KR101215001B1 - Oil seal and rotary device - Google Patents

Abstract

[PROBLEMS] Even if there is a large gap in the radial direction between the two members to be sealed, the increase in weight and parts score can be prevented as much as possible without impairing the sealing function of the lubricant.

[Solution] A grease reservoir 154 having a metal ring 156 and a lip portion 152 supported by the metal ring 156 and allowing a lubricant to be collected between the lip portion 152 and the metal ring 156. In the oil seal 150 is formed, the end of the metal ring 156 is provided with an extension portion 158 extending in the radial direction.

Metal ring, lip, grease reservoir, oil seal, extension

Description

Oil seal and rotary device

The present invention relates to the technical field of an oil seal and a rotating device having said oil seal.

This application claims priority based on Japanese Patent Application No. 2008-329815, filed December 25, 2008. All content of that application is incorporated herein by reference.

Background Art Conventionally, in industrial equipment, transportation equipment, and the like, transmissions having a structure in which a transmission mechanism such as a gear transmission mechanism or the like is housed in a casing have been frequently used. In such transmissions, a lubricant is generally enclosed in the casing to lubricate the transmission mechanism. Oil seals are used to seal lubricants. For example, the oil seal is also used for sealing a lubricating agent in the speed reducer of patent document 1, too. The oil seal has a metal ring and a lip portion supported thereon. The oil seal is fixed between the casing and the sleeve integrated with the output shaft by supporting the casing on the outer peripheral surface of the oil seal.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2002-130390

However, in patent document 1, in order to fill the large space | interval of the casing and the output shaft which is a rotating body, the sleeve which is a rigid member is attached to an output shaft, and the large space | interval of the sleeve of an output shaft and the casing is made small. For this reason, in the speed reducer employ | adopting the structure as shown by patent document 1, the speed reducer became heavy by the amount which added the sleeve which is a rigid member, and had the problem that a component score increases.

The present invention, in this respect, even if there is a large gap in the radial direction between the two members to seal without impairing the sealing function of the lubricant, the rotation having an oil seal and its oil seal that can prevent the increase in weight and parts score as much as possible The object is to provide a device.

The present invention provides an oil seal having a metal ring and a lip portion supported by the metal ring, wherein a grease reservoir is formed to allow a lubricant to be collected between the lip portion and the metal ring, the end of the metal ring having an extension extending in the radial direction. This solves the problem.

The present invention is based on the new idea that even when there is a large gap in the radial direction between the two members to seal, it prevents the leakage of lubricant at the fitting portion of the oil seal without causing an increase in weight or parts score. Conventionally, the oil seal has the function of the rigid member formed in order to reduce the large space | interval in the said radial direction, and it is comprised as an integral part.

That is, the present invention enables the oil seal to be sealed between the two members without additionally providing a sleeve, which is a rigid member, between the two members to be sealed by providing an extension portion extending radially the end of the metal ring. In other words, the increase in the part score can be minimized. At the same time, it is possible to lighten the member (rotator) on which the oil seal is mounted, as compared with the case of using a rigid member.

In the case where the lip portion is provided on the inner circumferential side of the extension portion, since the inner diameter of the lip portion can be made smaller than before, the circumferential speed at the contact surface by the lip portion is low, and power transmission loss, wear, and the like can be reduced.

In addition, by extending a portion of the member (rotator) on which the oil seal is mounted in the axial direction, the extension member does not need a positioning member for this purpose, and further increases the number of parts, thereby facilitating weight reduction. .

By applying the present invention to a rotating device, it is possible to prevent the increase in weight and the number of parts as much as possible even if there is a large gap in the radial direction between the two members to be sealed without impairing the sealing function of the lubricant.

EMBODIMENT OF THE INVENTION Hereinafter, an example of embodiment of this invention is described in detail, referring an accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram which shows an example of the rotating apparatus which concerns on 1st Embodiment of this invention, and FIG. 2 is the schematic diagram which expanded a part of oil seal similarly.

First, the structure of the rotating apparatus which concerns on embodiment of this invention is demonstrated based on FIG. In addition, since the transmission 100 of FIG. 1 is only an example of a rotating device to which an oil seal is applied, which is a feature of the present invention, the transmission 100 does not all show sufficient components as a transmission in FIG. 1.

