JP2011208740A

JP2011208740A - Slide bearing

Info

Publication number: JP2011208740A
Application number: JP2010077675A
Authority: JP
Inventors: Yoshihiro Ozawa; 慶洋小澤; Motohei Yamada; 素平山田; Akira Ono; 晃小野
Original assignee: Daido Metal Co Ltd
Current assignee: Daido Metal Co Ltd
Priority date: 2010-03-30
Filing date: 2010-03-30
Publication date: 2011-10-20

Abstract

PROBLEM TO BE SOLVED: To provide a slide bearing which effectively discharges a foreign matter so as to prevent the foreign matter from being mixed on the sliding surface of the slide bearing.SOLUTION: In the sliding bearing 1, since a foreign matter trapping space 7 and an axial groove 6 are formed in a circumferential end face 3b of a lower half bearing 3 on a combined surface 5a located in front of the relatively rotational direction of a crank shaft 10 with respect to an upper half bearing 2 formed with an oil groove 4, the foreign matter which reaches the circumferential end located in front of the relatively rotational direction of a crank shaft 10 while rotating on the groove bottom surface of the oil groove 4 in the upper half bearing 2 can be easily trapped in the foreign matter trapping space 7 communicating with the groove bottom surface of the circumferential end. The foreign matter trapped in the foreign matter trapping space 7 can be smoothly discharged to the width-direction end surface 3c side of the lower half bearing 3 through the axial groove 6 communicating with the foreign matter trapped space 7.

Description

本発明は、内燃機関のクランク軸を支持するように一対の半割軸受を組み合わせて円筒形となり、前記一対の半割軸受のうち、少なくとも内周面に周方向に沿った油溝が形成された第１の半割軸受に対して前記クランク軸の相対回転方向の前方側にあたる周方向端面に前記油溝が開口するように形成されたすべり軸受に関するものである。 In the present invention, a pair of half bearings are combined to support a crankshaft of an internal combustion engine to form a cylindrical shape, and at least an oil groove extending in the circumferential direction is formed on the inner peripheral surface of the pair of half bearings. Further, the present invention relates to a slide bearing formed such that the oil groove is opened at a circumferential end face corresponding to the front side in the relative rotational direction of the crankshaft with respect to the first half bearing.

従来、内燃機関のクランク軸用すべり軸受は、一対の半割軸受を組み合わせて円筒形にしたものを使用している。一対の半割軸受のうちの少なくとも一方の半割軸受の内周面の半割軸受の幅方向中央には、円周方向に沿った油溝が形成されることにより、この油溝を経てすべり軸受の摺動面に対する給油が行なわれていた（例えば、特許文献１）。 2. Description of the Related Art Conventionally, a crankshaft plain bearing for an internal combustion engine is a cylindrical bearing combined with a pair of half bearings. An oil groove along the circumferential direction is formed in the center in the width direction of the half bearing on the inner circumferential surface of at least one half bearing of the pair of half bearings. Oil supply to the sliding surface of the bearing has been performed (for example, Patent Document 1).

また、すべり軸受に供給される潤滑油中に混入する異物がすべり軸受の摺動面へ混入することを防止するため、軸受内周面の油溝と連通するように軸受内周面の周方向端部にリリーフ部を形成し、そのリリーフ部とクランク軸との隙間を異物排出路とするすべり軸受が提案されている（例えば、特許文献２）。 Also, in order to prevent foreign matter mixed in the lubricating oil supplied to the sliding bearing from entering the sliding surface of the sliding bearing, the circumferential direction of the bearing inner peripheral surface is communicated with the oil groove on the bearing inner peripheral surface. There has been proposed a plain bearing in which a relief portion is formed at an end portion and a gap between the relief portion and the crankshaft is used as a foreign matter discharge path (for example, Patent Document 2).

特許文献２に開示される技術においては、図１４（Ａ），（Ｂ）に示すように、内燃機関のクランク軸用すべり軸受２１への潤滑油の供給が、まず、クランク軸用すべり軸受２１の外部から上半割軸受２２に形成される供給穴２２ａを介して内周面に形成された油溝２４内に供給され、その潤滑油がクランク軸用すべり軸受２１の摺動面及びクランクピン用すべり軸受（図示しない）の摺動面に供給される。この場合、内燃機関の最初の運転時には、上半割軸受２２の油溝２４に供給される潤滑油に対して潤滑油路内に残留した異物が混入する場合が多いことが知られている。この異物は、潤滑油路の切削加工時の金属加工屑や鋳造時の鋳砂などであり、クランク軸２０の回転による潤滑油の流れに付随し、油溝２４内をクランク軸２０の相対回転方向の前方側へ流れるが、半割軸受２２，２３の組合せ面２５付近に到達すると、油溝２４を形成しない下半割軸受２３の周方向端面が障壁となる影響により潤滑油とともに内周面側に浮上する（図１５（Ａ）参照）。そこで、従来のクランク軸用すべり軸受２１では、半割軸受２２，２３の内周面の周方向端部にクラッシュリリーフや面取等の隙間２６を形成することにより、この隙間２６から半割軸受２２，２３の幅方向端部へ潤滑油と一緒に異物を排出させていた。 In the technique disclosed in Patent Document 2, as shown in FIGS. 14A and 14B, the supply of lubricating oil to the crankshaft slide bearing 21 of the internal combustion engine is performed first. Is supplied into an oil groove 24 formed on the inner peripheral surface through a supply hole 22a formed in the upper half bearing 22, and the lubricating oil is supplied to the sliding surface of the crankshaft slide bearing 21 and the crank pin. Supplied to the sliding surface of a plain bearing (not shown). In this case, it is known that the foreign matter remaining in the lubricating oil passage is often mixed with the lubricating oil supplied to the oil groove 24 of the upper half bearing 22 during the initial operation of the internal combustion engine. This foreign matter is metal scraps during cutting of the lubricating oil passage, casting sand during casting, etc., accompanying the flow of lubricating oil due to rotation of the crankshaft 20, and relative rotation of the crankshaft 20 in the oil groove 24. Flow toward the front side in the direction, but when it reaches the vicinity of the combined surface 25 of the half bearings 22 and 23, the inner circumferential surface together with the lubricating oil due to the influence of the circumferential end surface of the lower half bearing 23 that does not form the oil groove 24 becomes a barrier Ascend to the side (see FIG. 15A). Therefore, in the conventional plain bearing 21 for a crankshaft, a clearance 26 such as a crush relief or chamfering is formed at the circumferential end portion of the inner peripheral surface of the half bearings 22 and 23 so that the half bearing Foreign matters were discharged together with the lubricating oil to the end portions in the width direction of 22 and 23.

