JPH084805Y2 - Drive device for tilted pawl shaft in rotary tiller - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a center drive type rotary tiller equipped with an inclined pawl for mounting a residual tillage treatment pawl for plowing below a central transmission case. The present invention relates to a shaft driving device.

[Conventional technology]

Conventionally, in a center drive type rotary tiller, an inclined pawl shaft for mounting a residual tillage treatment pawl for plowing below the transmission case located at the center of the machine body is externally fitted to the tiller drive shaft. The tilting pawl shaft is interlocked with a cultivating drive shaft via a joint fitted to the cultivating drive shaft so as to rotate integrally with the cultivating drive shaft.

[Problems to be solved by the device]

By the way, in the above-mentioned conventional center drive type rotary tiller, in order to prevent the joint fitted on the tiller drive shaft from axially thrusting, the joints are sandwiched between the tiller drive shafts and C Pins are fitted, and a groove for fitting the C pin is cut on the cultivating drive shaft.

For this reason, in the tilling drive shaft that receives a large impact and load during the tilling work, the strength of the groove portion where the C pin is fitted is reduced, and the stress is concentrated in this groove portion to drive the tilling operation during the tilling operation. It causes the shaft to break.

In view of the problems of the conventional one, the present invention prevents thrust movement in the direction of the plowing drive axis of the joint that links the plowing drive shaft and the slanting claw shaft with the claw shaft cylinder and the slanting claw shaft mounted on the plowing drive shaft. Since the C pin is not used for fixing the joint, there is no need to cut a groove in the tilling drive shaft, and the force of the tilling drive shaft due to the stress concentration that tends to occur during the tilling work is eliminated. It is an object of the present invention to provide a drive device for an inclined pawl shaft in a rotary tiller, which can prevent breakage accidents.

[Means for solving the problem]

The present invention is configured as follows to achieve the object.

That is, on the transmission case side of the tillage drive shaft extended from the transmission case at the center to the left and right, the inclined pawl shaft for mounting the residual tillage treatment pawl for plowing the lower part of the transmission case is externally fitted, and In a center drive type rotary tiller equipped with a claw shaft cylinder for mounting a tiller claw on the outside of the tilting claw shaft of the tiller drive shaft, the above tiller drive shaft and the tilted claw shaft are externally fitted to the tiller drive shaft. The engaging teeth of the joint and the engaging teeth provided on the inclined claw shaft are engaged and interlocked, and the claw shaft cylinder side of the joint is supported by the claw shaft cylinder, and the inclined claw shaft side of the joint is inclined claw. It is characterized in that it is configured to be supported by the engaging teeth of the shaft and to prevent the thrust movement of the joint in the direction of the tilling drive shaft by the pawl shaft cylinder and the inclined pawl shaft.

[Action]

Therefore, according to the drive device for the inclined pawl shaft in the rotary cultivator according to the present invention, the cultivating drive shaft and the inclined pawl shaft are provided on the engaging teeth of the joint fitted onto the cultivating drive shaft and the inclined pawl shaft. The engaging teeth are engaged and interlocked. Since the claw shaft cylinder side of the joint is supported by the claw shaft cylinder and the inclined claw shaft side is supported by the engaging teeth of the inclined claw shaft, the thrust movement of the joint in the direction of the tilling drive axis is the same as that of the claw shaft cylinder. It is blocked by an inclined pawl shaft. For this reason, the C pin for stopping the joint is unnecessary, and since the groove is not required to be cut on the tilling drive shaft, there is no portion where stress is concentrated on the tilling drive shaft, and a breakage accident of the tilling drive shaft is caused in advance. Be blocked.

