JP2593009Y2 - Vehicle mono-lever operating device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a monolever operating device for a vehicle such as a bulldozer, and more particularly, to interfering a plurality of operations such as forward / reverse switching, speed ratio switching, and steering control of a vehicle with each other. TECHNICAL FIELD The present invention relates to a monolever operating device for a vehicle, which aims to improve operability of an operator by enabling operation by a monolever and reduce fatigue.

[0002]

2. Description of the Related Art Conventionally, for shifting and steering operations of a vehicle such as a bulldozer, forward / reverse switching, speed gear switching, and left / right steering operation are performed by switching between three dedicated operating levers as necessary. .

[0003]

However, in the prior art, when switching from left steering to right steering,
Alternatively, it is necessary to change the lever when switching from the steering operation to the speed change operation, and it is difficult to smoothly operate the lever, and there is a drawback that the operator is forced to work to change the lever, thereby leading to operator fatigue.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art. Claim 1 is provided in a driver's cab of a vehicle so as to be swingable in the lateral direction of the vehicle. A first swinging member, a second swinging member installed on a bracket erected on the first swinging member so as to be swingable in the front-rear direction of the vehicle, and a second swinging member mounted on the bracket in the left-right direction of the vehicle. An operating lever is fixed to the third swinging member, and the operating lever is provided with a swinging motion of the third swinging member with respect to the second swinging member. A lock mechanism for fixing is provided, a first control device having an operation position holding mechanism is controlled by swinging the first swing member, and an operation position holding mechanism is swingable by the second swing member. Second
A monolever operating device for a vehicle that controls a control device and controls a third control device having a neutral return mechanism by swinging the third swing member, wherein the eccentricity is a predetermined amount with respect to the swing center of the first swing member. A swing boss pivotally supported by the cab, an input spool operated by the swing of the third swing member, and an output lever operated in accordance with the operation amount of the input spool. A hydraulic servo valve fixed to the first swing member; a third control device operating arm and an intermediate lever fixed to the swing boss;
When the control device is in a neutral state, a connecting rod pivotally attached to a position on the intermediate lever on an extension of a swing center of the first swing member and an output lever of the hydraulic servo valve is provided. age,

According to a second aspect of the present invention, the first control device is a speed gear changeover valve, the second control device is a forward / reverse changeover valve, and the third control device is a steering valve. Controlling a speed-stage switching valve via a speed-stage cable by swinging the first swing member, and controlling a forward-backward switching valve via a forward-backward cable by swinging the second swing member; The steering valve is controlled via an output lever, a connecting rod, an intermediate lever, a swing boss, a steering arm, and a steering cable of a hydraulic servo valve controlled by the swing of the third swing member. Do

[0006]

The above arrangement operates as follows. According to a first aspect of the present invention, the operation lever of the vehicle is fixed in a state where the swing of the third swing member with respect to the second swing member is fixed by a lock mechanism installed on the operation lever fixed to the third swing member. When the first control device is operated by the first swing member while swinging in one of the left and right directions, the first control device is held at the operation position by the operation position holding mechanism of the first control device. Also,
When the operation lever is swung in one of the front and rear directions of the vehicle and the second control device is operated by the second swing member, the operation position is held by the operation position holding mechanism of the second control device. . Subsequently, when the operation lever is swung to the left or right direction of the vehicle in a state where the lock mechanism installed on the operation lever is released, and the third control device is operated by a third swing member, Control according to the operation amount of the third control device is performed at the operation position of the first control device and the operation position of the second control device.

In the neutral position of the third control device,
An intermediate lever fixed to a swing boss pivotally supported by a shaft fixed to the cab and having a swing center eccentric to the swing center of the first swing member by a predetermined amount; and the hydraulic servo valve The pivot point at which the one end is pivotally connected to the other end of the connecting lever is arranged on an extension line of the swing center of the first swing member. Even when the first control device is operated by the first swing member while swinging to one side, the pivot point between the output lever of the hydraulic servo valve and the connecting rod is maintained at the pivot point between the intermediate lever and the connecting rod. Since the swing lever rotates around the swing lever, the swing boss to which the intermediate lever is fixed, and therefore the third control device operation arm, does not swing while being stopped. Therefore, the third control device connected to the third control device operation arm maintains the neutral state.

