Normally open solenoid valve for automobile multi-cavity air spring

Abstract

The utility model discloses a normally open solenoid valve for an automobile multi-cavity air spring, which comprises a shell, a framework arranged in the shell, an enameled wire wound on the outer side of the framework, a magnetism isolating tube arranged in an inner hole in the middle of the framework, a movable iron core arranged in the magnetism isolating tube, and a cushion block assembly arranged between the magnetism isolating tube and the end part of the movable iron core, an electrical interface is installed at the end of the shell, a valve seat is installed at the second axial end of the shell, a base is installed between the valve seat and the framework, an ejector rod piece capable of moving axially is arranged at the position, corresponding to the valve port, between the base and the valve seat, the first end of the ejector rod piece penetrates through the base to abut against the movable iron core, and a connecting socket is arranged at the end of the framework. The connecting socket is connected with a PIN needle in the electrical interface, a limiting claw is arranged at the side end of the PIN needle, and after the limiting claw is bent, the enameled wire is pressed and fixed on the PIN needle and is subjected to spot welding. The electromagnetic valve can solve the problems that an electric power connection structure of an existing electromagnetic valve is complex, and power connection is not reliable.

Description

Technical Field

[0001] The utility model relates to the technical field of automotive air springs, in particular to a normally open solenoid valve for an automotive multi-chamber air spring. Background Art

[0002] The solenoid valve is one of the essential components of automotive products, and its main function is to realize the on-off function of pipelines. Due to the increasing market demand for solenoid valves of automotive multi-chamber air springs, but the current price of this product is relatively high, it is very difficult to balance the internal and external air pressures of the solenoid valve. During use, due to the excessive air pressure difference, there is a risk that the solenoid valve will be pushed open. The existing electrical connection structure of the solenoid valve is complex, cannot be installed quickly, and the electrical connection is unreliable. The moving iron core is unreliable in controlling the sealing and opening of the valve port, and the overall cost is relatively high. Content of the Utility Model

[0003] The utility model provides a normally open solenoid valve for an automotive multi-chamber air spring, which has a novel and firm structure and is convenient to assemble, and solves the problems of the complex electrical connection structure and unreliable electrical connection of the existing solenoid valve.

[0004] To achieve the above object, the utility model provides the following technical solution: A normally open solenoid valve for an automotive multi-chamber air spring, comprising: a housing, a skeleton is installed inside the housing, an enameled wire is wound around the outside of the skeleton, a magnetic isolation tube is installed in the inner hole in the middle of the skeleton, a movable iron core in the axial direction is arranged inside the magnetic isolation tube, a cushion assembly for reducing noise is arranged between the inside of the magnetic isolation tube and the end of the movable iron core, an electrical interface connected to the skeleton is installed at the first axial end of the housing, a valve seat is installed at the second axial end of the housing, a base is installed between the valve seat and the skeleton, a valve port is arranged on the valve seat, an axially movable push rod is arranged at a position corresponding to the valve port between the base and the valve seat, the first end of the push rod passes through the base and abuts against the movable iron core, an elastic member is arranged at the second end of the push rod, at least one connection socket is arranged at the end of the skeleton, the connection socket is connected to the bottom end of the PIN pin inside the electrical interface, a limiting claw is arranged on the side end of the PIN pin, and after the limiting claw is bent, the enameled wire is pressed and fixed on the PIN pin and spot welded. The push rod is used as the valve core, and the base can guide the movement of the push rod, while shortening the length of the movable iron core, making the structure of the whole solenoid valve more compact and reliable. By adopting a new PIN pin structure, a firm and reliable connection between the enameled wire and the PIN pin can be realized, and the problem of unreliable current connection is solved.

[0005] Preferably, a ramp groove is provided on one side of the connection socket, and the enameled wire is cut along the ramp groove and wound around the outside of the skeleton. The ramp groove can protect and position the enameled wire, further improving the firmness of the connection between the enameled wire and the PIN pin.

