JP4466903B2 - Rotating body and reducer - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotating body and a speed reducer having a seal member.
[0002]
[Prior art]
Conventionally, in a power transmission device such as a speed reducer, one oil seal is used to seal a lubricant. However, since the sealing performance cannot be maintained with only one oil seal, there is a conventional sealing device in which a plurality of oil seals are arranged in parallel in the axial direction to seal pressure water, lubricant, and the like. (For example, refer to Patent Document 1 below). Further, when the lubricant is sealed in the power transmission device, for example, there is a sealing device as shown in FIG. The sealing device of FIG. 5 has two oil seals 51, 52 in the axial direction so that the lubricant does not flow out from the bearing 50 side disposed between the rotating portion 53 that rotates with respect to the fixed portion 54 and the fixed portion 54. The arrangement prevents the lubricant from flowing out twice. However, since such a conventional sealing device uses two oil seals, there is a problem in that the length in the axial direction becomes long and the rotating body applied to a reduction gear or the like becomes large.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 8-338535
[Problems to be solved by the invention]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a rotating body and a speed reducer that can improve the sealing performance against pressure water, a lubricant, and the like and can be downsized.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a rotating body according to the present invention includes a fixed portion, a rotating portion that rotates with respect to the fixed portion, and an angular ball bearing or a cone provided between the fixed portion and the rotating portion. A roller bearing; and a seal member disposed in the vicinity of the bearing so as to seal between the fixed portion and the rotating portion, and having a main lip and an auxiliary lip, and the bearing is orthogonal to the rotation axis Bearing end surfaces of the inner ring and the outer ring are arranged so as to support the load in the rotation axis direction at the step portion provided at the rotating portion and the step portion provided at the fixed portion, respectively, and the seal member includes the main lip. A first reinforcing ring member having an L-shaped cross section to which the first elastic portion constituting the same is fixed, and a second elastic portion constituting the auxiliary lip is fixed and provided on the inner peripheral portion of the first reinforcing ring member. Second reinforcement rib with L-shaped cross section Comprising grayed and the member, and further, the seal member, the main lip the rotating unit sliding contact and the like auxiliary lip slides over the bearing edge which supports the load at the stepped portion provided on the rotating portion It is comprised by these.
[0006]
According to this rotating body, since the seal member is in sliding contact with the rotating portion at the main lip and is in sliding contact with the bearing end surface orthogonal to the rotation axis of the bearing with the auxiliary lip, the sealing performance against pressure water, lubricant, etc. can be improved. it can. Such an improvement in sealing performance can be realized with a single sealing member, so the number of sealing members can be reduced and the rotating body can be reduced in size.
[0007]
In the rotating body, it is preferable that the auxiliary lip is in sliding contact with the bearing end surface of the inner ring of the bearing. In addition, by utilizing the bearing end face that is normally hardened and processed with high precision as the portion where the auxiliary lip is in sliding contact, the auxiliary lip can effectively prevent leakage of the lubricant, and the sliding contact portion of the auxiliary lip can be prevented. There is no particular need for processing, which is advantageous in terms of component costs and can contribute to cost reduction.
[0008]
The seal member, the main and first reinforcing ring member of L-shaped cross-section in which the first elastic portion is fixed which constitutes a lip, said second elastic portion constituting the auxiliary lip is fixed and the first reinforcing ring It is preferable to include a second reinforcing ring member having an L-shaped cross section provided on the inner peripheral portion of the member.
[0009]
The seal member preferably includes a reinforcing ring member to which elastic portions constituting the main lip and the auxiliary lip are fixed, and the auxiliary lip is preferably formed integrally with the main lip.
[0010]
In addition, the auxiliary lip is configured to face outward in the radial direction of the rotating part, so that it is difficult to open by the pressure from inside the rotating part. Also. In order to remove dust from the outside, it is preferable to include a dust lip provided outside the main lip and in sliding contact with the rotating portion.
[0011]
A speed reducer according to the present invention includes the above-described rotating body, and the rotating portion rotates while being decelerated by a rotational force input to the speed reducer. According to this speed reducer, the sealing performance against the internal lubricant and pressure water can be improved and downsizing can be realized.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0013]
<First Embodiment>
[0014]
FIG. 1 is a cross-sectional view showing an eccentric oscillating type speed reduction mechanism of a speed reducer according to the present embodiment, and FIG. 2 is a partially enlarged cross-sectional view showing a seal member arranged in the seal portion of FIG.
[0015]
As shown in FIG. 1, the speed reducer according to the present embodiment includes a fixed member 1, a rotating member 2 that rotates with respect to the fixed member 1, and a rolling bearing 3 that is disposed between the fixed member 1 and the rotating member 2. , 4 and a seal member 5 disposed in the seal portion 6 in the vicinity of the bearing 3 so as to seal between the fixed member 1 and the rotary member 2. A rotating body is composed of the fixed member 1, the rotating member 2, and the like.
