JPH0118916Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a forward/reverse switching device for a rotary device, which reduces the burden on the bevel gear, enables large horsepower power transmission, and reduces the overall size of the transmission shaft in the axial direction. The purpose is to make it possible to configure the operating means arbitrarily.

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, the bevel pinion of the input shaft is placed in the input transmission case at the center of the upper part of the rotary machine frame, and the bevel pinion is engaged with the bevel pinion from both sides and is freely rotatable on the transmission shaft. There is a device that incorporates a pair of fitted bevel gears and a shifter that selectively connects the pair of bevel gears to a transmission shaft, and by selectively operating the shifter, the pawl shaft can be rotated forward or backward through the transmission shaft. However, this means that in both forward and reverse rotations, the bevel gears that transmit the power just replace each other; power is always transmitted through one bevel gear, and the other bevel gear is in an idling state. Therefore, the load on the bevel gear on the power transmission side is very heavy, and therefore there is a natural limit to the transmission torque, and it has been impossible to increase the transmission torque unless the size is increased. Conventionally, a pair of bevel gears are rotatably supported by a transmission shaft, and engaging portions are formed on opposing end surfaces of the pair of bevel gears, and a shifter is fitted onto the transmission shaft so as to be slidable in the axial direction. Since engaging portions are formed at both ends of the transmission case and the engaging portions at these ends are engaged with and disengaged from each other, there is a drawback that the distance between the pair of bevel gears becomes large and the transmission case becomes large.

The present invention has been developed to solve these conventional problems, and its features include a bevel pinion of the input shaft inside the transmission case, and a structure that engages the bevel pinion from both sides. In addition, it includes a pair of bevel gears fitted on the transmission shaft so as to freely rotate, and a shifter for selectively coupling the pair of bevel gears to the transmission shaft, so that the pawl shaft can be driven in the forward and reverse directions via the transmission shaft. In a forward/reverse switching device for a rotary device, a pair of bevel gears 8 and 9 are supported in a transmission case 2 with a shifter sliding space provided relative to a transmission shaft 11.
The occlusal part 18, 1 is located on the shifter sliding space side of the inner peripheral surface of 9.
9 are respectively provided, and an engaging portion 25 that selectively engages and disengages from the inner peripheral side within the shifter sliding space is provided in the engaging portions 18 and 19 of the pair of bevel gears 8 and 9, and this engaging portion 2
A shifter 12 is spline-fitted onto the transmission shaft 11 so as to be slidable in the axial direction. An operating means 31 for slidingly operating the shifter 12 in the axial direction is disposed on the outer side in the axial direction than the one bevel gear 8, and a relay bevel pinion 10 that engages the pair of bevel gears 8 and 9 is provided. The main feature is that a relay bevel pinion is provided that meshes with a pair of bevel gears.

Hereinafter, the present invention will be described in detail with reference to the illustrated embodiment. The drawing shows an embodiment of a side drive type rotary device. In FIGS. 1 to 4, 1 is a rotary machine frame, an input gear case 2, a left and right It consists of a support arm 3, a chain case 4, a side frame, etc., and a claw shaft having a large number of tilling claws is rotatably supported between the lower ends of the chain case 4 and the side frame.

