JPS61261129A - High-speed reversing control device for forward-reverse vehicles - Google Patents

Abstract

PURPOSE:To prevent an unexpected accident, by providing a high speed backward traction limiting device for preventing a tractor from moving backward at a high speed, on the left side of a mission casing, so that there is eliminated such a risk that a vehicle is moved backward at a high speed. CONSTITUTION:A first and second speed shift lever 34 and a third and fourth speed shift lever 36 for a main speed change gear are fixed on lever shafts 36, 37 on the left side of a mission casing 3, and are associatingly coupled to the main speed change gear by means of connecting rods 39, 40. Further, a high speed rearward traction limiting device 45 for preventing a vehicle from being moved backward at a high speed during drive in the for ward or rearward directed condition, is disposed on the left side of the casing 3. A stopper section 90 projected outward and formed in a bent shape is attached to the lower end section of the front end part of a stationary plate 47 on the device 45, and the stopper section 90 and both longitudinally front and rear ends of a limiting section 88 prevent a limiting plate 85 from being rotated about a pin 84 exceeding a predetermined value.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a high-speed reversing restraint device for a forward-reverse vehicle such as a tractor.

<Prior art> In a tractor that can freely change its position between a forward-facing driving position and a backward-facing driving position, in addition to conventional transmissions, such as a main transmission and an auxiliary transmission, there is a dedicated transmission that only switches between forward and backward movement. Some vehicles have a forward/reverse switching device built into the travel system. This is because the forward and backward movement can be performed by simply operating the forward and backward switching lever, which has the advantage of significantly improving work efficiency for tractors that frequently repeat forward and backward movement, particularly for forward and backward movement type tractors.

However, in the past, in each driving position Ktd was able to move forward or backward by the number of gears of the transmission.
However, in each driving position, there is no means for preventing the transmission from being placed in the high-speed position and the forward/reverse switching device from being placed in the reverse position. (In the above case, reversing means moving the tractor toward the rear of the driver sitting in the driver's seat in each driving position.) Problems to be Solved by the Invention For this reason, In each driving position, an accidental gear change operation could cause the vehicle to travel backwards at high speed, leading to an unexpected accident.

The object of the invention is to eliminate the risk of the axle moving backward at high speed due to an accidental gear change operation in each driving position, thereby eliminating the risk of causing an unexpected accident.

<Means for Solving the Problems> In order to achieve the above object, the present invention is characterized in that a transmission device 422 e! 31 For a forward/reverse type vehicle that is equipped with an M and a forward/reverse switching device (21) and is capable of changing its position between a forward-facing driving position and a backward-facing driving position, the transmission panel (to) (Foundation) is installed in each driving position. The present invention is provided with a means (4119) for preventing the vehicle from entering the high-speed position and the forward/reverse switching lever) from entering the reverse position.

According to the present invention, when the transmission device t22f231 (Incorporated) is in the high speed position in the forward or reverse driving position, the forward/reverse switching lever 9 does not go into the reverse position, and the forward/reverse driving type vehicle f!
Le! When 11 is in the reverse position, the transmission is not in the high speed position, and therefore the vehicle does not travel in reverse at high speed.

<Embodiment> Hereinafter, a first embodiment in which the invention is applied to a forward-reverse type tractor will be explained based on the drawings of FIGS. 1 to 8. In FIG. 2, (1) is a tractor body, and an engine (2) and a transmission case (3), etc., and the engine (2) is covered by a bonnet (b). A hydraulic device (4) for lifting and lowering the work machine is mounted on the rear upper surface of the mission case (3). (6) is a step, (6
) is the front wheel, and (7) is the rear wheel. (8) is a pair of left and right rear wheel fenders, and (9) is a floor sheet that connects both rear wheel fenders (8), covering the upper part of the hydraulic system (4), etc.

The flol H gate ffg-shaped cover is externally fitted onto the front part of the transmission case (3) from above to cover the front part. (2) is a box provided at the rear end of the bonnet (B), and (2) is a cover provided on the box (2) in a manner that it can be raised and lowered. (B) is a door that can be opened and closed, and is arranged between the right side of the box (2) and the right rear wheel fender (8).