特開平８−２７７８３１号公報JP-A-8-277831 特開２００５−６９２８３号公報JP 2005-69283 A

ところで、近年の内燃機関はクランク軸の高回転化により、潤滑油より比重の大きい異物の周方向へ直進しようとする慣性力が大きくなっている。図１５（Ｂ）には、このような比重の大きい異物のすべり軸受２１における排出メカニズムを説明するための拡大図を示す。クランク軸２０を高回転化させた場合、図１５（Ｂ）の矢印Ａに示すように、上半割軸受２２における油溝２４の溝底面を転動してきた異物が油溝２４の端部に到達しても、この周方向端部に形成された隙間２６から排出されず、油溝２４を形成していない側の下半割軸受２３の摺動面に混入しやすくなっていた。また、図１５（Ｂ）の矢印Ｂに示すように、クランク軸２０の回転による潤滑油の周方向への流れにより、油溝２４の端部に到達した異物がクラッシュリリーフや面取等により形成される隙間２６に入ったとしても、再び隙間２６から押し出されて下半割軸受２３の摺動面に混入するものも多かった。すなわち、油溝２４の溝底面を転動してきた異物が油溝２４の端部に到達しても、図１５（Ｂ）の矢印Ｃに示すように、その全ての異物が半割軸受２２，２３の幅方向端部に排出されることはなく、図１５（Ｂ）の矢印Ａ，Ｂに示すように、油溝２４が形成されない下半割軸受２３の摺動面（内周面）に混入する場合も多かった。 By the way, in recent internal combustion engines, due to the higher rotation of the crankshaft, the inertial force that tries to go straight in the circumferential direction of foreign matters having a specific gravity greater than that of the lubricating oil is increasing. FIG. 15B is an enlarged view for explaining the discharge mechanism of the foreign matter slide bearing 21 having such a large specific gravity. When the crankshaft 20 is rotated at a high speed, the foreign matter rolling on the bottom surface of the oil groove 24 in the upper half bearing 22 appears at the end of the oil groove 24 as shown by an arrow A in FIG. Even if it reaches, it is not discharged from the gap 26 formed at the end in the circumferential direction, and is easily mixed into the sliding surface of the lower half bearing 23 on the side where the oil groove 24 is not formed. Further, as shown by an arrow B in FIG. 15B, the foreign matter reaching the end of the oil groove 24 is formed by crush relief, chamfering, or the like due to the flow of the lubricating oil in the circumferential direction due to the rotation of the crankshaft 20. Even if it entered the clearance 26, it was often pushed out of the clearance 26 again and mixed into the sliding surface of the lower half bearing 23. That is, even if the foreign matter that has rolled on the bottom surface of the oil groove 24 reaches the end of the oil groove 24, all the foreign matter remains as shown in the arrow C in FIG. As shown by arrows A and B in FIG. 15 (B), it is not discharged onto the sliding end surface (inner peripheral surface) of the lower half bearing 23 where the oil groove 24 is not formed. In many cases, it was mixed.

本発明は、上記した事情に鑑みなされたものであり、その目的とするところは、すべり軸受の摺動面に異物が混入することを防止するため、この異物の排出を効果的に行うことができるすべり軸受を提供することにある。 The present invention has been made in view of the circumstances described above, and the object of the present invention is to effectively discharge the foreign matter in order to prevent the foreign matter from entering the sliding surface of the slide bearing. The object is to provide a plain bearing that can be used.

