Middle VVT electromagnet structure

Abstract

The invention belongs to the technical field of engine parts, and relates to a middle VVT electromagnet structure. An inner boss (114) is arranged on the upper portion of the magnetic core body (31), a center hole (117) is formed in an inner ring of the inner boss (114), a lower lubricating bearing (2) is arranged in the center hole (117), a solid plane (115) is arranged at the bottom of the center hole (117), the inner boss (114) is contained in an inner groove (312) of the magnetic core body (31), one end, close to the magnetic core shaft (32), of the magnetic core shaft (32) is connected with the integrated front yoke sleeve (5) through the upper lubricating bearing (4), and the other end, close to the magnetic core shaft (32), of the magnetic core shaft (32) is connected with the integrated rear yoke sleeve (11) through the lower lubricating bearing (2). The centrally-mounted VVT electromagnet structure is simple, the contact area of a magnetic core body sub-assembly supporting structure is small, the friction force of relative moving parts is reduced, the magnetic core body does not make contact with other parts, abnormal abrasion caused by friction after long-time work of the magnetic core body is avoided, the service life of an electromagnet is prolonged, meanwhile, the friction force is reduced, and the service life of the electromagnet is prolonged. The hysteresis of the electromagnet is reduced, and the adjusting precision of the electromagnet is also improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of engine parts, and more particularly to a middle-mounted VVT electromagnet structure. BACKGROUND

[0002] The middle-mounted VVT electromagnet structure is a part of an automobile engine. The existing middle-mounted VVT electromagnet structure, as shown in the figure, has a large contact area of the support structure of the magnetic core body assembly, which increases the friction of the relative moving parts. The magnetic core body contacts other parts, and abnormal wear caused by friction after long-time work of the magnetic core body affects the service life of the electromagnet. At the same time, the increase of the friction force increases the hysteresis of the electromagnet, and the adjustment accuracy of the electromagnet is also affected. Figure 8

[0003] In the prior art, a technology with the name of "electromagnet" and the publication (announcement) number of "CN117128065A" is provided, which relates to an electromagnet, comprising a mounting seat, a shell is arranged on the mounting seat, an installation hole is arranged in the middle of the shell, a base is arranged in the installation hole, a top rod hole is arranged in the middle of the base, a valve core assembly is arranged in the shell, the valve core assembly is located directly below the base, the valve core assembly comprises a valve core and a top rod arranged in the valve core, the other end of the top rod passes through the top rod hole, an inner cover with an open end is arranged on the outer periphery of the valve core assembly, a ring-shaped plane is arranged at the opening of the inner cover, the ring-shaped plane is connected with the inner wall of the shell, an insert is arranged outside the inner cover, a skeleton is arranged outside the insert, a ring-shaped groove is arranged on the skeleton, an enameled coil is arranged in the ring-shaped groove, and a terminal is further arranged on the skeleton. The technology does not relate to the technical problems and technical solutions of the present application. SUMMARY

[0004] The technical problem to be solved by the present application is to provide a middle-mounted VVT electromagnet structure with simple structure, small contact area of the support structure of the magnetic core body assembly, reduced friction of the relative moving parts, no contact of the magnetic core body with other parts, avoidance of abnormal wear caused by friction after long-time work of the magnetic core body, improved service life of the electromagnet, reduced friction force, reduced hysteresis of the electromagnet, and improved adjustment accuracy of the electromagnet.

[0005] To solve the above technical problems, the technical solution adopted by the present application is as follows: ​The application discloses a middle-placed VVT electromagnet structure, which is characterized in that an outer boss and an inner boss are arranged on an integrated rear yoke sleeve, the outer boss and the inner boss form an annular groove, an outer circular sidewall and an inner groove are arranged on a magnetic core body, the outer circular sidewall of the magnetic core body is accommodated in the annular groove, a center hole is arranged in an inner ring of the inner boss, a lower lubricating bearing is arranged in the center hole, a solid flat bottom is arranged at the bottom of the center hole, the inner boss is accommodated in the inner groove of the magnetic core body, a shell center hole is arranged in the middle of the shell, an integrated front yoke sleeve is connected in the shell center hole in an interference fit, a magnetic core shaft is connected to the integrated front yoke sleeve through an upper lubricating bearing at one end, and the magnetic core shaft is connected to the integrated rear yoke sleeve through a lower lubricating bearing at the other end.

