JPH0453202Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a forward/reverse switching device used in a rotary device capable of up-cutting and down-cutting.

(Prior Art) A drive bevel pinion, first and second bevel gears that mesh with the drive bevel pinion from both sides and are fitted on a transmission shaft so as to freely rotate, and both bevel gears are disposed in a transmission case. A forward/reverse switching device for a rotary device is disclosed in Japanese Utility Model Application Publication No. 58-45448, which is equipped with a bevel gear mechanism including a shifter selectively coupled to a transmission shaft, and drives a pawl shaft in the forward and reverse directions via the transmission shaft from the bevel gear mechanism. Publication No. 1 (Conventional Example 1), Utility Model Application No. 58-97338 (Conventional Example 2), Utility Model Application No. 58-97338 (Conventional Example 2)
97339 (conventional example 3), etc.

(Problems to be solved by the invention) By the way, in both conventional examples 2 and 3, the operating arm of the shifter that selectively connects the bevel gear to the transmission shaft is located on the extension of the axis of the transmission shaft, which is the so-called lateral operation. Because of this, there is a problem in terms of smoothness of operation.

In this regard, in conventional example 1, the shifter is located on the transmission shaft between the bevel gears, and the shifter is operated by a fork inserted between the bevel gears, so it is easier to operate than conventional examples 2 and 3. This is advantageous in terms of smoothness.

However, since the support shaft that supports the fork is not supported by the support part of the transmission case but by the case part, assembly may be difficult and the precision may be relatively poor. There was a problem.

In particular, the present invention aims to eliminate the disadvantages of Conventional Example 1 while ensuring its usefulness.

(Means for solving the problem) In the present invention, the transmission case 2 located at the upper center is
It consists of a case part 2 having an opening part 2B on the front side and a support part 27 that is inserted and removably inserted into the opening part 2B of the case part 2. bevel gear 11,
12 is rotatably supported around a common axis, and a bevel pinion 10 that engages with each of the bevel gears 11 and 12 is supported on the support portion 27 side of the transmission case 2. A transmission shaft 13 interlocked with the pawl shaft 6 is inserted on each axis so as to freely rotate with respect to each bevel gear 11, 12.
A pair of bevel gears 1 are slidably disposed above and between the bevel gears 11 and 12 in the axial direction of the transmission shaft 13.
Shifter 14 selectively connects 1 and 12 to the transmission shaft 13
An operation support shaft 38 that rotates around an axis in the front-rear direction parallel to the rotation axis of the bevel pinion 10 is provided on the support portion 27 side of the transmission case 2, and the operation support shaft 38 is provided on the support portion 27 side of the transmission case 2. The shaft 38 has a lever portion 39 that engages with the shifter 14 inside the transmission case 2, and is equipped with an operation portion 40 for operating the operation support shaft 38 outside the transmission case 2. This is a forward/reverse switching device for a rotary device.

(Function) When the bevel pinion 10 is driven, the pair of bevel gears 11 and 12 are rotated.

When the shifter 14 on the transmission shaft 13 is connected to one of the bevel gears 12, the torque of the bevel gear 11 is transmitted to the transmission shaft 13 via the shifter 14, and the pawl shaft 6 is rotated.

When the shifter 14 is coupled to the other bevel gear 12, the transmission shaft 13 is rotated in the opposite direction, and the pawl shaft 6 is also rotated in the opposite direction.

The above switching operation of the shifter 14 is performed by the transmission case 2.
This is done by operating the operating section 40 around the operating shaft 38 outside.

(Example) Fig. 9 shows a schematic structure of a side drive type rotary device. In the figure, 1 is a rotary machine frame, an input transmission case 2, a pair of left and right support arms 3, a chain case 4, a side frame 5 Consists of etc. 6 is a claw shaft, which has a large number of tilling claws 7;
It is rotatably supported between the lower ends of the chain case 4 and the side frame 5. 8 is a rotary cover.

