JPH0626440Y2 - Interlocking structure of shift lever and accelerator lever in mobile agricultural machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Use The present invention relates to an interlocking structure of a shift lever and an accelerator lever in a mobile agricultural machine such as a cultivator.

(B) Conventional technology When switching the shift lever from the forward side to the reverse side, it may be dangerous if the speed remains the same. For example, as seen in Japanese Utility Model Laid-Open No. 52-50907, There is a system in which the accelerator lever is mechanically interlocked with each other, and when the shift lever is switched to the reverse side, the accelerator lever is actuated to switch to the low speed side.

(C) Problems to be solved by the invention However, in the above-mentioned prior art example, when the speed change lever is returned to the forward side, the accelerator lever is also returned to the original position and the machine body advances at high speed. Generally, it is not preferable that the speed changes when the traveling direction changes, and it is especially dangerous that the speed changes.

The present invention has been devised in view of such a point, and in short, when returning the shift lever from the reverse side to the forward side,
It is designed so that it does not act on the accelerator lever at all.

(C) Means for Solving the Problems Under such a problem, when the present invention moves the shift lever from the forward side to the reverse side, it acts on the accelerator lever to move the accelerator lever from the high speed side to the low speed side. In the interlocking structure of the accelerator lever and the speed change lever in the moving agricultural machine to be moved, when the speed change lever is moved from the forward side to the reverse side between the speed change lever and the accelerator lever, the speed change lever is pushed to rotate the accelerator. It consists of a cam that switches the lever to the low speed side, while moving the shift lever from the reverse side to the forward side, reverses on the spot to allow passage of the shift lever and keeps the accelerator lever in that position. The present invention provides a structure for interlocking an accelerator lever and a gear shift lever in a mobile agricultural machine, which is characterized by interposing a cam mechanism.

(E) Action By taking the above means, when the shift lever is switched from the forward side to the reverse side, the accelerator lever is switched to the low speed side, the speed is reduced and safety is maintained. However, when the vehicle is switched from the reverse side to the forward side, it does not act on the accelerator lever at all, so it is safe to move forward at the reverse speed.

(F) Embodiment Hereinafter, a preferred embodiment of the present invention will be illustratively described in detail with reference to the drawings.

As shown in FIGS. 1 and 2, the interlocking structure of the speed change lever and the accelerator lever is configured by disposing a cam mechanism 3 between the speed change lever 1 and the accelerator lever 2 in an associated manner.

The shift lever 1 has a normal structure that is movable along a guide groove 4a formed in the up-down direction of the guide plate 4 and that is capable of shifting operation between the upper forward F side and the lower reverse R side. Composed. Although not shown, the neutral position is also provided at an appropriate position.

The accelerator lever 2 is pivotally attached to a support shaft 5 and is appropriately formed by a friction mechanism 6 so that it can be held and operated at an arbitrary position between the high speed H side and the low speed L side, and the extension arm 2a is leftward from its base. Is extended toward the gear shift lever 1 side and is appropriately connected to a control mechanism (not shown) for adjusting the rotation speed of an engine (not shown) via an accelerator wire 7.

As shown in FIGS. 1 and 2, the cam mechanism 3 is an arm-shaped plate member that is long in the left-right direction, and has a long hole 9 extending in the longitudinal direction.
The elongated hole 9 is pivotally supported on the pivot shaft 10 so as to be rotatable and horizontally movable, and the middle position of the guide groove 4a through which the speed change lever 1 passes during the speed change and the extension arm.
2a has a cam 8 which faces both left and right ends within the range of the rotational movement around the support shaft 5, and a cam 8 which rotates clockwise around the pivot shaft 10 (clockwise in the embodiment). Stopper 11 that regulates rotation at a horizontal position that is horizontal
And a return spring 12 for urging the cam 8 clockwise to the position of the stopper 11. The left end portion of the cam 8 facing the guide groove 4a is formed in a tapered shape including an orthogonal upper surface 8a orthogonal to the longitudinal direction of the guide groove 4a and an inclined lower surface 8b that obliquely crosses to the right. The shift lever 1 in the middle of shifting from the reverse side to the reverse R side hits the orthogonal upper surface 8a of the cam 8 in an orthogonal manner, which causes the cam 8 to rotate around the pivot shaft 10 against the return spring 12. When it is gradually rotated clockwise to a certain angle and reaches a certain angle, the orthogonal upper surface 8a is disengaged from the guide groove 4a to the left, and only the shift lever 1 reaches the reverse R position, while the return spring 12 causes the original stopper 11 position to be reached. The cam 8 is designed to self-return, and conversely, the speed change lever 1 in the middle of the speed change from the reverse R side to the forward F side hits the inclined lower surface 8b of the cam 8 in an oblique manner, which causes This cam 8 slides on the upper surface of the stopper 11 against the return spring 12. While moving horizontally to the right, only the shift lever 1 reaches the forward F position, while the return spring 12 causes the cam 8 to self-return to its original position. On the other hand, the right end portion of the cam 8 is located below the extension arm 2a, and when the accelerator lever 2 is in the high speed H position, the extension end of the extension arm 2a is brought into contact with or near the lower surface of the extension arm 2a. Only when rotating counterclockwise around the pivot shaft 10 against the return spring 12 to a certain angle, the extension arm 2a is pushed up and the support shaft 5
The accelerator lever 2 can be rotated around to the low speed L position. At this time, since the rotation of the accelerator lever 2 is performed via the friction mechanism 6, the frictional resistance of the accelerator lever 2 becomes a resistance for the reverse gear shift switching operation of the speed change lever 1 and is less likely to be erroneously operated.

