JPS6146771A - Bearing structure of roller for crawler type vehicles - Google Patents

Abstract

PURPOSE:To dispense with lubricating oil, by using a self-lubricating spherical bearing in a bearing structure of a roller for a crawler type car supporting an end part of the roller on a roller frame via a bearing. CONSTITUTION:A left end of a roller 8 is supported on a roller frame 3 via a self-lubricating spherical bearing 22. This self-lubricating spherical bearing 22 is provided with an inner race 22a being pressed in the left end of the roller 8 and regulated by a stepped part 8a for its position and an outer race 22b locked to the roller frame 3 with a bolt or the like, and made up of inserting a solid lubricant into space between spherical slide surfaces 22c of both races. In addition, at the left end of the outer race 22b, a cap 24 set up via an O-ring 25 is locked with a bolt 26.

Description

[Detailed description of the invention] [Fields where the invention benefits] The present invention relates to a bearing structure for a roller for a tracked vehicle.

[Background of the invention]

As a bearing structure for a roller used in a tracked vehicle such as a hydraulic excavator traveling body, the structure shown in FIG. 4 is known.

The row 8 is constructed symmetrically by abutting a pair of members having a hollow space in the center and welding them together, and both ends of the row 8 are supported by the roller frame 3 via bearings, respectively.

A bearing cage 1 is fixed to the roller frame 3 by bolts 2, and a spherical roller bearing 4 is installed between the bear link cage 1 and the end of the roller 8. In order to maintain the lubricity of the spherical roller bearing 4, lubricating oil 11 is sealed in a cavity formed nearby. this? I! +
! In order to prevent the lubricating oil 11 from leaking, the bearing cage 1
An O-ring 10 is disposed between the retainer seal 6 and the retainer seal 6, and an O-ring 5 is disposed between the outer ring of the spherical roller bearing 4 and the bearing cage 1. In fact, a seal 7 is installed between the roller 8 and the retainer seal 6 to prevent dirt and muddy water from entering from the outside and to prevent the lubricating oil 11 from leaking.

Since the conventional bearing structure had the above-mentioned configuration, when supporting the roller 8 on the roller frame 3, the roller 8 and the bearing cage 1 were temporarily fixed in a pre-assembled state using bolts 12 as shown at the left end of the drawing. bearing cage l
was fixed to the roller frame 3 with bolts 2, and after that, 12 was removed, lubricated with lubricating oil 11, and sealed in a plug 9 as shown at the right end of the drawing.

In this way, it is necessary to attach and detach the bolt 12,
Further, since O links 5, 1 O, and seals 7 are required to prevent lubricating oil from leaking, conventional bearing structures are complex and have poor workability during assembly.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a roller bearing structure for a tracked vehicle that is simple in structure and improves workability during assembly.

[Summary of the invention]

The present invention is characterized in that both ends of the roller are supported by non-lubricated spherical bearings, thereby eliminating the need for lubricating oil reservoirs, leakage prevention structures, etc. that were conventionally necessary.

[Embodiments of the invention]

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 is a sectional view showing the left half of the roller bearing structure. The left end of the roller 8 is supported by the roller frame 3 via a non-lubricated spherical bearing 22.

This lubricant-free spherical bearing 22 has an inner race 22a that is press-fitted into the left end of the roller 8 and whose position is regulated by a stepped portion 8a, and an outer race 22b that is fixed to the roller frame 3 with a non-rotating bolt or the like. A solid lubricant is inserted between the spherical sliding moving parts 22c, and the thrust load and radial load accompanying the rotation of the roller 8 are provided in the cat's spherical sliding moving parts 22c. Next, a structure for protecting the spherical sliding moving image 22c from dirt and muddy water will be explained.

The left end of the outer race 22b is sealed with a cuvette 24 placed through an O-ring 25 and fixed by a bolt 26, while the right end of the outer race 22b is sealed with a seal 23 that is closely connected to the inner race 22a. Both sides of the spherical sliding moving image 22c are sealed by seal members.

Although FIG. 1 only shows the sliding structure on the left side of the roller 8, the right side is also symmetrical and has the same structure.

Non-lubricant spherical bearings have spherical contact, whereas conventional spherical bearings have a structure in which contact is made with multiple lines, so the contact area is large and load carrying capacity can be improved. Further, the non-lubricated spherical bearing 22 does not require a lubricating oil reservoir or a leakage prevention structure unlike the conventional one, so it has an extremely simple structure. Furthermore, since the outer race 22b is fixed to the roller frame 3, there is no need to temporarily fix it during pre-assembly and then remove it due to what was present in between, which improves workability compared to the conventional method. can. In other words, the non-lubricated spherical bearing 22 is attached to the end of the roller 8 during pre-assembly.
Even if a sealing member such as the cap 24 is attached, there is no need to remove these afterwards.

2 and 3 are sectional views of main parts of bearing structures according to other different embodiments, and FIG. 2 shows an outer race 2.
The sealing surface of the seal 23 attached to 2b is brought into contact with the end shaft portion of the roller 8, and in FIG. 3, the sealing surface of the seal 23 is brought into contact with the side surface of the roller 8. In both embodiments, two seal members are attached to the outer race 22b, making the structure even simpler.

〔Effect of the invention〕

As explained above, the present invention uses a non-lubricated spherical bearing, which eliminates the need for a structure for lubricating oil, which was necessary in the past.Also, since the outer race is fixed to the roller frame, there is no need for a structure between the two. There is no need for temporary fixing at the preliminary assembly stage, which simplifies the structure and improves workability during assembly.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a sectional view of a main part showing a roller bearing structure according to one embodiment of the present invention, and FIGS. 2 and 3 are roller bearings according to other different embodiments of the present invention. FIG. 4 is a sectional view showing a conventional roller bearing structure. 3...Roller frame, 8...Roller, 22...
・Non-lubricated spherical bearing, 22a...inner race,
22b... Outer lace, 23... Seal, 24... Cap. Figure 1 Figure 25El Figure 3

Claims (1)

[Claims] 1. In a bearing structure for a roller for a tracked vehicle in which the end of the roller is supported on a roller frame via a bearing, the bearing is a non-lubricated spherical bearing, and the inner race is connected to the end of the roller. the outer race is fixed to the roller frame, and members for preventing the intrusion of earth and sand from the outside are provided on both sides of the spherical moving image between the inner race and the outer race. Bearing structure for rollers for type vehicles. 2. The bearing structure for a roller for a tracked vehicle according to claim 1, wherein both of the members are attached to both ends of the outer race, respectively.