上記した目的を達成するために、請求項１に係る発明においては、内燃機関のクランク軸を支持するように一対の半割軸受を組み合わせて円筒形となり、前記一対の半割軸受のうち、少なくとも内周面に周方向に沿った油溝が形成された第１の半割軸受に対して前記クランク軸の相対回転方向の前方側にあたる周方向端面に前記油溝が開口するように形成されたすべり軸受において、前記一対の半割軸受の組合せ面のうち、前記第１の半割軸受に対して前記クランク軸の相対回転方向の前方側にあたる組合せ面において、前記油溝が形成されない第２の半割軸受の周方向端面には、前記油溝内を流れる異物を捕捉可能な異物捕捉空間が、前記一対の半割軸受の内周面には開口することなく、前記油溝の開口の少なくとも溝底面側の幅方向の両端部と連通するように形成され、前記第１の半割軸受および／または前記第２の半割軸受の周方向端面には、前記周方向に直交する軸線方向に沿った軸線方向溝が、前記一対の半割軸受の内周面には開口することなく、前記一対の半割軸受の幅方向端面に開口すると共に、前記異物捕捉空間と連通するように形成されることを特徴とする。 In order to achieve the above object, in the invention according to claim 1, a pair of half bearings are combined so as to support a crankshaft of an internal combustion engine to form a cylindrical shape, and at least one of the pair of half bearings. With respect to the first half bearing in which an oil groove extending in the circumferential direction is formed on the inner peripheral surface, the oil groove is formed so as to open on a circumferential end surface corresponding to the front side in the relative rotation direction of the crankshaft. In the sliding bearing, the second groove in which the oil groove is not formed on the combination surface corresponding to the front side in the relative rotation direction of the crankshaft with respect to the first half bearing among the combination surfaces of the pair of half bearings. The circumferential end face of the half bearing has a foreign matter capturing space capable of catching foreign matter flowing in the oil groove without opening on the inner circumferential surface of the pair of half bearings. Both width direction of groove bottom side An axial groove along an axial direction orthogonal to the circumferential direction is formed on the circumferential end surface of the first half bearing and / or the second half bearing. The pair of half bearings are formed so as not to open on the inner peripheral surfaces of the pair of half bearings but to open to the width direction end surfaces of the pair of half bearings and to communicate with the foreign matter capturing space.

請求項２に係る発明においては、請求項１記載のすべり軸受において、前記第２の半割軸受の周方向端面には、前記油溝の開口の溝底面側の幅方向の両端部と各々連通する前記異物捕捉空間が２個形成されることを特徴とする。 According to a second aspect of the present invention, in the slide bearing according to the first aspect, the circumferential end surface of the second half bearing communicates with both ends in the width direction on the groove bottom side of the opening of the oil groove. Two foreign matter capturing spaces are formed.

請求項３に係る発明においては、請求項１又は請求項２に記載のすべり軸受において、前記異物捕捉空間は、前記油溝の開口の溝底面よりも前記第２の半割軸受の外周面側に向かって空間が広がるように形成されることを特徴とする。 According to a third aspect of the present invention, in the slide bearing according to the first or second aspect, the foreign matter capturing space is located on the outer peripheral surface side of the second half bearing from the groove bottom surface of the oil groove opening. It is characterized by being formed so that the space widens toward the.

請求項４に係る発明においては、請求項１乃至請求項３のいずれかに記載のすべり軸受において、前記第１の半割軸受に対して前記クランク軸の相対回転方向の前方側にあたる周方向端面に近い領域において、前記油溝は、幅方向の中央部側に対して幅方向の両端部の溝深さが深く形成されることを特徴とする。 In the invention which concerns on Claim 4, in the slide bearing in any one of Claim 1 thru | or 3, the circumferential direction end surface which hits the front side of the relative rotation direction of the said crankshaft with respect to a said 1st half bearing. The oil groove is characterized in that the groove depth at both ends in the width direction is deeper than the center portion in the width direction.

請求項５に係る発明においては、請求項１乃至請求項４のいずれかに記載のすべり軸受において、前記軸線方向溝は、前記第１の半割軸受および／または前記第２の半割軸受の周方向端面の外周面側に沿って形成されることを特徴とする。 In the invention which concerns on Claim 5, in the slide bearing in any one of Claim 1 thru | or 4, the said axial direction groove | channel is a said 1st half bearing and / or a said 2nd half bearing. It is formed along the outer peripheral surface side of the circumferential end surface.

請求項１に係る発明においては、一対の半割軸受の組合せ面のうち、第１の半割軸受に対してクランク軸の相対回転方向の前方側にあたる組合せ面において、油溝が形成されない第２の半割軸受の周方向端面には、油溝内を流れる異物を捕捉可能な異物捕捉空間が、一対の半割軸受の内周面には開口することなく、油溝の開口の少なくとも溝底面側の幅方向の両端部と連通するように形成され、第１の半割軸受および／または第２の半割軸受の周方向端面には、周方向に直交する軸線方向に沿った軸線方向溝が、一対の半割軸受の内周面には開口することなく、一対の半割軸受の幅方向端面に開口すると共に、異物捕捉空間と連通するように形成されることにより、クランク軸の相対回転方向の前方側にあたる周方向端部に到達した異物が、その周方向端部の溝底面の幅方向の両端部と連通する異物捕捉空間に捕捉されやすく、この異物捕捉空間に捕捉された異物を、異物捕捉空間と連通する軸線方向溝を介して半割軸受の幅方向端面側にスムーズに排出することができる。 In the invention which concerns on Claim 1, an oil groove is not formed in the combination surface which hits the front side of the relative rotation direction of a crankshaft with respect to a 1st half bearing among the combination surfaces of a pair of half bearing. The circumferential end face of each of the half bearings has a foreign matter catching space capable of catching foreign matter flowing in the oil groove without opening on the inner circumferential face of the pair of half bearings. An axial groove along the axial direction perpendicular to the circumferential direction is formed on the circumferential end surface of the first half bearing and / or the second half bearing. However, it is formed so as not to open to the inner peripheral surface of the pair of half bearings but to the end surface in the width direction of the pair of half bearings and to communicate with the foreign matter capturing space. Foreign matter that has reached the circumferential end on the front side in the rotational direction It is easy to be caught in the foreign matter catching space that communicates with both ends in the width direction of the groove bottom surface of the circumferential end portion of the circumferential direction, and the foreign matter caught in this foreign matter catching space is halved via the axial groove communicated with the foreign matter catching space. It can be smoothly discharged to the end surface side in the width direction of the bearing.

