JPS5921602Y2 - Seal structure of transmission case in side drive type rotary work machine - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the sealing structure of the transmission case of a side-drive type rotary working machine capable of extending the plowing width.

In rotary working machines that are equipped with an extension claw shaft on the outside of the transmission case, a hole for inserting the extension claw shaft is formed in the transmission case cover that surrounds the inside of the transmission case, and this hole prevents lubricant oil from leaking. To prevent this, a sealing member is placed near the hole.

Conventionally, this sealing member was fitted into the boss portion of a sprocket that transmits power to the pawl shaft or the end of the extended pawl shaft, and was also fitted into and supported by an annular support member with an angular cross section provided on the inner surface of the transmission case cover. has been done.

One side of the annular support member and the inner surface of the transmission case cover are bonded together by spot welding with an adhesive applied thereto, and since there is only a small amount of adhesive applied to the surface, oil may leak from the bonded portion.

In order to eliminate these drawbacks, the ends of the annular support member that are joined to the inner surface of the transmission case cover are formed into a forked shape, and a seal ring is placed between the forked ends and the transmission case cover. It is conceivable that this seal ring could be configured to prevent oil leakage, but with this structure, dirt may adhere during welding of the annular support member, creating a gap, or the seal ring may be improperly set. It is difficult to completely prevent oil leakage.

In view of the above-mentioned problems, the present invention forms the part that supports the sealing member that seals the inside of the transmission case by bending the transmission case cover itself in an annular shape, and forms the part that supports the sealing member that seals the inside of the transmission case. A transmission case for a side drive type rotary working machine that is configured to completely prevent oil leakage between the support part of the seal member and the transmission case cover by welding a plate member having an extension shaft insertion hole to the transmission case cover. The purpose is to provide a seal structure.

This invention provides a transmission case for a side-drive type rotary work machine that can connect an extension shaft on the same layer as the pawl shaft. A bent annular support part is formed on the rotating transmission body side to support a sealing member that slides into contact with the inside of the transmission case to seal the inside of the transmission case, and an extension shaft insertion hole is formed on the outside of this annular support part. It is characterized in that the plate member is fixed.

In the present invention, instead of the extension claw shaft, a power take-off shaft provided with a transmission means such as a pulley for driving another working machine may be used as the extension shaft.

Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a side-drive type rotary working machine, which is connected to a tractor (not shown) via a three-point link or other link mechanism.

The working machine 1 has a pair of lower link brackets 5 fixed in the longitudinal direction to both ends of a support 4 having a transmission case portion 3 bulged in the center, and a support body 7 having a transmission case 6 on each bracket 5, and a support frame. 8 and 8 are welded to each other, and a transmission case 6 and a support frame 8 are arranged correspondingly on both sides.

A bearing case 1 is located below the transmission case 6 and the support frame 8.
Each case 10.11 is detachably supported by a bolt, and an end shaft 16 having a flange 16a is supported on each case 10.11 via a ball bearing 14 so as to be relatively rotatable around a horizontal horizontal axis. A pawl shaft 19 having a large number of pawls 18 between the pawls 16a is fastened by a port T-20 (only the inside of the bearing case 10 side is shown).

22 is an input shaft, 23 is an output shaft, and the power received from the input shaft 22 is transmitted to the rotary transmission body 26 via the output shaft 23 and a chain or the like inside the transmission case 6.

The rotary transmission body 26 has a boss portion 27 spline-fitted to the end shaft 16, and the rotation of the rotary transmission body 26 is caused by the end shaft 1.
6 (forming one end of the claw shaft 19), the claw shaft 19 rotates.

A circumferential recess 16b is formed on the outer end surface of the end shaft 16, and a blind screw 16C is provided at the axial center.

When the boss portion 27 is spline-fitted onto the end shaft 16, a spline fitting portion 27a with an open outer end is formed on the boss portion 27, and when the fitting portion 27a has a standard plowing width, the spline fitting portion 27a is shown in Fig. 2. When the connecting body 33 shown by the solid line has an extended tillage width, the connecting body 34 has a front part having the same shape as the connecting body 33 and a flange-shaped extension claw shaft attachment part 34a, as shown by the phantom line in FIG. They are each spline-fitted to be replaceable.

The coupling bodies 33 and 34 both have recesses 33 a , 34 b for the bolts 35 and a circumferential recess 16 .
The connecting body 33 is completely fitted into the fitting part 27a, but the connecting body 34 is fitted so that its mounting part 34a is located outside the transmission case cover 31. , forming one end of the extension shaft 40.

Reference numeral 37 denotes a sealing member for sealing the inside of the transmission case 6, which includes the inner peripheral surface of an annular support portion 38 formed by bending the extension shaft connection portion of the transmission case cover 31 toward the rotating transmission body 26 side and the outer periphery of the boss portion 27. The lubricating oil contained in the transmission case 6 is prevented from leaking.

An annular recess 31a is formed around the outer end of the annular support portion 38, and the annular recess 31a is recessed one step inward.
The disk members are welded (or bolted) to a.

The disc member 44 is welded by projection welding by applying an adhesive to the annular recess 31a.

A hole 44a for inserting the end shaft 16 and the connecting body 34 of the open base is bored between the disc members, and this hole 44a creates only a small gap between the connecting body 34 to be inserted, and the transmission case is closed. 6.Do not allow dirt to enter the interior.

When the extension shaft 40 is not connected to the standard tillage width, the hole 44a is covered with a closure cap 39 made of an elastic material.

The sealing member 37 is in sliding contact with the boss portion 27 of the rotational transmission body 26, and the outer peripheral surface of the connecting body 33 or 34 or the outer end of the end shaft 16 is exposed and brought into sliding contact with the outer peripheral surface. Can be configured.

Incidentally, these connecting bodies 33, 34 and the end shaft 16 are also rotation transmission bodies.

Conventionally, the annular support part 38 that supports the seal member 37 is formed as a separate member from the transmission case cover 31, so oil leakage from the welded part between that member and the transmission case cover 31 becomes a problem. However, in the present invention, the annular support part 38 is formed in the part where the transmission case cover 31 is bent inward, that is, in the integrally molded part, so a seal ring is not required and oil leakage is prevented. It is completely prevented, manufacturing is extremely easy, and assembly accuracy is improved.

In addition, since the plate member fixed to the transmission case cover has a hole for inserting the extension shaft, there is no problem in connecting the extension shaft.
Dust is also prevented from entering the sealing member when the extension shaft is connected.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway rear view of a side drive type rotary working machine, and FIG. 2 is a cross-sectional explanatory view showing an embodiment of the present invention. 1...Side drive type rotary work machine, 6.
...Transmission case, 16... End shaft, 26
... Rotating transmission body, 31 ... Transmission case cover, 31 a ... Annular recess, 33°34.
...Connection body, 37...Seal member, 38
. . . Annular support part, 39 . . . Closing cap, 44 . . . Disc, 44 a . . . Hole.

Claims (1)

[Scope of utility model registration request] In the transmission case of a side drive type rotary work machine that can connect an extension shaft on the same layer as the claw shaft, the transmission case cover that surrounds the inside of the transmission case has a transmission case that slides into contact with the rotating transmission body that transmits power to the claw shaft. A bent annular support part is formed on the rotating transmission body side to support the seal member that seals the inside of the case, and a plate member in which a hole for inserting an extension shaft is formed is fixed to the outside of this annular support part. A seal structure of a transmission case in a side drive type rotary working machine, which is characterized by: