JPH09249150A - Steering device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the correction of linear position in a steering wheel by providing a rod length adjusting mechanism on at least one of right and left connection rods, and interposing remote control means between the mechanism and operation part. SOLUTION: Ports 32, 33 on the head sides of a follower hydraulic cylinder 28 and a hydraulic cylinder 31 are connected to each other while ports 34, 35 on the rod sides are connected to each other. A threaded rod 36 is threadably inserted into a female thread formed on the rod of the cylinder 31 and a dial 37 is fixed as a terminal RT on the operation side of remote control means R to an outer end of the rod 36. Through the turning operation of the dial 37, the cylinders 31, 28 are driven to extend and shrink to thereby change the rod length of right connection pipe 24K, and accordingly the linear moving state of vehicle and the linear position of steering wheel 9 are made to correspond with each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle steering system.

[0002]

2. Description of the Related Art Conventionally, the left and right running parts are interlocked with left and right hydrostatic transmissions, and the gear shift operation shafts of the above transmissions are interlocked with stearin wheels via a connecting rod and an operation transmission mechanism. There is a vehicle that is connected and can be steered by operating the steering wheel, and the straight traveling position of the steering wheel and the straight traveling state of the vehicle may not match due to the left-right misalignment of the operation transmission mechanism. A turnbuckle is provided on one side of the turnbuckle to adjust the expansion and contraction of the turnbuckle to correct the above mismatch.

[0003]

However, when the vehicle is in use, the left and right of the operation transmission mechanism may be inconsistent, or the wear of tires and crawlers may be inconsistent. The condition did not match, and in order to correct this, it required a troublesome readjustment of the turnbuckle.

[0004]

Therefore, in the present invention, the left and right traveling parts are configured to be driven via the left and right hydrostatic transmissions that are interlocked with the engine, and the steering wheel provided in the operation part is used as an operation transmission mechanism. The left and right shifting operation drive shaft of the operation transmission mechanism and the left and right shifting operation receiving portion of the left and right hydrostatic transmission are interlockingly connected through the left and right connecting rods, respectively, and the steering wheel is rotated. In a vehicle configured to steer the traveling direction of the vehicle, a rod length adjusting mechanism is provided on at least one of the left and right connecting rods,
A remote control means is provided between the rod length adjusting mechanism and the driving section so that the rod length adjusting mechanism can be operated by operating a terminal on the driving section side of the remote controlling means. Is intended to be provided.

[0005] The present invention also has the following features.

The rod length adjusting mechanism includes a passive hydraulic cylinder which is expandable and contractible in the middle of the connecting rod, and the passive hydraulic cylinder is connected to a driving hydraulic cylinder provided in a driving section so as to drive the passive hydraulic cylinder. Expand and contract in conjunction with the expansion and contraction operation of the hydraulic cylinder.

In the rod length adjusting mechanism, a turnbuckle driven by a geared motor is provided in the middle of the connecting rod, and the geared motor is connected to a telescopic switch installed in a driving section.
The extension switch is operated to rotate the geared motor forward and backward to change the rod length of the connecting rod.

In the rod length adjusting mechanism, the connecting rod is the first,
Divided into second connecting rods, the inner ends of the first and second connecting rods were respectively connected to the opposite vertices of the four-side link mechanism, and to the other opposite vertices of the same four-side link mechanism. Between the nuts, bolts with screws formed in opposite directions at both ends are screwed together, and the bolts are interlockingly connected to a knob provided in the operating unit via a wire capable of transmitting torque, and by turning the knob. It is configured to change the rod length of the connecting rod.

A display unit showing an operation direction for correcting the straight-ahead position of the steering wheel is provided on the driving unit side terminal of the remote control means.

[0010]

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, A is an agricultural tractor equipped with a vehicle steering apparatus according to the present invention, and a rotary cultivator B as a working machine is connected to the rear part thereof.

The agricultural tractor A has a pair of right and left crawler type traveling parts 2L and 2R mounted on the left and right sides of the vehicle body frame 1, and receives power from a prime mover portion 3 arranged at the front part of the vehicle body frame 1. The agricultural tractor A is transmitted by being transmitted to the left and right traveling portions 2L, 2R.

On the rear side of the prime mover section 3, a driving section 5 covered with a cabin 4 is placed. The driving section 5 has an operating section 6 and a driving seat 7 on the front and rear portions of the cabin 4, respectively. The left and right hydrostatic transmissions 10L and 10R, which will be described later, are provided by the gearshift lever 8 and the steering wheel 9 provided on the operating portion 6.
Of the left and right hydraulic motors ML and MR by changing the inclination angles of the left and right swash plates SL and SR to simultaneously increase and decrease the speed ratio of the left and right hydrostatic transmissions 10L and 10R to move the agricultural tractor A forward and backward. The agricultural tractor A can be steered by speeding up / down or changing the gear ratio of the left and right hydrostatic transmissions 10L and 10R.

