KR101926682B1 - Valve assembly with improved combination structure of return spring - Google Patents

Valve assembly with improved combination structure of return spring Download PDF

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Publication number
KR101926682B1
KR101926682B1 KR1020170000286A KR20170000286A KR101926682B1 KR 101926682 B1 KR101926682 B1 KR 101926682B1 KR 1020170000286 A KR1020170000286 A KR 1020170000286A KR 20170000286 A KR20170000286 A KR 20170000286A KR 101926682 B1 KR101926682 B1 KR 101926682B1
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KR
South Korea
Prior art keywords
rotary gear
cylindrical cam
return spring
housing
insertion hole
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Application number
KR1020170000286A
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Korean (ko)
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KR20180080388A (en
Inventor
조형근
Original Assignee
주식회사 코렌스
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Application filed by 주식회사 코렌스 filed Critical 주식회사 코렌스
Priority to KR1020170000286A priority Critical patent/KR101926682B1/en
Priority to PCT/KR2017/000144 priority patent/WO2018124360A1/en
Publication of KR20180080388A publication Critical patent/KR20180080388A/en
Application granted granted Critical
Publication of KR101926682B1 publication Critical patent/KR101926682B1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/67—Pintles; Spindles; Springs; Bearings; Sealings; Connections to actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/66—Lift valves, e.g. poppet valves
    • F02M26/68—Closing members; Valve seats; Flow passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
    • F02M26/65—Constructional details of EGR valves
    • F02M26/72—Housings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/52—Mechanical actuating means with crank, eccentric, or cam
    • F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/52—Mechanical actuating means with crank, eccentric, or cam
    • F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
    • F16K31/52408—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a lift valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/53—Mechanical actuating means with toothed gearing

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

The present invention provides a valve assembly with improved rotary gear operation, comprising: a rotary gear rotatable about a central axis in a vertical direction by a force externally applied, the non-circular insertion hole formed on a central axis; A cylindrical cam having an upper end inserted into the insertion hole and integrally rotated with the rotary gear, capable of being lifted and lowered, and having two or more slide grooves inclined obliquely on an outer circumferential surface thereof; Wherein the cylindrical cam and the lifting and lowering are integrally formed so that rotation can be independently performed, a poppet shaft passing through the rotation axis of the cylindrical cam; A valve seat coupled to a lower side of the poppet shaft; A housing surrounding the bottom and sides of the cylindrical cam; At least two bearing units, one end of which is fixedly coupled to the housing and the other end of which is inserted into the respective slide groove in a slidable manner; A cover surrounding the upper surface and the side surface of the rotary gear and having a pressing protrusion extending downward at a portion corresponding to the upper surface of the rotary gear; And a return spring that is formed in a coil spring shape and is seated between a bottom surface of the rotary gear and an upper surface of the housing to apply an upward elastic force to the rotary gear, And the return spring is spread over the plurality of mounting hooks on the upper side.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a valve assembly having improved return spring fastening structure,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a valve assembly for vertically moving a valve seat by converting rotational motion of a rotary gear into rectilinear motion of a poppet shaft using a cylindrical cam, and more particularly to a valve assembly for assembling a return spring for applying upward elasticity So that the process can be simplified and the return spring can stably maintain the fastened state.

Generally, the exhaust gas of an automobile is a gas which is compressed in a cylinder at a high temperature and a high pressure in the cylinder, and then expanded into the atmosphere through an exhaust manifold. Most of these exhaust gases are water vapor and carbon dioxide, and other harmful substances such as carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx).

BACKGROUND ART An exhaust gas recirculation system (EGR) is a means for reducing nitrogen oxides in an exhaust gas. A part of the exhaust gas is sent back to an intake manifold to reduce the combustion temperature when the gas mixture is burned, Is reduced. That is, the nitrogen oxide (NOx) can lower the combustion temperature to reduce the amount of combustion, and the combustion temperature is most influenced by the combustion speed, so the density of the cylinder mixer is lowered without changing the air-fuel ratio of the cylinder mixer itself. Therefore, when the burning rate is lowered and the increase of the combustion temperature is suppressed, the nitrogen oxide can be reduced as a result.

An exhaust gas recirculation valve (EGR valve) is provided between the exhaust manifold and the intake manifold to open / close the passage by controlling the EGR valve only in revolutions other than the idle and warm-up. The EGR valve is opened in accordance with the amount of opening of the throttle valve in the revolutions other than idle and warm-up, and the exhaust gas is partially recirculated to the intake manifold of the engine so as to minimize the reduction of the engine output, It lowers the temperature and reduces the emission of nitrogen oxides (NOx).

