Motor and valve device

Abstract

A motor (10) comprises: a rotor shaft (12a) rotatably supported inside a stator (11); a motor shaft (15) supported inside the rotor shaft (12a) and reciprocating in the axial direction in association with rotation of the rotor shaft (12a); a boss (14) provided on the stator (11) and penetrating the motor shaft (15) to regulate rotation of the motor shaft (15); an annular seal member (16) provided inside the boss (14) and having an inner circumferential end abutting an outer circumferential surface of the rotor shaft (12a); a respiratory hole (16e) penetrating the seal member (16) in the radial direction; a waterproof moisture-permeable member (17) provided on the outer circumferential surface of the seal member (16) so as to cover the respiratory hole (16e); and a presser ring (18) provided on a radially outer side of the seal member (16) and pressing the waterproof moisture-permeable member (17) against the outer circumferential surface of the seal member (16).

Description

[Technical field]

[0001] The present disclosure relates to motors and valve arrangements. [Background technology]

[0002] There is a direct-acting motor. In this direct-acting motor, the motor shaft serving as the output shaft can be moved back and forth in the axial direction by rotating the rotor. Such a conventional motor is disclosed in, for example, Patent Document 1. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2005-83278 A Summary of the Invention [Problem to be solved by the invention]

[0004] The motor disclosed in Patent Document 1 includes a seal member. This seal member prevents foreign matter from entering the inside of the motor. An outer peripheral end of the seal member is attached to the inner surface of the housing. Meanwhile, an inner peripheral end of the seal member is attached to the outer peripheral surface of the motor shaft. Therefore, the seal member can maintain airtightness between the motor shaft and the housing even when the motor shaft moves back and forth in the axial direction.

[0005] In the motor disclosed in Patent Document 1, the inside of the motor is made airtight by a sealing member, so the air pressure inside the motor may fluctuate depending on the temperature change around the motor and the linear motion of the motor shaft, etc. Such fluctuations in air pressure affect the operation of the motor.

[0006] In order to suppress the air pressure fluctuation inside the motor, it is conceivable to provide a ventilation hole that connects the inside of the motor to the outside of the motor. However, if the ventilation hole is provided so as to open on the outer surface of the motor, there is a risk that foreign matter may enter the inside of the motor through the ventilation hole. Furthermore, providing the above ventilation hole requires a change in the shape of the exterior parts of the motor.

[0007] The present disclosure has been made to solve the above-mentioned problems, and aims to provide a motor that can suppress air pressure fluctuations inside the motor while preventing foreign matter from entering the motor, without changing the shape of the exterior parts. [Means for solving the problem]

[0008] A motor according to the present disclosure includes a rotor shaft rotatably supported inside a stator, a motor shaft supported inside the rotor shaft and reciprocating in an axial direction as the rotor shaft rotates, The top end Stator Attached to the bottom of , The bottom end Motor shaft Bottom edge of The motor shaft is then passed through the Cylindrical Boss and Boss's Embedded inside The seal comprises an annular sealing member whose inner peripheral end abuts the outer peripheral surface of the rotor shaft, a breathing hole that penetrates radially through the sealing member, a waterproof and moisture-permeable member that is arranged on the outer peripheral surface of the sealing member so as to cover the breathing hole, and a pressing ring that is arranged radially outside the sealing member and presses the waterproof and moisture-permeable member against the outer peripheral surface of the sealing member. Effect of the Invention

[0009] According to the present disclosure, it is possible to suppress air pressure fluctuations inside the motor while preventing foreign matter from entering the motor without changing the shape of the exterior components. [Brief description of the drawings]

[0010] [Figure 1] 1 is a vertical sectional view of an EGR valve device including a motor according to a first embodiment. [Diagram 2] FIG. 2 is an enlarged view of a main part of FIG. [Diagram 3] 13 is a view showing a state in which the pressing ring is assembled to the sealing member. FIG. [Figure 4] FIG. [Diagram 5] 5A and 5B are diagrams illustrating a configuration of a seal member, respectively: Fig. 5A is a plan view of the seal member, and Fig. 5B is a cross-sectional view taken along the line VV in Fig. 5A. [Figure 6] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In order to describe the present disclosure in more detail, embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0012] Embodiment 1 A motor 10 according to a first embodiment will be described with reference to Figs. 1 to 6. Fig. 1 is a vertical cross-sectional view of an EGR valve device including a motor 10 according to a first embodiment. Fig. 2 is an enlarged view of a main part of Fig. 1. Fig. 3 is a view showing a state in which a pressing ring 18 is assembled to a seal member 16. Fig. 4 is a perspective view of the seal member 16. Fig. 5 is a view showing a configuration of the seal member 16. Fig. 6 is a perspective view of the pressing ring 18. Note that the waterproof moisture permeable member 17 is omitted in Fig. 3. Also, Fig. 5A shows only one breathing hole 16e as a representative of the multiple breathing holes 16e.

