JP2013133669A - Operation lever lock device for work vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an operation lever lock device that consists of a small number of components and can lock an operation lever with simple constitution.SOLUTION: The operation lever lock device for work vehicle comprises a lock hole (17) provided to a fitting bracket (16) at a base part of an operation lever (15), and a locking rod (19) with a lever that is supported slidably in a shaft core direction on a support bracket (20) at a position corresponding to the lock hole (17), and can be switched between a locked state in which the rod is inserted into the lock hole (17) and locked and an unlocked state in which the rod is extracted from the lock hole (17) to be unlocked.

Description

  The present invention relates to an operation lever locking device for a work vehicle such as a front loader.

  Patent Documents 1 and 2 disclose a lock device that restricts / releases the swinging operation of an operation lever for controlling the working part of a work vehicle.

JP-A-2005-54510 JP 2007-255150 A

The conventional configuration described above has a large number of parts and a complicated configuration.
An object of the present invention is to implement an operation lever lock device having a simple configuration with a small number of parts.

In order to solve the above problems, the present invention has taken the following technical means.
That is, according to the present invention, the lock bracket (17) provided in the mounting bracket (16) of the base of the operation lever (15) and the support bracket (20) at a position corresponding to the lock hole (17) are provided. For locking with a lever, which is supported so as to be slidable in the axial direction and can be switched between a locked state in which the lock is inserted and locked in the lock hole (17) and an unlocked state in which the lock is released by being removed from the lock hole (17). It is characterized by comprising a rod (19).

  When the locking rod (19) of the operating lever (15) is inserted into the locking hole (17) of the operating lever mounting bracket (16), the operating lever (15) is in the restricted lock state at the neutral position. When the lock rod (19) is removed from the lock hole (17), the restriction lock state is released and the operation lever (15) becomes free, and the working part can be freely controlled by any operation of the operation lever. Can do.

  The lock device comprising the lock rod (19) integrated with the lock lever (18) and the support bracket (20) for slidably supporting the rod has a simple structure, requires a small number of parts, and is inexpensive. can do.

  According to a second aspect of the present invention, in the first aspect, the support bracket (20) for supporting the locking rod (19) is formed in a U shape, and the rotation of the locking rod (19). A guide part (21) in the direction and a guide part (22) in the insertion direction are formed and provided.

  The locking rod (19) is inserted and supported by the U-shaped support bracket (20), and the rotation in the rotation direction and the sliding in the insertion direction are smoothly and smoothly performed by the guide portions (21) and (22) formed thereon. Can be done.

  The guide function of the locking rod can be constituted by one part of the support bracket, unlike the conventional one where the guide component parts are constituted by several points, and can be implemented at low cost.

  According to a third aspect of the present invention, in the first or second aspect, between the locking rod (19) and the support bracket (20), a rotational direction and an insertion direction of the locking rod (19) are provided. The spring means (25) for providing the combined action force is provided.

  When the rod (19) is rotated counterclockwise against the spring force, the rod locking pin (23) corresponds to the guide groove (22b) of the support bracket (20), and the rod (19) It is slid in the insertion direction by the tension of 25) and inserted into the lock hole (17) of the operation lever (15).

  Since the acting force in the rotation direction and insertion direction of the locking rod (19) can be applied by a single spring (25), it can be easily configured without using a plurality of springs and can be implemented at low cost. it can.

  According to the first aspect of the present invention, the control lever can be easily locked with a simple structure using only the locking rod with the lever and the support bracket for supporting the rod, and the number of parts can be reduced at low cost. can do.

  According to the second aspect of the present invention, in addition to the effect of the first aspect, the locking rod is inserted and supported by the U-shaped support bracket and rotated in the rotational direction by the guide portion formed thereon. In addition, since the sliding in the insertion direction can be performed stably and smoothly and the U-shaped support bracket itself has a rod guide function, the number of components can be reduced by one point, thereby reducing the cost.

  According to the third aspect of the present invention, in addition to the effect of the first or second aspect, it is possible to apply the acting force in the rotation direction and the insertion direction of the locking rod with a single spring, and the number of parts can be reduced. Can be implemented at a lower cost.

