JP4164063B2 - Steering lock device for passenger-type traveling vehicle - Google Patents

Description

  The present invention relates to a steering lock device in a riding type traveling vehicle such as a riding rice transplanter.

Conventionally, a clutch that transmits a driving force to a wheel of a traveling machine body so as to be freely transmitted, a brake that brakes the wheel, a clutch pedal that can be stepped on to operate the clutch and the brake, and a travel of the traveling machine body from outside the vehicle are controlled. A riding paddy field work vehicle including a ground operating tool and a steering lock device that locks the direction of a wheel in a straight traveling direction is known (see, for example, Patent Document 1).
JP 2002-347478 A

  When the traveling machine body is operated from outside the vehicle using the ground operation tool, the steering lock device is operated to lock the direction of the wheels in the straight traveling direction. However, the steering lock device operates by operating a dedicated operation tool or a ground operation tool. For this reason, when using a dedicated operation tool, there is a drawback that forgetting the lock may occur. On the other hand, when the steering lock device is operated by operating the ground operation tool, the direction of the wheel is locked at the start of traveling of the traveling machine body, so there is a drawback that there is no guarantee that the traveling direction at the start of traveling is straight. .

  The steering lock device for a riding type traveling vehicle according to the present invention for solving the above-described problems performs a clutch for transmitting a driving force to the wheels 1 and 2 of the traveling machine body 3 so as to be able to freely enter and disengage the wheels 1 and 2. A brake, a clutch pedal 14 that can be stepped on to operate the clutch and the brake, a ground operating tool 15 that is provided at the front of the traveling machine body 3 so as to be swingable up and down, and controls the traveling of the traveling machine body 3 from the outside of the vehicle; A clutch mechanism including a linkage mechanism for linking the up-and-down swing operation of the ground operating tool 15 to the clutch and brake operation system of the clutch pedal 14; and a steering lock device for locking the directions of the wheels 1 and 2 in the straight direction. 14 in the depressed state, the clutch and the brake are operated so that the driving force to the wheels 1 and 2 is cut off and the wheels 1 and 2 are braked. In the riding type traveling vehicle that is configured to operate the clutch and the brake so that the driving force is transmitted to the wheels 1 and 2 by the downward swing and the braking of the wheels 1 and 2 is released by the linkage by the structure. The steering lock device is configured to automatically lock the wheels 1 and 2 when the operation system of the clutch and brake and the ground operation tool 15 side are switched to the linked state by the linkage mechanism. .

  In order to perform traveling control of the traveling machine body by the ground operation tool, it is necessary to switch the operation system of the clutch and brake and the ground operation tool side to the linked state by the linkage mechanism. When traveling control of the traveling machine body by the ground operation tool is performed, in order to travel the traveling machine body straight, it is necessary to lock the direction of the wheels in the straight traveling direction. According to the structure of the present invention configured as described above, since the operation system of the clutch and brake and the ground operation tool side are linked, the steering lock device automatically locks the direction of the wheel in the straight traveling direction. The wheel lock is not forgotten by the steering lock device, and the inconvenience of the traveling vehicle turning when the traveling operation of the traveling vehicle by the ground operating tool is prevented is prevented.

  1 and 2 are a side view and a main part plan view of a riding rice transplanter which is a riding type traveling vehicle equipped with a ground operating tool of the present invention. This riding rice transplanter has a structure in which a planting work machine 6 is connected to a rear side of a traveling machine body 3 having front and rear wheels 1 and 2 via a lifting link mechanism 4 as in the prior art.

  The traveling machine body 3 is provided with a driver's seat 11. The driver seat 11 includes a seat 8. In the driver's seat 11, a front operation panel 9 is provided in front of the seat 8. A steering handle 12 projects from the front operation panel 9. By turning the steering handle 12, the front wheel 1 can be operated to steer the traveling machine body 3.

  A main transmission lever 13 is provided on the front operation panel 9 so as to be able to swing left and right and back and forth. By shifting the main speed change lever 13 left and right and back and forth, the traveling machine body 3 can be switched between speed change and forward and backward movement.

  From the floor of the driver's seat 11, a clutch brake pedal 14 is provided so as to be depressed. By operating the clutch brake pedal 14, it is possible to operate a clutch (main clutch) that transmits the driving force from the engine so as to enter the transmission and a brake that brakes the front and rear wheels 1 and 2. The front and rear wheels 1 and 2 are driven by the driving force output from the transmission.