[0006] The middle-placed VVT electromagnet structure comprises a solenoid subassembly, a lower lubricating bearing, a magnetic core body subassembly, an upper lubricating bearing and an integrated front yoke sleeve.

[0007] The solenoid subassembly comprises an integrated rear yoke sleeve, a coil assembly, a shell and an injection body, and the magnetic core body subassembly, the solenoid subassembly and the integrated front yoke sleeve constitute a magnetic circuit in space.

[0008] One side end surface of the coil assembly is in contact with an outer step outer ring of the integrated rear yoke sleeve, and the other side end surface of the coil assembly is in contact with an inner hole end surface of the shell.

[0009] The upper lubricating bearing is fixed in a center hole of the integrated front yoke sleeve, the lower lubricating bearing is fixed in a center hole of the integrated rear yoke sleeve, an inner groove is arranged at the bottom of the magnetic core body, the inner groove accommodates the lower lubricating bearing and a mounting seat thereof, and a plurality of oil grooves are arranged outside a circle of the center hole.

[0010] The magnetic core body and the magnetic core shaft are fixed by riveting to constitute the magnetic core body subassembly, the magnetic core shaft penetrates through the magnetic core body, the magnetic core shaft protrudes from the magnetic core body at both ends, the magnetic core shaft is accommodated in an axial inner hole of the upper lubricating bearing and the lower lubricating bearing, and the magnetic core body is accommodated in an annular groove of the integrated rear yoke sleeve.

[0011] The magnetic core body and the integrated front yoke sleeve cancel the gasket and rely on an air gap for magnetic separation.

[0012] The shell and the bottom outer side of the integrated rear yoke sleeve are provided with a plurality of welding sections, the shell and the integrated rear yoke sleeve are fixedly connected through the welding sections, and the coil assembly is accommodated in a cavity between the shell and the integrated rear yoke sleeve.

[0013] The upper lubricating bearing and the lower lubricating bearing both adopt a coiled structure, an outer circle of the upper lubricating bearing and the lower lubricating bearing is provided with an opening, and an inner hole adopts a PTFE spraying process with low friction.

[0014] A plurality of semicircular oil grooves are arranged outside the center hole of the magnetic core body.

[0015] The technical scheme of the present application has the following working principle and advantages: The middle VVT electromagnet structure has the following advantages: the magnetic core body subassembly adopts double lubricating bearings (lower lubricating bearing and upper lubricating bearing) as a supporting structure, only the lower lubricating bearing and the upper lubricating bearing contact the magnetic core shaft of the magnetic core body subassembly, other parts of the magnetic core body subassembly do not contact the integral rear yoke sleeve and other components, thereby effectively reducing the contact area between the magnetic core body subassembly and other components, reducing the friction force of the relative moving parts, avoiding abnormal wear of the magnetic core shaft due to friction after long-time work, improving the service life of the electromagnet, and improving the adjustment accuracy of the electromagnet. Meanwhile, the integral rear yoke sleeve and the mounting seat of the lubricating bearing are designed in an integral structure, are integrally sintered by using a powder metallurgy process, and are positioned by using a high-precision tool inner hole, and are laser welded, so that the concentricity between the inner and outer circles of the integral rear yoke sleeve and the center hole of the shell is kept within 0.06 mm, and the eccentric jamming of the components after assembly is effectively prevented. BRIEF DESCRIPTION OF DRAWINGS

[0016] The content expressed by the drawings of the present specification and the marks in the drawings are briefly described as follows: Figure 1 The figure is a structural schematic diagram of the middle VVT electromagnet structure. Figure 2 The figure is a schematic diagram of the electromagnet solenoid subassembly of the middle VVT electromagnet structure. Figure 3 The figure is a structural schematic diagram of the lubricating bearing of the middle VVT electromagnet structure. Figure 4 The figure is a structural schematic diagram of the magnetic core body subassembly of the middle VVT electromagnet structure. Figure 5 The figure is a structural schematic diagram of the magnetic core body of the middle VVT electromagnet structure. Figure 6 The figure is a structural schematic diagram of the integral rear yoke sleeve of the middle VVT electromagnet structure. Figure 7 The figure is a structural schematic diagram of the solenoid welding subassembly of the middle VVT electromagnet structure. Figure 8 The figure is a structural schematic diagram of the electromagnet structure in the prior art. In the drawings, the reference numerals are respectively: 1, solenoid subassembly; 11, integral rear yoke sleeve; 112, annular groove; 113, outer boss; 114, inner boss; 115, solid flat surface; 116, oil passage; 117, 12, coil assembly; 13, housing; 14, injection molding body; 15, welding section; 2, lower lubricating bearing; 3, magnetic core body subassembly; 31, magnetic core body; 312, internal groove; 313, semicircular oil passage; 32, magnetic core shaft; 4, upper lubricating bearing; 5, integral front yoke sleeve. DETAILED DESCRIPTION

[0017] The specific embodiments of the present application and the shapes, structures, mutual positions and connecting relationships between the parts, functions and working principles of the components involved will be further described in detail below with reference to the drawings and the description of the embodiments: As shown in the drawings Figure 1 - the drawings Figure 7The application is a middle-placed VVT electromagnet structure, an outer convex platform 113 and an inner convex platform 114 are arranged on the integrated rear yoke sleeve 11, the outer convex platform 113 and the inner convex platform 114 form an annular groove 112, an outer circular sidewall 311 and an inner groove 312 are arranged on the magnetic core body 31, the outer circular sidewall 311 of the magnetic core body 31 is accommodated in the annular groove 112, a center hole 117 is arranged in the inner circle of the inner convex platform 114, a lower lubricating bearing 2 is arranged inside the center hole 117, a solid flat surface 115 is arranged at the bottom of the center hole 117, the inner convex platform 114 is accommodated in the inner groove 312 of the magnetic core body 31, a shell center hole is arranged in the middle of the shell 13, the integrated front yoke sleeve 5 is connected in the shell center hole in an interference fit, the magnetic core shaft 32 is connected to the integrated front yoke sleeve 5 through the upper lubricating bearing 4 close to one end, and the magnetic core shaft 32 is connected to the integrated rear yoke sleeve 11 through the lower lubricating bearing 2 close to the other end. The above structure improves the technical scheme for the deficiencies in the prior art. When the structure is arranged, the magnetic core body subassembly 3 adopts double lubricating bearings (the lower lubricating bearing 2 and the upper lubricating bearing 4) as a support structure, only the lower lubricating bearing 2 and the upper lubricating bearing 4 contact the magnetic core shaft 32 of the magnetic core body subassembly, and other parts of the magnetic core body 31 do not contact the integrated rear yoke sleeve 11 and other components, thereby effectively reducing the contact area between the magnetic core body 31 and other components, reducing the friction force of the relative moving parts, avoiding abnormal wear of the magnetic core body 31 due to friction after long-time work, improving the service life of the electromagnet, and at the same time, reducing the friction force, reducing the hysteresis of the electromagnet, and improving the adjustment accuracy of the electromagnet. At the same time, the integrated rear yoke sleeve 11 and the mounting seat of the lubricating bearing (the lower lubricating bearing 2 and the upper lubricating bearing 4) are designed in an integrated structure, are integrally sintered by using a powder metallurgy process, the integrated rear yoke sleeve 11 and the shell 13 are positioned by using a high-precision tool inner hole, and are laser welded, so that the concentricity between the inner and outer circles of the integrated rear yoke sleeve 11 and the shell center hole is always kept within 0.06 mm during use, and eccentric jamming after assembly of the parts is effectively prevented.

[0018] The middle-placed VVT electromagnet structure includes a solenoid subassembly 1, a lower lubricating bearing 2, a magnetic core body subassembly 3, an upper lubricating bearing 4, and an integrated front yoke sleeve 5. The solenoid subassembly 1 includes an integrated rear yoke sleeve 11, a coil assembly 12, a shell 13, and an injection body 14, and the magnetic core body subassembly 3, the solenoid subassembly 1, and the integrated front yoke sleeve 5 constitute a magnetic circuit in space. The above structure improves the electromagnet structure to meet the working and use requirements.

