JPH0627466Y2 - Safety device for vehicles with steering wheel speed increasing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a safety device for a vehicle with a steering wheel speed increasing device.

(B) Conventional technology Conventionally, for example, in a four-wheel drive vehicle such as an agricultural tractor, while turning, the steered wheels (front wheels) have a longer path length than the rear wheels due to an inner wheel difference, etc. Since it is driven at high speed, it has a drawback that it is difficult to make a sharp turn. When the steering wheel is steered by a large amount, the speed ratio switching mechanism operates to switch the speed increasing device to the speed increasing operation side, thereby eliminating the difficulty of sharp turning due to the difference in the path length. ing.

(C) Problems to be solved by the invention However, the speed ratio switching device is interlocked with the steering wheel, and even when the working machine for work is mounted on the vehicle and the center of gravity is high, the steering wheel is When the steering wheel is steered to a large extent, the steered wheel speed increasing device is switched to the speed increasing operation state to make a sharp turn, and there is a drawback in that there is a risk of overturning the body.

(D) Means for Solving Problems The present invention provides a steering wheel speed increasing device that can drive front and rear wheels and that can switch the speed ratio between the final drive device for the front wheels and the front propeller shaft. It is possible to switch the steering wheel speed increasing device from a constant speed operating state to a speed increasing operating state by means of a speed ratio switching mechanism interlockingly connected to a steering wheel. A switching lever for manually switching the device between a constant-speed operating state and a speed-up operating state is interlockedly connected, and a detection mechanism for detecting whether or not an instrument is mounted is provided on the working machine mounting portion of the vehicle. Is a safety device for a vehicle equipped with a traveling wheel speed increasing device that interlocks the operation of detecting the mounting of the implement by the detection mechanism with the operation of switching the steering wheel speed increasing device to the constant speed operation state by the switching lever. Check The eject mechanism pivotally attaches the detection lever to the mounting plate to which the mounting pin of the implement is attached, and the detection lever is extended in a direction substantially orthogonal to the mounting direction of the mounting pin. A detection unit that abuts and rotates, and a transmission unit that rotates in conjunction with the rotation operation of the detection unit are provided. One end of the wire is connected to the transmission unit, and the switching lever is connected to the other wire. An object of the present invention is to provide a safety device for a vehicle with a traveling wheel speed increasing device characterized by connecting ends.

(E) Action / effect When the work implement is mounted on the vehicle, the detection mechanism forcibly keeps the constant-speed operation state of the steered wheel speed increasing device to prevent sudden turning of the machine and ensure safety. can do.

At this time, the detection lever of the detection mechanism is rotatably pivotally attached to a mounting plate on which the mounting pin of the implement is mounted, and the detection lever is extended in a direction substantially orthogonal to the mounting direction of the mounting pin, A detection unit that rotates by contact with the mounting pin and a transmission unit that rotates in conjunction with the rotation operation of the detection unit are provided.
Since the transmission part and the switching lever are directly connected by a wire and the switching lever is switched in conjunction with the pulling operation of the wire, the switching lever is surely switched when the instrument is attached. Thus, the steering wheel speed increasing device can be forcibly switched from the speed increasing operating state to the constant speed operating state to maintain the equivalent speed operating state.

Especially when a front-mounted work machine is connected, the center of gravity becomes high, and the machine body tends to lean left and right when the machine is turning.However, in the present invention, when the work machine is mounted, the steering wheel speed increasing device automatically operates. It becomes a constant speed operation state, and sudden turning is prevented, and safety is maintained.

(F) Embodiment An embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 7, (A) shows a four-wheel drive tractor, which is powered by an engine section (1) provided at the front of the machine body. , The clutch housing (2) and the transmission case (3) to drive the left and right rear wheels (4) arranged on the left and right sides of the same case (3) to extend the front propeller extending in front of the transmission case (3). shaft
(5), left and right front wheels via final drive device (6)
The steering wheel (8) provided behind the engine unit (1) is used to drive the (7) and steer the left and right front wheels (7).

A differential device for distributing power to the front and rear wheels, a so-called center differential, is not equipped with emphasis on straightness during work traveling.

Further, bevel gears (9a) (9b) (9c) (9d) were used between the front propeller shaft (5) and the final drive device (6) of the front wheels (7) as shown in FIG. The steering wheel speed increasing device (9) of the differential type that can switch the speed ratio is installed, and the bevel gear (9d) is connected to the dog clutch (10) by the front propeller shaft (5).
By connecting the bevel gear (9a) connected to the final drive device (6) by connecting to the input shaft (11) connected to the front propeller shaft (5), the power is transmitted at a rotation speed equal to that of the front propeller shaft (5). The bevel gear (9d) is a wet multi-plate type brake (12).
Then, by fixing it to the case (13) of the speed increasing device (9),
Power is transmitted to the final drive device (6) at the double rotation speed via the bevel gear (9a).

The speed ratio switching operation is performed by forming one tooth (10a) of the dog clutch (10) at one end of the slider (14) fitted on the input shaft (10) and the brake (12) at the other end. The pressure plate (12a) is formed and the slider (14) is moved by the operation of the shift fork (15a) fixed to the shift shaft (15) through which the case (13) is inserted.

In the figure, (16) indicates a return spring for urging the slider (14) toward the dog clutch (10) to maintain a constant speed operation state.

A switching lever (17) is fixed to the end of the shift shaft (15) protruding outside the case (13) as shown in FIGS. 3 and 4, and the tip of the lever (17) is fixed. The push rod (2) of the speed ratio switching mechanism (19) is attached to the joint metal fitting (18) that is pivotally attached.
(0) is slidably inserted, and the shift shaft (15) is rotated by pushing the spring (25) in the buffer mechanism (24) provided in the middle of the rod (20). I have to.

