JP2004239344A - Valve device of hydraulic shock absorber - Google Patents

Valve device of hydraulic shock absorber Download PDF

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Publication number
JP2004239344A
JP2004239344A JP2003028905A JP2003028905A JP2004239344A JP 2004239344 A JP2004239344 A JP 2004239344A JP 2003028905 A JP2003028905 A JP 2003028905A JP 2003028905 A JP2003028905 A JP 2003028905A JP 2004239344 A JP2004239344 A JP 2004239344A
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JP
Japan
Prior art keywords
valve
seat
shock absorber
hydraulic shock
valve device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003028905A
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Japanese (ja)
Inventor
Naoki Fujinuma
直樹 藤沼
Masahiro Watanabe
匡洋 渡辺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Showa Corp
Original Assignee
Showa Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Showa Corp filed Critical Showa Corp
Priority to JP2003028905A priority Critical patent/JP2004239344A/en
Publication of JP2004239344A publication Critical patent/JP2004239344A/en
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Abstract

<P>PROBLEM TO BE SOLVED: To prevent the seizure of a valve and the occurrence of noise while securing the durability of a seat allowing the valve to depart therefrom and seat thereon in a valve device of a hydraulic shock absorber. <P>SOLUTION: In this valve device 40 of the hydraulic shock absorber 10, an annular seat 64 is raised from the peripheral side of a flow passage 53 in a bottom piece 51 (valve support body), and the valve 55 is departed from and seated on the seat 64. The seat 64 comprises a base part 71 gradually narrowed in the rise direction, a narrow valve contact surface 72 allowing the valve 55 to be in contact therewith, and a chamfered part 73 formed at an interfaced portion between the base part 71 and a valve contact surface 72. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は油圧緩衝器のバルブ装置に関する。
【0002】
【従来の技術】
油圧緩衝器のバルブ装置は、ピストンバルブ装置を構成するピストンやボトムバルブ装置を構成するボトムピース等のバルブ支持体に、押し側流路と引き側流路を備え、該バルブ支持体の両端面でそれらの流路の周辺に円環又は非円環の環状シートを立上げ、該シート上にディスクバルブを配置し、流路に作用する油圧によりディスクバルブを該シートに対し離着座させて該流路を開閉する。
【0003】