Side view of work vehicle Expanded side view of the main part Perspective view of the main part Perspective view of the main part Perspective view of main part of operation lever operation mechanism Perspective view of operation lever lock device Perspective view of the main part Side view showing the support structure of the operating lever Rear view of the main part Side view showing control lever structure Side view showing the operating lever lock mechanism Side view showing the control lever holding mechanism (A) Perspective view of step sheet, (B) Step sheet split perspective view Top view when packing tractor The perspective view which shows the assembly operation state of a right-and-left division sheet Side view showing engine support structure Perspective view showing the mounting base of the rear mount Perspective view showing the mounting base of the front mount The perspective view which shows the support structure of a fuel tank Perspective view of the main part The perspective view of the connection tool of the principal part same as the above.

An embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a tractor equipped with a front loader 3 at the front as an example of a work vehicle. The tractor T transmits the rotational power of an engine mounted in the hood at the front of the vehicle body 1 to a mission case. 2 and the rotational power decelerated by the transmission is transmitted to the front wheels 4 and the rear wheels 5. A steering handle 6 for steering the left and right front wheels 4 and 4 is provided behind the engine, and a driver's seat 7 is installed behind the steering handle 6.

  The front loader 3 includes a boom 11 that moves up and down by a hydraulic lifting cylinder 10, a bucket 13 that is pivotally supported by the tip of the boom 11 and swings up and down by a hydraulic vertical cylinder 12, and a control valve that controls expansion and contraction of the cylinders 10 and 11. A main body 14 and an operation lever 15 for controlling the valve of the control valve main body 14 are provided.

  The operation lever 15 is provided so as to be swingable in the front-rear direction and the left-right direction. The hydraulic elevating cylinder 10 is expanded and contracted by operating the operation lever in the front-rear direction, and the hydraulic upper and lower cylinders 12 are expanded and contracted by operating in the left-right direction.

The mounting bracket 16 at the base of the operation lever 15 is provided with a lock hole 17 for disabling operation of the operation lever in the front-rear and left-right directions.
At a portion corresponding to the lock hole 17 at the neutral position of the operation lever 15, a lock rod 19 integrated with the lock lever 18 is supported by a support bracket 20 formed in a U-shape so as to be slidable in the axial direction. When the rod 19 is inserted into the lock hole 17, the operation lever 15 is locked in the neutral position. When the rod 19 is removed from the lock hole 17, the operation lever is unlocked. It has come to be. The support bracket 20 is attached to the steering column of the handle post.

The U-shaped support bracket 20 is formed with a guide portion 21 in the rotational direction of the locking rod 19 and a guide portion 22 in the insertion direction into the lock hole 17.
The rotation direction guide portion 21 includes a guide pin 21 a integrated with the rod 19 and a guide groove 21 b formed in the support bracket 20. The insertion direction guide portion 22 includes a notch guide groove 22a formed on the left side wall portion of the U-shaped support bracket 20 and a guide groove 22b formed on the right side wall portion of the bracket. Further, the rod 19 is provided with a locking pin 23 and a stopper 24.

  A spring 25 is provided between the support bracket 20 and the locking rod 19 to constantly urge the locking rod 19 in the rotational direction (clockwise) and the insertion direction (sliding direction into the lock hole). . That is, by attaching a single spring at an angle, the locking rod 19 is pulled in the rotation direction and the insertion direction, so that switching between the locked state and the unlocked state can be easily performed.

  In short, when the rod 19 is rotated counterclockwise (from the state of FIG. 6) against the pulling force of the spring 25 by the lock lever 18, the locking pin 23 of the rod 19 corresponds to the guide groove 22b of the support bracket 20. The rod 19 slides in the insertion direction by the spring force and is inserted into the lock hole of the operation lever mounting bracket, and the operation lever 15 is securely locked in the neutral position as shown in FIG.

  8 and 9 show a working machine valve that is hydraulically controlled by operation of the operation lever 15, and a fulcrum shaft 26 composed of a vertical axis 26Y and a horizontal axis 26X of the operation lever 15 that swings left and right and back and forth is provided on the valve body. 14 is installed on the support member 27 attached to the valve body. As a result, the distance between the operation lever and the valve is very close, so the link 28 connecting the operation levers may be shorter and smaller, and may be configured with less strength.

  In the case where the operation lever for controlling the working unit is disposed in the vicinity of the steering handle, as shown in the example of FIG. 10, the operation lever 15 is inclined backward from the fulcrum portion Q, and the lever center of gravity is from the rotation fulcrum. It is configured to be located on the rear side of the vehicle body, and is set so that the neutral position F of the free flow lock position of the operation lever is substantially equivalent to the vertical position with respect to the vehicle body, and the lever between the fulcrum part Q and the grip part G By configuring the member with a hollow pipe, it is possible to reduce the load in the releasing direction due to its own weight during free flow.

