JP2007187221A - Seal structure of rotary part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reliable seal structure advantageous in terms of cost. <P>SOLUTION: This seal structure of a rotary part is formed by arranging a seal member 300 between a rotary member 100 and a fixed member 200. The contact area between the rotary member 100 and the seal member 300 is formed smaller than the contact area between the fixed member 200 and the seal member 300. Thus, the fixed member 200 and the seal member 300 do not slide since the contact area is large and sliding resistance is also large, and the rotary member 100 and the seal member 300 slide. Thus, the fixed member 200 is not required for using a generally low strength and expensive low sliding member, and can select a material advantageous in terms of strength and cost. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a seal structure of a rotating part in which a seal member is disposed between two relatively rotating members.

  A seal structure in which a seal member such as an O-ring is disposed between the fixed member and the rotary member to prevent fluid from leaking outside is well known. As the rotating member rotates, the rotating member and the seal member slide, and the fixed member and the seal member also slide. Therefore, in order to reduce sliding resistance and wear of the seal member, The fixed member and the rotating member are formed of a material having a small friction coefficient (hereinafter referred to as a low sliding material).

  However, since the low sliding material generally has low strength and high cost, forming both the fixed member and the rotating member with the low sliding material has a large loss in terms of reliability and cost. there were.

  In view of the above points, an object of the present invention is to provide a seal structure that is advantageous in terms of reliability and cost.

  According to a first aspect of the present invention, there is provided a seal structure between a first member (31, 100) and a second member (26, 200) that rotate relative to each other about a rotation axis (A). The contact area between the one member (31, 100) and the seal member (35, 300 to 330) is made smaller than the contact area between the second member (26, 200) and the seal member (35, 300 to 330). Yes.

  In such a configuration, the second member (26, 200) and the seal member (35, 300 to 330) do not slide because the contact area is large and the sliding resistance is large, and the first member (31, 100) and The seal member (35, 300 to 330) slides. Therefore, the second member (26, 200) can select a material that is more advantageous in terms of strength and cost than the first member (31, 100).

  In this case, the first member (31, 100) and the seal member (35, 300, 310) are brought into contact with one line contact portion, and the second member (26, 200) and the seal member (35, 300, 310) are brought into contact with each other. It can be made to contact in a some line contact part. In this way, a contact area difference can be ensured reliably.

  Also, the second member (26, 200) is provided with a groove (26d, 202) having a rectangular cross-sectional shape and an annular shape, and the bottom (26e, 202a) of the groove is a plane perpendicular to the rotation axis (A). The seal member (35, 300) can be brought into contact with the bottom (26e, 202a) of the groove and at least one of the inner peripheral surface (26f, 202b) and the outer peripheral surface (26g, 202c) of the groove.

  If it does in this way, a 2nd member (26, 200) and a sealing member (35, 300) can be made to contact in a some line contact part, and a contact area difference can be ensured reliably.

  The sealing member (310) has a cross-sectional shape having three or more top portions (310a, 310b), one top portion (310a) is in contact with the first member (100), and a plurality of top portions (310b) Two members (200) can be contacted.

  If it does in this way, a 2nd member (200) and a sealing member (310) can be made to contact in a some line contact part, and a contact area difference can be ensured reliably.

  Moreover, let the sealing member (320,330) be the cross-sectional shape which has a top part (320a, 330a) and a plane part (320b, 330b), and makes the top part (320a, 330a) of a sealing member contact the 1st member (100). At the same time, the planar portions (320b, 330b) can be brought into contact with the second member (200). In this way, a contact area difference can be ensured reliably.

  According to a second aspect of the present invention, there is provided a seal structure between a first member (100) and a second member (200) that rotate relatively around a rotation axis (A), the first member (100). ) And the seal member (300) is made smaller than the friction coefficient between the second member (200) and the seal member (300).

  In such a configuration, since the second member (200) and the seal member (300) do not slide, the second member (200) selects a material that is more advantageous in terms of strength and cost than the first member (100). be able to.

  In this case, the first member (100) includes a contact member (110) that contacts the seal member (300) and a non-contact member (120) that does not contact the seal member (300), and the contact member (110). And the seal member (300) can be made smaller than the friction coefficient between the second member (200) and the seal member (300).

  In such a configuration, a material that is advantageous in terms of strength and cost can be selected for the non-contact member (110) in the first member (100).

  In addition, the code | symbol in the bracket | parenthesis of each means described in a claim and this column shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
A first embodiment of the present invention will be described. FIG. 1 is a cross-sectional view of a main part showing a seal structure according to a first embodiment of the present invention.

  As shown in FIG. 1, a rotating member 100 as a first member that rotates about a rotation axis A is made of resin, and a fluid passage 101 is formed at the center. Further, one end face 100 a of the rotating member 100 in the direction of the rotation axis A is a plane perpendicular to the rotation axis A.