FIG. 2 shows the left and right hydrostatic transmissions 10L and 10R arranged in the prime mover section 3. The left and right hydrostatic transmissions 10L and 10R are the variable displacement left and right hydraulic pumps for the engine E. PL and PR are linked together, and fixed displacement left and right hydraulic motors ML and MR are connected to the left and right hydraulic pumps PL and PR, respectively, to adjust the tilt angles of the left and right swash plates SL and SR of the left and right hydraulic pumps PL and PR. By changing it to change the discharge amount, the gear ratios of the left and right hydrostatic transmissions 10L and 10R can be individually changed.

The operation unit 6 is, as shown in FIGS. 3 and 4,
A steering column 11 is erected on the floor of the cabin 4, and a gearshift lever 8 is attached to the stearin column 11 and
A circular steering wheel 9 is attached to the upper end of a steering shaft 12 that rotatably passes through the steering column 11.
Is installed.

The lower end of the steering shaft 12 is interposed between the operating portion 6 and the left and right hydrostatic transmissions 10L and 10R so that the steering wheel 9 and the shift lever 8 can be operated by the left and right hydrostatic transmissions 10L and 10R. Operation transmission mechanism M that transmits to 10R
The left and right shifting operation drive shafts 20L and 20R that are interlockingly connected to the upper surface of the left and right sides of the operation transmission mechanism M and the left and right shifting operation receiving portions 21L and 21R of the left and right hydrostatic transmissions 10L and 10R. Are linked and linked via left and right link mechanisms 22L and 22R, respectively, and by operating the speed change lever 8, the left and right hydrostatic transmissions 10L and 10R are accelerated and decelerated at the same speed ratio from forward to reverse, and steering is performed. By rotating the wheel 9, the gear ratios of the left and right hydrostatic transmissions 10L and 10R can be made different from each other.

The left and right link mechanisms 22L and 22R are shown in FIGS.
As shown in, the tip of the left / right operation drive arms 23L, 23R fixed to the left / right shift operation drive shafts 20L, 20R is connected to the left / right connecting rods.
The front ends of 24L and 24R are rotatably pivoted, and the left and right connecting rods 24L and 24R are connected.
The rear end of the 24R is pivotally attached to one end of the left and right bell cranks 26L, 26R pivotally attached to the left and right intermediate shafts 25L, 25R, respectively, and the other ends of the left and right bell cranks 26L, 26R are respectively linked to the left and right interlocking rods.
The gear shift operation receiving shafts 21L and 21R are interlocked and coupled via 27L and 27R.

Particularly, in the present invention, the left and right connecting rods 24L, 24
It is possible to provide a rod length adjusting mechanism L on at least one of Rs so that the rod length adjusting mechanism L can be operated from the driving unit 5 so that the straight traveling position of the steering wheel 9 and the straight traveling state of the agricultural tractor A coincide with each other. So that you can
Hereinafter, examples of the present invention will be described.

FIG. 4 shows the rod length adjusting mechanism L1 of the first embodiment.
The rod length adjusting mechanism L1 is the right connecting rod 24R.
Is composed of a first connecting rod 29 connected to the head of a telescopic passive hydraulic cylinder 28 and a second connecting rod 30 connected to a rod of the passive hydraulic cylinder 28. Is connected to the driving hydraulic cylinder 31 provided via the remote control means R.

That is, the head side ports 32 and 33 and the rod side ports 34 and 35 of the passive hydraulic cylinder 28 and the driving hydraulic cylinder 31 are connected to each other, and a female screw is formed on the rod of the driving hydraulic cylinder 31. The screw rod 36 is slidably inserted into the screw rod 36, and the dial 37 serving as the driving unit side terminal RT of the remote control means R is fixed to the outer end of the screw rod 36.

With this construction, when the agricultural tractor A is not in the straight traveling state and the steering wheel 9 is in the straight traveling position, the driving hydraulic cylinder 31 is expanded and contracted by the turning operation of the dial 37. By extending / contracting the passive hydraulic cylinder 28, the rod length of the right connecting rod 24R can be changed so that the straight traveling state and the straight traveling position match.

FIG. 5 shows a display section H formed on the dial 37 as the driving section side terminal RT of the remote control means R, and right and left crawlers 38L, 38R are schematically shown in front of the dial 37.
The left and right arrows 39L and 39R indicate the turning direction of the dial 37 for correcting the straight traveling position of the steering wheel 9.

