JPH085414Y2 - Remote transmission for work vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a remote transmission for a work vehicle such as a tractor and a combine.

[Problems to be Solved by Prior Art and Invention] Today, in this type of work vehicle, a remote operation for separating the worker from the traveling machine body has been proposed as one means for ensuring work safety, and In order to enable remote control of the traveling machine body, each operating part such as the steering device braking device of the traveling machine body is provided with an operating device (actuator) for activating each operating part based on the operation signal from the transmitter. There is a need.

However, the transmission requires not only a large number of operating positions (forward, reverse, neutral, etc.) but also an intermediate stop operation such as the neutral position. However, the transmission is internally installed in the transmission as in the past. In such a case, the transmission may be particularly large and complicated, or the transmission may need to be modified, which is very costly and a problem.

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and was devised with the object of providing a remote transmission for a work vehicle capable of eliminating these drawbacks. At this point, a gear shift shaft that protrudes from the transmission and rotates so as to operate the shifter inside the transmission to perform a gear shift operation is provided, and a protruding tip portion of the gear shift shaft is provided.
The operating rod that rotates together with the gear shift shaft and the operating rod that is disposed so as to sandwich the operating gear, and the telescopic operation based on remote operation interferes with the operating rod to shift the gear shift shaft to the corresponding gear position including the neutral position. Pair of single-acting hydraulic cylinders that can be used, detection means that detects that the shift shaft shifts to the neutral position, and stop control means that stops the expansion and contraction operation of the hydraulic cylinder based on the detection of the neutral position of the detection means. And is provided.

The present invention, by virtue of this structure, is capable of performing remote gear shifting without modifying the inside of the transmission, and is compact and inexpensive.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings.
In the drawings, reference numeral 1 denotes a traveling machine body of a tractor, the traveling machine body 1 being drive wheels (front wheels 2 and rear wheels 3 in the embodiment).
However, the vehicle travels by being driven by the engine power transmitted through the transmission 4, and the traveling direction is changed by the steering operation of the steered wheels (front wheels 2) by operating the steering wheel 5. All of these configurations are conventional.

Reference numeral 6 denotes a gear shift lever provided on the side of the driver's seat 7, and the gear shift lever 6 is swingably supported in the front-rear direction and the left-right direction with respect to the support shaft 8 so as to be operable along a gear shift guide. However, the boss mechanism 9 interposed between the base end of the speed change lever 6 and the support shaft 8 moves the first speed change rod 10 which will be described later up and down when the speed change lever 6 is operated to the first forward speed or the reverse position. The second shift rod 11 is configured to move up and down when the shift lever 6 is moved to the forward second speed or the forward third speed position. Meanwhile, 1
Reference numerals 2 and 13 denote speed change shafts whose tips project from the transmission 4. The speed change shafts 12 and 13 are connected at their base ends to shifters (not shown) in the transmission 4 and rotate by a predetermined angle. The shifter operates the shifter by shifting the shifter.The base end side of the shift arms 14 and 15 whose tip ends are connected to the lower end portions of the first and second shift rods 10 and 11, respectively, is integrally formed with the projecting tip end portion. And a gear shift operation mechanism capable of gear shift operation by the gear shift lever 6 is configured by these.

On the other hand, 16 and 17 are single-acting hydraulic cylinders, and the pair of hydraulic cylinders 16 and 17 are attached to a bracket 18 provided below the gearshift shaft 12 in a posture in which they face each other. The front end portion of the operating rod 19 which is provided so as to project from the shift shaft shaft 12 in the radial direction is interposed between the two opposed positions. That is, when the hydraulic cylinders 16 and 17 are extended to press the operating rod 19 to rotate the gearshift shaft 12, the gearshift mechanism can be gearshifted instead of the manual gearshift operation of the gearshift lever 6. It is becoming like this. The mounting positions of both hydraulic cylinders are set so that they do not interfere with the operating rod 19 in the contracted state.

Further, 20 and 21 are detection switches for detecting the shift position, and these detection switches 20, 21 and 22 are arranged in parallel with a bracket 23 provided on the side of the shift shaft 12 to detect the detection switches. The portions 20a, 21a, 22a are engaged with the tip end of a detection rod 24 that projects from the gear shift shaft 12 in the radial direction so that the portions 20a, 21a, and 22a are retracted so that the detection operation is performed.

In the embodiment of the present invention constructed as described above, shifting to the first speed position and shifting to the reverse position by remote control are
Made by extending the hydraulic cylinders 16 and 17,
To switch to the neutral state, the detection switches 20, 22
By detecting the hydraulic cylinder that can press the operating rod 19 toward the intermediate position side based on the detection of, the extension operation is performed, and when the detection switch 21 detects the operation, the operating hydraulic cylinder is stopped and controlled. Will be done.

As described above, in the embodiment of the present invention, the speed change mechanism is operated by the operation based on the operation command signal from the remote control transmitter (not shown). The operation mechanism is simply configured by providing a pair of single-acting hydraulic cylinders 16, 17 and detection switches 20, 21, 22. Therefore, it is possible to eliminate the need for major modifications such as structural changes to the transmission, and it is possible to simplify the structure and make it compact, resulting in a significant cost reduction of the gearbox actuating device. It can be measured. Moreover, since a single-acting hydraulic cylinder is used, there is an advantage that the hydraulic justice mechanism for controlling the operation of the hydraulic cylinder can be simplified.

[Advantages] In short, since the present invention is configured as described above, when gear shifting is performed by remote control, the gear shift shaft shifts to the corresponding gear shift position by the telescopic operation of the hydraulic cylinder based on the remote control. When the shift position detecting means detects the shifted position of the shifted shift shaft, the expansion / contraction operation of the hydraulic cylinder is stopped, whereby the necessary shift control by remote operation can be performed.

Moreover, in the configuration of performing the gear shift by the remote operation, the operating rod externally provided to the gear shift shaft outside the transmission, the pair of single-acting hydraulic cylinders provided so as to sandwich the operating rod, and the gear shift By providing a detection means for shifting the shaft to the neutral position and a stop control means for stopping the expansion / contraction operation of the hydraulic cylinder based on the detection of the neutral position, it suffices to provide a manual shift operation tool. This can be easily done by adding retrofitting that each of the above-mentioned members is provided outside the transmission, without making a major modification in the transmission mechanism. As a result, it is possible to eliminate the need for a major modification such as a change in the transmission structure, or it is possible to easily change the speed of the existing one remotely.

[Brief description of drawings]

FIG. 1 shows an embodiment of a remote type transmission for a work vehicle according to the present invention. FIG. 1 is an overall side view of a tractor, and FIG. 2 is a plan view showing a transmission operating mechanism.
FIG. 3 is a side view of the main part of the same as above, and FIG. 4 is an enlarged side view of the same as above. In the figure, 1 is a traveling machine body, 4 is a transmission, 6 is a shift lever, 16 and 17 are hydraulic cylinders, and 20, 21 and 22 are detection switches.

Claims (1)

[Scope of utility model registration request] Claims: 1. A shift shaft that projects from a transmission and rotates to shift a shifter installed in the transmission so that the shifter operates, and an operating rod that is provided at a protruding tip of the shift shaft and that rotates together with the shift shaft. , A pair of single-acting hydraulic cylinders that are arranged opposite to each other with the operating rod interposed therebetween and that can be shifted to a corresponding shift position including a neutral position by interfering with the operating rod by telescopic operation based on remote operation. And a detection means for detecting that the shift shaft shifts to the neutral position, and a stop control means for stopping the expansion and contraction operation of the hydraulic cylinder based on the detection of the neutral position by the detection means. Remote transmission for work vehicles.