JP2014029177A - Buffer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To commonalize a coil body between buffers whose harness take-out directions of control valves are different.SOLUTION: After lead wires 41, 42 are connected to a coil body 35, by bending a harness support member 53, a harness take-out direction of a mold coil 34 can be adjusted. Consequently, the coil body 35 can be commonalized between the mold coils 34 whose harness take-out directions are different.

Description

  The present invention relates to a damping force adjusting shock absorber.

  For example, as a damping force adjusting type shock absorber incorporated in a suspension device of a vehicle such as an automobile, a damping force generating mechanism in which a valve opening pressure of a control valve (see Patent Document 1 or the like) is adjusted by a control current energized to a solenoid. What is provided is well known. Since the damping force generating mechanism is attached under the spring of the suspension device, power supply to the control valve having a solenoid is usually performed by a harness in consideration of impact resistance, waterproofness, earthquake resistance, and the like. Generally, a molded coil is used as a control valve for a damping force generation mechanism of a shock absorber.

JP-A-9-310779

  In the above shock absorber, the direction in which the harness is taken out from the control valve (hereinafter referred to as the harness taking out direction) varies depending on the vehicle type depending on the suspension layout. The harness take-out direction can be adjusted to the rotation direction with the coil axis as the center of rotation when the control valve is assembled, but the angle with respect to the coil axis cannot be adjusted after the coil is molded. . Therefore, conventionally, it has been necessary to store for each vehicle type a coil body (coil that has not been overmolded before molding) in a different harness take-out direction, which has been a factor in increasing the manufacturing cost of the shock absorber.

  Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to make a coil main body common between shock absorbers having different control valve harness extraction directions.

  In order to solve the above problem, a shock absorber according to the present invention includes a cylinder in which a working fluid is sealed, a piston inserted into the cylinder, a piston rod connected to the piston and extending to the outside of the cylinder, A damping force generating mechanism that generates a damping force by controlling the flow of the working fluid generated in the passage by the expansion and contraction of the piston rod, and the damping force generating mechanism has a valve opening pressure that is controlled by a control current applied to the mold coil. A shock absorber having a control valve to be adjusted, wherein the mold coil has a bobbin, a pair of terminals fixed to one end of the bobbin, and one end side wound around the bobbin and connected to one terminal. A magnet wire whose other end is connected to the other terminal, a harness in which a pair of lead wires are connected to each terminal, A grommet into which a pair of lead wires are inserted, a grommet accommodating portion that is formed at one end of the bobbin and accommodates the grommet, and is formed by a flexible member, and one end is fixed to the grommet accommodating portion And a harness support member that extends outward from the grommet housing portion and has the other end engaged with the outer skin portion of the harness, and an overmold that forms an outer skin of the molded coil. A portion between the other end portion of the harness support member and the grommet is not covered with the outer skin portion.

  According to the present invention, the coil main body can be shared between the shock absorbers having different harness extraction directions of the control valve.

It is sectional drawing by the axial plane of the buffer of this embodiment. It is a perspective view of the mold coil of this embodiment. It is a top view of the mold coil of this embodiment. It is a figure when the grommet accommodating part of the mold coil of this embodiment is seen from the line of sight from the front. It is a perspective view of the mold coil of this embodiment, and shows the mold coil by which the harness taking-out direction was adjusted especially. It is a side view of the mold coil of the 1st modification. It is a side view of the mold coil of the 2nd modification. It is explanatory drawing of the mold coil of a 3rd modification, and respond | corresponds to FIG. It is explanatory drawing of the mold coil of a 3rd modification, and is a figure which shows the variation of FIG.

An embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, the shock absorber 1 according to the present embodiment is a damping force adjusting hydraulic shock absorber incorporated in a vehicle suspension device. The shock absorber 1 has a double cylinder structure in which an outer cylinder 3 is provided outside the cylinder 2, and an annular reservoir 4 is formed between the cylinder 2 and the outer cylinder 3. The inside of the cylinder 2 is divided into a first oil chamber 2A and a second oil chamber 2B by the piston 5. The piston 5 is fixed to one end of the piston rod 7 by a nut 6. The piston rod 7 passes through the first oil chamber 2 </ b> A and is inserted into a rod guide 8 and an oil seal 9 attached to one end of the cylinder 2 and the outer cylinder 3, and the other end is extended to the outside of the cylinder 2. A base valve 10 that separates the second oil chamber 2B and the reservoir 4 is provided at the other end of the cylinder 2.