[0006] Preferably, the pad assembly includes an annular pad and a rubber pad. The rubber pad is arranged on the axial two end faces of the annular pad. A groove is provided on the radial outer side of the annular pad. An inner concave portion is provided on the side wall of the magnetic isolation tube corresponding to the groove. The inner concave portion is embedded into the groove of the annular pad to fix the pad assembly on the top of the magnetic isolation tube. The annular pad can position the rubber pad, while improving the compressive resistance of the entire pad assembly. Moreover, the structure of the magnetic isolation tube can be used to fix the pad assembly without welding, reducing the process difficulty and making the installation of the pad assembly more firm and reliable.

[0007] Preferably, the top rod member includes a sleeve base and a top rod portion axially arranged on the top of the sleeve base. A plurality of through holes are provided on the top of the sleeve base. The elastic member is arranged inside the sleeve base. The inside of the sleeve base can position the elastic member, and the through holes can connect the internal space of the magnetic isolation tube with the outside to eliminate the air pressure difference, thereby avoiding the risk that the solenoid valve is pushed open due to too large air pressure difference.

[0008] Preferably, a sliding bearing is arranged between the base and the top rod member. A first sealing ring that forms a seal with the top rod member is arranged in the inner hole of the base. A retaining ring and a retaining block are respectively arranged on the two axial sides of the first sealing ring. The sliding bearing can guide the movement of the top rod member and reduce the friction force, making the movement of the top rod member smoother. The retaining ring and the retaining block can axially position and protect the first sealing ring, improving the sealing effect.

[0009] Preferably, the inner side wall of the valve seat located above the valve port is a conical side wall. A second sealing ring for forming a seal with the conical side wall is further arranged at the second end of the top rod member. A better sealing effect can be achieved through the conical side wall and the second sealing ring. During the movement of the top rod member, the second sealing ring will be squeezed to improve the sealing effect.

[0010] Preferably, at least one ventilation cut groove is axially arranged on the outer side wall of the moving iron core, which can realize the ventilation at both ends of the moving iron core.

[0011] Preferably, a cover plate is arranged between the skeleton and the electrical interface. A circular groove is arranged at the lower end of the cover plate. The end of the magnetic isolation tube extends into the circular groove for positioning, which can ensure the relative positioning and firm connection between the skeleton and the electrical interface.

[0012] Preferably, a plastic cover is installed at the axial first end of the shell, a circle of sloped undercuts is provided on the radial inner side of the plastic cover, and an outer groove that is interlocked with the sloped undercuts is provided on the outer side wall of the electrical interface, so that the electrical interface can be installed firmly and quickly, making the assembly process simpler.

[0013] Preferably, a tail fin is provided around the circumference of the second axial end of the shell, and the tail fin limits the valve seat at the second axial end of the shell, eliminating the need for welding, reducing the process difficulty, and making the installation of the valve seat more firm and reliable.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] A push rod is used as the valve core, and the base can guide the movement of the push rod. At the same time, the length of the moving iron core is shortened, making the structure of the entire solenoid valve more compact and reliable. A new PIN needle structure can achieve a firm and reliable connection between the enameled wire and the PIN needle, solving the current problem of unreliable power connection; through holes and ventilation grooves are respectively provided on the push rod and the moving iron core to connect the internal space of the magnetic isolation tube with the outside, eliminating the air pressure difference, thereby avoiding the risk of the solenoid valve being pushed open due to excessive air pressure difference; a new noise reduction buffer block structure is adopted, which does not require welding, reduces the process difficulty, makes the installation of the block more firm and reliable, and the overall structure is novel, firm and easy to assemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a main cross-sectional structural diagram of the utility model;

[0017] Figure 2 It is a side sectional structural diagram of the utility model;

[0018] Figure 3 It is a three-dimensional structural diagram of the top rod of the utility model;

[0019] Figure 4 It is a three-dimensional structural diagram of the moving iron core of the utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the appearance of the utility model;

[0021] Figure 6 It is a three-dimensional structural diagram of the base of the utility model;

[0022] Figure 7 It is a three-dimensional structural diagram of the cushion block assembly of the utility model;

[0023] Figure 8 This is a three-dimensional structural diagram of the PIN needle of the utility model;

[0024] Figure 9It is a three-dimensional structural diagram of the framework of the utility model;

[0025] Figure 10 It is a three-dimensional structural diagram of the plastic cover of the utility model.

