JP2008089041A - Sealing structure of rotating shaft member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress heat generation of a sliding part of a sealing member and a rotating shaft member. <P>SOLUTION: The sealing structure 10 of the rotating shaft member is equipped with the rotating shaft member 12 and the sealing member 14 having a lip part 24. In the rotating shaft member 12, a cooling liquid introduction hole 16 is formed along the rotation axis direction. Thus, when the cooling liquid is supplied from a cooling liquid supply part 50 with the cooling liquid supply part 50 communicated with a cooling liquid introduction port 18 of the cooling liquid introduction hole 16, this cooling liquid can be introduced to the cooling liquid introduction hole 16 via the cooling liquid introduction port 18 and the cooling liquid can be introduced to a position overlappnig with the lip part 24 in the cooling liquid introduction hole 16 in the rotation axis direction. Hence, it is possible to cool the sliding part between the outer circumference part of the rotation shaft member 12 and the lip part 24 by the cooling liquid introduced to this cooling liquid introduction hole 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seal structure for a rotary shaft member, and more particularly to a seal structure for a rotary shaft member provided with a seal member that is slidably contacted with an outer periphery of the rotary shaft member in a liquid-tight state.

Conventionally, the following is known as a seal structure of this kind of rotating shaft member (for example, refer to patent documents 1). For example, Patent Document 1 discloses an example in which an output shaft of a motor provided in a water pump is sealed with an oil seal.
JP 2003-222099 A JP-A-9-88898 Japanese Patent Laid-Open No. 5-149294

  However, in the rotary shaft member seal structure provided with this type of seal member, the sliding contact portion of the seal member with the rotary shaft member generates heat as the rotary shaft member rotates.

  The present invention has been made in view of the above problems, and the object thereof is to suppress the heat generation of the sliding contact portion of the seal member with the rotating shaft member even when the rotating shaft member is rotating. Another object of the present invention is to provide a seal structure for a rotary shaft member.

  In order to solve the above-described problem, a seal structure for a rotary shaft member according to claim 1 is disposed at a rotary shaft member that is rotated by receiving a rotational force from the outside, and an intermediate portion in the rotary shaft direction of the rotary shaft member. A seal member configured to have a lip portion that is slidably contacted with an outer peripheral portion of the rotating shaft member in a liquid-tight state, and the rotating shaft member is formed along the rotating shaft direction, One end side is opened as a coolant introduction port communicated with a coolant supply means capable of supplying a coolant, and the other end side is positioned on the opposite side of the lip portion from the coolant introduction port in the rotation axis direction. It is characterized in that a configured coolant introduction hole is provided.

  According to the seal structure of the rotating shaft member according to claim 1, the rotating shaft member is rotated by receiving a rotational force from the outside. At this time, a seal member is disposed at the rotation shaft direction intermediate portion of the rotation shaft member, and this seal member has a lip portion that is slidably contacted with the outer peripheral portion of the rotation shaft member in a liquid-tight state. The space between the rotary shaft members is sealed.

  Here, a coolant introduction hole is formed in the rotating shaft member described above along the rotating shaft direction. One end side of the coolant introduction hole is opened as a coolant introduction port communicating with a coolant supply means capable of supplying the coolant, and the other end side is opposite to the coolant introduction port and the rotation axis direction from the lip portion. It is configured to be located on the side.

  Accordingly, when the coolant is supplied from the coolant supply means in a state where the coolant supply means and the coolant introduction port of the coolant introduction hole are in communication, the coolant is supplied via the coolant introduction port. The coolant can be introduced into the coolant introduction hole, and the coolant can be guided to a position overlapping the lip portion in the coolant introduction hole in the rotation axis direction. Thereby, the sliding contact part of the outer peripheral part of a rotating shaft member and a lip | rip part can be cooled with the cooling fluid introduced into this cooling fluid introduction hole. As a result, even when the rotating shaft member is rotating, it is possible to suppress heat generation at the lip portion that is a sliding contact portion of the seal member with the rotating shaft member.

