JP2007046713A - Fixed constant velocity universal joint - Google Patents

Fixed constant velocity universal joint Download PDF

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JP2007046713A
JP2007046713A JP2005232141A JP2005232141A JP2007046713A JP 2007046713 A JP2007046713 A JP 2007046713A JP 2005232141 A JP2005232141 A JP 2005232141A JP 2005232141 A JP2005232141 A JP 2005232141A JP 2007046713 A JP2007046713 A JP 2007046713A
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case
press
constant velocity
universal joint
velocity universal
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Minoru Ishijima
実 石島
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NTN Corp
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NTN Corp
NTN Toyo Bearing Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a fixed constant velocity universal joint capable of surely applying proper pre-load without interfering with a function of a pressing member, reducing press-in load in press-fitting a case, and improving assembling performance. <P>SOLUTION: In this fixed constant velocity universal joint wherein an axial clearance between track grooves 14, 24 is filled by a pre-load application means having a pressing portion 52 applying elastic pressing force in the axial direction and a receiving portion 58 receiving pressing force from the pressing portion 52, the pre-load application means has the case 55 press-fitted to a case press-fitting hole 2a of an internal member, the pressing member 53 received in the case 55, and applying its tip portion projecting from a case opening portion as the pressing portion 52, and an elastic member 54 received in the case 55 and applying elastic pressing force to the pressing portion 52. A projecting piece 65 projecting in the outer diameter direction, and closely kept into contact with an inner peripheral face of the case press-fitting hole 2a to keep the case 55 in a press-fitted state, is mounted on a peripheral wall 59 of the case 55. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は固定型等速自在継手に関し、詳しくは、自動車のステアリング装置に組み込まれる固定型等速自在継手に関する。   The present invention relates to a fixed type constant velocity universal joint, and more particularly to a fixed type constant velocity universal joint incorporated in a steering device of an automobile.

等速自在継手は、入出力軸間の角度変位のみを許容する固定型と、角度変位および軸方向変位を許容する摺動型に大別され、それぞれ用途・使用条件等に応じて機種選定される。固定型等速自在継手としては、ツェッパ型（以下、「ＢＪ」と称す）やアンダーカットフリー型（以下、「ＵＪ」と称す）が広く知られている。   Constant velocity universal joints are broadly classified into fixed types that allow only angular displacement between the input and output shafts, and sliding types that allow angular displacement and axial displacement. Each model is selected according to the application and usage conditions. The As a fixed type constant velocity universal joint, a Rzeppa type (hereinafter referred to as “BJ”) and an undercut free type (hereinafter referred to as “UJ”) are widely known.

ＢＪおよびＵＪのいずれも、内周に複数の曲線状のトラック溝を有する外輪と、外周に複数の曲線状のトラック溝を有する内輪と、外輪のトラック溝と内輪のトラック溝との間に組み込まれたボールと、そのボールを保持する保持器とで構成される。外輪のトラック溝中心は外輪内球面中心に対して外輪開口側、また、内輪のトラック溝中心は内輪外球面中心に対して外輪奥側に位置し、軸方向で互いに逆方向に等距離だけオフセットしている。これにより、外輪のトラック溝と内輪のトラック溝とで構成されるボールトラックは、外輪の開口側に向けて拡開する楔形となっている。ＢＪでは各トラック溝の全域が曲線状になっているが、ＵＪでは各トラック溝の一方の端部が軸線と平行なストレート状になっている。   Both BJ and UJ are incorporated between an outer ring having a plurality of curved track grooves on the inner periphery, an inner ring having a plurality of curved track grooves on the outer periphery, and a track groove of the outer ring and a track groove of the inner ring. And a cage for holding the ball. The outer ring track groove center is located on the outer ring opening side with respect to the outer ring inner spherical center, and the inner ring track groove center is located on the outer ring rear side with respect to the inner ring outer spherical center, and is offset by an equal distance in the opposite direction in the axial direction. is doing. Thereby, the ball track constituted by the track groove of the outer ring and the track groove of the inner ring has a wedge shape that expands toward the opening side of the outer ring. In BJ, the entire area of each track groove is curved, whereas in UJ, one end of each track groove is in a straight shape parallel to the axis.

一般的に自動車のステアリング装置に組み込まれる軸継手にはカルダンジョイントを２個以上使用している。このジョイントは、単体では不等速なことから、等速性を確保するために互いの変動成分を打ち消し合うよう配置し使用している。このため車両の設計自由度が損なわれるという問題がある。任意の角度で等速性が確保できる等速自在継手をステアリング用軸継手として用いることで、車両の設計自由度が増すことは可能であるが、等速自在継手は回転方向ガタが大きいため、車両直進付近のステアリング操作感の悪化や、異音の原因となることが懸念される。   Generally, two or more cardan joints are used for a shaft joint incorporated in an automobile steering device. Since this joint is not uniform at a single unit, it is arranged and used so as to cancel each other's fluctuation components in order to ensure constant velocity. For this reason, there exists a problem that the design freedom of a vehicle is impaired. By using a constant velocity universal joint that can ensure constant velocity at an arbitrary angle as a steering shaft joint, it is possible to increase the design freedom of the vehicle, but the constant velocity universal joint has a large amount of play in the rotation direction, There is a concern that the steering operation feeling near the vehicle will be deteriorated and abnormal noise may be caused.

固定型等速自在継手においては、機能及び加工面から、一般的に外輪のトラック溝と内輪のトラック溝間にはボールを介してすきまがあり、また、外輪の内球面と保持器の外球面、内輪の外球面と保持器の内球面にもすきまが存在する。これらすきまは、継手の中立状態で内輪または外輪のどちらか一方を固定して他方をラジアル方向またはアキシャル方向に移動させたときの移動量をいい、移動させる方向によって、ラジアルすきま、アキシャルすきまのように呼ばれる。これらすきまは、内・外輪間の円周方向のガタツキ（回転バックラッシュ）に大きく影響を与え、特にトラック溝すきまが大きい程回転バックラッシュも大きくなる。   In the fixed type constant velocity universal joint, there is generally a clearance between the outer ring track groove and the inner ring track groove through a ball in terms of function and processing surface, and the outer ring inner spherical surface and the cage outer spherical surface There is also a clearance between the outer spherical surface of the inner ring and the inner spherical surface of the cage. These clearances refer to the amount of movement when either the inner ring or outer ring is fixed and the other is moved in the radial or axial direction in the neutral state of the joint. Depending on the direction of movement, radial clearance, axial clearance, etc. Called. These clearances greatly affect the circumferential play (rotational backlash) between the inner and outer rings, and the larger the track groove clearance, the greater the rotational backlash.

