JP2013119785A - Rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating machine capable of suppressing the grease filled in a bearing from being washed away.SOLUTION: A drain hole 4e communicated with a space 8 configured between the bearing 6 and a seal member 7 with respect to a case 4 is formed. Accordingly, even when liquid in a liquid storage chamber 4a leaks into the space 8 beyond the seal member 7, the liquid can be discharged from the drain hole 4e. Further, an atmosphere introducing hole 4f which is communicated with the space 8 is disposed. Thereby, the inside of the space 8 can be kept at an atmospheric pressure and, even when the drain hole 4e is blocked with liquid, the liquid can be reliably discharged through the drain hole 4e. Therefore, even when the liquid leaks beyond the seal member 7 to the bearing 6 side while it is suppressed that the liquid in the liquid storage chamber 4a leaks from a gap between the case 4 and a rotating shaft 3 by the seal member 7, it can be suppressed that the grease filled in the bearing 6 is washed away.

Description

  The present invention relates to a rotary machine provided with a seal member so as to surround the periphery of a rotary shaft.

  Conventionally, in Patent Document 1, as an example of a rotating machine having a seal member that prevents a liquid from flowing through a gap between a rotating shaft and a case surrounding the rotating shaft, and a bearing that supports the rotating shaft, There is a rotary pump device shown in Document 1. This rotary pump device is inserted into a metal housing that constitutes an actuator for brake fluid pressure control, and drives two rotary pumps accommodated in a case by a single rotating shaft. In this rotary pump device, the rotating shaft is supported by a bearing on the rear end side of the case. An oil seal that surrounds the rotating shaft is provided inside the case from the bearing so that brake fluid leakage from the rotary pump side can be suppressed through the gap between the case and the rotating shaft inside the case from the bearing. ing.

JP 2008-49743 A

  However, like the rotary pump device shown in Patent Document 1 described above, brake fluid leakage through the rotation shaft and the case can be suppressed by providing an oil seal, but it cannot be completely suppressed. For this reason, brake fluid leakage occurs on the bearing side beyond the oil seal, and this brake fluid further flows to the outside of the bearing, and the grease filled in the bearing is washed away. The problem arises that rotational movement is hindered. Therefore, it is necessary to prevent the grease of the bearing from being washed away even if brake fluid leaks beyond the oil seal.

  Here, as an example of the rotary machine, a rotary pump device is taken as an example. However, the rotary machine is provided with a liquid storage chamber in which liquid is stored inside the case, and the rotary shaft is inserted into the liquid storage chamber, and the liquid in the liquid storage chamber is inserted from the gap between the case and the rotary shaft. In the case of including a seal member that suppresses leakage, the above problem may occur.

  In view of the above, the present invention prevents the liquid in the liquid storage chamber from leaking from the gap between the case and the rotating shaft by the seal member, and even if the liquid leaks to the bearing side beyond the seal member, the bearing It aims at enabling it to control that the grease filled up in it is washed away.

  In order to achieve the above object, the invention according to claim 1 is formed at a position below the center of the rotating shaft (3) in the case (4) of the rotating machine, and the sealing member (7) in the housing portion (4c). ) And the bearing (6) are communicated with the outside of the case (4), and the liquid leaked from the liquid storage chamber (4a) beyond the seal member (7) A drain hole (4e) for discharging and an air introduction hole (4f) for introducing air at atmospheric pressure into the space (8) are formed.

  With such a configuration, even if the liquid in the liquid storage chamber (4a) leaks into the space (8) beyond the seal member (7), the liquid is discharged from the drain hole (4e). Is possible. Since the air introduction hole (4f) communicating with the space (8) is provided, the inside of the space (8) can be maintained at atmospheric pressure, and the drain hole (4e) is blocked by the liquid. The liquid can be reliably discharged through the drain hole (4e). Therefore, the seal member (7) prevents the liquid in the liquid storage chamber (4a) from leaking from the gap between the case (4) and the rotating shaft (3), and the bearing exceeds the seal member (7). Even if the liquid leaks to the (6) side, it is possible to prevent the grease filled in the bearing (6) from being washed away.

