JPS5821779Y2 - Continuously variable speed mobile vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a continuously variable transmission vehicle, such as a combine harvester, having a speed change lever for operating a hydraulic continuously variable transmission.

In conventional continuously variable transmission vehicles, it is difficult to return the gear shift lever smoothly from the forward operation area or reverse operation area to the neutral gear position, and when the vehicle body suddenly stops due to going too far from the neutral gear position. There is a risk that the engine will stop, and even if the engine does not stop,
This had the disadvantage that a dangerous situation could occur in which the vehicle unexpectedly started running as soon as the brake was released.

The present invention attempts to eliminate the drawbacks of the above-mentioned prior art, and by providing a foot-operated operating tool separate from the gear shift lever, it is possible to easily return the gear shift lever to neutral. The object of the present invention is to provide a continuously variable transmission vehicle that can avoid unexpected engine stops by associating the return of a gear shift lever to neutral and the operation of a safety device.

The characteristic configuration of the continuously variable transmission mobile vehicle according to the present invention is that a foot-operated operating tool is provided for forcibly returning the gear shift lever for operating the hydraulic continuously variable transmission to the neutral gear position, and A switch is provided for detecting that the lever has been returned to the neutral gear position by the foot-operated operating tool, and this switch is interposed in the electric circuit from the main switch to the engine starter switch. The present invention consists of a safety device that enables the engine to be started only when the engine is in the neutral position, and this configuration provides the following effects.

In other words, in order to ensure safety when operating a continuously variable transmission mobile vehicle, it is necessary to (1) be able to reliably return the gear shift lever from the forward or reverse operation range to the neutral gear position, and (2) to be able to do this operation quickly. The gear shift lever must be able to return to the neutral position even if the driver is manually steering the vehicle. Even if a situation occurs in which the engine does not return to the neutral position, it is required that the engine does not move forward or backward unexpectedly when starting, and even if one of these is missing, it is insufficient for safety, but in the present invention. Complete safety was ensured as described below.

(b) By providing a dedicated foot-operated operating device for forcibly returning the gear shift lever to the gear shift neutral position, the gear shift lever can be reliably moved from the forward operation area or the reverse operation area to the gear shift neutral position.
Continuously variable transmission that can be returned quickly and prevents the engine from stopping when the vehicle suddenly stops, and also avoids the risk of the vehicle starting to run as soon as the brake is released, which would occur if the engine does not stop, allowing safe driving. We are now offering a type of mobile vehicle.

←）Furthermore, when operating a variable-speed mobile vehicle, the operator's hands normally perform the steering operation, but the operating tool for returning the gear shift lever to the neutral position is a foot-operated device. In addition, the shift lever can be easily returned to the neutral position with the foot while performing the steering operation by hand, and the shift lever can be returned to the neutral position more quickly and easily.

(c) If the operator forgets to press the foot-operated control device or does not press it enough, the operator may become fatigued.
Due to erroneous operation, carelessness, lack of familiarity, etc. that tend to occur during driver changes or emergency operator operations, even if the gear lever has not returned to the neutral gear position accurately and the engine has stopped, Since the engine is equipped with a safety device that allows the engine to start only when the gear shift lever is in the neutral gear position, the engine will not start unless the gear shift lever is accurately returned to the neutral gear position, and therefore the engine will not start. Unexpected forward or reverse movement at start-up is avoided.

B) Due to the effects of (a), ←) and ← above, safety is ensured no matter what situation occurs, so it is extremely reliable in terms of safety.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a combine harvester, including a threshing device 5 and an engine 6.
At the front of the fuselage frame 9, which is equipped with a mission case 8 that transmits power to a pair of left and right crawler-type traveling devices 7. α? 7) A reaping section 13 consisting of a vertical conveying device 12, etc., which gradually changes the posture of grain culms that have been harvested in an upright position to a sideways posture, and transports and supplies them to the threshing device 5 side, is provided, and in front of the threshing device 5. Section vertical transport loading 2
A control section 14 configured on the side of the engine 6 has a control section 14 that is configured to control the engine 6 by swinging movement along a fixed linear path in the longitudinal direction of the aircraft.
A gear shift lever 2 is provided between the transmission case 8 and the transmission case 8 for switching the hydraulic continuously variable transmission 1 between forward and backward movement and for performing continuously variable speed operation.

The speed change lever 2 is connected to the control section 14 as shown in FIG.
The shift neutral position NK is forcibly returned from the forward operation region F or the reverse operation region R in conjunction with the depression of the foot-operated operating tool 3 provided at the front.

That is, a support shaft 1 that swingably supports the foot-operated operating tool 3.
5 and in a vertical plane through which the axis of the support shaft 15 passes, the rotation shaft 16 is pressed by a pressing arm 17 provided on the boss portion 3A of the operating tool 3.
A cam 19 that rotates around the gear shifter against the elastic biasing force of a spring 18, and an arm 21 having a pair of links 20, 20 pivotally connected to both ends of the cam 19 are attached, and the shift lever 2 The one engaging portion 22 provided in the link 20 and the free end portions of both the links 20, 20 are securely connected via the pin 22A and the elongated hole 20A920A with a certain range of speed change operation flexibility. The shift lever 2 is forcibly swung at one end of the elongated hole 20At20A of both links 20, 20 by the displacement of both links 20, 20 accompanying the depressing operation of the tool 3, and the shift lever 2 is forcibly swung at one end of the elongated hole 20At20A of both links 20, 20. (See the opening in Figure 3) or from the reverse operation area R (See the opening in Figure 3), return the shift from the neutral gear position N (See the opening in Figure 3) to the neutral gear position N (See the opening in Figure 3), The elongated holes 20A and 20A end portions of both links 20 and 20 are configured to hold the gear shift in the forward position.

In the figure, reference numeral 23.23 indicates a link length adjuster interposed in the middle of both the links 20, 20.

And main switch SW and starter switch fSW
In the electric circuit A of the engine 6, which is interposed with,
A switch sw is provided which detects and operates when the shift lever 2 is returned to the forward operating position N by the stepping operation of the foot-operated operating tool 3, so that the shift lever 2 is in a neutral shift position. A safety device 4 is configured that allows the engine to be started only when the vehicle is in use.

[Brief explanation of drawings]

The drawings show an embodiment of the continuously variable speed mobile vehicle according to the present invention,
Fig. 1 is an overall side view of the combine harvester, Fig. 2 is an enlarged side view of the main parts, Fig. 3 is a diagram of the action of the treadle-type operating tool when it is depressed, and Fig. 4 is an electrical circuit diagram of the main parts. It is. 1...Hydraulic continuously variable transmission, 2...Shift lever, 3...Foot operated operating device, 4...
·Safety device.

Claims (1)

[Claims for Utility Model Registration] Gear shift lever 2 for operating hydraulic continuously variable transmission 1
a foot-operated operating tool 3 for forcibly returning the shift lever 2 to the neutral shift position, and a switch SW for detecting that the shift lever 2 has been returned to the neutral shift position by the foot-operated operating tool 3, and , this switch SW is interposed in the electric circuit A extending from the main switch SW1 to the engine starter switch SW to constitute a safety device 4 that enables engine starting only when the shift lever 2 is in the shift neutral position. A continuously variable speed mobile vehicle characterized by: