JP2019044673A - Coil spring unit - Google Patents

Abstract

To provide a technology which can easily attach a coil spring to a support member for supporting the coil spring, and can suppress a fall of the coil spring from the support member.SOLUTION: A coil spring unit comprises a coil spring having a coiled main body and an end part extending toward the outside of a radial direction of the main body from the main body, and a support member for supporting the coil spring. The support member comprises: a seat part abutting on the main body at the end part side; a first lock part which is arranged with a clearance from the seat part to the radial direction of the main body; and a second lock part which is arranged at the main body side with the seat part and the end part sandwiched from the first lock part in an axial direction of the main body, and arranged between the seat part and the first lock part in the radial direction of the main body. The second lock member may be arranged while opposing an opening which is formed in the clearance between the seat part and the first lock part.SELECTED DRAWING: Figure 3

Description

  The present specification relates to a coil spring unit provided with a coil spring.

  Patent Document 1 discloses a throttle device provided with a coil spring unit. The coil spring unit comprises a coil spring and a spring mounting member. The coil spring includes a coil-shaped coil portion and a terminal portion disposed at an end of the coil portion and bent inward in the radial direction of the coil portion.

  The coil spring is attached to the spring attachment member by being inserted into an engagement groove in which the end portion is disposed in the spring attachment member and engaged with the engagement wall.

JP 2008-240610 A

  In the manufacture of a device comprising a coil spring unit, there is a need for a smooth operation up to the attachment of the coil spring unit to the device.

  In this specification, a coil spring can be easily attached to the support member which supports a coil spring, and the technique which controls that a coil spring falls from a support member is provided.

  The technology disclosed herein relates to a coil spring unit. The coil spring unit may include a coil spring having a coil-like main body and an end portion extending outward in the radial direction of the main body from the main body, and a support member for supporting the coil spring. Good. The support member has a seat that abuts the main body on the end side, a first locking part disposed at a distance from the seat in the radial direction of the main body, and a shaft of the main body In the direction from the seat portion and the first locking portion to the main body side, and between the seat portion and the first locking portion in the radial direction of the main body The second locking portion may be disposed to face an opening located at the distance between the seat portion and the first locking portion.

  In this configuration, when attaching the coil spring to the support member, the end portion is inserted from the second locking portion side into the opening, and is inserted beyond the seat portion and the first locking portion. From this state, the attitude of the coil spring is changed so that the main body abuts on the seat and the end abuts on the second locking portion. At this time, when the main body is twisted and elastically deformed in the direction in which the diameter of the main body decreases, the position of the end portion is moved to the main body side along with the radial reduction of the main body. Thus, the end portion can pass through the opening without contacting the first locking portion and can abut on the second locking portion. Then, by releasing the elastic deformation of the main body, the end is moved radially outward of the main body so as to be disposed between the first locking portion and the second locking portion. As a result, the end can be disposed between the first locking portion and the second locking portion. Thereby, the coil spring can be easily attached to the support member. In addition, the end portion is pinched by the first locking portion, the second locking portion, and the seat portion which are offset from each other along the radial direction of the main body, that is, the extension direction of the end portion. However, it is possible to suppress shifting so as to incline with respect to the first locking portion, the second locking portion, and the seat portion. Thus, the coil spring can be prevented from falling from the support member. As a result, the operation of attaching the coil spring unit to the device can be smoothly performed.

  The radial length of the main body of the opening may be longer than the axial distance of the main body between the first locking portion and the second locking portion. When attaching the coil spring to the support member by making the opening between the first locking portion and the seat portion relatively long, it is easy to insert the end into the opening from the second locking portion side it can. On the other hand, the end of the coil spring moves in the gap between the first locking portion and the second locking portion by relatively shortening the distance between the first locking portion and the second locking portion. Can be suppressed. Thus, it is possible to suppress the end portion from being inclined to be inclined with respect to the first locking portion, the second locking portion, and the seat portion, and to suppress the coil spring from falling from the support member. Can.