  A fixing member 200 as a second member fixed to a case (not shown) is made of resin, and a fluid passage 201 communicating with the fluid passage 101 of the rotating member 100 is formed at the center.

  Further, the one end surface 200 a of the fixed member 200 in the direction of the rotation axis A is opposed to the one end surface 100 a of the rotating member 100. A groove 202 having a rectangular cross-sectional shape and a ring shape is formed on one end face 200a of the fixing member 200 so as to surround the opening end of the fluid passage 201. In this groove 202, an EPDM (ethylene / propylene) is formed. A seal member 300 made of an elastic material such as diene copolymer rubber) or NBR (acrylonitrile butadiene rubber) is inserted. In this embodiment, as the seal member 300, an O-ring having a circular cross-sectional shape and an annular shape is used.

  The bottom 202a of the groove 202 is a plane perpendicular to the rotation axis A. The diameter of the inner peripheral surface 202b of the groove 202 is set smaller than the inner diameter of the seal member 300 in the free state, and the diameter of the outer peripheral surface 202c of the groove 202 is set smaller than the outer diameter of the seal member 300 in the free state.

  According to the above configuration, the seal member 300 is in line contact with the one end surface 100 a of the rotating member 100. Further, the seal member 300 is in line contact with the bottom portion 202 a of the groove 202 and the outer peripheral surface 202 c of the groove 202 in the fixing member 200.

  In this specification, contact of the curved surface portion of the seal member 300 in a free state with a flat surface is referred to as line contact. Therefore, since the seal member 300 in use is compressed and deformed, the seal member 300 in use is in contact with each surface 100a, 202a, 202c with a certain width, but this is also a category of line contact in this specification. include.

  As described above, the rotating member 100 and the seal member 300 are in contact with each other at one line contact portion, and the fixed member 200 and the seal member 300 are in contact at two line contact portions, and the rotation member 100 and the seal member 300 are in contact with each other. The area is smaller than the contact area between the fixing member 200 and the seal member 300.

  For this reason, the fixed member 200 and the seal member 300 having a large contact area have a large sliding resistance, the fixed member 200 and the seal member 300 do not slide, and the rotating member 100 and the seal member 300 slide. Therefore, the fixing member 200 can select a material that is more advantageous in terms of strength and cost than the rotating member 100.

  For example, the rotating member 100 is made of a material having a small friction coefficient with the seal member 300, such as nylon that does not contain glass fiber or PPS (polyphenylene sulfide) that does not contain glass fiber, and the fixing member 200 is made of nylon containing glass fiber or the like. In addition, it is possible to employ a material having high strength and relatively inexpensive such as PPS containing glass fiber.

  In this embodiment, the sealing member 300 is in line contact with the bottom 202a of the groove 202 and the outer peripheral surface 202c of the groove 202 in the fixing member 200. However, the inner part of the bottom 202a and groove 202 of the groove 202 in the fixing member 200 The seal member 300 may be in line contact with the peripheral surface 202b. In this case, the diameter of the inner peripheral surface 202b of the groove 202 is made larger than the inner diameter of the seal member 300 in the free state, and the diameter of the outer peripheral surface 202c of the groove 202 is made larger than the outer diameter of the seal member 300 in the free state. .

  Moreover, in this embodiment, although the example which only a 1st member rotates among the 1st member which is the rotation member 100, and the 2nd member which is the fixing member 200 was shown, the seal structure of this embodiment is the 1st member. The second member can be applied to a rotating part that rotates relatively. That is, both the first member and the second member may rotate, or the first member may be fixed and the second member may rotate. Similarly, the seal structure of each embodiment to be described later can also be applied to a rotating portion in which the first member and the second member rotate relatively.

(Second Embodiment)
A second embodiment of the present invention will be described. FIG. 2 is a cross-sectional view of a main part showing a seal structure according to a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 2, in this embodiment, a seal member 310 having a V-shaped cross section and continuous in an annular shape is used. This seal member 310 has a top 310 a of a V-shaped mountain fold, and tops 310 b of both ends of the V-shape, and the top 310 a of the mountain fold is in line contact with one end surface 100 a of the rotating member 100. The two top portions 310 b at both ends are in line contact with the bottom portion 202 a of the groove 202 in the fixing member 200.

  Therefore, the fixed member 200 and the seal member 310 having a large contact area have a large sliding resistance, the fixed member 200 and the seal member 310 do not slide, and the rotating member 100 and the seal member 310 slide. Therefore, the fixing member 200 can select a material more advantageous in terms of strength and cost than the rotating member 100.