[0013] Here, Fig. 1 shows an example in which the motor 10 according to the first embodiment is applied to a valve device. The valve device is assumed to be, for example, an EGR valve device of an exhaust gas recirculation (hereinafter referred to as EGR) system mounted on a vehicle. Fig. 1 shows the EGR valve device in a fully closed state. Also, the two-dot chain line in Fig. 1 shows the EGR valve device in a fully open state.

[0014] The EGR system is provided with an exhaust gas recirculation passage (hereinafter referred to as an EGR passage) for recirculating (returning) a portion of the exhaust gas (hereinafter referred to as EGR gas) from the exhaust passage to the intake passage in order to reduce harmful substances contained in the exhaust gas discharged from the combustion chamber of the vehicle engine. This EGR system is provided with an EGR valve device in the middle of the EGR passage in order to control the flow rate of the EGR gas. The EGR valve device controls the flow rate of the EGR gas by adjusting the valve opening.

[0015] As shown in Fig. 1, the EGR valve device includes a motor 10 and a valve housing 20. The lower part of the motor 10 and the upper part of the valve housing 20 are fixed to each other by using, for example, bolts or the like.

[0016] The motor 10 includes a stator 11, a rotor 12, a bearing 13, a boss 14, a motor shaft 15, a seal member 16, a waterproof and moisture-permeable member 17, and a retaining ring 18. The motor 10 is a so-called direct-acting motor that converts the rotation of the rotor 12 into the axial movement of the motor shaft 15. That is, the motor 10 rotates the rotor 12 relative to the stator 11, thereby enabling the motor shaft 15 to move back and forth in the axial direction.

[0017] The stator 11 constitutes the outer periphery of the motor 10. The stator 11 is formed in a substantially cylindrical shape. The stator 11 has, for example, a bobbin around which a coil is wound.

[0018] The rotor 12 is disposed radially inside the stator 11. The rotor 12 is rotatably supported on the inner circumferential surface of the stator 11 via a bearing 13. The rotor 12 includes, for example, a magnet and a rotor shaft 12a.

[0019] The magnet is disposed so as to face the coil of the stator 11 in the radial direction of the motor 10. The rotor shaft 12a is disposed in the center of the rotor 12. This rotor shaft 12a is formed in a substantially cylindrical shape. When the rotor 12 rotates, the rotor shaft 12a rotates together with the rotor 12. In addition, a female thread (not shown) is formed on the inner peripheral surface of the rotor shaft 12a. Such a rotor shaft 12a is formed of, for example, a resin material or a metal material.

[0020] On the other hand, the motor shaft 15 is inserted into the rotor shaft 12a. A male thread (not shown) is formed on the outer circumferential surface of the motor shaft 15. The male thread of the motor shaft 15 and the female thread of the rotor shaft 12a mesh with each other. Such a motor shaft 15 is made of a metal material. The female thread of the rotor shaft 12a and the male thread of the motor shaft 15 constitute a thread conversion mechanism.

[0021] 1 and 2, the boss 14 is attached to the lower part of the stator 11. The boss 14 is formed in a cylindrical shape such that the inner diameter gradually increases from the upper end to the lower end. The boss 14 is formed of, for example, a resin material. The boss 14 also has a support hole 14a and a fitting recess 14b.

[0022] The support hole 14a is disposed coaxially with the rotor shaft 12a. The support hole 14a is a hole formed in the lower end of the boss 14, and supports the motor shaft 15 so that the motor shaft 15 can reciprocate in the axial direction. The support hole 14a is formed, for example, in a rectangular shape.