  In the radial direction of the main body, the distance between the outer end of the seat and the inner end of the second locking portion is the distance between the outer end of the second locking portion and the inner end of the first locking portion. It may be longer than the distance. According to this configuration, when the end portion is inserted from the second locking portion side into the opening beyond the seat portion and the first locking portion, the first locking portion is prevented from being difficult to insert. Can. Thereby, the coil spring can be easily attached to the support member.

  In the radial direction of the main body, the distance between the outer end of the second locking portion and the inner end of the first locking portion is the distance between the outer end of the seat portion and the inner end of the second locking portion. It may be longer than the distance. According to this configuration, it is possible to suppress that the end portion is inclined to be inclined with respect to the first locking portion, the second locking portion, and the seat portion.

  The support member may further include a barrier that is in contact with the end portion between the first locking portion and the second locking portion in the axial direction of the main body. According to this configuration, in a state where the coil spring is attached to the support member, when the main body is twisted and elastically deformed in the direction in which the diameter of the main body is reduced, the barrier presses the end portion to elastically move the main body It can be deformed. Thereby, the coil spring can be easily attached to the support member.

  The support member may include a gear attached to a rotation shaft of a valve body which is disposed so as to open and close a fluid flow path by rotation. According to this configuration, it is possible to speed up the production of the valve device provided with the valve body.

The perspective view of the EGR valve apparatus of an Example is shown. The EGR valve apparatus of an Example shows the side view in the state where some parts containing a cover in the state of full closure were removed. The perspective view of the coil spring unit single-piece | unit of an Example is shown. The perspective view of the coil spring of an Example is shown. The perspective view of the main gear of an Example is shown. The front view of the main gear of an Example is shown. The sectional view which expanded the spring hook part among the VII-VII sections of Drawing 6 is shown. The perspective view for demonstrating the procedure of attaching the coil spring of an Example to the main gear is shown. In the procedure of attaching the coil spring of an Example to the main gear, sectional drawing of the VII-VII cross section of FIG. 6 of the state which follows FIG. 8 is shown. FIG. 10 is a cross-sectional view taken along the line VII-VII of FIG. 6 for explaining the procedure for attaching the coil spring of the embodiment following the example of FIG. 9 to the main gear. The enlarged view which looked at the valve body of the Example from the front is shown. Sectional drawing of the XII-XII cross section of FIG. 11 is shown. In the XII-XII cross section of FIG. 11, a cross-sectional view in a fully open state is shown. FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG. 6 for explaining a mold for molding the main gear. The sectional view which expanded the spring hook part among the VII-VII sections of Drawing 6 in a 2nd example is shown.

(First embodiment)
The coil spring unit 10 of this embodiment will be described. The coil spring unit 10 is disposed in an EGR (abbreviation of Exhaust Gas Recirculation) valve device 50. First, the EGR valve device 50 will be described.

(Configuration of EGR valve device)
FIG. 1 shows a perspective view of the EGR valve device 50. As shown in FIG. The EGR valve device 50 is used in a so-called exhaust gas recirculation system in which part of exhaust gas discharged from the engine of a vehicle is returned to the intake path. The EGR valve device 50 is disposed on a circulation path that communicates the exhaust path with the intake path, and switches between the exhaust path and the intake path by opening and closing the circulation path. Thereby, the flow rate of the exhaust gas circulated from the exhaust path to the intake path is adjusted.

  The EGR valve device 50 is a so-called double eccentric valve. FIG. 2 shows a side view with some parts including the cover 54 removed when the EGR valve device 50 is in a fully closed state. As shown in FIGS. 1 and 2, the EGR valve device 50 includes an EGR body 52, a cover 54, a valve body 56, a valve shaft 58, a coil spring unit 10, an intermediate gear 62, and a motor gear 66. And a motor 70. The motor 70 is accommodated in the EGR body 52.

  The EGR body 52 is made of an aluminum alloy. The EGR body 52 includes a circulation pipe 52a. Circulation pipe 52a is disposed as part of a circulation path of the vehicle. The circulation pipe 52 a penetrates the EGR body 52.