The tractor is capable of changing its position between a forward driving position and a backward driving position, and therefore the following configuration is adopted.

That is, in the widthwise central part of the floor seat (9) and the rear of the top plate of the box (6), there is a mounting part (14F) for forward driving, respectively.
) and 6, and a mounting part (14R) for backward operation are provided, and each mounting part (14F') (14R) is equipped with an equipment body (
The driver's seat (2) is removably installed in the forward or rearward direction via the (g).

In addition, a mounting base for forward operation (16F) and a mounting base for rearward operation (laR) are provided on the upper surface of the mission case (3) and the negative side of the hydraulic system (4), respectively. , to these mounting bases C16F'IC16R'), a hand lever boss Q16 that supports the handle aη is detachably attached.

Furthermore, a clutch pedal α9 for forward driving is mounted on the vehicle body [11].
A brake pedal, a clutch pedal for reverse driving, and a brake pedal (E) are provided.

As shown in Figure 3, inside the mission case (3),
A hydraulic clutch-type forward/reverse switching device (2) for the traveling system, a main transmission, a sub-transmission, and a super speed reduction device (241) are built-in.

The forward/reverse switching device r2J is connected to the engine (2) via a clutch (c) and is switched between a forward position and a reverse position.

The main transmission is a 4-speed transmission, with a group of gears on the main shaft linked to the engine (2), a group of gears that are freely rotatable on the gear shaft and are silent, and are constantly connected. It consists of a group of free rotating gears that engage.

The sub-transmission device (24) and the super-reduction device (24) each have two high and low gear speeds, and the super-reduction device (24) is interposed between the main transmission device (2) and the outside of the sub-transmission device.

As described above, the running system is capable of shifting in 16 steps both forward and backward, and is interlocked with the rear wheels () via the differential mechanism (A).

As shown in Figures 1 and 4, the mission case (
3) is equipped with a hydraulic control valve (2) for controlling the forward/reverse switching device (2), and an interlocking lever lever force provided to the control valve ell via a lever shaft (to) is provided. The control valve slide is operated by being rotated by the forward/reverse switching lever via the interlocking rod.

Also, on the left side of the central part in the longitudinal direction of the mission case (3), there are the levers for 1st and 2nd speeds of the main transmission (2),
3rd and 4th speed levers are fixed to the lever 11η, respectively,
Each of these levers H@f9 is interlocked and connected to the main shift lever via an interlocking gear.

Furthermore, at the rear of the above lever (goods), there is a super deceleration device (goods).
An interlocking lever (42) fixed to a lever shaft U that interlocks with the auxiliary transmission, and an interlocking lever fixed to a lever shaft (431) interlocking with the inside of the sub-transmission device are arranged toward the rear in the above order. has been done.

On the left side of the mission case (3), there is a
A high-speed backward movement restraining device is provided to prevent the tractor from moving backward at high speed during each backward driving position.

Note that in this case, the term "reverse travel" refers to traveling in a backward direction toward the rear of the driver sitting in the driver's seat in each driving position.

To explain the above-mentioned restraint device, as shown in Figs. It is attached to the left side of the mission case (3) (48), and the upper part, the vertical center part, and the lower part are
Upper, center, and upper elongated holes (C) TI (521131) are formed in the approximately front-rear direction, respectively.

(54) is a rotating plate, which is placed in front between the fixed plates and is attached to the left side of the mission case (3) with a horizontal support shaft (i5a).
is rotatably provided with a front end of an upper end thereof;
The interlocking lever @force is connected by a telescopically adjustable forward/backward first check link ■ and a connecting shaft (shaft) link.

The rear part of the rotating plate (54) has a substantially arc-shaped long hole (5
A long hole (571) is formed in the vertical direction, and the vertical midway part of the long hole (571) is a moving part, and the upper and lower ends of the long hole are circular upper and lower positioning parts with a diameter larger than that of the moving part. It is said to be the most popular.

The members at the center of the restraining device in the longitudinal direction, that is, the fixed plate (η), rotating plate, etc., are covered by the cover flQIK.

6 is the second forward and backward movement restraint link, and the bottle wheels provided at each end of the front and rear are located in the long hole (5η) of the rotating plate and one in the upper long hole IBυ of the fixed plate (4η). It is inserted so as to be freely movable in the longitudinal direction.