  The seal structure of the rotating shaft member according to claim 2 is the seal structure of the rotating shaft member according to claim 1, wherein the coolant introduction hole has the other end side more than the lip portion of the rotating shaft member. The bag is configured to terminate in a position opposite to the coolant introduction port and the direction of the rotation axis.

  According to the seal structure of the rotating shaft member according to claim 2, the cooling liquid introduction hole has the other end side terminated at a position opposite to the cooling liquid introducing port and the rotating shaft direction from the lip portion of the rotating shaft member. Configured. Therefore, even when the coolant is introduced from the coolant supply means into the coolant introduction hole, it is possible to prevent the coolant from flowing out from the other end side of the coolant introduction hole. Thereby, the sealing performance in the other end side of a rotating shaft member is securable. That is, it is possible to prevent the coolant from flowing out to the other end side of the rotating shaft member rather than the seal member.

  The seal structure for the rotary shaft member according to claim 3 is the seal structure for the rotary shaft member according to claim 1 or 2, wherein the coolant introduction hole is filled with coolant from the coolant supply means. Cooling liquid supply inducing means for inducing supply is provided.

  According to the seal structure of the rotating shaft member according to the third aspect, the coolant supply inducing means for inducing the supply of the coolant from the coolant supply means is provided in the coolant introduction hole. Therefore, the supply of the coolant from the coolant supply means to the coolant introduction hole can be induced by the coolant supply induction means. Thereby, since the amount of fresh coolant introduced into the coolant introduction hole can be increased, the cooling effect of the sliding contact portion between the outer peripheral portion of the rotary shaft member and the lip portion can be enhanced.

  The seal structure of the rotating shaft member according to claim 4 is the seal structure of the rotating shaft member according to claim 3, wherein the cooling liquid supply inducing means is arranged around the rotating shaft on the inner peripheral surface of the cooling liquid introducing hole. It is a formed spiral groove.

  According to the seal structure of the rotating shaft member according to the fourth aspect, the above-described cooling liquid supply inducing means is constituted by a spiral groove formed around the rotating shaft on the inner peripheral surface of the cooling liquid introducing hole. Therefore, when the rotating shaft member rotates, the spiral groove also rotates integrally, and this spiral groove can induce the supply of the coolant to the coolant introduction hole. The amount of fresh coolant introduced can be increased.

  Further, according to the seal structure of the rotating shaft member according to claim 4, no special equipment such as a liquid feeding device is required to induce the supply of the coolant to the coolant introduction hole, and the coolant introduction hole Since this is a simple configuration in which a spiral groove is provided on the inner circumferential surface, the configuration of the entire seal structure can be simplified.

[First embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIG.

  FIG. 1 is a sectional view showing a seal structure 10 for a rotary shaft member according to a first embodiment of the present invention. As shown in this figure, the rotary shaft member sealing structure 10 includes a rotary shaft member 12 and a seal member 14.

  The rotating shaft member 12 is suitably used as an output shaft of a motor, for example. A coolant introduction hole 16 is formed in the rotation shaft member 12 along the rotation axis direction.

  The coolant introduction hole 16 is opened as a coolant introduction port 18 whose one end side is communicated with a coolant supply section (coolant supply means) 50 capable of supplying the coolant, and the other end side 19. Is formed in a bag shape that terminates at a position opposite to the coolant introduction port 18 and the rotation axis direction (arrow B side) from a lip portion 24 described later of the rotation shaft member 12.

  The entire seal member 14 is made of, for example, a resin such as rubber. The seal member 14 includes an annular main body portion 22 and is disposed at an intermediate portion in the rotation axis direction of the rotation shaft member 12. A pair of upper and lower lip portions 24 extending radially inward are formed in an annular shape along the circumferential direction on the inner circumferential portion of the main body portion 22. The tip of the lip portion 24 is in liquid-tight contact with the outer peripheral portion of the rotary shaft direction intermediate portion of the rotary shaft member 12.

  Next, the operation of the first embodiment of the present invention will be described.