[0026] Reference numerals:

[0027] 1. Electrical interface, 2. Plastic cover, 201. Slope buckle, 3. Shell, 301. Tail fin, 4. Cover, 5. Frame, 501. Slope groove, 502. Connecting socket, 6. Moving iron core, 601. Ventilation groove, 7. Base, 701. First matching groove, 702. Second matching groove, 703. Third matching groove, 8. Elastic part, 9. Magnetic isolation tube, 10. Enameled wire, 11. Top rod, 1102. Through hole, 11 03. Push rod part, 1104. Pipe sleeve base, 12. Valve seat, 1201. Valve port, 13. Second sealing ring, 14. PIN needle, 1401. Limit claw, 15. Gasket assembly, 1501. Rubber pad, 1502. Ring gasket, 16. Fifth sealing ring, 17. Sixth sealing ring, 18. Third sealing ring, 19. Sliding bearing, 20. First sealing ring, 21. Retaining ring, 22. Stopper, 23. Fourth sealing ring. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0029] The utility model aims to solve the problems of complicated electrical connection structure and unreliable electrical connection of the existing solenoid valve. Figures 1-10As shown in the figure, the following technical solution is provided: A normally open solenoid valve for a multi-chamber air spring of an automobile, comprising: a housing 3, a skeleton 5 is installed inside the housing 3, an enameled wire 10 is wound around the outside of the skeleton 5, a magnetic isolation tube 9 is installed in the inner hole in the middle of the skeleton 5, and a movable iron core 6 that can move axially is arranged inside the magnetic isolation tube 9. It is characterized in that a noise-reducing pad assembly 15 is arranged between the inside of the magnetic isolation tube 9 and the end of the movable iron core 6. An electrical interface 1 connected to the skeleton 5 is installed at the first axial end of the housing 3, a valve seat 12 is installed at the second axial end of the housing 3, a base 7 is installed between the valve seat 12 and the skeleton 5, a valve port 1201 is arranged on the valve seat 12, and an axially movable top rod member 11 is arranged at a position corresponding to the valve port 1201 between the base 7 and the valve seat 12. The first end of the top rod member 11 passes through the base 7 and abuts against the movable iron core 6, and an elastic member 8 is arranged at the second end of the top rod member 11. At least one connection socket 502 is arranged at the end of the skeleton 5, and the connection socket 502 is connected to the bottom end of a PIN pin 14 inside the electrical interface 1. A limiting claw 1401 is arranged on the side of the PIN pin 14. After the limiting claw 1401 is bent, the enameled wire 10 is pressed and fixed on the PIN pin 14 and spot welded. Using the top rod member as the valve core, the base can guide the movement of the top rod member, and at the same time, the length of the movable iron core is shortened, making the structure of the entire solenoid valve more compact and reliable. Using the new structure of the PIN pin 14, a firm and reliable connection between the enameled wire 10 and the PIN pin 14 can be achieved, solving the problem of unreliable power connection at present.

[0030] Specifically, a groove is dug on the outer circle of the base 7 to place the third sealing ring 18 to ensure the sealing performance outside the base 7. The electrical interface 1, the skeleton 5 and the cover plate 4 are integrally injection molded, preferably made of high-strength nylon material. Two PIN pins 14 are embedded in it, and the tail is flat. The PIN pin 14 adopts a new structure. After the limiting claw 1401 is bent, the enameled wire 10 can be pressed and fixed. Welding is carried out in the gap formed after the limiting claw 1401 is bent. The welding joint strength is large. The connection socket 502 extends upward, and the enameled wire 10 can also extend upward along the connection socket 502 to be connected to the PIN pin 14, improving the connection strength.

