JPH0438228A - Travel control for traveling vehicle - Google Patents

Abstract

PURPOSE:To make forward-backward transfer and car speed variation achievable simultaneously with a control handle and a farm working machine operating lever or the like by installing a means transmitting each alternative treading operation of both forward and backward pedals to a selector control valve, and another means turning round an accelerator lever in the speed-increasing direction by each of these treading operations of the forward-backward pedals, respectively. CONSTITUTION:Traveling vehicle is provided with a selector control valve 15 operating alternatively forward-backward select clutches 12F, 12R, and an accelerator lever 16 increasing or decreasing a travel speed. In the above mechanism, there is provided a forward-backward operating force transmitting means 40 which transmits each alternative treading operation of a pair of forward-backward operating force transmitting means 40. Also there is provided an accelerator operating force transmitting means 48 turning round the accelerator lever 16 in the speed-increasing direction by the treading operation after the selector control valve 15 is transferred. When one side of these forward-backward pedals is operated, the forward- backward operating force transmitting means 40 is operated, transferring the selector control valve 15, and one side of the forward-backward selector clutches 12F, 12R is operated. When the forward-backward pedals are operated, the accelerator operating force transmitting means 48 is operated as well, thereby rotating the accelerator lever 16.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a travel control device for a traveling vehicle such as a tractor, which is equipped with a working machine such as a front loader and is frequently switched between forward and backward movement.

(Prior art) For example, in a tractor equipped with a front loader,
In order to frequently repeat forward and backward movement during ground work, some devices are equipped with a forward/reverse switching device that is operated by a hydraulic clutch, and the forward/reverse switching clutch used for this is installed near the control handle. The control lever is configured to operate the switching control valve.

(Problem to be Solved by the Invention) However, during ground work, it may be necessary to operate the control handle, raise the front loader boom, and raise the hackent at the same time, and all operations must be performed manually. Therefore, it is extremely difficult and complicated to perform these operations and forward/reverse switching operations at the same time.

SUMMARY OF THE INVENTION An object of the present invention is to provide a running operation device for a running vehicle that can solve the problems of the prior art by allowing forward and backward switching operations to be performed with the foot that depresses the accelerator pedal.

(Means for Solving the Problems) A specific configuration for solving the problems in the present invention includes a switching control valve 15 that selectively operates the forward/reverse switching clutches 12F and 12R, and an accelerator pedal that increases/decreases the traveling speed. 16
In a traveling vehicle having a pair of forward/reverse pedals 12
F, 12R, a forward/reverse operation force transmission means 40 that transmits the alternative depression operation of the forward/reverse pedals 12F, 12R to the switching control valve 15, and each forward/reverse pedal 12F after switching the switching control valve 15. , 12H to rotate the accelerator lever 16 in the speed increasing direction.

(Function) When one of the forward/reverse pedals 10F, 10R is depressed, the forward/reverse operation force transmission means 40 is activated, the switching control valve 15 is switched to either the forward or reverse side, and the forward/reverse switching clutch 12F is activated. , 12R is activated to put the drive system power into a forward or reverse state.

When the forward/reverse pedals IOF, IOR are further depressed from the state in which the switching control valve 15 is switched, the accelerator operation force transmission means 48 starts operating, and the accelerator lever 16 is rotated according to the amount of depression. The speed of the driving system power is increased.

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

Fig. 4 shows the control section 2 of the tractor 1, with 3 a control handle, 4 a control seat, 5 a control panel at the rear of the hood,
6 is a hand accelerator lever, 17 is a pair of left and right rear wheel fenders, 8 is a left and right step, and on the right step are a brake pedal 9 and forward/reverse pedals IOF, IOR.
is located.

In FIG. 1, a tractor 1 has a built-in forward/reverse switching device for switching the driving system power back and forth, and 12F, 1
2R is a forward/reverse switching clutch that is operated by hydraulic pressure. The forward/reverse switching clutches 12F, 12R supply and discharge pressure oil from a hydraulic pump 14 driven by an engine 13 via a switching control valve 15, and operate selectively.

16 is an accelerator lever provided in the fuel injection pump device.
It can be rotated by the band accelerator lever 6, and the accelerator lever 16 and the switching control valve 1
5 can also be operated by pressing the forward/reverse pedals IOF and IOR.

The forward/reverse pedals IOF and IOR are pivotally supported on a support shaft 18 on the right step 8 so that they can be depressed independently.
Rotate OF, 2OR.

The left and right pedal arms 20 have boss portions 21F and 21R,
Each boss portion 21F, 21R is loosely fitted to a horizontal shaft 23 rotatably supported by a bracket 22 fixed to the lower surface of the step 8, and has an operating body 24F, 24R on each end surface thereof.

Each operating body 24F, 24R protrudes diametrically from the horizontal shaft 23, and has a cam plate portion 25F, 25R on one end side and an engaging portion 26F, 26R on the other end side.
A return spring 27 is stretched between.

A vertical axis 29 is provided on the lower surface of the step 8.
A midway portion of a band-shaped rocking body 30 is pivotally supported at 9. One end of this rocking body 30 is bent into an L-shape, and a cam follower 32 is pivotally supported via a front-rear shaft 31. The diameter of this cam follower 32 is larger than the interval between the left and right cam plate parts 25F and 25R, and It is provided so that the swinging body 30 is pushed around the vertical axis 29 via the cam lower 32 by the rotation of 25F and 25R.

The other end of the rocking body 30 is bifurcated and has a long hole 33 formed therein, and is engaged with a pin 35 provided on the push/pull body 34 . This push/pull body 34 is supported by a bracket 36 fixed to the step 8 so as to be slidable in the left and right direction, and includes a pair of balance springs 37F,
37R, the swinging body 30 and the push/pull body 34 are located at the center of the bracket 36.