  According to the seal structure 10 of the rotary shaft member according to the first embodiment of the present invention, the rotary shaft member 12 is configured, for example, as an output shaft of a motor, and is rotated in the direction of the arrow R in response to a rotational force from the outside. The At this time, the seal member 14 is disposed at the intermediate portion in the rotation axis direction of the rotation shaft member 12, and the seal member 14 is slidably contacted with the outer peripheral portion of the rotation shaft member 12 in a liquid-tight state. 24, and seals between the rotary shaft member 12.

  Here, the above-described rotating shaft member 12 is formed with a coolant introduction hole 16 along the rotating shaft direction. The coolant introduction hole 16 has a coolant introduction port 18 at one end thereof communicated with the coolant supply unit 50, and the other end side 19 is connected to the coolant introduction port 18 and the rotation axis direction from the lip portion 24 of the rotary shaft member 12. Is located on the opposite side (arrow B side).

  Therefore, when the coolant W is supplied from the coolant supply unit 50 in a state where the coolant supply unit 50 and the coolant introduction port 18 of the coolant introduction hole 16 are communicated with each other, the coolant W is cooled. The coolant can be introduced into the coolant introduction hole 16 through the liquid introduction port 18, and the coolant W can be guided to a position overlapping the lip portion 24 in the coolant introduction hole 16 in the rotation axis direction.

  Accordingly, the sliding contact portion between the outer peripheral portion of the rotating shaft member 12 and the lip portion 24 can be cooled by the cooling liquid W introduced into the cooling liquid introduction hole 16. As a result, even when the rotary shaft member 12 is rotating, it is possible to suppress heat generation of the lip portion 24 that is a sliding contact portion of the seal member 14 with the rotary shaft member 12. Thereby, for example, it is possible to suppress the material deterioration and the like accompanying the temperature rise of the lip portion 24, and as a result, it is possible to ensure the sealing performance of the seal member 14 and improve the life.

  Moreover, according to the seal structure 10 of the rotating shaft member according to the first embodiment of the present invention, the coolant introduction hole 16 has a coolant introduction port 18 on the other end side 19 than the lip portion 24 of the rotation shaft member 12. It is configured in a bag shape that terminates at a position on the opposite side (arrow B side) in the rotation axis direction. Therefore, even when the coolant W is introduced from the coolant supply unit 50 into the coolant introduction hole 16, the coolant W can be prevented from flowing out from the other end side 19 of the coolant introduction hole 16. Thereby, the sealing property in the other end side of the rotating shaft member 12 is securable. That is, it is possible to prevent the coolant W from flowing out to the other end side of the rotary shaft member 12 relative to the seal member 14.

[Second Embodiment]
Next, a second embodiment of the present invention will be described based on FIG.

  FIG. 2 is a sectional view showing a seal structure 40 of a rotating shaft member according to the second embodiment of the present invention. As shown in this figure, in the rotary shaft member seal structure 40 according to the second embodiment of the present invention, the coolant provided on the rotary shaft member 12 is different from the configuration of the first embodiment of the present invention described above. The introduction hole 16 is modified as follows.

  That is, the cooling liquid introduction hole 16 has a spiral groove (cooling liquid supply inducing means) 26 formed around the rotation axis on the inner peripheral surface thereof. The spiral groove 26 is formed in a spiral shape so as to go from the other end side (terminal side) 19 to the coolant introduction port 18 as the rotary shaft member 12 rotates (in the direction of arrow R).

  Next, the operation of the second embodiment of the present invention will be described.

  According to the seal structure 40 of the rotating shaft member according to the second embodiment of the present invention, the cooling liquid introducing hole 16 has the spiral groove 26 formed around the rotating shaft on the inner peripheral surface thereof. The spiral groove 26 is formed in a spiral shape so as to go from the other end side (terminal side) 19 to the coolant introduction port 18 as the rotary shaft member 12 rotates (in the direction of arrow R). Therefore, when the rotary shaft member 12 rotates, the coolant stored in the coolant introduction hole 16 can be discharged to the coolant introduction port 18 side by the spiral groove 26 (arrow W1). As a result, the inside of the coolant introduction hole 16 is in a negative pressure state, and a new coolant can flow into the coolant introduction hole 16 from the coolant supply part 50 (arrow W2).