(Third embodiment)
A third embodiment of the present invention will be described. FIG. 3 is a cross-sectional view of a main part showing a seal structure according to a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 3, in the present embodiment, a seal member 320 having a triangular cross-sectional shape and an annular shape is used. The seal member 320 has three top portions 320a and three flat portions 320b. One top portion 320a is in line contact with one end surface 100a of the rotating member 100, and one flat portion 320b is the fixing member 200. In surface contact with the bottom 202a of the groove 202.

  Therefore, the fixed member 200 and the seal member 320 having a large contact area have a large sliding resistance, the fixed member 200 and the seal member 320 do not slide, and the rotating member 100 and the seal member 320 slide. Therefore, the fixing member 200 can select a material more advantageous in terms of strength and cost than the rotating member 100.

(Fourth embodiment)
A fourth embodiment of the present invention will be described. FIG. 4 is a cross-sectional view of a main part showing a seal structure according to a fourth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  As shown in FIG. 4, in this embodiment, a seal member 330 having a D-shaped cross section and continuous in an annular shape is used. This seal member 330 has a top portion 330 a of an arcuate portion and one flat surface portion 330 b, the top portion 330 a is in line contact with one end surface 100 a of the rotating member 100, and the flat surface portion 330 b is a groove in the fixing member 200. Surface contact with the bottom 202a of 202.

  Therefore, the fixed member 200 and the seal member 330 having a large contact area have a large sliding resistance, the fixed member 200 and the seal member 330 do not slide, and the rotating member 100 and the seal member 330 slide. Therefore, the fixing member 200 can select a material more advantageous in terms of strength and cost than the rotating member 100.

(Fifth embodiment)
A fifth embodiment of the present invention will be described. FIG. 5 is a cross-sectional view of a main part showing a seal structure according to a fifth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 1st Embodiment, and the description is abbreviate | omitted.

  In the first embodiment, by making the contact area between the rotating member 100 and the seal member 300 smaller than the contact area between the fixed member 200 and the seal member 300, the fixed member 200 and the seal member 300 do not slide and rotate. The member 100 and the seal member 300 are slid, but in this embodiment, the friction coefficient between the rotating member 100 and the seal member 300 is made smaller than the friction coefficient between the fixed member 200 and the seal member 300. The fixing member 200 and the seal member 300 do not slide, but the rotating member 100 and the seal member 300 slide.

  As shown in FIG. 5, the diameter of the outer peripheral surface 202c of the groove 202 of the fixing member 200 is set larger than the outer diameter of the seal member 300 in the free state. Therefore, the seal member 300 is in line contact with the one end surface 100 a of the rotating member 100 and line contact with the bottom 202 a of the groove 202 in the fixing member 200.

  Then, when the friction coefficient between the rotating member 100 and the seal member 300 is μ1, and the friction coefficient between the fixing member 200 and the seal member 300 is μ2, the rotating member 100, the fixing member 200, and the seal are such that μ1 <μ2. The material of the member 300 is selected.

  For example, the rotating member 100 is made of nylon not containing glass fiber or PPS not containing glass fiber, the fixing member 200 is made of nylon containing glass fiber or PPS containing glass fiber, and the sealing member 300 is made of EPDM or NBR, whereby μ1 < μ2.

  Further, the rotation member 100 is made of glass fiber nylon, the fixing member 200 is made of glass fiber PPS, and the seal member 300 is made of EPDM or NBR, whereby μ1 <μ2.

  In this way, by setting μ1 <μ2, the fixing member 200 and the seal member 300 do not slide, and the rotating member 100 and the seal member 300 slide. Therefore, the fixing member 200 can select a material that is more advantageous in terms of strength and cost than the rotating member 100.

(Sixth embodiment)
A sixth embodiment of the present invention will be described. FIG. 6 is a cross-sectional view of a main part showing a seal structure according to a sixth embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same or equivalent part as 5th Embodiment, and the description is abbreviate | omitted.

  In the fifth embodiment, the entire rotating member 100 is formed of a material having a small friction coefficient. However, the rotating member 100 of the present embodiment has a thin disk shape that contacts the seal member 300 as shown in FIG. The contact member 110 and the non-contact member 120 that does not contact the seal member 300 are configured. The rotating member 100 is formed by joining the contact member 110 and the non-contact member 120 by welding or by insert molding.

  Then, when the friction coefficient between the contact member 110 and the seal member 300 is μ1, and the friction coefficient between the fixed member 200 and the seal member 300 is μ2, the contact member 110, the fixed member 200, and the seal are such that μ1 <μ2. The material of the member 300 is selected.

  According to this embodiment, the non-contact member 120 can also select a material advantageous in terms of strength and cost.

(Seventh embodiment)
A seventh embodiment of the present invention will be described. FIG. 7 is a schematic cross-sectional view of the indoor air conditioning unit 10 in the vehicle air conditioner using the seal structure according to the seventh embodiment of the present invention.