In a state where the first control device and the second control device are held at the operation positions by the respective operation position holding mechanisms, the third control device is operated to the stroke end by the operation lever, and If the third control device is at the stroke end when the pivot point between the output lever of the hydraulic servo valve and the connecting rod is operated to the upper stroke end, the third control is performed. The intermediate lever cannot rotate any further due to the device operating arm and the swinging boss. for that reason,
The connecting rod pivotally connected to the intermediate lever prevents the pivot point between the output lever of the hydraulic servo valve and the connecting rod from pivoting about the pivot point of the first pivoting member to the vehicle. I do. Therefore, unexpected switching of the first control device due to the operation position holding mechanism of the first control device coming off by the operation force of the operation lever can be prevented.

However, when the pivot point between the output lever of the hydraulic servo valve and the connecting rod is operated up to the end of the downward stroke, the intermediate lever rotates in the neutral direction to thereby connect the output lever of the hydraulic servo valve to the output lever. The pivot point with the connecting rod can pivot about the pivot point of the first pivot member to the vehicle. Therefore, there is a possibility that the operation position holding mechanism of the first control device is disengaged by the operation force of the operation lever and the first control device is switched. When the operating lever is released, the third control device returns to its neutral position.

A second aspect of the present invention is the first aspect according to the first aspect.
The swinging of the swinging member controls the speed-stage switching valve via the speed-stage cable, and the swinging of the second swinging member controls the forward-backward switching valve via the forward-backward moving cable. The input side of the hydraulic servo valve is controlled by the swing, and the steering valve is controlled from the output side of the hydraulic servo valve via a steering cable.

In the neutral position of the steering valve, the steering valve is fixed to a swing boss pivotally supported by the cab and having a swing center decentered by a predetermined amount with respect to the swing center of the first swing member. The pivot point between the intermediate lever and the other end of the connecting rod having one end pivotally connected to the output lever of the hydraulic servo valve is disposed on an extension of the pivot center of the first pivot member. Swings in either the left or right direction of the vehicle,
Even if the speed stage switching valve is operated by the first swing member, the pivot point between the output lever of the hydraulic servo valve and the connecting rod swings around the pivot point between the intermediate lever and the connecting rod. The intermediate lever fixed to the swing boss and the steering arm do not swing while stopped. Therefore, the steering valve connected to the steering arm via the steering cable maintains the neutral state.

Further, in a state where the speed-stage switching valve and the forward / reverse switching valve are held at the operating position by each operating position holding mechanism, the steering lever is operated to the stroke end by the operating lever, and furthermore. When the pivot point between the output lever of the hydraulic servo valve and the connecting rod is operated to the upper stroke end, since the steering valve is at the stroke end, the steering cable, the steering arm The swinging boss prevents the intermediate lever from rotating any further. for that reason,
The connecting rod pivotally connected to the intermediate lever prevents the pivot point between the output lever of the hydraulic servo valve and the connecting rod from pivoting about the pivot point of the first pivoting member to the vehicle. I do.

