JPH08966U - Sealed rolling bearing - Google Patents

Abstract

(57) [Summary] [Object] To form a radially extending intermediate lip between an outer lip and an inner lip, and to have a thinned second constricted portion at a root portion of the inner lip and the intermediate lip. This improves the followability of the inner lip to improve the sealing performance and also reduces the torque. [Structure] A second constricted portion 136 is provided inside the roots of the inner lip 134 and the intermediate lip 135, and a thinned second constricted portion 136 is formed. A peripheral groove 121 having a shape is provided, and an outer lip 133 of the sealing plate 13 contacts an outer peripheral surface of the peripheral groove 121, and an inner lip 134 contacts an inner side wall 1212 of the peripheral groove 121.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling bearing sealing device, and more particularly, to improvement of a sealing portion on a non-fixed side of a sealing plate.

[0002]

[Prior art]

 As shown in FIG. 3, the conventional sealed type rolling bearing has a peripheral groove 2 having a substantially U-shaped cross section formed on the outer diameter surface of the end portion of the inner ring 1, and an axial direction and a radius on the inner diameter portion of the sealing plate 3. Two lips 4 and 5 extending in the direction are formed, the outer lip 4 is in contact with the outer peripheral surface following the peripheral groove 2, and the inner lip 5 is slidably contacted with the inner wall 7 ( See Japanese Utility Model Laid-Open No. 62-85723). Therefore, since the two lips 4 and 5 have a thin constriction (also referred to as a neck) which is common to each other, they can move in an interlocking manner, so that one of the lips wears and the contact pressure thereof decreases. Also, the contact pressure of the other lip increases, and the deterioration of the performance of the other lip can be compensated.

However, since the inner lip 5 is thick and has high rigidity, it is difficult for the inner lip 5 to be deformed following the movement of the bearing by itself, so that the contact pressure on the inner wall 7 is inevitably increased. The torque increases in proportion to this. Therefore, a radially extending intermediate lip is formed between the outer lip and the inner lip, and a second constricted portion with a thin wall is formed at the roots of the inner lip and the intermediate lip, so that the followability of the inner lip is improved. It is a technical subject of the present invention to improve the sealing performance and improve the sealing performance and to reduce the torque.

[0004]

[Problems to be solved by the device]

 The present invention has the following technical configuration in order to solve the above technical problems. It has a sealing plate that is fixed to one of the outer ring and the inner ring and seals the space between the other ring and the other ring. Includes a first constricted portion having a reduced thickness, an outer lip extending outward in the axial direction following the first constricted portion, an inner lip extending inward in the axial direction, A hermetically sealed rolling bearing having a radially extending intermediate lip at the inner lip and a second constricted portion at the root of the intermediate lip with a reduced thickness, and a sealing portion between the sealing plate and the sealing plate. The inner ring forming the groove has a peripheral groove having a substantially U-shaped cross section, and the outer lip of the sealing plate contacts the outer peripheral surface of the peripheral groove and the inner lip contacts the inner wall of the peripheral groove. Another object of the present invention is to provide a sealed rolling bearing.

[0005]

[Action]

 The sealing plate is provided with a first neck portion having a reduced wall thickness, and subsequently to an outer lip extending in the axial direction and an inner lip extending inward in the axial direction, an intermediate rib extending in the radial direction is disposed approximately in the middle. The second lip is formed at the roots of the inner lip and the middle lip, and the inner lip that slidably contacts the inner wall of the circumferential groove is increased, and at the same time, the slidable contact is formed. Since the pressure is small, the torque on the inner wall can be made smaller, and the intermediate lip does not contact the inner and outer side walls of the circumferential groove and the bottom wall of the circumferential groove with a slight seal clearance, and the labyrinth seal part is provided between them. It is formed.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a hermetically sealed rolling bearing of the present invention, and FIG. 2 is an enlarged sectional view of an essential part.

Reference numeral 10 is a rolling bearing that is fixed to one race ring (outer ring) 11 and has a sealing plate 13 that seals the gap between the other race ring (inner ring) 12. The sealing plate 13 is made of a plastic material such as rubber or synthetic resin, and fitting edges 131 provided on the outer periphery of the sealing plate 13 are fixed to both ends of the inner peripheral surface of the race ring (outer ring) 11. A first constricted portion 132, which is fixed to the groove 1101 and has an inner peripheral edge portion on the non-fixed side, has a thin wall thickness, and an outer lip 133 which is continuous with the first constricted portion 132 and extends outward in the axial direction. It has an inner lip 134 extending inward in the axial direction and an intermediate lip 135 extending radially between the both lips 133, 134, and the inner lip 134 and the root of the intermediate lip 135 have a wall thickness. An elastic bulge 137 having a thinned second constriction 136 is integrally formed.

At both ends of the outer peripheral surface of the other bearing ring (inner ring) 12 in contact with the sealing plate 13, peripheral grooves 121 having a substantially U-shaped cross section are formed, leaving an outer peripheral surface 122 on the end surface side. . An outer wall 1211 is formed on the outer side by the circumferential groove 121, an inner wall 1212 is formed on the inner side, and a bottom wall 1213 is formed between the both walls.

An outer lip 133 is in contact with the outer peripheral surface 122, an inner lip 134 is in contact with the inner wall 1212, and the intermediate lip 135 is minute with respect to the walls 1211, 1212, 1213 between the both lips 133, 134. The labyrinth seals are formed between the two facing each other.

In the drawings, reference numeral 138 is a metal plate for reinforcing the sealing plate 13, 14 is a retainer, and 15 is a ball arranged between the outer race 11 and the inner race 12 via the retainer 14.

[0011]

[Effect of device]

 As described above, in the hermetically sealed rolling bearing of the present invention, each seal lip formed on the peripheral edge of the sealing plate 13 on the opposite side to the fixed side has the second constricted portion 136, so that the inner lip 134 can follow. The sealing performance is not deteriorated due to lip wear, and the contact pressure is small, so torque fluctuations are small and high sealing performance can be maintained over a long period of time.

Further, since the intermediate lip 135 is a so-called non-contact labyrinth portion having a seal gap between the circumferential grooves, it has a low torque and is sufficiently durable for long-term use and is practical.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view of a hermetically sealed rolling bearing according to the present invention.

FIG. 2 is an enlarged view of an essential part showing the relationship between the circumferential groove and the lip in FIG.

FIG. 3 is a vertical sectional view of a conventional sealed type rolling bearing.

FIG. 4 is an enlarged view of an essential part showing the relationship between the circumferential groove and the lip in FIG.

[Explanation of symbols]

 11, 12: orbital ring 13: sealing plate 1212: inner side wall 1213: bottom wall 132: first constricted portion 133: outer lip 134: inner lip 136: second constricted portion 137: elastic bulging portion

Claims (1)

[Scope of utility model registration request] 1. A non-fixed side of a sealing plate fixed to one of the outer races and an inner race and having a sealing plate that seals between the other race and the other race. A first constricted portion having a thin wall thickness, an outer lip extending outward in the axial direction and an inner lip extending inward in the axial direction on the peripheral edge of the first constricted portion, In a sealed rolling bearing having a radially extending intermediate lip between the lips, a second constricted portion having a thin wall thickness is provided at a root portion of the inner lip and the intermediate lip, and the second lip is provided between the inner lip and the intermediate lip. The inner ring forming the sealing portion has a peripheral groove having a substantially U-shaped cross section, and the outer lip of the sealing plate contacts the outer peripheral surface of the peripheral groove and the inner lip contacts the inner wall of the peripheral groove. Sealed type rolling bearing.