  At this time, the coolant accumulated in the coolant introduction hole 16 is discharged along the inner peripheral surface of the coolant introduction hole 16 in which the spiral groove 26 is formed (outer periphery side than the center of the hole) ( Arrow W1), a new coolant from the coolant supply unit 50 flows in from the center side of the coolant introduction hole 16 (arrow W2).

  Thus, according to the seal structure 40 of the rotating shaft member according to the second embodiment of the present invention, the supply of the coolant W from the coolant supply unit 50 to the coolant introduction hole 16 can be induced. Thereby, since the amount of fresh coolant introduced into the coolant introduction hole 16 can be increased, the cooling effect of the sliding contact portion between the outer peripheral portion of the rotating shaft member 12 and the lip portion 24 can be enhanced.

  Further, according to the seal structure 40 of the rotating shaft member according to the second embodiment of the present invention, special equipment such as a liquid feeding device is required to induce the supply of the cooling liquid W to the cooling liquid introduction hole 16. First, since the spiral groove 26 is provided on the inner peripheral surface of the coolant introduction hole 16, the configuration of the entire seal structure can be simplified.

[Example of application to water pump]
Next, an example in which the seal structure of the rotating shaft member of the present invention is applied to the water pump 60 will be described with reference to FIGS.

  FIG. 3 is a sectional view showing the overall configuration of the water pump 60 to which the seal structure of the rotary shaft member of the present invention is applied. FIG. 4 is an enlarged sectional view of the main part of the water pump 60 of FIG. The figure is shown. In this example, the rotary shaft member seal structure 40 according to the second embodiment of the present invention is applied to the water pump 60.

  The water pump 60 shown in this figure is used in an automobile engine cooling system. The water pump 60 includes a motor unit 62 and a pump unit 64.

  The motor unit 62 includes a motor housing 66 bent in a substantially L shape in a side view. The motor housing 66 includes a motor chamber 68 having a substantially cylindrical shape with a bottom, and a flow path 70 formed adjacent to the motor chamber 68 and having a substantially L shape.

  A motor 72 serving as a drive source is accommodated in the motor chamber 68. Further, an insertion hole 76 through which the rotary shaft member 12 provided as an output shaft of the motor 72 is inserted is formed in the shaft center portion of the bottom wall portion 66 </ b> A of the motor housing 66 constituting the motor chamber 68. Furthermore, an end plate 78 for holding the motor 72 in a fixed manner is attached to the open end of the motor chamber 68.

  A cylindrical seal holding portion 86 is integrally formed on the bottom wall portion 66 </ b> A of the motor housing 66. The main body portion 22 of the above-described seal member 14 is fitted to the seal holding portion 86. The outer peripheral portion of the main body portion 22 of the seal member 14 is in pressure contact with the inner peripheral surface of the seal holding portion 86. Further, the seal member 14 is located at the intermediate portion in the rotational axis direction of the rotary shaft member 12, and the lip portion 24 of the seal member 14 is in liquid-tight contact with the outer peripheral portion of the rotary shaft direction intermediate portion of the rotary shaft member 12. Has been.

  The pump portion 64 includes a pump housing 90 that can be fitted to an open end portion 66B (end portion on the distal end side of the rotating shaft member 12) on the bottom wall portion 66A side of the motor housing 66. The pump housing 90 has a generally cylindrical shape. The pump housing 90 includes a small-diameter cylindrical inflow portion 90A into which engine coolant (LLC) flows, a large-diameter main body portion 90B that is expanded from the inflow portion 90A to form a flat bottomed cylindrical shape, The cylindrical assembly 90C is further expanded from the main body 90B and fitted into the open end 66B of the motor housing 66.

  In the water pump 60, when the assembly portion 90C of the pump housing 90 is assembled to the open end portion 66B of the motor housing 66, the O fitted to the outer peripheral surface of the open end portion 66B of the motor housing 66. A ring 92 seals between the outer peripheral surface of the open end portion 66 </ b> B and the inner peripheral surface of the assembly portion 90 </ b> C of the pump housing 90.

