JPH0614630U - Oil seal - Google Patents

Abstract

(57) [Summary] [Purpose] In a housing rotation type oil seal, the rise of the lip portion from the shaft due to centrifugal force at the time of high peripheral speed rotation is restricted to prevent deterioration of the sealing property. [Structure] A reinforcing ring 15 for holding a seal member 14 has a housing fitting portion 15a extending in an axial direction, an intermediate portion 15b extending radially inward from the housing fitting portion 15a, a waist portion 14e of the seal member 14 to a spring stopper portion 14f. The expansion restricting portion 15c that extends in the axial direction in a non-bonded state.
Even if the main lip portion 14d tries to float up due to centrifugal force when the housing 12 rotates at a high peripheral speed, the expansion regulating portion 15c entirely regulates the position of the main lip portion 14d.
No distortion is generated in 4e or the like.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil seal used in a device of a type in which a housing having a fixed oil seal rotates, such as an oil seal used in bearings for rolling rolls.

[0002]

[Prior art]

 Conventionally, oil seals used in this type of device required special attention to seal failure at high peripheral speed rotation, compared to oil seals used in devices in which the housing was stationary and the shaft rotated. . This is because the oil seal used in this type of device has its lip performance in contact with the shaft lifted by the centrifugal force at the time of high peripheral speed rotation, and the sealing performance for the shaft deteriorates. In order to prevent this, the conventional oil seal has, for example, as shown in FIG. 3, a stopper member 4 having a slight gap with respect to the garter spring 3 on the radially outer side of the lip 2 of the seal member 1. It has a structure fitted to the reinforcing ring 5. When the housing 6 to which the oil seal is fixed is stationary, the lip portion 2 is pressed against the shaft 7 by the garter spring 3, so that the fluid inside the housing 6 is prevented from leaking to the outside. When the housing 6 rotates at a high peripheral speed, the lip portion 2 tends to separate from the shaft 7 due to the centrifugal force thereof, but the garter spring 3 is restricted by the stopper member 4 from expanding, so that a certain amount of floating occurs. It is prevented, and the sealing performance for the shaft 7 of the lip portion 2 is secured.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional oil seal, since the stopper member 4 only restricts the expansion from the garter spring 3 to the tip of the seal member 1, the waist portion 8 between the reinforcing ring 5 and the garter spring 3 has a centrifugal force. Due to this, there is a problem that the state of contact between the lip portion 2 and the shaft 7 becomes unstable due to the distortion, and the sealing performance deteriorates.

The present invention solves such conventional problems, and an object thereof is to provide an oil seal having a high sealing property.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention forms a reinforcing ring for holding a seal member into a substantially U-shaped cross section, and a portion of the reinforcing member facing the shaft of the seal member is entirely contacted with the reinforcing ring. It is intended to restrict the spread.

[0006]

[Action]

 Therefore, according to the present invention, even if the housing, that is, the oil seal rotates at a high peripheral speed and the portion of the seal member facing the shaft is lifted, the position of the portion is entirely regulated by the reinforcing ring. Therefore, the contact state (tensioning force, angle) between the lip portion and the shaft is kept good, and the deterioration of the sealing property can be prevented.

[0007]

【Example】

 FIG. 1 shows an embodiment of the present invention. The oil seal 11 is fixed to the housing 12 and rotates with respect to the shaft 13. The oil seal 11 includes a seal member 14 made of a rubber material and a reinforcing ring 15 made of a metal material that holds the seal member 14. The seal member 14 is vulcanized and adhered to the reinforcing ring 15 during its molding. The seal member 14 has a housing fitting portion 14a fixed to the housing 12, a side surface portion 14b, a sub lip portion 14c, and a main lip portion 14d that is pressed against the shaft 13 by the garter spring 16. The reinforcing ring 15 extends in the horizontal direction and is fixed to the housing 12 via the housing fitting portion 14a of the seal member 14, and a middle portion 15b extending vertically inward from the housing fitting portion 15a. There is an expansion restricting portion 15c extending from there to the end of the seal member 14 in the axial direction. The expansion restricting portion 15c is located radially outside the lip portion and faces the waist portion 14e between the sub lip portion 14c and the main lip portion 14d. In order to hold the waist portion 14e, a slight gap is provided with respect to the waist portion 14e, and a slope is formed according to the shape of the waist portion 14e. On the other hand, the portion facing the garter spring 16 horizontally faces the outer diameter of the spring stop portion 14f at the tip of the seal member 14 with a certain gap.

Next, the operation of the above embodiment will be described. When the housing 12 is stationary, the main lip portion 14d is pressed against the shaft 13 by the garter spring 16 in the same manner as in the conventional case to prevent the fluid inside the housing 12 from flowing out. When the housing 12 starts rotating and reaches a high peripheral speed, the centrifugal force causes the main lip portion 14d to move away from the shaft 13, but the expansion limiting portion 15c of the reinforcing ring 15 is located outside the main lip portion 14d. The expansion of a certain amount or more is prevented, the waist portion 14e is not distorted, the contact state (tension force, angle) of the main lip portion 14d with respect to the shaft 13 is kept good, and the sealing performance is deteriorated. Prevent.

FIG. 2 shows another embodiment of the present invention, which is the same as the above embodiment except that the expansion restricting portion 15c of the reinforcing ring 15 extends horizontally in the axial direction, and has the same operation. Have an effect.

[0010]

[Effect of device]

 As described above, according to the present invention, the reinforcing ring for holding the seal member is formed in a substantially U-shaped cross-section, and the portion of the seal member facing the shaft is not restricted to the reinforcing ring and is restricted in its expansion. Therefore, it is possible to prevent the lip portion from being lifted up from the shaft when the housing rotates at a high peripheral speed, and prevent the deterioration of the sealing property. Further, compared to the conventional oil seal, it is possible to reduce the number of parts and prevent the stopper member from coming off due to vibration or the like.

[Brief description of drawings]

FIG. 1 is a partial sectional view of an oil seal showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of an oil seal showing another embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing an example of a conventional oil seal.

[Explanation of symbols]

 11 oil seal 12 housing 13 shaft 14 seal member 14a housing fitting portion 14b side surface portion 14c sub-lip portion 14d main lip portion 14e waist portion 14f spring stop portion 15 reinforcing ring 15a housing fitting portion 15b middle portion 15c expansion restricting portion 16 garter spring

Claims (1)

[Scope of utility model registration request] 1. A reinforcing ring for holding a seal member, wherein a housing fitting portion extending in an axial direction, an intermediate portion extending radially inward from the housing fitting portion, and an end portion of the seal member from the housing fitting portion are close to the lip portion. An oil seal having a radially outer side of the lip portion and an expansion restricting portion extending in the axial direction in a non-bonded state to the seal member.