The transmission case 2 is disposed at the center of the upper part of the rotary machine frame 1, and a bevel gear mechanism 9 for forward/reverse switching is incorporated in the transmission case 2, as shown in FIGS. 1 and 2. That is, the bevel gear mechanism 9 includes a drive bevel pinion 10, first and second bevel gears 11 and 12 that engage with the drive bevel pinion 10 from both left and right sides, and a bevel gear 1.
1 and 12 to the transmission shaft 13. The transmission shaft 13 is attached to the support arm 3 on the chain case 4 side of the rotary machine frame 1.
The shaft is mounted within the transmission case 2 and the chain case 4, and is operatively connected to the pawl shaft 6 via the chain transmission mechanism 15 inside the chain case 4. The drive bevel pinion 10 is integrally formed on the inner end of the input shaft 16, and the input shaft 16 is connected to the bearing 1.
7, 18 and a bearing case 19, and projects forward from the bearing case 19, with a tractor attached to its front end.
A universal joint shaft that interlocks with the PTO shaft can be connected.
The bevel gears 11, 12 have boss parts 21, 22 formed at their centers of rotation, and female spline-shaped engagement parts 23, 24 on the inner peripheral surfaces thereof, respectively. 25, 26
It is rotatably supported by a pair of left and right bearing holding parts 28 and 29 integrally formed with the support part 27 via the support part 27 . Here, the transmission case 2 has a case portion 2 having an opening 2B in the front (front surface) thereof.
A and a support portion 27 that is removably inserted into the opening 2B, and has a bevel gear mechanism 9 therein.

Further, it is fitted around the transmission shaft 13 such that it can rotate freely relative to the shifter sliding space. Shifter 14
has a circumferential groove 30 in the central part in the axial direction, and
Male spline-shaped occlusal parts 31 and 32 on both sides
, and each of the engaging portions 31 and 32 is connected to the bevel gear 1.
The transmission shaft 13 is slidably spline-fitted to the transmission shaft 13 so as to selectively engage and disengage the engagement portions 23 and 24 of the transmission shaft 1 and 12 from the inner peripheral side. The support part 27 integrally has a mounting flange part 33 in addition to the pair of bearing holding parts 28 and 29, and a bolt is inserted through the mounting flange part 33 so as to close the front opening 2B of the case part 2A in the transmission case 2. 34, and a bearing case 19 is attached to the front surface of this mounting flange portion 33 with bolts 35. Furthermore, the bearing holding portion 2 in the support portion 27
8 has a hole 28A that can support the transmission shaft 13, and the shifter 14 on the transmission shaft 13 is positioned as shown in FIG. a neutral position of
Each position engaged with either bevel gear 11 or 12 can be held.

In addition, the support portion 27 includes a bevel pinion 10.
An operating support shaft 38 parallel to the axis of rotation of the input shaft 16, that is, the axis of the input shaft 16, is inserted and supported rotatably around the axis in the front-rear direction.
It has a lever part 39 that engages with the circumferential groove 30 of the shifter 14 at its inner end, and an operating part 40 is attached to its outer end. It is extending.

In addition, in Figures 1, 4 to 6,
The chain case 4 connects the outer end of the transmission shaft 13 to the bearing 4.
Inner case 4A for receiving with 1 and peripheral edge 4C
It consists of an outer case 4B to which is welded.

The inner and outer cases 4A and 4B are both made of sheet metal, and the thrust-stopping warps 43 and 44 of the bearing 41 for the transmission shaft 13 and the bearing 42 for the pawl shaft 6 are curved around the entire circumference of the bearings 41 and 42, but not around the entire circumference. A cast bearing case 45 is fixed to the lower part of the inner case 4A with bolts 46.

This bearing case 45 supports the end shaft 6A of the claw shaft 6 with the bearing 42, and has an annular projection 45A surrounding the flange portion 6B, and 45B is a rib;
5C indicates a bolt hole.

In the above configuration, during normal downcut cultivation, the shifter 14 is slid in the direction of arrow A shown in FIG. to the transmission shaft 13 through the transmission shaft 13.
Rotate in the normal rotation direction (arrow a). Transmission shaft 13
When it rotates in the normal rotation direction, the claw shaft 6 rotates in the direction indicated by the arrow b in FIG. 1, and the tilling claws 7 downcut till the field.

When cultivating a hard field, the tiller claws 7 are attached facing in the opposite direction, and the shifter 14 is slid in the direction of arrow B in FIG. 1 to engage the first bevel gear 11. 1 bevel gear 1
1 is coupled to the transmission shaft 13. In this case, the power is transmitted to the power transmission shaft 13 via the first bevel gear 11 and the shifter 14, so the power transmission shaft 13 and the pawl shaft 6 rotate in the opposite direction to the direction during downcutting described above, making it possible to till by the upcutting method. .

The above switching operation can be performed by rotating the operating section 40 shown in FIG.
done through.

