JPS5822443Y2 - Dust prevention device for bearings in rotating ground work tool attachment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dust-proofing device for a bearing part of a rotary ground work tool, such as a screw auger of a vertical trench excavator, a claw shaft of a rotary tiller, etc.

At least one shaft end of the aforementioned screw auger or pawl shaft is detachably attached to a rotary drive body which is pivotally supported by a transmission case by means of so-called flange bolt fastening means.

In this case, the rotary drive body is supported by a transmission case using a bearing, but the environment is such that foreign matter such as muddy water and mud can easily enter the bearing part during operation.

Therefore, various types of dustproof devices for bearings have been developed in the past, but in all of the conventional examples, the dustproof device is disassembled each time the ground work tool is maintained or replaced, and this requires reassembly. It is a hassle to attach.

The present invention was devised in view of the above-mentioned circumstances, and the dustproof body remains on the transmission case side even when the ground work tool is disassembled, and the dustproof body is assembled in a so-called labyrinth state. The structure has been carefully designed to prevent the intrusion of foreign substances, and its structural features are that the rotary drive body is supported in the transmission case with a bearing for relative rotation, and the shaft end flange of the rotary drive body is connected to the ground. In a device in which the end flanges of a working tool are overlapped and removably attached using a fastener, the inner periphery of an annular dustproof body is overlapped between the shaft end flange and the end flange, and the inner circumference of the ring-shaped dustproof body is overlapped between the shaft end flange and the end flange. At the same time, the radially intermediate portion of the dustproof body is bent inward toward the bearing side to provide a stepped portion, and the radially outer peripheral portion of the dustproof body faces the circumferential groove formed on the inner peripheral wall of the transmission case. It is in the point where I entered it.

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

Figures 1 to 3 show the first embodiment of the present invention applied to a trench excavator, and Figures 4 to 5 show the second embodiment of the present invention.
As an example, a case where the present invention is applied to a side drive type rotary tiller is shown.

First, a first embodiment will be described in detail with reference to FIGS. 1 to 3.

Reference numeral 1 denotes a wheel-type tractor, which tows a vertical trench excavator 3 via a three-point linkage device 2 so as to be able to move up and down.

The trench excavator 3 includes a trench excavator 5 on one side of the machine frame 4, and the trench excavator 5 is located directly behind the rear wheel 7 of the tractor 1. is restrained by a restraining device 6.

The trench section 5 has a transmission case 8 at the top, and an auger casing 9 is vertically connected to the transmission case 8.The casing 9 has a cylindrical shape and has a soil discharge port 10 formed inside its upper part. The soil opening 10 is provided with a soil removal plate device 11.

Inside the transmission case 8, the rotary drive body 12 has a bearing 13.13.
A is pivotally supported for relative rotation around a vertical axis, and the drive body 12 receives power from a power receiving shaft 14 through a bevel gear transmission body 1.
5, it is configured so that transmission is possible.

Note that the tractor PTO shaft 16 is connected to the power receiving shaft 14.
In the embodiment, the transmission shaft 18 has a variable shaft length structure and is covered with a cylinder cover device 19 with a variable bearing type. .

Reference numeral 20 denotes a bearing case, which is fitted into the transmission case 8 and can be attached and detached using a plurality of bolts 21. The driving body 12 is supported by a bearing 13 on this bearing case 20, and a seal is provided on the outside of the bearing 13, that is, at the bottom. A material 22 is fitted to prevent lubricating oil inside the transmission case 8 from leaking.

Note that a circular base 23 of the auger casing 9 is connected to the lower part of the transmission case 8 with bolts 24 .

Reference numeral 25 denotes a ground work tool, which in the embodiment is constructed by having a screw auger 27 spirally arranged around an auger shaft 26 having a cylindrical shaft structure, and a circular end flange 28 at the shaft end of the shaft 26.
is fixed and reinforced with a stay 29.

The end flange 28 is overlapped with the shaft end flange 30 of the rotary drive body 12 in an aligned state with a spigot structure indicated by the reference numeral 31, and is detachably connected with a fastener 32 indicated by a plurality of bolts. However, at this time, the end flange 28 and the shaft end flange 30 are overlapped on the inner peripheral part 34 of the annular dustproof body 33 and fastened together with a fastener 32.

A radially intermediate portion of the dustproof body 33 is bent inward toward the bearing 13 to form a stepped portion 35 , and a radially outer peripheral portion 36 is formed on the inner peripheral wall of the transmission case 8 from the stepped portion 35 of the dustproof body 33 . A so-called labyrinth portion R is formed by entering the groove 37 and having a circumferential groove 37, a dustproof body 33, etc.