  In the example of FIG. 11, the free flow position of the lever can be stably held by inserting the lock pin 30 from the outside of the operation column to the lever support member at the free flow lock position F of the operation lever.

  In the example of FIG. 12, a guide member 31 formed of a spring wire rod is disposed outside the operation lever 15, and the guide member 31 is pivotally connected to the lever cover body 32 so as to be pivotable. By rotating and guiding the guide member 31 to the lever side at the free flow position F, the operation lever at the free flow position can be stably held by the spring force of the guide member.

  A rubber step seat is laid over the entire width of the vehicle body at the floor step portion of the tractor in front of the driver's seat. If this step seat 33 is of a full width integrated configuration as shown in FIG. There was a problem that sometimes became a packing obstacle. In this example, the step seat 33 is divided into left and right, and the left and right seats 33L and 33R are assembled and joined so that the side with few pedals can be detached alone. Therefore, when packing and transporting, as shown in FIG. 14, the side where the removable side is removed and the full width is compressed (for example, two tractors are arranged in opposite directions to be arranged side by side so that the side where the sheet is removed faces each other. If it can be shipped by packing, it can be loaded in the packing container.

In addition, as shown in the example of FIG. 15, the left and right divided sheets 33L and 33R can ensure sufficient strength at the time of assembly and joining by the joining bracket 34 welded to one side.
The joining bracket 34 is welded to the side that is not removed during packaging. The removal side step sheet is placed on the joint bracket and connected and fixed with a bolt or the like.

  As shown in FIGS. 16 and 17, in a work vehicle in which the engine E is floating mounted on the vehicle body 1, a rear mount 35 at the rear of the engine is integrated with a mounting base 38 of a steering column 37, and The rigidity of the mount support structure is secured by integrating the two left and right mounting bases of the rear mounts 35L and 35R. According to this, not only can the number of parts be reduced, but also problems such as sudden start and swaying due to the inertia of the engine when running on uneven parts, causing interference to surrounding fixing members, such as the radiator 39, etc., causing unexpected damage. Can be eliminated.

  Further, as shown in FIG. 18, the front mount mounting base 40 of the left and right front mounts 36L and 36R in front of the engine is also integrated with the left and right bases as a single component. The left and right frames 1L and 1R are connected so as to function as reinforcing members for the left and right frames 1L and 1R, and the mounting base 40 is also configured to function as a support base for the front axle support member.

  In the example of FIG. 19, a fuel tank 41 is disposed in a lower part of an operator seat (driver's seat) 7 by providing a tank space over a rear wheel upper region of the fender. The fuel tank 41 includes a seat bracket 42 that supports the seat base and a rear frame 44 that supports the lops 43, and the front and rear portions of the tank are connected by bolts. Thereby, the stable support strength of a tank is obtained.

  The tank 43 is attached to the rear frame 44 by bolts via a connector 45 as shown in FIG. 20, and the tank 43 is attached to the seat bracket 42 as shown in FIG. Bolts are connected via 45.

15 Operation lever 16 Mounting bracket 17 Lock hole 18 Lock lever 19 Locking rod 20 Support bracket 21 Rotation direction guide portion 22 Insertion direction guide portion 25 Spring

Claims (3)

  A lock hole (17) provided in the mounting bracket (16) at the base of the operation lever (15) is supported by the support bracket (20) so as to be axially slidable at a position corresponding to the lock hole (17). A lock rod (19) with a lever that can be switched between a locked state in which the lock is inserted and locked in the lock hole (17) and an unlocked state in which the lock is released by being removed from the lock hole (17). An operating lever locking device for a working vehicle.   The support bracket (20) for supporting the locking rod (19) is formed in a U shape, and the guide portion (21) in the rotational direction of the locking rod (19) and the guide portion in the insertion direction ( 22. The operation lever locking device for a work vehicle according to claim 1, wherein the operation lever locking device is provided.   Between the locking rod (19) and the support bracket (20), there is provided spring means (25) for applying a combined acting force in the rotational direction and insertion direction to the locking rod (19). 3. The operation lever locking device for a work vehicle according to claim 1, wherein the operation lever is locked.

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