[0023] The fitting recess 14b is formed in an annular shape on the radially outer side of the support hole 14a. The fitting recess 14b is formed to be recessed downward. That is, the fitting recess 14b opens upward. A seal member 16 is fitted into the fitting recess 14b, as will be described in detail later.

[0024] In response to this, the motor shaft 15 is provided with a rotation restricting portion 15a having a rectangular cross section. This rotation restricting portion 15a is always in a state of penetrating into the support hole 14a of the boss 14. When the rotation restricting portion 15a is inserted into the support hole 14a of the boss 14, the rotation of the motor shaft 15 around the central axis is restricted, and the motor shaft 15 is allowed to move back and forth in the axial direction.

[0025] The lower end of the rotor shaft 12a is disposed inside the boss 14 attached to the stator 11. The rotor shaft 12a is not in contact with the inner surface of the boss 14. Furthermore, a seal member 16, a waterproof, moisture-permeable member 17, and a pressing ring 18 are provided inside the boss 14. Details of the seal member 16, the waterproof, moisture-permeable member 17, and the pressing ring 18 will be described later.

[0026] 1, the valve housing 20 is provided so as to cover, from below, the boss 14 attached to the lower part of the stator 11. The valve housing 20 is formed with an internal space 20a, an atmospheric vent hole 20b, a flow passage 20c, and a through hole 20d.

[0027] The internal space 20a is formed in the upper part of the valve housing 20. The boss 14 attached to the lower part of the stator 11 is housed in this internal space 20a. Therefore, the lower end of the motor shaft 15 supported by the boss 14 can be pushed out into the internal space 20a.

[0028] The atmosphere vent hole 20b is formed in a side wall that defines the internal space 20a. This atmosphere vent hole 20b communicates between the internal space 20a and the outside of the valve housing 20. Therefore, the internal space 20a is filled with the atmosphere.

[0029] The flow passage 20c forms a part of the EGR passage. The EGR gas, which is a fluid, flows through the flow passage 20c. Arrow G in Fig. 1 indicates the flow of the EGR gas.

[0030] The through hole 20d is formed penetrating the valve housing 20 in the up-down direction. The upper end of the through hole 20d is open to the internal space 20a. The lower end of the through hole 20d is open to the flow path 20c. A valve shaft 23, which will be described later, is slidably supported in the through hole 20d.

[0031] The valve housing 20 includes a valve seat 21, a valve 22, a valve shaft 23, a bearing 24, a holder 25, and a spring 26.

[0032] The valve seat 21 is provided in the flow passage 20c. The valve seat 21 is formed in an annular shape.

[0033] The valve 22 is formed in a circular shape. The valve 22 is detachable from the valve seat 21 in the flow passage 20c. The EGR valve device adjusts the opening of the valve 22 with respect to the valve seat 21 to control the flow rate of the EGR gas flowing through the flow passage 20c.

[0034] The valve shaft 23 is supported by a bearing 24. Therefore, the valve shaft 23 is capable of reciprocating movement in the axial direction of the valve shaft 23. Furthermore, the upper end of the valve shaft 23 is capable of abutting against the lower end of the motor shaft 15. The valve 22 is attached to the lower end of the valve shaft 23. As a result, the valve 22 is seated on the valve seat 21 when the valve shaft 23 moves upward in the axial direction. Furthermore, the valve 22 is released from the valve seat 21 when the valve shaft 23 moves downward in the axial direction.

[0035] The holder 25 is formed in a circular shape. The holder 25 is disposed in the internal space 20a. The holder 25 is fixed to the outer peripheral surface of the upper end side of the valve shaft 23. The spring 26 is disposed in the internal space 20a. The spring 26 is provided in a compressed state between the holder 25 attached to the valve shaft 23 and the bottom surface of the internal space 20a. Therefore, the spring 26 biases the valve shaft 23 upward via the holder 25. That is, the valve 22 is always biased in the valve closing direction.

[0036] Therefore, when driving power is supplied to the motor 10, the motor shaft 15 moves downward as it is pushed from the axial inner side to the axial outer side of the rotor shaft 12a in accordance with the forward or reverse rotation of the rotor 12. Then, the lower end of the motor shaft 15 that moves downward presses the upper end of the valve shaft 23. Therefore, the motor shaft 15 moves downward against the biasing force of the spring 26. Accordingly, the valve 22 leaves the valve seat 21 and opens the flow path 20c. As a result, the EGR gas flows back from the exhaust passage to the intake passage. At this time, the flow rate of the EGR gas is controlled according to the valve opening degree of the valve 22 relative to the valve seat 21.