This push-pull body 34 is connected to the spool 15a of the switching control valve 15 via a push-pull wire 38. For example, by sliding in the push direction, the push-pull body 34 pushes the spool 15a and operates the reverse side clutch 12R, and pulls the push-pull body 34. By sliding in the direction, the forward flange 12F is actuated.

Therefore, when the left reverse pedal IOR is depressed when viewed from above, the left pedal arm 2OR rotates, and the cam plate portion 25R of the left operating body 24H moves the rocking body 30 clockwise in FIG. 1 via the cam follower 32. When the right pedal arm 2OF rotates and the right operating body 24 is swung, the push/pull body 34 is pushed to activate the reverse clutch 12R, and the right forward pedal IOF is depressed.
The cam plate portion 25F of F is connected to the rocking body 3 via the cam lower 32.
0 in the counterclockwise direction in FIG. 1 to pull the push/pull body 34 and operate the forward clutch 12F.

The pedal arm 20, the cam plate portion 25 of the operating body 24, the rocking body 30, the push/pull body 34, the push-pull wire 38, etc. transmit the alternative depression operation of the forward/reverse pedals IOF and IOR to the switching control valve 15. A forward/reverse operation force transmission means 40 is configured.

A boss portion 43 of an accelerator arm 42 is fixed between the left and right operating bodies 24F and 24R of the horizontal shaft 23 via a pin 44, and an engagement rod 45 is attached to the tip of the accelerator arm 42.
is provided to protrude in the left-right direction, and this engagement rod 45 is connected to the left and right operating body 2.
It is possible to engage with the engaging portions 26F and 26R of 4F and 24H.

Further, a rotating arm 46 is fixed to the end of the horizontal shaft 23,
This rotating arm 46 is operatively connected to the accelerator lever 16 via a link means 47, and the link means 4
7, the operating force from the hand accelerator lever 6 is transmitted in the middle.

The retaining portion 26 engages with the engagement rod 45 at the latter stage of the depression of the forward/reverse pedals 10F, 10R, and at the beginning of the depression of the forward/reverse pedals IOF, IOR, the cam plate portion 25F engages with the engagement rod 45.
.

25R pushes the cam lower 32, and before and after the pushing of the cam lower 32 is completed, the engaging parts 26F and 26R push the engaging rod 4.
5, and then when the pedal is depressed, the accelerator arm 4
2 to rotate the accelerator lever 16 in the speed increasing direction.

The accelerator arm 42 rotates in the same way regardless of which of the forward/reverse pedals IOP, IOR is depressed, and the pedal arms 2OF, 2OR, the retaining portion 26 of the operating body 24,
The forward and backward movement pedals IOF and IOR are controlled by the accelerator arm 42, the horizontal shaft 23, the rotation arm 46, the link means 47, etc.
An accelerator operating force transmitting means 48 is configured to rotate the accelerator lever 16 in the speed increasing direction by the depressing operation.

It should be noted that the present invention is not limited to the embodiments described above, and can be modified in various ways. For example, the push/pull body 34 is provided with a cam body having a pair of cam surfaces, the left and right operating bodies 24 are provided with cam bins that come into contact with the cam body, and the push/pull body is moved by rotation of the operating body.
4 in a straight line, or the conventional accelerator pedal is placed below the forward/reverse pedals IOF, IOR, so that when the forward/reverse pedals IOF, IOR are depressed, the accelerator pedal is also depressed halfway. You can do it. In other words, the pedals IOF and IOR are the two throttle pedals, and the forward/reverse switching clutches 12F, 12R are activated by the free movement of the respective pedals.

(Effects of the Invention) According to the present invention described in detail above, the pair of forward and backward movement pedals 12
F, 12R, a forward/reverse operation force transmission means 40 that transmits the alternative depression operation of the forward/reverse pedals 12F, 12R to the switching control valve 15, and each forward/reverse pedal 12F after switching the switching control valve 15. , 12R, the accelerator operation force transmission means 48 rotates the accelerator lever 16 in the direction of increasing speed by pressing the pedals 12R, 12R, and 12R. , the switching control valve 15 can be operated to switch forward or backward, and then the accelerator lever 16 can be operated, making it possible to switch forward or backward and increase or decrease the vehicle speed at the same time as the control handle 3, work equipment control lever, etc. Therefore, the operability and safety of the vehicle can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall explanatory diagram, FIG. 2 is a sectional view taken along the line l1l-II in FIG. 1, FIG. 3 is a sectional front view of the main part, and FIG. 4 FIG. 2 is a perspective view of a tractor control section. 3... Control handle, 10... Forward/forward pedal, IO
F forward pedal, IOR...reverse pedal, 12F...
Forward switching clutch, 12R... Reverse switching clutch, 1
5...Switching control valve, 16...Accelerator lever 220
...Pedal arm, 23...Horizontal axis, 24... Operating body, 25... Cam plate part, 26... Holding part, 30...
- Oscillating body, 32... Camo lower, 34... Push/pull body,
40... Forward/forward operation force transmission means, 42... Accelerator arm, 45... Engagement rod, 48... Accelerator operation force transmission means. Ci=two

Claims (1)

[Claims] (1) In a running vehicle having a switching control valve (15) for selectively operating the forward/reverse switching clutches (12F) (12R), and an accelerator lever (16) for increasing/decreasing the traveling speed, a pair of front and rear forward/reverse operation force transmission means (4) for transmitting the alternative depression operation of the forward/reverse pedals (12F, 12R) to the switching control valve (15);
0), and an accelerator operation force transmission means (48) that rotates the accelerator lever (16) in the speed increasing direction by pressing the forward and backward pedals (12F) (12R) after switching the switching control valve (15). ) A traveling operation device for a traveling vehicle, characterized in that it has the following.