[0019] One side end surface of the coil assembly 12 is in contact with the outer circle of the outer step 113 of the integrated rear yoke sleeve 11, and the other side end surface of the coil assembly 12 is in contact with the inner hole end surface of the shell 13. The above structure fixes the integrated rear yoke sleeve 11 and the shell 13 to reliably install the coil assembly 12.

[0020] The upper lubricating bearing 4 is fixed in the central hole of the integrated front yoke sleeve 5, and the lower lubricating bearing 2 is fixed in the central hole 117 of the integrated rear sleeve 12. The bottom of the magnetic core 31 has an internal groove 312, which accommodates the lower lubricating bearing 2 and its mounting seat 114. The outer circumference of the central hole 117 has multiple oil passage grooves 116. The magnetic core 31 and the magnetic core shaft 32 are riveted together to form the magnetic core sub-assembly 3. The magnetic core shaft 32 passes through the magnetic core 31, and both ends of the magnetic core shaft 32 protrude from the magnetic core 31. The magnetic core shaft 32 is housed in the axial inner hole 22 of the upper lubricating bearing 4 and the lower lubricating bearing 2. The magnetic core 31 is housed in the annular groove 112 of the integrated rear yoke sleeve 11. The gasket between the magnetic core 31 and the integrated front yoke sleeve 11 is eliminated, and magnetic isolation is achieved by air gap. The outer shell 13 and the integrated rear yoke sleeve 11 are provided with multiple welding sections 15 on the outer side of their bottom. The outer shell 13 and the integrated rear yoke sleeve 11 are fixedly connected by the welding sections 15. The coil assembly 12 is accommodated inside the cavity between the outer shell 13 and the integrated rear yoke sleeve 11. The upper lubrication bearing 4 and the lower lubrication bearing 2 are both of rolled structure. The outer circle of the upper lubrication bearing 4 and the lower lubrication bearing 2 are provided with openings 21. The inner hole 22 adopts a low-friction PTFE spraying process to ensure wear resistance and low friction of the moving pair. The outer surface of the magnetic core shaft 32 is treated with QPQ salt bath composite treatment, and the outer surface hardness reaches HV900 or above, ensuring wear resistance and low friction of the moving pair. The outer side of the central hole of the magnetic core body 31 is provided with multiple semi-circular oil grooves 313.

[0021] The centrally located VVT electromagnet structure described in this invention, such as Figure 1 It mainly consists of 5 components: 1. Solenoid sub-assembly; 2. Lower lubricating bearing; 3. Magnetic core sub-assembly; 4. Upper lubricating bearing; 5. Integrated front yoke sleeve; Figure 2 The solenoid subassembly 1 is further composed of an integrated rear yoke sleeve 11, a coil assembly 12, a housing 13, and an injection-molded body 14. For example... Figure 4 The magnetic core assembly 3 is further composed of a magnetic core 31 and a magnetic core shaft 32. The connection relationship of the electromagnet structure is as follows: the electromagnet includes a solenoid assembly 1, which is composed of an integrated rear yoke sleeve 11, a coil assembly 12, a housing 13, and an injection-molded body 14, as shown below. Figure 2As shown, one side end surface of the coil assembly 12 is connected with the outer circle of the outer step 113 of the integral rear yoke sleeve 11, and the other side end surface is connected with the end surface of the inner hole of the shell 13. The shell 13 is fixed with the upper end surface of the integral rear yoke sleeve 11 through laser welding, and the central hole is arranged in the middle of the shell 13 and is connected with the integral front yoke sleeve 5 in an interference manner. The upper lubricating bearing 4 is fixed in the central hole of the integral front yoke sleeve 5, and the lower lubricating bearing 2 is fixed in the central hole 117 of the integral rear sleeve 12. The bottom of the magnetic core body 31 is provided with a recess 312, which accommodates the lower lubricating bearing 2 and the mounting seat 114. The magnetic core body 31 and the magnetic core shaft 32 are fixed by riveting to form the magnetic core body subassembly 3. The magnetic core shaft 32 is accommodated in the axial inner hole 22 of the upper and lower lubricating bearings 24, and the magnetic core body 31 is accommodated in the double boss recess 112 of the integral rear yoke sleeve 11. The magnetic core body subassembly 3, the solenoid subassembly 1 and the integral front yoke sleeve 5 constitute a magnetic circuit in space. The working principle is that when the coil assembly 12 is energized, the solenoid subassembly 1, the magnetic core body subassembly 3 and the integral front yoke sleeve 5 form a magnetic circuit to generate an electromagnetic force. Since the solenoid subassembly 1, the coil assembly 12 and the shell 13 are relatively fixed, the integral front yoke sleeve 5, the upper lubricating bearing 4 and the lower lubricating bearing 2 are all fixed in an interference manner, and the magnetic core body 31 and the magnetic core shaft 32 are fixed by interference riveting to form the magnetic core body subassembly 3. The upper lubricating bearing 4 and the lower lubricating bearing 2 support the magnetic core shaft 32 like Figure 1 When the coil assembly 12 is energized, the magnetic core body subassembly 3 is subjected to an electromagnetic force and moves axially to realize position control of the magnetic core shaft 32.