そこで、等速自在継手内部に与圧手段を設けてトラック溝すきまを詰めることが提案されている（例えば、特許文献１参照）。特許文献１に記載された発明には、図９に示すように、弾性的な押圧力を軸方向に作用させる押圧部１０７を内方部材側に設けると共に、その押圧部１０７からの押圧力を受ける受け部１０８を保持器１０５側に設けた予圧手段が開示されている。   Thus, it has been proposed to close the track groove clearance by providing a pressurizing means inside the constant velocity universal joint (see, for example, Patent Document 1). In the invention described in Patent Document 1, as shown in FIG. 9, a pressing portion 107 for applying an elastic pressing force in the axial direction is provided on the inner member side, and the pressing force from the pressing portion 107 is applied. A preloading means in which a receiving part 108 is provided on the cage 105 side is disclosed.

特許文献１に記載の固定型等速自在継手は、トラック溝１０１を有する外輪１００と、トラック溝１０３を有する内輪１０２と、外輪１００のトラック溝１０１と内輪１０２のトラック溝１０３との間に組み込まれたボール１０４と、そのボール１０４を保持する保持器１０５等で構成される。そして、その予圧手段の一形態として、内方部材を構成する内輪１０２の内周に結合されたシャフト１１０の軸端に円筒状の収容部材（ケース）１１１が埋め込まれており、このケース１１１の内部に押圧部材１１２および弾性部材１１３が収容されている。押圧部材１１２の頭部の端面は凸球面状に形成され、この凸球面部分が弾性的な押圧力を軸方向に作用させる前記押圧部１０７として機能する。一方、保持器１０５の端部には、シャフト１１０と対向する凹球面状の球面部を有する受け部材１１４が取付けられ、この受け部材１１４の凹球面部分が押圧部１０７からの押圧力を受ける前記受け部１０８として機能する。
特開２００３−１３００８２号公報 The fixed type constant velocity universal joint described in Patent Document 1 is incorporated between the outer ring 100 having the track groove 101, the inner ring 102 having the track groove 103, and the track groove 101 of the outer ring 100 and the track groove 103 of the inner ring 102. And a cage 105 for holding the ball 104. As one form of the preload means, a cylindrical housing member (case) 111 is embedded at the shaft end of the shaft 110 coupled to the inner periphery of the inner ring 102 constituting the inner member. A pressing member 112 and an elastic member 113 are housed inside. The end surface of the head of the pressing member 112 is formed in a convex spherical shape, and this convex spherical portion functions as the pressing portion 107 that applies an elastic pressing force in the axial direction. On the other hand, a receiving member 114 having a concave spherical surface facing the shaft 110 is attached to the end of the cage 105, and the concave spherical portion of the receiving member 114 receives the pressing force from the pressing portion 107. It functions as the receiving unit 108.
Japanese Patent Laid-Open No. 2003-130082

前述のような構造により、トラック溝すきまを詰めることができるようになって、回転バックラッシュを防止するようにしているが、円筒状の収容部材１１１をシャフト１１０の軸端に強固に埋め込むためには、その収容部材１１１をシャフト１１０内に圧入する必要がある。しかしながら、収容部材１１１をシャフト１１０内に圧入すると、押圧部材１１２が配された収容部材１１１の開口部近傍がわずかに縮径することが考えられる。この収容部材１１１の開口部近傍では、受け部材１１２の球面部に当接する押圧部材１１２が動作する部位であり、この部位で収容部材１１１が縮径していると、押圧部材１１２の動作を阻害するおそれがあり、適正な予圧を付与することが困難になることが考えられる。   With the structure as described above, it is possible to close the track groove clearance and prevent rotational backlash. In order to firmly embed the cylindrical housing member 111 in the shaft end of the shaft 110, Needs to press-fit the accommodating member 111 into the shaft 110. However, it is conceivable that when the accommodating member 111 is press-fitted into the shaft 110, the vicinity of the opening of the accommodating member 111 in which the pressing member 112 is disposed is slightly reduced in diameter. In the vicinity of the opening of the housing member 111, the pressing member 112 that abuts the spherical surface of the receiving member 112 operates. When the housing member 111 is reduced in diameter at this site, the operation of the pressing member 112 is obstructed. It may be difficult to apply an appropriate preload.

本発明は、上記課題に鑑みて、押圧部材の機能を阻害することなく、適正な予圧を確実に付与することができ、しかも、ケース圧入時の圧入荷重を低減できて、組立性の向上を図ることができる固定型等速自在継手を提供する。   In view of the above problems, the present invention can reliably apply an appropriate preload without hindering the function of the pressing member, and can reduce the press-fitting load at the time of press-fitting the case, thereby improving the assemblability. Provided is a fixed type constant velocity universal joint that can be realized.

本発明の固定型等速自在継手は、複数のトラック溝が形成された球状内面を備えた外方部材と、複数のトラック溝が形成された球状外面を備えた内方部材と、外方部材のトラック溝と内方部材のトラック溝の協働で形成された楔形のボールトラックに配置したボールと、外方部材の球状内面と内方部材の球状外面との間に配置され、ボールを保持する保持器とを備え、弾性的な押圧力を軸方向に作用させる押圧部と、押圧部からの押圧力を受ける受け部とを有する与圧付与手段にて、トラック溝のアキシャルすきまを詰める固定型等速自在継手において、前記与圧付与手段は、前記内方部材のケース圧入孔に圧入されるケースと、ケースに収容されてケース開口部から突出した先端部が前記押圧部となる押圧部材と、ケースに収容されて前記押圧部に弾性的な押圧力を付与する弾性部材とを有し、前記ケースの周壁に、外径方向に突出してケース圧入孔の内周面に圧接しケースが圧入状態となる突起片を設けたものである。   A fixed type constant velocity universal joint according to the present invention includes an outer member having a spherical inner surface in which a plurality of track grooves are formed, an inner member having a spherical outer surface in which a plurality of track grooves are formed, and an outer member. The ball is disposed between the spherical inner surface of the outer member and the spherical outer surface of the inner member by holding the ball disposed on the wedge-shaped ball track formed by the cooperation of the track groove of the inner member and the track groove of the inner member, and holds the ball And fixing the axial groove of the track groove with a pressurizing means having a pressing portion for applying an elastic pressing force in the axial direction and a receiving portion for receiving the pressing force from the pressing portion. In the constant velocity universal joint, the pressurizing means includes a case that is press-fitted into a case press-fitting hole of the inner member, and a pressing member that is housed in the case and that protrudes from the case opening serves as the pressing portion. And in the case An elastic member that applies an elastic pressing force to the pressure portion, and a protruding piece that protrudes in the outer diameter direction and press-contacts the inner peripheral surface of the case press-fitting hole is provided on the peripheral wall of the case. It is a thing.

