JP2003004033A - Composite swivel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite swivel capable of, withstanding both thrust and radial loads, being easily built, suppressing noise into low level and giving operating performance accompanied by no squeak noise when rotating. SOLUTION: This bearing 1 is one of components of a caster A and comprises a radial bearing 2 and a thrust bearing 3 that are integrated, a rolling body guiding member 4 used specially for a radial ball bearing and a rolling body guiding member 5 used specially for a thrust bearing that are integrally formed making at a right angle with each other. Further, an outside rolling body guiding member 4a within the rolling body guiding member 4, an outside rolling body guiding member 5a bent at a right angle to the member 4a and being within the rolling body guiding member 5; an outer ring comprises an external resinous case 6 incorporating these guiding members 4a, 5a. On the other hand, an inside rolling body guiding member 4b within the rolling body guiding member 4, an inside rolling body guiding member 5b bent at a right angle to the member 4b and being within the rolling body guiding member 5; an inner ring comprises an internal resinous case 7 incorporating these guiding members 4b, 5b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing used for casters and the like, and more particularly to a compound universal bearing in which a radial bearing and a thrust bearing are formed as an integral structure.

[0002]

2. Description of the Related Art Among bearings used for casters of trucks, a bearing as shown in FIG. 2 is often used as a medium-weight bearing. The bearing 100 is arranged on a yoke 102 that is attached to the axle 101a of the wheel 101 at a so-called caster angle, and thus the bearing 100
The center line of is offset by a predetermined distance L with respect to the axle 101a. This bearing 100 has a laminated structure of a ball bearing 100a having a rolling element guide member 102a pressed on the upper portion of a yoke 102 as an inner race and a ball bearing 100b having the rolling element guide member 102a as an outer race. Is. The outer race of the bearing 100a is a bracket 103 that supports a pedestal body (not shown).
Then, the rolling element guide member 102a constituting the inner race
It is arranged corresponding to. On the other hand, the bracket 104 that constitutes the inner race of the bearing 100b is arranged corresponding to the rolling element guide member 102a that constitutes the outer race. The rolling element guide member 102a and the brackets 103 and 104 that form the inner race and the outer race of the bearings 100a and 100b are fixed by rivets 105.

As a heavy bearing, there is a bearing as shown in FIG. The bearing 200 is arranged above the columnar member 203 via a yoke 202 that is attached to the axle 201a of the wheel 201 at a caster angle. The bearing 200 is a ball bearing 200a arranged immediately below a bracket 204 that supports a pedestal body (not shown).
And an angular roller bearing 200b arranged below the ball bearing 200a via a bracket 205. These ball bearing 200a and angular roller bearing 200
The b is tightened together with the brackets 204 and 205 by a bolt 206.

[0004]

However, the medium-light weight bearing having the above-mentioned laminated structure is a thrust bearing, and no consideration is given to a radial load. A radial load is acting to some extent on a bearing such as a caster in which the center line of the bearing is offset with respect to the axle. Especially, when a large radial load is applied, such a bearing is Not preferable. Also,
A bearing having such a laminated structure is prone to misalignment and difficult to assemble, and moreover, since the rolling element guide member also serves as an inner race and an outer race, the rolling groove with accurate unevenness is formed. Machining is not easy and noise is easily generated. Further, in a bearing having a laminated structure in which the inner race and the outer race are riveted at the bearing center, if a biased load is applied, for example, during a turning operation, a so-called mouth opening phenomenon occurs between the inner race and the outer race. Therefore, there is a problem that squeaks occur and a smooth turn cannot be made. On the other hand, the heavy type bearing is preferable because it takes radial load into consideration, but it is heavy in weight and expensive because it has a structure in which a ball bearing and an angular roller bearing are simply laminated independently. There is a problem that becomes.

An object of the present invention is to provide a compound universal bearing which can cope with both thrust and radial loads, is easy to assemble, has a low noise level, and has an operating performance without squeaking in turning. .

[0006]

In order to solve the above-mentioned problems, a compound universal bearing according to claim 1 of the present invention is a bearing in which a radial bearing portion and a thrust bearing portion are formed as an integral structure. A rolling element guide member for a bearing and a rolling element guide member for a thrust bearing are integrally formed so that both rolling element guide members form a predetermined angle, that is, both bearings form a predetermined angle. It was done. According to the present composite universal bearing, the radial bearing portion and the thrust bearing portion are integrally structured so that both thrust and radial loads can be dealt with, so that the bearing can be widely used as a lightweight type to heavy type bearing. , Is lighter in weight than the conventional heavy-duty bearing in which radial bearings and thrust bearings are simply stacked,
Moreover, it can be manufactured at low cost. Further, in the present composite universal bearing, both bearings have an integral structure as described above, and the rolling element guide members are distinguished for the radial bearing and the thrust bearing, respectively. Alignment is less likely to occur, and noise can be kept low. Further, in this composite universal bearing, even if an eccentric load is applied at the time of turning motion, since both rolling element guide members form a predetermined angle, it is possible to cancel the opening that occurs between the inner race and the outer race. It suppresses the occurrence of creaking and enables smooth turning. The rolling elements of the radial bearing portion and the thrust bearing portion may be balls (balls) or rollers (rollers).