  Here, it is assumed that the end surface on the seal member (7) side of the outer race (6b) is opposite to the end on the bearing (6) side in the drain hole (4e) (on the rotating shaft (3) ) Between the end surface of the outer race (6b) and the end portion of the drain hole (4e), the inner wall of the housing portion (4c) is separated by the distance between them. Will intervene. At this time, when the liquid leaking from the liquid storage chamber (4a) to the space (8) adheres to the end surface of the bearing (6) and flows down along the end surface, the liquid flows into the storage portion (4c). It adheres to the lowest position among the curved surfaces parallel to the axial direction of the rotating shaft (3) on the inner wall, and this tends to accumulate due to surface tension.

  In that respect, as described in claim 2, the end of the outer race (6b) on the seal member (7) side coincides with the end of the drain hole (4e) on the bearing (6) side, or the drain The inner wall of the accommodating portion (4c) is prevented from interposing as much as possible between the end surface of the outer race (6b) and the end portion of the drain hole (4e) because it has entered the inside of the hole (4e). it can. Accordingly, the liquid leaking from the liquid storage chamber (4a) to the space (8) is likely to reach the drain hole (4e), and is easily discharged to the outside through the drain hole (4c).

  In the invention according to claim 3, the bearing (6) is chamfered at the tip position on the seal member (7) side of the outer race (6b), and the chamfered portion is inside the drain hole (4e). It is characterized by being located in.

  In this way, by setting the chamfered portion to be located inside the drain hole (4e), it is possible to eliminate the recess into which the liquid enters, so that the liquid flows more smoothly into the drain hole (4e). Can be.

  In the invention according to claim 4, the bearing (6) has a space between the seal member (7) and the bearing (6) between the inner race (6a) and the outer race (6b). It is characterized by including a seal plate (6d) that shields from the space (8) configured in the above.

  Thus, by providing the seal plate (6d) with the drain hole (4e) and the air introduction hole (4f), even if liquid leaks to the bearing (6) side beyond the seal member (7), the bearing (6) It is possible to further suppress washing of the grease filled in the inside.

  In the invention according to claim 5, the accommodating portion (4 c) is reduced in diameter at a portion where the seal member (7) is arranged, compared to a portion where the bearing (6) is arranged, and the reduced portion. The seal member (7) is fitted into the taper surface (4d) at the boundary position between the reduced diameter portion and the portion where the bearing (6) is disposed, and the tapered surface (4d) is the drain. It is characterized by overlapping with the hole (4e).

  By setting it as such a structure, the liquid which leaked over the sealing member (7) reaches the lowest position in the curved surface parallel to the axial direction of the rotating shaft (3) in the inner wall of the accommodating part (4c). It can be made to flow into the drain hole (4e) before. Therefore, the liquid can flow more smoothly into the drain hole (4e).

  The invention described in claim 6 is characterized in that the drain hole (4e) and the air introduction hole (4f) are formed by round holes having the same diameter.

  In this way, if the drain hole (4e) and the air introduction hole (4f) have the same diameter, they can be formed by the same drill when they are formed by drilling, and the manufacturing process is simplified. Can be planned.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows an example of a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a partial cross section enlarged view of the rotary machine concerning 1st Embodiment of this invention. It is the elements on larger scale of the part enclosed with the dashed-dotted line in FIG. It is sectional drawing which gave the example at the time of changing the positional relationship of a chamfering process part and the drain hole 4e.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an enlarged partial cross-sectional view of a rotating machine according to an embodiment of the present invention. FIG. 2 is a partially enlarged view of a portion surrounded by a one-dot chain line in FIG. The vertical direction and horizontal direction shown in FIG. 1 correspond to the vertical direction and horizontal direction when the rotating machine is assembled. Hereinafter, the details of the rotating machine according to the present embodiment will be described with reference to these drawings.