バルブ装置では、バルブがシートに離着座を繰り返し、開くときのシートへの貼付き、閉じるときのシートとの叩き音等の異音を生ずる。バルブとシートとの接触面積が大きいとバルブの貼付きや異音を生じ易く、小さいと生じにくくなる。
【0004】
従来のシートのバルブ接触面の巾は0.5mm程度であり、バルブの貼付きや異音を生ずることがあった。
【0005】
そこで、特許文献1に記載の如く、シートをバルブに線接触させ、バルブの貼付きや異音の発生を解消するものが提案されている。
【0006】
【特許文献1】
特開平5−79525([0020]、図2)
【0007】
【発明が解決しようとする課題】
シートは、バルブによって常に叩かれる。従って、特許文献1の如くにシートのバルブ接触面積をあまりに小さくすると耐久性が損なわれる。シートの精度が悪いと、バルブとの間に予定外の隙間ができ、減衰特性に悪影響を及ぼす。
【0008】
本発明の課題は、油圧緩衝器のバルブ装置において、バルブが離着座するシートの耐久性を確保しながら、バルブの貼付きや異音の発生を防ぐことにある。
【0009】
【課題を解決するための手段】
請求項1の発明は、バルブ支持体の流路周辺に環状シートを立上げ、該シートにバルブを離着座させる油圧緩衝器のバルブ装置において、シートが、立上り方向に縮巾状をなす基部と、バルブが接触する狭巾のバルブ接触面と、基部とバルブ接触面のつながり部分に設ける面取り部とを備えるようにしたものである。
【0010】
請求項2の発明は、請求項1の発明において更に、前記バルブ接触面の巾が0.3mm〜0.1mmであるようにしたものである。
【0011】
請求項3の発明は、請求項1又は2の発明において更に、前記バルブ支持体が焼結材からなり、前記シートの面取り部が該シートの溝成形時又は最終成形時に、シートの頭部の型押しにて形成されるようにしたものである。
【0012】
【発明の実施の形態】
図1は油圧緩衝器を示す半断面図、図2はピストンバルブ装置を示す拡大断面図、図3はボトムバルブ装置を示す拡大断面図、図4をボトムバルブ装置を示す断面図、図5はシート形状を示す断面図、図6は図4のシートを拡大して示す断面図である。
【0013】
図1は、ストラット型サスペンションを構成する複筒型式油圧緩衝器10であり、ダンパチューブ11を外筒12と内筒13からなる二重管としている。油圧緩衝器10は、外筒12に内蔵の内筒13にピストンロッド14を挿入し、ピストンロッド14の上端部に車体側取付ブラケット(不図示)を結合し、外筒12の下端部をナックルブラケット15により車輪側に連結して車両の懸架装置を構成する。
【0014】
油圧緩衝器10は、外筒12の外周の下スプリングシート16と、ピストンロッド14の上端部の取付ブラケットに支持される上スプリングシート(不図示)の間に懸架ばね(不図示)を介装し、車両走行時の衝撃力を吸収する。
【0015】
油圧緩衝器10は、外筒12に内筒13を立設して内蔵するに際し、内筒13の下端部をボトムピース51を介して外筒12の底部にセンタリングして支持し、内筒13の上端部をロッドガイド18を介して外筒12の上端開口部にセンタリングして支持する。そして、油圧緩衝器10は、ロッドガイド18の上部にピストンロッド14が貫通するオイルシール等の軸封部19を備え、外筒12の上端かしめ部により、軸封部19、ロッドガイド18、内筒13、ボトムピース51を外筒12の底部との間に挟持する。
【0016】
油圧緩衝器10は、ピストンバルブ装置(伸び側減衰力発生装置)20と、ボトムバルブ装置(圧側減衰力発生装置)40とを有し、懸架ばねによる衝撃力の吸収に伴うダンパチューブ11とピストンロッド14の伸縮振動を制振する。
【0017】
(ピストンバルブ装置20)
ピストンバルブ装置20は、図2に示す如く、ピストンロッド14にバルブストッパ21、バルブスペーサ22、チェックバルブ23、ピストン24、ディスクバルブ25、バルブスペーサ26、バルブストッパ27を装着し、これらをナット28で固定している。ピストン24は、内筒13の内部をピストン側ダンパ室29Aとロッド側ダンパ室29Bに区画し、両ダンパ室29A、29Bを連通する押し側流路30Aと引き側流路30Bを形成し、押し側流路30Aにチェックバルブ23を、引き側流路30Bにディスクバルブ25を設けてある。
【0018】
油圧緩衝器10の圧縮時には、ピストン側ダンパ室29Aの油が押し側流路30Aを通ってチェックバルブ23をたわみ変形させて開き、ロッド側ダンパ室29Bに導かれる。伸張時には、ロッド側ダンパ室29Bの油が引き側流路30Bを通ってディスクバルブ25をたわみ変形させて開き、ピストン側ダンパ室29Aに流れ、伸び側減衰力を発生する。
【0019】
(ボトムバルブ装置40)
油圧緩衝器10は、外筒12と内筒13の間をリザーバ室41とし、このリザーバ室41の内部を油室とガス室で区画している。ボトムバルブ装置40は、図3に示す如く、外筒12の底部と内筒13の下端部の間に設けたボトムピース51によりピストン側ダンパ室29Aとリザーバ室41とを区画する。
【0020】