  The EGR body 52 accommodates the motor 70, the coil spring unit 10, the intermediate gear 62, and the motor gear 66. The accommodation space of the EGR body 52 is closed by the cover 54. The cover 54 is made of resin.

  The EGR body 52 rotatably supports the valve body 56 via a valve shaft 58. The valve shaft 58 is rotatably supported by the EGR body 52. The valve body 56 is disposed in the circulation pipe 52a. In the fully closed state, the valve body 56 is in contact with a valve seat 53 disposed in the circulation pipe 52a.

  FIG. 11 shows an enlarged view of the valve body 56 as viewed from the front, and FIG. 12 shows a cross-sectional view of the XII-XII cross section of FIG. FIG. 13 shows the valve body 56, the valve stem 58 and the valve seat 53 in the fully open state in the XII-XII cross section of FIG. An axis X1 of the valve shaft 58 extends in a direction perpendicular to the circulation pipe 52a. The axis X1 is eccentric in the direction of the central axis X2 of the circulation pipe 52a with respect to the center C1 of the valve seat 53, and eccentric in the orthogonal direction with respect to the axis X1 and the central axis X2. The detailed configuration of the EGR valve device 50 is described in, for example, Japanese Patent No. 5759646 and US Patent No. 2017152953.

  As shown in FIG. 2, the main gear 12 is disposed at one end of the valve shaft 58. The main gear 12 is fixed to the valve shaft 58. The main gear 12 is made of resin. The main gear 12 is rotatably disposed in the EGR body 52. The main gear 12 meshes with the intermediate gear 62.

  The intermediate gear 62 includes a small gear (not shown) engaged with the main gear 12, and a large gear 64 fixed adjacent to the small gear and coaxially arranged with the small gear. The large gear 64 meshes with the motor gear 66. The intermediate gear 62 is rotatably supported by the EGR body 52 via a pin 68.

  The motor gear 66 is fixed to the drive shaft of the motor 70. The motor 70 is driven in accordance with a signal from an ECU (abbreviation of Engine Control Unit). When the motor 70 is driven, the drive shaft rotates. Thereby, the main gear 12 is rotated via the motor gear 66 and the intermediate gear 62. As a result, the valve body 56 moves between the fully closed state and the fully open state through the valve shaft 58. The motor gear 66 and the intermediate gear 62 are made of the same resin as the main gear 12.

(Details of coil spring unit)
The main gear 12 is included in the coil spring unit 10. The coil spring unit 10 biases the valve body 56 toward the fully closed state (that is, counterclockwise in FIG. 2) by the drive of the motor 70. The coil spring unit 10 includes a coil spring 14 in addition to the main gear 12.

(Configuration of coil spring)
As shown in FIGS. 3 and 4, the coil spring 14 includes a main body 40, a gear side end 42 and a body side end 44. The main body 40 is configured in a coil shape, that is, in a spiral shape. The main body 40 is arranged such that the axis X1 of the valve stem 58 coincides with the central axis of the main body 40. A body side end 44 is disposed at an end of the EGR body 52 of the main body 40. The body side end 44 is bent at an end of the main body 40 and extends outward in the radial direction of the main body 40. A gear side end 42 is disposed at the end of the main body 40 opposite to the EGR body 52, that is, at the end on the cover 54 side. The gear side end 42 is bent at an end of the main body 40 and extends outward in the radial direction of the main body 40. The gear side end 42 is positioned substantially opposite to the body side end 44 across the main body 40.

(Configuration of main gear)
The main gear 12 is disposed on the opposite side of the main body 40 to the EGR body 52. As shown in FIGS. 3, 5 and 6, the main gear 12 includes a seat portion 20, a gear portion 22, a spring holding portion 24, a shaft holding portion 26, a stopper 28, and a spring hook portion 30. Equipped with The seat portion 20 has an annular flat shape. The seat portion 20 abuts on the end of the main body 40 opposite to the EGR body 52.