Accordingly, it is possible to prevent the operation position holding mechanism of the speed stage switching valve from being disengaged by the operating force of the operation lever, thereby preventing unexpected switching of the speed stage switching valve. However, when the pivot point between the output lever of the hydraulic servo valve and the connecting rod is operated to the lower stroke end, the output lever of the hydraulic servo valve and the connecting rod are rotated by rotating the intermediate lever in the neutral direction. Can pivot about the pivot point of the first swing member to the vehicle. Therefore, there is a possibility that the operation position holding mechanism of the speed stage switching valve is disengaged by the operation force of the operation lever and the speed stage switching valve is switched. The steering valve returns to the neutral position when the operation lever is released.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a diagram showing a mounting relationship of a mono lever operating device of a vehicle in a driver's cab and an operation description according to an embodiment of the present invention. FIG. 2 is a diagram showing an operation position of an operating lever according to the embodiment of the present invention. FIG. 3B is a diagram showing the operation lever position during forward / reverse speed change operation in neutral steering, FIG. 3B is a diagram showing the operation lever position during steering operation at each forward / reverse speed stage, and FIG. FIG. 4 is a partial cross-sectional view taken along line AA in FIG. 3, FIG. 5 is a cross-sectional view taken along line CC in FIG. 4, and FIG. 4 is a sectional view taken along line DD in FIG. 4, FIG. 7 is a partial sectional view taken along line BB in FIG. 3, and FIGS. 8 and 9 are mono levers of the vehicle in two speed stages, forward and backward neutral and steering neutral according to the embodiment of the present invention. FIG. 8 is a diagram for explaining the operation device, and FIG. U arrow view, FIG. 9 V arrow view in FIG. 3, FIG. 10 is 1 of the present invention embodiment
FIG. 11 is a view similar to FIG. 9 at the speed stage, and FIG. 11 is a view similar to FIG. 9 at the third speed stage in the embodiment of the present invention.

In FIG. 1, a mono lever operating device 2 for a vehicle according to the present invention is installed in the front of a driver's cab 1 of the vehicle, and a button 3 for steering lock is provided at the tip of the mono lever operating device 2. ing. When the mono lever operating device 2 is operated in the front-rear direction of the vehicle, the forward / reverse switching valves (not shown) respectively move from neutral N to forward F and reverse R
And held in the operating position by the detent of the forward / reverse switching valve. Further, when the mono lever operating device 2 is operated in the left-right direction of the vehicle while the steering operation is locked by pressing the steering lock button 3,
The speed stage switching valve (not shown) is 1
The gear stage is operated in three speed stages in the outward direction, and is maintained at the operated speed stage by the detent of the speed stage switching valve. When the mono-lever operating device 2 is operated in the left-right (L or R) direction of the vehicle with the steering lock released by releasing the steering lock button 3, the forward-reverse switching valve and the speed A steering valve (not shown) is operated in the holding position of the stage switching valve, and the vehicle is steered to the left or right in accordance with the operation amount of the steering valve. When the mono lever operating device 2 is released, the steering valve returns to its steering neutral position and moves straight.

In FIG. 2A, when the mono lever operating device 2 is operated in the front-rear direction of the vehicle, a forward / reverse switching valve (not shown) is operated from neutral to forward or backward, respectively, and the detent of the forward / reverse switching valve causes It is held in the operating position. Also, the steering lock button 3
When the mono lever operating device 2 is operated in the left-right direction of the vehicle in a state where the steering operation is locked by pressing, the mono lever operating device 2 is operated at each forward / reverse speed position (indicated by a black circle) in the steering neutral state. , Held in the operating position by the detent of the speed stage switching valve. That is, the mono-lever operating device 2 has a forward first speed, a forward second speed, a forward third speed,
1 reverse speed, 2 reverse speed, 3 reverse speed, 1 neutral speed, 2 neutral speed,
It will be held in 9 positions of neutral third gear, but neutral 1
The vehicle is stopped at the first, second, and third neutral positions. In the state of (A), when the steering lock is released by releasing the steering lock button 3 and the mono lever operating device 2 is operated in the lateral direction of the vehicle as shown in (B), A steering valve (not shown) is operated, and the vehicle is steered to the left or right in accordance with the operation amount of the steering valve. Further, when the hand is released from the mono-lever operating device 2, the steering valve automatically returns to its steering neutral position. Therefore, the mono-lever operating device 2 has a steering neutral position (●) of each forward / reverse speed stage in (B). Automatically returns to the position.