ケースに収容されている弾性部材にて、押圧部に弾性的な押圧力を付与することができ、トラック溝のアキシャルすきまを詰めることができる。これにより、回転バックラッシュが防止される。突起片がケース圧入孔の内周面に圧接しケースが圧入状態となるので、ケースの内方部材への圧入状態が安定してケースの抜けが防止される。しかも、この圧入状態では、突起片のみがケース圧入孔の内周面に圧接されるので、ケース開口部の孔径が縮小（縮径）するのが防止される。   With the elastic member accommodated in the case, an elastic pressing force can be applied to the pressing portion, and the axial clearance of the track groove can be reduced. This prevents rotational backlash. Since the protruding piece is pressed against the inner peripheral surface of the case press-fitting hole and the case is in a press-fitted state, the press-fitted state to the inner member of the case is stabilized and the case is prevented from coming off. In addition, in this press-fitted state, only the projecting pieces are pressed against the inner peripheral surface of the case press-fitting hole, so that the hole diameter of the case opening is prevented from being reduced (reduced).

前記突起片は、ケースの周壁の一部を反圧入方向に向かって外径方向に順次傾斜するように起した傾斜片とすることが可能である。この場合、ケースをケース圧入孔に挿入する際に、突起片がケース圧入孔の内周面に引っ掛ることなく滑らかに挿入して行くことができる。   The protruding piece may be an inclined piece that is raised so that a part of the peripheral wall of the case is sequentially inclined in the outer diameter direction toward the counter press-fitting direction. In this case, when the case is inserted into the case press-fitting hole, the protruding piece can be smoothly inserted without being caught on the inner peripheral surface of the case press-fitting hole.

前記突起片が周方向に沿って複数個配置されたり、軸方向に沿って複数個配置されたりする。これによって、ケースの圧入状態が一層安定する。   A plurality of the projecting pieces may be arranged along the circumferential direction, or a plurality of the protruding pieces may be arranged along the axial direction. As a result, the press-fitted state of the case is further stabilized.

本発明の固定型等速自在継手では、回転バックラッシュを防止できるので、自動車のステアリング装置に組み込むのが好ましい。   In the fixed type constant velocity universal joint according to the present invention, it is possible to prevent the rotation backlash, so that it is preferably incorporated in the steering device of the automobile.

本発明は、トラック溝のアキシャルすきまを詰めることができ、回転バックラッシュが防止される。ケースの内方部材への圧入状態が安定してケースの抜けが防止され、回転バックラッシュの防止作用を長期にわたって発揮することができる。しかも、突起片が圧接した圧入状態では、ケース開口部の孔径が縮小（縮径）しないので、ケース内に収容される押圧部材はその動作が阻害されず、しかも弾性部材も安定して押圧部に押圧力を付与することができる。このため、与圧付与手段による回転バックラッシュの防止作用の信頼性が向上する。特に、突起片をケース圧入孔の内周面に圧接させればよいので、ケース外面全体をケース圧入孔の内周面に圧接させる必要がなく、圧入荷重の低減を図ることができ、この固定型等速自在継手の組立作業性の向上を図ることができる。   According to the present invention, the axial clearance of the track groove can be reduced, and the rotation backlash is prevented. The press-fitted state into the inner member of the case is stabilized and the case is prevented from coming off, and the effect of preventing the rotation backlash can be exhibited over a long period of time. In addition, in the press-fitted state where the projecting pieces are pressed into contact with each other, the hole diameter of the case opening is not reduced (reduced), so that the operation of the pressing member accommodated in the case is not hindered, and the elastic member is also stably pressed. A pressing force can be applied to the. For this reason, the reliability of the action of preventing the rotation backlash by the pressurizing means is improved. In particular, since the protruding piece only needs to be pressed against the inner peripheral surface of the case press-fitting hole, it is not necessary to press the entire outer surface of the case against the inner peripheral surface of the case press-fitting hole, so that the press-fitting load can be reduced and fixed It is possible to improve the assembly workability of the mold constant velocity universal joint.

ケースをケース圧入孔に挿入する際に、突起片がケース圧入孔の内周面に引っ掛ることなく滑らかに挿入して行くことができ、ケース圧入（挿入）作業を一層行ない易くできる。また、圧入状態では、ケースに対して反圧入方向の抜け力が作用しても、突起片の外端部がケース圧入孔の内周面に引っ掛ることになって、抜けを有効に防止できる。突起片はケースの周壁の一部を起せばよいので、突起片形成作業（突起片加工作業）の簡略化を図ることができ、生産性の向上を達成できる。   When the case is inserted into the case press-fitting hole, the protruding piece can be smoothly inserted without being caught on the inner peripheral surface of the case press-fitting hole, and the case press-fitting (insertion) operation can be further facilitated. Further, in the press-fitted state, even if a pulling force in the counter press-fitting direction acts on the case, the outer end portion of the protruding piece is caught by the inner peripheral surface of the case press-fitting hole, so that the slipping can be effectively prevented. . Since the protruding piece only has to be part of the peripheral wall of the case, the protruding piece forming operation (projecting piece processing operation) can be simplified, and the improvement in productivity can be achieved.

突起片を複数個設けることによって、ケースの圧入状態が一層安定し、ケース抜けを確実に防止することができる。   By providing a plurality of protruding pieces, the press-fitted state of the case is further stabilized, and the case can be reliably prevented from coming off.

本発明の固定型等速自在継手を自動車のステアリング装置に組み込めば、等速自在継手内のトラック溝すきまを詰めて回転バックラッシュを防止する上で、より一層顕著な効果を発揮する。   If the fixed type constant velocity universal joint according to the present invention is incorporated in a steering apparatus for an automobile, the track groove clearance in the constant velocity universal joint is reduced to prevent the rotation backlash, and thus a more remarkable effect is exhibited.