  The piston 5 has passages 11 and 12 that communicate between the first oil chamber 2A and the second oil chamber 2B. A check valve 13 is provided on one end face of the piston 5 to allow only hydraulic oil to move in the passage 12 from the second oil chamber 2B to the first oil chamber 2A. On the other hand, on the other end face of the piston 5, a disk is opened when the pressure in the first oil chamber 2A reaches a predetermined pressure, and the pressure in the first oil chamber 2A is released to the second oil chamber 2B side. A valve 14 is provided.

  The base valve 10 includes passages 15 and 16 that allow communication between the second oil chamber 2B and the reservoir 4. One end face of the base valve 10 is provided with a check valve 17 that allows only hydraulic oil to move from the reservoir 4 to the second oil chamber 2B in the passage 15. On the other hand, on the other end surface of the base valve 10, a disk valve 18 is opened when the pressure in the second oil chamber 2B reaches a predetermined pressure to release the pressure in the second oil chamber 2B to the reservoir 4 side. Is provided. The reservoir 4 is filled with hydraulic oil and gas.

  A separator tube 19 is provided on the outer periphery of the cylinder 2. Annular seal members 20 that are in close contact with the outer peripheral surface of the cylinder 2 are accommodated in the annular grooves formed on the inner peripheral surfaces of the reduced diameter portions at both ends of the separator tube 19. Thereby, an annular passage 21 is formed between the outer peripheral surface of the cylinder 2 and the inner peripheral surface of the separator tube 19. The passage 21 is communicated with the first oil chamber 2A by a passage 22 provided on the side wall of the cylinder 2 on the rod guide 8 side (the upper side in FIG. 1). A branch pipe 23 having a connection port communicating with the passage 21 is provided on the side wall of the separator tube 19 on the base valve 10 side (lower side in FIG. 1) so as to protrude in the radial direction of the separator tube 19. A large-diameter inlet 24 that is coaxial with the branch pipe 23 is opened on the side wall of the outer cylinder 3, and a damping force generating mechanism 25 is attached to the side wall 24 in alignment with the inlet 24.

  The damping force generation mechanism 25 has a cylindrical casing 26 attached to the side wall of the outer cylinder 3. A pilot-type (back-pressure type) main valve 27 and a solenoid-driven pilot valve 28 (control valve) for controlling the valve opening pressure of the main valve 27 are provided in the casing 26. Further, a fail valve 29 that operates at the time of failure is provided downstream of the pilot valve 28. In the damping force generating mechanism 25, the connecting pipe 30 is connected to the connection port of the branch pipe 23, and hydraulic oil is introduced from the connection port of the branch pipe 23 to the connecting pipe 30. The hydraulic oil introduced through the connecting pipe 30 flows into the oil chamber 26 </ b> A in the casing 26 via the main valve 27, the pilot valve 28 and the fail valve 29. The hydraulic oil in the oil chamber 26 </ b> A passes through the passage 31 and the inlet 24 of the outer cylinder 3 and flows into the reservoir 4.

  Here, before the main valve 27 is opened, the hydraulic oil flow is controlled by the pilot valve 28 to generate a damping force. When the main valve 27 is opened, the damping force is mainly generated by the main valve 27. Let A part of the hydraulic oil upstream of the pilot valve 28 is introduced into the back pressure chamber 32 at the back of the main valve 27, and the internal pressure acts in the valve closing direction of the main valve 27. And the damping force generation mechanism 25 controls the valve opening pressure of the pilot valve 27 by the control current supplied to the molded coil 34 by the harness 33, and thereby the damping force is adjusted. Further, the fail valve 29 is closed when the vehicle is stopped or when the supply of the control current to the mold coil 34 is cut off, and restricts the flow of hydraulic oil in place of the pilot valve 27 in the opened state. As a result, an excessive decrease in the damping force is prevented and an appropriate damping force is maintained.