[0037] Furthermore, when driving power is supplied to the motor 10, the motor shaft 15 moves upward as it is drawn from the axially outer side to the axially inner side of the rotor shaft 12a as the rotor 12 rotates forward or backward. Then, the lower end of the motor shaft 15 that moves upward moves away from the upper end of the valve shaft 23. Therefore, the valve shaft 23 moves upward by the biasing force of the spring 26. Accordingly, the valve 22 seats on the valve seat 21 and closes the flow path 20c. As a result, the exhaust passage and the intake passage are blocked by the valve 22, and the EGR gas does not flow back from the exhaust passage to the intake passage.

[0038] 1 and 2, the seal member 16 prevents foreign matter C1, C2 from entering the inside of the motor 10 by suppressing the intrusion of foreign matter between the rotor shaft 12a and the boss 14. The seal member 16 is provided inside the boss 14. The seal member 16 is formed in an annular shape and provided radially outside the rotor shaft 12a. The seal member 16 is formed of a resin material such as a fluororesin.

[0039] As shown in FIGS. 1 to 5, the seal member 16 has a large cylindrical portion 16a, a small cylindrical portion 16b, a middle cylindrical portion 16c, a recess 16d, and a ventilation hole 16e.

[0040] The large cylindrical portion 16a constitutes the lower portion of the seal member 16. The outer diameter of the large cylindrical portion 16a is the largest among all the portions of the seal member 16. The large cylindrical portion 16a is fitted into the fitting recess 14b. Specifically, the inner peripheral end of the large cylindrical portion 16a abuts against the inner peripheral surface of the fitting recess 14b. The outer peripheral end of the large cylindrical portion 16a abuts against the outer peripheral surface of the fitting recess 14b. Therefore, the large cylindrical portion 16a can suppress the intrusion of foreign matter between the large cylindrical portion 16a and the inner surface of the boss 14.

[0041] The small cylindrical portion 16b constitutes the upper portion of the seal member 16. The outer diameter of the small cylindrical portion 16b is smaller than the outer diameter of the large cylindrical portion 16a. The inner diameter of the small cylindrical portion 16b is the smallest among the portions of the seal member 16. The inner peripheral end of the small cylindrical portion 16b can abut against the outer peripheral surface of the rotating rotor shaft 12a. Therefore, the small cylindrical portion 16b can prevent foreign matter from entering between the small cylindrical portion 16b and the rotor shaft 12a.

[0042] The intermediate cylindrical portion 16c is disposed between the large cylindrical portion 16a and the small cylindrical portion 16b in the axial direction of the seal member 16. The outer diameter of the intermediate cylindrical portion 16c is approximately the same as the outer diameter of the small cylindrical portion 16b. The inner diameter of the intermediate cylindrical portion 16c is approximately the same as the inner diameter of the large cylindrical portion 16a. The intermediate cylindrical portion 16c is provided with a recess 16d and a plurality of breathing holes 16e.

[0043] The recess 16d is formed in an annular shape on the outer peripheral surface of the intermediate cylindrical portion 16c. That is, the recess 16d is formed on the entire outer peripheral surface in the circumferential direction of the intermediate cylindrical portion 16c. The waterproof and moisture-permeable member 17 is attached to the recess 16d, and a pressing ring 18 can be fitted therein. The details will be described later.

[0044] The ventilation holes 16e are holes that penetrate the intermediate cylindrical portion 16c in the radial direction. The ventilation holes 16e are arranged at equal intervals in the circumferential direction of the seal member 16. In this case, the outer ends of the ventilation holes 16e open to the surface of the recess 16d. Therefore, the ventilation holes 16e can communicate between the inside and the outside of the motor 10. As a result, the seal member 16 can suppress the intrusion of foreign matter from between the rotor shaft 12a and the boss 14, while suppressing air pressure fluctuations inside the motor 10 that correspond to the linear motion of the motor shaft 15.