  The clutch brake pedal 14 brakes the front and rear wheels 1 and 2 by turning off the driving force to the transmission and operating the brake in the depressed state by the operation of the operation system described later. By releasing the pedal (releasing the foot from the clutch pedal 14), the clutch brake pedal 14 swings upward to return to the initial position, the main clutch is engaged and activated, and the brake is deactivated. Release the wheel brake.

  As a result, the operator can sit on the seat 8 and operate the main speed change lever 13 in a state where the depression of the clutch brake pedal 14 is released, thereby shifting the traveling machine body 3 forward or backward.

  Therefore, the planting work machine 6 is lowered to ground the float 7 to the farm field, the traveling machine body 3 is run as described above, and the planting work machine 6 is driven to perform seedling planting work on the farm field. be able to. The brake stops traveling while the traveling machine body 3 is traveling, and functions as a parking brake while the traveling machine body 3 is stopped.

  A bonnet 10 that covers the upper side of the engine is provided in front of the traveling machine body 3. A ground operating tool 15 is provided in front of the bonnet 10 so as to be swingable up and down, located at the front end portion of the traveling machine body 3. As will be described later, the traveling of the traveling machine body 3 can be operated from outside the vehicle by swinging the ground operating tool 15 up and down.

  As shown in FIGS. 3 to 5, the clutch brake pedal 14 is attached to the tip of the pedal arm 16. The base end portion of the pedal arm 16 is integrally attached to a pedal fulcrum shaft 17 that is pivotally supported on the body frame 3a side. The clutch brake pedal 14 is swingable up and down around the pedal fulcrum shaft 16.

  A connecting rod 18 is connected to the pedal fulcrum shaft 16. The other end of the connecting rod 18 is connected to a shaft 19 that is pivotally supported on the machine body frame 3a side. The shaft 19 is provided with an arm 21 and an arm 22. The arm 21 is connected to a rod 23 for operating the brake. The brake is operated by the clutch brake pedal 14 via the rod 23.

  The arm 22 is linked to an arm 26 of a shaft 24 that is pivotally supported on the machine body frame 3a side. A clutch arm 27 is provided at the end of the shaft 26. A clutch roller 28 is rotatably supported on the clutch arm 27. A transmission belt 37 is wound around an output pulley 32 provided on the output shaft 31 of the engine 29 and an input pulley 36 provided on the input shaft 34 of the transmission (HST 33).

  The clutch roller 28 is in sliding contact with the transmission belt 37. A clutch spring 38 is interposed between the shaft 24 and the body frame 3a. The clutch roller 28 applies tension to the transmission belt 37 to transmit the driving force by the clutch spring 38. The main clutch is a belt tension clutch as described above.

  The clutch brake pedal 14 is biased to the return state by the clutch spring 38. In the return state of the clutch brake pedal 14, the main clutch is maintained in the engaged state by the clutch spring 38 as described above. The aforementioned rod 23 keeps the brake in the operated state when the clutch brake pedal 14 is returned.

  The depression of the clutch brake pedal 14 is performed against the urging force of the clutch spring 38. When the clutch brake pedal 14 is depressed, the arm 22 operates the arm 24, and the clutch arm 27 swings about the shaft 24 as an axis. The main clutch is disengaged. The rod 23 is operated via the arm 21 when the clutch brake pedal 14 is depressed, and the brake is applied to actuate (brake the front and rear wheels 1 and 2).

  When the foot is released from the clutch brake pedal 14, the clutch brake pedal 14 is restored by the urging force of the clutch spring 38. With the above configuration, when the clutch brake pedal 14 is depressed, the driving force to the transmission is cut and the front and rear wheels 1 and 2 are braked. Further, when the depression of the clutch brake pedal 14 is released to return to the return state, the driving force is transmitted to the transmission, the driving force is transmitted to the front and rear wheels 1 and 2, and the braking of the front and rear wheels 1 and 2 is released.

  A mounting shaft 39 for mounting the ground operating tool 15 is provided on the front side of the body frame 3a. A holder 41 is supported on the mounting shaft 39 so as to be rotatable. Both ends of the frame 42 of the ground operating tool 15 having a U shape in plan view are slidably inserted into the holder 41.

  The frame 42 slides back and forth with respect to the holder 41, and can be turned up and down about the attachment shaft 39 via the holder 41. The frame 42 and the holder 41 rotate integrally. The ground operating tool 15 is provided on both end sides of the frame 42 so as to protrude upward. As a result, the ground operating tool 15 swings up and down around the mounting shaft 39 and slides back and forth.

