JPS6230505Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a positioning device for a change lever for a transmission.

In a selective engagement type gear transmission device, if the gears are not completely engaged, not only will the transmission not be transmitted from the driving side to the driven side, but also repeated impact noises from the tooth surfaces of the gears will occur, reducing durability.

The present invention is a change lever neutral positioning device for a transmission device that selectively engages the gear in the transmission case in conjunction with the switching operation of the change lever pivotally supported on the fixed side. This solves the problem by making the gear automatically return to the neutral state when it is released, and there is a recess on either the change lever or the fixed side that is deeper than the surface of either of them. A gear neutral positioning recess is provided on the other side, a rolling element that engages and disengages from the recess, and a spring that biases the rolling element in the engaging direction. When the gear is changed from the neutral state to the engaged state, when the gear is in the neutral state, the rolling element and the recess are engaged, and when the gear is in the engaged state, the rolling element and the recess are disengaged, and the rolling element is engaged with the change lever. Alternatively, when the rolling element is brought into contact with either one of the surfaces of the fixed side and the center of the rolling element is located within the recess than the peripheral edge of the recess, the rolling element presses the inner surface of the recess due to the elastic force of the spring and changes. The lever is characterized in that it can swing back to the neutral position.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 3 show the basic configuration of an embodiment of the present invention in an operating state, and FIGS. 4 to 10 show a tractor-mounted rotary tiller as an application example of the present invention.

In FIGS. 1 to 3, reference numeral 1 denotes a change lever, which is pivotally supported via a pivot 5 on a base 4 fixed with bolts 3 to a transmission case 2 shown in FIGS. 6 to 8. 6 is a driving gear, 7 is a driven gear,
Both gears 6 and 7 are linked to the switching operation of the change lever 1 so that the state can be changed from the neutral state shown in FIG. 1 to the intermediate state (occlusal preparation position) shown in FIG. 2 to the occlusal state shown in FIG. 3. The configuration thereof will be explained from FIG. 6 onwards.

Reference numeral 8 denotes a neutral positioning recess, which is provided on the change lever 1 in this example, but may also be provided on the fixed side, that is, the base 4 side.

The other member corresponding to the recess 8, in this example, the base 4
A rolling element 9 shown as a ball that engages and disengages from the recess 8 is provided on the movement trajectory of the recess 8 centering on the pivot shaft 5, and the rolling element 9 is mounted in a spring housing cylinder 10 fixed to the base 4. is biased in the engagement direction via a coil spring 11 .

Figure 1 shows the neutral state of gears 6 and 7, where both gears are completely disengaged, and in this state spring 11
The rolling element 9, which is biased by , sinks into and engages the recess 8, and is positioned in a neutral state here.

FIG. 3 shows the engaged state of the gears 6 and 7, and in this state, the rolling element 9 and the recess 8 are in a disengaged state.

In FIG. 2, the center of the rolling element 9 is aligned with the concave periphery of the concave portion 8. In FIG. At this time, the gear 6 and the gear 7 are not completely engaged and are in an occlusal preparation state. When the center of the rolling element 9 is positioned further inside the recess 8 than the peripheral edge of the recess 8 from this occlusal preparation state, the rolling element 9 presses against the inner surface of the recess 8 due to the elastic force of the spring 11. , the change lever 1 automatically swings back to the neutral position. As a result, when the change lever 1 is swung to return to the neutral position, even if the operating force is released while the return to neutral is incomplete, the elastic force of the spring 11 will cause the change lever 1 to swing completely back to the neutral position. This allows the gears 6 and 7 to be returned to normal operation, thereby preventing noise generation and shortening of life due to collision between the gears 6 and 7.

In addition, when the gears 6 and 7 are in mesh, the rolling elements 9
is supposed to come into contact with the surface of the lever 1. As a result, the change lever 1 is not positioned at any position other than the neutral position, so it can be easily returned to the neutral position by the touch during operation.

A case where the present invention is applied to a switching device of a sliding rotary tiller will be explained with reference to FIGS. 4 to 10.

In FIG. 4, 12 is a tractor, and this tractor 12 has a rotary tilling device 13, a hydraulic device 14,
They are connected via a three-point link 15 so that they can move up and down.

The rotary tilling device 13 has a machine frame 16 and a tilling section 1.
7, a cover 18, a tail wheel device 19, etc., transmits power from the tractor PTO shaft to a bevel gear transmission body 20 in a transmission case 2 provided in the center of the machine frame 16 via a universal joint shaft 21, The tiller 17 can be driven via the transmission shaft 22, chain transmission body 23, and the like.