FIG. 6 shows a rod length adjusting mechanism L2 of the second embodiment.
The rod length adjusting mechanism L2 divides the right connecting rod 24R into the first and second connecting rods 29 and 30, and forms the turnbuckle 40 in the middle of the first connecting rod 29 to form the first connecting rod. The inner end of 29 is linked to the output shaft 42 of the geared motor 41 attached to the inner end of the second connecting rod 30, and the geared motor 41 is installed in the operating unit 5 via the wiring as the remote control means R. The remote control means R is connected to a telescopic switch 43 as a terminal RT on the driving section side, and the operation of the telescopic switch 43 rotates the geared motor 41 in the forward and reverse directions to change the rod length of the right connecting rod 24R.

FIG. 7 is a front view of the telescopic switch 43 as the terminal RT on the driving section side. The telescopic switch 43 is composed of left and right switches 43L and 43R, and the left and right switches 43L and 43R are respectively left and right crawlers 2L and 2R. Left and right arrow 39L, which indicates the correction direction,
39R is displayed schematically.

FIG. 8 shows a rod length adjusting mechanism L3 of the third embodiment.
And the right connecting rod 24R is connected to the first and second connecting rods 29, 30.
The four side link mechanism 50 is provided between the first and second connecting rods 29, 30, and the opposite vertices of the four side link mechanism 50 are connected to the first and second connecting rods 29, 30, respectively. Attach nuts 51 and 51 that are pivotally attached to the inner end and that form threads in opposite directions at the other vertices.
Screw the bolts 52 that are respectively screwed into 51, 51, and
The rod 52 of the right connecting rod 24R is changed through the four-side link mechanism 50 by interlocking the 52 and the knob 53 provided in the operating unit 5 with the wire 54 capable of transmitting the torque, and rotating the knob 53. I am trying.

9 and 10 show an engine protector 60 disposed below the engine E. The engine protector 60 has left and right side plates 61, 6 inclined obliquely inward and downward.
2, the substantially horizontal bottom plate 63, and the front plate 64 of front high rear low,
It is formed in the shape of a box with a rear opening, and especially the front plate 64
The lower end of the front plate 64 is bent rearward to form a predetermined gap 65 between the lower end of the front plate 64 and the upper surface of the bottom plate 63 to improve the ventilation to the lower surface of the engine E and promote cooling. With
Cooling air from the front can be rectified and blown to the rear to accelerate cooling of the transmission and the like arranged behind the engine E. In addition, it is possible to easily discharge the earth and sand that have entered the inside of the engine protector 60 during traveling in a wetland, and to prevent the cooling effect from deteriorating.

[0027]

According to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the left and right traveling parts are configured to be driven through the left and right hydrostatic transmission connected to the engine, and the steering wheel provided in the operating part is connected to the operation transmission mechanism. The left and right shifting operation drive shaft of the operation transmission mechanism and the left and right shifting operation receiving portion of the left and right hydrostatic transmission are interlockingly connected through the left and right connecting rods, and the vehicle is advanced by turning the steering wheel. In a vehicle configured to steer in a direction, a rod length adjusting mechanism is provided on at least one of the left and right connecting rods, and a remote operating means is provided between the rod length adjusting mechanism and the driving section to provide a remote operating means. Since the rod length adjustment mechanism can be operated by operating the terminal on the driving unit side, the rod of the connecting rod that connects the operation transmission mechanism and the left and right hydrostatic transmissions by the operation from the driving unit. It is possible to match the straight-ahead position of the steering wheel to the straight traveling state of the vehicle by changing the.

As described above, since the straight traveling position of the steering wheel can be easily corrected from the driving section, the deviation of the straight traveling position due to the lateral wear of the crawler and other causes is corrected at any time to control the steering of the vehicle. The operation can be facilitated.

According to a second aspect of the present invention, the rod length adjusting mechanism includes a passive hydraulic cylinder that is expandable and contractable in the middle of the connecting rod, and the passive hydraulic cylinder is connected to a driving hydraulic cylinder provided in a driving section. Then, by expanding and contracting the passive hydraulic cylinder in conjunction with the expansion and contraction operation of the driving hydraulic cylinder, the structure of the remote operation means between the rod length adjusting mechanism and the operation section side terminal of the remote operation means is simplified, and moreover, The operation of the driving unit side terminal can be reliably transmitted to the rod length adjusting mechanism.

According to a third aspect of the present invention, the rod length adjusting mechanism is provided with a turnbuckle driven by a geared motor in the middle of the connecting rod, and the geared motor is connected to an expansion / contraction switch installed in a driving part to expand / contract the same. By operating the switch to rotate the geared motor in the forward and reverse directions to change the rod length of the connecting rod, the rod length can be changed to the straight-ahead position of the steering wheel by an operation that does not require a simple force to push the switch. Can be modified.