[0016]
The speed reducer of FIG. 1 has a known eccentric oscillating speed reduction mechanism, and is provided on a plurality of eccentric shafts 11 to which a rotational force on the input side is transmitted by an input spur gear 12 and an inner peripheral portion of the fixed member 1. The internal gear 15 composed of a plurality of pins (internal teeth), and the internal gear 15 has, for example, external teeth having a different number of teeth from the internal gear 15 at a predetermined pitch corresponding to the internal gear 15 and meshes with the internal gear 15. External gears 13 and 14, and a hollow portion 16 that accommodates a drive shaft having a pinion that transmits rotation from a motor or the like and meshes with the input spur gear 12, electrical wiring, and the like at the center.
[0017]
The eccentric shaft 11 eccentrically supports the external gears 13 and 14 with respect to the central axis of the internal gear 15 via bearing pins 13a and 14a so as to be capable of revolving motion. The rotating member 2 is rotatably coupled to the fixed member 1 via rolling bearings 3 and 4, and supports both ends of the eccentric shaft 11 rotatably via bearings 11a and 11b. In order to smoothly drive the meshing portion of the external gears 13 and 14 and the internal gear 15 in the rotating member 2, a lubricant is filled.
[0018]
At least one of the plurality of eccentric shafts 11 is rotated by the rotational force of the input side motor or the like being transmitted via the input spur gear 12 mounted on the end of the shaft, whereby the external gears 13 and 14 are rotated. Meshes with the internal gear 15 having, for example, one tooth number larger than the number of teeth of the external gears 13 and 14 while revolving. The external gears 13 and 14 rotate in accordance with the difference in the number of teeth per revolution (1), whereby the rotating member 2 rotates at a reduced speed corresponding to the rotation of the external gears 13 and 14 together with the internal gear 15. To do. In this way, the rotational force on the input side can be transmitted via the input spur gear 12 and the deceleration output can be taken out. For example, the external rotation shaft connected to the shaft 17 on the output side of the rotating member 2 can be decelerated. Can be rotated.
[0019]
As shown in FIGS. 1 and 2, the rolling bearing 3 provided between the fixed member 1 and the rotating member 2 and on the input spur gear 12 side includes an inner ring 3a, an outer ring 3b, and a rolling element 3c. The inner ring 3a and the outer ring 3b of the rolling bearing 3 are made of a metal material such as bearing steel and are usually subjected to quench hardening even in a commercial product. Further, the inner peripheral surface of the inner ring 3a, the end surface 3d of the inner ring 3a orthogonal to the rotation axis of the bearing 3, the outer peripheral surface of the outer ring 3b, and the end surface of the outer ring 3b orthogonal to the rotation axis are used to increase the accuracy of the bearing. Even commercial products are usually polished with high precision.
[0020]
The bearing 3 in FIGS. 1 and 2 is an example in which a pair of angular ball bearings are combined in the back, but may be combined in the front. The bearing may be a tapered roller bearing.
[0021]
As shown in FIG. 2, the seal member 5 includes a first reinforcing metal ring 31 having a L-shaped cross section made of a metal material, and a first elasticity made of a rubber material or the like integrally baked and fixed to the first reinforcing metal ring 31. A body 32 and a second reinforcing metal ring 33 having an L-shaped cross section made of a metal material fitted to the inner peripheral portion of the first reinforcing metal ring 31.
[0022]
The 1st elastic body 32 removes the dust from the fitting part 32c fitted to the fixing member 1, the main lip 32b which slidably contacts the rotating surface 20 of the rotating member 2, and the reducer of FIG. For this purpose, a dust strip 32a provided outside the main lip 32b and in sliding contact with the rotating surface 20 is provided. The main lip 32b is pressed against the rotating surface 20 by a linear spring member 34 provided on the outer peripheral side thereof.
[0023]
The seal member 5 further includes an auxiliary lip 35 made of an elastic body such as a rubber material and fixed to the inner peripheral end of the second reinforcing metal ring 33 as a second elastic body. Therefore, since the gear wear powder generated from the inside of the reduction gear does not reach the main lip 32b, the seal life can be improved. The auxiliary lip 35 of the second elastic body is in sliding contact with the end surface 3d of the inner ring 3a orthogonal to the rotation axis of the bearing 3 so as to face the outer side in the radial direction of the rotating member 2. Therefore, it is possible to receive the operating pressure in the speed reducer generated by the swinging motion of the external gears 13 and 14.