A gear case 2 is disposed at the upper part of the rotary machine frame 1, and a bevel gear mechanism 6 for forward/reverse switching is incorporated in the gear case 2. That is, the bevel gear mechanism 6 has a drive bevel pinion 7.
and first and second bevel gears 8 and 9 that engage with the drive bevel pinion 7 from both left and right sides;
a relay bevel pinion 10 that engages both bevel gears 8 and 9 on the opposite side of the drive bevel pinion 7;
The shifter 12 selectively connects the bevel gears 8 and 9 to the transmission shaft 11. Transmission shaft 11
is mounted on a shaft within 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 interlocked and connected to the pawl shaft via the chain transmission mechanism within the chain case 4. has been done. The drive bevel pinion 7 is connected to the input shaft 50
The input shaft 12 is supported in the longitudinal direction by bearings 13, 14 and a bearing case 15, and is projected forward from the bearing case 15.
A universal joint shaft that interlocks with the PTO shaft can be connected.
The bevel gears 8, 9 have female spline-shaped engagement parts 18, 19 on the inner peripheral surfaces of the boss parts 16, 17, respectively, which protrude outward in the axial direction. It is rotatably supported by a pair of left and right bearing holding parts 23 and 24 integrally formed on the support body 22 via bearings 20 and 21 fitted on the outer periphery, and a shifter sliding space is provided for the transmission shaft 11. It is fitted into the mantle so that it can rotate freely. The shifter 12 has a spline-like occlusal part 25,
It has a body part 12a which has a smaller diameter than this engaging part 25 and passes through the shifter sliding space of one bevel gear 8 in the axial direction, and each engaging part 25 is connected to the engaging parts 18 and 19 of bevel gears 8 and 9. On the other hand, it is slidably spline-fitted to the transmission shaft 11 so as to be selectively fitted and removed from the inner peripheral side within the shifter sliding space. Further, the shifter 12 penetrates the bevel gear 8 and projects outward in the axial direction, and a circumferential groove 26 is formed at the projecting end. The support body 22 integrally has a mounting flange part 27 in addition to the pair of bearing holding parts 23 and 24, and is mounted with bolts through the mounting flange part 27 so as to close the front opening of the gear case 2. Further, the bearing case 15 is attached to the front surface of the mounting flange portion 27 with bolts. The relay bevel pinion 10 is integrally formed with the bevel pinion shaft 28. The bevel pinion shaft 28 has a bearing 3 attached to a bearing case 29 attached to the rear side of the gear case 2 with bolts.
0 and is rotatably held. Reference numeral 31 denotes an operation means for slidingly operating the shifter 12, and is disposed further outward in the axial direction than one of the bevel gears 8. The operating means 31 includes a rotation shaft 32 supported on the upper and lower surfaces of the gear case 2 so as to be rotatable around the axis;
A C-shaped engagement member 33 is fitted onto the rotating shaft 32 inside the gear case 2 and rotates around the axis along with the rotating shaft 32, and a spring pin 34 is fixed to the protruding end of the rotating shaft 32 from the gear case 2. Both ends of the engaging member 33 engage with the circumferential groove 26, and the shifter 12 is slidable in the axial direction by rotation of the rotating shaft 32. The operating lever 35 is provided with a positioning device 36, and the positioning device 36 includes:
It has a fan-shaped rotary plate 37 that rotates along with the rotary shaft 32, and the rotary plate 37 has a rotation plate 37 for forward rotation in the circumferential direction of rotation,
Engagement holes 38, 39, and 40 for neutral and reverse rotation are sequentially spaced apart, and a ball body 41 is provided on the upper surface of the gear case 2 to resiliently engage these engagement holes 38, 39, and 40 in a detachable manner. It is being On the other hand, rotating plate 3
A retaining plate 42 is interposed between the stepped portion of the rotary shaft 32 and the rotary shaft 32, and prevents the rotary shaft 32 from coming off from the gear case 2.
Both ends of the punched plate 42 are fixed to the gear case 2 via spring washers and bolts 43. Further, in this case, when the rotating plate 37 is rotated left and right and its side surfaces abut against the left and right spring washer sides, respectively, the ball body 41 is inserted into the forward or reverse engagement holes 38, 40.
The structure is such that it snaps into engagement. An entry/exit hole 42 for inserting and removing the engaging member 33 and the like is provided on the rear surface of the gear case 2 in correspondence with the operating means 31, and is closed by a cover 43.

In the above configuration, during normal downcut cultivation, the shifter 12 is engaged with the first bevel gear 8 side, and the power from the input shaft 50 is transmitted to the transmission shaft 11 via the first bevel gear 8 and the shifter 12,
The transmission shaft 11 is rotated in the normal rotation direction (arrow a).
In this case, the power from the input shaft 50 is transmitted through a transmission path from the drive bevel pinion 7 to the first bevel gear 8 and the shifter 12, and from the drive bevel pinion 7 to the second bevel gear 9, the relay bevel pinion 10, and the first bevel gear. 8. Since the power is transmitted to the power transmission shaft 14 through two routes, including the transmission route via the shifter 12, the wall thickness of the bevel gears 8 and 9 can be made thinner than when power is transmitted through only one route. It can also withstand high torque, making it possible to transmit large horsepower while being small and lightweight. Furthermore, since the bevel gears 8 and 9 rotate in opposite directions, the power transmission is well balanced and vibrations can be reduced. Note that when the transmission shaft 11 rotates in the normal rotation direction, the claw shaft rotates in the normal rotation direction, and the tilling claws downcut till the field.

When cultivating a hard field, the tiller claws are installed facing in the reverse direction, and the shifter 12 is fitted into the second bevel gear 9 side and engaged.
This second bevel gear 9 is coupled to a transmission shaft 11. Then, the power from the input shaft 50 is transmitted to the transmission shaft 11 via the drive bevel pinion 7, the second bevel gear 9, and the shifter 12, and is also transmitted to the drive bevel pinion 7, the first bevel gear 8, the relay bevel pinion 10, and the second bevel pinion. Bevel gear 9, shifter 12
is transmitted to the transmission shaft 11 through the transmission shaft 1.
1. The claw shaft rotates in the opposite direction to that used for downcutting, allowing for upcutting.
In both down cut and up cut, the shifter 12 is connected to the boss portions 16 and 1 of the bevel gears 8 and 9.
The bevel gears 8 and 9 are fitted inside and engage with the inner periphery, and the outer peripheries of the boss portions 16 and 17 are held by bearings 20 and 21, so that tilting of the bevel gears 8 and 9 during power transmission can be prevented. , durability is improved. Moreover, since the shifter 12 is fitted inside the bevel gears 8 and 9 to be fitted into and removed from them, the gap between the bevel gears 8 and 9 can be reduced compared to a case where the shifter 12 is fitted in and out of the bevel gears 8 and 9 on the end face side in the axial direction. Therefore, the gear ratio between the bevel pinion 7 of the input shaft 50 and the bevel gears 8, 9 can be increased to increase the reduction ratio, and the size of the entire device in the axial direction can be made compact.

