JPS6225560Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a transmission device for a rotary tiller that is capable of forward and reverse rotation.

(Prior Art) A technique for transmitting the rotation of an input shaft in forward and reverse directions to an interlocking shaft perpendicular to the input shaft is disclosed in Japanese Patent Application Laid-open No. 19681/1981. This conventional technology includes a bevel pinion of an input shaft, and a pair of left and right bevel gears for forward and reverse rotation that mesh with the bevel pinion from both left and right sides and are fitted on the interlocking shaft so as to freely rotate. In order to selectively connect both bevel gears to the interlocking shaft, a spline-fitted actuating member is arranged on the interlocking shaft, a supporting bearing is fitted around the outer periphery of the boss portion of the bevel gear, and the actuating member is attached to the opposite end surface. A meshing portion is formed that meshes with the shaft.

(Problems to be Solved by the Invention) In the above-mentioned prior art, the bearing, the meshing part, and the transmission position from the operating member to the interlocking shaft are separated in the axial direction of the interlocking shaft, and the bevel gear tilts when the operating member engages. Moreover, the width between the left and right bearings is extremely wide, making it difficult to apply to a rotary tiller.

(Means for solving the problem) The present invention allows the boss portions 14a, 15a of the pair of left and right bevel gears 14, 15 to be fitted onto the interlocking shaft 12 with a space therebetween, so that the actuating member 28 can be freely engaged with the internal fitting. Bearings 16 and 17 fitted onto boss portions 14a and 15a
The problems of the prior art described above are solved by making the engaging parts 25, 26 for the actuating member 28 of the boss parts 14a, 15a, and the transmission position of the actuating member 28 and the interlocking shaft 12 substantially the same in the axial direction. It has been made possible.

That is, the specific configuration of the problem-solving means in the present invention is such that the bevel pinion 18 of the input shaft 4 is provided in the transmission case 2, and the bevel pinion 18 is engaged with the bevel pinion 18 from both left and right sides and is free-rotating on the interlocking shaft 12. A pair of left and right bevel gears 1 for forward and reverse rotation that are freely fitted
4, 15 and both bevel gears 14, 15 are connected to the interlocking shaft 1.
A spline-fitted actuating member 28 is disposed on the interlocking shaft 12 for selective coupling to the interlocking shaft 12.
In the transmission device for a rotary cultivator in which the pawl shaft can be driven forward and backward through the boss portions 14a of both bevel gears 14 and 15,
15a has protrusions 14b and 15b that are fitted onto the interlocking shaft 12 with a space therebetween and protrude in opposing outward directions.A bearing 16 for supporting the transmission case 2 is provided on the outer periphery of the protrusions 14b and 15b. , 17 are fitted onto the outside, and meshing portions 25, 26 are formed on the inner peripheries of the bearings 16, 17, with which the actuating member 28 is fitted and engaged.

(Function) Actuating member 28 spline-fitted to interlocking shaft 12
When the actuating member 28 is slid in one direction from the neutral position and fitted into the inner periphery of the boss portion 14a of one of the bevel gears 14, the outer periphery of the actuating member 28 engages with the engaging portion 25 formed on the inner periphery of the protruding portion 14b of the boss portion 14a. input shaft 4.
The rotation is transmitted to the interlocking shaft 12 via the bevel pinion 18, the bevel gear 14, and the actuating member 28.
At this time, the position of engagement between the bearing 16 supporting the bevel gear 14 with respect to the transmission case 2, the meshing portion 25 and the operating member 28, and the transmission position from the operating member 28 to the interlocking shaft 12 are as follows. The bearings 16 and 16 are located at approximately the same position in the axial direction, and power is transmitted on the radially inner side of the bearing 16.

Hereinafter, embodiments of the present invention will be explained according to the drawings.
The transmission device 1 for a rotary tiller includes a transmission case 2 that is cylindrical in the lateral direction of the axis, and a pair of left and right frame members that extend downward from both ends of the transmission case 2 and support a rotary tiller section (not shown) at the lower end of the transmission case 2. 3, a transmission member 5 that transmits power from an input shaft 4 contained in the transmission case 2 and connected to the PTO shaft of the tractor by a universal joint shaft, etc. to the rotary tiller, and a transmission member disposed in parallel with the transmission member 5. It is mainly composed of a forward/reverse rotation operating member 7 for operating a forward/reverse rotation mechanism 6 of No. 5.