  In addition, a partition wall 94 that is connected to the peripheral wall portion 66 </ b> C of the motor housing 66 that forms the motor chamber 68 is formed on the bottom wall portion of the main body portion 90 </ b> B of the pump housing 90. The internal space of the main body portion 90B is connected to the pump chamber 96 communicated with the internal space of the inflow portion 90A by the partition wall 94, and the connection path 98 communicating the pump chamber 96 with the inlet side of the flow path 70 described above. It is divided into and.

  And in this pump chamber 96, the impeller 100 is accommodated rotatably. The impeller 100 includes a plurality of wing parts 100A arranged radially. An insertion hole 102 is formed in the shaft center portion of the impeller 100 so as to penetrate in the rotation axis direction, and the rotation shaft member 12 of the motor 72 is press-fitted into the insertion hole 102. Therefore, when the motor 72 is actuated to rotate the rotary shaft member 12 around its axis, the impeller 100 is also coaxially and integrally rotated.

  The above is the main part of the water pump 60 according to the present embodiment. Supplementing the peripheral configuration, the inflow part 90A of the pump housing 90 and the outlet side of the flow path 70 circulate engine coolant (LLC). Connected with a circulation path for.

  Next, the operation of this application example will be described.

  When the motor 72 of the water pump 60 is actuated, the rotary shaft member 12 rotates about its axis (in the direction of arrow R), and the impeller 100 also rotates integrally in the same direction. As a result, the engine coolant W flows from the inflow portion 90 </ b> A and is discharged from the outlet side of the flow path 70 through the pump chamber 96 and the connection path 98. As a result, the engine coolant W circulates in the circulation path of the engine cooling system to cool the engine.

  Further, at this time, a seal member 14 is disposed at the intermediate portion of the rotary shaft member 12 in the rotary shaft direction, and the seal member 14 is slidably contacted with the outer peripheral portion of the rotary shaft member 12 in a liquid-tight state. The lip portion 24 is configured to seal between the rotary shaft member 12. Therefore, the sealing property between the motor chamber 68 and the pump chamber 96 is ensured.

  Here, the above-described rotating shaft member 12 is formed with a coolant introduction hole 16 along the rotating shaft direction. The coolant introduction hole 16 communicates with a pump chamber 96 in which the coolant introduction port 18 on one end side functions as a coolant supply means. Further, the coolant introduction hole 16 is configured such that the other end side 19 is positioned on the opposite side (arrow B side) to the coolant introduction port 18 and the rotation axis direction with respect to the lip portion 24 of the rotation shaft member 12.

  Therefore, as described above, when the impeller 100 rotates together with the rotating shaft member 12 and the engine coolant W flows from the inflow portion 90A, the engine coolant W flows through the coolant inlet 18 through the coolant inlet 18. In addition, the engine coolant W is introduced to a position where it overlaps with the lip portion 24 in the coolant introduction hole 16 in the rotation axis direction.

  Accordingly, the sliding contact portion between the outer peripheral portion of the rotating shaft member 12 and the lip portion 24 can be cooled by the engine coolant W introduced into the coolant introduction hole 16. As a result, even when the rotary shaft member 12 is rotating, it is possible to suppress heat generation of the lip portion 24 that is a sliding contact portion of the seal member 14 with the rotary shaft member 12. Thereby, for example, it is possible to suppress material deterioration and the like accompanying the temperature rise of the lip portion 24, and as a result, it is possible to ensure the sealing performance of the sealing member 14 and further the sealing performance of the motor chamber 68 and the pump chamber 96. . In addition, it is possible to improve the life of the seal member 14 and thus the life of the water pump 60.

  Further, the coolant introduction hole 16 is configured in a bag shape in which the other end side 19 terminates at a position opposite to the coolant introduction port 18 and the rotation axis direction (arrow B side) with respect to the lip portion 24 of the rotation shaft member 12. Has been. Therefore, even when the engine coolant W is introduced from the pump chamber 96 into the coolant introduction hole 16, the engine coolant W flows into the motor chamber 68 from the other end side 19 of the coolant introduction hole 16 through the insertion hole 76. Can be prevented. Thereby, the sealing performance at the other end side of the rotating shaft member 12 and the sealing performance of the motor chamber 68 can be secured.