〔Example〕

An embodiment of the present invention will now be described with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a transmission case located in the center of the tiller, and a lower part of the transmission case 1 is provided with a cultivating drive shaft 2 extending symmetrically on both sides thereof by a bearing 3 so as to be freely rotatable. The cultivating drive shaft 2 is rotatably supported, and the bevel gear 5,
It is linked through 6. On both sides of the transmission case 1, tilted flanges 7 that are tilted toward the lower side of the transmission case 1 with respect to the axis of the tillage drive shaft 2 are attached. It is rotatably fitted through. This inclined pawl shaft 8 is used for the transmission case 1
A residual tillage treatment claw (not shown) for plowing the lower part of the is attached. 10 is an oil seal and 11 is a spacer. The inclined pawl shaft 8 and the cultivating drive shaft 2 are interlocked by a joint 12 fitted on the cultivating drive shaft 2. That is, the joint 12 is spline-fitted to the cultivating drive shaft 2, and the engaging teeth 13 of the joint 12 and the engaging teeth 14 provided on the inclined pawl shaft 8 are engaged to allow the cultivating drive shaft 2 to move to the joint 12.
The rotational force is transmitted to the inclined pawl shaft 8 via the. Further, a pawl shaft cylinder 15 is fitted and fixed to the outside of the joint 12 on the cultivating drive shaft 2, and a cultivating pawl shaft 16 is further fixed to the pawl shaft cylinder 15 in the extension direction by a stop bolt 17. The required number of tillage claws (not shown) are mounted on the claw shaft cylinder 15 and the tillage claw shaft 16.

On the other hand, the joint 12 is provided with an engaging tooth 14 of the inclined pawl shaft 8.
A trapezoidal washer 19 that comes into contact with a washer 18 that is closely fitted to the outside of the is fixed by a C pin 20, and its inner surface is supported by the engaging tooth 14 of the inclined pawl shaft 8 through the washer 18. There is. Further, the outer end of the joint 12 on the side of the claw shaft cylinder 15 is supported by the claw shaft cylinder 15, and the joint drive shaft 2 of the joint 12 is supported.
The thrust movement in the direction is blocked by the pawl shaft cylinder 15 and the inclined pawl shaft 8. Tillage drive shaft 2 and joint 12
An O-ring 21 for stopping the oil is inserted between and. 22 is a flexible seal for sealing the inside of the inclined pawl shaft 8, and 23 is its seal cover.

In the one configured as above, the plowing drive shaft 2
The joint 12 that interlocks the inclined claw shaft 8 with the claw shaft cylinder 15 side is supported by the claw shaft cylinder 15 and the inclined claw shaft 8 side is supported by the engaging teeth 14 of the inclined claw shaft 8 and Since it is sandwiched between the inclined pawl shaft 8 and the joint,
Thrust movement of 12 inward and outward in the direction of the plowing drive shaft 2 is blocked by the pawl shaft cylinder 15 and the inclined pawl shaft 8. Therefore, the C pin for stopping the joint 12 on the cultivating drive shaft 2 is unnecessary, and it is not necessary to cut the groove on the cultivating drive shaft 2. Therefore, it is possible to prevent breakage accidents of the plowing drive shaft.

FIG. 2 and FIG. 3 show other examples of the above-mentioned structure.

The one shown in FIG. 2 is a plowing drive shaft 2 and an inclined pawl shaft 8.
In the interlocking mechanism with, the joint 12 is formed with bevel gear-shaped engagement teeth 24, and the bevel gear-shaped engagement teeth 25 that mesh with the engagement teeth 24 of the joint 12 are formed on the inner surface of the inclined claw teeth 8. There is. And in this embodiment, the joint 12
The inward thrust is blocked by the engagement of the bevel gear-shaped engaging teeth 24, 25, and the outward thrust is blocked by the pawl shaft cylinder 15 as in the above case.

Further, as shown in FIG. 3, the joint 12 has a spherical shape centered on a cross point P with the axis of the tillage drive shaft 2, and the inner surface of the inclined pawl shaft 8 also has a spherical shape corresponding thereto. The engaging teeth 26 and the engaging teeth 27, which are formed over substantially the entire width, are engaged with each other. Therefore, the engagement between the joint 12 and the inclined pawl shaft 8 is improved, and the strength of the mechanism is significantly improved.