ボトムバルブ装置40は、図4に示す如く、焼結粉末を金型に充填して形成する等により作成された焼結成形体であるボトムピース51に、ピストン側ダンパ室29Aとリザーバ室41とを連通する押し側流路52と引き側流路53を形成している。ボトムバルブ装置40は、押し側流路52を開閉するディスクバルブ54をボトムピース51の下面側に設け、引き側流路53を開閉するチェックバルブ55と該チェックバルブ55を弾発するコイルばね56をボトムピース51の上面側に設ける。ボトムバルブ装置40は、ボトムピース51の下面側からディスクバルブ54に挿通したボルト57を挿入し、ボトムピース51の上面側に突出したボルト57の突出端の周囲にチェックバルブ55とコイルばね56を配置し、ボルト57の突出端にナット58に螺着し、チェックバルブ55とコイルばね56がナット58によりセンタリングされて締結される。ナット58は、ボトムピース51の上面に当接する側に、チェックバルブ55とコイルばね56のセンタリングガイド58Aを備える(図4(A))。ナット58の上面に突出したボルト57の端部はかしめ部59とされ、ナット58の回り止めになる。
【0021】
油圧緩衝器10の圧縮時には、ピストン側ダンパ室29Aの油が押し側流路52を通ってディスクバルブ54をたわみ変形させて開き、リザーバ室41に流れ、圧側減衰力を発生する。伸張時には、リザーバ室41の油が引き側流路53を通ってチェックバルブ55をたわみ変形させて開き、ピストン側ダンパ室29Aに導かれる。
【0022】
しかるに、ボトムバルブ装置40にあっては、図4に示す如く、ディスクバルブ54、チェックバルブ55のためのバルブ支持体としてのボトムピース51において、該ボトムピース51の下面の押し側流路52の内側と外側の周辺に、ディスクバルブ54を離着座させるための環状シート61、62を立上げるとともに、該ボトムピース51の上面の引き側流路53の内側と外側の周辺に、チェックバルブ54を離着座させるための環状シート63、64を立上げている。
【0023】
ボトムバルブ装置40は、シート61〜64の耐久性を確保しながら、バルブ54、55が開くときのシート61〜64への貼付きと、バルブ54、55が閉じるときのシート61〜64との叩き音等の異音の発生を防ぐため、以下の構成を備える。尚、シート61〜64は同様の構成を具備するものであるから、シート64をそれらの代表例として説明する。
【0024】
シート64(シート61〜63も同じ)は、図6に示す如く、ボトムピース51の表面から立上る横断面視で、立上り方向に次第に狭巾となる縮巾状をなす、本実施形態では台形状の基部71と、バルブ55(又は54)が着座するときに接触する狭巾のバルブ接触面72と、基部71とバルブ接触面72のつながり部分(バルブ接触面72の両側のつながり部分)に設ける面取り部73とを備える。
【0025】
シート64は面取り部73をR形状(R面取り)とし、基部71とバルブ接触面72を滑らかにつなぐ。シート64はバルブ接触面72の巾wを0.3mm〜0.1mmの範囲内に定める(図6(B))。
【0026】
ボトムピース51は前述した如くの焼結成形体からなり、シート64(シート61〜63も同じ)を以下の手順で成形する。
【0027】
(1)ボトムピース51の成形工程で、台形状のシート64の粗形状を成形する。この後焼結成形して焼き固める。
【0028】
(2)ボトムピース51の矯正工程(サイジング工程)で、シート64に減衰用オリフィスとなる溝を成形する。この溝の成形と同時に、台形状のシート64の頭部を矯正型で型押しし、面取り部73を押しつぶし、基部71、バルブ接触面72及び面取り部73を成形する。
【0029】
(3)ボトムピース51の仕上げ工程(研磨工程)で、基部71、バルブ接触面72及び面取り部73をもつシート64の仕上げ成形を行なう。この仕上げ工程はなくても良い。
【0030】
尚、矯正型によって面取り部73を押しつぶし、基部71、バルブ接触面72及び面取り部73を成形する工程は、上述(2)のサイジング工程によらず、上述(3)の仕上げ工程で行なっても良い。
【0031】
本実施形態によれば以下の作用がある。
(請求項1、2に対応する作用)
▲1▼シート64(シート61〜63も同じ)が平面状をなすバルブ接触面72を備え、バルブ55(又は54)の荷重を面で受けるから、バルブ55に対して叩かれ強くなり、耐久性が良い。シート64とバルブ55の間に予定外の隙間を生ずることがなく、減衰特性を安定化できる。
【0032】
▲2▼シート64の立上り方向に縮巾状をなす、台形状基部71の上面角をR状に面取りし、バルブ接触面72の巾を、例えば0.3mm〜0.1mmの範囲内の狭巾にした。従って、シート64のバルブ接触面72へのバルブ55の貼付きや、バルブ55との叩き音等の異音の発生を防ぐことができる。
【0033】
▲3▼シート64の台形状基部71の上面角をR状面取り部73とすることにより、バルブ接触面72にバリ等の不要な突起の発生を防ぐことができる。
【0034】
(請求項3に対応する作用)