The transmission 100 is rotatably mounted on the outer side of the hollow shaft (first member) 102, the eccentric body 106 formed on the hollow shaft 102, and the eccentric body 106 in a casing (second member). External tooth members (external tooth gears) 112, 114, internal tooth members (internal tooth gears) 116 internally engaged with external tooth members 112, 114, and external tooth members 112, 114. Is provided on one side in the axial direction O of the inner toothed planetary gear mechanism having a carrier body 122 which extracts only the rotating components of the outer tooth members 112 and 114, and grease is enclosed therein as a lubricant. It is. The casing is also composed of the support 124 of the inner tooth member 116, the stop cover 126, and the rear cover 128, and the O-rings 140 and 142 are inserted into the bolts 138 so that the lubricant does not leak. It is fixed in one piece.

The hollow shaft 102 has an opening 104 and is rotatably supported by the carrier body 122 via a bearing 130. In addition, only one bearing 130 is shown in FIG. 1, in which a motor shaft (not shown) is connected to the hollow shaft 102 and the motor shaft is supported by a bearing, so that the hollow shaft 102 is supported at two places. have.

The hollow shaft 102 is formed by integrating two eccentric bodies 106 with a phase difference of 180 degrees. Each eccentric body 106 is equipped with external tooth members 112 and 114 via bearings 108 and 110 (retainer mounting in the drawing). In addition, two external tooth members 112 and 114 are provided in parallel, thereby increasing transmission capacity, improving strength, and maintaining rotational balance.

On the outer circumference of the outer tooth members 112 and 114, an outer tooth (not shown) such as a trocoid tooth type or an arc tooth type is formed. The inner tooth member 116 is inwardly engaged with the outer tooth.

The internal tooth member 116 is rotatably supported by the support 124 in a pin shape.

The outer tooth members 112 and 114 are formed with a plurality of inner pin holes 112A and 114A at appropriate intervals in the circumferential direction, respectively, and the inner roller 118 and the inner pin 120 in the inner pin holes 112A and 114A, respectively. ) Is inserted.

The inner pin 120 is integrally formed with the carrier body 122. For this reason, the inner pin 120 is an aspect supported by the one side of the carrier body 122, and can transmit the rotating component of the outer tooth members 112 and 114 to the carrier body 122 stably without a transmission loss.

The carrier body 122 is supported by the casing of the transmission 100 via the bearing 132 (cross roller bearing in this embodiment).

Sealing of the lubricant is O-ring 140, 142, the oil seal 134 disposed outside the axial direction (O) of the bearing 130, the oil seal disposed outside the axial direction (O) of the bearing 132 136 and the oil seal 150 (described later) press-fitted to the support 124 of the internal tooth member 116 on the opposite side of the carrier body in the axial direction O. As shown in FIG.

Next, the oil seal 150 will be described with reference to FIGS. 1 and 2.

The oil seal 150 has a metal ring 156 having a parallel portion 156A parallel to the axial direction O, a lip portion 152 supported by the metal ring 156, and a lip portion 152 and a metal ring. A space (called a grease reservoir 154) is provided between the 156 to collect lubricant.

The grease reservoir 154 is formed of parallel portions 156A of the lip portion 152 and the metal ring 156 in a closed space projecting to the opposite side of the transmission, so as to be disposed in the vicinity of the seal lip portion 152B. Therefore, even when the lubricant to be sealed is scattered from the inside of the transmission 100, the lubricant can be reliably collected inside the transmission 100, and the flow of the lubricant to the seal lip 152B on the transmission side of the parallel portion 156A can be secured. It can also be buffered by the curved part 156B formed in the edge part, and it becomes possible to supply a gathered lubricant continuously to the front-end | tip of the seal lip part 152B. That is, the seal lip 152B can be extended in life by the grease reservoir 154.

The metal ring 156 is curved in the curved part 156B by press working etc. in the radial direction from the parallel part 156A parallel to the axial direction O, and has the extension part 158 extended radially outward. That is, the extension part 158 is formed from the edge part of the metal ring 156. The tip of the extension portion 158 is further bent to the side opposite to the transmission in the axial direction O by press working or the like to form the bend portion 160.