The conventional EGR valve constructed as described above has a structure in which rotational motion is changed to linear motion by using a fixed cylindrical cam. In such a conventional EGR valve, when the valve seat opens and closes the passage, There is a problem in that wear of the valve seat is increased and thus reliability of opening and closing is lowered.

In order to solve such a problem, a valve assembly (Korean Patent Registration No. 10-1604415), which is constructed so as to be lifted and lowered only without rotating when the valve seat is opened or closed, is filed and registered by the applicant of the present invention have.

Hereinafter, a conventional valve assembly will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a conventional valve assembly.

As shown in FIG. 1, a conventional valve assembly includes a rotary gear 10 having a polygonal hole 11 formed on a central axis thereof rotated by a rotational axis about a central axis in a vertical direction by a force externally applied thereto, A cylindrical cam 20 having a polygonal head 22 inserted into the cylindrical cam 20 and having an inclined slide groove 21 formed on an outer circumferential surface thereof and a poppet shaft A valve seat 40 coupled to a lower side of the poppet shaft 30; a housing (not shown) surrounding the cylindrical cam 20; And a bearing unit 60 to which the other end is fixedly coupled to the housing.

The polygonal head 22 provided on the upper side of the cylindrical cam 20 is slightly smaller than the polygonal hole 11 of the rotary gear 10. The cylindrical cam 20 is rotatably supported by the rotary gear 10, The rotation gear 10 is rotated integrally with the rotation gear 10, but when the rotation speed is received from the outside, the rotation gear 10 is coupled to the rotation gear 10 and can be independently raised or lowered. That is, when the polygonal head 22 is inserted into the polygonal hole 11 and the rotary gear 10 is rotated in a state where one side of the bearing unit 60 is inserted into the slide groove 21, So that one side of the bearing unit 60 slides along the longitudinal direction of the slide groove 21. [0050] In this case, since the bearing unit 60 is fixedly coupled to the housing, the cylindrical cam 20 rotates. In the valve assembly according to the present invention, the cylindrical cam 20 performs only one of rotation, The valve seat 40 and the valve seat 40 coupled to the valve seat 30 are configured to move in the vertical direction while simultaneously implementing the rotation and the elevation.

The poppet shaft 30 is formed in a bar shape (circular rod shape) having a circular cross-section so as to be independently rotatable with the cylindrical cam 20, A disk-shaped flange is mounted at a position corresponding to the upper surface of the cylindrical cam 20, with a step formed at the end of the portion inserted into the cylindrical cam 20. Therefore, when the cylindrical cam 20 is lifted and lowered while rotating, the poppet shaft 30 and the valve seat 40 coupled thereto are not rotated but only move up and down along the cylindrical cam 20.

When the cylindrical cam 20 is lifted, only the cylindrical cam 20 moves up and down without rotating the rotary gear 10. The rotary gear 10 moves up and down along the cylindrical cam 20 to generate operating noise and vibration May occur. A return spring 71 for applying an upward elastic force to the rotary gear 10 is provided under the rotary gear 10. Until the rotary gear 10 is assembled, the rotary gear 10 and the return spring 71 The rotary gear 10 and the return spring 71 have to be individually transferred to the assembly line.

When the rotary gear 10 is assembled to the cylindrical cam 20, the rotary gear 10 must be transferred in the direction in which the return spring 71 is compressed. When inserted into the polygonal hole 11 of the rotary shaft 10, when the external force for pressing down the rotary gear 10 is released, the rotary gear 10 is rotated upward by the restoring force of the return spring 71 And the assembly with the cylindrical cam 20 is released.

KR 10-1604415 B1

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a method of assembling a rotary cam, And the upper end of the cylindrical cam is not pulled out of the rotary gear when the upper end is inserted into the rotary gear, so that the assembly failure rate is significantly reduced.