[0045] As shown in FIG. 2, the waterproof moisture permeable member 17 is provided in the recess 16d so as to cover all the breathing holes 16e. The waterproof moisture permeable member 17 is formed, for example, in a sheet shape. In this case, the waterproof moisture permeable member 17 may be provided around the entire circumference of the recess 16d so as to cover all the breathing holes 16e. The waterproof moisture permeable member 17 may be divided and provided around the entire circumference of the recess 16d so as to correspond to two or more breathing holes 16e among all the breathing holes 16e. Furthermore, the waterproof moisture permeable member 17 may be divided and provided around the entire circumference of the recess 16d so as to correspond to each breathing hole 16e. The waterproof moisture permeable member 17 may be attached to the recess 16d using an adhesive or thermal welding. This improves the adhesion between the seal member 16 and the waterproof moisture permeable member 17.

[0046] Such a waterproof and moisture-permeable member 17 is formed from a waterproof and moisture-permeable material having waterproofness and moisture permeability. The waterproof and moisture-permeable material is a material that does not let water through but allows moisture (water vapor) to pass through, and has a structure with small holes that allow water vapor to pass through but not water. This waterproof and moisture-permeable material is, for example, polyurethane. Therefore, even if the breathing hole 16e is covered with the waterproof and moisture-permeable member 17, water, dust, dirt, etc. cannot pass through the breathing hole 16e, but air (atmospheric pressure) can pass through the breathing hole 16e.

[0047] 2, 3, and 6, the pressing ring 18 is provided on the radially outer side of the seal member 16. The pressing ring 18 is formed in an annular shape. The pressing ring 18 is made of a resin such as silicone rubber or fluororubber. The pressing ring 18 is an elastic O-ring or C-ring.

[0048] The inner peripheral end of the pressing ring 18 can be fitted into the recess 16d of the sealing member 16. Therefore, the inner peripheral end of the pressing ring 18 can press the waterproof, moisture-permeable member 17 into the recess 16d. Therefore, the pressing ring 18 can prevent the waterproof, moisture-permeable member 17 from falling off from the sealing member 16 and the waterproof, moisture-permeable member 17 from shifting in position with respect to the breathing hole 16e.

[0049] On the other hand, the outer peripheral end of the pressure ring 18 abuts against the inner surface of the boss 14. Therefore, the pressure ring 18 can press the seal member 16 against the outer peripheral surface of the rotor shaft 12a. As a result, the pressure ring 18 can improve the prevention of foreign matter from entering between the outer peripheral surface of the rotor shaft 12a and the inner peripheral end of the seal member 16.

[0050] The pressing ring 18 has a recess 18a and a protrusion 18b. The recess 18a and the protrusion 18b are formed on the upper and lower surfaces of the pressing ring 18 so as to extend in the radial direction. The recess 18a and the protrusion 18b are alternately arranged in the circumferential direction on the upper and lower surfaces of the pressing ring 18. At this time, the recess 18a is arranged so as to face the breathing hole 16e of the seal member 16. Therefore, a portion of the breathing hole 16e faces the recess 18a and is not blocked by the pressing ring 18.

[0051] That is, when the waterproof moisture-permeable member 17 is pressed against the recess 16d by the pressing ring 18, if the entire outer end of the breathing hole 16e is blocked by the pressing ring 18, air attempting to pass through the breathing hole 16e may be stagnated. Therefore, the pressing ring 18 is arranged so that the recess 18a corresponds to the breathing hole 16e, thereby opening a part of the outer end of the breathing hole 16e. Therefore, the pressing ring 18 can improve the passage of air through the breathing hole 16e.

[0052] Here, the length, width, and height of the motor 10 are approximately 60 mm, approximately 60 mm, and approximately 80 mm, and the volume is approximately 288,000 mm. 3 In this case, for example, the total opening area of ​​the ventilation holes 16e that are not blocked by the pressing ring 18 is 1.5 mm 2 That's all.

[0053] As shown in Fig. 1, in the EGR valve device, a foreign object C1 from the flow passage 20c may enter the inside of the motor 10 through the internal space 20a of the valve housing 20 from between the through hole 20d and the outer circumferential surface of the valve shaft 23. Also, as shown in Fig. 1, a foreign object C2 from the atmosphere vent hole 20b may enter the inside of the motor 10 through the internal space 20a of the valve housing 20. The foreign object C1 is, for example, condensed water, exhaust gas, and deposits. The foreign object C2 is, for example, water, dust, and dirt. In this case, the foreign objects C1 and C2 attempt to enter the inside of the motor 10 through the inside of the boss 14.