▲4▼ボトムピース51が焼結材からなり、シート64の面取り部73がシート64の溝成形時又は最終成形時に、シート64の頭部の型押しにて形成される。従って、シート64の面取り部73を矯正型で押しつぶし、シート64のバルブ接触面72及び面取り部73を含む頭部の密度が上がるため硬度が上がり、シート64の耐久性も寸法精度も向上する。
【0035】
尚、本発明において、シートに設ける面取り部は上述した如くのR状(図5(A))に限らず、テーパ状(直線状)(図5(B))でも良い。
【0036】
また、シートの基部、バルブ接触面及び面取り部の全体を切削加工により形成しても良い。
【0037】
以上、本発明の実施の形態を図面により記述したが、本発明の具体的な構成はこの実施の形態に限られるものではなく、本発明の要旨を逸脱しない範囲の設計の変更等があっても本発明に含まれる。例えば、本発明はピストンバルブ装置において、バルブ支持体としてのピストンに設けられるシートに適用することもできる。
【0038】
【発明の効果】
本発明によれば、油圧緩衝器のバルブ装置において、バルブが離着座するシートの耐久性を確保しながら、バルブの貼付きや異音の発生を防ぐことができる。
【図面の簡単な説明】
【図1】図1は油圧緩衝器を示す半断面図である。
【図2】図2はピストンバルブ装置を示す拡大断面図である。
【図3】図3はボトムバルブ装置を示す拡大断面図である。
【図4】図4をボトムバルブ装置を示す断面図である。
【図5】図5はシート形状を示す断面図である。
【図6】図6は図4のシートを拡大して示す断面図である。
【符号の説明】
10 油圧緩衝器
51 ボトムピース(バルブ支持体)
52、53 流路
54、55 バルブ
61〜64 シート
71 基部
72 バルブ接触面
73 面取り部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a valve device for a hydraulic shock absorber.
[0002]
[Prior art]
The valve device of the hydraulic shock absorber is provided with a push-side flow path and a pull-side flow path on a valve support such as a piston constituting a piston valve device and a bottom piece constituting a bottom valve device, and both end faces of the valve support. A circular or non-annular annular seat is raised around those flow paths, a disc valve is arranged on the seat, and the disc valve is separated from and seated on the seat by hydraulic pressure acting on the flow path. Open and close the flow path.
[0003]
In the valve device, the valve repeatedly seats on and departs from the seat, causing sticking to the seat when the valve is opened, and generating an unusual sound such as a tapping sound with the seat when the valve is closed. If the contact area between the valve and the seat is large, sticking of the valve and abnormal noise are likely to occur, and if the contact area is small, it is unlikely to occur.
[0004]
The width of the valve contact surface of the conventional seat is about 0.5 mm, which may cause sticking of the valve or abnormal noise.
[0005]
Therefore, as described in Patent Document 1, there has been proposed a device in which a seat is brought into line contact with a valve to eliminate sticking of the valve and occurrence of abnormal noise.
