JP4917778B2 - Coreless seal for shell roller bearing assembly - Google Patents

Description

  The present invention relates to a coreless seal, and more particularly to a coreless seal for shell-type roller bearing incorporation that is incorporated in a shell-type roller bearing.

  There is a throttle valve device as a device for controlling the amount of air flowing into an automobile engine or the like. A schematic diagram of an example of a throttle valve device is shown in FIG. Referring to FIG. 5, a throttle valve device 91 includes a throttle body 94 that forms an intake passage therein, a throttle blade 95 that adjusts the intake air amount by opening and closing, a throttle shaft 93 that fixes the throttle blade 95, and a throttle shaft. And a shell-type roller bearing 92 that rotatably supports 93. Here, the shell-type roller bearing 92 is used as a bearing for supporting the throttle shaft 93 because the outer diameter of the bearing is smaller than that of a ball bearing or the like, and a seal with high sealing performance can be incorporated inside. By having air leakage prevention performance.

  The throttle valve device 91 rotates the throttle shaft 93 with a wire, a motor (not shown) or the like via a gear, thereby opening and closing the throttle blade 95 and adjusting the intake air amount. The shell roller bearing 92 is press-fitted into an inner diameter hole provided in the throttle body 94 and fixed.

  Here, the above-described shell-type roller bearing that supports the throttle shaft is provided with a seal in order to prevent air leakage with the throttle shaft.

  FIG. 6 is a cross-sectional view showing a part of a conventional free state seal of a shell-type roller bearing built-in cored bar incorporated in a shell-type roller bearing. In FIG. 6, the outer diameter surface of the throttle shaft (not shown) located on the inner diameter side of the shell-type roller bearing built-in seal with a metal core is indicated by a two-dot chain line. In this specification, the free state refers to a state where the throttle shaft and the shell-type roller bearing are not incorporated. Referring to FIG. 6, shell-shaped roller bearing built-in cored seal 101 includes an annular member 102 having elasticity and a cored bar 103 made of a metal member. The cored seal 101 with a built-in core roller bearing is provided with the core 103, so that rigidity can be ensured, and heat shrinkage does not occur at low temperatures.

  The outer diameter dimension X of the cored seal 101 for incorporating a shell roller bearing is a dimension obtained by adding a fastening allowance 2Y to the inner diameter dimension C of the shell-shaped outer ring to be incorporated. By providing the tightening allowance Y, the outer diameter surface 104 of the seal 101 with the cored roller for incorporating the shell roller bearing comes into nip contact with the inner diameter surface of the inner diameter hole at an appropriate pressure when being inserted into the inner diameter hole. It is possible to prevent leakage between the shell-type roller bearing built-in cored seal 101 and the shell-type roller bearing. Further, the seal 101 with the cored bar for incorporating the shell roller bearing is provided with a lip portion 105 protruding toward the inner diameter side. The inner diameter dimension Z of the lip portion 105 is configured to be smaller than the outer diameter dimension E of the throttle shaft. In this way, when the lip portion 105 is attached to the throttle shaft, the lip portion 105 nips on the outer diameter surface of the throttle shaft with an appropriate pressure, and leakage between the seal 101 with the core metal for incorporating the shell roller bearing and the throttle shaft occurs. Can be prevented.

  Next, the case where the above-described seal 101 with the core roller for incorporating the shell roller bearing is incorporated into the shell roller bearing will be described. FIG. 7 is a sectional view showing a shell-type roller bearing 111 including a seal 101 with a cored bar for incorporating a shell-type roller bearing, and shows a seal 101 with a cored bar for incorporating a shell-type roller bearing in a free state before assembling. Show. Referring to FIG. 7, shell-shaped roller bearing 111 includes shell-shaped outer ring 112, a plurality of rollers 113, a cage 114, and a seal 101 with a core metal for incorporating a shell-shaped roller bearing. A seal 101 with a cored bar for incorporating a shell-type roller bearing is incorporated and provided between the shell-type outer ring 112 and the throttle shaft. Here, the inner diameter surface 115 of the shell-shaped outer ring 112, the outer diameter surface 104 of the shell-shaped seal 101 with the core metal for incorporating the shell roller bearing, and the outer diameter surface of the throttle shaft and the lip portion 105 are nipped with an appropriate pressure. There is no leakage between the shell-shaped outer ring 112 and the throttle shaft.

