JPS6334988Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an accelerator device for a forward-reverse vehicle, and aims to eliminate various restrictions related to the accelerator pedal for backward driving, and to enable accurate operation using the pedal.

In a forward-reverse type vehicle that can drive forward and backward, the hand accelerator lever and accelerator pedal for forward driving are interlocked with the engine speed adjustment lever via an interlocking mechanism, and the hand accelerator lever and accelerator pedal for forward driving are interlocked and connected to the engine speed adjustment lever via an interlocking mechanism. Equipped with an accelerator pedal. By the way, the accelerator pedal for forward driving and the interlocking mechanism are placed on the right side of the vehicle body, and the accelerator pedal for backward driving is placed on the left side of the vehicle body, with the former side and the latter side being placed quite apart. ing. However,
Conventionally, the accelerator pedal for backward driving was connected to the interlocking mechanism by an interlocking rod, so it was necessary to secure a space to allow the movement of the interlocking rod, and the position of the accelerator pedal for backward driving was also quite large. Moreover, since the interlocking rod is bent considerably, the bent part of the interlocking rod may deform when operating the accelerator pedal for reverse driving, making it difficult to operate the pedal. There was also the problem that it was difficult to accurately transmit information to the engine speed adjustment lever, making precise operation impossible.

The present invention solves the above problems and further simplifies the structure of the linking mechanism between the three accelerator operating means - the hand accelerator lever, the forward driving accelerator pedal, and the reverse driving accelerator pedal - and the engine speed control lever. Its features are that in a forward/reverse type vehicle which can be driven in both forward and reverse, a single accelerator link to which the hand accelerator lever, the forward driving accelerator pedal, and the reverse driving accelerator pedal are linked and can swing freely, and via this accelerator link the hand accelerator lever, the forward driving accelerator pedal, and the reverse driving accelerator pedal are each linked and connected to the engine speed control lever, and further the reverse driving accelerator pedal and the accelerator link are linked and connected via a flexible rope.

An embodiment in which the present invention is applied to a four-wheel drive agricultural tractor will be described below with reference to the drawings. Reference numeral 1 denotes a tractor body, which is mainly composed of an engine 2, a clutch housing 3, a transmission case 4, etc.; is covered by the bonnet 5.
Reference numeral 6 designates an auxiliary box at the rear of the bonnet 5, which is provided with a fuel tank 7 therein and a lid 8 that can be opened and closed at its upper part. The auxiliary box 6 extends laterally from the center in the width direction of the vehicle body 1, and a main switch 9 is provided on the center side in the width direction of the auxiliary box 6, but a stop button 10 for stopping the engine 2 is attached to the auxiliary box. The engine is disposed on the upper surface of the lateral protrusion of 6, so that the engine can be immediately stopped both when driving forward and when driving backward. . A pair of left and right steps 11 projecting laterally are fixedly installed on both sides of the mission case 4. As shown in FIG. 7, if an upwardly projecting wall 12 is integrally formed around the step 11 except for the vehicle body side, it is possible to considerably prevent muddy water from entering the upper surface of the step 11. 13 is an opening/closing valve, and a drain hole 14 formed in the step 11
is removably closed. Mission case 4
A hydraulic system 15 for lifting and lowering the work machine is mounted on the rear upper surface of the machine. 16 is a pair of left and right rear wheel fenders 1
7 and is fixed to a step 11 and a hydraulic system 15. floor sheet 16
A midway portion in the front-rear direction is an equipment portion 18 that slopes slightly upward in the rearward direction. Reference numeral 19 denotes a seat, which is provided at the center in the width direction of the equipment section 18 as shown by the solid line in Figures 1 and 2 when driving forward, and as shown by the imaginary line in the above figures when driving backward. As shown, the opening/closing lid 8 is provided on the auxiliary box 6 in an upright state. Further, both sides of the transmission case 4 and the equipment section 18 are provided with operating pedals 20 for forward driving or backward driving. Reference numeral 21 denotes a speed change box, which is disposed so as to be openable and closable between the right side fender 17 and the right side protrusion of the auxiliary box 6, and is provided with various speed change levers 22. 23 is a front wheel, and 24 is a rear wheel.

Reference numeral 25 denotes an upright post column bolted onto the vehicle body 1, and is constructed by connecting a lower column 27 with a mounting base 26 and an upper column 28. The upper support column 28 has a U-shaped frame shape, and a post receiver 29 is bolted to the upper end thereof, and a steering post 30 is erected and fixed to the post receiver 29. In this case, the post 30 is removable together with the post receiver 29, and the position can be changed to the mounting position during rearward driving. The post 30 includes a handle 31 and a handle shaft 32, and the handle shaft 32 is connected to an interlocking mechanism in a gearbox 34 via a relay joint 33, so that the front wheels 23 can be steered.

At the upper right side of the lower support column 27, a first mounting plate 35 is installed.
is provided to protrude forward, and a second mounting plate 36 is provided at a midway point in the height direction so as to protrude toward the right side and the front side.
A horizontal lever shaft 37 is rotatably supported at the front end portions of both the mounting plates 35 and 36. The lever shaft 37 is prevented from coming off by a ring 38 on the left end side, and a spring 39 and a boss 41 of a hand accelerator lever 40 for forward operation are fitted on the right end side, and by appropriately tightening with a nut 42, the accelerator The lever 40 can be held at an appropriate rotational position. An interlocking cylinder 43 is loosely fitted into the lever shaft 37 midway in the length direction.
A pair of circumferential elongated holes 44 are formed at a radially symmetrical location in the axial center of the interlocking cylinder 43, and an interlocking pin 45 inserted into the lever shaft 37 is inserted into these elongated holes 44. . An accelerator link 46 is integrally formed at the inner end of the interlocking cylinder 43, and the link 46 has an upper protrusion 47, a rear protrusion 48, and a lower protrusion that respectively protrude from the interlocking cylinder 43. It has 49. 50 is a downward protrusion 49
The downward protrusion 49 is a return spring that elastically pulls the
and a hook plate 51 provided below from the second mounting plate 36. 52 is an accelerator rod, which controls the speed adjustment lever 53 of the engine 2 and the downward protrusion 4.
9 are interlocked and connected. The speed adjustment lever 53 is rotatably provided around the vertical axis. 54 is the accelerator pedal for forward driving, right side step 11
It is provided on the front end side so as to be freely depressed, and is interlockingly connected to the rear protrusion 48 via an interlocking rod 55. 56 is a return spring.