According to an aspect of the present invention, there is provided a valve assembly having improved rotary gear operation, comprising: a valve assembly rotatable about a central axis in a vertical direction by a force externally applied thereto and having a non-circular A rotary gear having an insertion hole; A cylindrical cam having an upper end inserted into the insertion hole and integrally rotated with the rotary gear, capable of being lifted and lowered, and having two or more slide grooves inclined obliquely on an outer circumferential surface thereof; Wherein the cylindrical cam and the lifting and lowering are integrally formed so that rotation can be independently performed, a poppet shaft passing through the rotation axis of the cylindrical cam; A valve seat coupled to a lower side of the poppet shaft; A housing surrounding the bottom and sides of the cylindrical cam; At least two bearing units, one end of which is fixedly coupled to the housing and the other end of which is inserted into the respective slide groove in a slidable manner; A cover surrounding the upper surface and the side surface of the rotary gear and having a pressing protrusion extending downward at a portion corresponding to the upper surface of the rotary gear; And a return spring that is formed in a coil spring shape and is seated between a bottom surface of the rotary gear and an upper surface of the housing to apply an upward elastic force to the rotary gear, And the return spring is spread over the plurality of mounting hooks on the upper side.

The mounting hook is formed such that the upper end side thereof is convex.

An insertion pipe extending downward to be inserted into the housing is formed in a portion of the bottom surface of the rotary gear where the insertion hole is formed, an insertion pillar inserted into the insertion hole is formed on the upper side of the cylindrical cam, At the upper end of the column, there is provided at least one latching protrusion protruding outward, and a locking hook protruding inwardly to be caught by the latching jaw is provided at the lower end of the inner circumferential surface of the insertion hole.

The upper surface of the latching jaw is formed to be inclined downward toward the outer side, and the bottom surface of the locking hook is formed to be inclined upward toward the outer side.

And a cutout groove is formed in a portion of the lower end of the insertion tube where the fastening hook is formed.

The cross section of the incision groove is formed in an arc shape along the circumferential direction of the insertion tube.

The valve assembly according to the present invention can maintain the state where the return spring is coupled to the rotary gear before assembling the rotary gear to the cylindrical cam so that it is very easy to assemble and when the upper end of the cylindrical cam is inserted into the rotary gear, Since the upper end of the cylindrical cam can not be easily detached from the rotary gear, the assembly failure rate is very low.

1 is a perspective view of a conventional valve assembly.
2 is a cross-sectional perspective view showing the internal structure of the valve assembly according to the present invention.
3 and 4 are a perspective view and a bottom perspective view showing a shape in which the return spring spans the rotating gear.
5 and 6 are a perspective view and a bottom perspective view showing a configuration in which a torque is applied to the return spring and the return spring is detached from the mounting hook.
7 is an exploded perspective view of the rotary gear and the cylindrical cam.
8 is a cross-sectional view showing a coupling structure of the rotary gear and the cylindrical cam.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, an embodiment of an improved valve assembly according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view showing the internal structure of the valve assembly according to the present invention, FIGS. 3 and 4 are a perspective view and a bottom perspective view showing a shape in which a return spring spans a rotary gear, And FIG. 8 is a perspective view and a bottom perspective view showing a shape in which a torque is applied to the spring and the return spring is detached from the mounting hook.

The valve assembly using the cylindrical cam 200 according to the present invention is a device for moving the valve seat 400 up and down by converting the rotational force transmitted from the outside into a linear feed force. As shown in FIG. 2, A rotary gear 100 rotatably mounted on the rotary shaft 100 and having a non-circular insertion hole 110 formed on a central axis thereof, A cylindrical cam 200 which is integrally rotated with the gear 100 and is movable up and down and has two or more slide grooves 210 inclined obliquely at an outer circumferential surface thereof and a cylindrical cam 200 integrally formed with the cylindrical cam 200, A valve seat 400 coupled to a lower side of the poppet shaft 300 and a valve seat 400 coupled to a lower surface of the cylindrical cam 200. The valve seat 400 is connected to the lower surface of the cylindrical cam 200, A housing (5 Two or more bearing units 600 each having one side fixedly coupled to the housing 510 and the other side inserted into the respective slide grooves 210 (see FIGS. 7 and 8) in a slidable manner, And a cover 520 surrounding the upper and side surfaces of the rotary gear 100.

The rotary gear 100 is configured to have a cap shape whose edge portion extends downward, and gear teeth are formed on an outer surface of a downwardly extending portion, and are configured to rotate by a rotational force provided from a drive motor 800. Generally, since the rotational force of the drive motor 800 is very fast, it is preferable to be configured to be transmitted to the rotary gear 100 after being decelerated through a plurality of gears. When the upper ends of the insertion holes 110 and the cylindrical cam 200 inserted therein are formed in a circular shape, the cylindrical cam 200 and the rotary gear 100 can be independently rotated, The upper end of the cylindrical cam 200 may be formed in a shape that is formed in a shape that matches with the insertion hole 110. In this case, The shape of the insertion hole 110 may be polygonal or various other metaphysical shapes as long as the shape of the insertion hole 110 is non-circular.