  However, since the seal 101 with the core roller for incorporating the shell roller bearing is composed of a plurality of members, the cost is increased. Further, since the cored seal 101 for incorporating the shell roller bearing has rigidity, it is difficult to remove it after being incorporated into the shell roller bearing.

  In order to solve such a problem, Japanese Unexamined Patent Application Publication No. 2004-293618 (Patent Document 1) discloses a coreless seal that is incorporated in a shell-type roller bearing and does not have a cored bar as a constituent material. According to Patent Document 1, the coreless seal for assembling the shell-type roller bearing is composed of only an elastic member, so that the cost is low and it is easy to remove even after being incorporated into the shell-shaped roller bearing. is there.

Here, the coreless seal for incorporating the shell roller bearing will be described. FIG. 8 is a cross-sectional view showing a part of a coreless seal for assembling a shell roller bearing. Referring to FIG. 8, shellless roller bearing built-in coreless seal 106 is composed of only an annular member 107 having elasticity. The size of the coreless seal 106 for incorporating the shell roller bearing is the same as that of the above-described seal 101 with the cored roller for incorporating the shell roller bearing, and the outer diameter X is set to the inner diameter C of the inner diameter hole 2Y. The inner diameter dimension Z of the lip portion 108 is smaller than the outer diameter dimension E of the throttle shaft.
Japanese Unexamined Patent Publication No. 2004-293618 (paragraph numbers 0018 to 0026, FIG. 2)

  As described above, the coreless seal 106 for the shell-type roller bearing built-in composed of only the elastic member is formed between the shell-shaped outer ring and the throttle shaft at room temperature, as described above. When assembled in between, leakage between them can be prevented. However, at the time of low temperature, the coreless seal 106 for incorporating the shell roller bearing does not have the dimensional relationship described above, and thus cannot prevent leakage therebetween.

  This will be described with reference to FIG. FIG. 9 is a part of a sectional view showing a state in which the coreless seal 106 for incorporating the shell roller bearing into the shell roller bearing 111 is incorporated at a low temperature. In addition, the coreless seal 106 for incorporating the shell roller bearing at normal temperature is indicated by a dotted line. Referring to FIG. 9, the coreless seal 106 for incorporating the shell-type roller bearing shrinks in the direction indicated by the arrow W at a low temperature, so that the outer diameter dimension changes from X to X ′. It becomes smaller than the inner diameter dimension C of the inner diameter surface 115. Then, when incorporated in the shell-shaped roller bearing 111, the inner diameter surface 115 of the shell-shaped outer ring 112 and the outer diameter surface 109 of the coreless seal 106 for incorporating the shell-shaped roller bearing are not nipped, and a gap V is generated between them. It will be. If there is such a gap V, leakage between the shell-shaped roller bearing 111 and the throttle shaft will occur.

  Further, since the inner diameter side lip portion 108 contracts in the direction indicated by the arrow W, the inner diameter dimension of the lip portion 108 is changed from Z to Z ′, and the lip portion 108 is located on the inner diameter side. Then, the amount of nip increases, the amount of biting with the throttle shaft increases, and at the time of rotation, the throttle shaft and the coreless seal 106 for incorporating the shell roller bearing rotate together, and the sealing performance may be impaired. There is.

  An object of the present invention is to provide a coreless seal for incorporating a shell-type roller bearing having high sealing performance even at low temperatures.

  The coreless seal for incorporating a shell-type roller bearing according to the present invention is incorporated in a shell-type roller bearing including a shell-type outer ring and a plurality of rollers, and prevents fluid leakage. Here, the outer diameter of the coreless seal for assembling the shell roller bearing has a tightening allowance in consideration of the amount of heat shrinkage.