Next, in the configuration of the embodiment of the present invention, with respect to the switching device between the forward and backward speeds and the speed stage, FIG. 3 schematically shows the entire configuration when the operating lever 12 is in the second speed stage, forward and backward neutral, and steering neutral position. 4 to 7 showing the detailed configuration of the forward / reverse and speed gear switching device. In FIG. 3, reference numerals 4a and 4b denote first left and right brackets fixed to the driver's cab 1; reference numeral 5 denotes a first swing member pivotally supported by the driver's cab 1 by the first brackets 4a and 4b; The second bracket 7a, 7b erected on the first swing member 5 is
A bearing for pivotally supporting the shafts 8a and 8b fixed to the rocking member 9 on the second brackets 6a and 6b, and a third rocking member 11 for the shaft 10 fixed to the second rocking member 9. The operation lever 12 is vertically fixed above the third swing member 11, and the cylinder member 13 is fixed below the third swing member 11. A hydraulic servo valve 14 for steering is fixed below the first swinging member 5, is freely fitted to the cylinder member 13, and is pivotally supported on the first swinging member 5 (see FIG. 4). (Point P in FIG. 2) of the lever member 16 (shown in detail in FIG. 4) is fitted into a hole formed in the spool 15 to operate the spool 15.

As shown in FIG.
A rod 12a is disposed at the center of the rod 2 so as to be slidable in the axial direction, and a button 3 is fixed to an outer end of the rod 12a, and the button 3 slightly projects from the operation lever 12. The rod 12a is urged axially outward by a spring 12c mounted in a case 12b fixed to the grip portion of the operation lever 12, whereby the rod 12a
The inner end is held at a position where it comes out of the rod hole 10a of the shaft 10.

Further, the hydraulic servo valve 14 for steering is provided.
7, a pressure pipe 17 and a drain pipe 18 for servo hydraulic pressure are connected, and an output lever 19 of the hydraulic servo valve 14 for steering is configured to swing around a fulcrum 20. I have. As shown in FIG. 7, a fastening member 25 to which a lever 24 is fixed is fastened to the shaft 8b fixed to the second swinging member 9, and a pin 23 is attached to the lever 24.
, The yoke 22 is pivotally mounted. The yoke 22 is connected to a forward / reverse lever 27 for operating a forward / reverse switching valve via a forward / backward cable 26. The first swing member 5 is connected via a ball joint 28 and a speed stage cable 29 to a speed stage lever 31 for operating a speed stage switching valve.

Next, the structure of the cover of the operation lever 12 will be described with reference to FIG. The operation lever 12 which can be operated in a universal manner, the inner surface fixed to the dashboard 30 of the cab 1 has a spherical outer cover 32, and the outer cover 32 slides while fitting the outer surface to the inner surface. At the same time, an intermediate cover 33 whose inner surface is spherical, an inner cover 34 that slides while fitting its outer surface to the inner surface of the intermediate cover 33, and an outer surface on which the operation lever 12 is fitted at the center thereof are formed. A spherical piece 35 and a bearing 36 slidably contacting the outer surface of the piece 35 and having an outer peripheral surface fixed to the inner cover 34.
A first spring seat 37 whose center is fitted to the rod of the operation lever 12;
And a second spring seat 38 having a spring 39 mounted between the first spring seat 37 and the inner cover 34 via the second spring seat 38 by the spring force of the spring 39. The seal is formed by pressing the inner surface of the cover 33 and the outer surface of the intermediate cover 33 against the inner surface of the outer cover 32.

Next, in the structure of the embodiment of the present invention, the operation device of the steering valve is schematically shown in FIG.
8 and 9 showing the detailed configuration of the steering valve operating device. 3, with respect to the swing center of the first swing member 5 has a swing center O ₂ by a predetermined eccentricity, a swing boss 42 is pivotally supported on the shaft 41 fixed to the first bracket 4a, the The intermediate lever 43 fixed to the swing boss 42 and the output lever 19 of the hydraulic servo valve 14 are connected by a connecting rod 46 having universal joints 6a and 6b at both ends. The swing boss 42
The left and right steering arms 44L and 44R are fixed to the left steering arm 44L, the left steering arm 44L is connected to a left steering lever 45L via a steering cable 21L, and the right steering arm 44R is connected to the steering cable 21R. The right steering lever 45R is connected to the right steering lever 45R. Further, an intermediate lever 43 that is fixed to the swing boss 42, the universal joint 46a having a pivot point Q _N of the connecting rod 46, the first swing center of the swing member 5 when the steering neutral It is arranged on the extension of.