  On the other hand, a snap receiver 43 is integrally provided below the left and right holders 41. A snap pin 44 is provided on the frame 42. When the frame 42 is slid rearward so that the snap pin 44 fits into the snap receiver 43, the frame 42 is held in the stored state.

  A stopper pin 46 is provided at one end of the frame 42 so as to protrude inward. When the snap pin 46 is removed from the snap receiver 43 and the frame 42 is slid forward, the stopper pin 46 comes into contact with the end portion of the holder 41 to prevent the frame 42 from coming off, and the frame 42 is pulled out.

  Note that a rotation restricting member 45 is provided on the side of the machine body frame 3 so as to be positioned above a collar portion extending to one rear of the frame 42. When the frame 42 is in the stored state, the rotation of the frame 42 is restricted by the contact between the rotation restricting member 45 and the frame 42. However, since the flange portion of the frame 42 is positioned in front of the rotation restricting member 45 in the pulled-out state of the frame 42, the frame 42 can be rotated.

  One holder 41 is provided with a receiving body 47. The receiving body 47 protrudes above and below the mounting shaft 39. A compression spring 48 is interposed between the lower side of the receiving body 47 and the body frame 3a. The compression spring 48 urges the holder 41 to rotate upward via the receiving body 47.

  The upper side of the receiving body 47 is in contact with a stopper pin 50 provided on the machine body frame 3a side, and the rotation position of the holder 41 is regulated and positioned. When the holder 41 is positioned by the contact between the receiving body 47 and the stopper pin 50, the frame 42 is substantially horizontal and the ground operating tool 15 is substantially vertical.

  As described above, the ground operation tool 15 is in the retracted posture in which the ground operating tool 15 stands near the front end of the traveling machine body 3 depending on the storage state of the frame 42. The ground operating tool 15 becomes a working posture drawn forward from the retracted posture depending on the pulled-out state of the frame 42. The ground operating tool 15 can be freely switched between a retracted position and a working position by sliding back and forth. The retracted posture is held when the snap pin 44 fits into the snap receiver 43. The ground operating tool 15 can swing downward only in the working posture.

  The ground operating tool 15 is biased to a standing posture by the biasing force of the compression spring 48. Therefore, as shown in FIG. 6, the downward swing of the ground operating tool 15 needs to be operated against the urging force of the compression spring 48, and the compression spring 48 is released when the hand is released from the ground operating tool 15. The ground operating tool 15 returns to a substantially vertical standing state by the urging force.

  An arm 49 protrudes from the other holder 41. Between the above-described shaft 24 and the mounting shaft 39, a shaft 51 is rotatably supported on the body frame 3a side. A pipe 52 is rotatably fitted on the shaft 51. An arm 53 projects from the pipe 52.

  The arm 49 of the holder 41 and the arm 53 of the pipe 52 are connected via a connecting arm 54. The pipe 52 rotates about the shaft 51 by the vertical swing operation of the ground operating tool 15. The shaft 51 is integrally provided with a rod-like steering lock member 56 protruding downward.

  A fulcrum shaft 57 is provided on the end side of the shaft 51 in the body frame 3a. As shown in FIGS. 7 and 8, a triangular plate 58 is rotatably supported on the fulcrum shaft 57. A lock lever 59 is integrally attached to the triangular plate 58. The lock lever 59 and the triangular plate 58 rotate integrally with the fulcrum shaft 57 as an axis. A boss 62 of the interlocking arm 61 is attached to the end of the shaft 51 so as to rotate integrally. The interlocking arm 61 and the triangular plate 58 are connected by a spring 63.

  A triangular plate 64 is also rotatably supported on the fulcrum shaft 57. The triangular plate 64 rotates separately from the triangular plate 58. A plate-like lock member 66 is pivotally supported at one apex portion of the triangular plate 64 so as to be rotatable. A spring 67 is provided between the lock member 66 and the body frame 3a. The lock member 66 is biased upward by the spring 67.

  A pin 68 is provided at the other vertex of the triangular plate 64. The pipe 52 provided on the shaft 51 is provided with a regulating arm 69 (see FIG. 11) that abuts the pin 68 provided on the triangular plate 64 on the upper side at a portion corresponding to the triangular plate 64. Yes. The rotation of the triangular plate 64 is restricted by the restriction arm 69, and the rotation angle (position) of the triangular plate 64 is determined by the swing angle of the restriction arm 69, that is, the swing angle of the ground operating tool 15.

