JPS6315941Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a safety lock mechanism for a main shift lever.

Conventionally, the main gear shift lever was only lightly biased to the neutral position by a spring, etc.
If the operator caught his or her body or clothing while getting on or off the vehicle, the operator could easily move to the gear shift position and suddenly start the vehicle.

In this invention, an engagement recess to be engaged with the main shift lever is cut out in the neutral setting position of the guide groove, and the main shift lever is biased toward the recess to ensure safe operation of the main shift lever. It is intended to provide a locking mechanism.

An embodiment of this invention will be described in detail based on the drawings. A indicates an agricultural tractor, and this tractor A has a prime mover section 1 mounted on the front part of the body a, and a driving section 2 arranged behind it. Front wheels 3 and rear wheels 4 are arranged at the front and rear of both sides of the aircraft body a, respectively. The driving section 2 has a handle 5 and a seat 6 at the front and rear, respectively.
Fenders 7 are arranged on both sides of the seat 6, and a gear shift name plate 8 is attached to the left side of the seat 6, and a main gear shift lever 10 is inserted from the guide groove 9 provided on the gear shift name plate 8.
is protruded, and by operating both levers 10, the combination of gear meshes in the transmission case 11 below the seat 6 is changed to perform a speed change operation.

Here, the guide groove 9 is formed into a substantially H shape,
On the left side, the front and rear are respectively forward 2nd gear shift position F
2. The forward 3rd gear shift position is F3, and the front and rear of the right side are set as the forward 1st gear shift position F1 and the reverse shift position R, respectively, and the center of the left side is set as the neutral position N. , a portion of the guide groove 9 is cut out to form an engagement recess 12.

The main shift lever 10 has a guide groove insertion portion 1 at the tip.
The base end is bent along the inner wall of the fender 7 and extended to the vicinity of the mission case 11 via the L-shaped bracket 13.
It is interlocked and interlocked with a sliding shaft 14 arranged at 1.
The sliding shaft 14 is supported on both sides by bosses 15 provided on both sides of the upper part of the mission case 11, and is mounted so as to be slidable left and right and rotatable back and forth. In addition, a shift block engaging pin 16' is connected to the sliding shaft 14 through a pin mounting pipe 16 in the mission case 11, and the lower end of the engaging pin 16' follows the left and right sliding movement of the sliding shaft 14. Shift block 1 installed below
7 or 18. In the figure, 17' and 18' are shift forks, 17'' and 18'' are fork mounting shafts, and 19 is a transmission gear mounting shaft.

Further, spring receivers 20 and 21 are arranged on the opposite surfaces of the L-shaped bracket 13 and the boss 15, respectively,
A pressing spring 22 is interposed between both spring receivers 20 and 21, and the main shift lever 10 is moved into the guide groove 9.
is biased toward the neutral position N, so that the guide groove insertion portion 10' of the main shift lever 10 engages with the engagement recess 12 of the guide groove 9.

The pressing spring 22 is formed in a conical shape, and prevents lateral vibration of the spring 22, and when the spring 22 is contracted, it operates in the thinnest possible shape, allowing smooth left and right movement of the main shift lever 10. can be done.

In addition, 23 in the figure is a clutch pedal.

The embodiment of this invention is constructed as described above, and when changing gears, the guide groove insertion portion 10' of the main shift lever 10 is moved to each shift position of the guide groove 9, and the same operation is performed in the L position. The sliding shaft 14 is slid left and right or rotated back and forth through the letter-shaped flange 13,
The shift block engagement pin 16'' engages with either of the shift blocks 17, 18, and by interlocking these, the combination of gear engagement in the transmission case 11 is changed via the shift forks 17', 18'. be.

Furthermore, when the machine body a is stopped, if the guide groove insertion part 10' of the main shift lever 10 is removed from each gear shift position of the guide groove 9, the insertion part 10' will be moved to neutral by the bias of the spring 22. Position N
The main shift lever 10 is engaged with the engagement recess 12 of the main gear shift lever 10 and becomes locked, so that even if an unexpected force is applied to the main shift lever 10, it will not move to another gear shift position. Further, the main shift lever 10 is connected to each shift device F in the guide groove 9.
1, F2, and F3, the pressing spring 22 of the sliding shaft 14 biases the engagement recess 12 at the neutral position N of the guide groove 9, which is always directed outward, and the gear is fitted into another shift position. It prevents you from doing so.

Further, since the pressing spring 22 is formed in a conical shape, when it is contracted, it becomes as thin as possible, and the left and right movement of the main shift lever 10 is operated without any hindrance.

According to this invention, an engagement recess to be engaged with the main shift lever is cut out in the neutral setting position of the guide groove, and the main shift lever is biased toward the recess, so that the main shift lever is locked in the neutral position. Therefore, even if the operator accidentally contacts the main gear shift lever, there is no fear that the gear shift lever will move to another gear shift position, and there is an effect that sudden start etc. can be prevented.
Furthermore, when the main gear shift lever is removed from each shift position of the guide groove, the pressing spring biases it outward in the direction of the engagement recess at the neutral position, thereby preventing it from mating to other shift positions. It is possible to prevent errors, eliminate erroneous operations, and improve operational safety.

[Brief explanation of the drawing]

FIG. 1 is an overall side view of an embodiment of the present invention. FIG. 2 is a plan view of the speed change nameplate. FIG. 3 is a partially cutaway rear view of the main shift operating mechanism. A: Agricultural tractor, 8: Speed change nameplate, 9: Guide groove, 10: Main speed change lever, 10': Guide groove insertion part, 11: Mission case, N: Neutral position, 12: Engagement recess, 14: Sliding Shaft, 16: Pin mounting pipe, 16': Shift block engagement pin, 1
7, 18: Shift block, 17', 18': Shift fork, 22: Pressing spring.

Claims (1)

[Scope of Claim for Utility Model Registration] A main transmission configured to perform a transmission operation by moving a main transmission lever 10 along a guide groove 9 of a transmission nameplate 8 provided on the side of a driving section 6 of a tractor A. In the operating mechanism, the guide groove 9 is formed into a substantially H-shape in plan view, and the engagement recess 12 for the main shift lever 10 is formed outside the neutral setting position in the center, and the main shift lever 10 and the engagement recess 12 are formed outside the central neutral setting position. Mission case 11
A conical pressing spring 22 is attached to a sliding shaft 14 which is interlocked and can swing from side to side, and biases the lever 10 outward toward the engagement recess 12. Safety lock mechanism for main gear shift lever.