JPH0318772Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a high-speed reversing restraint device for a vehicle such as a tractor.

<Prior Art> In vehicles such as tractors, in addition to the conventional transmission mechanisms for the traveling system, such as a main transmission mechanism and an auxiliary transmission mechanism, a forward/reverse switching mechanism that exclusively performs switching between forward and backward travels has been added to the traveling system. There is something included. This has the advantage of significantly improving work efficiency in tractors and the like that frequently repeat forward and backward movement, since the vehicle can be moved forward and backward by simply operating the forward/reverse switching lever.

However, in the past, although it is possible to move forward or backward by the number of gears of the transmission mechanism, there is no means for preventing the transmission mechanism from going into a high-speed position and the forward/reverse switching mechanism from going into a reverse position. Ta.

<Problems to be solved by the invention> For this reason, there was a risk that an accidental gear change operation would cause the vehicle to run backwards at high speed, leading to an unexpected accident.

The purpose of the present invention is to eliminate the risk of the vehicle traveling backwards at high speed due to an accidental gear change operation, thereby eliminating the risk of causing an unexpected accident.

In order to achieve this purpose, it is also an object that the device can be installed even in a narrow space, and that there is less difficulty in getting on and off the vehicle.

<Means for Solving the Problems> The technical means taken by the present invention to achieve the above-mentioned purpose is that in a vehicle equipped with a transmission mechanism and a forward/reverse switching mechanism in the running system, the transmission mechanism is in a high-speed position. A link-type operation check mechanism that prevents the forward/reverse switching mechanism from moving backward is provided on the outer surface of the vehicle body. It is equipped with a restraint fitting that performs restraint via pins that engage with restraint slots formed on the top, middle, and bottom of the restraint plate,
A check lever link is attached to the top, middle, and bottom of the check metal fitting so as to operate in the longitudinal direction of the vehicle body.

<Operation> According to the present invention, when the transmission mechanism is in the high-speed position, the forward/reverse switching mechanism does not go into the reverse position, and when the forward/reverse switching mechanism is in the reverse position, the transmission mechanism does not go into the high-speed position. Therefore, the vehicle does not travel backwards at high speed.

In addition, since the link-type operation restraining mechanism is attached to the vehicle body so as to operate in the longitudinal direction, it does not protrude significantly in the lateral direction, and there are fewer problems when getting on and off the vehicle.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 6, a tractor to which the present invention is applied is illustrated, in which 1 indicates a tractor body, 2
3 is a front wheel, 3 is a rear wheel, 4 is a bonnet, 5 is a steering wheel device, and 6 is a driver's seat.

The tractor body 1 consists of a transmission case 7, etc., and inside the transmission case 7, as shown in FIG. 11 mag is built in. The main transmission mechanism 8 includes a gear group 13 on a main shaft 12 that is interlocked with the engine E, an idling gear group 15 that is fitted onto a speed change shaft 14 so as to be freely rotatable, and is always engaged with the gear group 13.

The forward/reverse switching mechanism 9 is located between the super deceleration mechanism 11 and the auxiliary transmission mechanism 10, and in this embodiment, the driving system is capable of shifting in 16 steps both forward and backward, and the rear wheel 3 is connected to the rear wheels 3 via the differential mechanism 16. is linked to.

Referring to FIGS. 1 to 5, at the bottom of the handle device 5 there are relay parts 19 and 20 that are linked to the first to fourth shift levers 17 and 18 of the main transmission mechanism 8 that are linked to an operation lever (not shown). and the first for forward/forward switching.
A relay section 21 is provided.

The first and second shift levers 17 are interlocked and connected to a relay section 19 via a turnbuckle-shaped interlocking rod 22, and the third and fourth shift levers 18 are interlocked and connected to a relay section 20 via a turnbuckle-type interlocking rod 23. There is.

The first and second shift levers 17 are for operating a shifter on the shift shaft 14, and the third and fourth shift levers 18 are for operating another shifter on the shift shaft 14. 17 and 18 are also supported on the outer surface of the mission case 7 so as to be rotatable in the front and rear directions.

24 is a check plate, which is attached to the outer surface of the mission case 7 with mounting bolts, etc.
This restraint plate 24 has a long restraint hole 26 for the switching pin 25 of the forward/reverse switching mechanism 9 in the upper part, and a restraint length in the middle that is linked to each shift lever 27, 28 of the super deceleration mechanism 11 and the sub-transmission mechanism 10. A hole 29 is formed in the lower part, and a restraining elongated hole 30 for third and fourth speeds is formed respectively.

Reference numeral 31 denotes a second relay section for switching forward and backward movement, which is interlocked with the first relay section 21 through a turnbuckle type rod 32, and is pivotally supported on the upper side surface of the mission case 7 so as to be swingable in the front and rear directions. ing.