The tilling section 17 side is slidable in the transverse direction with respect to the transmission case 2. Therefore, a movable cylinder arm 25 is provided on the upper part of the pair of left and right support frames 24, and each of the cylinder arms 25 is attached to the transmission case 2. It is slidably fitted into fixed cylinder arms 26 provided on both sides,
The transmission shaft 22 is built into one movable cylindrical arm 25, and the screw feed shaft 27 is built into the other movable cylindrical arm 25.

The screw feed shaft 27 is connected to the switching device 2 inside the transmission case 2.
The change lever 1 is connectable to the transmission shaft 22 via the change lever 8, and is used to switch the switching device 28 between forward, reverse and neutral.

That is, the drive gear 6 is fixed to the transmission shaft 22, and has gear portions on the inner and outer peripheries in the application examples shown in FIG. 6 and below.
The driven gear 7 has two parts that engage with the inner periphery of the gear 6 and one that engages with the outer periphery thereof, and are rotatably provided on the dogleg-shaped swinging arm 29 via support shafts 30 and 31, respectively. The swing arm 29 is fixed to a fixed support shaft 32.

This fixed support shaft 32 is rotatable in the transmission case 2, and has a lever 33 outside the case.
Interlocking pin 3 showing the change lever 1 and 3 with a ball joint
It is linked with 4.

Further, two sets of large and small gears 35 and 36 are provided on the fixed support shaft 32 so as to freely rotate, and the two gears 7 are always engaged with the large gear 35, and the small gear 36 is It is always engaged with the gear 37 on the shaft 27.

Therefore, according to this application example, FIG. 7 is the neutral state, and neither of the driven gears 7 is engaged with the driving gear 6, and the neutral state that is the state shown in FIG. Retained.

Therefore, if the change lever 1 is operated in the direction shown by the arrow in FIG.
The rotating arm 29 is rotated in either direction shown in the figure or in FIG. 7, and the swinging arm 29 is swung in the same direction.

When the swinging arm 29 swings as shown in FIG.
gear 7 meshes with the inner periphery of gear 6, and in the case of FIG. 6 is rotating, the feed shaft 27 driven by the gear 37 via the double gears 35 and 36 is rotated in forward and reverse directions.
is slid to the left or right.

According to the present invention, when the gear is in the neutral state, the rolling element and the recess are engaged, and when the gear is in the engaged state, the rolling element and the recess are disengaged, and the rolling element is either on the change lever or the fixed side. is in contact with the surface of Therefore, the change lever is not positioned at any position other than the neutral position, and can be easily returned to the neutral position by the feel of the lever during operation. Furthermore, even if the lever operating force is released before the change lever has fully returned to the neutral position, the rolling elements press the inner surface of the recess with the elastic force of the spring, automatically returning the change lever to the neutral position. It is possible to return to rocking motion, reducing noise and shortened lifespan due to incomplete engagement of gears.

[Brief explanation of the drawing]

Figures 1 to 3 are explanatory diagrams showing the operation of the basic structure of the present invention, Figure 4 is a side view of the rotary to which the present invention is applied, Figure 5 is a sectional view of the same, and Figure 6 is the inside of the transmission mechanism. FIG. 7 is a detailed view of the applied part of the present invention, FIG. 8 is a side view of the same, and FIGS. 9 and 10 are explanatory views of the switching operation. DESCRIPTION OF SYMBOLS 1... Change lever, 5... Pivot, 6... Drive gear, 7... Driven gear, 8... Recess, 9... Drive body, 11... Spring, 12... Transmission case.

Claims (1)

[Scope of utility model registration request] In a transmission device that selectively engages the gears in the transmission case in conjunction with the switching operation of a change lever pivotally supported on the fixed side, either the change lever or the fixed side has a recessed surface than the surface of either one. A positioning recess for gear neutral is provided, a rolling element that engages and disengages from the recess is provided on the other side, and a spring is provided that biases the rolling element in the engaging direction, and the swinging of the change lever causes the gear to shift. is changed from a neutral state to an engaged state, and when the gear is in a neutral state, the rolling element and the recess are engaged, and when the gear is in the engaged state, the rolling element and the recess are disengaged, and the rolling element is engaged with the change lever or the recess. When the rolling element is in contact with one of the surfaces of the fixed side and the center of the rolling element is located within the recess than the peripheral edge of the recess, the rolling element presses the inner surface of the recess due to the elastic force of the spring, and the change lever is moved. A positioning device for a change lever for a transmission device, characterized in that the lever can swing back to a neutral position.