[0022] The key protection points of the structure of the present application are that the upper lubricating bearing 4 is fixed in the central hole of the integral front yoke sleeve 5, the lower lubricating bearing 2 is fixed in the central hole 117 of the integral rear sleeve 12, the bottom of the magnetic core body 31 is provided with an internal recess 312, the internal recess 312 accommodates the lower lubricating bearing 2 and the mounting seat 114, the magnetic core body 31 and the magnetic core shaft 32 are fixed by riveting to form the magnetic core body subassembly 3, the magnetic core shaft 32 is accommodated in the axial inner hole 22 of the upper and lower lubricating bearings 24, and the magnetic core body 31 is accommodated in the double boss recess 112 of the integral rear yoke sleeve 11. The gap between the magnetic core body and the integral front yoke sleeve is cancelled and relies on an air gap for magnetic separation. The shell 13 and the bottom outside of the integral rear yoke sleeve 11 are provided with a welding section 15, and the coil assembly 12 is accommodated in the interiors of the two (such as Figure 8 ). The magnetic core shaft 32 penetrates the magnetic core body 31, and the two ends of the magnetic core shaft 32 protrude from the magnetic core body 31 to form the magnetic core body subassembly 3. The magnetic core body subassembly 3 is supported by the double lubricating bearings (the lower lubricating bearing 2 and the upper lubricating bearing 4), and the double lubricating bearings adopt a rolled structure, the outer circle is provided with an opening 21, and the inner hole 22 adopts a PTFE spraying process with low friction (such as Figure 3QPQ salt bath composite treatment is adopted on the outer surface of the magnetic core shaft 32, the hardness of the outer surface is more than HV900, and the wear resistance and low friction of the moving pair are ensured. The internal recess 312 is arranged in the magnetic core body 31, and three semicircular oil grooves 313 are arranged outside the center hole (as shown in Figure 5 ). The electromagnetic rear yoke sleeve and the lubricating bearing mounting seat are designed in an integrated structure, and are combined into an integrated rear yoke sleeve 11. The outer boss 113 and the inner boss 114 are designed on the upper part of the integrated rear yoke sleeve 11 (as shown in Figure 6 ). The outer boss 113 and the inner boss 114 form an annular groove 112, which is used for accommodating the outer circular sidewall 311 of the magnetic core body 31, reducing the axial space, and the inner boss 114 is provided with a center hole 117 for fixing the lower lubricating bearing 2 and is accommodated in the internal recess 312 of the magnetic core body 31. The bottom of the center hole 117 is provided with a solid plane 115 for supporting and limiting the magnetic core shaft 32, and the outer circle of the center hole 117 is provided with two oil grooves 116 for lubrication.

[0023] The application is described above in conjunction with the drawings, and it is obvious that the specific implementation of the application is not limited by the above method. Any improvement or direct application of the application to other occasions is within the protection scope of the application.