The input shaft 4 is supported by a first bearing bracket 9 via a first bearing 8 so as to be rotatable about the front and rear axis,
The first bearing bracket 9 is detachably attached to a support member 11 via bolts 10 and the like, and the support member 11 is detachably attached to the front surface of the transmission case 2.

Further, the input shaft end of the input shaft 4 projects forward from the first bearing bracket 9, and the input shaft end and
The gap between the first bearing bracket 9 and the first bearing bracket 9 is covered by a first bracket cover 9b which is removably attached to the first bearing bracket 9 with mounting bolts 9a.

On the protruding portion of the support member 11 into the transmission case 2, one end of the interlocking shaft 12, which is transverse to the axis and is included in the transmission case 2, is supported via a bearing 13. Opposing bevel shapes of the same size
Reverse gears 14 and 15 are supported via bearings 16 and 17, respectively, and a bevel input gear 18 of the input shaft 4 meshes with these forward and reverse gears 14 and 15 at the same time.

Further, an output shaft 22 having an output gear 19 that meshes with the forward and reverse gears 14 and 15 at the same time is provided, and the output shaft 22 is arranged on the four axes of the input shaft orthogonally intersecting the axis of the interlocking shaft 12. Both gears 14,
15 on opposite sides in the radial direction. and,
The output shaft 22 is supported by a second bearing bracket 21 via a second bearing 20, and the second bearing bracket 21 is detachably attached to the rear surface of the transmission case 2 via bolts 23 and the like. Further, the output shaft end of the output shaft 22 projects rearward from the second bearing bracket 21, and the gap between the output shaft end and the second bearing bracket 21 is such that it can be freely attached to and removed from the bracket 21 by a mounting bolt 21a. It is covered by an attached second bracket cover 21b. and,
In the above case, the input shaft 4 and the output shaft 22, the first and second bearing brackets 9, 21 that support them, and members related thereto, such as bearings and oil seals, are of the same shape and size, and are mutually exclusive. It is said that they can be exchanged freely. In the above case, when the output shaft 22 and the like are not used, the cover member 24 is removably attached using the attachment bolts 9a and 21a.

The inner holes of the forward and reverse gears 14 and 15 are spline holes 25 and 26, respectively, and the interlocking shaft 12 is loosely fitted into these spline holes 25 and 26. axis 12
A spline 27 is formed on the outer peripheral surface.

A cylindrical actuating member 28 is provided on the spline 27 of the interlocking shaft 12 to be slidably fitted in the axial direction,
On the outer peripheral surface of one end of the actuating member 28, the actuating member 2 is attached.
An outer circumferential spline 29 is formed that can be selectively engaged with and disengaged from both spline holes 25 and 26 by sliding in the axial direction of step 8, and an engaging circumferential groove 30 is formed on the outer circumferential surface of the other end of the actuating member 28. It is formed. That is, the boss portions 14a, 15a of both the bevel gears 14, 15 have protruding portions 14b, 15b that are fitted onto the interlocking shaft 12 with a space therebetween and protrude in opposing outward directions. Bearings 16 and 17 for supporting the transmission case 2 are fitted on the outer periphery, and the operating member 2 is fitted on the inner periphery of the bearings 16 and 17 on the radially inner side of the bearings 16 and 17.
a meshing portion 25 in which the splines 29 of No. 8 fit and mesh;
26 is formed.

The other end of the interlocking shaft 12 is supported by the end of the transmission case 2 and the frame member 3 on the same end side via a bearing 31, and the same end of the interlocking shaft 12 and the pawl shaft of the rotary tiller are connected in a chain. They are interlocked and connected by a transmission device 32 or the like.