  With this configuration, the coreless seal for the built-in shell-type roller bearing, which is arranged between the rotating shaft supported by the shell-type roller bearing and the shell-type outer ring, is thermally shrunk at low temperatures. Even if the outer diameter is reduced, the outer diameter of the coreless seal for incorporating the shell roller bearing is larger than the inner diameter of the inner surface of the shell outer ring. There is no gap between the outer diameter surface and the inner diameter surface of the shell type outer ring. Therefore, even at a low temperature, the outer diameter surface of the coreless seal for shell roller bearing incorporation and the inner diameter surface of the shell outer ring can be nipped with an appropriate pressure.

  Preferably, if the dimension in the radial direction of the allowance considering the amount of heat shrinkage is A, and the outer diameter dimension of the coreless seal for incorporating the shell roller bearing in a free state at room temperature is B, 0.005B ≦ A relationship of A ≦ 0.030B is established. If A is set to 0.005B or more, it is possible to secure a minimum tightening allowance dimension in consideration of the amount of heat shrinkage. Further, if A is 0.030B or less, the size of the tightening allowance will not be increased more than necessary, and the incorporation into the shell-type roller bearing becomes easy.

  More preferably, if the inner diameter dimension of the shell-shaped outer ring is C, the relationship of 0.950B ≦ C ≦ 0.985B is established. By doing so, it is possible to take an optimum dimension in the dimensional relationship with the shell-shaped outer ring that hardly requires heat shrinkage.

  More preferably, assuming that the inner diameter dimension of the coreless seal for incorporating the shell roller bearing in a free state at normal temperature is D and the outer diameter dimension of the rotating shaft supported by the shell roller bearing is E, E <D The relationship <E + 2A is established. By doing so, the inner diameter dimension of the lip portion can be made smaller than the outer diameter dimension of the rotating shaft when assembled at normal temperature. Further, even at low temperatures, it is possible to suppress biting of the coreless seal for incorporating the shell roller bearing into the rotating shaft.

  According to the present invention, even when the coreless seal for incorporating a shell-type roller bearing incorporated into a shell-shaped roller bearing at a low temperature is thermally contracted and the outer diameter is reduced, the coreless seal for incorporating a shell-type roller bearing is reduced. Is larger than the inner diameter of the inner surface of the shell-shaped outer ring. Then, there is no gap between the outer diameter surface of the coreless seal for assembling the shell type roller bearing and the inner diameter surface of the shell type outer ring. Therefore, even at a low temperature, the outer diameter surface of the coreless seal for shell roller bearing incorporation and the inner diameter surface of the shell type outer ring can be nipped with an appropriate pressure.

  As a result, it is possible to provide a coreless seal for incorporating a shell-type roller bearing having high sealing performance even at low temperatures.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a cross-sectional view showing a part of the shell-shaped roller bearing built-in coreless seal 11 according to an embodiment of the present invention in a free state at room temperature. Referring to FIG. 2, the coreless seal 11 for assembling the shell roller bearing is composed only of an annular member 12 having elasticity. The outer diameter dimension B of the coreless seal 11 for incorporating the shell roller bearing is a dimension obtained by adding a tightening allowance 2A in consideration of the amount of heat shrinkage to the inner diameter dimension C of the shell type outer ring. Further, the inner diameter dimension D of the coreless seal 11 for incorporating the shell roller bearing in which the lip portion 14 protruding toward the inner diameter side is located is the outer diameter dimension E of a rotating shaft (not shown) supported by the shell roller bearing. It is configured slightly larger than.

  Here, in the dimensional relationship described above, 0.005B ≦ A ≦ 0.030B is preferable. When A is 0.005B or more, a minimum fastening allowance at a low temperature can be secured. Further, if A is 0.030B or less, the size of the tightening allowance is not increased more than necessary, so that the assembly becomes easy. Moreover, it is good also as 0.950B <= C <= 0.985B. By doing so, the outer diameter dimension B can be defined in relation to the inner diameter dimension C of the shell-shaped outer ring that hardly needs to consider heat shrinkage. Furthermore, it is good also as E <D <E + 2A. When D is larger than E, the amount of biting with the rotating shaft can be made appropriate at the time of incorporation in consideration of shrinkage at low temperatures. If D is smaller than E + 2A, the lip portion can bite against the rotating shaft when assembled.

