JPH0122732Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a transmission device for a tractor.

Some tractors have a gear shift operation lever disposed on one side of the vehicle body and a shift lever shaft protruding from the other side of the vehicle body. A device for interlockingly connecting such a speed change operating lever and a shift lever shaft is disclosed in Japanese Utility Model Application Publication No. 118026/1983.

In this system, a plurality of long left and right rotating bodies are arranged front and back in parallel on the tractor body, with both ends of each rotating body protruding left and right from the vehicle body, and one of the protruding ends is interlocked with a speed change operation lever by a link. The other end and the shift lever shaft are interlocked and connected by a link.

In the conventional device described above, the long left and right rotating bodies are arranged front and back in parallel with the vehicle body, and both left and right ends protrude from the vehicle body, which is not only undesirable as it increases the size of the device and limits the installation space. Since the body is elongated from side to side, the amount of twist around the rotation axis is large, resulting in the problem that the shift lever shaft does not move accurately following the operation of the speed change operating lever.

The present invention aims to solve the above-mentioned technical problem, and its feature is that a plurality of shift operation levers 12 and 13 are swingably attached to one side of the vehicle body 17, and A plurality of shift lever shafts 18, 19 are protruded outward from the sides, and a plurality of relay levers 33, 35 are vertically parallel and swingably attached to the vehicle body 17 about a shaft 32 along the steering handle rotation axis. One end of each relay lever 33, 35 projects outward from the other left and right sides of the vehicle body 17, and each of these projecting ends and the shift lever shafts 18, 19 connect to link rods 36, 37 along the other left and right sides of the vehicle body 17. are interlocked and connected by
The speed change operation levers 12 and 13 and the relay levers 33 and 35 are connected to the Bowden wire 4.
1, 44, 43, and 46.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

The one shown in Figure 1 is the front. 1 is a plan view of a dual-purpose tractor, in which 1 is a bonnet covering an engine, 2 is a floor seat and steps, 3 is a pair of left and right rear wheel fenders, and 4 is a rear wheel.

Reference numeral 5 denotes a steering handle device, and numeral 6 denotes a driver's seat, each of which is replaceable fore and aft.The arrangement shown by the phantom line in FIG. 1 is the forward-facing driving arrangement, and the solid line is the rearward-facing driving arrangement.

7 is a brake pedal for forward driving, 8 is a clutch pedal, 9 is a brake pedal for rearward driving, and 10 is a clutch pedal. These are also before. It can be later replaced.

A panel body 11 is provided on one side in the left-right direction of the vehicle body, and shift operation levers such as a main shift lever 12, an auxiliary shift lever 13, and a shuttle lever 14 are provided on the body 11.

FIG. 2 is a side view of the above-mentioned forward-reverse tractor, in which a clutch housing 15 is attached to the rear end of the engine.
A tractor body 17 is constructed by rigidly coupling the transmission case 16 and the like. The transmission case 16 includes a main transmission, a shuttle transmission for forward/forward switching, a sub-transmission, a creep transmission, etc. (not shown). The shuttle transmission consists of a hydraulic clutch, and is controlled by the switching operation of the hydraulic shuttle valve, which will be explained next. Reverse movement can be switched.

A shift lever shaft 18 for first and second speeds and a shift lever shaft 19 for third and fourth speeds of the main transmission project from the side surface of the transmission case 16 opposite to the panel body 11. Each shift lever shaft 1
Arms 20 and 21 are attached to arms 8 and 19.
Further, a steering relay gearbox 22 is attached to the side surface of the transmission case 16 on the same side.

A front handle post mounting portion 23 for forward-facing driving is provided on the upper surface of the clutch housing 15. The mounting section 23 includes a hydraulic shuttle valve 24 mounted and fixed on the upper surface of the clutch housing 15, a transmission stand 25 fixed on the upper surface of the valve 24, and a handle post attachment/detachment section attached on the transmission stand 25. It consists of 26.

A handle post 27 is detachably attached to the detachable portion 26. The operating force of the handle 28 is transmitted to the universal joint shaft 30 via the gear 29 in the detachable part 26, and from the joint shaft 30 to the relay gear box 22.
It is transmitted to the transmission shaft 31 of. The front end of the transmission shaft 31 is connected to a steering device for a steering wheel, and the rear end is connected to a rear handle post attachment portion for rearward facing.