以下本発明の実施の形態を図１〜図８を参考に説明する。以下の実施形態では、ステアリング用固定型等速自在継手の一種であるツェッパ型（ＢＪ）に適用した場合を例示するが、本発明はこれに限定されることなく、アンダーカットフリー型（ＵＪ）にも適用可能である。また、本発明の固定型等速自在継手は、ステアリング用に限らず、ドライブシャフト用あるいはプロペラシャフト用としても使用することが可能である。   Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the following embodiments, a case where the present invention is applied to a Rzeppa type (BJ) which is a kind of a fixed type constant velocity universal joint for steering is illustrated, but the present invention is not limited to this, and an undercut free type (UJ) It is also applicable to. Further, the fixed type constant velocity universal joint of the present invention is not limited to steering, but can be used for a drive shaft or a propeller shaft.

まず、固定型等速自在継手が組み込まれるステアリング装置を簡単に説明する。ステアリング装置は、図８（ａ）（ｂ）（ｃ）に示すようにステアリングホイール６の回転運動を、一または複数のステアリングシャフト２からなるステアリングコラムを介してステアリングギヤ８に伝達することにより、タイロッド９の往復運動に変換するようにしたものである。車載スペース等との兼ね合いでステアリングシャフト２を一直線に配置できない場合は、ステアリングシャフト２間に一または複数の軸継手１を配置し、ステアリングシャフト２を屈曲させた状態でもステアリングギヤ８に正確な回転運動を伝達できるようにしている。この軸継手１に固定型等速自在継手を使用する。図８（ｂ）における符号αは継手の折り曲げ角度を表しており、折り曲げ角度αが３０°を越える大角度も設定可能である。   First, a steering device incorporating a fixed type constant velocity universal joint will be briefly described. As shown in FIGS. 8A, 8B, and 8C, the steering device transmits the rotational motion of the steering wheel 6 to the steering gear 8 through a steering column including one or a plurality of steering shafts 2. This is converted to the reciprocating motion of the tie rod 9. If the steering shaft 2 cannot be arranged in a straight line in consideration of the space on the vehicle, etc., one or more shaft couplings 1 are arranged between the steering shafts 2 so that the steering gear 8 can be rotated accurately even when the steering shaft 2 is bent. It is possible to transmit exercise. A fixed type constant velocity universal joint is used for the shaft joint 1. The symbol α in FIG. 8B represents the bending angle of the joint, and a large angle where the bending angle α exceeds 30 ° can be set.

次に固定型等速自在継手について説明する。この実施形態の固定型等速自在継手１はツェッパ型ジョイント（ＢＪ）で、図１に示すように外方部材としての外輪１０と、内方部材を構成する内輪２０およびシャフト２と、トルクを伝達するボール３０と、ボール３０を支持する保持器４０を主要な構成要素として成り立っている。外輪１０は入力軸または出力軸と接続し、内輪２０は出力軸または入力軸と接続する。この実施形態では、内輪２０の内周にセレーションやスプライン等のトルク伝達手段を介してシャフト２を結合することにより、内方部材を構成している。   Next, the fixed type constant velocity universal joint will be described. The fixed type constant velocity universal joint 1 of this embodiment is a Rzeppa type joint (BJ). As shown in FIG. 1, an outer ring 10 as an outer member, an inner ring 20 and a shaft 2 constituting the inner member, and torque are supplied. The transmitting ball 30 and the retainer 40 that supports the ball 30 are constituted as main components. The outer ring 10 is connected to the input shaft or the output shaft, and the inner ring 20 is connected to the output shaft or the input shaft. In this embodiment, the inner member is configured by coupling the shaft 2 to the inner circumference of the inner ring 20 via torque transmission means such as serrations and splines.

前述の外輪１０は一端にて開口したカップ状で、球状内面１２の円周方向等配位置に、軸方向に延びるトラック溝１４が形成されている。また、内輪２０は、球状外面２２の円周方向等配位置に、軸方向に延びるトラック溝２４が形成されている。外輪１０のトラック溝１４と内輪２０のトラック溝２４とは対をなして軸方向の一方から他方へ楔状に拡がるボールトラックを形成し、各ボールトラックに一個のボール３０がそれぞれ組み込んである。保持器４０は外輪１０の球状内面１２と内輪２０の球状外面２２との間に摺動自在に介在し、各ボール３０は保持器４０のポケット４６に収容されて円周方向で等間隔に保持されている。   The outer ring 10 has a cup shape opened at one end, and a track groove 14 extending in the axial direction is formed at a circumferentially equidistant position of the spherical inner surface 12. Further, the inner ring 20 is formed with a track groove 24 extending in the axial direction at equal circumferential positions on the spherical outer surface 22. The track groove 14 of the outer ring 10 and the track groove 24 of the inner ring 20 are paired to form a ball track extending in a wedge shape from one axial direction to the other, and one ball 30 is incorporated in each ball track. The cage 40 is slidably interposed between the spherical inner surface 12 of the outer ring 10 and the spherical outer surface 22 of the inner ring 20, and each ball 30 is accommodated in a pocket 46 of the cage 40 and is held at equal intervals in the circumferential direction. Has been.

保持器４０の外周面４２は外輪１０の球状内面１２と球面接触し、保持器４０の内周面４４は内輪２０の球状外面２２と球面嵌合している。そして、外輪１０の球状内面１２の中心と、内輪２０の球状外面２２の中心は継手中心Ｏと一致している。これに対して、外輪１０のトラック溝１４の中心Ｏ1と、内輪２０のトラック溝２４の中心Ｏ2は、軸方向で、互いに逆方向に等距離だけオフセットしている。このため、一対のトラック溝１４、２４により形成されるボールトラックは、外輪１０の奥部側から開口側に向かって拡がる楔状を呈している。 The outer circumferential surface 42 of the cage 40 is in spherical contact with the spherical inner surface 12 of the outer ring 10, and the inner circumferential surface 44 of the cage 40 is spherically fitted to the spherical outer surface 22 of the inner ring 20. The center of the spherical inner surface 12 of the outer ring 10 and the center of the spherical outer surface 22 of the inner ring 20 coincide with the joint center O. On the other hand, the center O 1 of the track groove 14 of the outer ring 10 and the center O 2 of the track groove 24 of the inner ring 20 are offset by an equal distance in the opposite directions in the axial direction. For this reason, the ball track formed by the pair of track grooves 14 and 24 has a wedge shape that expands from the rear side of the outer ring 10 toward the opening side.