The upper end of the cylindrical cam 200 is shaped to be fitted with the insertion hole 110 of the rotary gear 100 and is slightly smaller than the insertion hole 110. The cylindrical cam 200 Is integrally rotated with the rotary gear 100 when the rotary gear 100 is rotated, but when it is transmitted from the outside, it is coupled to the rotary gear 100 and is raised or lowered independently . That is, when the upper end of the cylindrical cam 200 is inserted into the insertion hole 110 and the other end of the bearing unit 600 is inserted into the slide groove 210, the drive motor 800 is operated to rotate the rotary gear 100 The cylindrical cam 200 rotates together with the rotary gear 100 and the other side of the bearing unit 600 slides along the longitudinal direction of the slide groove 210.

In this case, since the bearing unit 600 is fixedly coupled to the housing 510, the cylindrical cam 200 rotates. In the valve assembly according to the present invention, the cylindrical cam 200 is rotated The valve seat 400 is configured to move the poppet shaft 300 and the valve seat 400 coupled to the valve seat 400 in the vertical direction while simultaneously implementing rotation and elevation. That is, the poppet shaft 300 is formed in a bar shape (circular rod shape) having a circular cross section so as to be rotatable independently of the cylindrical cam 200, and can be raised and lowered integrally with the cylindrical cam 200 A disc-shaped flange is mounted at a position corresponding to the upper surface of the cylindrical cam 200. A guide pipe 700 for guiding the movement direction of the poppet shaft 300 is provided at an upper portion of the poppet shaft 300 so that the poppet shaft 300 can only move up and down. Therefore, when the cylindrical cam 200 is rotated and lifted simultaneously, the poppet shaft 300 and the valve seat 400 only move up and down in the vertical direction. A magnet 710 for detecting the lift distance of the poppet shaft 300 is provided on the outer surface of the guide pipe 700 and an insert pipe 710 is welded to the inner circumferential surface of the guide pipe 700, 730).

When the cylindrical cam 200 is lifted up, only the cylindrical cam 200 moves up and down without rotating the rotary gear 100. By the frictional force between the upper side of the cylindrical cam 200 and the insertion hole 110, A phenomenon may occur in which the piston 100 moves up and down along the cylindrical cam 200. Since the operation noise and the vibration may increase when the rotary gear 100 is lifted and lowered along the cylindrical cam 200, the rotary gear 100 is interposed between the bottom surface of the rotary gear 100 and the upper surface of the housing 510, And a return spring 530 for applying an upward elastic force to the spring 530. When the return spring 530 is provided as described above, the rotary gear 100 is kept in contact with the cover 520 at all times. As a result, the rotary gear 100 does not move up and down along the cylindrical cam 200 No.

The return spring 530 and the rotary gear 100 are coupled in a laminated structure between the housing 510 and the cover 520. The return spring 530 and the return spring 530 are separated from each other, It may be difficult to assemble the cover 520 after the return spring 530 and the rotary gear 100 are stacked.

The valve assembly according to the present invention is characterized in that the return spring 530 can be supplied to the assembly line in a state where the return spring 530 is assembled to the rotary gear 100 in order to solve such a problem. For example, as shown in FIGS. 3 and 4, a plurality of mounting hooks 102 protruding inward are formed at the edge of the rotary gear 100, and the upper line of the return spring 530 is connected to a plurality of mounts And can be configured to assemble to the rotary gear 100 as a load over the hook 102.

In this state, when the upper side of the return spring 530 is laid over the plurality of mounting hooks 102, even if only the rotary gear 100 is carried and carried, the return spring 530 is also carried together, and the return spring 530 is moved to the housing The cover 520 can be easily assembled in a state where the cover 520 is placed on the support frame 510.

When the upper line of the return spring 530 is mounted on the plurality of the mounting hooks 102, the mounting hook 102 (see FIG. 2) is fixed so that the return spring 530 is not detached from the mounting hook 102 against the intention of the operator. May be formed such that the upper end side thereof is convex. When the top surface of the mounting hook 102 is convexly formed, the upper line of the return spring 530 may be overlaid on the convex surface of the mounting hook 102 even if the horizontal force is applied to the return spring 530. [ The return spring 530 can more stably maintain the state of being mounted on the mounting hook 102, that is, the state of being assembled to the rotary gear 100.

