JPS621478Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a forward/reverse switching device for a rotary device, which increases the transmission torque during power transmission, and
The purpose is to downsize the entire transmission case.

In side drive type, center drive type, etc. rotary devices, when changing from down cut to up cut, it is necessary to switch the rotation direction of the pawl shaft. Therefore, for example, in the side drive type, a drive bevel pinion is fitted in the input transmission case at the center of the upper part of the rotary machine frame, and the drive bevel pinion is engaged with the drive bevel pinion from both sides and is freely rotatably fitted on the transmission shaft. A bevel gear mechanism including first and second bevel gears which are connected to each other and a shifter that selectively connects both bevel gears to a transmission shaft is incorporated, and by selective operation of the shifter, the pawl shaft is rotated forward and backward through the transmission shaft. There is something. However, in both forward and reverse rotations, the bevel gears that transmit the power simply replace each other, and the power is always transmitted through one bevel gear, while the other bevel gear is in an idle state. Because there is
The load on the bevel gear on the power transmission side is extremely large, and therefore there is a natural limit to the transmission torque.
It was not possible to increase the transmitted torque without increasing the size. In addition, conventionally, the shift fork used to operate the shifter had an integrated forked shape, and was fixed by fitting onto the operating shaft at the base of the forked part, so the dimension from the transmission shaft to the operating shaft was This has the disadvantage that the gear case becomes larger as a whole.

The present invention is designed to solve these conventional problems, and its features include a drive bevel pinion inside the transmission case, and a mechanism that engages the drive bevel pinion from both left and right sides. The bevel gear mechanism includes a pair of left and right first and second bevel gears that are freely rotatably fitted onto the transmission shaft, and a shifter that selectively connects both of the bevel gears to the transmission shaft. In a forward/reverse switching device for a rotary device in which a pawl shaft is driven in the forward and reverse directions through The body 27 is attached to the transmission case from the front side, and a relay bevel pinion that engages a pair of bevel pinions on the side opposite to the drive bevel pinion is provided on the transmission case side, and a vertical direction passing between the bevel gear mechanism and the relay bevel pinion is provided on the transmission case side. The operating shaft is provided in the transmission case, and a pair of engaging bodies that engage with the shifter from both upper and lower sides are separately provided on the operating shaft and spaced apart in the axial direction of the operating shaft.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. Fig. 1 shows a schematic structure of a side drive type rotary device. In the figure, 1 is a rotary machine frame, an input gear case 2, and a pair of left and right supports. Arm 3, chain case 4, side frame 5
Consists of etc. A claw shaft 6 has a large number of tilling claws 7, and is rotatably supported between the lower ends of the chain case 4 and the side frame 5. 8 is a rotary cover.