  The indoor air conditioning unit 10 is disposed at a substantially central portion in the left-right direction of the vehicle inside an instrument panel (not shown) at the front of the vehicle interior. In addition, each arrow before and behind in FIG. 7 shows the direction in a vehicle mounting state. Further, the direction perpendicular to the plane of FIG. 7 is the vehicle left-right (width) direction.

  The indoor air-conditioning unit 10 includes a resin air-conditioning case 11 that forms a passage for air flowing toward the passenger compartment. The air-conditioning case 11 is actually formed as a plurality of divided case bodies for convenience in resin molding, assembly of built-in parts, and the like, and the plurality of divided case bodies are integrated by fastening means such as screws and clips. The air-conditioning case 11 is configured by fastening to.

  And in this embodiment, it is the structure which has arrange | positioned the air blower part 12 integrally in the upper part of the vehicle front side among the air-conditioning cases 11. FIG. The blower unit 12 is configured to rotationally drive a centrifugal blower fan 12a by an electric motor (not shown). An inside / outside air switching box (not shown) is connected to the suction port of the blower fan 12a, and the introduced air (inside air or outside air) from the inside / outside air switching box is sent from the top to the bottom as indicated by the arrow a by the blower fan 12a. It is designed to blow air toward you.

  An evaporator 13 serving as a heat exchanger for cooling is disposed in a lower portion of the air conditioning case 11 on the front side of the vehicle. The outer shape of the evaporator 13 is a rectangular parallelepiped thin shape, and the entire amount of air blown from the blower unit 12 passes as shown by an arrow b. As is well known, the evaporator 13 is a low pressure side heat exchanger of the vapor compression refrigeration cycle, and cools the passing air by absorbing heat from the passing air indicated by the arrow b and evaporating the low pressure refrigerant.

  A drain port 14 is provided at the lowest part of the bottom surface of the air conditioning case 11, and condensed water generated in the evaporator 13 is drained from the drain port 14 to the outside of the passenger compartment.

  In the air conditioning case 11, a heater core 15 is disposed on the leeward side of the evaporator 13. More specifically, the heater core 15 is disposed on the vehicle rear side of the evaporator 13 and in an upper portion. Here, the heater core 15 is a heating heat exchanger that heats air using hot water (engine cooling water) from a vehicle engine (not shown) as a heat source fluid.

  The heater core 15 is connected to a coaxial double pipe portion 16 for hot water entering / exiting to be described later, and the heater core 15 rotates relative to the air conditioning case 11 around the rotation axis A of the coaxial double pipe portion 16. ing. The coaxial double pipe portion 16 is disposed adjacent to the rear side of the upper end portion of the evaporator 13.

  A windshield wall 17 for maximum cooling is integrally formed in the air conditioning case 11 between the evaporator 13 and the heater core 15. The wind shielding wall 17 is formed in a plate shape that hangs vertically from a portion between the upper end portion of the evaporator 13 and the hot water outlet tank 15 a at the upper end portion of the heater core 15.

  The plate-shaped wind shielding wall 17 is formed in the entire area inside the air conditioning case 11 with respect to the vehicle left-right direction (perpendicular to the plane of FIG. 7). Coupled to the side wall.

  The plate-like wind shielding wall 17 is formed in substantially the same area as the heater core 15 so as to cover the entire windward surface (the left side surface in FIG. 7) of the heater core 15. A predetermined gap is set between the lower end portion of the wind shielding wall 17 and the hot water inlet tank 15b at the lower end portion of the heater core 15 and the bottom surface portion of the air conditioning case 11, and the air passage 18 on the upper side of the heater core is defined by the predetermined gap. Is formed. That is, the air passage 18 is formed in a region on the windward side with respect to the rotation operation region of the heater core 15.

  The heater core 15 is rotated to a broken line position MC along the leeward side surface (the right side surface in FIG. 7) of the wind shielding wall 17 during maximum cooling. In the maximum cooling position MC, the wind shielding wall 17 fully closes the windward surface of the heater core 15 and prevents the air on the leeward side of the evaporator 13 from passing through the core portion of the heater core 15.

  Accordingly, since the entire amount of the air passing through the evaporator (cold air) flows by bypassing the heater core 15 as indicated by the arrow c, the maximum cooling performance can be exhibited. For this reason, the air passage 18 on the upper side of the heater core acts as a heater core bypass passage during maximum cooling.

  Seal ribs 20 are formed on the leeward side of the heater core 15 on the inner wall surface of the air conditioning case 11. The seal rib 20 is integrally formed on the inner wall surface of the air conditioning case 11 and constitutes a case-side seal surface during maximum heating.

  Specifically, the seal rib 20 projects in a frame shape from the inner wall surface of the air conditioning case 11 toward the inside of the air conditioning case 11. An opening 20a through which air can pass is opened at the center of the frame-like protruding shape.