In the present invention, since a relay bevel pinion 10 is provided that meshes with the pair of bevel gears 8 and 9, the power from the input shaft 50 is transmitted through two paths to the transmission shaft 11 in both forward and reverse directions. As a result, the load on each bevel gear 8, 9 can be reduced, and a large horsepower can be transmitted while the bevel gears 8, 9 are made thinner and lighter. In addition, since the pair of bevel gears 8 and 9 in the power transmission state rotate in opposite directions, it is possible to reduce vibrations and noise caused by the vibrations. Furthermore, the pair of bevel gears 8 and 9 are connected to the transmission shaft 11.
The pair of bevel gears 8 and 9 are supported in the transmission case 2 with a shifter sliding space therebetween, and engagement portions 18 and 19 are respectively provided on the inner peripheral surfaces of the pair of bevel gears 8 and 9 on the shifter sliding space side. 9 occlusal part 1
8 and 19, the shifter 12 is spline-fitted onto the transmission shaft 11 so as to be slidable in the axial direction so that the engagement portion 25 of the shifter 12 can be selectively fitted and removed from the inner peripheral side within the shifter sliding space. Therefore, the distance between the pair of bevel gears 8 and 9 in the axial direction can be reduced compared to a case where the engaging portion of the shifter selectively engages and disengages from each bevel gear on the end face side in the axial direction. Therefore, since the bevel pinion 7 becomes smaller, the gear ratio between the bevel pinion 7 and the bevel gears 8 and 9 can be increased to increase the reduction ratio, and the entire device can be made smaller. In addition, a pair of bevel gears 8 and 9 are supported in the transmission case 2 with a shifter sliding space provided to the transmission shaft 11,
Since the body portion 12a of the shifter 12 has a smaller diameter than the engaging portion 25 and passes through the shifter sliding space of one bevel gear 8 in the axial direction, after the bevel gears 8, 9, etc. are assembled into the transmission case 2, The shifter 12 can be fitted onto the transmission shaft 11 through the shifter sliding space, making it easy to assemble the shifter 12. Also, an operating means 31 for operating the shifter 12
is located on the outer side in the axial direction than one of the bevel gears 8, and the shifter 12 is operated from the outer side, so the configuration of the operating means 31 can be changed arbitrarily without being restricted by the bevel gears 8, 9, etc. It is easy to design.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a plan sectional view thereof, FIG. 2 is a sectional view taken along the - line in FIG. 1, FIG. The figure is a cross-sectional view taken along the - line in FIG. 3. 1... Rotary machine frame, 2... Gear case (transmission case), 6... Bevel gear mechanism, 7... Drive bevel pinion, 8, 9... Bevel gear, 1
0... Relay bevel pinion, 11... Transmission shaft, 1
2...Shifter, 50...Input shaft, 22...Support, 31...Operation means.

Claims (1)

[Scope of utility model registration request] Inside the transmission case 2, a bevel pinion 7 of an input shaft 50, a pair of bevel gears 8 and 9 that engage with the bevel pinion 7 from both sides and are fitted on the transmission shaft 11 so as to freely rotate; A shifter 12 selectively connects the bevel gears 8 and 9 to the transmission shaft 11.
In a forward/reverse switching device for a rotary device, the pair of bevel gears 8 and 9 are connected to the transmission shaft 11 in a forward/reverse rotation switching device for a rotary device, which drives the pawl shaft in the forward and reverse directions via the transmission shaft 11.
The pair of bevel gears 8 and 9 are supported in the transmission case 2 with a shifter sliding space therebetween, and engagement portions 18 and 19 are respectively provided on the inner peripheral surfaces of the pair of bevel gears 8 and 9 on the shifter sliding space side. 9 occlusal part 1
8 and 19, an engaging part 25 that selectively engages and disengages from the inner peripheral side within the shifter sliding space, and a bevel gear 8 that has a smaller diameter than the engaging part 25 and penetrates the shifter sliding space of one bevel gear 8 in the axial direction. A shifter 12 having a body portion 12a is spline-fitted onto the transmission shaft 11 so as to be slidable in the axial direction, and an operating means 31 for slidingly operating the shifter 12 in the axial direction is provided with A forward/reverse switching device for a rotary device, characterized in that a relay bevel pinion 10 is disposed on the outer side in the axial direction and meshes with a pair of bevel gears 8 and 9.