According to the above, the shift lever 1 and the accelerator lever 2 are
Like the normal structure, you can operate each independently,
However, since the cam 8 is rotated around the pivot shaft 10 during the reverse gear changeover operation of the shift lever 1 from the forward F side to the reverse R side, the accelerator lever 2 remains at the high speed H side. However, due to the rotation of the cam 8, the accelerator lever 2 is automatically returned to the low speed L position in an interlocked manner,
Even if the accelerator lever 2 is forgotten that the accelerator lever 2 is on the high speed H side and the reverse shift switching operation of the shift lever 1 is performed, the aircraft does not suddenly move backward. Further, when the forward shift change operation from the reverse R side to the forward F side of the speed change lever 1 is performed, only the cam 8 is horizontally moved to the right regardless of the accelerator lever 2, and the speed change lever 1 moves along the guide groove 4a. You will be able to pass to the forward F side.

FIG. 3 shows another interlocking structure of the speed change lever and the accelerator lever, and this interlocking structure is a cam interlocking with the speed change lever 1 at a midpoint of an accelerator wire 7 connecting the accelerator lever 2 and the control mechanism. The mechanism 3 is provided, which is largely different from the interlocking structure described above. First, the cam mechanism 3 does not have the stopper 11 described above, and therefore the cam 8 is rotatable with respect to the pivot shaft 10. Moreover, it is movable along the direction of the long hole 9 and, in the normal state, the operation amount of the accelerator lever 2 is set to a constant ratio A via the cam 8 which rotates around the pivot shaft 10. : The point is enlarged by B and transmitted to the control mechanism. Next, the cam 8 has the above orthogonal upper surface 8a and the inclined lower surface 8b.
Instead, there is a cam hole 13 with the required curved cam surface 13a.
The roller 1a axially attached to the tip of the speed change lever 1 is exposed in the cam hole 13. Even if the cam 8 is rotated around the pivot shaft 10 in conjunction with the operation of the accelerator lever 2, the operation of moving the shift lever 1 to the neutral N position and the forward F position is performed by freely moving the roller 1a into the cam hole. It can be done independently by arranging it so that it can be moved within 13 and when the accelerator lever 2 is in the low speed L position as shown by the dashed line in FIG. Even if the rearward R position is operated, the roller 1a can come close to the curved cam surface 13a of the cam hole 13, and when the accelerator lever 2 is at the high speed H position (solid line in FIG. 3), As shown by the dashed line in FIG. 3, when the gear shift lever 1 is operated to the reverse R position, the roller 1a moves to the curved cam surface.
The elongated hole 9 is moved while guiding 13a against the return spring 12 by the pushing and pivoting shaft 10.
The change rate of the ratio of A: B changes, the length of the accelerator wire 7 changes from L to 1 (L> l) and from T to t (T> t), and the speed becomes low. The vehicle speed reduction rate during reverse travel is appropriately determined in consideration of the curvature of the curved cam surface 13a, the rotational fulcrum position of the speed change lever 1, and the like so that it increases as the accelerator lever 2 is operated from the low speed L side to the high speed H side. To be done.

(G) Effect of the Invention As described above, according to the invention, when the accelerator lever 2 is operated to the high speed H side, when the gear shift lever 1 is operated to switch the reverse gear from the forward F side to the reverse R side, the cam mechanism 3 is operated. Since the accelerator lever 2 is automatically switched to the low speed L side, the engine rotation speed does not decrease at the time of the reverse gear shift operation of the gear shift lever 1 and the aircraft does not move backward rapidly, which improves safety. Can be achieved. Further, since the holding mechanism for switching the accelerator lever 2 is performed by the friction mechanism 6, the load at hand is reduced by the friction mechanism only during the reverse gear shifting operation of the shift lever 1 that returns the accelerator lever 2 to the low speed L side via the cam mechanism 3. The friction resistance due to 6 becomes heavy, and it becomes difficult to make an erroneous operation. When returning the shift lever 1 from the reverse R side to the forward F side, the shift lever 1 passes through the cam 8, but at this time,
The cam 8 only retracts and does not act on the accelerator lever 2 at all. Therefore, the speed of the aircraft is the same as the reverse speed and it is safe. Further, since the reverse vehicle speed can be adjusted by the accelerator lever 2, an axis for reducing the reverse vehicle speed,
It is possible to reduce gears and the like, which makes it possible to downsize the mission case and reduce weight.

[Brief description of drawings]

1 and 2 are explanatory views showing an embodiment of the interlocking structure of the shift lever and the accelerator lever according to the present invention, and FIG. 3 is an explanatory view showing another embodiment of the interlocking structure. (Code) 1 ... Shift lever 2 ... Accelerator lever 3 ... Cam mechanism 6 ... Friction mechanism F ... Forward position R ... Reverse position H ... High speed position L ... Low speed position

Claims (1)

[Scope of utility model registration request] 1. When the shift lever (1) is moved from the forward (F) side to the reverse (R) side, it acts on the accelerator lever (2) to move the accelerator lever (2) from the high speed (H) side to the low speed (H) side. In the interlocking structure of the accelerator lever and the shift lever in the mobile agricultural machine to be moved to the L) side, the shift lever (1)
When the shift lever (1) is moved from the forward (F) side to the reverse (R) side between the accelerator lever (2) and the accelerator lever (2), the shift lever (1) is pushed and rotated to rotate the accelerator lever (2). ) Is switched to the low speed (L) side, while the gear shift lever (1) is moved from the reverse (R) side to the forward (F) side, the vehicle moves backward to allow passage of the gear shift lever (1). , An interlocking mechanism for an accelerator lever and a speed change lever in a mobile agricultural machine, wherein a cam mechanism (3) consisting of a cam (8) for keeping the accelerator lever (2) held in its position is interposed.