  A spring holding portion 24 is disposed on the inner peripheral side of the seat portion 20. The spring holding portion 24 has a cylindrical shape. The spring holding portion 24 is disposed parallel to the valve shaft 58 from the surface of the seat portion 20 on the side of the coil spring 14. The spring holding portion 24 is arranged such that the axis X1 of the valve stem 58 coincides with the central axis. The outer diameter of the spring holding portion 24 is slightly smaller than the inner diameter of the main body 40. The spring holding portion 24 is inserted inside the main body 40. Thereby, radial positioning of the main body 40 with respect to the main gear 12 of the coil spring 14 is performed.

  A shaft holding portion 26 is disposed at an end of the spring holding portion 24 on the EGR body 52 side. The shaft holding portion 26 is disposed on the inner peripheral side of the spring holding portion 24. The shaft holding portion 26 has a flat plate shape, and has an opening at its center. At the center of the shaft holding portion 26, a valve shaft 58 is inserted and fixed.

  The gear portion 22 is disposed at a part of the outer peripheral edge of the seat portion 20. The gear portion 22 has a plurality of teeth arranged continuously toward the outside of the seat portion 20. The gear portion 22 meshes with the small gear of the intermediate gear 62.

  A stopper 28 is disposed at one end of the gear portion 22 in the circumferential direction of the seat portion 20, that is, in the rotational direction of the main gear 12. The stopper 28 is disposed at the outer peripheral edge of the seat portion 20. The stopper 28 protrudes more toward the EGR body 52 than the gear portion 22. As shown in FIG. 2, when the valve 56 is in the fully closed state, the stopper 28 abuts against the fully closed stopper 52 b of the EGR body 52. This prevents the main gear 12 from further rotating counterclockwise. On the other hand, when the valve body 56 is fully open, the stopper 28 abuts against a fully open stopper (not shown) of the EGR body 52. This prevents the main gear 12 from further rotating clockwise.

  A spring hook portion 30 is disposed at the other end of the gear portion 22 in the circumferential direction of the seat portion 20, that is, in the rotational direction of the main gear 12. The spring hook portion 30 is disposed at the outer peripheral edge of the seat portion 20. The spring hook portion 30 includes locking portions 32, 34.

  FIG. 7 shows an enlarged cross-sectional view of the spring hook portion 30 in the VII-VII cross section of FIG. In addition, the coil spring 14 is also shown by FIG. The locking portion 32 is spaced from the seat portion 20 in the radial direction of the main body 40 (that is, the X direction in FIG. 7, hereinafter, the radial direction of the main body 40 may be referred to as “X direction”). ing. The circumferential length of the main body 40 of the locking portion 32 is longer than the wire diameter of the coil spring 14. The locking portion 32 is provided with a contact surface 32 a which is flush with the surface of the seat 20 on which the coil spring 14 contacts. The contact surface 32 a is in contact with the tip of the gear side end 42 of the coil spring 14. The base end of the gear side end 42 (that is, the end on the main body 40 side) is in contact with the seat 20. The locking portion 32 extends outward in the X direction beyond the tip of the gear side end 42.

  An opening 36 is disposed between the locking portion 32 and the seat portion 20. Between the seat portion 20 and the locking portion 32, the opening 36 may call the main gear 12 in the axial direction of the main body 40 (that is, the Y direction in FIG. 7; hereinafter, the axial direction of the main body 40 as the "Y direction"). There is a penetration). The length of the opening 36 in the X direction is shorter than the length of the gear end 42.

  The locking portion 34 is disposed on the main body 40 side across the gear side end 42 from the seat portion 20 and the locking portion 32 in the Y direction, and between the seat portion 20 and the locking portion 32 in the X direction. That is, it is disposed at a position opposite to the opening 36. The circumferential length of the main body 40 of the locking portion 34 is longer than the wire diameter of the coil spring 14 like the locking portion 32. In the X direction, the outer end of the locking portion 34 is disposed at a position substantially the same as or slightly inside the inner end of the locking portion 32 (the distance W3 in FIG. 7). On the other hand, in the X direction, the inner end of the locking portion 34 is located outside the outer end of the seat 20. Therefore, when viewed from the coil spring 14 side, the inner end of the opening 36 is located inside the inner end of the locking portion 34 in the X direction. The distance W4 between the locking portion 32 and the seat portion 20 and the locking portion 34 in the Y direction is shorter than the length W1 of the opening 36 in the X direction, and is substantially the same as the wire diameter of the coil spring 14. The gear side end 42 is sandwiched and positioned at three different positions in the X direction by the locking portions 32 and 34 and the seat portion 20.