[0006]
[Patent Document 1]
JP-A-5-79525 ([0020], FIG. 2)
[0007]
[Problems to be solved by the invention]
The seat is constantly beaten by the valve. Therefore, if the valve contact area of the seat is made too small as in Patent Document 1, the durability is impaired. If the accuracy of the seat is poor, an unscheduled gap is formed between the seat and the valve, which adversely affects the damping characteristics.
[0008]
An object of the present invention is to prevent sticking of a valve and generation of abnormal noise in a valve device of a hydraulic shock absorber while securing the durability of a seat on which a valve is detached and seated.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is a valve device for a hydraulic shock absorber that raises an annular seat around a flow path of a valve support, and detaches and seats a valve on the seat, wherein the seat has a base having a narrow width in the rising direction. , A valve contact surface having a narrow width with which the valve contacts, and a chamfered portion provided at a connecting portion between the base and the valve contact surface.
[0010]
According to a second aspect of the present invention, in addition to the first aspect, the width of the valve contact surface is 0.3 mm to 0.1 mm.
[0011]
According to a third aspect of the present invention, in the first or second aspect, the valve support is made of a sintered material, and the chamfered portion of the sheet is formed at the time of forming the groove or the last forming of the sheet. It is formed by embossing.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
1 is a half sectional view showing a hydraulic shock absorber, FIG. 2 is an enlarged sectional view showing a piston valve device, FIG. 3 is an enlarged sectional view showing a bottom valve device, FIG. 4 is a sectional view showing a bottom valve device, and FIG. FIG. 6 is a sectional view showing the shape of the sheet, and FIG. 6 is an enlarged sectional view showing the sheet of FIG.
[0013]
FIG. 1 shows a double-cylinder hydraulic shock absorber 10 constituting a strut-type suspension, in which a damper tube 11 is a double pipe composed of an outer cylinder 12 and an inner cylinder 13. In the hydraulic shock absorber 10, the piston rod 14 is inserted into the inner cylinder 13 built in the outer cylinder 12, the vehicle body side mounting bracket (not shown) is connected to the upper end of the piston rod 14, and the lower end of the outer cylinder 12 is knuckled. The vehicle is connected to the wheel side by a bracket 15 to form a vehicle suspension system.
[0014]
The hydraulic shock absorber 10 has a suspension spring (not shown) interposed between a lower spring seat 16 on the outer periphery of the outer cylinder 12 and an upper spring seat (not shown) supported by a mounting bracket at the upper end of the piston rod 14. And absorbs the impact force when the vehicle is running.
[0015]
The hydraulic shock absorber 10 supports the lower end of the inner cylinder 13 by centering it on the bottom of the outer cylinder 12 via the bottom piece 51 when the inner cylinder 13 is erected and built into the outer cylinder 12. Is centered and supported at the upper end opening of the outer cylinder 12 via the rod guide 18. The hydraulic shock absorber 10 includes a shaft sealing portion 19 such as an oil seal through which the piston rod 14 penetrates above the rod guide 18, and the shaft sealing portion 19, the rod guide 18, The cylinder 13 and the bottom piece 51 are sandwiched between the bottom of the outer cylinder 12 and the bottom piece 51.
[0016]
The hydraulic shock absorber 10 includes a piston valve device (extension-side damping force generator) 20 and a bottom valve device (compression-side damping force generator) 40, and a damper tube 11 and a piston associated with absorption of an impact force by a suspension spring. Vibration of the telescopic vibration of the rod 14 is suppressed.
[0017]
(Piston valve device 20)
As shown in FIG. 2, the piston valve device 20 has a valve stopper 21, a valve spacer 22, a check valve 23, a piston 24, a disc valve 25, a valve spacer 26, and a valve stopper 27 mounted on a piston rod 14, and these nuts 28 It is fixed with. The piston 24 partitions the inside of the inner cylinder 13 into a piston-side damper chamber 29A and a rod-side damper chamber 29B, and forms a push-side flow path 30A and a pull-side flow path 30B that communicate the two damper chambers 29A and 29B. The check valve 23 is provided in the side flow path 30A, and the disc valve 25 is provided in the pull side flow path 30B.