  The lock member 66 is provided with a pin 71. The pin 71 contacts the rear end surface of the lock lever 59. The rotation of the lock member 66 is restricted by the lock lever 59, and the rotation angle (position) of the lock member 66 is determined by the swing angle of the lock lever 59. A shaft 72 is provided behind the shaft 51 on the side of the body frame 3a. An arm 73 is rotatably supported on the shaft 72. The arm 73 and the pedal fulcrum shaft 17 are connected by a rod 74.

  When the lock lever 59 is swung backward as shown in FIG. 9 with the clutch brake pedal 14 depressed, the lock member 66 is brought into contact with the lock lever 59 by the pin 71 of the lock member 66 and the spring 67. Rotate downward against the urging force and engage with the arm 73. The lock member 66 engages with the support shaft of the rod 74 in the arm 73.

  Due to the swing of the triangular plate 58 accompanying the swing of the lock lever 59, the shaft 51 rotates through the spring 63, and the steering lock member 56 rotates. Since the steering lock member 56 protrudes downward, the steering lock member 56 rotates rearward.

  As shown in FIG. 10, a receiving arm 78 is attached to the pitman arm 77 to which the left and right tie rods 76 are connected so as to protrude forward. The receiving arm 78 is provided with a recess 79 into which the steering lock member 56 can be inserted. The recess 79 is provided so as to face the steering lock member 56 when the steering handle 12 is in the straight traveling state.

  When the steering handle 12 is in the straight traveling state by the rotation of the steering lock member 56, the steering lock member 56 is inserted into the recess 79 in the receiving arm 78 of the pitman arm 77, and the steering lock member 56 and the receiving arm 78 are connected. The steering handle 12 is locked in the straight traveling state.

  If the steering handle 12 is not in the straight traveling state, the steering lock member 56 is not inserted into the concave portion 79 and abuts against the front end surface of the receiving arm 78 even if the lock lever 59 is swung back as described above. However, since the rotation of the shaft 51 is performed via the spring 63, the rocking operation of the lock lever 59 is permitted when the spring 63 extends.

  At this time, the spring 63 receives the steering lock member 56 and elastically presses it against the front end surface of the arm 78. Since the steering lock member 56 is not inserted into the recess 79, the turning operation of the steering handle 12 can be performed. 12 is locked straight.

  On the other hand, when the lock member 56 and the arm 73 are engaged as described above, the triangular plate 64 is urged counterclockwise in FIG. 9 by the return urging force of the clutch brake pedal 14 via the lock member 56. At this time, the swing angle of the triangular plate 64 is determined by the swing angle of the ground operating tool 15 as described above.

  Therefore, the swing position of the triangular plate 64 is adjusted according to the swing angle of the ground operating tool 15, and the rotation angle of the pedal fulcrum shaft 17 is controlled via the rod 74 according to the swing position of the triangular plate 64. The main clutch and brake are operated.

  By engaging the lock member 66 and the arm 73 as described above, the vertical swing operation of the ground operating tool 15 is linked to the operation system of the main clutch and the brake by the clutch brake pedal 14, and the ground operating tool 15 is swung. By doing so, it becomes possible to operate the main clutch and the brake.

  When operating the ground operating tool 15, as shown in FIG. 11, the ground operating tool 15 is pulled out to the working posture, thereby extending the pivoting fulcrum ( The distance from the mounting shaft 39) to the force point (operation position) is extended, and the downward swinging operation can be easily performed. Further, it is possible to prevent the ground operating tool 15 from obstructing the forward view of the operator in the driver's seat 11 in the retracted posture, and it is possible to achieve both compact storage that does not obstruct the forward view and easy swing operation.

  When the ground operating tool 15 is swung downward from the state of FIG. 11 to the state of FIG. 12, the holder 41 is rotated clockwise, and the arm 49 is swung forward. Move. As a result, the clutch brake pedal 14 returns to the return direction, so that the main clutch is engaged and activated, and the brake is activated. When the hand is released from the ground operating tool 15 that has been swung downward, the ground operating tool 15 returns to the standing state, the main clutch is disengaged, and the brake is applied.

  As a result, the traveling machine body 3 moves forward, and the operator can easily perform traveling beyond the heel, traveling on a truck bed, and the like. The traveling operation lever 15 is positioned in front of the traveling machine body 3, and when traveling the traveling machine body 3 by an operation from outside the vehicle, the traveling operation lever 15 is pushed so that the operator pushes the front side of the traveling machine body 3 downward. Manipulate. Therefore, the head-up of the traveling machine body 3 during traveling can be prevented with a small force by the lever principle, and the head-up during traveling of the traveling machine body 3 by the traveling operation lever 15 can be easily suppressed.

