmission device with a driving train transmission mechanism interposed by connecting one shaft end side of two counter shafts to an engine and connecting either one side of the other shaft to a differential mechanism. CONSTITUTION:A main idle gear shaft 21 having a group of three transmission gears 22, 23 and 24 is arranged via a shifter clutch 27 to the rear of an intermediate input shaft 26. A 1st counter shaft 28 and a 2nd counter shaft 29 are arranged on both sides of and parallel with the shafts 21 and 26. The shafts 28 and 29 are of cylindrical construction with the shaft 28 provided with a gear 30 as well as a group of speed change gears 31, 32 and 33 capable of idle running and to be engaged with a group of gears 22, 23 and 24 on the shaft 21. On the shaft 29 are arranged a group of gears 37 through 40, with the gear 37 engaging with the gear 25, with gears 38 through 40 engaging respectively with gears 22 through 24 arranged on the shaft 21, and both of the two pairs of gears facing each other in the shaft direction are provided with shifter clutches 41 and 42. Rotary power of an engine 4 is transmitted via a transmission mechanism capable of obtaining from 1st to 14th speeds to a differential mechanism 43.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a traveling system power transmission device for a wheeled tractor.

(Prior Art) A traveling system power transmission device for a wheeled tractor that transmits the rotational power of an engine to a differential mechanism via a traveling system primary transmission mechanism and a traveling system secondary transmission mechanism is disclosed in Japanese Utility Model Publication No. 59-27568. It is known from Publication No. 59-30747.

(Problems to be Solved by the Invention) In any of the conventional examples described above, the primary transmission mechanism (main transmission mechanism) and the secondary transmission mechanism (auxiliary transmission mechanism) are spaced apart in the longitudinal direction within the transmission case that constitutes the vehicle body. However, the front and rear lengths are too long, making it difficult to install a hydraulic pack, which has recently become necessary.

Furthermore, the distance between the front and rear wheel stops, that is, the wheelbase is too long, and the steering turning radius is also large.

In particular, unlike automobiles, tractors require a large reduction ratio, and it is difficult to arrange many gears in a narrow space.

The object of the present invention is to make it possible to install a hydraulic blowout or other equipment either at the front or rear of the transmission case without increasing the wheelbase (and ensuring a large reduction ratio).

(Means for Solving the Problems) The technical means taken by the present invention to achieve the above-mentioned object is characterized in that the rotational power of the engine is transferred through the primary transmission mechanism of the traveling system and the secondary transmission mechanism of the traveling system. In a device that transmits power to a differential mechanism, a first counter shaft and a second counter shaft are installed on both sides of a main idle gear shaft having a group of transmission gears with an axial interval, parallel to the gear shaft in the axial direction. has been
A transmission gear group interlocked with a transmission gear group of the main idle gear shaft is provided on each of the counter shafts, and one shaft end side of each of the first and second counter shafts is interlocked with the engine side. This is because the other end of either the first or second counter shaft is operatively connected to the differential mechanism.

(Example) Embodiments of the present invention will be described in detail below with reference to the drawings.

In Figures 5 and 6, 1 is a wheeled tractor;
It has a pair of left and right front wheels 2 and a pair of left and right rear wheels 3, and is equipped with an engine 4. A transmission case 6 is connected to the engine 4 via a clutch housing 5 to form a vehicle body. .

A transmission device that transmits the rotational power of the engine to the differential mechanism via the primary transmission mechanism of the traveling system and the secondary transmission mechanism of the traveling system is built in the mission case 6.

In FIG. 1, reference numeral 7 denotes a clutch, which engages and disengages the propulsion shaft 10, which has a gear 8.9, into and from the engine 4.

A PTO system propulsion shaft 12 is interlocked with the rear end of the propulsion shaft 10 via a coupling 11, and a PTO hydraulic clutch 13 is provided on the PTO system propulsion shaft 12, which is interlocked with a PTO transmission shaft 14. ing.

15 is a forward/backward switching mechanism (shuttle mission);
It has a reverse rotation gear 17 that is interlocked with the gear 8 on the propulsion shaft 10 via an intermediate gear 16, and a forward rotation gear 18 that is directly interlocked with the gear 9 on the propulsion shaft 10, and a hydraulic clutch section 19.
and is provided on the input shaft 20.

21 is a main idle gear shaft, and in this example, it has three transmission gear groups 22, 23, and 24 spaced apart in the axial direction, and a shifter clutch 27 is installed at the rear of a relay input shaft 26 having a gear 25. It is provided through.

That is, the input shaft 20, the relay input shaft 26, and the main idle gear shaft 21 are arranged on the same axis.

28 is a first counter axis, 29 is a second counter axis,
They are installed parallel to each other on both sides of the main idle gear shaft 21.