The upper end of the return spring 530 is connected to the rotary gear 100 and the lower end of the return spring 530 is connected to the housing 510, A torque is applied to the return spring 530 in a direction in which the return spring 530 is wound. 5 and 6, when the torque is applied to the return spring 530 in the winding direction, the upper line of the return spring 530 is connected to the mounting hook (not shown) 102).

That is, after the return spring 530 is assembled, the return spring 530 is separated from the mounting hook 102, so that even if the return spring 530 is compressed in the vertical direction, it is interfered with the mounting hook 102 There is an advantage that the phenomenon does not occur.

Fig. 7 is an exploded perspective view of the rotary gear 100 and the cylindrical cam 200, and Fig. 8 is a cross-sectional view showing a coupling structure of the rotary gear 100 and the cylindrical cam 200. Fig.

When the cover 520 is assembled to the housing 510 while the return spring 530 and the rotary gear 100 are stacked between the cover 520 and the housing 510 as described above, The return spring 530 is inserted into the insertion hole 110 of the rotary gear 100 and the return spring 530 is compressed by the lowering rotary gear 100, 100) upward.

The upper portion of the cylindrical cam 200 is simply inserted into the insertion hole 110 of the rotary gear 100. When the cover 520 is assembled to the housing 510, Is moved upward by the elastic force of the return spring 530 and is separated from the cylindrical cam 200, thereby making it impossible to assemble the parts normally.

When the upper side of the cylindrical cam 200 is once inserted into the insertion hole 110 of the rotary gear 100 and the return spring 530 elastically presses the rotary gear 100 upward, There is another feature in that the upper side of the cam 200 is not completely removed from the insertion hole 110.

That is, a portion of the bottom surface of the rotary gear 100 where the insertion hole 110 is formed is formed with an insertion tube 112 extending downward to be inserted into the housing 510, An insertion pillar 220 to be inserted into the insertion hole 110 is formed on the upper side of the insertion hole 220. One or more locking protrusions 222 protruding outward are provided on the upper end of the insertion pillar 220, A locking hook 114 protruding inwardly to be engaged with the locking protrusion 222 may be provided.

When the insertion tube 112 is formed on the bottom surface of the rotary gear 100 and the insertion pillar 220 is formed on the upper side of the cylindrical cam 200, the rotary gear 100 is lowered to be assembled to the cylindrical cam 200 The insertion pillar 220 of the cylindrical cam 200 is inserted into the insertion tube 112 of the rotary gear 100 (more specifically, the insertion hole 110) (114) goes over the latching jaw (222). The fastening hooks 114 that ride over the fastening protrusions 222 can not pass over the fastening protrusions 222 upward even if the elastic force of the return spring 530 is applied to the rotary gear 100, 220 are not detached from the insertion tube 112.

That is, after the rotary gear 100 is once inserted into the cylindrical cam 200, even if the elastic force of the return spring 530 is applied, the rotary gear 100 is not separated from the cylindrical cam 200, Accordingly, the position of the rotary gear 100 can be kept constant.

At this time, the locking hooks 114 can easily fall downward, but the upper surface of the locking protrusion 222 is inclined downward toward the outer side so that the locking protrusion 222 can not easily pass upward. And the bottom surface of the fastening hook 114 is formed to be inclined upward toward the outer side. A detailed description of the detailed structure and operation principle of the fastening hook 114 will be omitted, since the fastening hook 114 configured to be easily assembled but difficult to be separated is widely used in various fields.

On the other hand, the fastening hooks 114 can easily ride downward on the fastening hooks 222 as the projecting distance becomes short. However, if the fastening hooks 114 are short, the fastening hooks 222 can easily ride upwards. The valve assembly according to the present invention is characterized in that when the clamping hook 114 is moved downward while the clamping jaw 222 is moved downward, that is, when the inclined surface of the clamping hook 114 and the inclined surface of the clamping jaw 222 are pressed, It is preferable that the fastening hook 114 is set so as to be pushed outward (in a direction away from the engaging step 222).