In the embodiment, the circumferential groove 37 connects the transmission case 8 and the base 23, but the circumferential groove 37 may be provided directly around the inner periphery of the transmission case 8.

In addition, the dustproof body 33 is connected to the shaft end flange 30 and the end flange 28.
When overlapping and fastening together with the fastener 32, there is a small gap between the end flange 28 and the casing 9, and there is also a small gap between the end flange 28 and the base 23, Further, the dustproof body 33 does not come into sliding contact with the fixed side, that is, the transmission case 8 side, and has a small gap.

Of course, the ground work implement 25 is driven within the casing 9 around the vertical axis.

According to the configuration of the first embodiment described above, the excavated soil is raised by the cooperation of the casing 9 and the screw auger 27 when the ground work tool 25 is driven, and is removed from the casing 9 through the soil discharge port 10 via the releasing plate 38. At this time, a portion of the excavated material attempts to enter through a small gap as shown by arrow A in FIG.

At this time, since the dustproof body 33 is rotating together with the work tool 25, the intrusion is prevented, and the step part 3
5. Due to the labyrinth portion R that is protected from the outer circumferential portion 36 and the circumferential groove 37, etc., the invasion route is lengthened and subjected to invasion resistance,
This is to prevent foreign matter from entering the sealing material 22, bearing 13, etc.

In addition, if the ground work tool 25 is damaged due to long-term use, or if the ground work tool 25 is to be replaced or removed, such as when changing the trench depth, etc., the fastener 3
2 is loosened and removed as shown in FIG. However, the dustproof body 33 does not fall off and can be left on the transmission case 8 side, which facilitates the reassembly of the ground work body 25.

Next, a second embodiment of the present invention shown in FIGS. 4 and 5 will be described in detail, except that the application scene is a side drive rotary tiller, and the basic configuration is the same. The differences will be explained below.

50 is a tilling device, and a transmission case 51 is installed in the center of the machine frame.
It has a transmission case 8 on the machine frame side.

When the rotational force from the tractor PTO shaft is transmitted to the central transmission case 51, the bevel gear transmission body 15 interlocks the wrap transmission body 52 in the side transmission case 8.

The ground work tool 25 is composed of a claw shaft 53 and a claw 54 that is detachably attached to the claw shaft 53, and both ends of the ground work tool 25 are detachably attached to the side transmission case 8 and the bearing part of the side frame 55. The dustproof device of the present invention is provided on the side transmission case 8 side under the above-described structure.

In this second embodiment as well, the dustproof body 33 prevents muddy water and mud from entering during plowing work using the work implement 25, and when the work implement 25 is removed, the dustproof body 33
remains on the transmission case 8 side.

In summary, according to the present invention, the inner periphery of the annular dustproof body is superimposed on the shaft end flange of the rotary drive body and the end flange of the ground work tool, and the outer periphery of the annular dustproof body is overlapped with the end flange of the ground work tool. By entering the inner circumferential groove to create a labyrinth structure, the intrusion path for foreign objects is increased and intrusion resistance is added to prevent foreign objects from entering the bearing. is left in engagement with the circumferential groove of the transmission case, and has great practical value in that it can prevent it from falling off.

[Brief explanation of the drawing]

Figure 1 is an overall plan view of the proposed device applied to a vertical trench excavator, Figure 2 is an elevational sectional view of the proposed device in Figure 1, and Figure 3
The figure is a sectional view of the state in which the work tool is removed in Figure 2, and Figure 4.
The figure is an explanatory rear view of the entire side drive rotary tiller to which the present device is applied, and FIG. 5 is a sectional view of the present device in FIG. 4. 8... Transmission case, 12... Rotating drive body, 13... Bearing, 28... End flange, 30... Shaft end Flange, 32...
- Fastener, 33... Dustproof body, 34...
Inner peripheral part, 35... Step part, 36... Outer peripheral part, 37... Circumferential groove.

Claims (1)

[Scope of utility model registration request] A rotary drive body 12 is relatively rotatably supported on a transmission case 8 by a bearing 13, and an end flange 28 of a ground work tool 25 is overlapped with a shaft end flange 30 of the rotary drive body 12 to form a fastener 3.
2, the inner peripheral part 34 of the annular dustproof body 33 is overlapped between the shaft end flange 30 and the end flange 28 and fastened together with the fastener 32, and the dustproof body 33 is bent inward toward the bearing 13 to provide a stepped portion 35, and a circumferential groove 37 formed on the inner peripheral wall of the transmission case 8 is provided at the radially outer peripheral portion 36 from the stepped portion 35 of the dustproof body 33. The rotary ground work tool mounting feature is a dust-proof device for the bearing part of the equipment.