First and second counter shafts 28 and 29 are installed above and below the main idle gear shaft 21 in FIG. 2, and on the left and right sides of the main idle gear shaft 21 in FIG. For example, first and second counter shafts 28 and 29 are installed above and below.

The first and second counter shafts 28 and 29 both have a cylindrical shaft structure, and have a gear 3o on the first counter shaft 28 that meshes with the gear 25 on the relay input shaft 26. Transmission gear groups 31, 32, 33 meshed with the upper gear groups 22, 23, 24 are provided so as to be able to rotate freely, and among the transmission gear groups, one set 32, 32, 33 that faces each other in the axial direction
is provided with a shifter clutch 35, and the shifter gear 31 can be freely connected to and disconnected from the engagement gear 36.

On the second counter shaft 29 are transmission gear groups 37, 38, 39.
40 are provided, the gear 37 is interlocked with the gear 25, the other gear 3B, 39.40 is interlocked with the corresponding gear 22, 23, 24 on the main idle gear shaft 21, and two sets facing each other in the axial direction are provided. It has a shifter clutch 4L42.

Reference numeral 43 denotes a differential mechanism, which in this example is for the rear wheels, and is interlocked with a drive pinion shaft 44.

Reference numeral 45 denotes an output shaft, which has a cylindrical shaft structure, and in this example is connected to the rear end of the second counter shaft 29 via a coupling 46, and is connected to the drive pinion shaft 44 via a pair of gear groups 47. is linked to.

Reference numeral 48 denotes a ground PTO drive gear, in which a sliding gear 49 of the PTO transmission shaft 14 can be freely connected and disconnected, and a gear 51 on the front wheel drive system propulsion shaft so is engaged with it.

Note that a second counter shaft 29 and an output shaft 45 are provided on the propulsion shaft 50.
is covered.

Also, in this example, the first counter shaft 28 is the input and the second counter shaft 29 is the output, but it is sufficient that either one is the input and the other is the output, and in this example, the main idle gear The gear group on the shaft and the gear group on the first counter shaft constitute a primary transmission mechanism, and the gear group on the main idle gear shaft and the gear group on the second counter shaft constitute a secondary transmission mechanism. There is.

In the above configuration, the rotational power of the engine 4 is transferred to the clutch 7
When the gears are engaged and disengaged, the gear shift is transmitted to the differential mechanism 38 in the manner shown in the table below.

In the table below, the symbols ``■'' and ``■'' to ``■'' correspond to those in FIG.

That is, in this illustrated example, 1st to 14th speeds can be obtained.

(Effects of the Invention) According to the present invention, in a device that transmits rotational power of an engine to a differential mechanism via a traveling system primary transmission mechanism and a traveling system secondary transmission mechanism, the transmission gear group is arranged with an axial interval. A first counter shaft and a second counter shaft are respectively installed on both sides of a main idle gear shaft having the main idle gear shaft, parallel to the gear shaft in the axial direction,
A transmission gear group interlocked with a transmission gear group of the main idle gear shaft is provided on each of the counter shafts, and one shaft end side of each of the first and second counter shafts is interlocked with the engine side. This system is characterized in that the other end of either the first or second counter shaft is interlocked and connected to the differential mechanism, so it is possible to carry out multi-stage travel shifting in a compact structure in the longitudinal direction inside the transmission case. As a result, the wheelbase does not become long, and other auxiliary equipment (hydraulic pack, etc.) can be built into the transmission case.

Furthermore, since the input is made from one end in the axial direction of the first and second counter shafts, the balance of the input is improved.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIGS. 2 to 4 are longitudinal cross-sectional views showing three examples, FIG. 5 is a front view of the tractor, and FIG. 6 is a side view of the same. 4-Engine, 21--Main idle gear shaft, 22.2
3゜24-Gear on 21, 26-Human power shaft, 28-1st counter shaft, 30-33-Gear on 28, 29-2nd counter shaft, 37-40/-Gear on 29, 43-Differential mechanism.

Claims (1)

[Claims] (1) In a device that transmits the rotational power of the engine to the differential mechanism via the traveling system primary transmission mechanism and the traveling system secondary transmission mechanism, the main idle gear shaft having the transmission gear group with an axial interval on both sides , a first counter shaft and a second counter shaft are each installed axially parallel to the gear shaft,
A transmission gear group interlocked with a transmission gear group of the main idle gear shaft is provided on each of the counter shafts, and one shaft end side of each of the first and second counter shafts is interlocked with the engine side. 1. A traveling system power transmission device for a wheeled tractor, characterized in that the other end of one of the first and second counter shafts is interlocked and connected to a differential mechanism.