  A rotating machine 1 shown in FIG. 1 includes a rotating shaft 3 connected to a driving shaft (not shown) provided in a motor 2 and a case 4 in which a central hole 4b communicating with a liquid storage chamber 4a for storing a liquid is formed. And so on.

  The rotating machine 1 is fixed to the housing 5 in a state of being inserted into an insertion hole 5a formed in the metal housing 5 (hereinafter, the direction of insertion of the rotating machine 1 into the insertion hole 5a is simply referred to as the insertion direction). Called). Examples of the rotary machine 1 include a rotary pump device. When the rotary machine 1 is a rotary pump device, for example, it is provided in an actuator for brake hydraulic pressure control, and a room in which two rotary pumps are provided is defined as a liquid storage chamber 4a and supplied to a wheel cylinder through a brake pipe. Used to control brake fluid pressure.

  The rotating shaft 3 of the rotating machine 1 is supported by the bearing 6 on the rear end side that is the motor 2 side of the case 4, specifically, on the rear side of the liquid storage chamber 4 a in the case 4 in the insertion direction. The case 4 has a housing portion 4c whose inner diameter is larger than the diameter of the rotary shaft 3 at the rear in the insertion direction, and a bearing 6 is disposed in the housing portion 4c. That is, the bearing 6 is fitted in the housing portion 4 c formed outside the liquid housing chamber 4 a in the axial direction of the rotary shaft 3 in the case 4.

  Although any structure may be applied to the bearing 6, a narrow ball bearing is applied in the present embodiment. Specifically, the bearing 6 includes an inner race 6a, an outer race 6b, and a plurality of rolling elements 6c disposed between the inner race 6a and the outer race 6b. , Filled with grease (not shown). The outer race 6b is inserted into the housing 4c of the case 4 and fixed to the bearing 6, and the rotary shaft 3 is fitted in the hole of the inner race 6a so that the rotary shaft 3 is pivotally supported.

  The bearing 6 is also provided with a seal plate 6d. The seal plates 6d are arranged on both axial sides of the inner race 6a and the outer race 6b, and shield the space between the inner race 6a and the outer race 6b and the space 8 and the outside of the bearing 6. doing. Since the bearing 6 is disposed rearward in the insertion direction, the seal plate 6d is provided, so that when the liquid in the liquid storage chamber 4a leaks, it can be further prevented from leaking outside through the bearing 6. Become.

  Further, an annular seal member 7 that surrounds the rotary shaft 3 is disposed on the distal end side of the case 4 in the insertion direction from the bearing 6, that is, on the liquid storage chamber 4 a side. The seal member 7 is also disposed in the housing portion 4c of the case 4, and the seal member 7 and the bearing 6 are sequentially fitted into the housing portion 4c.

  The seal member 7 includes a metal plate 7a, an elastic member 7b, and a coil spring 7c. The metal plate 7a is formed in a ring shape and is integrated with the elastic member 7b by integral molding or the like. The elastic member 7 b is made of a ring member having a V-shaped cross section extending toward the bearing 6, and is in contact with at least the inner wall surface of the case 4 and the outer peripheral surface of the rotating shaft 3. The coil spring 7 c generates an elastic force that presses the elastic member 7 b against the rotating shaft 3. The gap between the case 4 and the rotary shaft 3 is sealed by the sealing member 7 configured as described above, and basically the liquid in the liquid storage chamber 4a passes through the gap between the case 4 and the rotary shaft 3. The flow to the bearing 6 side is suppressed.

  In addition, the accommodating part 4c of the case 4 has a diameter smaller than the part where the bearing 6 is disposed at the part where the seal member 7 is disposed, and the seal member 7 is fitted into the part where the diameter is reduced. The boundary position between the reduced diameter portion and the portion where the bearing 6 is arranged is a tapered surface 4d, and the seal member 7 can be easily inserted by the inclination of the tapered surface 4d.