請求項２に係る発明においては、第２の半割軸受の周方向端面には、油溝の開口の溝底面側の幅方向の両端部と各々連通する異物捕捉空間が２個形成されることにより、各々の異物捕捉空間に捕捉された異物を、その異物捕捉空間と連通する軸線方向溝を介して半割軸受の幅方向端面側にさらにスムーズに排出することができる。 In the invention which concerns on Claim 2, two foreign material capture | acquisition space each connected with the both ends of the width direction of the groove bottom face side of the opening of an oil groove is formed in the circumferential direction end surface of a 2nd half bearing. Thus, the foreign matter captured in each foreign matter capturing space can be discharged more smoothly to the end surface in the width direction of the half bearing through the axial groove communicating with the foreign matter capturing space.

請求項３に係る発明においては、異物捕捉空間は、油溝の開口の溝底面よりも第２の半割軸受の外周面側に向かって空間が広がるように形成されることにより、異物捕捉空間が、異物に対する周方向への慣性力、及びすべり軸受の半径方向への遠心力の作用方向に空間が広がっており、異物が異物捕捉空間に捕捉されやすくなる。 In the invention according to claim 3, the foreign matter capturing space is formed so that the space expands from the groove bottom surface of the oil groove opening toward the outer peripheral surface side of the second half bearing. However, the space is expanded in the direction of the action of the inertial force on the foreign matter in the circumferential direction and the centrifugal force in the radial direction of the slide bearing, and the foreign matter is easily trapped in the foreign matter trapping space.

請求項４に係る発明においては、第１の半割軸受に対してクランク軸の相対回転方向の前方側にあたる周方向端面に近い領域において、油溝は、幅方向の中央部側に対して幅方向の両端部の溝深さが深く形成されることにより、油溝内に進入した異物が、油溝の溝底面の幅方向の両端部から逸脱しがたくなり、異物が異物捕捉空間に捕捉されやすくなる。 In the invention according to claim 4, in the region close to the circumferential end surface corresponding to the front side in the relative rotation direction of the crankshaft with respect to the first half bearing, the oil groove has a width with respect to the central portion side in the width direction. By forming the groove depth deep at both ends in the direction, foreign matter that has entered the oil groove is unlikely to deviate from both ends in the width direction of the bottom surface of the oil groove, and the foreign matter is captured in the foreign matter capture space. It becomes easy to be done.

請求項５に係る発明においては、軸線方向溝は、第１の半割軸受および／または第２の半割軸受の周方向端面の外周面側に沿って形成されることにより、内燃機関の仕様により半割軸受の肉厚（壁厚）が薄く設定される場合でも、下半割軸受の周方向端面内に異物捕捉空間を形成するスペースを確保することができる。 In the invention which concerns on Claim 5, an axial direction groove | channel is formed along the outer peripheral surface side of the circumferential direction end surface of a 1st half bearing and / or a 2nd half bearing, The specification of an internal combustion engine Therefore, even when the wall thickness (wall thickness) of the half bearing is set to be thin, a space for forming a foreign matter capturing space can be secured in the circumferential end surface of the lower half bearing.

クランク軸を支持する２つの上半割軸受と下半割軸受からなるすべり軸受の側面図である。It is a side view of the slide bearing which consists of two upper half bearings and a lower half bearing which support a crankshaft. 上半割軸受の平面図である。It is a top view of an upper half bearing. 下半割軸受の平面図である。It is a top view of a lower half bearing. 図３のＡ−Ａにおける異物捕捉空間の断面図である。It is sectional drawing of the foreign material capture | acquisition space in AA of FIG. 上半割軸受の周方向端面に開口した油溝の横断面図である。It is a cross-sectional view of the oil groove opened on the circumferential end surface of the upper half bearing. 軸線方向溝の断面図である。It is sectional drawing of an axial direction groove | channel. 第２実施形態に係る下半割軸受の平面図である。It is a top view of the lower half bearing which concerns on 2nd Embodiment. 第２実施形態に係るすべり軸受における異物の排出メカニズムを説明するための拡大図である。It is an enlarged view for demonstrating the discharge | emission mechanism of the foreign material in the slide bearing which concerns on 2nd Embodiment. 第３実施形態に係る上半割軸受の平面図である。It is a top view of the upper half bearing concerning a 3rd embodiment. 第３実施形態に係る上半割軸受２の周方向端面に開口した油溝の横断面図である。It is a cross-sectional view of the oil groove opened to the circumferential end surface of the upper half bearing 2 according to the third embodiment. 第３実施形態に係る上半割軸受における油溝の幅方向の両端部の溝深さを深く形成する範囲を説明するための上半割軸受の側面図である。It is a side view of the upper half bearing for demonstrating the range which forms deeply the groove depth of the both ends of the width direction of an oil groove in the upper half bearing which concerns on 3rd Embodiment. 第４実施形態に係るすべり軸受１の側面図である。It is a side view of the sliding bearing 1 which concerns on 4th Embodiment. 第４実施形態に係る下半割軸受３の平面図である。It is a top view of the lower half bearing 3 which concerns on 4th Embodiment. 従来例を示す図１相当図である。It is a figure equivalent to FIG. 1 which shows a prior art example. 従来のすべり軸受における異物の排出メカニズムを説明するための拡大図である。It is an enlarged view for demonstrating the discharge mechanism of the foreign material in the conventional slide bearing.