[0018]
When the hydraulic shock absorber 10 is compressed, the oil in the piston-side damper chamber 29A passes through the push-side flow path 30A to deflect and open the check valve 23, and is guided to the rod-side damper chamber 29B. At the time of extension, the oil in the rod-side damper chamber 29B passes through the pull-side flow path 30B to deflect and open the disk valve 25, flows into the piston-side damper chamber 29A, and generates an extension-side damping force.
[0019]
(Bottom valve device 40)
The hydraulic shock absorber 10 has a reservoir chamber 41 between the outer cylinder 12 and the inner cylinder 13, and partitions the interior of the reservoir chamber 41 into an oil chamber and a gas chamber. As shown in FIG. 3, the bottom valve device 40 partitions the piston-side damper chamber 29 </ b> A and the reservoir chamber 41 by a bottom piece 51 provided between the bottom of the outer cylinder 12 and the lower end of the inner cylinder 13.
[0020]
As shown in FIG. 4, the bottom valve device 40 includes a piston-side damper chamber 29 </ b> A and a reservoir chamber 41 on a bottom piece 51, which is a sintered compact formed by filling a mold with sintered powder and forming the same. A push-side flow path 52 and a pull-side flow path 53 communicating with each other are formed. The bottom valve device 40 is provided with a disc valve 54 for opening and closing the push-side flow path 52 on the lower surface side of the bottom piece 51, and a check valve 55 for opening and closing the pull-side flow path 53 and a coil spring 56 for resiliently operating the check valve 55. It is provided on the upper surface side of the bottom piece 51. The bottom valve device 40 inserts the bolt 57 inserted into the disc valve 54 from the lower surface side of the bottom piece 51, and connects the check valve 55 and the coil spring 56 around the protruding end of the bolt 57 protruding to the upper surface side of the bottom piece 51. The check valve 55 and the coil spring 56 are centered by the nut 58 and fastened by being screwed to the nut 58 at the projecting end of the bolt 57. The nut 58 includes a check valve 55 and a centering guide 58A for a coil spring 56 on the side that comes into contact with the upper surface of the bottom piece 51 (FIG. 4A). An end of the bolt 57 protruding from the upper surface of the nut 58 is formed as a caulking portion 59 to prevent the nut 58 from rotating.
[0021]
When the hydraulic shock absorber 10 is compressed, the oil in the piston-side damper chamber 29A flexes and opens the disc valve 54 through the push-side flow path 52, flows into the reservoir chamber 41, and generates a compression-side damping force. At the time of extension, the oil in the reservoir chamber 41 passes through the pull-side flow path 53 to deflect and open the check valve 55 and is guided to the piston-side damper chamber 29A.
[0022]
However, in the bottom valve device 40, as shown in FIG. 4, in the bottom piece 51 as a valve support for the disc valve 54 and the check valve 55, the push-side flow path 52 on the lower surface of the bottom piece 51 is formed. The annular seats 61 and 62 for detaching and seating the disk valve 54 are raised around the inside and outside, and the check valve 54 is placed around the inside and outside of the pull-side flow path 53 on the upper surface of the bottom piece 51. The annular seats 63 and 64 for taking off and sitting are raised.
[0023]
The bottom valve device 40 is configured such that while ensuring the durability of the seats 61 to 64, the sticking to the seats 61 to 64 when the valves 54 and 55 open and the seats 61 to 64 when the valves 54 and 55 close are performed. The following configuration is provided to prevent generation of abnormal noise such as a tapping sound. Since the sheets 61 to 64 have the same configuration, the sheet 64 will be described as a representative example thereof.