  As shown in FIG. 2, the molded coil 34 is manufactured by molding a coil body 35 to which the harness 33 is connected and covering with a overmold 36. The coil main body 35 is wound around a bobbin 37 formed in a substantially cylindrical shape, a pair of terminals 38 and 39 fixed to one end portion 37A of the bobbin 37, and a thread winding portion 37B of the bobbin 37 to be end portion 40A (see FIG. 3) is connected to one end of one terminal 38, and the other end 40B (see FIG. 3) includes a magnet wire 40 connected to one end of the other terminal 39.

  As shown in FIG. 3, one lead wire 41 of a pair of lead wires 41, 42 extending from one end portion 33 </ b> A of the outer skin portion of the harness 33 is connected to the other end portion of one terminal 38, and the other The other lead wire 42 is connected to the other end of the terminal 39. As a result, the one end 40A of the magnet wire 40 and the one lead wire 41 are connected to be conductive, and the other end 40B of the magnet wire 40 and the other lead wire 42 are connected to be conductive.

  Each terminal 38 and 39 is formed by bending a plate-like electrode member at a plurality of locations, and is held by each terminal holding portion 46 and 47 formed on one end portion 37 </ b> A of the bobbin 37. The terminal holding portions 46 and 47 employ a structure well known to those skilled in the art that holds the terminals 38 and 39 using elastic force generated when the terminals 38 and 39 are deformed.

  The coil body 35 includes a grommet 43 that supports the pair of lead wires 41 and 42. As shown in FIG. 4, the grommet 43 has a pair of insertion holes 44, each having a cross section formed in an oval shape and communicating with one end face and the other end face, and through which the lead wires 41 and 42 are inserted. 45. The grommet 43 is accommodated in a grommet accommodating portion 48 formed at one end portion 37 </ b> A of the bobbin 37.

  The grommet accommodating portion 48 includes a substantially trapezoidal bottom plate 49 (see FIG. 4) extending from one end portion 37A of the bobbin 37 to the radially outer side of the bobbin 37 (right direction in FIG. 3), and an upper surface of the bottom plate 49 (upper surface in FIG. 4). ) And a pair of side plates 50 and 51 arranged in parallel and standing on both sides in the width direction. The side plates 50 and 51 of the grommet accommodating portion 48 are formed in a rectangular shape and are coupled to the ribs 50A and 51A extending from the boss portion 37C of the bobbin 37. The pair of side plates 50 and 51 are connected by a reinforcing plate 52 between the upper end portions (upper end portions in FIG. 4) of the boss portion 37C side.

  The coil body 35 includes a harness support member 53 formed of a flexible plate member such as an aluminum alloy. The harness support member 53 includes an attachment portion 54 (one end portion) attached to the grommet accommodating portion 48, a grip portion 55 (the other end portion) that holds one end portion 33 </ b> A of the outer skin portion of the harness 33, and the attachment portion 54 and the grip portion. And a connecting portion 56 that connects The attachment portion 54 is formed in a channel shape that opens upward (upward in FIG. 4), and is fitted between the pair of side plates 50 and 51 on the bottom plate 49 of the grommet accommodating portion 48.

  The grip portion 55 has a pair of arms disposed on both sides (upper and lower sides in FIG. 3) across the harness 33, and one end portion 33A of the outer skin portion of the harness 33 is a pair of arms caulked by a tool or the like It is pinched by. As a result, the harness 33 is supported at an angle with respect to the axis of the bobbin 37 (hereinafter referred to as the harness take-out direction) by about 90 ° by the harness support member 53 extending from the grommet accommodating portion 48 to the radially outer side of the bobbin 37 (FIG. 2). reference).

  In the present embodiment, in the state where the harness take-out direction shown in FIG. 2 is θ = 90 ° and the harness 33 is supported by the harness support member 53, the connecting portion 56 of the harness support member 53 is bent and plastically deformed, The harness removal direction is set to a predetermined harness removal direction. Thus, in this embodiment, as shown in FIG. 5, it is possible to arbitrarily set the harness take-out direction of the coil body 35. Here, since the part between the grommet 43 and the holding part 55 of the harness support member 53 is not covered with the outer skin part, the harness 33 increases the distance from the axis of the coil body 35 to the one end part 33A of the outer skin part. It is possible to adjust the harness take-out direction without changing it.