The rotational drive of the input shaft 4 causes the forward and reverse gears 14 and 15 to simultaneously rotate, the auxiliary gear 19 to rotate, and the output shaft 22 to rotate.
The interlocking shaft 12 is stopped in normal or neutral position via the actuating member 28 that engages with either one of the reversing gears 14 and 15.
Alternatively, the input shaft 4 is rotated in the opposite direction, and power is transmitted from the input shaft 4 to the rotary tiller during forward and reverse rotation.
Each of these devices constitutes the transmission member 5, and the forward/reverse gears 14, 15 and the operating member 28 constitute the forward/reverse mechanism 6.

Forward/reverse operation member 7 for operating the forward/reverse mechanism 6
is near one side of the auxiliary gear 19, and the transmission case 2
A rotating shaft 33 is supported on the upper and lower surfaces of the rotary shaft 33 so as to be rotatable about the axis, and a C-shaped engagement member 34 is externally fitted on the rotating shaft 33 within the transmission case 2 and rotates together with the rotating shaft 33 about the axis.
and an operating lever 36 fixed with a spring pin 35 to the end of the rotating shaft 33 extending from the transmission case 2.
Both ends of the engagement member 34 are engaged with the engagement circumferential groove 30, and the actuation member 28 is slidable in the axial direction by rotation of the rotation shaft 33.

The operating lever 36 is provided with a positioning device 37, and the device 37 has a fan-shaped rotating plate 38 that rotates along with the rotating shaft 33. Engagement holes 39, 39, 39 for diversion, neutral, and reverse are sequentially spaced apart, and a ball body is provided on the upper surface of the transmission case 2 to elastically engage these engagement holes 39, 39, 39 in a detachable manner. 40 are provided. The ball body 40 is arranged in each engagement hole 39 in correspondence to each selective engagement position of the operating member 28 with respect to the forward and reverse gears 14 and 15, and a neutral position in which the operating member 28 does not engage with either of the gears 14 and 15. , 39, 39 are resiliently engaged.

In addition, by removing the second bearing bracket 21 from the transmission case 2, the input end 22 can be freely inserted and removed from the opening 41 of the transmission case 2 to which the bracket 21 is attached. In addition, transmission case 2
A second opening 42 is formed on the rear surface corresponding to the forward/reverse operating member 7, which allows the engaging member 34 etc. to be moved in and out, and facilitates maintenance and inspection of the forward/reverse operating member 7. The lid is removably attached via 44.

(Effect of the invention) According to the invention detailed above, the bevel gear 1
The bearing positions of the receiving shafts 16 and 17 of 4 and 15, the meshing position of the bevel gears 14 and 15 and the operating member 28, and the transmission position of the operating member 28 and the interlocking shaft 12 are substantially the same in the axial direction of the interlocking shaft 12. position, each member, especially the bevel gears 14 and 15, does not tilt, and the power transmission from the input shaft 4 to the interlocking shaft 12 can be ensured smoothly. Compared to a case where the actuating member 28 is arranged in the axial direction of the interlocking shaft, the gap between the bearings 16 and 17 can be narrowed or the width of the meshing parts 25 and 26 can be widened.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, FIG. 1 is a plan sectional view thereof, FIG. 2 is a sectional view taken along the - line in FIG. 1,
FIG. 3 is a sectional view taken along the - line in FIG. 1. 4... Input shaft, 12... Interlocking shaft, 14... Forward gear, 15... Reverse gear, 22... Output shaft, 28
...Operating parts.

Claims (1)

[Scope of Claim for Utility Model Registration] Inside the transmission case 2, there is a bevel pinion 18 of the input shaft 4, and left and right shafts that mesh with the bevel pinion 18 from both left and right sides and are fitted on the interlocking shaft 12 so as to be freely rotatable. A pair of forward/reverse bevel gears 14, 1
5 and an actuating member 28 spline-fitted onto the interlocking shaft 12 to selectively connect both bevel gears 14 and 15 to the interlocking shaft 12, so that the pawl shaft can be driven in the forward and reverse directions via the interlocking shaft 12. In the transmission device for a rotary tiller, the boss portions 14a of both the bevel gears 14 and 15,
15a has protrusions 14b and 15b that are fitted onto the interlocking shaft 12 with a space therebetween and protrude in opposing outward directions.A bearing 16 for supporting the transmission case 2 is provided on the outer periphery of the protrusions 14b and 15b. . .