The gear case 2 is arranged in the upper center of the rotary machine frame 1, and inside this gear case 2 there is a second
As shown in the drawings and FIG. 3, a bevel gear mechanism 9 for forward/reverse switching is incorporated. 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 both bevel gears 11 and 12 on the opposite side of the drive bevel pinion 10. Interlocking relay bevel pinion 13
and a shifter 15 for selectively coupling the bevel gears 11 and 12 to the transmission shaft 14. The transmission shaft 14 is mounted in the support arm 3 on the chain case 4 side of the rotary machine frame 1, spanning the gear case 2 and the chain case 4, and is connected to the pawl shaft via the chain transmission mechanism in the chain case 4. 6
is linked to. Drive bevel pinion 10
is integrally formed at the inner end of the input shaft 16, and the input shaft 16 is supported in the front-rear direction by bearings 17, 18 and a bearing case 19, and the bearing case 1
9, and a universal joint shaft that interlocks with the PTO shaft of the tractor can be connected to its front end. The bevel gears 11 and 12 have female spline-shaped engagement parts 23 and 24 on the inner peripheral surfaces of the boss parts 21 and 22, respectively.
12 is rotatably supported by a pair of left and right bearing holding parts 28 and 29 integrally formed on the support body 27 via boss parts 21 and 22 and bearings 25 and 26, and a shifter slide is connected to the transmission shaft 14. It is fitted in a mantle so that it can rotate freely in a moving space. The shifter 15 has a circumferential groove 30 in the center in the axial direction, and has male spline-shaped engagement parts 31 and 32 on both sides of the circumferential groove 30.
It is slidably spline-fitted to the transmission shaft 14 so as to selectively engage and disengage from the occlusal portions 23 and 24 of 1 and 12 from the inner peripheral side. The support body 27 includes a pair of bearing holding parts 28 and 29 as well as a mounting flange part 3.
The bearing case 19 is attached to the front surface of the mounting flange 33 by bolts 35 so as to close the front opening of the gear case 2 through the mounting flange 33. It is installed accordingly. The bevel gear mechanism 9 supported by the support body 27 can be freely inserted and removed from the front opening of the gear case 2. The relay bevel pinion 13 is integrally formed with the bevel pinion shaft 36. The bevel pinion shaft 36 is rotatably held via a bearing 38 in a bearing case 37 attached to the rear side of the gear case 2, and the bevel pinion shaft 36 is connected to the bearing case 37 and the bearing cover 39.
A power take-off shaft 40 that protrudes further rearward is screwed and fastened. Relay bevel pinion 36 and transmission shaft 14
An operating shaft 41 is disposed vertically between the gear case 2 and the upper shaft. It is made to protrude upward from the bearing part 42. A pair of engaging bodies 44 and 45 are separately attached to the operating shaft 41 inside the gear case 2, and an operating plate 46 is fixed to the upper end outside the gear case 2. Engagement bodies 44, 4
5 is a round bar bent into an L shape, and bosses 47, 48 and roll pins 49, 50 are arranged so that the bent end engages the circumferential groove 30 of the shifter 15 from above and below. is fixed to the operating shaft 41 by. Bosses 47 and 48 are relay bevel pinions 13
The relay bevel pinion 13 and the shifter 15 are spaced apart from each other in the vertical direction so as not to interfere with the shifter 15, and the distance between the relay bevel pinion 13 and the shifter 15 is the minimum necessary to allow the small diameter operating shaft 41 to pass through. The operation plate 46 has two through holes 51, 5 as shown in FIG.
2 is formed, and by inserting a bolt 53 into either one of the through holes 51, 52 and screwing it into the female screw body 54 on the gear case 2 side, the shifter 15 is engaged with one of the bevel gears 11, 12. It can be fixed in a fixed position.

In the above configuration, during normal downcut cultivation, the shifter 15 is engaged with the second bevel gear 12 side as shown in FIG. and rotates the transmission shaft 14 in the normal rotation direction (arrow a). In this case, the input shaft 16
The power is transmitted through a transmission path from the driving bevel pinion 10 to the second bevel gear 12 and the shifter 15, and from the driving bevel pinion 10 to the first bevel gear 11, the relay bevel pinion 13, the second bevel gear 12, and the shifter 15. Since the power is transmitted to the power transmission shaft 14 through two routes, the transmitted torque is larger than when power is transmitted through only one route, and power transmission of large horsepower is possible. Furthermore, since the bevel gears 11 and 12 rotate in opposite directions, the power transmission is well balanced and vibrations can be reduced. Note that when the transmission shaft 14 rotates in the forward 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 tilling claws 7 are mounted facing in the opposite direction, the shifter 15 is engaged with the first bevel gear 11, and the first bevel gear 11 is coupled to the transmission shaft 14. In this case, when the operation plate 46 is rotated in the direction of the arrow c, the shifter 15 slides toward the first bevel gear 10 via the operation shaft 41 and the engaging bodies 44 and 45.
Since this first bevel gear 10 is coupled to the transmission shaft 14, the bolt 53 is inserted into the through hole 51 and screwed into the female screw body 54 to fix the operation plate 46. Then, the power from the input shaft 16 is transmitted to the transmission shaft 14 via the drive bevel pinion 10, the first bevel gear 11, and the shifter 15, and is also transmitted to the drive bevel pinion 10, the second bevel gear 12, the relay bevel pinion 13, and the first bevel pinion. Since it is transmitted to the power transmission shaft 14 through the bevel gear 11 and shifter 15, the power transmission shaft 14 and the pawl shaft 6 rotate in the opposite direction to the direction during downcutting described above, and it is possible to till by the upcutting method.