In addition, in the neutral state shown in FIG. 1, the transmission shaft 13
Since it is supported by the hole 28A, shaft wobbling is prevented.

Furthermore, in order to assemble the bevel gear mechanism 9, the pair of bevel gears 11 and 12 are held in the support part 27, and the operating shaft 38, the lever part 39, etc. are assembled to the support part 27, and these assemblies are attached to the case part. This is done by inserting it into the opening 2B of 2A and assembling the transmission shaft 13 from the side.

(Effect of the invention) In this invention, the transmission case 2 located at the upper center is
It consists of a case part 2 having an opening part 2B on the front side and a support part 27 that is inserted and removably inserted into the opening part 2B of the case part 2. bevel gear 11,
12 is rotatably supported around a common axis, and a bevel pinion 10 that engages with each of the bevel gears 11 and 12 is supported on the support portion 27 side of the transmission case 2. A transmission shaft 13 interlocked with the pawl shaft 6 is inserted on each axis so as to freely rotate with respect to each bevel gear 11, 12.
A pair of bevel gears 1 are slidably disposed above and between the bevel gears 11 and 12 in the axial direction of the transmission shaft 13.
Shifter 14 selectively connects 1 and 12 to the transmission shaft 13
An operation support shaft 38 that rotates around an axis in the front-rear direction parallel to the rotation axis of the bevel pinion 10 is provided on the support portion 27 side of the transmission case 2, and the operation support shaft 38 is provided on the support portion 27 side of the transmission case 2. The shaft 38 has a lever portion 39 that engages with the shifter 14 inside the transmission case 2, and is equipped with an operation portion 40 for operating the operation support shaft 38 outside the transmission case 2. Since this invention relates to a forward/reverse switching device for a rotary device, it has the following advantages.

Since the support shaft 38 of the lever portion 39 that slides the shifter 14 on the transmission shaft 13 is provided on the support portion 27 that supports the pair of bevel gears 11 and 12, assembly accuracy can be improved.

Moreover, since the operation support shaft 38 is parallel to the rotational axis of the bevel pinion 10 as an axis in the longitudinal direction, it can be assembled compactly, and the operation force for the shifter 14 is transferred to the bevel gears 11, 12.
It has the advantage that there is no problem even if it is carried out in between.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of the main part of the main part of the project in plan view, Figure 2 is a cross-sectional view taken along line XX of Figure 1, and Figure 3 is a cross-sectional view of Figure 1 Y.
- An explanatory front view along the Y arrow, FIG. 4 is an elevational sectional view of the lower part of the chain case, FIG. 5 is a front view of the bearing case, FIG. 6 is a sectional view taken along the line Z-Z in FIG. The figure is a rear view of the entire rotary device. 1...Rotary machine frame, 2...Transmission case, 2A
... Case part, 6 ... Pawl shaft, 9 ... Bevel gear mechanism, 10 ... Drive bevel pinion, 11, 12 ...
... Bevel gear, 13 ... Transmission shaft, 14 ... Shifter, 16 ... Input shaft, 27 ... Support part, 38
...Operation support shaft, 39...Lever section, 40...Operation section.

Claims (1)

[Claims for Utility Model Registration] The transmission case 2 located at the upper center of the case part 2 has an opening 2B on the front side, and the support part 27 is inserted into and detachably fixed into the opening 2B of the case part 2. A pair of left and right bevel gears 11 and 12 are rotatably supported around a common axis by a support portion 27 in the transmission case 2, and a bevel pinion 10 is engaged with each of the bevel gears 11 and 12. is supported on the support portion 27 side of the transmission case 2, and the bevel gears 11,
12, a transmission shaft 13 interlocked with the pawl shaft 6 is inserted so as to freely rotate with respect to each bevel gear 11, 12. A shifter 14 that selectively couples the pair of bevel gears 11 and 12 to the transmission shaft 13 by sliding in the axial direction of the transmission shaft 13 is provided between the transmission shafts 13 and 13 in the front-rear direction parallel to the rotational axis of the bevel pinion 10. An operation support shaft 38 that rotates around the axis of the transmission case 2 is provided on the support portion 27 side of the transmission case 2, and a lever portion 39 that engages with the shifter 14 inside the transmission case 2 is attached to the operation support shaft 38. A forward/reverse switching device for a rotary device, characterized in that it is equipped with an operating section 40 for operating an operating support shaft 38 outside the transmission case 2.