[0024]
As shown in FIG. 6, the sheet 64 (same for the sheets 61 to 63) has a reduced width gradually narrowing in the rising direction in a cross-sectional view rising from the surface of the bottom piece 51. A base portion 71 having a shape, a narrow valve contact surface 72 that contacts when the valve 55 (or 54) is seated, and a connection portion between the base portion 71 and the valve contact surface 72 (a connection portion on both sides of the valve contact surface 72). And a chamfered portion 73 to be provided.
[0025]
The seat 64 has an R shape (R chamfer) in the chamfered portion 73, and smoothly connects the base portion 71 and the valve contact surface 72. The width w of the valve contact surface 72 of the seat 64 is set in a range of 0.3 mm to 0.1 mm (FIG. 6B).
[0026]
The bottom piece 51 is formed of the sintered compact as described above, and the sheet 64 (the same is true for the sheets 61 to 63) is formed by the following procedure.
[0027]
(1) In the step of forming the bottom piece 51, the rough shape of the trapezoidal sheet 64 is formed. Thereafter, it is sintered and hardened.
[0028]
(2) In the step of correcting the bottom piece 51 (sizing step), a groove serving as an attenuation orifice is formed in the sheet 64. Simultaneously with the formation of the groove, the head of the trapezoidal sheet 64 is embossed with a straightening die, and the chamfered portion 73 is crushed to form the base 71, the valve contact surface 72, and the chamfered portion 73.
[0029]
(3) In the finishing step (polishing step) of the bottom piece 51, finish forming of the sheet 64 having the base 71, the valve contact surface 72, and the chamfered portion 73 is performed. This finishing step may not be necessary.
[0030]
In addition, the process of crushing the chamfered portion 73 by the straightening die and forming the base 71, the valve contact surface 72, and the chamfered portion 73 may be performed in the finishing process described in (3) above, not in the sizing process described in (2) above. good.
[0031]
According to the present embodiment, the following operations are provided.
(Action corresponding to claims 1 and 2)
{Circle around (1)} Since the seat 64 (same as the seats 61 to 63) is provided with a planar valve contact surface 72 and receives the load of the valve 55 (or 54) on the surface, the seat 64 is hit against the valve 55 to be strong and durable. Good nature. There is no unexpected gap between the seat 64 and the valve 55, and the damping characteristics can be stabilized.
[0032]
{Circle around (2)} The upper surface angle of the trapezoidal base 71, which is narrow in the rising direction of the seat 64, is chamfered in an R-shape, and the width of the valve contact surface 72 is reduced to, for example, 0.3 mm to 0.1 mm. I made it to width. Therefore, it is possible to prevent sticking of the valve 55 to the valve contact surface 72 of the seat 64 and generation of abnormal noise such as a tapping sound with the valve 55.
[0033]
(3) By forming the upper surface angle of the trapezoidal base 71 of the seat 64 as the R-shaped chamfered portion 73, it is possible to prevent unnecessary protrusions such as burrs on the valve contact surface 72.
[0034]
(Action corresponding to claim 3)
{Circle around (4)} The bottom piece 51 is made of a sintered material, and the chamfered portion 73 of the sheet 64 is formed by embossing the head of the sheet 64 at the time of forming the groove of the sheet 64 or at the time of final molding. Therefore, the chamfered portion 73 of the sheet 64 is crushed by the straightening mold, and the density of the head including the valve contact surface 72 and the chamfered portion 73 of the seat 64 increases, so that the hardness increases, and the durability and dimensional accuracy of the seat 64 improve.
[0035]
In the present invention, the chamfered portion provided on the sheet is not limited to the R-shape (FIG. 5A) as described above, but may be a tapered (linear) shape (FIG. 5B).
[0036]
Alternatively, the entire base, seat, and chamfer of the seat may be formed by cutting.
[0037]
As described above, the embodiment of the present invention has been described with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and there are design changes and the like that do not depart from the gist of the present invention. Are also included in the present invention. For example, the present invention can be applied to a seat provided on a piston as a valve support in a piston valve device.