The pin ■ is made to protrude largely outward from the elongated hole of the rotating plate (corporate), and protrudes outward from the window formed in an arc shape on the left side wall of the cover (lα). 1- is a retaining member which is fitted around the pin so as to be movable in the axial direction, and its inner end is a retaining portion (@) which has a small diameter in the middle in the axial direction.

The retaining part can be releasably engaged with each positioning part vlIrA by moving the retaining member in the axial direction, but the engaging part ■ moves through the moving part of the elongated hole Gη. The size is so large that it cannot be fixed, and each positioning part -rillI
By engaging K, the pin transfer is done at each positioning part-II3.
fixed at υ.

The outer end of the retaining member is a gripping portion having a larger diameter than the midway portion in the axial direction, and protrudes outward from the window portion.

The ring is a collar, and is fitted onto the outside of the pin ■ and the engaging member ■ so that it can move freely in the axial direction, and is fitted onto the pin #4.
This prevents it from slipping out to the outside.

(to) is a compression coil spring, which is inserted in a resilient manner between the inner end of the retaining member of the pin and the collar, to move the retaining member inward, that is, to each positioning portion can @. It is biased in the direction of engagement.

(C) is a pair of front and rear guide rails, which are arranged vertically on the outer surfaces of both the front and rear sides sandwiching the window on the left side wall of the cover.
A cover (c) for fully opening and closing the window portion is fitted onto these guide rails (c) so as to be movable in the vertical direction.

By opening the cover (c), the retaining member can be operated.

(C) is an 8/4-speed check link, whose front end is pivotally connected to the 8/4-speed lever (31) by a pink 4, and the pin (C) shown at the rear end is a fixed plate (4-speed lever). It is inserted into the upper elongated hole so as to be movable in the longitudinal direction.

ff9 (c) is a sub-degree shift first and second check link, which is also used as the super deceleration first and second check link.

The rear end of the sub-shift first check link fQ is the lever shaft←11
It is pivotally connected to the provided auxiliary transmission check lever (C) by a pin 4, and a long hole in front of the link Q is formed in the longitudinal direction of the link Q.

(g) The super-deceleration check lever is fixed to the lever shaft, and the lever @1) K biased pin is inserted into the elongated hole ■ of the sub-transmission first check link fQ in the longitudinal direction. It is movably inserted into the

The rear end of the auxiliary transmission second restraint link (c) is pivotally connected to the front end of the auxiliary transmission first restraint link 10 by a pin (83'lK),
A pin provided at the front end of the auxiliary transmission second check link (c) is inserted into the central elongated hole of the fixed plate (η) so as to be movable in the longitudinal direction.

■ is a vertically elongated plate-shaped restraining plate, whose vertical center is rotatably attached to a pin, and its upper and lower ends are respectively located in front of each pin branch (c). To position.

By the way, the front end of the sub-transmission second check link (c) is interposed between the check plate (rope and the fixed plate 171), and the front end of the sub-transmission second check link (c) is interposed between the check plate (rope and the fixed plate 171). Since there is a relatively large gap, rattling of the check plate in the left and right direction becomes a problem.

Therefore, on the upper part of the fixing plate ←η, plate-shaped regulating fittings elongated in the front and back direction are removably attached with Bordeaux at both front and rear ends. The middle part of the restriction fitting (A) in the front-rear direction is a two-shaped restriction part protruding outward in plan view, and the restriction part is fitted over the upper part of the check plate.

In addition, a regulating piece (A) located between the fixing plate (4η) is fixedly installed on the inner surface of the blocking plate (closing part), and the regulating piece (89) and the outer part of the regulating part (The rattling in the horizontal direction of the bleaching is regulated.

In addition, at the lower end of the front end of the fixing plate (471), a stopper part (9) is bent and formed to protrude outward, and the stopper part!
1 and both front and rear ends of the regulating portion □□□ prevent the check plate □ from rotating more than a predetermined amount around the pin (84).