この固定型等速自在継手において、図２に示すように外輪１０と内輪２０とがどのような折り曲げ角、つまり作動角θをとっても、保持器４０に案内されたボール３０は常に作動角θの二等分線に垂直な平面内に維持され、継手の等速性が確保される。   In this fixed type constant velocity universal joint, as shown in FIG. 2, the ball 30 guided by the cage 40 always has an operating angle θ regardless of the bending angle, that is, the operating angle θ between the outer ring 10 and the inner ring 20. It is maintained in a plane perpendicular to the bisector, ensuring constant velocity of the joint.

この固定型等速自在継手は、トラック溝１４、２４のラジアルすきまを詰める与圧付与手段が設けられている。与圧付与手段は、弾性的な押圧力を軸方向に作用させる押圧部５２と、押圧部からの押圧力を受ける受け部５８とを有する。すなわち、シャフト２の軸端に、この与圧付与手段の要部を構成するプランジャユニット５０を取付けている。   This fixed type constant velocity universal joint is provided with a pressure applying means for closing the radial clearance of the track grooves 14 and 24. The pressurizing means has a pressing portion 52 that applies an elastic pressing force in the axial direction and a receiving portion 58 that receives the pressing force from the pressing portion. That is, the plunger unit 50 constituting the main part of the pressurizing means is attached to the shaft end of the shaft 2.

プランジャユニット５０は、図４に示すように、先端部が前記押圧部５２となるボールからなる押圧部材５３と、圧縮コイルバネからなる弾性部材５４と、押圧部材５３と弾性部材５４とを収容するケース５５とからなるアッセンブリ体である。   As shown in FIG. 4, the plunger unit 50 houses a pressing member 53 made of a ball whose tip is the pressing portion 52, an elastic member 54 made of a compression coil spring, and the pressing member 53 and the elastic member 54. 55 is an assembly body.

ケース５５は、円筒状の周壁５９と底壁６０とを有する有底筒状体からなる。底壁６０はその中央部に内部側へ凹む凹部６１が設けられ、これによって、底壁６０の内面の外周側に環状の凹溝６２が形成されている。また、ケース５５の開口縁部には、内径側に突出する係止部６３と、外径方向に突出するフランジ部６４とが形成されている。   The case 55 is formed of a bottomed cylindrical body having a cylindrical peripheral wall 59 and a bottom wall 60. The bottom wall 60 is provided with a recessed portion 61 that is recessed inwardly at the center thereof, whereby an annular recessed groove 62 is formed on the outer peripheral side of the inner surface of the bottom wall 60. In addition, a locking portion 63 that protrudes toward the inner diameter side and a flange portion 64 that protrudes in the outer diameter direction are formed at the opening edge of the case 55.

ボールからなる押圧部材５３は、その直径（外径）をケース５５の周壁５９の内径と略同一又は周壁５９の内径よりも僅かに小さくしている。係止部６３の内径を押圧部材５３の外径よりも小さくしている。   The pressing member 53 made of a ball has a diameter (outer diameter) substantially the same as the inner diameter of the peripheral wall 59 of the case 55 or slightly smaller than the inner diameter of the peripheral wall 59. The inner diameter of the locking part 63 is made smaller than the outer diameter of the pressing member 53.

前記弾性部材５４は、押圧部材５３と底壁６０との間においてケース５５内に収容される。弾性部材５４は、開口部側の端部５４ａに押圧部材５３の一部が嵌入し、その反開口部側の端部５４ｂが前記凹溝６２に嵌合している。これによって、弾性部材５４は押圧部材５３を軸方向に矢印Ａ方向に弾性的に押圧している。前記係止部６３は押圧部材５３のケース５５からの飛び出しを規制している。   The elastic member 54 is accommodated in the case 55 between the pressing member 53 and the bottom wall 60. In the elastic member 54, a part of the pressing member 53 is fitted into the end 54 a on the opening side, and the end 54 b on the side opposite to the opening is fitted in the concave groove 62. Accordingly, the elastic member 54 elastically presses the pressing member 53 in the direction of the arrow A in the axial direction. The locking portion 63 restricts the pressing member 53 from protruding from the case 55.

周壁５９には、図４〜図６に示すように、周方向に沿って約１２０度ピッチに３個の突起片６５が設けられている。突起片６５は、ケース５５の周壁５９の一部を反圧入方向（前記矢印Ａ方向）に向かって外径方向に順次傾斜するように起した傾斜片である。具体的には、周壁５９の一部に略コの字状のスリット孔６６を形成し、このスリット孔６６に囲まれた部位を、反開口部側を起点として外径方向に起したものである。なお、スリット孔６６としては半円、半楕円状またはＶ字状であってもよい。   As shown in FIGS. 4 to 6, the peripheral wall 59 is provided with three protruding pieces 65 at a pitch of about 120 degrees along the circumferential direction. The protruding piece 65 is an inclined piece that is raised so that a part of the peripheral wall 59 of the case 55 is sequentially inclined in the outer diameter direction toward the counter press-fitting direction (the arrow A direction). Specifically, a substantially U-shaped slit hole 66 is formed in a part of the peripheral wall 59, and a portion surrounded by the slit hole 66 is raised in the outer diameter direction starting from the side opposite to the opening. is there. The slit hole 66 may be semicircular, semielliptical, or V-shaped.

前記のように構成されたプランジャユニット５０は、図１等に示すように、シャフト２の軸端に形成されたケース圧入孔（凹陥部）２ａに圧入される。ケース５５の周壁５９の外径がケース圧入孔２ａの内径と略同一とされ、突起片６５の外周縁がケース圧入孔２ａの内径よりも僅かに大きくされている。   The plunger unit 50 configured as described above is press-fitted into a case press-fitting hole (concave portion) 2a formed at the shaft end of the shaft 2 as shown in FIG. The outer diameter of the peripheral wall 59 of the case 55 is substantially the same as the inner diameter of the case press-fitting hole 2a, and the outer peripheral edge of the projection piece 65 is slightly larger than the inner diameter of the case press-fitting hole 2a.