According to a second aspect of the present invention, the rolling bearing guide members are formed so that the predetermined angle is 90 °. The radial bearing portion is provided with a radial load, and the thrust bearing is also formed. The thrust load is shared by the parts to perform the original function. However, for example, an angular contact ball bearing or an angular roller bearing may be used for the thrust bearing portion to allow the thrust bearing portion to share a part of the radial load.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. A compound universal bearing 1 according to an embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the main bearing 1 is one of the constituent members of the caster A and is a compound universal bearing in which the radial ball bearing portion 2 and the thrust ball bearing portion 3 are formed as an integral structure. In the embodiment, the rolling element guide member 4 dedicated to the radial ball bearing and the rolling element guide member 5 dedicated to the thrust ball bearing are integrally formed, and both rolling element guide members are formed at 90 ° in the present embodiment. Has been done. In the present bearing 1, the outer rolling element guide member 4a of the rolling element guide member 4 and the outer rolling element guide member of the rolling element guide member 5 bent at 90 ° to the outer rolling element guide member 4a. 5a, the outer ring is constituted by the outer resin case 6 which is a resin molded product in which the guide members 4a, 5a are incorporated.
Inner rolling element guide member 4b of rolling element guide member 4, inner rolling element guide member 5b of rolling element guide member 5 bent at 90 ° to inner rolling element guide member 4b, and these elements are guided. The inner ring is formed by the inner resin case 7 which is a resin molded product incorporating the members 4b and 5b. By using a resin molded product such as the outer resin case 6 and the inner resin case 7, it becomes possible to loosen and soften the shock and vibration generated from the balls that are rolling elements. That is, resin cases 6 and 7
Also plays the role of a cushioning material. By the way, in the present embodiment, the inner resin case 7 is provided with the seal portion 7a to prevent the intrusion of dust or dust from the rolling element guide member 5 side. In addition, the rolling element guide member 4 side is provided with a rolling element retainer 8
This prevents dust and dust from entering the rolling element guide member 4.

A holding plate 9 having a through hole communicating with a through hole of the inner ring (a central shaft hole of the main bearing 1) is arranged on the lower surface of the inner ring in a manner of gripping the inner ring. It is fixed by rivets 10 which are inserted into both through holes. In addition, a pair of yokes 11 forming the caster A are projected on the lower surface of the inner ring (only one side is shown in FIG. 1), and the tapered end portion of the yoke 11 is connected to the center line of the main bearing 1. Axle 12a of wheel 12 which is offset with respect to
Is suspended. On the other hand, on the upper surface of the outer ring, a bracket 13 that supports a vehicle body (not shown) is provided.

The caster A provided with the main bearing 1 is adapted to handle both thrust and radial loads, and if the radial bearing portion 2 and the thrust bearing portion 3 are appropriately selected, they can be used for light-weight type to heavy-weight type. It can be used in a wide range as a bearing, and in particular, is lighter in weight than the conventional heavy type bearing. Further, in the present bearing 1, since both the radial bearing and the thrust bearing are resin-molded to form an integral structure, as described above, in addition to being easily assembled as a component of the caster A, misalignment hardly occurs,
Noise can be kept low. Furthermore, when the bearing 1 receives a biased load in the thrust direction via the outer ring located on the left side of FIG. In addition to being integrally incorporated, the rolling element guide member 4 and the rolling element guide member 5 form 90 ° in the present embodiment, so that the outer rolling element guide member 4a moves in the mouth opening direction. Even when a force is applied, the outer rolling element guide member 5a acts in a direction to cancel it, whereby the side opposite to the side on which the unbalanced load is acting (the part drawn on the right side in the figure). ) Offsets the opening of the mouth and suppresses the occurrence of creaking and enables a smooth turn. This is because even if the eccentric load is accompanied by a radial load, the eccentric load acts because a similar action occurs between the inner rolling element guide member 4b and the inner rolling element guide member 5b. As a result of offsetting the mouth opening on the side opposite to the side,
Allows a smooth turn.

By the way, in the present embodiment, the bearing 1 having an integral structure as shown in FIG. 1 has been described. However, the radial bearing portion 2 is replaced with a thrust bearing portion, and the thrust bearing portion 3 is replaced with a radial bearing portion. Alternatively, the main bearing 1 may have the yoke 11 on the outer ring side and the pedestal body on the inner ring side. , Can be adapted extremely flexibly according to the application.

[0012]

According to the composite universal bearing of the present invention, both thrust and radial loads can be dealt with, the assembling is easy, the noise is suppressed to a low level, and the operation performance without squeaking in turning is obtained.

[Brief description of drawings]

FIG. 1 is a front cross-sectional view of a caster including a composite universal bearing according to an embodiment of the present invention.

FIG. 2 is a front cross-sectional view of a caster including a conventional medium-weight bearing.

FIG. 3 is a front cross-sectional view of a caster including a conventional weight type bearing.

[Explanation of symbols]

1 Composite universal bearing 2 Radial bearing 3 Thrust bearing part 4,5 Rolling element guide member 4a, 5a Outer rolling element guide member 4b, 5b Inner rolling element guide member

Claims (2)

[Claims] 1. A compound universal bearing in which a radial bearing portion and a thrust bearing portion are formed as an integral structure, wherein the rolling element guide member for the radial bearing and the rolling element guide member for the thrust bearing are integrally formed. A composite universal bearing, wherein both rolling element guide members are formed at a predetermined angle. 2. The composite universal bearing according to claim 1, wherein the predetermined angle is 90 °.