According to a fourth aspect of the present invention, in the rod length adjusting mechanism, the connecting rod is divided into a first connecting rod and a second connecting rod.
The inner ends of the second connecting rods are respectively connected to the opposite vertices of the four-side link mechanism, and between the nuts connected to the other opposite vertices of the same four-side link mechanism, in opposite directions to both ends. A bolt formed with a screw is screwed on, and the bolt is configured to be interlocked with a knob provided in the operation unit via a wire capable of transmitting torque, and the rod length of the connecting rod is changed by rotating the knob. By doing so, the remote control means can be mechanically constructed to reduce the cost.

In the invention according to claim 5, the display unit for indicating the operation direction for correcting the straight-ahead position of the steering wheel is provided on the driving unit side terminal of the remote control means, so that the erroneous operation of the correction is prevented. Thus, it is possible to surely correct the straight traveling position.

[Brief description of drawings]

FIG. 1 is a side view of an agricultural tractor including a vehicle steering system according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a hydrostatic transmission.

FIG. 3 is a side view of an operation unit.

FIG. 4 is a plan view of the operation unit (first embodiment).

FIG. 5 is a front view of the driving unit side terminal of the remote control means (first embodiment).

FIG. 6 is a side view of a connecting rod (second embodiment).

FIG. 7 is a front view of a driving unit side terminal of the remote control means (second embodiment).

FIG. 8 is a side view of a connecting rod (third embodiment).

FIG. 9 is a front view of an engine protector.

FIG. 10 is a sectional side view of the engine protector.

[Explanation of symbols]

 E Engine H Display L Rod length adjustment mechanism M Operation transmission mechanism R Remote control means RT Driving side terminal 2L, 2R Left and right running section 5 Driving section 9 Steering wheel 10L, 10R Left and right hydrostatic transmission 20L, 20R Left and right shifting operation Driving shaft 21L, 21R Left and right shifting operation receiving portion 24L, 24R Left and right connecting rod 28 Passive hydraulic cylinder 29 First connecting rod 30 Second connecting rod 31 Driving hydraulic cylinder 41 Geared motor 40 Turnbuckle 43 Expansion switch 50 Four side link mechanism 51 Nut 52 Bolt 54 Wire 53 Knob

Claims (5)

[Claims] 1. The left and right traveling parts (2L) and (2R) are configured to be driven via left and right hydrostatic transmissions (10L) and (10R) interlockingly connected to an engine (E), and a driving part (5) is provided. The provided steering wheel (9) is linked to the operation transmission mechanism (M), and the left and right shifting drive shafts (20L) (20R) and left and right hydrostatic transmissions (10L) (10R) of the operation transmission mechanism (M) are linked. ) The left and right gear shift operation receiving portions (21L) and (21R) are interlockingly connected through the left and right connecting rods (24L) and (24R), respectively, and the steering wheel (9) is rotated to change the traveling direction of the vehicle. In a vehicle configured to steer, a rod length adjustment mechanism (L) is provided on at least one of the left and right connecting rods (24L) (24R),
(5) The remote control means (R) is installed between it and the rod length adjustment mechanism by operating the operation side terminal of the remote control means (R).
A steering device for a vehicle characterized in that (L) can be operated. 2. The rod length adjusting mechanism (L) is provided with a passive hydraulic cylinder (28) which is expandable and contractible in the middle of the connecting rod, and the passive hydraulic cylinder (28) is provided in the operating section (5). 2. The steering apparatus for a vehicle according to claim 1, wherein the passive hydraulic cylinder (28) is connected to the driving hydraulic cylinder (31) so as to communicate with the driving hydraulic cylinder (31) so as to expand and contract in association with the expansion and contraction operation of the driving hydraulic cylinder (31). 3. The rod length adjusting mechanism (L) comprises a turnbuckle (4) driven by a geared motor (41) in the middle of the connecting rod.
(0), connect the geared motor (41) to the telescopic switch (43) installed in the operating unit (5), and operate the telescopic switch (43) to rotate the geared motor (41) forward and reverse to connect. The rod rod of the rod is configured to be changed, and the rod length is changed.
A steering device for the vehicle described. 4. The rod length adjusting mechanism (L) divides the connecting rod into first and second connecting rods (29) and (30), and divides the connecting rod into first and second connecting rods.
(29) The inner ends of (30) are respectively connected to one of the opposite apexes of the four-sided link mechanism (50), and the four-sided link mechanism (5
Nuts (51) connected to the other opposite vertices of (0)
A knob (52) with screws opposite to each other formed between the (51) and the bolt (52) is attached to the driving section (5) via the wire 54 capable of transmitting torque. The steering apparatus for a vehicle according to claim 1, wherein the steering system is linked to the (53) and the rod length of the connecting rod is changed by rotating the knob (53). 5. A driving unit side terminal (R) of the remote control means (R)
2. The steering apparatus for a vehicle according to claim 1, further comprising a display unit (H) provided at T) for indicating an operation direction for correcting the straight traveling position of the steering wheel (9).