  Next, the state where the above-described coreless seal 11 for incorporating a shell roller bearing is incorporated into a shell roller bearing provided in a throttle valve device will be described. FIG. 1 is a cross-sectional view showing a part of a shell-type roller bearing provided with a coreless seal 11 for incorporating a shell-type roller bearing. In FIG. 1, the outline of the coreless seal 11 for incorporating the shell roller bearing in a free state at a low temperature is indicated by a dotted line, and the outline of the coreless seal 11 for incorporating the shell roller bearing in a free state at a normal temperature. Shown with a dashed line. Referring to FIG. 1, shell-shaped roller bearing 21 supports a throttle shaft (not shown) as a rotating shaft located on the inner diameter side thereof. The shell-type roller bearing 21 includes a shell-type outer ring 22 having a raceway surface on an inner diameter surface 25, a plurality of rollers 23, a cage 24 that holds the plurality of rollers 23, and a coreless seal for incorporating the shell-type roller bearing. 11. The shell-shaped outer ring 22 has a flange portion 26 whose edge bent portion extends radially inward.

  A coreless seal 11 for incorporating a shell-type roller bearing, which is a constituent member of the shell-type roller bearing 21, is disposed between the throttle shaft and the shell-type outer ring 22, and is incorporated. The position in the axial direction of the coreless seal 11 for incorporating the shell roller bearing is between the cage 24 and the flange 26.

  Here, the built-in state at normal temperature will be described first. The outer diameter dimension B of the coreless seal 11 for incorporating the shell roller bearing is a dimension obtained by adding a tightening allowance 2A to the inner diameter dimension C of the inner diameter surface 25 of the shell outer ring 22. Therefore, on the outer diameter side, the inner diameter surface 25 of the shell-shaped outer ring 22 and the outer diameter surface 13 of the coreless seal 11 for incorporating the shell roller bearing can be nipped with an appropriate pressure. On the inner diameter side, the inner diameter dimension D of the lip portion 14 is larger than the outer diameter dimension E of the throttle shaft in a free state. However, when incorporated between the shell-shaped outer ring 22 and the throttle shaft, the coreless seal 11 for incorporating the shell-shaped roller bearing contracts. Therefore, since the inner diameter when assembled between the throttle shaft and the shell-shaped outer ring 22 is smaller than the outer diameter E of the throttle shaft, the lip portion 14 can be nipped with the throttle shaft at an appropriate pressure. it can.

  Next, an assembled state at a low temperature will be described. On the outer diameter side, the annular member 12 contracts in the direction of arrow W in FIG. 1, so the outer diameter dimension of the coreless seal 11 for incorporating the shell roller bearing becomes smaller from B to B ′. However, since the outer diameter dimension B is provided with a tightening allowance A in consideration of the amount of heat shrinkage in advance, the coreless seal 11 for incorporating the shell roller bearing after the shrinkage has an outer diameter dimension B ′. Has a fastening allowance A ′. Therefore, even at a low temperature, a nip should be carried out with an appropriate pressure without generating a gap between the inner diameter surface 25 of the shell-shaped outer ring 22 and the outer diameter surface 13 of the coreless seal 11 for incorporating the shell-shaped roller bearing. Can do. On the inner diameter side, the inner diameter dimension of the lip portion 14 also decreases from D to D '. However, it is only slightly smaller than the outer diameter dimension E of the throttle shaft, and can be nipped with the outer diameter surface 27 of the throttle shaft with an appropriate pressure without increasing the amount of biting on the throttle shaft.

  From the above, even at low temperatures, the outer diameter and inner diameter can be nipped with moderate pressure, and there is no core metal for shell type roller bearings with high sealing performance between the shell type roller bearing and the throttle shaft. A seal can be provided.