According to the embodiment configured as described above, when in the forward driving position, the driver's seat ■ is placed in the forward driving mounting portion (14F'), and the handlebar post 0 is placed in the forward driving position, as shown by the imaginary line in FIG. At the same time as attaching the 6th
As shown in the figure, the pin (to) is fixed to the lower positioning portion rSα of the elongated hole (material) of the rotating plate (material) by a retaining member (51).

In the above state, by operating the forward/reverse switching lever, the interlocking lever is moved from the neutral position (5) in Figure 1 to the forward rotation position (g) or rearward through the interlocking lever (to). By rotating K to the rotation position 0, the hydraulic control valve e+t+ is operated, and the forward/reverse switching device (21) is switched from the neutral position to the forward position or the reverse position.

In addition, by the rotational operation of the interlocking lever holder, the rotating plate (54) is rotated around the support shaft M via the forward and backward movement first check link.
), the pin face is moved from the neutral position box at the center of the upper elongated hole υ to the rear movement position 0 or the front movement position (2).

On the other hand, the main gear shift lever causes 3
・Move the 4th gear lever (to) from the neutral position (5) in Figure 1 to the front 4th gear position (4S) or the rear 3rd gear position (3S) K.
By rotating, the main transmission is switched to the 4th speed position or the 3rd speed position.

Also, by rotating the 3rd and 4th speed levers (to), the pin (c) is moved from the neutral position opening in the center of the upper elongated hole to the front side via the 8th and 4th speed check links (c). It is operated to move to the 4th gear position (4s) or the rear 3rd gear position (3S).

On the other hand, the auxiliary gear shift lever moves the interlocking lever (goods) to the first gear shift lever.
By rotating from the neutral position shown in the figure to the front high speed position 0 or the rear low speed position Ω, the sub-transmission device (a) is switched from the neutral position to the high speed position or the low speed position.

Further, by rotating the interlocking lever (B), the sub-shift control lever (C) changes from the neutral position (2) in FIG. 1 to the rear high speed position (2) or the front low speed position υ.

On the other hand, the super deceleration lever moves the interlocking lever (6) to the first
By changing from the neutral position on the snow surface shown in the figure to the high-speed position ■ on the rear side or the low-speed position flυ on the front side, the super deceleration device can be switched from the neutral position to the high-speed position or the low-speed position.

Also, by rotating the interlocking lever (42), the super deceleration check lever @l is rotated from the neutral position shown in Fig. 1 to the front high speed position plane or the rear low speed position (G), and the pin ( (b) moves within the slot (e) and does not interfere with the operation of the auxiliary transmission.

Then, when both the sub-shift check lever (c) and the super-deceleration check lever (see above) reach the high-speed position, the sub-shift check lever (c)
・Through the second check link (c), the pin (goods) is connected to the check position (9) located on the rear side of the central elongated hole (52) of the fixed plate
).

Also, when the auxiliary transmission check lever (c) is in the high speed position ■ and the super deceleration check lever @1) is in the low speed position υ, the pin is in the check release position on the front side of the check position surface, and both check levers ( C) Unless both (81) are in the reverse speed position (■), the pin @4) will not be in the check position (2).

For example, when the forward/reverse switching device (21) is in the forward position, the main transmission is in the 4-speed position, and the auxiliary transmission and the super reduction gear (241) are each in the high-speed position, the traveling system is It becomes the forward position of maximum speed.

In this state, when the forward/reverse switching device (211) is operated to the reverse position, the pin branch moves to the forward movement position, and the check plate
Rotate around the pin (&4) to take forward leaning restraint posture (O).

As a result, the pin (C) is moved back from the 4th gear position (4s) to the neutral position (5)K, and this movement of the pin (C) causes the 8.
The 3rd and 4th speed levers are returned to the neutral position (g) via the 4th speed check link (c), and the main transmission is placed in a neutral position.

Conversely, when the forward/reverse switching device (211) is in the reverse position, the auxiliary transmission and the super reduction gear are in the high speed position, and the main transmission is in the 4th speed maximum speed position. To do this, the pin (c) moves to the 4th gear position (4s), and the check plate side is rotated around the pin (841), so that the check plate (exposed) is in the rearward check position.