[0031] In this embodiment, the skeleton 5 is preferably made of high-strength nylon, and multiple layers of enameled wire 10 are wound around its outside, which is the power source for the electromagnetic force required to drive the movement of the movable iron core. A ramp groove 501 is arranged on one side of the connection socket 502, and the enameled wire 10 is cut into the ramp groove 501 and wound around the outside of the skeleton 5. The ramp groove 501 can protect and limit the enameled wire 10, and can prevent the enameled wire 10 from breaking, further improving the firmness of the connection between the enameled wire 10 and the PIN pin 14.

[0032] The housing 3 is preferably made of ferrite material with high magnetic permeability, which can improve the response time of the solenoid valve. A tail fin 301 is provided at the second axial end of the housing 3. After the tail fin 301 is bent inward, the valve seat 12 is limited at the second axial end of the housing 3. Welding is not required, which reduces the process difficulty and makes the installation of the valve seat 12 more firm and reliable. The first axial end of the housing 3 is in the shape of a stepped cylinder, and a fifth sealing ring 16 is installed at the small outer circle to isolate external air from entering the inner cavity of the air spring.

[0033] In this embodiment, the moving iron core 6 and the inner hole of the magnetic isolation tube 9 have a small clearance fit. Under the premise of ensuring the smooth axial movement of the moving iron core 6, the perpendicularity of its movement can also be ensured. The head of the moving iron core 6 is designed with a cylindrical groove, which can be used as a support during the later surface treatment to avoid damaging the outer surface coating. The coating is preferably a Teflon coating, which is smooth and wear-resistant, making the movement of the moving iron core 6 smoother. The bottom of the moving iron core 6 is designed with a conical groove, which is in imitation match with the base 7. The electromagnetic force of this structure can be improved a lot, greatly improving the performance of the solenoid valve. At the same time, in order to make the whole valve interior filled with gas, as Figure 4 shown, at least one ventilation cut groove 601 is axially provided on the outer side wall of the moving iron core 6. The existence of the cut groove enables the moving iron core 6 not to be airtight due to axial movement, and the gas can quickly pass through its surroundings.

[0034] In this embodiment, as a specific embodiment of the spacer assembly 15, as Figure 7 shown, the spacer assembly 15 includes an annular spacer 1502 and a rubber pad 1501. The rubber pad 1501 is arranged on the axial two end faces of the annular spacer 1502. Specifically, the annular spacer 1502 and the rubber pad 1501 are integrally injection-molded together with a relatively large bonding strength. A groove is provided on the radial outer side of the annular spacer 1502, and an inner concave portion is provided on the side wall of the magnetic isolation tube 9 corresponding to the groove. The inner concave portion can be formed by a three-and-a-half punching process outside the magnetic isolation tube 9. The inner concave portion is embedded into the groove of the annular spacer 1502 to fix the spacer assembly 15 on the top of the magnetic isolation tube 9. The annular spacer 1502 can limit the rubber pad 1501, and at the same time improve the compressive resistance of the whole spacer assembly 15. Moreover, the structure of the magnetic isolation tube 9 can be used to fix the spacer assembly 15 without welding, reducing the process difficulty and making the installation of the spacer assembly more firm and reliable.

[0035] When the solenoid valve is powered off, the moving iron core 6 does not directly touch the magnetic isolation tube 9 when resetting, but touches the rubber pad 1501 of the spacer assembly 15, thereby reducing noise. And after the spacer assembly 15 has gone through durability, the end face of the rubber pad 1501 can still be higher than the end face of the spacer 1502, always keeping the moving iron core 6 not in direct contact with the magnetic isolation tube 9.

[0036] As a specific structure of the push rod 11, asFigure 3 As shown, the top rod member 11 includes a sleeve base 1104 and a top rod portion 1103 axially disposed on the top of the sleeve base 1104. A plurality of through holes 1102 are provided on the top of the sleeve base 1104. The elastic member 8 is disposed inside the sleeve base 1104. The elastic member 8 is disposed inside the sleeve base 1103. The inside of the sleeve base can limit the elastic member, and the through holes can connect the internal space of the magnetic isolation tube with the outside to eliminate the air pressure difference, thereby avoiding the risk that the solenoid valve is pushed open due to excessive air pressure difference.