  In addition, a spiral groove 26 is formed around the rotation axis of the coolant introduction hole 16 on the inner peripheral surface thereof. The spiral groove 26 is formed in a spiral shape so as to go from the other end side (terminal side) 19 to the coolant introduction port 18 as the rotary shaft member 12 rotates (in the direction of arrow R). Accordingly, when the rotary shaft member 12 rotates, the coolant stored in the coolant introduction hole 16 is moved to the coolant introduction port 18 side by the spiral groove 26 and discharged from the coolant introduction port 18 to the pump chamber 96. Yes (arrow W1). As a result, the inside of the coolant introduction hole 16 is in a negative pressure state, and a new coolant can flow from the pump chamber 96 into the coolant introduction hole 16 (arrow W2).

  Thus, according to this example, supply of the coolant W from the pump chamber 96 to the coolant introduction hole 16 can be induced. Thereby, since the amount of fresh coolant introduced into the coolant introduction hole 16 can be increased, the cooling effect of the sliding contact portion between the outer peripheral portion of the rotating shaft member 12 and the lip portion 24 can be enhanced.

  Further, no special equipment such as a liquid feeding device is required to induce the supply of the engine coolant W to the coolant introduction hole 16, and the spiral groove 26 is simply provided on the inner peripheral surface of the coolant introduction hole 16. Therefore, the configuration of the entire seal structure, and thus the configuration of the water pump 60 can be simplified.

  Next, a modification of the embodiment of the present invention will be described.

  In this application example, the application example of the seal structure of the rotating shaft member of the present invention to the water pump 60 has been described. However, the seal structure of the rotating shaft member of the present invention can be applied to other than the water pump 60. It is.

It is sectional drawing of the sealing structure of the rotating shaft member which concerns on 1st embodiment of this invention. It is sectional drawing of the sealing structure of the rotating shaft member which concerns on 2nd embodiment of this invention. It is sectional drawing which shows the whole structure of the water pump to which the sealing structure of the rotating shaft member of this invention was applied. It is a principal part expanded sectional view of the water pump of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10,40 ... Seal structure, 12 ... Rotating shaft member, 14 ... Seal member, 16 ... Coolant introduction hole, 18 ... Coolant introduction port, 20 ... Coolant discharge port, 22 ... Main part, 24 ... Lip part, 26 DESCRIPTION OF SYMBOLS ... Spiral groove | channel (coolant supply supply means), 50 ... Coolant supply part (coolant supply means), 60 ... Water pump, 62 ... Motor part, 64 ... Pump part, 66 ... Motor housing, 68 ... Motor chamber, 70 ... Flow path, 72 ... Motor, 76 ... Insertion hole, 78 ... End plate, 86 ... Seal holder, 90 ... Pump housing, 92 ... O-ring, 94 ... Septum, 96 ... Pump chamber (coolant supply means), 98 ... connection path, 100 ... impeller, 102 ... insertion hole

Claims (4)

A rotating shaft member that is rotated by receiving a rotational force from the outside;
A seal member that is disposed at a rotation axis direction intermediate portion of the rotation shaft member and includes a lip portion that is slidably contacted with an outer peripheral portion of the rotation shaft member in a liquid-tight state;
With
The rotation shaft member is formed along the rotation axis direction, and one end side is opened as a coolant introduction port communicating with a coolant supply means capable of supplying the coolant, and the other end side is more than the lip portion. A seal structure for a rotary shaft member, characterized in that a coolant introduction hole configured to be located on the opposite side of the coolant introduction port from the rotation axis direction is provided.   The coolant introduction hole is configured in a bag shape in which the other end side terminates at a position opposite to the coolant introduction port and the rotation axis direction from the lip portion of the rotation shaft member. The seal structure of the rotating shaft member according to claim 1.   The rotation according to claim 1 or 2, wherein the coolant introduction hole is provided with a coolant supply inducing means for inducing the supply of the coolant from the coolant supply means. Seal structure of shaft member.   4. The seal structure for a rotary shaft member according to claim 3, wherein the coolant supply inducing means is a spiral groove formed around an axis of rotation on the inner peripheral surface of the coolant introduction hole.

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