  In addition, by filling a mold mold cavity in which a coil body 35 (not shown) is set with mold resin, the coil body 35 is covered with an overmold 36, thereby obtaining a molded coil 34. In addition, by preparing a nest for each harness take-out direction, it is possible to share the main part (upper mold and lower mold) of the mold.

Next, the operation of this embodiment will be described.
The shock absorber 1 is arranged in the direction shown in FIG. 1, that is, with the piston rod 7 side facing upward and the base valve 10 side facing downward, the vehicle suspension side (sprung) and wheel side (unsprung) of the vehicle suspension device. Attached between).

  During the extension process of the piston rod 7, the check valve 13 of the piston 5 closes with the movement of the piston 5 in the cylinder 2, and the pressurized first oil chamber is opened before the disc valve 14 is opened. The hydraulic oil on the 2A side passes through the passage 22 and the passage 21 and flows into the inlet passage of the connecting pipe 30 of the damping force generation mechanism 25 from the connection port of the separator tube 19. The working fluid flowing in from the inlet passage flows into the oil chamber 26A in the casing 26 via the main valve 27, the pilot valve 28, and the fail valve 29, and further, the passage 31 of the casing 26 and the inlet of the outer cylinder 3 It passes through 24 and flows into the reservoir 4.

  At this time, the hydraulic oil corresponding to the withdrawal of the piston rod 7 from the cylinder 2 opens the check valve 17 of the base valve 10 and flows into the second oil chamber 2B. When the pressure in the first oil chamber 2A reaches the valve opening pressure of the disk valve 14 of the piston 5 and the disk valve 14 is opened, the pressure in the first oil chamber 2A is released to the second oil chamber 2B. It is. Thereby, an excessive pressure rise in the first oil chamber 2A is prevented.

  During the contraction stroke of the piston rod 7, the check valve 13 of the piston 5 is opened along with the movement of the piston 5 in the cylinder 2, and the check valve 17 of the passage 15 of the base valve 10 is closed. Before the disc valve 18 is opened, the hydraulic oil in the second oil chamber 2B flows into the first oil chamber 2A, and the hydraulic oil corresponding to the piston rod 7 having entered the cylinder 2 is From the first oil chamber 2A, it flows into the reservoir 4 through the same path as during the extension stroke. When the pressure in the second oil chamber 2B reaches the valve opening pressure of the disk valve 18 of the base valve 10 and the disk valve 18 is opened, the pressure in the second oil chamber 2B is released to the reservoir 4. It is. Thereby, the excessive pressure rise of the 2nd oil chamber 2B is prevented.

  As described above, the damping force generating mechanism 25 generates a damping force by the pilot valve 28 before the main valve 27 is opened when the piston rod 7 is expanded or contracted (low speed range of the piston speed). Is opened (piston speed high speed region), a damping force corresponding to the opening of the main valve 27 is generated. Then, the damping force is adjusted by adjusting the control current supplied to the mold coil 34 to control the valve opening pressure of the pilot valve 28. Thereby, the internal pressure of the back pressure chamber 32 is changed, and the valve opening pressure and the opening degree of the main valve 27 are adjusted. Further, when the vehicle is stopped or when the supply of control current to the mold coil 34 is interrupted, the fail valve 29 is opened, and the flow of the hydraulic oil is restricted by the fail valve 29 instead of the opened pilot valve 28. Is done. Thereby, an excessive fall of damping force is prevented and moderate damping force is maintained.

According to the present embodiment, after the lead wires 41 and 42 are connected to the coil body 35, the harness take-out direction of the molded coil 34 can be adjusted by bending the connecting portion 56 of the harness support member 53. The coil body 35 can be shared between the molded coils 34 having different harness take-out directions, and can be particularly adapted to various kinds of production.
Thereby, it is not necessary to have the coil main body 35 in which the harness take-out direction is different for each vehicle type, and the bobbin 37 and the mold can be consolidated to reduce the types, thereby reducing the manufacturing cost of the shock absorber 1. be able to.