ケース５５をケース圧入孔２ａに圧入するには、図７の矢印Ｂで示す圧入方向に沿って、ケース５５をケース圧入孔２ａに挿入していく。この場合、突起片６５は、反圧入方向に向かって外径方向に順次傾斜するように起した傾斜片であるので、突起片６５がケース圧入孔２ａの内周面６７に引っ掛ることなく滑らかに挿入して行くことができる。そして、突起片６５がケース圧入孔２ａの内周面６７に圧接して、ケース圧入状態が形成される。この圧入状態では、周壁５９がケース圧入孔２ａに対して圧接せずに突起片６５のみが圧接するので、ケース開口部の孔径が縮小（縮径）するのが防止される。また、ケース５５のフランジ部６４がシャフト２の軸端に当接する。これによって、シャフト２の軸端面を基準としてプランジャユニット５０の位置決めがなされる。   In order to press-fit the case 55 into the case press-fitting hole 2a, the case 55 is inserted into the case press-fitting hole 2a along the press-fitting direction indicated by the arrow B in FIG. In this case, since the protruding piece 65 is an inclined piece that is sequentially inclined in the outer diameter direction toward the counter press-fitting direction, the protruding piece 65 is smooth without being caught on the inner peripheral surface 67 of the case press-fitting hole 2a. You can go into the insert. And the protrusion piece 65 press-contacts to the internal peripheral surface 67 of case press-fit hole 2a, and a case press-fit state is formed. In this press-fitted state, the peripheral wall 59 is not pressed against the case press-fitting hole 2a, and only the protruding piece 65 is press-fitted, so that the hole diameter of the case opening is prevented from being reduced (reduced). Further, the flange portion 64 of the case 55 contacts the shaft end of the shaft 2. As a result, the plunger unit 50 is positioned with reference to the shaft end surface of the shaft 2.

図１等に示すように、保持器４０の外輪１０の奥側端部には受け部材５６を取り付けている。この受け部材５６は、保持器４０の端部開口を覆う蓋状をなし、部分球面状の球面部５６ａとその外周に環状に形成された取付け部５６ｂとで構成される。球面部５６ａの内面（シャフト２と対向する面）は凹球面で、この凹球面は押圧部５２からの押圧力を受ける受け部５８として機能する。取付け部５６ｂは、保持器４０の端部に圧入、溶接等の適宜の手段で固定されている。   As shown in FIG. 1 and the like, a receiving member 56 is attached to the back end of the outer ring 10 of the cage 40. The receiving member 56 has a lid shape that covers the end opening of the cage 40, and includes a spherical portion 56a having a partially spherical shape and an attachment portion 56b that is formed annularly on the outer periphery thereof. The inner surface (the surface facing the shaft 2) of the spherical portion 56 a is a concave spherical surface, and this concave spherical surface functions as a receiving portion 58 that receives the pressing force from the pressing portion 52. The attachment portion 56b is fixed to the end portion of the cage 40 by appropriate means such as press fitting or welding.

この等速自在継手のシャフト２が作動角をとった際に、プランジャユニット５０の押圧部５２と受け部材５６の受け部５８間をスムーズに摺動させるため、図３に示すように凹球面状の受け部５８の内径寸法Ｒｏは、押圧部５２を有するボール５３の外径寸法ｒ（図１参照）よりも大きくする（Ｒｏ＞ｒ）。また、作動角θ（図２参照）をとった際の受け部材５６と内輪２０との干渉を防止するため、受け部５８の内径寸法Ｒｏは、内輪２０の球状外面２２の外径寸法Ｒｉよりも大きくする（Ｒｏ＞Ｒｉ）。   When the shaft 2 of this constant velocity universal joint takes an operating angle, a concave spherical surface is formed as shown in FIG. 3 in order to smoothly slide between the pressing portion 52 of the plunger unit 50 and the receiving portion 58 of the receiving member 56. The inner diameter Ro of the receiving portion 58 is larger than the outer diameter r (see FIG. 1) of the ball 53 having the pressing portion 52 (Ro> r). Further, in order to prevent interference between the receiving member 56 and the inner ring 20 when the operating angle θ (see FIG. 2) is taken, the inner diameter dimension Ro of the receiving part 58 is larger than the outer diameter dimension Ri of the spherical outer surface 22 of the inner ring 20. (Ro> Ri).

以上の構成において、シャフト２のセレーション軸部と内輪２０をセレーション結合し、止め輪４を装着して両者が完全に結合されると、プランジャユニット５０の押圧部５２と受け部材５６の受け部５８とが互いに当接し、押圧部材（ボール）５３が退入して弾性部材（圧縮コイルばね）５４が圧縮される。すなわち、等速自在継手の各構成部材を組み付けた状態で、プランジャユニット５０の押圧部５２と受け部材５６の受け部５８とが互いに当接し、ボール５３が圧縮コイルばね５４の弾性力に抗して退入動作し、そのプランジャユニット５０の押圧部５２が適正な押圧力でもって受け部５８を押圧して予圧を付与する。   In the above configuration, when the serration shaft portion of the shaft 2 and the inner ring 20 are serration-coupled and the retaining ring 4 is attached and the two are completely coupled, the pressing portion 52 of the plunger unit 50 and the receiving portion 58 of the receiving member 56 are combined. Are in contact with each other, the pressing member (ball) 53 is retracted, and the elastic member (compression coil spring) 54 is compressed. That is, in a state where the constituent members of the constant velocity universal joint are assembled, the pressing portion 52 of the plunger unit 50 and the receiving portion 58 of the receiving member 56 come into contact with each other, and the ball 53 resists the elastic force of the compression coil spring 54. Then, the pressing portion 52 of the plunger unit 50 presses the receiving portion 58 with an appropriate pressing force to apply a preload.

このため、シャフト２と一体化された内輪２０が、弾性力により外輪１０の開口側に軸方向変位し、この変位によりトラック溝１４、２４に配置されたボール３０とトラック溝１４、２４のすきまが縮小されるため、トラック溝１４、２４のアキシャルすきまが詰められる。   For this reason, the inner ring 20 integrated with the shaft 2 is axially displaced toward the opening side of the outer ring 10 by the elastic force, and the clearance between the balls 30 and the track grooves 14 and 24 disposed in the track grooves 14 and 24 by this displacement. Is reduced, the axial clearances of the track grooves 14 and 24 are filled.