[0024]
As shown in FIGS. 1 and 2, according to the seal member 5 disposed in the seal portion 6 between the fixed member 1 and the rotating member 2, the main lip 32 b is in sliding contact with the rotating surface 20 of the rotating member 2 and is assisted. The lip 35 is slidably contacted with the end surface 3d orthogonal to the rotation axis of the inner ring 3a of the bearing 3 to seal in two stages, whereby the sealing performance of the seal member 5 can be improved and the lubricant filled in the rotary member 2 can be improved. Leakage can be prevented.
[0025]
Further, in the present embodiment, since the number of seal members 5 is small compared to the conventional example of FIG. 5, the axial length of the rotating body including the fixed member 1 and the rotating member 2 can be configured to be short. The body can be downsized, and the speed reducer composed of such a rotating body can be downsized.
[0026]
Further, the auxiliary lip 35 of the seal member 5 can be effectively prevented from leaking the lubricant by slidingly contacting the end surface 3d of the inner ring 3a of the bearing 3 which has been hardened and processed with high precision in advance, and the auxiliary lip 35 is in sliding contact. There is no need to particularly process the sliding contact portion, which is advantageous in terms of component costs, and can contribute to the cost reduction of the seal member 5.
[0027]
Further, since the auxiliary lip 35 is formed so as to face outward in the radial direction of the rotating member 2, it is difficult to open by the pressure from inside the rotating member 2 (lubricant filling side).
[0028]
Note that another seal member may be interposed between the first reinforcing metal ring 31 and the second reinforcing metal ring 33 of the seal member 5. This prevents the lubricant from passing through the auxiliary lip 35 and passing between the first reinforcing metal ring 31 and the second reinforcing metal ring 33 and reaching the main lip. Further, the bearing 4 side is hermetically sealed with a lid member (not shown), so there is no need to arrange a seal member as shown in FIG. When the lid member is not coupled, the seal member 5 may be provided also on the bearing 4 side.
[0029]
1 and 2 as described above, for example, when the shaft 17 on the output side is exposed to a vacuum part of a vacuum chamber of a semiconductor manufacturing apparatus or the like, a high seal is provided to maintain a high degree of vacuum in the vacuum chamber. However, as described above, the single seal member 5 can effectively seal the filler inside the speed reducer to prevent the leakage of the filler, and the air flow from the atmosphere side can be prevented. This can contribute to maintaining a high degree of vacuum in the vacuum chamber.
[0030]
<Second Embodiment>
[0031]
FIG. 3 is a partially enlarged cross-sectional view similar to FIG. 2 showing the seal member of the second embodiment disposed in the seal portion of FIG.
[0032]
In the second embodiment, the seal member 40 is different from that of FIG. 2 only in that an auxiliary lip is formed at the tip of the main lip of the first elastic body. Description is omitted. The seal member 40 according to the second embodiment is disposed in the seal portion 6 between the fixed member 1 and the rotary member 2 of the reduction gear of FIG.
[0033]
As shown in FIG. 3, the seal member 40 includes an auxiliary lip 41 that is integrally formed on the distal end side of the main lip 32 b of the first elastic body 32. As in FIG. 2, the auxiliary lip 41 is in sliding contact with an end surface 3d orthogonal to the rotation axis of the inner ring 3a of the bearing 3 that has been hardened and processed with high precision in advance.
[0034]
According to the seal member 40 in FIG. 3, the main lip 32 b is in sliding contact with the rotating surface 20 and the auxiliary lip 41 is in sliding contact with the end surface 3 d of the bearing 3 in the seal portion 6 between the fixed member 1 and the rotating member 2. By sealing in two stages, the sealing performance of the sealing member 40 can be improved, leakage of the lubricant filled in the rotating member 2 can be prevented, and the same effects as in FIGS. 1 and 2 can be obtained.
[0035]
Further, the auxiliary lip 41 of FIG. 3 is formed so as to face the outer side in the radial direction of the rotating member 2 as in FIG. 2, and is difficult to open by the pressure from the inside of the rotating member 2. Further, the auxiliary lip 41 may be formed anywhere as long as it can slide on the end surface 3d orthogonal to the rotation axis of the inner ring 3a of the bearing 3, for example, from the base of the main lip 32b in the first elastic body 32. Good.
[0036]
<Third Embodiment>
[0037]
FIG. 4 is a partially enlarged cross-sectional view similar to FIG. 2 showing the seal member of the third embodiment arranged in the seal portion of FIG.
[0038]
In the third embodiment, the seal member 45 differs from FIG. 3 only in that the auxiliary lip formed at the tip of the main lip of the first elastic body is directed inward in the radial direction. The same reference numerals are given to the components, and the description thereof is omitted. The seal member 45 according to the third embodiment is disposed in the seal portion 6 between the fixed member 1 and the rotating member 2 of the reduction gear of FIG. An O-ring 10 is fitted in an O-ring groove 2a formed on the outer periphery of the rotating member 2 facing the inner ring 3a. Therefore, even when there is a gap between the rotating member 2 and the inner ring 3a, oil or air pressure in the reduction gear is prevented from flowing out toward the oil seal member 45.