  According to this configuration, even if the coil spring 14 tries to shift in the axial direction of the main body 40 from the main gear 12, the coil spring is brought about by the abutment of the locking portions 32 and 34 and the seat portion 20 with the gear side end 42. Positional displacement of the main body 40 in the axial direction can be suppressed. Furthermore, the gear side end 42 in contact with the locking portion 34 is prevented from tilting with respect to the locking portions 32 and 34 in order to contact the locking portion 32. Thus, the gear side end 42 can be firmly held by the locking portions 32 and 34. The coil spring 14 is positioned with respect to the main gear 12 both in the axial direction of the main body 40 and in a direction perpendicular to the axial direction. Thus, the coil spring 14 can be prevented from falling off the main gear 12.

  In the X direction, the distance W2 between the outer end of the seat 20 and the inner end of the locking portion 34 is longer than the distance W3 between the outer end of the locking portion 34 and the inner end of the locking portion 32.

  The spring hook portion 30 further includes barriers 38 disposed at both circumferential ends of the main body 40 of the locking portions 32, 34. The barrier 38 has a flat plate shape that is disposed along the entire length of the locking portions 32 and 34 in the X direction. The barrier 38 is disposed between the locking portion 32 and the locking portion 34 in the Y direction. According to this configuration, when the coil spring 14 rotates about the axis of the main body 40, the gear side end 42 abuts on the barrier 38. Thereby, the gear side end 42 can be prevented from being separated from the spring hook portion 30.

  Further, in the EGR valve device 50, when the coil spring unit 10 is attached to the EGR body 52, the body side end 44 is in contact with a hook portion (not shown) disposed on the EGR body 52. , Toward the EGR body 52. Then, the main body 40 is pulled to separate the main gear 12 from the EGR body 52. Thereby, the main gear 12 can be separated to a position not interfering with the EGR body 52. From this state, the coil spring unit 10 is attached to the EGR body 52 by twisting and elastically deforming so that the diameter of the main body 40 becomes smaller. When the body side end 44 is pressed toward the EGR body 52 to separate the main gear 12, a force is applied in a direction in which the gear side end 42 is inclined with respect to the locking portions 32 and 34. However, since the inclination of the gear side end 42 is suppressed by the locking portions 32 and 34, the coil spring 14 can be suppressed from falling off the main gear 12.

(How to attach the coil spring to the main gear)
The method for attaching the coil spring 14 to the main gear 12 will be described with reference to FIGS. As shown in FIG. 8, first, the main body 40 is inclined with respect to the axial direction of the spring holding portion 24, and the gear side end 42 is opened beyond the locking portion 34 as shown by the arrow in FIG. 8. Insert in 36 Thereby, as shown in FIG. 9, the gear side end 42 protrudes from the opening 36 beyond the locking portion 32 and the seat portion 20. Therefore, when attaching the coil spring 14 to the main gear 12, the opening 36 protrudes in a state where the gear side end 42 is inclined from the attached state (the state shown in FIG. 3) (the state shown in FIGS. It has only to have possible dimensions. As shown in FIG. 7, in the X direction, the distance W2 between the outer end of the seat portion 20 and the inner end of the locking portion 34 is the distance W3 between the outer end of the locking portion 34 and the inner end of the locking portion 32. Since it is longer than this, it is possible to suppress the difficulty of inserting the gear side end 42 by the locking portion 32. Thus, the coil spring 14 can be easily attached to the main gear 12. Further, in this state, when the coil spring 14 is moved so that the axial direction of the main body 40 is parallel to the axial direction of the spring holding portion 24 (that is, in the direction of the arrow in FIG. 9), the gear side end 42 is locked. It contacts the part 32.