  As described above, since the seal member 7 is provided between the bearing 6 and the liquid storage chamber 4 a, the liquid in the liquid storage chamber 4 a is placed in the space 8 configured between the seal member 7 and the bearing 6. Leakage is suppressed. However, since the liquid leakage cannot be completely prevented by the sealing function of the seal member 7, the liquid in the liquid storage chamber 4 a may leak into the space 8. In order to discharge the leaked liquid to the outside of the rotary machine 1, a drain hole 4 e communicating with the space 8 and an air introduction hole 4 f are formed in the case 4.

  The drain hole 4 e is formed at a position below the center of the rotating shaft 3 in the case 4. The drain hole 4e is formed, for example, as a round hole, and is formed along the radial direction of the rotary shaft 3 by drilling or the like. The drain hole 4e basically only needs to be formed on the bearing 6 side of the seal member 7 with respect to the inner wall surface of the case 4 while communicating with the space 8. However, in the present embodiment, as shown in FIG. 2, the tip of the bearing 6 on the seal member 7 side is the front side in the insertion direction from the end of the drain hole 4e on the bearing 6 side (point P in FIG. 2), That is, the drain hole 4e is formed so as to protrude inside the drain hole 4e and overlap the tapered surface 4d.

  The air introduction hole 4 f communicates with the space 8 and plays a role of bringing the space 8 to atmospheric pressure by introducing air into the space 8. The air introduction hole 4f may be formed at any position in the case 4 as long as it is difficult to be blocked by air leaking through the seal member 7, that is, a position where the air can be introduced. However, in this embodiment, it is formed above the case 4. The air introduction hole 4f is also formed, for example, as a round hole, and is formed along the radial direction of the rotary shaft 3 by drilling or the like.

  The dimensions of the drain hole 4e and the air introduction hole 4f are arbitrary. For example, if they are made to have the same diameter, they can be formed by the same drill when they are formed by drilling. Can be simplified. For example, when these are formed at positions facing each other with the rotation shaft 3 therebetween (positions shifted by 180 ° about the rotation shaft 3), both holes 4e and 4f can be formed by a single drilling process. it can. Alternatively, the case 4 may be formed in order by rotating the case 4 around the central axis of the rotation shaft 3 without forming the rotation shaft 3 at opposite positions. However, these do not necessarily have the same size, and at least the drain hole 4e may have a size that does not block the drain hole 4e by a liquid film, for example, an oil film of brake fluid. Any size that can be introduced is acceptable.

  As described above, in the rotary machine 1 according to the present embodiment, the drain hole 4e communicating with the space 8 formed between the bearing 6 and the seal member 7 in the case 4 is formed. For this reason, even if the liquid in the liquid storage chamber 4a leaks into the space 8 beyond the seal member 7, the liquid can be discharged from the drain hole 4e. Since the atmosphere introduction hole 4f communicating with the space 8 is provided, the inside of the space 8 can be maintained at an atmospheric pressure, and even if the drain hole 4e is blocked by the liquid, the liquid is surely passed through the drain hole 4e. Can be discharged.

  In addition, the provision of the air introduction hole 4 f contributes to downsizing of the rotary machine 1. That is, if the air introduction hole 4f is not provided, the drain hole 4e must have a certain inner diameter so that the drain hole 4e is not blocked by the oil film of the brake fluid. In addition, by providing the air introduction hole 4f, an oil film is hardly formed even if the inner diameter of the drain hole 4e is set smaller than that described above. Accordingly, it is possible to expect a reduction in the size of the rotary machine 1 due to the reduction in the inner diameter of the drain hole 4e.

  Therefore, the liquid in the liquid storage chamber 4a is prevented from leaking from the gap between the case 4 and the rotating shaft 3 by the seal member 7, and even if the liquid leaks to the bearing 6 side beyond the seal member 7, the bearing It can suppress that the grease filled in 6 is washed away. Further, the liquid that has passed through the bearing 6 and the grease washed away by the liquid can be prevented from entering the motor 2.