The lip portion 152 is formed of an elastic body such as a synthetic resin, and is formed of an anchoring portion 156C that is bent in an L shape radially inward from a parallel portion 156A parallel to the axial direction O of the metal ring 156. It is fixed by methods, such as sintering, so that a part may be wrapped. The lip part 152 is equipped with the dust lip part 152A and the seal lip part 152B. The dust lip 152A is auxiliary to prevent dust from entering dust or dust and does not use a spring. The seal lip portion 152B has a wedge-shaped cross-sectional shape, and when the tip portion 152BB is pressed against the outer circumferential surface of the hollow shaft 102, sealant of lubricant is realized. Further, if the tip portion 152BB forms an angle θ1 on the axial direction O and the transmission side, and an angle θ2 on the opposite side of the transmission, θ1> θ2 is established. For this reason, during the rotation of the hollow shaft 102, the tip portion 152BB of the lip 152 abutting against the hollow shaft 102 moves to the large angle θ1 side, that is, the transmission side, so that leakage of lubricant can be stably prevented. have. In the circumferential groove 152C formed on the outer circumference of the seal lip portion 152B, a spring 152D is disposed in order to stably maintain the adhesion of the seal lip portion 152B with respect to the outer circumferential surface of the hollow shaft 102.

The oil seal 150 is attached to the transmission 100 by press-fitting into the support body 124 of the internal tooth member 116 on the opposite side to the carrier body in the axial direction O, as shown in FIG. For this reason, leakage of a lubrication agent can be prevented by the press-in of the bending part 160 to the support body 124, and the seal lip part 152B. The inner tooth member 116, the outer tooth member 112, and the inner roller 118 are restricted in movement in the axial direction O by the extension 158 of the oil seal 150. That is, the extension part 158 of the oil seal 150 positions the part which comprises the transmission (rotator) 100 which is a member in which the oil seal 150 is mounted in the axial direction O. As shown in FIG.

Next, the operation of the transmission 100 will be described.

When the hollow shaft 102 rotates once, the two eccentric bodies 106 also rotate once. When the two eccentric bodies 106 rotate one time, the outer tooth members 112 and 114 also try to oscillate around the eccentric body 106. However, since the oscillation rotation is constrained by the inner tooth member 116, the outer tooth members 112 and 114 are inscribed to the inner tooth member 116 and rotate while rotating slightly.

Now, when the number of teeth of the outer tooth members 112 and 114 is N and the number of teeth of the inner tooth member 116 is N + 1, the tooth aberration is 1. For this reason, the outer tooth members 112 and 114 are shifted by one tooth relative to the inner tooth member 116 integrated with the casing every one rotation of the hollow shaft 102. That is, one rotation of the hollow shaft 102 is decelerated and transmitted as a 1 / N rotation of the outer tooth members 112 and 114.

The rotation of the outer tooth members 112 and 114 absorbs its idle component by the gap between the inner pin holes 112A and 114A and the inner roller 118, so that only the rotating component is interposed with the inner pin 120 through the carrier body. Is passed to 122.

As a result, reduction of the reduction ratio 1 / N is realized between the hollow shaft 102 and the carrier body 122. However, when the carrier body 122 is the input shaft and the hollow shaft 102 is the output shaft, the increase in the speed ratio N is realized.

In addition, the carrier body 122 may be fixed and used as a transmission shifted between the hollow shaft 102 and the casing. Alternatively, the hollow shaft 102 may be fixed to be used as a transmission shifted between the carrier body 122 and the casing.

With the rotation of the eccentric body 106, the outer tooth members 112, 114, the inner tooth member 116, and the inner roller 118 attempt to move in the axial direction O, but with the extension of the oil seal 150. Since the portion 158 abuts against the outer tooth member 112, the inner tooth member 116, and the inner roller 118, the positioning in the axial direction O is restricted. In addition, the force to move in the axial direction O of the outer tooth member 112, 114, the inner tooth member 116, the inner roller 118 is a very small force from the viewpoint of power transmission, so the pressurized oil seal ( 150 does not fall out or become a breaking force, the oil seal 150 can seal the lubricant stably. In addition, since the oil seal 150 is mounted by press-fitting, the oil seal 150 may be prevented from being pulled out even when the inside of the transmission 100 is sealed to increase the internal pressure.