このように、トラック溝１４、２４のアキシャルすきまを詰めることができ、回転バックラッシュが防止される。突起片６５がケース圧入孔２ａの内周面６７に圧接しケース５５が圧入状態となるので、ケース５５の内方部材への圧入状態が安定してケース５５の抜けが防止される。しかも、圧入状態ではケース開口部の孔径が縮小（縮径）しないので、ケース５５内に収容される押圧部材５３はその動作が阻害されず、安定して押圧部５２に押圧力を付与することができ、この与圧付与手段による回転バックラッシュの防止作用の信頼性が向上する。特に、突起片６５をケース圧入孔２ａに圧接させればよいので、ケース外面全体を圧接させる必要がなく、圧入荷重の低減を図ることができ、この固定型等速自在継手の組立作業性の向上を図ることができる。   In this way, the axial clearance of the track grooves 14 and 24 can be reduced, and rotational backlash is prevented. Since the protruding piece 65 is pressed against the inner peripheral surface 67 of the case press-fitting hole 2a and the case 55 is in a press-fitted state, the press-fitted state of the case 55 into the inner member is stabilized and the case 55 is prevented from being pulled out. Moreover, since the hole diameter of the case opening is not reduced (reduced) in the press-fitted state, the operation of the pressing member 53 accommodated in the case 55 is not hindered, and the pressing force can be stably applied to the pressing portion 52. Thus, the reliability of the action of preventing the rotation backlash by the pressurizing means is improved. In particular, since the protruding piece 65 only needs to be pressed into the case press-fitting hole 2a, it is not necessary to press the entire outer surface of the case, and the press-fitting load can be reduced, and the assembly workability of this fixed type constant velocity universal joint can be reduced. Improvements can be made.

ケース５５をケース圧入孔２ａに挿入する際に、突起片６５がケース圧入孔２ａの内周面に引っ掛ることなく滑らかに挿入して行くことができ、ケース圧入（挿入）作業を一層行ない易くできる。また、突起片６５が圧接した圧入状態では、ケース５５に対して反圧入方向の抜け力が作用しても、突起片６５の外端部がケース圧入孔２ａの内周面６７に引っ掛ることになって、抜けを有効に防止できる。突起片６５はケース５５の周壁５９の一部を起せばよいので、突起片形成作業（突起片加工作業）の簡略化を図ることができ、生産性の向上を達成できる。   When the case 55 is inserted into the case press-fitting hole 2a, the protruding piece 65 can be smoothly inserted without being caught on the inner peripheral surface of the case press-fitting hole 2a, and the case press-fitting (insertion) operation can be further facilitated. it can. Further, in the press-fit state in which the projecting piece 65 is press-contacted, the outer end portion of the projecting piece 65 is caught on the inner peripheral surface 67 of the case press-fitting hole 2a even if a withdrawal force in the counter press-fit direction acts on the case 55. Thus, it is possible to effectively prevent omission. Since the protruding piece 65 only needs to be raised at a part of the peripheral wall 59 of the case 55, it is possible to simplify the protruding piece forming operation (projecting piece processing operation) and to improve productivity.

突起片６５を複数個設けることによって、ケース５５の圧入状態が一層安定し、ケース抜けを確実に防止することができる。   By providing a plurality of the projecting pieces 65, the press-fitted state of the case 55 is further stabilized, and the case can be reliably prevented from coming off.

前記実施の形態では、突起片６５を周方向に沿って３個配置しているが、その数は任意であって、すくなくとも１個あればよく、複数個配設する場合に同心円上に設けなくてもよい。また、軸方向に沿って複数個並べるようにしてもよい。   In the above-described embodiment, three protrusion pieces 65 are arranged along the circumferential direction. However, the number is arbitrary, and at least one protrusion piece 65 is sufficient. May be. Also, a plurality may be arranged along the axial direction.

突起片６５の傾斜角度や傾斜角度に基づく外径方向突出寸法等は、ケース５５を圧入孔２ａに挿入することができ、かつ、挿入された状態で、突起片６５が圧入孔２ａの内周面６７に圧接するものであればよい。   The inclination angle of the projection piece 65 and the projecting dimension of the outer diameter direction based on the inclination angle are such that the case 55 can be inserted into the press-fitting hole 2a and the projection piece 65 is inserted into the inner periphery of the press-fitting hole 2a. What is necessary is just to press-contact to the surface 67. FIG.

突起片６５の配設位置は、前記実施の形態ではケース５５の周壁５９の軸方向中央部であったが、ケース圧入孔２ａの内周面６７に圧接してケース圧入状態が確保できれば、位置変更は可能である。   In the above-described embodiment, the projecting piece 65 is disposed at the central portion in the axial direction of the peripheral wall 59 of the case 55. However, if the case press-fit state can be secured by pressing against the inner peripheral surface 67 of the case press-fitting hole 2a, Changes are possible.

ケース５５の周壁５９として、円筒体とせずに角筒体にて構成してもよい。ケース５５の周壁５９を角筒体にて構成した場合、ケース圧入孔２ａをそれに対応した角孔とするか、または突起片６５の高さを調整し、ケース圧入孔２ａの内周面６７に圧接するように設定する必要がある。   The peripheral wall 59 of the case 55 may be formed of a rectangular tube instead of a cylindrical body. When the peripheral wall 59 of the case 55 is formed of a rectangular cylinder, the case press-fitting hole 2a is a square hole corresponding thereto, or the height of the protruding piece 65 is adjusted, and the inner peripheral surface 67 of the case press-fitting hole 2a is formed. It is necessary to set so as to press.

本発明では、等速自在継手内のトラック溝すきまを詰めて回転バックラッシュを防止するので、自動車のステアリング装置の継手として最適となる。なお、自動車のステアリング装置は、モータによる操舵補助力を付与するようにした電動パワーステアリング装置であってよいし、油圧式のパワーステアリング装置であってもよい。   In the present invention, since the track groove clearance in the constant velocity universal joint is filled to prevent the rotation backlash, it is optimal as a joint for an automobile steering device. Note that the vehicle steering apparatus may be an electric power steering apparatus that applies a steering assist force by a motor, or may be a hydraulic power steering apparatus.