[0037] In this embodiment, in order to ensure the smoothness and sealing performance between the base 7 and the top rod member 11, a sliding bearing 19 is provided between the base 7 and the top rod member 11. A first sealing ring 20 for forming a seal with the top rod member 11 is provided in the inner hole of the base 7. A retaining ring 21 and a retaining block 22 are respectively provided on both axial sides of the first sealing ring 20. The sliding bearing 19 can guide the movement of the top rod member 11 and reduce the friction force, making the movement of the top rod member 11 smoother. The retaining ring 21 and the retaining block 22 can axially limit and protect the first sealing ring 20, improving the sealing effect. A mating groove is provided on the inner wall of the inner hole of the base 7. The sliding bearing 19 is installed in the first mating groove 701, the first sealing ring 20 and the retaining ring 21 are installed in the second mating groove 702, and the retaining block 22 is installed in the third mating groove 703. A fourth sealing ring 23 is placed in the outer groove of the valve seat 12, and a fifth sealing ring 16 is installed between the housing 3 and the electrical interface 1. At the same time, a sixth sealing ring 17 is installed on the outer circle of the housing 3.

[0038] The inside of the sleeve base 1104 can limit the elastic member 8, and the through holes 1102 can connect the internal space of the magnetic isolation tube 9 with the outside to eliminate the air pressure difference, thereby avoiding the risk that the solenoid valve is pushed open due to excessive air pressure difference. The top rod portion 1103 of the top rod member 11 is cross-shaped, and this design allows the gas around the top rod portion 1103 to freely pass through.

[0039] A support column is designed in the center of the valve seat 12 and has a clearance fit with the inner hole of the top rod member 11, enabling the top rod member 11 to move smoothly up and down. At the same time, this support column provides a supporting plane for the elastic member 8 to ensure that the elastic member 8 can expand and contract within the stroke range.

[0040] In order to improve the sealing performance of the opening and sealing of the valve port 1201, the inner side wall of the valve seat 12 located above the valve port 1201 is a tapered side wall. A second sealing ring 13 for forming a seal with the tapered side wall is further provided at the second end of the top rod member 11. A better sealing effect can be achieved through the tapered side wall and the second sealing ring 13. During the movement of the top rod member 11, the second sealing ring 13 will be compressed to improve the sealing effect.

[0041] In this embodiment, if Figures 1-2 As shown, a cover plate 4 is arranged between the skeleton 5 and the electrical interface 1, a circular groove is arranged at the lower end of the cover plate 4, the end of the magnetic isolation tube 9 extends into the circular groove for limiting, and the electrical interface 1 is integrally injection-molded with the skeleton 5 and the cover plate 4, which can ensure the relative limiting and firm connection between the skeleton and the electrical interface.

[0042] like Figure 10 As shown, a plastic cover 2 is installed at the axial first end of the shell 3, a circle of sloped undercuts 201 is arranged on the radial inner side of the plastic cover 2, and an outer groove which is interlocked with the sloped undercuts 201 is arranged on the outer side wall of the electrical interface 1, so that the electrical interface can be installed firmly and quickly, making the assembly process simpler.

