JPH0630565U - Oil seal with garter spring - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the main lip from flipping over or turning over when inserting the oil seal into the shaft. [Structure] The bottom of the annular groove 15 in the circumferential direction holding the garter spring 16 and the garter spring 16 are fixed by an adhesive 19. Even when the tip of the main lip 14 hits a corner of the shaft 17 when the oil seal 11 is inserted into the shaft 17, the annular groove 15 and the garter spring 16 are fixed by the adhesive 19, so that the main lip 14 is turned over. Inversion can be prevented.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an oil seal with a garter spring used in automobiles and industrial machines.

[0002]

[Prior art]

 The oil seal has both the function of preventing fluid such as liquid and gas inside the machine from flowing out to the outside, and the function of preventing dust from entering the inside of the machine from the outside. Such an oil seal is usually used for sealing the rotating shaft, and a garter spring for pressing the tip of the main lip, which comes into contact with the rotating shaft, against the rotating shaft so that oil inside does not flow out. I have it. FIG. 2 shows an example of this type of oil seal. The oil seal 1 is composed of a metal reinforcing ring 2 having an L-shaped cross section and a rubber portion 3 vulcanized and bonded to an end portion on the inner peripheral side thereof, and a main lip 4 is formed at a tip portion of the rubber portion 3. An annular groove 5 is formed on the outer peripheral surface of the main lip 4 in the circumferential direction, and a garter spring 6 is fitted in the annular groove 5. In this oil seal 1, the inner peripheral surface of the main lip 4 is fitted on the shaft 7, and the outer peripheral surface of the metal reinforcing ring 2 is press-fitted into the mounting hole of the housing 8 for use.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional oil seal, the inner diameter of the main lip 4 is provided with a tightening allowance in advance with respect to the direct diameter of the shaft 7. Therefore, when the main lip 4 is inserted into the shaft 7, There was a problem that a part or the whole circumference of the tip of No. 4 hits the corner of the shaft 7 and turns up, and in the worst case, it is inverted. Operating the machine without noticing such a condition may cause oil leakage. In particular, if the entire circumference of the main lip 4 is reversed, not only will oil leak, but the garter spring 6 will also come off the annular groove 5 and get caught in the bearing often located near the oil seal, damaging the bearing. If there is a gear in the vicinity of the oil seal, the disengaged garter spring 6 may be caught in the gear and interfere with the normal operation of the machine.

The present invention solves such a conventional problem, and provides an oil seal with a garter spring that can prevent the main lip from flipping over or reversing when the oil seal is inserted into a shaft. The purpose is to

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is characterized in that the bottom of the circumferential annular groove for holding the garter spring and the garter spring are fixed with an adhesive.

[0006]

[Action]

 According to the present invention, since the annular groove for holding the garter spring and the garter spring are fixed by the adhesive even if the tip of the main lip hits the corner of the shaft when the oil seal is inserted into the shaft, It can prevent the main lip from flipping or flipping.

[0007]

【Example】

 FIG. 1 shows the configuration of an embodiment of the present invention. The oil seal 11 is composed of a metal reinforcing ring 12 having an L-shaped cross section and a rubber portion 13 vulcanized and bonded to an end portion on the inner peripheral side thereof, and a main lip 14 is formed at a tip portion of the rubber portion 13. An annular groove 15 is formed on the outer peripheral surface of the main lip 14 in the circumferential direction, and a garter spring 16 which is a closely wound coil is fitted in the annular groove 15. The oil seal 11 is used in such a manner that the inner peripheral surface of the main lip 14 is fitted into the shaft 17 and the outer peripheral surface of the metal reinforcing ring 12 is press-fitted into the mounting hole of the housing 18.

The garter spring annular groove 15 and the garter spring 16 are fixed by an adhesive 19 applied to the entire circumference of the bottom of the annular groove 15. The adhesive 19 is applied uniformly over the entire circumference of the bottom of the annular groove 15 so that the wires forming the garter spring 16 are not adhered to each other, and then the garter spring 16 is mounted. .

When such an oil seal 11 is inserted into the shaft 17, due to the tightening margin given to the main lip 14, the tip end of the main lip 14 comes into contact with the corner of the shaft 17 and tries to turn up. Since the bottom of 15 and the garter spring 16 are fixed by an adhesive, the main lip 14 cannot move, and is compressed by the corner of the shaft 17 and inserted into the shaft 17 as it is. At this time, since the wires or the like of the garter spring 16 are not adhered by the adhesive agent 19, the tightening force of the garter spring 16 on the shaft 17 of the main lip 14 is the same as that of the conventional one, and good sealing performance is maintained. .

As described above, according to the above-described embodiment, the adhesive 19 is applied to the entire circumference of the bottom of the annular groove 15 for the garter spring to fix the garter spring 16 to the annular groove 15, so that the oil seal 11 It is possible to prevent the main lip 14 from turning over or turning over when it is inserted into the shaft 17.

It is preferable that the adhesive 19 be linearly applied to the entire circumference of the bottom of the annular groove 15.

[0012]

[Effect of device]

 As described above, according to the present invention, since the bottom of the circumferential annular groove for holding the garter spring and the garter spring are fixed by the adhesive, the tip of the main lip is fixed to the shaft when the oil seal is inserted into the shaft. It can prevent the main lip from flipping or flipping over at the corners. Therefore, not only the sealability of the oil seal can be kept good, but also the garter spring can be prevented from being detached from the annular groove to prevent the device from being damaged.

[Brief description of drawings]

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

FIG. 2 is a schematic partial sectional view of an oil seal showing a conventional example.

[Explanation of symbols]

 11 Oil Seal 12 Metal Reinforcing Ring 13 Rubber Part 14 Main Lip 15 Annular Groove 16 Garter Spring 17 Shaft 18 Housing 19 Adhesive

Claims (1)

[Scope of utility model registration request] 1. An oil seal having a garter spring for pressing the tip of a main lip against a shaft, wherein an adhesive is formed between the bottom of a circumferential annular groove for holding the garter spring and the garter spring. The oil seal with a garter spring is characterized by being fixed by.