[0054] In contrast, as shown in FIG. 2, the EGR valve device is provided with a seal member 16 between the outer peripheral surface of the rotor shaft 12a and the inner surface of the boss 14, thereby preventing the intrusion of foreign objects C1, C2 into the interior of the motor 10.

[0055] The EGR valve device also controls the flow rate of EGR gas by adjusting the opening of the valve 22. At this time, the motor 10 reciprocates the motor shaft 15 in the axial direction, and the air pressure inside the motor 10 fluctuates accordingly.

[0056] In contrast, the EGR valve device has a breathing hole 16e provided in the seal member 16, so that the air pressure inside the motor 10 can be let in and out through the breathing hole 16e. Therefore, the EGR valve device can suppress the influence of air pressure fluctuations inside the motor 10 on the motor 10. At this time, as shown in Fig. 2, the waterproof and moisture-permeable member 17 covers the breathing hole 16e, so the EGR valve device can prevent the foreign objects C1 and C2 from entering the inside of the motor 10 through the breathing hole 16e.

[0057] As described above, the motor 10 according to the first embodiment includes the rotor shaft 12a rotatably supported inside the stator 11, the motor shaft 15 supported inside the rotor shaft 12a and reciprocating in the axial direction with the rotation of the rotor shaft 12a, the boss 14 provided on the stator 11 and penetrating the motor shaft 15 to regulate the rotation of the motor shaft 15, the annular seal member 16 provided inside the boss 14 and having an inner circumferential end abutting the outer circumferential surface of the rotor shaft 12a, the breathing hole 16e penetrating the seal member 16 in the radial direction, the waterproof moisture permeable member 17 provided on the outer circumferential surface of the seal member 16 so as to cover the breathing hole 16e, and the pressing ring 18 provided on the radial outside of the seal member 16 and pressing the waterproof moisture permeable member 17 against the outer circumferential surface of the seal member 16. Therefore, the motor 10 can suppress the air pressure fluctuation inside the motor while preventing the intrusion of the foreign objects C1 and C2 into the motor without changing the shape of the exterior parts.

[0058] The motor 10 is provided on the outer circumferential surface of the seal member 16 and has a recess 16d into which the outer end of the breathing hole 16e opens. The waterproof and moisture-permeable member 17 is provided in the recess 16d. The inner circumferential end of the pressing ring 18 fits into the recess 16d via the waterproof and moisture-permeable member 17. Therefore, the motor 10 can prevent the waterproof and moisture-permeable member 17 from falling off the seal member 16 and the waterproof and moisture-permeable member 17 from shifting in position with respect to the breathing hole 16e.

[0059] In the motor 10, the outer peripheral end of the retaining ring 18 abuts against the inner surface of the boss 14. Therefore, in the motor 10, the seal member 16 can be pressed against the outer peripheral surface of the rotor shaft 12a by the retaining ring 18. As a result, the motor 10 can improve the prevention of intrusion of foreign matter between the outer peripheral surface of the rotor shaft 12a and the inner peripheral end of the seal member 16.

[0060] In the motor 10, the pressing ring 18 has recesses 18a on the upper and lower surfaces thereof that extend in the radial direction of the pressing ring. The recesses 18a are disposed in correspondence with the breathing holes 16e. This allows the motor 10 to facilitate the passage of air through the breathing holes 16e, and thus makes it easy to suppress air pressure fluctuations inside the motor.

[0061] In the motor 10, the seal member 16 has a large cylindrical portion 16a that is fitted into the boss 14, a small cylindrical portion 16b whose inner circumferential end abuts the outer circumferential surface of the rotor shaft 12a, and an intermediate cylindrical portion 16c that is provided between the large cylindrical portion 16a and the small cylindrical portion 16b and in which a ventilation hole 16e is formed. Therefore, the seal member 16 has a simple structure and is capable of preventing the intrusion of foreign matter and providing air permeability.

[0062] In the motor 10, a plurality of breathing holes 16e are provided in the circumferential direction of the seal member 16. Therefore, in the motor 10, the seal member 16 can be assembled at any rotation angle. As a result, the motor 10 can improve the ease of assembly of the seal member 16.