In order to easily push the fastening hook 114 outwardly, the insertion tube 112 is preferably made of a material having high ductility and elasticity. The insertion tube 112 is made of a material having high ductility and elasticity There is a possibility of breakage and deformation due to external force.

Accordingly, even if the insertion tube 112 is made of a material having a high strength, the valve assembly according to the present invention can be easily inserted into the insertion tube 112 so that the fastening hook 114 can be easily pushed outward when the fastening hook 114 is pressed against the fastening protrusion 222. [ A cutout groove 116 may be formed at a position where the fastening hook 114 is formed. When the cutout groove 116 is formed in the lower end of the insertion tube 112 at a position corresponding to the fastening hook 114, the inner wall of the insertion tube 112 at the point where the fastening hook 114 is formed is thin So that the fastening hook 114 can be pushed outward easily.

In this case, the incision groove 116 is formed in the lower end of the insertion tube 112 so as to extend over the entire region where the fastening hook 114 is formed. As shown in this embodiment, It is preferably formed in an arc shape.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the scope of the present invention is not limited to the disclosed exemplary embodiments. It will also be appreciated that many modifications and variations will be apparent to those skilled in the art without departing from the scope of the present invention.

100: rotary gear 102: mounting hook
110: insertion hole 112: insertion tube
114: fastening hook 116: incision groove
200: cylindrical cam 210: slide groove
220: insert pillar 222: latching jaw
300: Poppet shaft 400: Valve seat
510: housing 520: cover
530: return spring 600: bearing unit
700: guide pipe 710: magnet
730: insert pipe 800: drive motor

Claims (6)

A rotary gear rotatable about a central axis in the vertical direction by a force externally applied and formed with non-circular insertion holes on the central axis;
A cylindrical cam having an upper end inserted into the insertion hole and integrally rotated with the rotary gear, capable of being lifted and lowered, and having two or more slide grooves inclined obliquely on an outer circumferential surface thereof;
Wherein the cylindrical cam and the lifting and lowering are integrally formed so that rotation can be independently performed, a poppet shaft passing through the rotation axis of the cylindrical cam;
A valve seat coupled to a lower side of the poppet shaft;
A housing surrounding the bottom and sides of the cylindrical cam;
At least two bearing units, one end of which is fixedly coupled to the housing and the other end of which is inserted into the respective slide groove in a slidable manner;
A cover surrounding the upper surface and the side surface of the rotary gear and having a pressing protrusion extending downward at a portion corresponding to the upper surface of the rotary gear; And
And a return spring that is formed in a coil spring shape and is seated between a bottom surface of the rotary gear and an upper surface of the housing to apply an upward elastic force to the rotary gear,
A plurality of mounting hooks protruding inward are formed at edges of the rotary gear,
Wherein the return spring has an upper side over the plurality of mounting hooks,
Wherein an insertion tube extending downward is formed at a portion of the bottom surface of the rotary gear where the insertion hole is formed to be inserted into the housing,
An insertion pillar inserted into the insertion hole is formed on the upper side of the cylindrical cam,
And at least one latching protrusion protruding outward is provided at an upper end of the insertion column,
And a fastening hook protruding inwardly to be caught by the latching jaw is provided at the lower end of the inner circumferential surface of the insertion hole. The method according to claim 1,
Wherein the mounting hook is formed such that the upper end side of the mounting hook is convex. delete The method according to claim 1,
The upper surface of the latching jaw is formed to be inclined downward toward the outer side,
Wherein the bottom surface of the locking hook is formed with an upward slope toward the outside. The method according to claim 1,
And an incision groove is formed in a portion of the lower end of the insertion tube where the fastening hook is formed. Claim 5
Wherein the cross-section of the incision groove is formed in an arc shape along the circumferential direction of the insertion tube.
KR1020170000286A 2017-01-02 2017-01-02 Valve assembly with improved combination structure of return spring KR101926682B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020170000286A KR101926682B1 (en) 2017-01-02 2017-01-02 Valve assembly with improved combination structure of return spring
PCT/KR2017/000144 WO2018124360A1 (en) 2017-01-02 2017-01-05 Valve assembly having improved return spring coupling structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020170000286A KR101926682B1 (en) 2017-01-02 2017-01-02 Valve assembly with improved combination structure of return spring

Publications (2)

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KR20180080388A KR20180080388A (en) 2018-07-12
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KR102628122B1 (en) 2018-12-20 2024-01-23 남양넥스모 주식회사 Shock absorbing structure for vehicle steering

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