Next, the operation of the above configuration will be described.
FIG. 3 schematically shows an overall configuration of the forward and reverse speed and speed gear switching device according to the embodiment of the present invention, and FIGS. 4 to 7 show detailed configurations of the forward and reverse speed and speed gear switching device. In FIG. 4, since the operation lever 12 is at the neutral position for forward and backward movement, the second swinging member 9 is at the position shown in the figure, and the position of the pin 23 of the yoke 22 is at the point C.
When the second swinging member 9 is operated in the forward direction, the second swinging member 9 rotates counterclockwise, and the pin 23 of the yoke 22 moves to the point F. When the operating lever 12 is operated in the reverse direction from the neutral position, the second swinging member 9 rotates clockwise to rotate the yoke 2.
The position of the second pin 23 moves to the point R. When the position of the pin 23 moves with FCR, the forward and backward moving cable 26 is moved.
The forward / reverse switching valve is switched by operating the forward / reverse lever 27 shown in FIG. 3 through the switch, and is held at the switching position by the detent of the forward / backward switching valve.

Next, when the button 3 is pushed in against the spring force of the spring 12c, the inner end of the rod 12a fits into the rod hole 10a of the shaft 10, so that the third swing member 1
1 cannot swing with respect to the second swing member 9. Therefore, when the operation lever 12 is operated, the third swing member 11
Swings in the left-right direction of the vehicle to switch the speed stage lever 31 shown in FIG. 3 via the ball joint 28 and the speed stage cable 29 to operate the speed stage switching valve, and to detent the speed stage switching valve. Hold in the switching position.

Next, the operation of the steering valve operating device will be described with reference to FIG. 3 showing an outline of the overall configuration of the embodiment of the present invention, and FIGS. 8 and 9 showing the detailed configuration of the steering valve operating device. I do. FIGS. 8 and 9 show a state in which the gear is switched to the second speed stage and the hydraulic steering servo valve 14 is in the vertical direction.
When you release the button that pressed button 3 that was fixed to 2,
As shown in FIG. 4, the rod 12 is moved by the spring force of the spring 12c.
a of the third rocking member 11 by operating the operation lever 12 because the inner end of the shaft 10a comes out of the rod hole 10a of the shaft 10.
Swings right and left of the vehicle. Therefore, a steering hydraulic servo valve is provided by a lever member 16 which rotates around a fulcrum P provided on the first swing member 5 via a cylinder member 13 fixed to the third swing member 11. By operating the spool 15 of the hydraulic servo valve 14,
Output lever 19, connecting rod 46, intermediate lever 43,
By operating the left and right steering levers 45L and 45R via the swing boss 42 and the steering arms 44L and 44R, 2
The steering operation at the speed stage can be performed. In this manner, the steering according to the operation amount of the operation lever 12 is performed at the operation position of the speed stage switching valve and the operation position of the forward / reverse switching valve.

At the neutral position of the steering valve in the steering operation, the steering valve is pivotally supported by the cab 1 having a swing center O ₂ eccentric by a predetermined amount with respect to the swing center of the first swing member 5. an intermediate lever 43 that is fixed to the shaft 41 to swing boss 42 which is pivotally supported with the hydraulic coupling has one end thereof to the output lever 19 of the servo valve 14 pivotally mounted by a universal joint 46b of the pivot points P _N rod 46 to pivotally by the second end and a universal joint 46a of the pivot point Q _N. Pivot point Q of the universal joint 46a
_{Since the N} position is arranged on the extension line of the center of the swing of the first swing member 5, the operation lever 12 swings in one of the left and right directions of the vehicle, and the first swing member 5 sets the speed stage. be operated switching valve, since pivot point P _N and the output lever 19 and the connecting rod 46 of the hydraulic servo valve 14 which swings the pivot point Q _N around the connecting rod 46 and the intermediate lever 43 , The intermediate lever 4 fixed to the swing boss 42
3. The swinging boss 42 and the steering arms 44L, 44R are all still stopped and do not swing. Therefore, the steering arms 44L, 4
The steering valve connected to 4R via the cables 21L and 21R maintains the neutral state.