以下、本発明の実施形態について図１乃至図６を参照して説明する。図１は、クランク軸１０を支持する２つの上半割軸受２と下半割軸受３からなるすべり軸受１の側面図であり、図２は、上半割軸受２の平面図であり、図３は、下半割軸受３の平面図であり、図４は、図３のＡ−Ａにおける異物捕捉空間７の断面図であり、図５は、上半割軸受２の周方向端面２ｂに開口した油溝４の横断面図であり、図６は、軸線方向溝６の断面図である。なお、上記した図は、実施形態に係るすべり軸受１の概略図であり、構成，構造等を理解し易くするために各箇所が誇張あるいは省略して描かれている。 Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 6. FIG. 1 is a side view of a plain bearing 1 including two upper half bearings 2 and a lower half bearing 3 that support a crankshaft 10, and FIG. 2 is a plan view of the upper half bearing 2. 3 is a plan view of the lower half bearing 3, FIG. 4 is a cross-sectional view of the foreign matter capturing space 7 in AA of FIG. 3, and FIG. 5 is a plan view of the circumferential end face 2 b of the upper half bearing 2. FIG. 6 is a cross-sectional view of the open oil groove 4, and FIG. 6 is a cross-sectional view of the axial groove 6. In addition, the above-mentioned figure is the schematic of the slide bearing 1 which concerns on embodiment, and in order to make it easy to understand a structure, a structure, etc., each location is drawn exaggerating or abbreviate | omitting.

まず、請求項１に係る発明に対応する第１実施形態について、図１を参照して説明する。図１に示すように、内燃機関のクランク軸１０を回転可能に支持するすべり軸受１は、半割形状に形成された一対の半割軸受２，３が周方向端面２ｂ，３ｂの両端面で当接する組合せ面５ａ，５ｂで上下２個組み合わせて円筒形状となるように形成されている。 First, a first embodiment corresponding to the invention according to claim 1 will be described with reference to FIG. As shown in FIG. 1, a slide bearing 1 that rotatably supports a crankshaft 10 of an internal combustion engine has a pair of half bearings 2 and 3 formed in a half shape at both end faces of circumferential end faces 2b and 3b. The combination surfaces 5a and 5b that come into contact with each other are formed in a cylindrical shape by combining two upper and lower surfaces.

また、図２に示すように、半割軸受２，３のうち上半割軸受２の内周面２ａの幅方向ほぼ中央には、半割軸受２，３と該半割軸受２，３に支持されるクランク軸１０との間に潤滑油を供給するための油溝４が、円周方向の全体に沿って形成されている。この油溝４は、内燃機関の仕様により溝深さや溝底面の幅は異なるが、本発明において制約はない。例えば、産業機械用の内燃機関のクランク軸１０用のすべり軸受１では、半割軸受２，３の厚さが５〜６ｍｍの範囲の仕様のものでは溝深さが３ｍｍ程度、溝底面の幅が１５ｍｍ程度で形成されると共に、その両端部が上半割軸受２の周方向端面２ｂで開口するように形成されるのが一般的である。また、油溝４には、外部から油の供給を受けるための供給穴４ａが、上半割軸受２の半径方向に貫通して形成されている。 In addition, as shown in FIG. 2, of the half bearings 2 and 3, the half bearings 2 and 3 and the half bearings 2 and 3 are located at substantially the center in the width direction of the inner peripheral surface 2 a of the upper half bearing 2. An oil groove 4 for supplying lubricating oil between the crankshaft 10 and the supported crankshaft 10 is formed along the entire circumferential direction. The oil groove 4 has a groove depth and a groove bottom width that differ depending on the specifications of the internal combustion engine, but there is no restriction in the present invention. For example, in the case of the slide bearing 1 for the crankshaft 10 of the internal combustion engine for industrial machines, the groove depth is about 3 mm and the width of the groove bottom surface when the half bearings 2 and 3 have a specification in the range of 5 to 6 mm. Is generally formed so that both end portions thereof are opened at the circumferential end surface 2b of the upper half bearing 2. The oil groove 4 is formed with a supply hole 4 a for receiving oil supply from the outside so as to penetrate in the radial direction of the upper half bearing 2.

ところで、第１実施形態におけるすべり軸受１を構成する上半割軸受２の周方向端面２ｂと下半割軸受３の周方向端面３ｂの当接面である両組合せ面５ａ，５ｂのうち、油溝４を形成した上半割軸受２に対してクランク軸１０の相対回転方向の前方側にあたる組合せ面５ａにおいて、上半割軸受２の周方向端面２ｂと当接する下半割軸受３の周方向端面３ｂ内には、図１及び図３に示すように、油溝４内を周方向に流れてきた異物を捕捉するための異物捕捉空間７、及び異物捕捉空間７が捕捉した異物を潤滑油と一緒にすべり軸受１の外部へ排出するための軸線方向溝６が形成されている。 By the way, of the combined surfaces 5a and 5b, which are contact surfaces of the circumferential end surface 2b of the upper half bearing 2 and the circumferential end surface 3b of the lower half bearing 3 constituting the sliding bearing 1 in the first embodiment, The circumferential direction of the lower half bearing 3 in contact with the circumferential end surface 2b of the upper half bearing 2 on the combined surface 5a corresponding to the front side in the relative rotational direction of the crankshaft 10 with respect to the upper half bearing 2 in which the groove 4 is formed. In the end face 3b, as shown in FIGS. 1 and 3, the foreign matter catching space 7 for catching the foreign matter flowing in the circumferential direction in the oil groove 4 and the foreign matter captured by the foreign matter catching space 7 are lubricated. And an axial groove 6 for discharging the slide bearing 1 to the outside.

