JPS6225773Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an operation limiting device for an operating lever.

For forward/reverse switching mechanisms in various transmission devices,
Many devices have been adopted in which an operating lever is provided to operate an operated member, such as a shifter, via a rotating shaft, and a ball stopper type mechanism is used to determine the switching position of the shifter. However, in this type of positioning mechanism, for example, an engaging recess is formed in a rotating plate fixed to a rotating shaft, corresponding to each switching position of the shifter, and a ball that can be freely fitted into and removably is inserted into the engaging recess by a spring. Since the shifter is also incorporated into the guide boss on the fixed side, if the ball goes over the engagement recess during operation, there is a risk that the shifter will become overshifted and normal switching will not be achieved.

The present invention is designed to reliably solve these conventional problems with an extremely simple structure. In a device in which a lever is provided and a guide boss of a positioning mechanism for positioning an operated member is provided on the fixed side, the operating lever is provided with a restriction hole corresponding to its operating range, and the guide boss is fitted into this restriction hole. At the point.

The invention will now be described in detail with reference to the illustrated embodiments. The drawings illustrate a side-drive rotary device for tractor mounting. 1 and 2, reference numeral 1 denotes an input gear case, and support arms 2 are integrally formed on both sides of this gear case 1. As shown in FIG. Reference numeral 3 denotes an input shaft, which is rotatably supported by a bearing case 6 via bearings 4 and 5, and this input shaft 3 can be connected to a PTO shaft of a tractor via a universal joint shaft at the front end side. A bevel pinion 7 is formed at the rear end. The bearing case 6 is attached to a support bracket 8 mounted on the front side of the gear case 1. The support bracket 8 includes a pair of left and right support portions 9 that protrude into the gear case 1.
10, and bearings 11,
Bevel gears 13 and 14 are rotatably held via 12. The bevel gears 13, 14 are engaged with the bevel pinion 7 of the input shaft 3 from both left and right sides, and a spline hole 15,
16 are formed respectively. Reference numeral 17 denotes a transmission shaft, which is inserted into one support arm 2 across the gear case 1 and chain case 18, and is connected to one support portion 9 of the support bracket 8 via a bearing 19.
It is supported by a bearing case 21 on the chain case 18 side via a bearing 20. Note that this transmission shaft 17 is equipped with a chain case 1.
A sprocket 22 is fixedly installed within the sprocket 8, and the pawl shaft can be driven via a chain suspended from the sprocket 22. The inner end of the transmission shaft 17 is loosely inserted into the bevel gears 13 and 14, and a shifter 23 for forward/reverse switching is spline-fitted to the inner end so as to be slidable in the axial direction. The shifter 23 has a spline portion 24 at one end that can be fitted into and removed from the spline holes 15 and 16 of each bevel gear 13 and 14, and a circumferential groove 25 at the other end. Reference numeral 26 denotes a pair of engaging members that engage with the circumferential groove 25 of the shifter 23, and are fixed to a boss 27, and the boss 27 is fitted and fixed to a vertical rotation shaft 28. The rotation shaft 28 is supported by a pair of upper and lower bearing bodies 29 and 30 fixed to the gear case 1 so as to be rotatable around a vertical axis. Reference numeral 31 denotes a positioning mechanism for the shifter 23, which includes a fan-shaped rotating plate 37 that has recesses 34, 35, and 36 corresponding to the neutral, normal, and reverse positions of the shifter 23 and is fixed to the boss 27, and a spring 38. is urged toward the rotating plate 37 and the recess 3
4, 35, and 36, and the ball 39 and the spring 38 are held by a guide boss 40 provided vertically through the upper wall of the gear case 1. There is. The guide boss 40 projects slightly upward from the upper wall of the gear case 1, and a bolt 41 for adjusting spring pressure is screwed into the upper end of the guide boss 40.
Reference numeral 42 denotes an operating lever for switching between forward and reverse directions, and is fixed to the upper end of the rotating shaft 28 via a boss portion 43. The operating lever 42 has a wide portion 44 on the base side, and a restriction hole 45 into which the upper end protrusion of the guide boss 40 fits is formed in the wide portion 44 . The restriction hole 45 is formed into a long hole shape corresponding to the operating range of the shifter 23 so as to allow the operation lever 42 to be switched between forward and reverse directions. Reference numeral 46 denotes a power take-off shaft, which is rotatably supported by a bearing case 49 via bearings 47 and 48.
are arranged on the same axis as the input shaft 3 and on opposite sides in the front and rear. The power take-off shaft 46 has a bevel pinion 50, and the bevel pinion 50 is connected to the bevel gear 1.
3 and 14 are interlocked. A protective cover 51 is removably attached to cover the power extraction shaft 46 when there is no need to extract power from it.

Next, the effect will be explained. The drawing shows the state when the operating lever 42 is located at the neutral position N, and at this time the spline portion 24 of the shifter 23 is not fitted into either of the bevel gears 13, 14. Therefore, for example, when plowing is performed by the downcut method by rotating the claw shaft in the normal direction, the operating lever 42 is rotated from the neutral position N to the normal rotation position A around the rotation shaft 28 in the direction indicated by the arrow a. Then, the shifter 23 slides in the direction of arrow b via the engagement member 26, and the spline portion 2
4 fits into the spline hole 15 of the bevel gear 13, the power from the input shaft 3 is transmitted to the transmission shaft 17 via the bevel pinion 7, the bevel gear 13, and the shifter 14, thereby causing the pawl shaft to rotate. It is driven in forward rotation. During this operation, the rotating plate 37 integrally rotates in the direction of arrow a via the rotating shaft 28, so the ball 39 separates from the recess 34 and fits into the recess 35, moving the shifter 23 to the normal rotation position. However, when the operating force of the operating lever 42 is very large and the ball 39 climbs over the recess 35, the edge of the restriction hole 45 engages with the guide boss 40, preventing the operating lever 42 from rotating. limit movement. Therefore, there is no problem such as overshifting of the shifter 23. Furthermore, since the control lever 42 has a restriction hole 45 and the guide boss 40 is fitted into the restriction hole 45, there is no need to separately provide a stopper or the like, which is simple.

At the time of reverse rotation, the operation lever 42 may be operated to the reverse rotation position B.

In addition, although the rotary device was illustrated in the embodiment, the present invention is not limited to this, and other devices may also be used. Further, the operated members, such as a shift gear, can be changed in various ways depending on the purpose.

In this invention, the control lever is provided with a restriction hole and the guide boss of the positioning mechanism is fitted into this hole, so the operating range of the control lever can be reliably limited without the need for a separate stopper, and the structure is simple. Easy and inexpensive to implement.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a plan sectional view, FIG. 2 is a view taken in the direction of the - arrow in FIG. 1, FIG. FIG. 3...Input shaft, 13,14...Bevel gear,
17... Transmission shaft, 23... Shifter, 26... Engaging member, 28... Rotating shaft, 31... Positioning mechanism, 40... Guide boss, 42... Operation lever,
45...Restriction hole.

Claims (1)

[Scope of utility model registration request] A control lever for operating an operated member via a rotating shaft is provided, and a guide boss of a positioning mechanism for positioning the operated member is provided on the fixed side,
An operation limiting device for an operating lever, characterized in that the operating lever is provided with a limiting hole corresponding to its operating range, and the guide boss is fitted into the limiting hole.