Further, in a state where the speed stage switching valve and the forward / reverse switching valve are held at the operating position by each detent, the steering lever is operated to the stroke end by the operating lever 12, and furthermore, When trying to operate, the output lever 1 of the hydraulic servo valve 14 is
9 and coupling when the pivot point P _N of the rod 46 is operated to the upper stroke end P _R is the steering valve is also steering cables because that is the stroke end 21L, 21
R, the intermediate lever 43 steering arm 44L, 44R, the oscillating boss 42 can not rotate more than Q _R. For this purpose, the pivot point P _R between the output lever 19 of the hydraulic servo valve 14 and the connecting rod 46 is set by the connecting rod 46 pivotally connected to the intermediate lever 43.
Swinging about the pivot point of the vehicle to the vehicle is prevented. Therefore, even if the steering valve is operated to the stroke end by the operation lever 12 and further operated, the detent of the speed stage switching valve is deviated by the operating force of the operation lever 12 and the unexpected switching of the speed stage switching valve is performed. Switching can be prevented.

[0027] However, when said pivot point P _N and the output lever 19 and the connecting rod 46 of the hydraulic servo valve 14 is operated to lower stroke end P _L, the intermediate lever 46
Is rotated in the neutral direction, whereby the pivot point P _L between the output lever 19 of the hydraulic servo valve 14 and the connecting rod 46 pivots about the pivot point of the first pivot member 5 to the vehicle. Can be. Accordingly, there is a possibility that the detent of the speed stage switching valve is released by the operating force of the operation lever 12 and the speed stage switching valve is switched. The steering valve returns to the neutral position when the operation lever is released.

FIG. 10 is a view in which the speed stage is switched to the first speed, and the steering hydraulic servo valve 14 shown in FIG. 9 swings counterclockwise from the vertically oriented state. The steering operation is the same as in FIG. 9 and will not be described. FIG. 11 shows that the speed stage is switched to the third speed, and FIG.
FIG. 10 is a diagram in which the steering hydraulic servo valve 14 is swung clockwise from a state where the steering hydraulic servo valve 14 is oriented vertically. The steering operation at the third speed stage is the same as that in FIG.

[0029]

According to the present invention, as described in detail above, the following effects can be obtained. (1) The operability of the operator can be improved and fatigue can be reduced by enabling a plurality of operations such as forward / reverse switching, speed ratio switching, and steering operation of the vehicle to be operated by a mono lever. (2) In the neutral position of the steering valve, a swing boss pivotally supported by a shaft fixed to the driver's cab and having a swing center eccentric with respect to the swing center of the first swing member 5 by a predetermined amount. The pivot point between the fixed intermediate lever and the other end of the connecting rod, one end of which is pivotally supported by the output lever of the hydraulic servo valve, is arranged on an extension of the swing center of the first swing member. (3) The first control device can be operated while the control device is kept in the neutral state. As described above, by reducing the size of the monolever operating device capable of operating a plurality of operations without interfering with other operations, the cab can be widely used. (3) Even if the third control device is operated to the stroke end by the operation lever and the pivot point between the output lever of the hydraulic servo valve and the connecting rod is operated to the upper stroke end even if the third control device is further operated, the hydraulic servo In order to prevent the pivot point between the output lever of the valve and the connecting rod from pivoting around the pivot point of the first pivoting member to the vehicle, the operating position of the first control device is maintained by the operating force of the operating lever. It is possible to prevent unexpected switching of the first control device due to disengagement of the mechanism.

[Brief description of the drawings]

FIG. 1 is a diagram showing a mounting relationship of a mono lever operating device of a vehicle in a driver's cab and an operation description according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams showing the operation lever position in the embodiment of the present invention, in which FIG. 2A shows the operation lever position at the time of forward / reverse shift operation in neutral steering, and FIG. FIG. 4 is a diagram illustrating an operation lever position during operation.