図４に示すように、異物捕捉空間７は、下半割軸受３の周方向端面３ｂの内周面３ａ側に異物捕捉空間７の非形成領域Ｔを設けることにより、下半割軸受３の内周面３ａには開口させない。このため、異物捕捉空間７が捕捉した異物は、半割軸受２，３の内周面２ａ，３ａ側に浮上することを防ぐことができる。なお、異物捕捉空間７の非形成領域Ｔは、軸受材料の強度の点から１ｍｍ以上とすることが好ましい。また、異物捕捉空間７の深さＤ１は、１ｍｍ以上とすることが好ましい。 As shown in FIG. 4, the foreign material capturing space 7 is formed by providing a non-formation region T of the foreign material capturing space 7 on the inner peripheral surface 3 a side of the circumferential end surface 3 b of the lower half bearing 3. It does not open to the inner peripheral surface 3a. For this reason, the foreign material captured by the foreign material capturing space 7 can be prevented from floating on the inner peripheral surfaces 2a and 3a side of the half bearings 2 and 3. In addition, it is preferable that the non-formation area | region T of the foreign material capture | acquisition space 7 shall be 1 mm or more from the point of the intensity | strength of a bearing material. Further, the depth D1 of the foreign substance capturing space 7 is preferably 1 mm or more.

また、図１に示すように、異物捕捉空間７は、上半割軸受２の周方向端面２ｂで開口する油溝４の溝底面と連通するように形成されている。なお、潤滑油とともに上半割軸受２の油溝４内に進入した異物は、主に油溝４の溝底面側を転動しながらクランク軸１０の相対回転方向の前方側に進むこと、さらに、少なくともクランク軸１０の相対回転方向の前方側にあたる周方向端面２ｂに近い領域では、油溝４の溝底面の幅方向の両端側を流れることが確認されている。このため、図５に示すように、異物捕捉空間７は、上半割軸受２の周方向端面２ｂで開口する油溝４の少なくとも溝底面の幅方向の両端部と連通するように形成されることが好ましい。この異物捕捉空間７と連通する領域は、油溝４の溝底面から溝深さＤ２の１０％以上、油溝４の溝底面の幅方向の各端部から溝底面の溝幅Ｗ２の１０％以上の領域（図５に示す斜線ハッチングした領域８）とすることが好ましい。 Further, as shown in FIG. 1, the foreign matter capturing space 7 is formed so as to communicate with the groove bottom surface of the oil groove 4 opened at the circumferential end surface 2 b of the upper half bearing 2. In addition, the foreign matter that has entered the oil groove 4 of the upper half bearing 2 together with the lubricating oil proceeds to the front side in the relative rotational direction of the crankshaft 10 while rolling mainly on the groove bottom surface side of the oil groove 4, and It has been confirmed that at least in the region close to the circumferential end surface 2b corresponding to the front side in the relative rotational direction of the crankshaft 10, it flows through both ends in the width direction of the groove bottom surface of the oil groove 4. For this reason, as shown in FIG. 5, the foreign matter capturing space 7 is formed so as to communicate with at least both ends in the width direction of the groove bottom surface of the oil groove 4 opened at the circumferential end surface 2 b of the upper half bearing 2. It is preferable. The region communicating with the foreign matter capturing space 7 is 10% or more of the groove depth D2 from the groove bottom surface of the oil groove 4, and 10% of the groove width W2 of the groove bottom surface from each end in the width direction of the groove bottom surface of the oil groove 4. It is preferable to use the above region (the hatched region 8 shown in FIG. 5).

また、図１に示すように、異物捕捉空間７は、上半割軸受２の周方向端面２ｂで開口する油溝４の溝底面よりも下半割軸受３の外周面３ｄ側に向かって空間が広がるように形成されている。なお、上半割軸受２における油溝４の溝底面を転動しながらクランク軸１０の相対回転方向の前方側にあたる周方向端部に到達した異物には、周方向への慣性力とともに、すべり軸受１の半径方向への遠心力が作用している。このため、異物捕捉空間７は、異物に対する周方向への慣性力、及びすべり軸受１の半径方向への遠心力の作用方向に空間が広がっており、異物が異物捕捉空間７に捕捉されやすい。 Further, as shown in FIG. 1, the foreign matter capturing space 7 is a space from the groove bottom surface of the oil groove 4 opened at the circumferential end surface 2 b of the upper half bearing 2 toward the outer peripheral surface 3 d side of the lower half bearing 3. Is formed to spread. The foreign matter that has reached the circumferential end corresponding to the front side in the relative rotational direction of the crankshaft 10 while rolling on the bottom surface of the oil groove 4 in the upper half bearing 2 slides along with the inertial force in the circumferential direction. A centrifugal force in the radial direction of the bearing 1 is acting. For this reason, the foreign matter capturing space 7 is widened in the direction of the action of the inertia force in the circumferential direction with respect to the foreign matter and the centrifugal force in the radial direction of the slide bearing 1, and the foreign matter is easily captured in the foreign matter capturing space 7.