  During maximum heating, the heater core 15 is rotated to the alternate long and short dash line position MH, and the rectangular peripheral edge of the heater core 15 is pressed against the frame-like protruding shape of the seal rib 20. Thereby, the heater core bypass passage in which the air passage 18 and the opening portion 20a directly communicate with each other is blocked during maximum heating, and the opening portion 20a is formed between the hot water inlet tank 15b at the lower end portion of the heater core 15 and the inner wall surface of the bottom surface portion of the air conditioning case 11. The bypass air flow (cold air flow) c which goes directly to is cut off.

  For this reason, since the whole quantity of blowing air in the air conditioning case 11 passes through the core part of the heater core 15 and is heated, the maximum heating performance can be exhibited. The warm air d that has passed through the core portion of the heater core 15 passes through the opening 20a of the seal rib 20 and flows to the leeward side.

  Moreover, the solid line position of FIG. 7 of the heater core 15 is an example of an intermediate opening (intermediate rotation position) at the time of temperature control. Since the flow on the side bypasses the heater core 15 as indicated by the arrow c, and the upper flow of the evaporator passing air (cold air) passes through the heater core 15 and is heated as indicated by the arrow d ′, It becomes hot air d.

  Therefore, by adjusting the rotation position of the heater core 15, the air volume ratio between the cold air that bypasses the heater core 15 and the hot air that passes through the heater core 15 can be adjusted to continuously adjust the temperature of the air blown into the vehicle interior.

  After the cold air that bypasses the heater core 15 and the warm air that passes through the heater core 15 pass through the opening 20a of the seal rib 20 and are mixed in the upper region 21 of the seal rib 20, the air is conditioned at a desired temperature. , Flows into the blowout openings 22, 23, 24.

  Next, the arrangement of the blowout openings 22, 23, and 24 for blowing air to each part of the vehicle interior will be described. The blowout openings 22, 23, and 24 are arranged in the vehicle rear side portion of the blower unit 12 in the air conditioning case 11.

  The defroster opening 22 is disposed on the upper surface of the air conditioning case 11 and is connected to a defroster outlet on the upper surface of the vehicle instrument panel via a defroster duct (not shown). Air is directed from the defroster outlet toward the inner surface of the front window glass of the vehicle. Blow out.

  The face opening 23 is disposed at a rear side of the vehicle with respect to the defroster opening 22. The face opening 23 is divided into a center face opening (not shown) and a side face opening (not shown).

  A center face duct (not shown) is connected to the center face opening, and a front end outlet (center face outlet) of the center face duct is disposed at the center in the left-right direction of the vehicle instrument panel, from which the passenger face side Blow air into

  A side face duct (not shown) is connected to the side face opening, and a tip outlet (side face outlet) of the side face duct is arranged at both ends in the left-right direction of the vehicle instrument panel, from which the passenger face side Or air is blown out to the vehicle side window glass side.

  The foot opening 24 is disposed on the left and right side walls of the air conditioning case 11 and blows air to the feet of the occupant through a foot duct (not shown). The defroster opening 22, the face opening 23, and the foot opening 24 are opened and closed by a blowing mode door (not shown).

  Next, the heater core 15 and the hot / cold double pipe section 16 will be described. FIG. 8 is a cross-sectional view showing the heater core 15 and the coaxial double pipe portion 16 of FIG. 7, in which a hot water inlet tank 15 b is arranged at the lower end portion of the heater core 15 and a hot water outlet tank 15 a is arranged at the upper end portion of the heater core 15. Yes. And between these tanks 15a and 15b, the core part 15e of the all-pass type (namely, one-way flow type) is comprised by the laminated structure of the some flat tube 15c and the corrugated heat transfer fin 15d.

  Here, the plurality of flat tubes 15c are arranged in parallel in a line in the left-right direction of the vehicle, the lower ends of all the flat tubes 15c communicate with the hot water inlet tank 15b, and the upper ends communicate with the hot water outlet tank 15a. . For this reason, the warm water flows in one direction from the warm water inlet tank 15b through all the flat tubes 15c in parallel to the warm water outlet tank 15a.

  Both tanks 15a and 15b are elongated in the direction in which the flat tubes 15c are arranged (the vehicle left-right direction). The blown air in the air conditioning case 11 is heated by passing through the gaps between the flat tubes 15c and the corrugated heat transfer fins 15d.

  A coaxial double pipe portion 16 is disposed at one end side of the hot water outlet tank 15a (extending direction in the tank longitudinal direction), and a coaxial double pipe portion is disposed at the other end side of the hot water outlet tank 15a. A cylindrical shaft portion 15 f is integrally provided coaxially with the 16 rotation axes A. The shaft portion 15 f is inserted into the hole of the air conditioning case 11 and is rotatably supported by the air conditioning case 11.