As shown in FIGS. 3 and 4, a pivot shaft 32 along the steering handle rotation axis is provided on one side of the gearbox 25 on the shift lever shafts 18 and 19 side.
Three L-shaped relay levers 33, 34, and 35 are pivotally supported along the vertical direction. One end of the upper and lower relay levers 33, 35 and the arms 20, 21 of the shift lever shaft are interlocked and connected by connecting rods 36, 37. One end of the central relay lever 34 is connected to an operating shaft 39 of the hydraulic shuttle valve 24 via a connecting rod 38.

A Bowden wire outer receiving portion 40 is protruded from one side of the transmission platform 25 on the panel body 11 side.
42 and 43 are connected. The inner wires 44, 45, 46 of the Bowden wire are connected to the relay lever 3.
3, 34, and 35. The other end of the central inner 45 is connected to the shuttle lever 14,
The inners 44 and 46 at both the upper and lower ends are respectively connected to the main speed change lever 12 via shift levers.

According to the embodiment of the present invention, the main shift lever 12 and the shuttle lever 1 are provided on one side of the vehicle body 17.
Shift lever shafts 18 and 19 provided on the opposite side from 4
And relay levers 33, 3 are connected to the transmission platform 25 to transmit the operating force to the hydraulic shuttle valve operating shaft 39.
4, 35, one of which is connected via the levers 33, 34, 35 to Bowden wires 44, 45, 4.
6. Since the other wire is interlocked with the rods 36, 38, and 37, the length of the Bowden wire can be shortened, and operability can be improved. Furthermore, since the gear shift operating device is provided using the attachment/detachment portion 26 of the handle post, the number of parts can be reduced. The attachment/detachment section 26 equipped with such a transmission stand 25 can also be adopted in a forward-facing vehicle, and a forward-facing vehicle and a forward-facing vehicle.
Before. Parts can be shared with reverse-moving dual-purpose vehicles.

Note that the present invention is not limited to the above embodiments.

According to the present invention, since the plurality of relay levers are swingable about the axis along the steering handle rotation axis, the relay levers can be arranged by effectively utilizing the space on the side of the handle post. In addition, one end of the relay lever protrudes to the other side of the car body, and the link rod that interlocks and connects this protruding part with the shift lever shaft makes use of the space on the side of the car body by running along the other side of the car body. Available.

Furthermore, by interlocking and connecting the gear shift operation lever and the relay lever with Bowden wire, the relay lever does not need to protrude from one side of the vehicle body, making the device more compact. Since there is no problem such as twisting of the shift lever, the shift lever shaft can be moved reliably following the operation of the gear shift control lever.

[Brief explanation of drawings]

The figures show an embodiment of the present invention, and FIG. 1 is a plan view;
2 is a side view, FIG. 3 is a view taken along the - arrow in FIG. 2, and FIG. 4 is a sectional view taken along the line - in FIG. 12...Main gear shift lever, 14...Shuttle lever, 18, 19...Shift lever shaft, 23...Handle post attachment part, 24...Hydraulic shuttle valve, 25...Transmission table, 26...Detachable part, 27 ……
Handle post, 33, 34, 35... Relay lever, 36, 37, 38... Connection rod, 39...
Operation axis, 41-46...Porden wire.

Claims (1)

[Scope of utility model registration request] A plurality of shift operation levers 1 are provided on one left and right side of the vehicle body 17.
2 and 13 are attached so as to be swingable, and the vehicle body 17
A plurality of shift lever shafts 18 and 19 are projected outward from the other side, and a plurality of relay levers 33 and 33 are attached to the vehicle body 17.
35 are vertically parallel and swingably attached to the center of the shaft 32 along the steering handle rotation axis, and one end of each relay lever 33, 35 projects outward from the other left and right sides of the vehicle body 17, and this projection Each of the ends and each of the shift lever shafts 18 and 19 are connected to the vehicle body 1.
The gear shift operating levers 12, 13 are interlocked and connected by link rods 36, 37 along the other left and right sides of the gear shift levers 12, 13.
A tractor transmission device characterized in that each relay lever 33, 35 is interlocked and connected by Bowden wires 41, 44, 43, 46.