  In addition, since the portions of the lead wires 41 ′ and 42 ′ that are not covered by the outer skin portion of the harness 33 are arranged along the connecting portion 56 of the harness supporting member 53, the outer skin portion of the harness 33 having higher rigidity is used as the connecting portion 56. Compared with the case where they are aligned, the amount of protrusion of the harness extraction portion (distance from the axis of the bobbin 37) can be reduced, and the flexibility of the layout of the shock absorber 1 can be expanded.

Further, the coil body 35 to which the harness 33 is connected can be set in a mold, and the coil body 35 can be easily set in the mold during molding.
Further, since the pair of lead wires 41 and 42 are supported by the grommet 43 accommodated in the grommet accommodating portion 48 formed on the bobbin 37, water enters through the lead wires 41 and 42 in accordance with the adjustment of the harness take-out direction. Can be prevented.

(Modification 1)
In the above embodiment, the harness support member 53 is attached to the bobbin 37 by forming the attachment portion 54 of the harness support member 53 into a channel shape and fitting it into the grommet accommodating portion 48. However, the first modification shown in FIG. Then, one end portion of the harness support member 53 is used as an extension portion of the connecting portion 56, and the extension portion 54 is inserted into a groove formed in the end surface of the bottom plate 49 of the grommet housing portion 48, so that the harness support member 53 is attached to the bobbin 37. Configure to be fixed.
In this case, the shape of the harness support member 53 can be simplified.

(Modification 2)
Moreover, in the modification 2 shown by FIG. 7, the harness support member 53 is comprised by pipe materials, such as a copper pipe and an aluminum pipe, for example. Note that one end of the harness support member 53 is press-fitted into the grommet housing 48.
In this case, by exposing the pair of lead wires 41 and 42 to the harness support member 53, exposure of the lead wires 41 and 42 is reduced. Thereby, the lead wires 41 and 42 can be protected.

(Modification 3)
As shown in FIG. 8, in the third modification, a convex welded portion 57 is formed along the end surfaces of the pair of side plates 50 and 51 of the grommet accommodating portion 48, and the welded portion 57 is melted at the time of molding to overload. Adhere to the mold 36.
In this case, the watertightness of the molded coil 34 can be improved. In addition, as shown in FIG. 9, the watertightness of the molded coil 34 can be further improved by providing double welds 57.

1 shock absorber, 2 cylinder, 5 piston, 7 piston rod, 25 damping force generation mechanism, 33 harness, 34 mold coil, 36 overmold, 37 bobbin, 37A one end (bobbin), 38, 39 terminal, 40 magnet wire, 41, 42 Lead wire, 43 Grommet, 48 Grommet housing part, 53 Harness support member

Claims (2)

A cylinder in which a working fluid is sealed, a piston inserted into the cylinder, a piston rod connected to the piston and extending to the outside of the cylinder, and a flow of the working fluid generated in the passage by the expansion and contraction of the piston rod A damping force generating mechanism that generates a damping force, and the damping force generating mechanism is a shock absorber having a control valve whose valve opening pressure is adjusted by a control current energized to the mold coil,
The mold coil is
A bobbin, a pair of terminals fixed to one end of the bobbin, a magnet wire wound around the bobbin and having one end connected to one terminal and the other end connected to the other terminal; A harness in which a lead wire is connected to each terminal, a grommet through which the pair of lead wires are inserted, a grommet accommodating portion that is formed at one end of the bobbin and accommodates the grommet, and a flexible member A harness support member formed by the one end portion being fixed to the grommet housing portion and extending outward from the grommet housing portion and having the other end portion engaged with the outer skin portion of the harness, and the outer skin of the mold coil. Including an overmold to be formed,
The shock absorber according to claim 1, wherein a portion of the harness between the other end portion of the harness support member and the grommet is not covered with the outer skin portion. The grommet accommodating portion is
A bottom plate extending radially outward from one end of the bobbin, and a pair of side plates disposed on both sides in the width direction of the bottom plate, the end surfaces of the pair of side plates being overmolded by heat during molding The shock absorber according to claim 1, wherein a welded portion to be welded is formed.

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