Reference numeral 57 denotes an accelerator pedal for backward driving, which is disposed on the left side of the vehicle body 1, that is, on the left side of the hydraulic system 15 in the equipment section 18, and can be freely depressed into the equipment section 18 via a bracket 58 below the equipment section 18. Supported. 59 is a return spring. 60 is a push-pull wire illustrated as a flexible cable, which interlocks and connects the accelerator pedal 57 for backward driving and the accelerator link 46, and each end of the outer wire 61 is connected to the second mounting plate 36 and the accelerator link 46. Equipment section 18
It is locked to via support plates 62 and 63. One end of the inner wire 64 is connected to a connecting fitting 65,
It is connected to the upper protrusion 47 via a connecting pin 66, and the other end is connected to a connecting fitting 67 and a connecting pin 68.
is connected to an interlocking lever 69 fixedly attached to the accelerator pedal 57 for backward driving. A long hole 70 in the front-back direction is formed in the connecting fitting 65, and a connecting pin 68 is inserted into the long hole 70 so as to be movable in the front-back direction, so that the push-pull wire 60 and the accelerator pedal 57 for backward driving , so as not to interfere with the operation of the hand accelerator lever 40 or the forward driving accelerator pedal 54.

According to the embodiment configured as described above, when performing a speed increase operation using the accelerator pedal 57 for backward driving when driving backward, the pedal 57 is depressed, and thereby the push-pull wire etc. 60, the accelerator link 46 rotates, and the speed adjustment lever 53 is rotated forward through its downward protrusion 49 and the accelerator rod 52, and the engine 2
speed up. In this case, the accelerator pedal 54 for forward driving is synchronized, but the elongated hole 44 of the interlocking cylinder 43
Therefore, the hand accelerator lever 40 is not synchronized.

Also, when driving forward, when increasing speed using the forward driving accelerator pedal 54, the pedal 54 is
This causes the interlocking rod 55 to
, the accelerator link 46 rotates to increase the speed of the engine 2 in the same manner as described above. In this case, similarly to the above, the hand accelerator lever 40 is not synchronized, and the connecting pin 66 is connected to the long hole 75 of the connecting fitting 65.
By moving the inner part to the rear side, the accelerator pedal 57 for backward driving is also not synchronized.

Furthermore, when operating the hand accelerator lever 40 to increase the speed, the lever 40 is rotated rearward, and as a result, the accelerator link 4 is
6 rotates, and the speed of the engine 2 is increased. In this case, the forward driving accelerator pedal 54 is synchronized, but the backward driving accelerator pedal 57 is not synchronized. Note that while the hand accelerator lever 40 is being operated, the lever 40 is connected to both accelerator pedals 54 and 57.
The accelerator link 46 is made to respond preferentially to the side. That is, due to the presence of the elongated hole 44, the hand accelerator lever 40 can be operated regardless of whether the accelerator pedals 54, 57 are depressed.

As detailed above, in the present invention, the accelerator pedal for reverse driving is interlocked and connected to the speed adjustment lever side of the engine via a flexible cable. There is no need to secure space to allow the movement of the rod, and
There is no restriction on the arrangement of the pedals, and moreover, accurate operations can be performed using the pedals. Further, the hand accelerator lever, the forward driving accelerator pedal, and the backward driving accelerator pedal are all operatively connected to the speed adjustment lever via a single accelerator link. In this way, by interlocking and connecting the three accelerator operating means and the engine speed adjustment lever through a single member, the number of parts of the interlocking mechanism can be reduced and assembly can be facilitated. .

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a side view of the entire tractor, FIG. 2 is a perspective view of the center of the tractor, FIG. 3 is a side view of the same, and FIG.
5 is a sectional view taken along the line B-B in FIG. 4, FIG. 6 is a partially sectional side view of the rear part of the tractor, and FIG. 7 is a rear sectional view showing another example of the step. . 1... Tractor body, 2... Engine, 19...
... Seat, 37 ... Lever shaft, 40 ... Hand accelerator lever, 43 ... Interlocking cylinder, 46 ... Accelerator link, 52 ... Accelerator rod, 53 ... Speed adjustment lever, 54, 57 ... Forward driving・Accelerator pedal for backward driving, 55... Interlocking rod, 6
0...Push pull wire.

Claims (1)

[Scope of utility model registration request] In a forward-reverse type vehicle capable of driving forward and backward, a single accelerator link is swingably provided to which a hand accelerator lever, an accelerator pedal for forward driving, and an accelerator pedal for backward driving are interlocked and connected. , Through this accelerator link, the hand accelerator lever, the accelerator pedal for forward driving, and the accelerator pedal for backward driving are interlocked and connected to the speed adjustment lever of the engine, and furthermore, what is the accelerator pedal for backward driving and the accelerator link? An accelerator device for a forward-reverse vehicle, characterized in that the accelerator device is interlocked and connected via a flexible cable.