  Further, one end of the shaft portion 15 f is connected to a rotation drive mechanism (not shown) outside the air conditioning case 11. The rotational drive mechanism includes, for example, a power transmission mechanism such as a link mechanism and a gear mechanism coupled to the shaft portion 15f, and a drive mechanism such as a servo motor that applies a rotational driving force to the shaft portion 15f via the power transmission mechanism. Consists of. The rotation drive mechanism may be a manual mechanism that is operated by the manual operation force of the occupant.

  The coaxial double pipe section 16 is roughly divided into a fixing member 16a fixed to the air conditioning case 11 side by an unillustrated attachment means such as screwing and a rotating member 16b that is joined to the heater core 15 and rotates together with the heater core 15. . And most of the fixing member 16 a is located outside the air conditioning case 11, and the rotating member 16 b is located inside the air conditioning case 11.

  The fixed member 16a includes a cylindrical fixed-side inner pipe 25 extending in the direction of the rotation axis A, and a cylindrical fixed-side outer pipe 26 positioned at a predetermined interval on the outer peripheral side of the fixed-side inner pipe 25. Yes. The fixed side inner pipe 25 and the fixed side outer pipe 26 of the fixing member 16a are coaxial with the rotation axis A as the center.

  An inlet pipe 28 that allows hot water from the vehicle engine to flow into the internal passage of the fixed side outer pipe 26 is coupled to the fixed side outer pipe 26. The inlet pipe 28 extends in a direction perpendicular to the rotation axis A.

  Further, the fixed side inner pipe 25 is coupled to an outlet pipe 29 that allows hot water to flow out from the internal passage of the fixed side inner pipe 25 to the vehicle engine. The outlet pipe 29 extends in a direction perpendicular to the rotation axis A. More specifically, the outlet pipe 29 extends to the outside of the fixed side outer pipe 26 across the internal passage of the fixed side outer pipe 26.

  In the fixing member 16a, a fixed side inner pipe 25, a fixed side outer pipe 26, an inlet pipe 28, and an outlet pipe 29 are integrally formed of a resin material.

  On the other hand, the rotating member 16b includes a cylindrical rotation-side inner pipe 30 extending in the direction of the rotation axis A, and a cylindrical rotation-side outer pipe 31 positioned at a predetermined interval on the outer peripheral side of the rotation-side inner pipe 30. A communication pipe 32 that communicates with the internal passage of the rotation-side outer pipe 31 and extends from the outer periphery of the rotation-side outer pipe 31 in a direction perpendicular to the rotation axis A is provided. As for the rotation member 16b, the rotation side inner side piping 30, the rotation side outer side piping 31, and the connection piping 32 are integrally molded with the resin material.

  One end of the rotation side inner pipe 30 is fitted in a watertight manner so as to be rotatable on the inner peripheral side of the fixed side inner pipe 25 and so as not to leak water. The rotation side inner pipe 30 and the fixed side inner pipe 25 are Communicate. Of this rotating side inner pipe 30, the end opposite to the fixed side inner pipe 25 communicates with one end in the longitudinal direction of the hot water outlet tank 15a.

  The end of the rotation side outer pipe 31 is rotatably fitted to the inner peripheral side of the fixed side outer pipe 26, and the rotation side outer pipe 31 and the fixed side outer pipe 26 communicate with each other. Further, the communication pipe 32 communicates with one end in the longitudinal direction of the hot water inlet tank 15b through a hose or the like (not shown). The rotation side outer pipe 31 corresponds to the first member of the present invention, and the fixed side outer pipe 26 corresponds to the second member of the present invention.

  An arrow W in FIG. 8 indicates a hot water flow channel, and the hot water flowing into the inlet pipe 28 from the hot water circuit of the vehicle engine is the internal passage of the fixed outer pipe 26 → the inner passage of the rotary outer pipe 31 → the connecting pipe. It flows into the warm water inlet tank 15b through 32 internal passages. The hot water is distributed to the plurality of flat tubes 15c in the hot water inlet tank 15b, and flows in the plurality of flat tubes 15c from the bottom to the top.

  Hot water from the plurality of flat tubes 15 c flows into the hot water outlet tank 15 a and gathers, passes through the internal passage of the rotation-side inner pipe 30 → the internal passage of the fixed-side inner pipe 25, and flows out to the outlet pipe 29. Then, the warm water is returned to the warm water circuit of the vehicle engine.

  Next, the seal part 33 in the coaxial double pipe part 16 will be described. FIG. 9 is an enlarged cross-sectional view of the seal portion 33 in the coaxial double pipe portion 16 of FIG.