At the same time, the lubricant encapsulated in the transmission 100 is scattered and dispersed in the transmission 100 with the rotation of the external tooth members 112 and 114, and some of the lubricant also moves to the oil seal 150. Lubricant that has moved to the oil seal 150 can not normally be present in the bend 160 or extension 158 and is collected in the grease reservoir 154. Since the lubricant of the grease reservoir 154 is continuously supplied to the seal lip portion 152B of the oil seal 150 as described above, the oil seal 150 can be extended in life.

That is, the oil seal 150 is provided with the extension part 158 which extended the edge part of the metal ring 156 radially outward, and it is between a casing and the hollow shaft 102 which is a rotating body (between two sealing members). It becomes possible to seal between the casing and the hollow shaft 102 without providing extra rigid member (for example, a sleeve). In other words, the increase in the number of parts can be minimized. At the same time, it is possible to lighten the transmission 100, which is a rotating device, compared with the case of using a rigid member.

And since the lip part 152 is provided in the inner peripheral side of the extension part 158, the inner diameter of the lip part 152 can be made smaller than before. For this reason, since the circumferential speed in the contact surface with the hollow shaft 102 by the lip part 152 is slow, power transmission loss, abrasion, etc. can be reduced.

In addition, the extension part 158 is an axial direction of a part (outer tooth member 112, 114, inner tooth member 116, inner roller 118) of the member (transmission 100) to which the oil seal 150 is mounted. Since the positioning of (O) is performed at the same time, the positioning member is not necessary, and the increase in the number of parts can be prevented, so that the shortening and the weight reduction in the axial direction (O) can be promoted.

That is, by applying the present invention to the transmission 100, which is a rotating device, even if there is a large gap in the radial direction between the two members to seal (casing and the hollow shaft 102) without impairing the sealing function of the lubricant, the weight and It is possible to prevent the increase in the parts score as much as possible.

Next, 2nd Embodiment which concerns on this invention is described using FIG.

In this embodiment, the rotating apparatus is the gear motor 200, specifically, the hollow shaft 102 of the transmission 100 shown in 1st Embodiment is extended to the opposite side to a carrier body, and the rotor of a motor is provided in the part. It is. In the oil seal 250, an insulator 259 is formed on the surface of the motor side. For this reason, in this embodiment, the relationship between a part of a motor part, an oil seal, and the insulator 259 of the oil seal 250 is demonstrated, and the other components make the following two digits the same as 1st embodiment, and demonstrates. Omit.

The gear motor 200 includes a motor 200A and a transmission 200B. The motor 200A has a rotor (not shown) and a stator 264 which is disposed on the radially outer side slightly away from the rotor and fixed to the motor casing 262 of the motor 200A. The hollow shaft 202, which is an input shaft of the transmission 200B, is in common with the output shaft of the motor 200A, and a rotor is formed on the outer circumference thereof. The stator 264 requires a coil 264A that has a width in the axial direction O to rotate the rotor.

Here, the oil seal 250 has a concave shape toward the transmission side in the axial direction O in relation to determining the position of components of the transmission 200B. For this reason, the coil 264A which is another member can be arrange | positioned in the recessed space. Therefore, the oil seal 250 seals the lubricant only on the transmission side, and the gear motor 200 can be shortened in the axial direction (O).

In the oil seal 250, an insulator 259 is formed on the surface of the motor side. The insulator 259 is covered from the lip part 252 to the bend part 260 continuously in a film state. For example, the insulator 259 may use an elastic body of the same material as the lip 252 when the lip 252 is fixed to the metal ring 256. For this reason, the possibility that the coil 264A and the oil seal 250 become conductive can be reduced, and the coil 264A can be arrange | positioned in the vicinity of the oil seal 250. FIG. That is, the gear motor 200 can be shortened more in the axial direction.

Although the said embodiment was mentioned and demonstrated about this invention, this invention is not limited to the said embodiment. That is, it goes without saying that the improvement and the design change in the range which do not deviate from the summary of this invention are possible.

For example, in the said embodiment, although the lip | rip parts 152 and 252 were the inner peripheral side of the metal rings 156 and 256, this invention is not limited to this. For example, the lip portion may be the outer circumferential side and the metal ring may be the inner circumferential side. In that case, the member arrange | positioned at the outer side which abuts a lip part will be a 1st member. The metal ring extends inwardly in the radial direction, and the second member is disposed inside the metal ring.