  On the other hand, when the clutch brake pedal 14 is not depressed, the position of the support shaft of the rod 74 in the arm 73 is separated to the rear side of the lock member 66, so that the lock member 66 and the arm 73 are not engaged. When the lock member 66 and the arm 73 are not engaged, the triangular plate 64 and the rod 74 are not linked, so that the main clutch and the brake are operated even when the ground operating tool 15 is swung up and down. There is nothing.

  The rocking position of the lock lever 59 that engages the lock member 66 and the arm 73 becomes the lock position that links the vertical rocking operation of the ground operating tool 15 to the operation system of the main clutch and the brake by the clutch brake pedal 14. When the lock lever 59 is switched to the locked position while the clutch brake pedal 14 is depressed, the main clutch and the brake are operated by the ground operating tool 15 as described above, so that the traveling machine body 3 can travel.

  Then, by swinging the ground operating tool 15 downward, the traveling machine body 3 can travel from outside the vehicle. When the hand is released from the ground operating tool 15, the traveling of the traveling machine body 3 is stopped. In particular, when the steering handle 12 is moved straight and the lock lever 59 is switched to the locked position, the steering handle 12 is locked in the straight traveling state, and the traveling vehicle body 3 is caused to travel from the outside of the vehicle by operating the ground operating tool 15 (swinging downward). At this time, the traveling machine body 3 can be moved straight.

  At this time, the operation system of the main clutch and brake and the ground operating tool 15 side are linked, and the direction of the front wheels 1 and 2 is automatically locked in the straight traveling direction, so that forgetting to lock the wheels 1 and 2 is prevented. At the same time, when the traveling machine body 3 is operated by the ground operating tool 15, straight traveling of the traveling machine body 3 is ensured, and inconvenience that the traveling machine body 3 tries to turn is prevented.

  If the steering handle 12 is not locked when the lock lever 59 is switched to the locked position, the steering handle 12 is automatically locked in the straight position when the steering handle 12 is turned right and left.

It is a side view of a riding rice transplanter. It is a top view of the traveling body of a riding rice transplanter. It is a principal part top view which shows the linked state of a clutch brake pedal and a ground operating tool. It is a principal part side view which shows the linked state of a ground operating tool. It is a principal part front view of a ground operation tool part. It is a principal part side view which shows the rocking | fluctuation state of a ground operating tool. It is a principal part front view which shows the attachment state of a lock lever. It is a principal part side view at the time of the return state of a clutch brake pedal part. It is a principal part side view of the clutch brake pedal part at the time of the cooperation state of a ground operating tool. It is a principal part top view of a pitman arm part. It is a principal part side view which shows the state which pulled out the ground operating tool to the working position. It is a principal part side view which shows the downward rocking | fluctuation state of a ground operating tool.

Explanation of symbols

1 Front wheel
2 Rear wheels
3 Driving body 14 Clutch brake pedal (clutch pedal)
15 Ground control tools

Claims (1)

  A clutch that transmits the driving force to the wheels (1) and (2) of the traveling machine body (3) and transmits the driving force freely, a brake that brakes the wheels (1) and (2), and a stepping that operates the clutch and the brake An operable clutch pedal (14), a ground operating tool (15) which is provided at the front of the traveling machine body (3) so as to be swingable up and down, and controls the traveling of the traveling machine body (3) from the outside of the vehicle, 14) a linkage mechanism for linking the up-and-down swing operation of the ground operating tool (15) to the clutch and brake operating system, and a steering lock device for locking the directions of the wheels (1) and (2) in the straight direction. And the clutch pedal (14) is operated to operate the clutch and brake so as to cut the driving force to the wheels (1) and (2) and brake the wheels (1) and (2) in the depressed state. Ground control tool (15) The clutch and the brake are operated so as to transmit the driving force to the wheels (1) and (2) and release the braking of the wheels (1) and (2) by the downward swinging by the linkage by the engaging mechanism. In the riding type traveling vehicle having the configuration, when the steering lock device is switched to the linked state between the clutch and brake operating system and the ground operating tool (15) side by the linkage mechanism, the wheels (1), ( A steering lock device in a riding type traveling vehicle configured to perform the locking of 2).

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