  As shown in FIG. 9, a disc-shaped flange 34 extending integrally outward in the vertical direction with respect to the rotation axis A (see FIG. 8) is integrally provided on the outer peripheral portion of the rotation-side outer pipe 31. . One end surface 34 a of the flange 34 in the direction of the rotation axis A is a plane perpendicular to the rotation axis A.

  The fixed-side outer pipe 26 includes a cylindrical pipe part 26a that forms a passage through which hot water flows, and a bowl-like bowl-shaped circle that extends outward from the end of the pipe part 26a in the direction perpendicular to the rotation axis A. It has the ring part 26b and the cylindrical cylindrical ring part 26c extended in the rotating shaft A direction from the outer peripheral part of the bowl-shaped ring part 26b. The flange-shaped annular portion 26 b faces the one end surface 34 a of the flange portion 34, and the cylindrical annular portion 26 c is located on the outer peripheral side of the flange portion 34 and covers the flange portion 34.

  A groove 26d having a rectangular cross-sectional shape and an annular shape is formed on a surface of the flange-shaped annular portion 26b facing the one end surface 34a of the flange 34, and an elastic body such as EPDM or NBR is formed in the groove 26d. The sealing member 35 having a circular cross-sectional shape and continuous in an annular shape is inserted.

  The bottom portion 26e of the groove 26d is a plane perpendicular to the rotation axis A. The diameter of the inner peripheral surface 26f of the groove 26d is smaller than the inner diameter of the seal member 35 in the free state, and the diameter of the outer peripheral surface 26g of the groove 26d is set smaller than the outer diameter of the seal member 35 in the free state.

  According to this configuration, the seal member 35 is in line contact with the one end surface 34 a of the flange portion 34. Further, the seal member 35 is in line contact with the bottom portion 26e of the groove 26d and the outer peripheral surface 26g of the groove 26d in the bowl-shaped annular portion 26b.

  Thus, the rotation side outer pipe 31 and the seal member 35 in the rotation member 16b (see FIG. 8) are in contact with each other at one line contact portion, and the fixed side outer pipe 26 and the seal member 35 in the fixing member 16a (see FIG. 8) Are in contact with each other at two line contact portions, and the contact area between the rotation-side outer pipe 31 and the seal member 35 is smaller than the contact area between the fixed-side outer pipe 26 and the seal member 35.

  For this reason, the sliding resistance of the fixed outer pipe 26 and the seal member 35 having a large contact area increases, the fixed outer pipe 26 and the sealing member 35 do not slide, and the rotating outer pipe 31 and the sealing member 35 slide. Move. Therefore, the fixing member 16a including the fixed side outer pipe 26 can select a material that is more advantageous in terms of strength and cost than the fixing member 16a including the rotation side outer pipe 31.

  For example, the rotation-side outer pipe 31 is made of a material having a small coefficient of friction with the seal member 35, such as nylon that does not contain glass fiber or PPS (polyphenylene sulfide) that does not contain glass fiber. A material with high strength and relatively low cost, such as nylon with fibers and PPS with glass fibers, can be used.

  In this embodiment, the seal member 35 having a circular cross-sectional shape and an annular shape is used. However, the seal member having a V-shaped cross-sectional shape as shown in FIG. 2 and a cross-section as shown in FIG. Using a seal member having a triangular shape and a continuous ring shape, and a seal member having a D-shaped cross-section as shown in FIG. 4, the contact area between the rotation-side outer pipe 31 and the seal member 35 is fixed. You may make it become smaller than the contact area of the outer side piping 26 and the sealing member 35. FIG.

  Further, by making the friction coefficient between the rotation side outer pipe 31 and the seal member 35 smaller than the friction coefficient between the fixed side outer pipe 26 and the seal member 35, the fixed side outer pipe 26 and the seal member 35 do not slide. The rotation side outer pipe 31 and the seal member 35 may slide.

  In the present embodiment, warm water is introduced from the inlet pipe 28 and flows to the heater core 15, but warm water may be introduced from the outlet pipe 29 to flow to the heater core 15. That is, the configuration in which the hot water flow direction W is reversed in FIG.

  In this embodiment, the rotation side inner pipe 30 is fitted to the inner peripheral side of the fixed side inner pipe 25, but conversely, the rotation side inner pipe 30 is fitted to the outer peripheral side of the fixed side inner pipe 25. You may make it match.

  In the present embodiment, the coaxial double pipe portion 16 and the shaft portion 15f for warm water in / out are arranged on one end side (the hot water outlet tank 15a side) of the heater core 15, but the coaxial double pipe portion 16 and the shaft portion 15f are connected to the heater core. 15 may be arranged at an intermediate position between the hot water inlet tank 15b and the hot water outlet tank 15a.