In addition, in the said embodiment, although the bending part 160,260 which bends in the axial direction O was formed in the front-end | tip of extension part 158,258, this invention is not limited to this. For example, you may arrange | position an O-ring in the middle, without forming a curved part, and may mount an oil seal to a casing with a bolt etc. from the radial direction outer side. In this case, the work and structure of the press-in can be omitted, and the freedom of design of the rotating device is improved, and the oil seal can be easily installed. In addition, the bending direction of the bend may be reversed.

Moreover, in the said embodiment, although the case where the oil seals 150 and 250 have the insulator 259 and the case where it does not have was shown, this invention is not limited to this. For example, only part of the extension part and the bent part which is a part extended from the edge part of a metal ring may be comprised or coat | covered with an elastic body (insulator). In addition, even if it is coat | covered with an insulator (elastic body), it is not limited to what is coat | covered only to the motor side in the axial direction shown by 2nd Embodiment, and either one side of the transmission side of a oil seal, the motor side, or both surfaces are coat | covered. You may be.

Moreover, in the said embodiment, although the 1st member was the hollow shafts 102 and 202, and the 2nd member was the casing (support 124), this invention is not limited to this, The 1st member and the 2nd member which rotate relative to each other are not limited to this. If it is between, it is applicable. For example, even if it is applied between the hollow shaft 102 and the carrier body 122 or the carrier body 122 and the casing (rear cover 128) to which the oil seals 134 and 136 shown in FIG. 1 are applied, do.

Moreover, although the transmission was used as a rotating apparatus in the said embodiment, this invention is not limited to this. That is, it is applicable if it is a member in which the lubricant is enclosed with the member which rotates relative to each other. Naturally, the rotating device does not have to have a gear, and for example, may have a planetary roller or the like instead of a gear.

In addition, in the said embodiment, although the lip | rip parts 152 and 252 were equipped with the dust lip | rip parts 152A and 252A, this invention is not limited to this. For example, the lip part may be comprised only by the seal lip part. This is because the present invention is not intended to exclude dust, dust and the like, but is based on the sealing of a lubricant, which is an inherent function of the oil seal.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic diagram which shows an example of the rotating apparatus which concerns on 1st Embodiment of this invention.

2 is a schematic diagram in which part of the oil seal is enlarged.

3 is a schematic diagram showing an example of a rotary device according to a second embodiment of the present invention.

* Description of the sign *

100, 200 B: transmission

102, 202: hollow shaft

104, 204 openings

106,206: Eccentric Body

108, 110, 130, 132, 208, 210, 230, 232: bearing

112, 114, 212, 214: outer tooth member

112A, 114A, 212A, 214A: Inner Pin Hole

116, 216: internal tooth member

118, 218: inner roller

120, 220: Internal pin

122, 222: carrier body

124, 224 support

126, 226: Suspension Cover

128, 228: Rear cover

134, 136, 150, 234, 236, 250: oil seal

138, 238: Bolt

140, 142, 240, 242: O-ring

152, 252: rib portion

152A: Dust Lip

152B: Seal Lip

152BB: Tip portion

152C: Perimeter Groove

152D: Spring

154, 254: Greek Repository

156, 256: metal ring

156A: Parallel

156B: Bend

156C: Fixture

158, 258: extension

160, 260: bend

200: gear motor

200A: motor

259: insulator

262: motor casing

264: Stator

264A: Coil

Claims (8)

delete delete delete A rotating device having a first member and a second member which rotate relative to each other, and an oil seal disposed between the first member and the second member, The oil seal has a lip portion in contact with the first member, a metal ring supporting the lip portion, and a grease reservoir is formed to allow a lubricant to be collected between the lip portion and the metal ring, An end portion of the metal ring extending in the radial direction, and a bend portion axially bent from the tip of the extension portion, and the member constituting the rotating device in the extension portion is positioned in the axial direction, The motor is connected to the rotating device, the coil of the motor is disposed inside the bent portion Rotator characterized in that. delete The method of claim 4, Insulators formed on at least one surface of the extension part Rotator characterized in that. delete delete

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