本発明の実施の形態を示す固定型等速自在継手の断面図である。It is sectional drawing of the fixed type constant velocity universal joint which shows embodiment of this invention. 前記固定型等速自在継手で二軸が作動角をとった状態の断面図である。FIG. 4 is a cross-sectional view of the fixed type constant velocity universal joint in a state where two axes have an operating angle. 前記固定型等速自在継手の要部拡大断面図である。It is a principal part expanded sectional view of the said fixed type constant velocity universal joint. プランジャユニットの拡大断面図である。It is an expanded sectional view of a plunger unit. プランジャユニットの要部拡大平面図である。It is a principal part enlarged plan view of a plunger unit. プランジャユニットの拡大背面図である。It is an enlarged rear view of a plunger unit. プランジャユニットのシャフトへの取付け方法を示す説明図である。It is explanatory drawing which shows the attachment method to the shaft of a plunger unit. ステアリング装置を示し、（ａ）は平面図であり、（ｂ）は側面図であり、（ｃ）は斜視図である。A steering device is shown, (a) is a top view, (b) is a side view, (c) is a perspective view. 固定型等速自在継手の従来例を示す断面図である。It is sectional drawing which shows the prior art example of a fixed type constant velocity universal joint.

符号の説明Explanation of symbols

１ 固定型等速自在継手
１０ 外方部材（外輪）
１２ 球状内面
１４，２４ トラック溝
２０ 内方部材（内輪）
２２ 球状外面
３０ ボール
４０ 保持器
５０ 与圧付与手段（プランジャユニット）
５２ 押圧部
５３ 押圧部材
５４ 弾性部材
５５ ケース
５６ 受け部材
５８ 受け部
５９ 周壁
６５ 突起片 1 Fixed type constant velocity universal joint 10 Outer member (outer ring)
12 spherical inner surface 14, 24 track groove 20 inner member (inner ring)
22 spherical outer surface 30 ball 40 cage 50 pressurizing means (plunger unit)
52 pressing portion 53 pressing member 54 elastic member 55 case 56 receiving member 58 receiving portion 59 peripheral wall 65 projecting piece

Claims (5)

複数のトラック溝が形成された球状内面を備えた外方部材と、複数のトラック溝が形成された球状外面を備えた内方部材と、外方部材のトラック溝と内方部材のトラック溝の協働で形成された楔形のボールトラックに配置したボールと、外方部材の球状内面と内方部材の球状外面との間に配置され、ボールを保持する保持器とを備え、弾性的な押圧力を軸方向に作用させる押圧部と、押圧部からの押圧力を受ける受け部とを有する与圧付与手段にて、トラック溝のアキシャルすきまを詰める固定型等速自在継手において、
前記与圧付与手段は、前記内方部材のケース圧入孔に圧入されるケースと、ケースに収容されてケース開口部から突出した先端部が前記押圧部となる押圧部材と、ケースに収容されて前記押圧部に弾性的な押圧力を付与する弾性部材とを有し、前記ケースの周壁に、外径方向に突出してケース圧入孔の内周面に圧接する突起片を設けたことを特徴とする固定型等速自在継手。 An outer member having a spherical inner surface in which a plurality of track grooves are formed, an inner member having a spherical outer surface in which a plurality of track grooves are formed, a track groove in the outer member, and a track groove in the inner member. An elastic pusher includes a ball arranged on a wedge-shaped ball track formed in cooperation, a cage arranged between the spherical inner surface of the outer member and the spherical outer surface of the inner member, and holding the ball. In the fixed type constant velocity universal joint that closes the axial clearance of the track groove with the pressurizing means having a pressing portion that applies pressure in the axial direction and a receiving portion that receives the pressing force from the pressing portion,
The pressurizing means includes a case that is press-fitted into a case press-fitting hole of the inner member, a pressing member that is accommodated in the case and protrudes from the case opening and serves as the pressing portion, and is accommodated in the case. An elastic member that applies an elastic pressing force to the pressing portion, and a protruding piece that protrudes in an outer diameter direction and presses against an inner peripheral surface of the case press-fitting hole is provided on the peripheral wall of the case. Fixed type constant velocity universal joint. 前記突起片は、ケースの周壁の一部を反圧入方向に向かって外径方向に順次傾斜するように起した傾斜片であることを特徴とする請求項１に記載の固定型等速自在継手。   2. The fixed type constant velocity universal joint according to claim 1, wherein the protruding piece is an inclined piece that is formed such that a part of the peripheral wall of the case is sequentially inclined in the outer diameter direction toward the counter press-fitting direction. . 前記突起片が周方向に沿って複数個配置されていることを特徴とする請求項１又は２に記載の固定型等速自在継手。   The fixed type constant velocity universal joint according to claim 1, wherein a plurality of the projecting pieces are arranged along a circumferential direction. 前記突起片が軸方向に沿って複数個配置されていることを特徴とする請求項１〜３のいずれか一項に記載の固定型等速自在継手。   The fixed type constant velocity universal joint according to any one of claims 1 to 3, wherein a plurality of the protruding pieces are arranged along the axial direction. 自動車のステアリング装置に組み込まれた請求項１〜４のいずれか一項に記載の固定型等速自在継手。   The fixed type constant velocity universal joint as described in any one of Claims 1-4 incorporated in the steering device of the motor vehicle.
JP2005232141A 2005-08-10 2005-08-10 Fixed constant velocity universal joint Withdrawn JP2007046713A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009036303A (en) * 2007-08-01 2009-02-19 Ntn Corp Fixed type constant velocity universal joint
JP2014074523A (en) * 2012-10-03 2014-04-24 Toho Gas Co Ltd Atomizer of latent heat recovery type hot water system and latent heat recovery type hot water system
CN110945239A (en) * 2017-07-20 2020-03-31 罗伯特·博世有限公司 Piston pump

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009036303A (en) * 2007-08-01 2009-02-19 Ntn Corp Fixed type constant velocity universal joint
JP2014074523A (en) * 2012-10-03 2014-04-24 Toho Gas Co Ltd Atomizer of latent heat recovery type hot water system and latent heat recovery type hot water system
CN110945239A (en) * 2017-07-20 2020-03-31 罗伯特·博世有限公司 Piston pump
JP2020527209A (en) * 2017-07-20 2020-09-03 ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ Piston pump
US11261853B2 (en) 2017-07-20 2022-03-01 Robert Bosch Gmbh Piston pump
CN110945239B (en) * 2017-07-20 2022-04-26 罗伯特·博世有限公司 Piston pump

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