図３に示すように、軸線方向溝６は、すべり軸受１の円周方向や半径方向に直交する軸線方向に沿って形成されている。この軸線方向溝６は、下半割軸受３の周方向端面３ｂに一定の深さで切欠形成されると共に、その一方の端部が異物捕捉空間７と連通し、他方の端部が下半割軸受３の幅方向端面３ｃで開口するように形成されている。また、図６に示すように、軸線方向溝６の横断面形状は、Ｒ断面形状に形成されている。軸線方向溝６の横断面積が大きすぎると、すべり軸受１の外部へ漏れ出る潤滑油の量が多くなってしまうため、異物が通過可能な程度まで横断面積を小さくすることが好ましい。このため、軸線方向溝６の溝深さＤ３は、０．５ｍｍ以上２ｍｍ以下とし、軸線方向溝６の溝幅W３は、０．５ｍｍ以上２ｍｍ以下とすることが好ましい。 As shown in FIG. 3, the axial groove 6 is formed along the axial direction orthogonal to the circumferential direction and the radial direction of the plain bearing 1. The axial groove 6 is notched at a certain depth in the circumferential end surface 3b of the lower half bearing 3, and one end thereof communicates with the foreign matter capturing space 7, and the other end thereof is the lower half. The split bearing 3 is formed so as to open at the end surface 3c in the width direction. Moreover, as shown in FIG. 6, the cross-sectional shape of the axial direction groove | channel 6 is formed in R cross-sectional shape. If the cross-sectional area of the axial groove 6 is too large, the amount of lubricating oil leaking to the outside of the slide bearing 1 increases, so it is preferable to reduce the cross-sectional area to the extent that foreign matter can pass through. For this reason, the groove depth D3 of the axial groove 6 is preferably 0.5 mm or more and 2 mm or less, and the groove width W3 of the axial groove 6 is preferably 0.5 mm or more and 2 mm or less.

なお、第１実施形態における軸線方向溝６は、下半割軸受３の周方向端面３ｂのみに形成した例を示したが、軸線方向溝６と同じ溝を、上半割軸受２の周方向端面２ｂのみに、あるいは上半割軸受２及び下半割軸受３の両方の周方向端面２ｂ，３ｂに形成されてもよい。 In addition, although the axial direction groove | channel 6 in 1st Embodiment showed the example formed only in the circumferential direction end surface 3b of the lower half bearing 3, the groove | channel same as the axial direction groove | channel 6 was shown in the circumferential direction of the upper half bearing 2. It may be formed only on the end face 2 b or on the circumferential end faces 2 b and 3 b of both the upper half bearing 2 and the lower half bearing 3.

上記のように構成されるすべり軸受１は、油溝４を形成した上半割軸受２に対してクランク軸１０の相対回転方向の前方側にあたる組合せ面５ａにおいて、下半割軸受３の周方向端面３ｂ内に異物捕捉空間７及び軸線方向溝６が形成されているため、上半割軸受２における油溝４の溝底面を転動しながらクランク軸１０の相対回転方向の前方側にあたる周方向端部に到達した異物が、その周方向端部の溝底面と連通する異物捕捉空間７に捕捉されやすく、この異物捕捉空間７に捕捉された異物を、異物捕捉空間７と連通する軸線方向溝６を介して下半割軸受３の幅方向端面３ｃ側にスムーズに排出することができる。 The sliding bearing 1 configured as described above has a circumferential direction of the lower half bearing 3 on the combination surface 5a corresponding to the front side in the relative rotational direction of the crankshaft 10 with respect to the upper half bearing 2 in which the oil groove 4 is formed. Since the foreign matter capturing space 7 and the axial groove 6 are formed in the end surface 3b, the circumferential direction corresponding to the front side in the relative rotational direction of the crankshaft 10 while rolling the groove bottom surface of the oil groove 4 in the upper half bearing 2 The foreign matter that has reached the end is easily caught in the foreign matter catching space 7 that communicates with the groove bottom surface at the circumferential end, and the foreign matter caught in the foreign matter catching space 7 is communicated with the foreign matter catching space 7 in the axial groove. 6 can be smoothly discharged to the width direction end face 3c side of the lower half bearing 3.

また、異物捕捉空間７及び軸線方向溝６は、半割軸受２，３の内周面２ａ，３ａ側には開口させないので、クランク軸１０の回転によるすべり軸受１の摺動面とクランク軸１０の表面間での潤滑油の周方向への流れの影響を全く受けることがなく、異物捕捉空間７に捕捉された異物を、異物捕捉空間７と連通する軸線方向溝６を介して下半割軸受３の幅方向端面３ｃ側までスムーズに排出することができる。このように、第１実施形態に係るすべり軸受１においては、潤滑油に混入し油溝４に進入した異物を下半割軸受３の内周面３ａ側に巻き込むことがなく、すべり軸受１の摺動面に異物が混入することを防止することができる。 Further, since the foreign matter capturing space 7 and the axial groove 6 are not opened on the inner peripheral surfaces 2a and 3a side of the half bearings 2 and 3, the sliding surface of the sliding bearing 1 and the crankshaft 10 by the rotation of the crankshaft 10 are used. The foreign matter trapped in the foreign matter catching space 7 is not affected at all by the circumferential flow of the lubricating oil between the surfaces of the two parts, and the lower half is split through the axial groove 6 communicating with the foreign matter catching space 7. The bearing 3 can be smoothly discharged to the end surface 3c in the width direction. Thus, in the slide bearing 1 according to the first embodiment, the foreign matter mixed into the lubricating oil and entering the oil groove 4 is not caught on the inner peripheral surface 3a side of the lower half bearing 3, and the slide bearing 1 It is possible to prevent foreign matters from entering the sliding surface.