  Moreover, in the rotary machine 1 of this embodiment, it is set as the structure provided with the seal plate 6d in the bearing 6. FIG. When the seal plate 6d is provided, the liquid can be further prevented from entering the bearing 6 and the grease in the bearing 6 can be further prevented from being washed away, but even if the seal plate 6d is provided, it is completely suppressed. It's not possible. In particular, if the drain hole 4e and the air introduction hole 4f are not provided, there is no escape space for the liquid that has flowed into the space 8 beyond the seal member 7, so that the liquid enters the bearing 6 beyond the seal plate 6d. Sometimes. For this reason, by providing the seal plate 6d with the drain hole 4e and the air introduction hole 4f, even if liquid leaks to the bearing 6 side beyond the seal member 7, the grease filled in the bearing 6 is washed away. This can be further suppressed.

  Further, as shown in FIG. 2, the tip of the outer race 6b of the bearing 6 on the seal member 7 side protrudes inside the drain hole 4e. If the end surface on the seal member 7 side of the outer race 6b is disposed on the side opposite to the seal member 7 (outside in the axial direction of the rotary shaft 3) than the end on the bearing 6 side in the drain hole 4e, the outer race Between the end surface of 6b and the end portion of the drain hole 4e, the inner wall of the accommodating portion 4c is interposed as much as the two are separated from each other. At this time, when the liquid leaking from the liquid storage chamber 4a to the space 8 adheres to the end surface of the bearing 6 and flows down along the end surface, the liquid is rotated by the axis of the rotary shaft 3 on the inner wall of the storage portion 4c. It adheres to the lowest position among the curved surfaces parallel to the direction, and this tends to accumulate due to surface tension. For this reason, by setting it as a structure like this embodiment, it can avoid interposing the said inner wall of the accommodating part 4c as much as possible between the said end surface of the outer race 6b, and the said edge part of the drain hole 4e. Therefore, the liquid leaking from the liquid storage chamber 4a to the space 8 is likely to reach the drain hole 4e and is easily discharged to the outside through the drain hole 4c.

  As for the above effect, the tip of the bearing 6 on the seal member 7 side coincides with the end of the drain hole 4e on the bearing 6 side (point P in FIG. 2) or the inside of the drain hole 4e. You can get it if you are located in However, the outer edge of the outer race 4b in the bearing 6 may be chamfered at the tip position. In this case, for example, as shown in FIG. 3A, it is preferable that the chamfered portion is positioned inside the drain hole 4e. That is, as shown in FIG. 3B, when the tip of the bearing 6 on the seal member 7 side coincides with the end of the drain hole 4e on the bearing 6 side, the chamfered portion and the inner wall of the housing portion 4c There is a possibility that a recess is formed between the liquids, and the liquid enters the recess to obstruct the flow of the liquid. For this reason, by setting the chamfered portion to be located inside the drain hole 4e, a recess into which the liquid enters can be eliminated, and the liquid can flow more smoothly into the drain hole 4e.

  In the present embodiment, the drain hole 4e is formed so as to overlap the tapered surface 4d. For this reason, the liquid leaking beyond the seal member 7 can flow into the drain hole 4e before reaching the lowest position of the curved surface parallel to the axial direction of the rotating shaft 3 on the inner wall of the accommodating portion 4c. Therefore, the liquid can flow more smoothly into the drain hole 4e.

  The discharged liquid is stored in a liquid reservoir (not shown) through a liquid flow path existing outside the case 4. The liquid flow path can be configured, for example, by forming a gap between the housing 5 and the case 4 or between the housing 5 and the motor 2. Also good.