  Then, from the state of FIG. 9, the main body 40 is twisted and elastically deformed so that the diameter of the main body 40 becomes small. At this time, the barrier 38 abuts on the gear side end 42 and the barrier 38 presses the gear side end 42 so that the main body 40 can be elastically deformed. Thus, the coil spring 14 can be easily attached to the main gear 12. As a result, as shown in FIG. 10, the gear side end 42 moves to a position where it does not abut on the locking portion 32. In the state shown in FIG. 10, the coil spring 14 is moved by moving the coil spring 14 so that the axial direction of the main body 40 is positioned in parallel with the axial direction of the spring holding portion 24 to restore elastic deformation of the main body 40. It is attached to the gear 12.

  According to this configuration, the coil spring 14 can be easily attached to the main gear 12.

  Further, as shown in FIG. 14, when the main gear 12 is resin-molded by the molding die 100, the locking portion 32 is positioned between the locking portion 34 and the seat portion 20 in the radial direction of the main body 40. Therefore, the spring hook portion 30 can be easily molded by arranging the convex shapes 102 and 104 in the mold 100.

Second Embodiment
Points different from the first embodiment will be described with reference to FIG. In the present embodiment, in the X direction, the distance W3 between the outer end of the locking portion 34 and the inner end of the locking portion 32 is greater than the distance W2 between the outer end of the seat 20 and the inner end of the locking portion 34. long. According to this configuration, it is possible to prevent the gear side end 42 from being shifted so as to be inclined with respect to the locking portions 32 and 34 and the seat 20.

  As mentioned above, although the specific example of this invention was described in detail, these are only an illustration and do not limit a claim. The art set forth in the claims includes various variations and modifications of the specific examples illustrated above.

  (1) The coil spring unit 10 can be used, for example, in a throttle device or other devices other than the EGR valve device 50.

  (2) The support member of the coil spring unit 10 may not have the gear portion 22 like the main gear 12.

  The technical elements described in the present specification or the drawings exhibit technical usefulness singly or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the techniques exemplified in the present specification or the drawings can simultaneously achieve a plurality of purposes, and achieving one of the purposes itself has technical utility.

10: coil spring unit 12: main gear 14: coil spring 20: seat portion 22: gear portion 24: spring holding portion 26: shaft holding portion 28: stopper 30: spring hook portion 32: locking portion 32a: contact surface 34 Locking portion 36: Opening 40: Body 42: Gear side end 44: Body side end 50: EGR valve device

Claims (6)

A coil spring comprising a coiled main body and an end portion extending from the main body radially outward of the main body;
And a support member for supporting the coil spring.
The support member is
A seat that abuts the body at the end side;
A first locking portion disposed at a distance from the seat in the radial direction of the main body;
In the axial direction of the main body, the seat portion and the first locking portion are disposed on the main body side across the end portion, and in the radial direction of the main body, the seat portion and the first locking portion And a second locking portion disposed between the
The coil spring unit, wherein the second locking portion is disposed to face an opening located at the distance between the seat portion and the first locking portion.   2. The coil spring unit according to claim 1, wherein the radial length of the main body of the opening is longer than a distance between the first locking portion and the second locking portion in the axial direction of the main body. .   In the radial direction of the main body, the distance between the outer end of the seat and the inner end of the second locking portion is the distance between the outer end of the second locking portion and the inner end of the first locking portion. The coil spring unit according to claim 1, which is longer than the distance.   In the radial direction of the main body, the distance between the outer end of the second locking portion and the inner end of the first locking portion is the distance between the outer end of the seat portion and the inner end of the second locking portion. The coil spring unit according to claim 1, which is longer than the distance.   The said support member is further provided with the barrier which contact | abuts the said edge part between the said 1st latching | locking part and the said 2nd latching | locking part in the said axial direction of the said main body, The any one of Claim 1 to 4 The coil spring unit according to any one of the preceding claims. The coil spring according to any one of claims 1 to 5, wherein the support member includes a gear attached to a rotation shaft of a valve body arranged to open and close a flow path of fluid by rotation. unit.