Then, this second relay portion 31 and the switching pin 2
5 are interlocked and connected by a check lever link 33.

34 is a third and fourth speed check lever link, which connects the third and fourth speed change levers 18 and the pin 3 on the check long hole 30.
5 are interlocked and connected.

36 is a second sub-shift check lever link;
The rear end is pivotally supported on the sub-shift lever 28 by a pin 37,
The front end side has a long hole 39 in which a pin 38 of the super deceleration lever 27 engages.

40 is a first sub-shift check lever link;
The front end is fitted with a pin 4 in the restraint elongated hole 29 of the restraint plate 24.
1, and the rear end is connected to the aforementioned second sub-shift check lever link 36 by a pin 42.

43 is a restraining metal fitting, and a pin 41 connects the restraining elongated hole 2.
9, and the forward and backward movement check lever link 3
3 pin 25 and pin 3 of the 3rd and 4th gear shift lever 18
5, respectively.

That is, as shown in FIG. 2, the super deceleration lever 27 can be switched between high speed H (including neutral) and low speed L around the horizontal axis 27A by operating an operating lever (not shown) in the front and back direction of arrow A. Further, the sub-shift lever 28 can be freely switched between high speed H including neutral N and low speed L around the horizontal axis 28A by operating an operating lever (not shown) in the front and back direction of arrow B.

Further, the third and fourth speed shift levers 18 are
It is possible to freely switch between 3rd speed (3S) and 4th speed (4S), including neutral N in Fig. 1, centering on 8A, and furthermore, the pin 25 for forward/reverse switching is connected via a relay part 31, lever link 33, etc. These are respectively switched to the forward position F, neutral position N, and reverse position R in Fig. 1, and these are as shown in Figs. 4 and 5.
Specifically, it constitutes a link-type check mechanism 44 that operates in the front-rear direction on the outer surface of the transmission case 7, and in this case, the check fitting 43 has a super deceleration mechanism and an auxiliary transmission mechanism both in H, Moreover, when the main transmission mechanism is in 4th speed, that is, in 4S, the pin 25 is prevented from becoming R.

In addition, in the figure, 45 is a foot cover, and 46 is a foot cover.
indicates a step.

Therefore, the restraint fitting 43 prevents the forward/reverse switching mechanism from going into the reverse position at the above-mentioned time, that is, when the transmission mechanism is in the high speed position, and prevents it from going into the reverse position at other times. Of course, this cannot be prevented.

<Effects of the invention> As detailed above, the present invention is equipped with a means for preventing the transmission mechanism of the traveling system from going into the high-speed position and the forward/reverse switching mechanism from going into the reverse position, so that it is possible to avoid accidental change operations. Therefore, the vehicle does not run backwards at high speed, and there is no risk of an unexpected accident occurring.

Further, the link type operation check mechanism having the above means includes a check plate fixed to the outer elevation of the vehicle body;
A restraining metal fitting that performs restraint via a pin that engages with a restraining elongated hole formed in the upper, middle, and lower parts of the restraining plate, and a restraining lever link is provided on the upper, middle, and lower parts of the restraining metal fitting to hold the vehicle body. Since it is attached so as to operate in the longitudinal direction of the vehicle, it does not protrude significantly from the vertical side of the vehicle body and can be designed compactly, while ensuring reliable operation with few obstacles to getting on and off.

[Brief explanation of drawings]

The drawing shows an example of the invention. Fig. 1 is a side view of the first half of the main part, Fig. 2 is a side view of the second half of the main part, Fig. 3 is a schematic side view of the entire main part, Fig. 4 is a schematic plan view of the entire main part, and Fig. 5 is a side view of the main part. FIG. 4 is a partially enlarged view, FIG. 6 is an overall side view of the tractor, and FIG. 7 is an explanatory diagram of the transmission mechanism. 8... Main transmission mechanism, 9... Forward/forward switching mechanism, 1
0...Sub-transmission mechanism, 11...Super reduction mechanism, 24...
...Check plate, 33...Forward/forward switching check lever link, 34...3rd and 4th speed check lever link,
43... check metal fitting, 44... link type operation check mechanism.

Claims (1)

[Scope of utility model registration request] In a vehicle equipped with a transmission mechanism and a forward/reverse switching mechanism in the running system, a link-type operation restraining mechanism is provided on the outer surface of the vehicle body to prevent the transmission mechanism from moving into a high-speed position and the forward/reverse switching mechanism from moving into a reverse position. The link-type operation restraint mechanism includes a restraint plate fixed to the outer elevation of the vehicle body, and a restraint fitting that performs restraint through pins that engage with restraint slots formed at the top, middle, and bottom of the restraint plate. A high-speed reversing restraint device for a vehicle, characterized in that a restraint lever link is attached above, in the middle, and below the restraint fitting so as to operate in the longitudinal direction of the vehicle body.