  In the present embodiment, as the heater core 15, a so-called all-pass type (that is, a one-way flow type) is used in which the hot water passes from the hot water inlet tank 15b through all the tubes 15c to the hot water outlet tank 15a. As the heater core 15, a front / rear U-turn type in which a hot water flow is U-turned before and after the air flow direction may be used, and the present invention may be applied to the front / rear U-turn type heater core 15. Similarly, as the heater core 15, a left / right U-turn type that makes a hot water flow U-turn in the left / right direction of the heater core (left / right direction in FIG. 8) is used. Good.

  In the present embodiment, the fixing member 16a of the coaxial double pipe portion 16 is formed separately from the air conditioning case 11, but both the fixing member 16a and the air conditioning case 11 are resin members. 16a may be integrally formed with the air conditioning case 11 with resin.

  In the present embodiment, the example in which the hot water of the vehicle engine is circulated to the heater core 15 has been described. However, the hot water heated by the in-vehicle heat source device such as a combustion heater or a fuel cell is circulated to the heater core 15. May be. In addition, as the heat source fluid to be circulated through the heater core 15, hydraulic oil or the like for hydraulic equipment may be used instead of hot water.

It is sectional drawing of the principal part which shows the seal structure which concerns on 1st Embodiment of this invention. It is sectional drawing of the principal part which shows the seal structure which concerns on 2nd Embodiment of this invention. It is sectional drawing of the principal part which shows the seal structure which concerns on 3rd Embodiment of this invention. It is sectional drawing of the principal part which shows the seal structure which concerns on 4th Embodiment of this invention. It is sectional drawing of the principal part which shows the seal structure which concerns on 5th Embodiment of this invention. It is sectional drawing of the principal part which shows the seal structure which concerns on 6th Embodiment of this invention. It is a schematic sectional drawing of the indoor air-conditioning unit part 10 in the vehicle air conditioner using the seal structure which concerns on 7th Embodiment of this invention. It is sectional drawing which shows the heater core 15 and the coaxial double piping part 16 of FIG. It is an expanded sectional view of the seal part 33 in the coaxial double piping part 16 of FIG.

Explanation of symbols

  26, 200 ... second member, 31, 100 ... first member, 35, 300-330 ... sealing member, A ... rotating shaft.

Claims (11)

Between the first member (31, 100) and the second member (26, 200) that rotate relatively around the rotation axis (A), an annular seal member (35, 300 to 330) made of an elastic body is provided. It is a seal structure of the arranged rotating part,
The contact area between the first member (31, 100) and the seal member (35, 300 to 330) is the contact area between the second member (26, 200) and the seal member (35, 300 to 330). The rotating part seal structure characterized by being smaller than the above. The first member (31, 100) and the seal member (35, 300, 310) are in contact with each other at one line contact portion, and the second member (26, 200) and the seal member (35, 300, 310) are in contact with each other. The rotating structure seal structure according to claim 1, wherein a plurality of line contact portions are in contact with each other. The second member (26, 200) includes a groove (26d, 202) having a rectangular cross-sectional shape and an annular shape.
The groove (26d, 202) is a plane whose bottom (26e, 202a) is perpendicular to the rotation axis (A),
The seal member (35, 300) contacts the bottom (26e, 202a) of the groove and contacts at least one of the inner peripheral surface (26f, 202b) and the outer peripheral surface (26g, 202c) of the groove. The seal structure for a rotating part according to claim 2, wherein: The sealing structure for a rotating part according to claim 3, wherein the sealing member (35, 300) has a circular cross-sectional shape. The sealing member (310) has a cross-sectional shape having three or more top portions (310a, 310b),
The top portion (310a) is in contact with the first member (100), and the top portions (310b) are in contact with the second member (200). Rotating part seal structure. The seal structure of the rotating part according to claim 5, wherein the cross-sectional shape of the seal member (310) is V-shaped. The seal member (320, 330) has a cross-sectional shape having a top portion (320a, 330a) and a flat portion (320b, 330b),
The top part (320a, 330a) of the sealing member is in contact with the first member (100), and the flat part (320b, 330b) is in contact with the second member (200). Item 2. The rotating part seal structure according to Item 1. The seal structure of the rotating part according to claim 7, wherein the cross-sectional shape of the seal member (320) is a triangle. The sealing structure of a rotating part according to claim 7, wherein a cross-sectional shape of the seal member (330) is a D-shape. A seal structure of a rotating part in which an annular seal member (300) made of an elastic body is disposed between a first member (100) and a second member (200) that rotate relatively around a rotation axis (A). There,
A rotating part seal characterized in that a friction coefficient between the first member (100) and the sealing member (300) is smaller than a friction coefficient between the second member (200) and the sealing member (300). Construction. The first member (100) includes a contact member (110) that contacts the seal member (300) and a non-contact member (120) that does not contact the seal member (300).
The friction coefficient between the contact member (110) and the seal member (300) is smaller than the friction coefficient between the second member (200) and the seal member (300). Rotating part seal structure.

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