As a result, the pin branch is returned from the front movement position [F] to the neutral position plane, and due to the movement of this pin H, the rotation plate (i541, the second forward and backward restraint link 61), Through this, the interlocking lever (support) becomes the neutral position (2), and the forward/reverse switching device (21) becomes the neutral position.

Therefore, when the vehicle is in the forward driving position, the travel height system will not be in the reverse position at the highest speed, and there is no risk that the tractor will run backwards at high speed and cause an unexpected accident.

In addition, if the pin ((to) is at the check release position β etc.,
The check plate +811i1 does not act as a check against the pin junction (C), but allows the pin @ (C) to move freely.

Next, when in the rearward driving position, as shown by the solid line in Fig. 2, the driver's seat (C181) is attached to the rearward driving mounting part (18), and the handle boss (C181) is attached to the rearward driving mounting base (16R) K, respectively. At the same time, as shown in Figure 5, insert the pin □ into the rotating plate (
54) is fixed to the upper positioning part (2) of the elongated hole (5η) with the retaining member (to) 1.

In this state, when the interlocking lever handle is operated from the neutral position (6) to the front rotation position (2) or the rear rotation position, the forward/reverse switching device T211 is switched from the neutral position to the reverse position or the forward position.

In this case, moving the tractor in front of the driver sitting in the rear is called forward movement, and the opposite is called backward movement.

Therefore, when the interlocking lever (Co., Ltd.) is operated from the neutral position □ to the forward rotating position [F] or the rear rotating position ■ as described above, the pin junction will be the same as when driving forward. On the other hand, from the neutral position plane to the front movement position (■) or the rear movement position (■).

When the auxiliary transmission and the super reduction gear are in a high speed position during reverse driving, the pin (c) is in the forward movement position, and the pin (c) is in the 4th gear position (4s).
) This is prevented by a check plate (exposed), and even when driving backwards, the driving system will not go into the maximum reverse position.

FIG. 9 shows a second embodiment of the present invention, in which the rotating plate l1
A 541K swing lever 61111 is swingably attached to a support shaft, and a second forward/reverse restraint link 61) is pivotally connected to one end of the swing lever button (the swing lever button) by a pin 132, and a solenoid, etc. is attached to the other end. Actuating device (@ is connected.

The actuating device is pivotally supported on the rotating plate by a support shaft, and the actuating device is controlled by a switch provided on each mounting part (14F') (1 piece). .

That is, as shown by the imaginary line in FIG. 9, when the driver's seat is attached to the forward driving mounting part (14F'),
When the lever is activated, the swing lever @11 is rotated downward via the actuating device (931), and the second forward-reverse movement check link 6TJ is placed in the forward position.

Also, when the first driver's seat (A) is attached to the rearward driving mounting part (14R) as shown by the solid line in FIG. dynamic lever button)
rotates upward, and the second forward/reverse motion restraining link 61) assumes a backward motion position.

<Effects of the Invention> As detailed above, according to the present invention, there is no risk that the vehicle will run backwards at high speed due to an accidental gear change operation in each driving position, and there is no risk of an unexpected accident occurring. There isn't.

The present invention has the above advantages and is a real advantage.

[Brief explanation of the drawing]

1 to 8 show a first embodiment of the present invention, FIG. 1 is a side view of the main parts, FIG. 2 is an overall side view, FIG. 3 is a configuration diagram of the mission, and FIG. 4 is a main part. FIG. 5 is a partially enlarged view of FIG. 1, FIG. 6 is a side view showing a different position from FIG. 5, and FIG. 7 is a partially enlarged view of FIG. FIG. 8 is a sectional view taken along the line ■--■ in FIG. 5, and FIG. 9 is an explanatory diagram showing a second embodiment of the present invention. (1)... Tractor body, (21)... Forward/forward switching device, □□□... Main transmission, (To)... Sub-transmission, (24)... Super reduction gear, (46...high-speed reverse restraint device, frame...driver's seat.

Claims (1)

[Claims] 1. In a forward-reverse type vehicle that is equipped with a transmission (22) (23) (24) and a forward/reverse switching device (21) in its driving system, and is capable of changing its position between a forward-facing driving position and a backward-facing driving position, Transmission device (22) (23) (24) when in driving position
) is in a high-speed position and the forward/reverse switching device (21) is in a reverse position.