Claims

1. A centrally located VVT electromagnet structure, characterized in that: An outer boss (113) and an inner boss (114) are provided on the integrated rear yoke sleeve (11). The outer boss (113) and the inner boss (114) form an annular groove (112). An outer circular sidewall (311) and an inner groove (312) are provided on the magnetic core (31). The outer circular sidewall (311) of the magnetic core (31) is housed in the annular groove (112). The inner ring of the inner boss (114) is provided with a central hole (117). A lower lubricating bearing (2) is provided inside the central hole (117). The bottom of the center hole (117) is provided with a solid plane (115), and the inner boss (114) is housed in the inner groove (312) of the magnetic core (31). The outer shell (13) is provided with a center hole (117) in the middle. The integrated front yoke (5) is interference-fitted in the center hole of the outer shell. The magnetic core shaft (32) is connected to the integrated front yoke (5) near one end through the upper lubricating bearing (4), and the magnetic core shaft (32) is connected to the integrated rear yoke (11) near the other end through the lower lubricating bearing (2).

2. The centrally located VVT electromagnet structure according to claim 1, characterized in that: The centrally mounted VVT electromagnet structure includes a solenoid sub-assembly (1), a lower lubricating bearing (2), a magnetic core sub-assembly (3), an upper lubricating bearing (4), and an integrated front yoke sleeve (5).

3. The centrally located VVT electromagnet structure according to claim 2, characterized in that: The solenoid sub-assembly (1) includes an integrated rear yoke sleeve (11), a coil assembly (12), a housing (13) and an injection molded body (14). The magnetic core sub-assembly (3), the solenoid sub-assembly (1), and the integrated front yoke sleeve (5) form a magnetic circuit in space.

4. The centrally located VVT electromagnet structure according to claim 3, characterized in that: One end face of the coil assembly (12) contacts the outer ring of the outer step (113) of the integrated rear yoke sleeve (11), and the other end face of the coil assembly (12) contacts the inner hole end face of the outer shell (13).

5. The centrally located VVT electromagnet structure according to claim 1 or 2, characterized in that: The upper lubricating bearing (4) is fixed in the center hole of the integrated front yoke sleeve (5), and the lower lubricating bearing (2) is fixed in the center hole (117) of the integrated rear yoke sleeve (12). The bottom of the magnetic core (31) is provided with an internal groove (312), which accommodates the lower lubricating bearing (2) and its mounting seat (114). The outer circle of the center hole (117) is provided with multiple oil passage grooves (116).

6. The centrally located VVT electromagnet structure according to claim 5, characterized in that: The magnetic core (31) and the magnetic core shaft (32) are fixed together by riveting to form a magnetic core sub-assembly (3). The magnetic core shaft (32) passes through the magnetic core (31), and both ends of the magnetic core shaft (32) protrude from the magnetic core (31). The magnetic core shaft (32) is housed in the axial inner hole (22) of the upper lubricating bearing (4) and the lower lubricating bearing (2). The magnetic core (31) is housed in the annular groove (112) of the integrated rear yoke sleeve (11).

7. The centrally located VVT electromagnet structure according to claim 5, characterized in that: The gasket between the magnetic core (31) and the integrated front yoke (11) is removed, and magnetic isolation is achieved by relying on the air gap.

8. The centrally located VVT electromagnet structure according to claim 1 or 2, characterized in that: The outer shell (13) and the integrated rear yoke sleeve (11) are provided with multiple welding sections (15) on the outer side of the bottom. The outer shell (13) and the integrated rear yoke sleeve (11) are fixedly connected by the welding sections (15). The coil assembly (12) is accommodated in the cavity between the outer shell (13) and the integrated rear yoke sleeve (11).

9. The mid-mounted VVT electromagnet structure according to claim 1 or 2, characterized in that: The upper lubricating bearing (4) and the lower lubricating bearing (2) are both rolled structures. The outer circle of the upper lubricating bearing (4) and the lower lubricating bearing (2) are provided with an opening (21), and the inner hole (22) is made of low-friction PTFE spraying process.

10. The mid-mounted VVT electromagnet structure according to claim 1 or 2, characterized in that: The magnetic core (31) has multiple semi-circular oil passage grooves (313) on the outside of the central hole.

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