  With respect to the coreless seal for the shell type roller bearing incorporated into such a shell type roller bearing, it may be incorporated on one flange side of the shell type outer ring or may be incorporated on both flange sides. Good. FIG. 3 is a cross-sectional view of a shell-type roller bearing when a coreless seal for incorporating a shell-type roller bearing is incorporated on one flange side. Referring to FIG. 3, the shell-type roller bearing 31 incorporates a core-type seal 34 for incorporating a shell-type roller bearing into the one flange 33 side of the shell-type outer ring 32. By carrying out like this, the leak by the side of one collar 33 can be prevented. FIG. 4 is a cross-sectional view of a shell-type roller bearing when a coreless seal for incorporating a shell-type roller bearing is incorporated on both flange sides. Referring to FIG. 4, shell-shaped roller bearing 36 incorporates coreless seals 39 a and 39 b for incorporating shell-shaped roller bearings on both flange portions 38 a and 38 b side of shell-shaped outer ring 37. By doing so, it is possible to prevent leakage on the side of both flanges 38a, 38b.

  In the above embodiment, the shell-type roller bearing includes the cage. However, the present invention is not limited thereto, and may be a so-called full-roller type shell-type roller bearing that does not include the cage. .

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The coreless seal for incorporating a shell roller bearing according to the present invention has a high sealing property even at low temperatures, and is therefore used in a throttle valve device or the like that is used in a low temperature environment and requires high air leakage prevention performance. It is incorporated into shell roller bearings and is used effectively.

It is sectional drawing which shows a part of shell-shaped roller bearing incorporating the coreless seal for shell-shaped roller bearing incorporation which concerns on one Embodiment of this invention. It is sectional drawing which shows a part of coreless seal | sticker for shell-type roller bearing incorporation in the free state at the normal temperature. FIG. 4 is a cross-sectional view of a shell-type roller bearing in which a coreless seal for incorporating a shell-type roller bearing is incorporated on one flange side. FIG. 4 is a cross-sectional view of a shell-type roller bearing in which a coreless seal for incorporating a shell-type roller bearing is incorporated on both flange sides. It is the schematic of a throttle valve apparatus. It is sectional drawing which shows a part of conventional seal | sticker with a core metal for shell-shaped roller bearing incorporation. It is sectional drawing which shows a part of the state which integrated the seal with the core metal for the conventional shell roller bearing incorporation in the shell roller bearing. It is sectional drawing which shows a part of conventional coreless seal for shell-shaped roller bearing incorporation. It is sectional drawing which shows a part of the state which integrated the coreless seal | sticker for shell type roller bearing incorporation in the past at the time of low temperature in the shell type roller bearing.

Explanation of symbols

  11, 34, 39a, 39b Non-core seal for shell roller bearing assembly, 12 annular member, 13, 27 outer diameter surface, 14 lip, 21, 31, 36 shell type roller bearing, 22, 32, 37 shell type Outer ring, 23 rollers, 24 cage, 25 inner surface, 26, 33, 38a, 38b collar.

Claims (4)

In a shell-type roller bearing including a shell-shaped outer ring having a flange portion with a flange portion extending radially inward and a plurality of rollers, the edge- shaped bent portion is incorporated on the inner diameter side of the shell-shaped outer ring to prevent fluid leakage. A coreless seal for shell roller bearing assembly,
The coreless seal for cored shell roller bearings has an outer diameter and an inner diameter that have a tightening allowance in consideration of the amount of heat shrinkage as a whole dimension in the radial direction. If the dimension in the radial direction of the tightening allowance including the amount of heat shrinkage is A, and the outer diameter dimension of the coreless seal for incorporating the shell roller bearing in a free state at room temperature is B,
The coreless seal for assembling a shell roller bearing according to claim 1, wherein a relationship of 0.005B≤A≤0.030B is established. If the inner diameter of the shell-shaped outer ring is C,
The coreless seal for a shell roller bearing built-in according to claim 1 or 2, wherein a relationship of 0.950B≤C≤0.985B is established. When the inner diameter dimension of the coreless seal for incorporating the shell roller bearing in a free state at room temperature is D, and the outer diameter dimension of the rotating shaft supported by the shell roller bearing is E,
The coreless seal for assembling a shell roller bearing according to any one of claims 1 to 3, wherein a relationship of E <D <E + 2A is established.

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