In this embodiment, a lubricating oil circulation path is formed between the space 28 in the inclined pawl shaft 8 and the transmission case 1. That is, a bypass 29 that connects the ball gap between the bearing 9 for receiving the inclined pawl shaft 8 and the bearing 3 for receiving the tilling drive shaft 2 is formed, and the ball gap of the bearing 9 from the space 28 in the inclined pawl shaft 8 is formed. The bypass 29 and the ball gap between the bearings 3 reach the transmission case 1, and further a circulation path for the lubricating oil is formed from the transmission case 1 to the space 28 via the gap 30 between the tiller drive shaft 2 and the inclined flange 7. .
A fan 31 that circulates lubricating oil is provided on the spacer 11 that rotates together with the inclined pawl shaft 8.
By the fan 31 which rotates in accordance with the rotation, the lubricating oil in the inside thereof is constantly lubricated with the lubricating oil in the transmission case 1 through the circulation path. Therefore, the narrow space 28 in the inclined pawl shaft 8
Lubricating oil does not deteriorate over a long period of time.

[Effect of device]

In essence, the present invention provides an inclined claw shaft for mounting a residual tillage processing claw for plowing the lower part of the transmission case on the transmission case side of the tilling drive shaft extending from the transmission case in the central part to the left and right thereof. A center drive type rotary tiller working machine, which is fitted outside and has a claw shaft tube for mounting a tilling claw fixed to the outside of a tilting claw shaft of a tilling drive shaft, wherein the above-mentioned tilling drive shaft and tilting claw shaft are cultivated. The engaging claw of the joint externally fitted to the drive shaft and the engaging tooth of the inclined claw shaft are engaged and interlocked with each other, and the claw shaft cylinder side of the joint is supported by the claw shaft cylinder, and the inclined claw of the joint is formed. Since the shaft side is supported by the engaging teeth of the inclined pawl shaft and the thrust movement of the joint in the direction of the tilling drive shaft is blocked by the pawl shaft cylinder and the inclined pawl shaft, the tiller drive shaft and the inclined pawl shaft are configured. And are connected to the cultivating drive shaft with a joint by external fitting. However, since the joint does not move in the thrust direction, the C pin is not needed to fix the joint to the cultivating drive shaft, and it is not necessary to cut a groove in the cultivating drive shaft. Therefore, the strength reduction and stress concentration caused by cutting the groove are eliminated. The present invention has the effect of preventing breakage accidents of the plowing drive shaft, which tended to occur during plowing work.

[Brief description of drawings]

The drawings show an embodiment of a drive device for an inclined pawl shaft in a rotary tiller according to the present invention, and FIG. 1 is a longitudinal sectional front view of a main portion showing the embodiment, FIG. 2 and FIG.
The drawings are vertical front views of essential parts showing other embodiments. 1 ... Transmission case, 2 ... Tillage drive shaft, 3 ... Bearing, 4 ... Transmission shaft, 7 ... Inclined flange, 8 ... Inclined pawl shaft, 9 ... Bearing, 11 ... Spacer, 12 ... Joints, 13, 14 …… Engaging teeth, 15 …… Claw shaft cylinder, 16 …… Plowing claw shaft, 18 …… Washers, 19 …… Trapezoid washers, 22 ……
Flexible seal, 23 …… Seal cover

Claims (1)

[Scope of utility model registration request] 1. An inclined claw shaft for mounting a residual tillage treatment claw for plowing the lower part of the transmission case is externally fitted to the transmission case side of the tillage drive shaft extending from the transmission case in the central part to the left and right thereof. In addition, in a center drive type rotary tiller working machine in which a claw shaft cylinder for mounting a tiller claw is fixed to the outside of the tilt claw shaft of the tiller drive shaft, the tiller drive shaft and the tilted claw shaft are The engaging teeth of the joint and the engaging teeth of the inclined claw shaft that are fitted on the joint are engaged and interlocked with each other, and the claw shaft cylinder side of the joint is supported by the claw shaft cylinder, and the inclined claw shaft side of the joint is Is supported by the engaging teeth of the inclined pawl shaft so that the thrust movement of the joint in the direction of the tilling drive axis is prevented by the pawl shaft cylinder and the inclined pawl shaft. Claw shaft drive device.