(Other embodiments)
In the above-described embodiment, an example of the rotating machine 1 has been described. However, the components of the rotating machine 1 can be changed as appropriate. For example, the seal member 7 has a structure including the metal plate 7 a, the elastic member 7 b, and the coil spring 7 c, but may be an annular seal member that can seal between the rotating shaft 3 and the case 4. Moreover, although the rotary pump apparatus was mentioned as an example as the rotary machine 1, it supports the annular seal member and rotary shaft which suppress a fluid flow through the clearance gap between the rotary shaft and the case surrounding the rotary shaft. It may be another rotating machine having a bearing.

  DESCRIPTION OF SYMBOLS 1 ... Rotary machine, 2 ... Motor, 3 ... Rotating shaft, 4 ... Case, 4a ... Liquid storage chamber, 4b ... Center hole, 4c ... Storage part, 4d ... Tapered surface, 4e ... Drain hole, 4f ... Air introduction hole, DESCRIPTION OF SYMBOLS 5 ... Housing, 5a ... Insertion hole, 6 ... Bearing, 6a ... Inner race, 6b ... Outer race, 6c ... Rolling element, 6d ... Seal plate, 7 ... Seal member, 7a ... Metal plate, 7b ... Elastic member 7b, 7c ... coil spring, 8 ... space.

Claims (6)

A rotating shaft (3);
The rotary shaft (3) is surrounded by a liquid storage chamber (4a) in which a liquid is stored, and is disposed outside the liquid storage chamber (4a) in the axial direction of the rotary shaft (3). A case (4) in which a housing part (4c) is formed;
A plurality of rolling elements (6c) disposed between the inner race (6a) and the outer race (6b) and the inner race (6a) and the outer race (6b) are disposed in the housing portion (4c) of the case (4). ) And filled with grease, and a bearing (6) for supporting the rotating shaft,
It arrange | positions between the said liquid storage chamber (4a) and the said bearing (6) while being arrange | positioned at the said accommodating part (4c), and through the clearance gap between the said rotating shaft (3) and the said case (4). A rotary machine having an annular seal member (7) for suppressing liquid flow;
A space formed at a position below the center of the rotation shaft (3) in the case (4) and configured between the seal member (7) and the bearing (6) in the housing portion (4c). (8) and the outside of the case (4) communicate with each other, a drain hole (4e) for discharging the liquid leaking from the liquid storage chamber (4a) over the seal member (7), and the space ( 8) A rotary machine characterized in that an atmospheric introduction hole (4f) for introducing air at atmospheric pressure into the atmospheric pressure is formed.   The tip of the outer race (6b) of the bearing (6) on the seal member (7) side coincides with the end of the drain hole (4e) on the bearing (6) side, or the drain hole (4e). The rotating machine according to claim 1, wherein the rotating machine is located inward of the rotating machine.   The bearing (6) is chamfered at the tip of the outer race (6b) on the seal member (7) side, and the chamfered portion is located inside the drain hole (4e). The rotating machine according to claim 1, wherein the rotating machine is a rotating machine.   In the bearing (6), a space between the inner race (6a) and the outer race (6b) is formed between the seal member (7) and the bearing (6). The rotary machine according to any one of claims 1 to 3, further comprising a seal plate (6d) for shielding from the space (8). The accommodating part (4c) is enlarged in the case (4) from the diameter of the rotating shaft (3) outside the liquid accommodating part (4a) in the axial direction of the rotating shaft (3). Configured, and the seal member (7) and the bearing (6) are sequentially fitted in the accommodating portion (4c),
The accommodating portion (4c) has a smaller diameter at a portion where the seal member (7) is disposed than a portion where the bearing (6) is disposed, and the seal member (7 ) And a boundary position between the reduced diameter portion and the portion where the bearing (6) is disposed is a tapered surface (4d), and the tapered surface (4d) is formed in the drain hole (4e). The rotating machine according to any one of claims 1 to 4, wherein   The rotary machine according to any one of claims 1 to 5, wherein the drain hole (4e) and the air introduction hole (4f) are configured by round holes of the same size.

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