In both down cut and up cut,
The relay bevel pinion 13 always rotates in the same direction, and regardless of the tilling method, power can be extracted from the power output shaft 40 to drive other working machines at the same time as the tilling work.

If power extraction is not required, the power extraction shaft 40 may be removed and a cap may be attached to the bearing cover 39, or the bearing cover 39 itself may be configured as a blind cover and the bevel pinion shaft 36 may be The ends may be completely closed. Further, the relay bevel pinion 13 can be fitted around a fixed shaft so as to be freely rotatable. It can also be adopted in a center drive type rotary device.

In this invention, a relay bevel pinion is provided that engages a pair of bevel gears on the opposite side of the drive bevel pinion, so power is transmitted to the transmission shaft through two paths in both forward and reverse rotations. , sufficient transmission torque can be ensured.
In addition, since the pair of bevel gears transmit power while rotating in opposite directions, it is possible to reduce vibrations and the noise that accompanies them. Moreover, since the pair of engaging bodies that engage with the shifter are separately provided and spaced apart from each other in the axial direction of the operating shaft, the distance between the bevel gear mechanism and the relay bevel pinion can be reduced, and the transmission case It is possible to downsize the entire device accordingly. Furthermore, the bevel gear mechanism is supported on the support body, and the support body is attached to the transmission case from the front side so that the bevel gear mechanism can be inserted and removed from the front opening of the transmission case. After assembly, it can be placed inside the transmission case. Moreover, the operating shaft is located between the bevel gear mechanism and the relay bevel pinion, and the pair of engaging bodies provided on this operating shaft engages the shifter from both the upper and lower sides. Even if the bevel gear mechanism remains attached to the side, the operating shaft and the engaging body do not become an obstacle when inserting or removing the bevel gear mechanism into or from the transmission case.
Decomposition can be carried out easily.

[Brief explanation of the drawing]

The drawings illustrate one embodiment of the present invention, in which Fig. 1 is a schematic rear view showing the overall configuration, Fig. 2 is a cross-sectional plan view of the main part, and Fig. 3 is a view taken in the direction of - arrow in Fig. 2. The sectional view and FIG. 4 are plan views of the switching operation section. DESCRIPTION OF SYMBOLS 1...Rotary machine frame, 2...Gear case (transmission case), 6...Claw shaft, 9...Bevel gear mechanism, 10...Drive bevel pinion, 11, 12...
...Bevel gear, 13...Relay bevel pinion,
14... Transmission shaft, 15... Shifter, 16... Input shaft, 27... Support body, 41... Operation shaft, 44, 4
5... Engagement body.

Claims (1)

[Scope of utility model registration request] A drive bevel pinion 10 is disposed within the transmission case 2.
and a pair of left and right first and second bevel gears 11 that engage the drive bevel pinion 10 from both left and right sides and are fitted on the transmission shaft 14 so as to freely rotate.
12, and a shifter 15 for selectively coupling both bevel gears 11, 12 to a transmission shaft 14, the bevel gear mechanism 9 drives the pawl shaft 6 in the forward and reverse directions via the transmission shaft 14. In a forward/reverse switching device for a rotary device, a bevel gear mechanism 9 is supported on a support 27, and the support 27 is attached to the front side of the transmission case 2 so that the bevel gear mechanism 9 can be inserted and removed from the front opening of the transmission case 2. and a pair of bevel pinions 1 on the opposite side to the drive bevel pinion 10.
1 and 12 is provided on the transmission case 2 side, and a vertical operation shaft 41 passing between the bevel gear mechanism 9 and the relay bevel pinion 13 is provided on the transmission case 2.
A forward/reverse switching device for a rotary device, characterized in that a pair of engaging bodies 44, 45 that engage with the shifter 15 from both upper and lower sides are provided separately and spaced apart in the axial direction of the operating shaft.