[0039]
As shown in FIG. 4, the seal member 45 has an auxiliary lip 46 that is integrally formed on the distal end side of the main lip 32 b of the first elastic body 32. As in FIG. 2, the auxiliary lip 46 is in sliding contact with an end surface 3d orthogonal to the rotation axis of the inner ring 3a of the bearing 3 that has been previously hardened and processed with high precision. The auxiliary lip 46 is formed so as to face the inner side in the radial direction of the rotating member 2.
[0040]
According to the seal member 45 of FIG. 4, the main lip 32 b is in sliding contact with the rotating surface 20 and the auxiliary lip 46 is in sliding contact with the end surface 3 d of the bearing 3 in the seal portion 6 between the fixed member 1 and the rotating member 2. By sealing in two stages, the sealing performance of the sealing member 40 can be improved, leakage of the lubricant filled in the rotating member 2 can be prevented, and the same effects as in FIGS. 1 and 2 can be obtained.
[0041]
Further, as shown in FIG. 4, configuring the auxiliary lip 46 of the seal member 45 so as to face the inner side in the radial direction of the rotating member 2 can be applied when the pressure in the rotating member 2 is small. In the first and second embodiments, an O-ring may be provided between the bearing inner ring 3a and the rotating member 2 as in the third embodiment.
[0042]
As described above, the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made within the scope of the technical idea of the present invention. For example, the rotating body constituted by the fixing member, the rotating member, the seal member and the like according to the present invention can be applied not only to the speed reducer but also to other power transmission devices such as a gear type and a friction type.
[0043]
Further, in the present embodiment, the outer member of the rotating body in FIG. 1 is the fixed portion and the inner member is the rotating portion. However, the present invention is not limited to this, and in FIG. The member may be a fixed part and the outer member may be a rotating part.
[0044]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the rotary body and speed reducer which can improve the sealing performance with respect to pressure water, a lubricant, etc. and can be reduced in size can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an eccentric oscillating speed reduction mechanism of a speed reducer according to a first embodiment.
FIG. 2 is a partially enlarged cross-sectional view showing a seal member disposed in the seal portion of FIG.
FIG. 3 is a partially enlarged cross-sectional view similar to FIG. 2, showing a seal member according to a second embodiment disposed in the seal portion of FIG.
4 is a partially enlarged cross-sectional view similar to FIG. 2, showing a seal member according to a third embodiment disposed in the seal portion of FIG. 1;
FIG. 5 is a partially enlarged cross-sectional view of a sealing device made of a conventional sealing member.
[Explanation of symbols]
1 ... Fixing member (fixing part)
2 ... Rotating member (rotating part)
DESCRIPTION OF SYMBOLS 3 ... Rolling bearing 3a ... Inner ring 3b ... Outer ring 3d ... End surface 5 ... Seal member 6 ... Seal part 20 ... Rotating surface 31 of a rotating member ... 1st reinforcement metal Ring 32 ... first elastic body 33 ... second reinforcing metal ring 32a ... dust lip 32b ... main lip 35 ... auxiliary lips 40, 45 ... seal members 41, 46 ... Auxiliary lip

Claims (3)

A fixed part;
A rotating part that rotates relative to the fixed part;
An angular ball bearing or a tapered roller bearing provided between the fixed portion and the rotating portion;
A seal member disposed in the vicinity of the bearing so as to seal between the fixed portion and the rotating portion, and having a main lip and an auxiliary lip;
The bearings are arranged so that the bearing end surfaces of the inner ring and the outer ring orthogonal to the rotation axis support the load in the rotation axis direction at the step provided on the rotating part and the step provided on the fixed part, respectively.
The seal member includes a first reinforcing ring member having an L-shaped cross section to which a first elastic portion constituting the main lip is fixed, and a second elastic portion constituting the auxiliary lip is fixed to the first reinforcing ring. A second reinforcing ring member having an L-shaped cross section provided on the inner peripheral portion of the member,
Further, the seal member is configured such that the main lip is in sliding contact with the rotating portion and the auxiliary lip is in sliding contact with a bearing end surface supporting the load at the step portion provided in the rotating portion. Rotating body characterized. The rotating body according to claim 1 , wherein the auxiliary lip is in sliding contact with the bearing end surface of the inner ring of the bearing. A rotating body according to claim 1 or 2, speed reducer, characterized in that rotates while decelerating by the rotational force of the rotating portion is inputted.

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