At the base end of the push rod (20), a cam plate (2
3) is fixed, and the pitman arm (21a) of the steering gear box (21) is in the recess (23a) formed in the plate (23).
The intermediate shaft (22) that is interlocked with is inserted through the cam plate.
Set the upper and lower cam surfaces (23b) and (23c) of (23) to the steering wheel.
When (8) is set to a large rudder angle, the upper and lower cam rollers (29a) and (29b) are supported coaxially with the intermediate shaft (22) at a predetermined interval.
Is pushed by the rotation of the intermediate shaft (22), and the push rod
Press (20) to activate.

Further, the upper and lower cam rollers (29a) (29b) are roller support plates (31) protruding from the pipe shaft (30) spline-fitted to the intermediate shaft (22).
The shaft (30) is axially supported by the wire rod (32) connected to the switching lever (49), and slides it in the axial direction through the lever (43) to form the upper and lower cam rollers (29a) (29b). Upper and lower cam surfaces (23a) (23
By operating the contact state with b), the speed-up operation and the constant-speed operation of the steered wheels are switched.

In the figure, (33) is the pitman arm (21a) and the intermediate shaft (22).
An intermediate link connecting the and, (34) is a drag rod, and (35) is a return spring of the tube axis (30).

In addition, the tractor (A) has a work implement (B) as shown in FIG.
The work implement (B) is a front-mounted loader, and the work implement mounting part provided on the tractor (A).
Attach the mounting column (51) to the upper surface of (50) in an upright state, and
The boom (52) whose base end is pivotally attached to (51) and the bucket (53) which is pivotally attached to the end of the boom (52) are respectively rotated by hydraulic cylinders (54) and (55) to accumulate soil and sand. The work machine mounting part (50) is provided with a mounting plate (57) having an approximately U-shaped fitting groove (56) formed on the upper surface of the work machine mounting part (50). ) Mounting pin provided on the lower end of the mounting column (51)
(58) is fitted in the groove (56), the mounting pin (58) is fixed by the lock pin (59), and the working machine (B) is mounted and fixed to the tractor (A). In addition, (60) is a lock pin (59)
The lever for operation is shown.

The detection mechanism (N) that detects whether or not the work machine (B) is attached is the first
As shown in the figure, it is provided on the mounting plate (57) and is approximately L
The detection lever (61) of the character shape is pivotally attached to the mounting plate (57) so that the detection portion (62) of the lever (61) faces the fitting groove (56). The one end of the wire (64) is connected to the transmission part (63) of (61), the other end of the wire (49) is connected to the switching lever (49), and the work machine mounting part (50) is connected. When the work implement (B) is attached, the mounting pin (58) detects the detection mechanism.
The detection part (62) of the (N) detection lever (61) is pressed downward,
Pull the wire (64) and operate the switching lever (49) in the OFF direction to move the switching lever (49) to the wire (3).
2) Slide the pipe shaft (30) of the speed ratio switching mechanism (19) that is interlocked with each other to move the upper and lower cam rollers (29a) (29b) and the upper and lower cam surfaces.
(23a) and (23b) are not brought into contact with each other, and the steering wheel speed increasing device (9) is maintained in a constant speed operation state.

[Brief description of drawings]

FIG. 1 is a schematic side view of a safety device according to the present invention. FIG. 2 is an overall side view of a tractor having the same safety device. FIG. 3 is a side view of the constant velocity ratio switching mechanism. FIG. 4 is a plan view of the same. FIG. 5 is a vertical cross-sectional view of the steering wheel speed increasing device. FIG. 6 is a side view of the steering system. (B): Working machine (N): Detection mechanism (4): Rear wheel (5): Front propeller shaft (6): Final drive device (7): Front wheel (8): Steering wheel (9): Steering wheel Gearbox (19): Speed ratio switching mechanism (50): Work machine mounting part

Claims (1)

[Scope of utility model registration request] 1. Front and rear wheels (7), (4) can be driven, and front wheels
Steering wheel speed increasing device capable of speed ratio switching between the final drive device (6) of (7) and the front propeller shaft (5)
The steering wheel speed increasing device (9) can be switched from the constant speed operating state to the speed increasing operating state by the speed ratio switching mechanism (19) interlockingly connected to the steering wheel (8) via (9). The speed ratio switching mechanism (19) is interlocked with a switching lever (49) for manually switching the steered wheel speed increasing device (9) between a constant speed operating state and a speed increasing operating state. The working machine mounting part (50) is equipped with a detection mechanism (N) that detects whether or not the implement (B) is mounted, and the detection mechanism (N) detects the mounting of the implement (B). A safety device for a vehicle with a traveling wheel speed increasing device, which is interlocked with a switching operation of the steering wheel speed increasing device (9) to a constant speed operation state by the switching lever (49), the detection mechanism (N) Attach the mounting pin (58) of the implement (B) to the mounting plate (57) to which the detection lever (61) is rotatably pivoted, and attach the mounting pin (58) to the detection lever (61). Mounting A detection part (62) that extends in a direction substantially orthogonal to the direction and rotates when the mounting pin (58) contacts, and a transmission part that rotates in conjunction with the rotation operation of the detection part (62). (63) is provided, and one end of the wire (64) is connected to the transmission section (62),
A safety device for a vehicle with a traveling wheel speed increasing device, characterized in that the other end of the wire (64) is connected to the switching lever (49).