[0043] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0044] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A normally open solenoid valve for a multi-chamber air spring of an automobile, comprising: A housing (3), a skeleton (5) is installed inside the housing (3), an enameled wire (10) is wound around the outer side of the skeleton (5), a magnetic isolation tube (9) is installed in the inner hole in the middle of the skeleton (5), and an axially movable moving iron core (6) is arranged inside the magnetic isolation tube (9). It is characterized in that a noise-reducing cushion assembly (15) is arranged between the inside of the magnetic isolation tube (9) and the end of the moving iron core (6). An electrical interface (1) connected to the skeleton (5) is installed at the first axial end of the housing (3), a valve seat (12) is installed at the second axial end of the housing (3), a base (7) is installed between the valve seat (12) and the skeleton (5), a valve port (1201) is arranged on the valve seat (12), and an axially movable ejector rod member (11) is arranged at a position corresponding to the valve port (1201) between the base (7) and the valve seat (12). The first end of the ejector rod member (11) passes through the base (7) and abuts against the moving iron core (6), an elastic member (8) is arranged at the second end of the ejector rod member (11), at least one connection socket (502) is arranged at the end of the skeleton (5), the connection socket (502) is connected to the bottom end of a PIN pin (14) inside the electrical interface (1), a limiting claw (1401) is arranged on the side of the PIN pin (14), and after the limiting claw (1401) is bent, the enameled wire (10) is pressed and fixed on the PIN pin (14) and spot welded.

2. The normally open solenoid valve for an automotive multi-chamber air spring according to claim 1, wherein: A ramp groove (501) is arranged on one side of the connection socket (502), and the enameled wire (10) is cut along the ramp groove (501) and wound around the outer side of the skeleton (5).

3. The normally open solenoid valve for an automotive multi-chamber air spring according to claim 1, characterized in that: The cushion assembly (15) includes an annular cushion (1502) and a rubber pad (1501). The rubber pad (1501) is arranged on the axial two end faces of the annular cushion (1502). A groove is arranged on the radial outer side of the annular cushion (1502), a concave portion is arranged on the side wall of the magnetic isolation tube (9) corresponding to the groove, and the concave portion is embedded into the groove of the annular cushion (1502) to fix the cushion assembly (15) on the top of the magnetic isolation tube (9).

4. The normally open solenoid valve for the multi-chamber air spring of an automobile according to claim 1, characterized in that: The ejector rod member (11) includes a sleeve base (1104) and an ejector rod portion (1103) axially arranged on the top of the sleeve base (1104). A plurality of through holes (1102) are arranged on the top of the sleeve base (1104), and the elastic member (8) is arranged inside the sleeve base (1104).

5. The normally open solenoid valve for automotive multi-chamber air springs according to claim 1, characterized in that: A sliding bearing (19) is arranged between the base (7) and the ejector rod member (11). A first sealing ring (20) for sealing with the ejector rod member (11) is arranged in the inner hole of the base (7). A retaining ring (21) and a retaining block (22) are respectively arranged on the two axial sides of the first sealing ring (20).

6. The normally open solenoid valve for automotive multi-chamber air springs according to claim 5, characterized in that: The inner side wall of the valve seat (12) above the valve port (1201) is a conical side wall, and a second sealing ring (13) for forming a seal with the conical side wall is further arranged at the second end of the ejector rod member (11).

7. The normally open solenoid valve for an automotive multi-chamber air spring according to claim 1, characterized in that: At least one ventilation groove (601) is arranged along the axial direction on the outer side wall of the moving iron core (6).

8. The normally open solenoid valve for an automotive multi-chamber air spring according to claim 1, wherein: A cover plate (4) is provided between the frame (5) and the electrical interface (1), a circular groove is provided at the lower end of the cover plate (4), the end of the magnetic isolation tube (9) extends into the circular groove for position limiting, and the electrical interface (1) is integrally formed by injection molding with the frame (5) and the cover plate (4).

9. The normally open solenoid valve for multi-chamber air springs of an automobile according to claim 1, characterized in that: A plastic cover (2) is installed at the axial first end of the housing (3), a circle of sloped undercuts (201) is arranged on the radial inner side of the plastic cover (2), and an outer groove that is engaged with the sloped undercuts (201) is arranged on the outer side wall of the electrical interface (1).

10. The normally open solenoid valve for an automotive multi-chamber air spring according to claim 1, characterized in that: A tail fin (301) is provided around the circumference of the second axial end of the housing (3), and the tail fin (301) limits the valve seat (12) at the second axial end of the housing (3).

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