[0038]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, in the valve apparatus of a hydraulic shock absorber, sticking of a valve and generation | occurrence | production of abnormal noise can be prevented, ensuring the durability of the seat to which a valve separates and sits.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing a hydraulic shock absorber.
FIG. 2 is an enlarged sectional view showing a piston valve device.
FIG. 3 is an enlarged sectional view showing a bottom valve device.
FIG. 4 is a cross-sectional view showing a bottom valve device.
FIG. 5 is a sectional view showing a sheet shape.
FIG. 6 is an enlarged sectional view showing the sheet of FIG. 4;
[Explanation of symbols]
10 hydraulic shock absorber 51 bottom piece (valve support)
52, 53 Channels 54, 55 Valves 61-64 Seat 71 Base 72 Valve contact surface 73 Chamfer

Claims (3)

バルブ支持体の流路周辺に環状シートを立上げ、該シートにバルブを離着座させる油圧緩衝器のバルブ装置において、
シートが、立上り方向に縮巾状をなす基部と、バルブが接触する狭巾のバルブ接触面と、基部とバルブ接触面のつながり部分に設ける面取り部とを備えることを特徴とする油圧緩衝器のバルブ装置。
In a valve device of a hydraulic shock absorber that erects an annular seat around a flow path of a valve support and detaches and seats a valve on the seat,
A hydraulic shock absorber, wherein the seat includes a base having a narrow width in the rising direction, a narrow valve contact surface with which the valve contacts, and a chamfer provided at a connection portion between the base and the valve contact surface. Valve device.
前記バルブ接触面の巾が0.3mm〜0.1mmである請求項1に記載の油圧緩衝器のバルブ装置。The valve device for a hydraulic shock absorber according to claim 1, wherein the width of the valve contact surface is 0.3 mm to 0.1 mm. 前記バルブ支持体が焼結材からなり、前記シートの面取り部が該シートの溝成形時又は最終成形時に、シートの頭部の型押しにて形成される請求項1又は2に記載の油圧緩衝器のバルブ装置。3. The hydraulic shock absorber according to claim 1, wherein the valve support is made of a sintered material, and the chamfered portion of the seat is formed by embossing the head of the seat at the time of forming a groove or final forming the seat. Vessel valve device.
JP2003028905A 2003-02-05 2003-02-05 Valve device of hydraulic shock absorber Pending JP2004239344A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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WO2014125974A1 (en) * 2013-02-15 2014-08-21 カヤバ工業株式会社 Solenoid valve
WO2014125991A1 (en) * 2013-02-15 2014-08-21 カヤバ工業株式会社 Solenoid valve
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Cited By (12)

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WO2014125974A1 (en) * 2013-02-15 2014-08-21 カヤバ工業株式会社 Solenoid valve
WO2014125991A1 (en) * 2013-02-15 2014-08-21 カヤバ工業株式会社 Solenoid valve
JP2014156883A (en) * 2013-02-15 2014-08-28 Kayaba Ind Co Ltd Solenoid valve
JP2014156884A (en) * 2013-02-15 2014-08-28 Kayaba Ind Co Ltd Solenoid valve
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US20160025176A1 (en) * 2013-02-15 2016-01-28 Kayaba Industry Co., Ltd. Solenoid valve
KR101756569B1 (en) * 2013-02-15 2017-07-10 케이와이비 가부시키가이샤 Solenoid valve
US10458506B2 (en) 2013-02-15 2019-10-29 Kyb Corporation Solenoid valve
US10495177B2 (en) 2013-02-15 2019-12-03 Kyb Corporation Solenoid valve
JP7144646B1 (en) * 2022-03-31 2022-09-29 日立Astemo株式会社 shock absorber piston, shock absorber
WO2023188285A1 (en) * 2022-03-31 2023-10-05 日立Astemo株式会社 Piston for buffer device and buffer device

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