[0063] In the motor 10, the waterproof and moisture-permeable member 17 is formed in a sheet shape. Therefore, in the motor 10, the waterproof and moisture-permeable member 17 can be easily assembled to the outer peripheral surface of the seal member 16. As a result, the motor 10 can improve the ease of assembly of the waterproof and moisture-permeable member 17.

[0064] The valve device includes a motor 10, a valve housing 20 fixed to a stator 11, a flow path 20c formed in the valve housing 20, a valve seat 21 provided in the flow path 20c, a valve 22 provided detachably with respect to the valve seat 21, and a valve shaft 23 having the valve 22 at one end and moving in conjunction with the axial movement of the motor shaft 15. Therefore, the valve device can suppress air pressure fluctuations inside the motor while preventing foreign objects C1, C2 from entering the motor, without changing the shape of the exterior components of the motor 10.

[0065] It should be noted that, within the scope of the present disclosure, any of the components of the embodiments may be modified or any of the components of the embodiments may be omitted. [Industrial Applicability]

[0066] The motor of the present disclosure is suitable for use in motors, etc., because by pressing the waterproof, moisture-permeable member covering the breathing hole of the sealing member with the pressing ring 18, it is possible to prevent foreign matter from entering the motor while suppressing air pressure fluctuations inside the motor. [Explanation of symbols]

[0067] 10 motor, 11 stator, 12 rotor, 12a rotor shaft, 13 bearing, 14 boss, 14a support hole, 14b fitting recess, 15 motor shaft, 15a rotation restricting portion, 16 seal member, 16a large cylindrical portion, 16b small cylindrical portion, 16c intermediate cylindrical portion, 16d recess, 16e breathing hole, 17 waterproof moisture permeable member, 18 holding ring, 18a recess, 18b protrusion, 20 valve housing, 20a internal space, 20b atmospheric vent hole, 20c flow path, 20d through hole, 21 valve seat, 22 valve, 23 valve shaft, 24 bearing, 25 holder, 26 spring.

Claims

1. A rotor shaft rotatably supported inside the stator; a motor shaft supported inside the rotor shaft and reciprocating in an axial direction as the rotor shaft rotates; a cylindrical boss having an upper end attached to a lower portion of the stator and a lower end through which a lower end of the motor shaft passes to regulate rotation of the motor shaft; a ring-shaped seal member that is fitted onto the inner surface of the boss and has an inner peripheral end that abuts against an outer peripheral surface of the rotor shaft; A ventilation hole that radially penetrates the seal member; A waterproof and moisture-permeable member provided on the outer peripheral surface of the sealing member so as to cover the breathing hole; a pressing ring provided radially outside the sealing member and pressing the waterproof / moisture-permeable member against an outer circumferential surface of the sealing member. A motor characterized by:

2. a recess provided on an outer circumferential surface of the seal member and into which an outer end of the ventilation hole opens; The waterproof and moisture-permeable member is provided in the recess, The inner peripheral end of the pressing ring is fitted into the recess via the waterproof and moisture permeable member.

2. The motor according to claim 1.

3. The outer circumferential edge of the retainer ring abuts against the inner surface of the boss.

3. The motor according to claim 2.

4. The presser ring has recesses on its upper and lower surfaces extending in a radial direction of the presser ring, The recess is disposed corresponding to the ventilation hole.

2. The motor according to claim 1.

5. The sealing member is A large cylindrical portion that is fitted into the boss; a small cylindrical portion whose inner circumferential end abuts against an outer circumferential surface of the rotor shaft; An intermediate cylindrical portion is provided between the large cylindrical portion and the small cylindrical portion, and the breathing hole is formed in the intermediate cylindrical portion.

2. The motor according to claim 1.

6. The breathing hole is provided in a plurality of holes in the circumferential direction of the seal member.

2. The motor according to claim 1.

7. The waterproof and moisture-permeable member is formed in a sheet shape.

2. The motor according to claim 1.

8. A motor according to any one of claims 1 to 7; a valve housing fixed to the stator; A flow passage formed in the valve housing; A valve seat provided in the flow path; a valve detachably provided on the valve seat; a valve shaft having the valve at one end and adapted to move in the axial direction of the motor shaft; A valve device comprising:

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