FIG. 3 is an external perspective view schematically showing the mono lever operating device of the vehicle according to the embodiment of the present invention at two speeds, forward and backward neutral, and steering neutral.

FIG. 4 is a partial cross-sectional view along AA in FIG. 3;

FIG. 5 is a sectional view taken along line BB in FIG. 4;

FIG. 6 is a sectional view taken along the line CC in FIG. 4;

FIG. 7 is a partial sectional view taken along the line DD in FIG. 3;

FIG. 8 is a view for explaining the mono lever operating device of the vehicle in the second speed stage, forward and backward neutral, and steering neutral according to the embodiment of the present invention, and is a view as viewed from the arrow U in FIG. 3;

9 is a view for explaining the mono lever operating device of the vehicle in the second speed stage, forward and backward neutral, and steering neutral according to the embodiment of the present invention, and is a view taken in the direction of arrow V in FIG. 3;

FIG. 10 is a view similar to FIG. 9 at one speed stage of the embodiment of the present invention;

FIG. 11 is a view similar to FIG. 9 at the third speed stage of the embodiment of the present invention;

[Explanation of symbols]

 Reference Signs List 1 cab 2 mono lever operating device 3 button 4a, 4b first bracket 5 first swing member 6a, 6b second bracket 7a, 7b bearing 8a, 8b shaft 9 second swing member 10 shaft 11 third swing member 12 Operating lever 13 Cylinder member 14 Hydraulic servo valve 15 Spool 16 Lever member 17 Pressure pipe 18 Drain pipe 19 Output lever 20 Support point 21L, 21R Steering cable 22 Yoke 23 Pin 24 Lever 25 Fastening bracket 26 Forward-reverse cable 27 Forward-reverse lever 28 Free Joint 29 Speed stage cable 30 Dashboard 31 Speed stage lever 32 Outer cover 33 Intermediate cover 34 Inner cover 35 Piece 36 Bearing 37 First spring 38 Second spring 39 Spring 41 Shaft 42 Swing boss 43 Intermediate lever 44L, 44R Steering arm 45L, 45R steering Bar 46 connecting rod 46a, 46b universal joint

Claims (2)

(57) [Scope of request for utility model registration] 1. A first swing member installed in a driver's cab of a vehicle so as to be swingable in the left-right direction of the vehicle, and a bracket erected on the first swing member is swingable in a front-rear direction of the vehicle. And a third swing member mounted on the second swing member so as to be swingable in the left-right direction of the vehicle. An operation lever is fixed to the third swing member. The operation lever is provided with a lock mechanism for fixing the swing of the third swing member with respect to the second swing member, and a first mechanism having an operation position holding mechanism by the swing of the first swing member. Controlling the control device, controlling the second control device having the operation position holding mechanism by the swing of the second swing member, and controlling the third control device having the neutral return mechanism by the swing of the third swing member. In the monolever operating device for a vehicle to be controlled, a predetermined amount is set with respect to a swing center of the first swing member. An oscillating boss having an eccentric oscillating center, pivotally supported by the driver's cab, an input spool operated by oscillating the third oscillating member, and an output operated according to an operation amount of the input spool. A lever;
A hydraulic servo valve fixed to a swing member, a third control device operation arm and an intermediate lever are fixed to the swing boss, and when the third control device is neutral, the first swing member swings. A mono-lever operating device for a vehicle, comprising: a connecting rod pivotally connected to a position on the intermediate lever on an extension of a moving center and an output lever of the hydraulic servo valve. 2. The vehicle speed change steering apparatus according to claim 1, wherein the first control device is a speed gear switching valve, the second control device is a forward / reverse switching valve, and the third control device is a steering valve. (1) The swinging of the swing member controls a speed-stage switching valve via a speed-stage cable, and the swinging of the second swinging member controls the forward-backward switching valve via a forward-backward cable. The steering valve is controlled via an output lever, a connecting rod, an intermediate lever, a swing boss, a steering arm, and a steering cable of a hydraulic servo valve controlled by the swing of the moving member. 2. The mono lever operating device for a vehicle according to claim 1.