以上、第１実施形態に係るすべり軸受１を構成する下半割軸受３に１個の異物捕捉空間７が形成されるものについて説明したが、次に、請求項２に係る発明に対応する実施形態であって、下半割軸受３に２個の異物捕捉空間７が形成される第２実施形態について図７及び図８を参照して説明する。図７は、第２実施形態に係る下半割軸受３の平面図であり、図８は、第２実施形態に係るすべり軸受１における異物の排出メカニズムを説明するための拡大図である。なお、第１実施形態と同じ機能を奏する部材については、第１実施形態と同じ符号が付してある。 As described above, the description has been given of the case where the single foreign matter capturing space 7 is formed in the lower half bearing 3 constituting the sliding bearing 1 according to the first embodiment. Next, the embodiment corresponding to the invention according to claim 2 will be described. A second embodiment in which two foreign matter capturing spaces 7 are formed in the lower half bearing 3 will be described with reference to FIGS. FIG. 7 is a plan view of the lower half bearing 3 according to the second embodiment, and FIG. 8 is an enlarged view for explaining a foreign matter discharge mechanism in the slide bearing 1 according to the second embodiment. In addition, about the member which show | plays the same function as 1st Embodiment, the code | symbol same as 1st Embodiment is attached | subjected.

図７に示すように、第２実施形態におけるすべり軸受１を構成する上半割軸受２の周方向端面２ｂと下半割軸受３の周方向端面３ｂの当接面である両組合せ面５ａ，５ｂのうち、油溝４を形成した上半割軸受２に対してクランク軸１０の相対回転方向の前方側にあたる組合せ面５ａにおいて、上半割軸受２の周方向端面２ｂと当接する下半割軸受３の周方向端面３ｂ内には、異物捕捉空間７が２個形成されている。 As shown in FIG. 7, both combined surfaces 5a, which are contact surfaces of the circumferential end surface 2b of the upper half bearing 2 and the circumferential end surface 3b of the lower half bearing 3 constituting the slide bearing 1 in the second embodiment, 5b, the lower half of the combined surface 5a corresponding to the front side in the relative rotational direction of the crankshaft 10 with respect to the upper half bearing 2 in which the oil groove 4 is formed is in contact with the circumferential end surface 2b of the upper half bearing 2. Two foreign matter capturing spaces 7 are formed in the circumferential end surface 3 b of the bearing 3.

また、図８に示すように、２個の異物捕捉空間７は、上半割軸受２の周方向端面２ｂで開口する油溝４の溝底面の幅方向の両端部と各々連通するように形成されている。すなわち、上半割軸受２の周方向端面２ｂで開口する油溝４の溝底面の幅方向の各端部には、異物捕捉空間７及び軸線方向溝６からなる独立した異物の排出路が連通するように形成されている。このため、各々の異物捕捉空間７に捕捉された異物は、その異物捕捉空間７と連通する軸線方向溝６を介して下半割軸受３の幅方向端面３ｃ側にさらにスムーズに排出することができる。 Further, as shown in FIG. 8, the two foreign matter capturing spaces 7 are formed so as to communicate with both end portions in the width direction of the groove bottom surface of the oil groove 4 opened at the circumferential end surface 2 b of the upper half bearing 2. Has been. That is, an independent foreign matter discharge path including the foreign matter catching space 7 and the axial groove 6 is communicated with each end portion in the width direction of the groove bottom surface of the oil groove 4 opened at the circumferential end surface 2 b of the upper half bearing 2. It is formed to do. For this reason, the foreign matter caught in each foreign matter catching space 7 can be more smoothly discharged to the width direction end face 3 c side of the lower half bearing 3 through the axial groove 6 communicating with the foreign matter catching space 7. it can.

上記した第１実施形態においては、上半割軸受２における油溝４の溝深さを一定とするものについて説明したが、次に、請求項３に係る発明に対応する実施形態であって、上半割軸受２における油溝４の幅方向の中央部に対して幅方向の両端部の溝深さが深く形成される第３実施形態について図９乃至図１１を参照して説明する。図９は、第３実施形態に係る上半割軸受２の平面図であり、図１０は、第３実施形態に係る上半割軸受２の周方向端面２ｂに開口した油溝４の横断面図であり、図１１は、第３実施形態に係る上半割軸受２における油溝４の幅方向の両端部の溝深さを深く形成する範囲を説明するための上半割軸受２の側面図である。なお、第１実施形態及び第２実施形態と同じ機能を奏する部材については、これらの実施形態と同じ符号が付してある。 In the first embodiment described above, a description has been given of a case where the groove depth of the oil groove 4 in the upper half bearing 2 is constant. Next, an embodiment corresponding to the invention according to claim 3, A third embodiment in which the groove depths at both end portions in the width direction are formed deeper than the center portion in the width direction of the oil groove 4 in the upper half bearing 2 will be described with reference to FIGS. FIG. 9 is a plan view of the upper half bearing 2 according to the third embodiment, and FIG. 10 is a cross section of the oil groove 4 opened in the circumferential end surface 2b of the upper half bearing 2 according to the third embodiment. FIG. 11 is a side view of the upper half bearing 2 for explaining a range in which the groove depths at both ends in the width direction of the oil groove 4 in the upper half bearing 2 according to the third embodiment are deeply formed. FIG. In addition, about the member which show | plays the same function as 1st Embodiment and 2nd Embodiment, the same code | symbol as these embodiments is attached | subjected.

図９及び図１０に示すように、上半割軸受２に形成された油溝４は、円周方向の全体にわたって幅方向の中央部に対して幅方向の両端部の溝深さが深くなるように形成されている。上記したように、潤滑油とともに上半割軸受２の油溝４内に進入した異物は、少なくともクランク軸１０の相対回転方向の前方側にあたる周方向端面２ｂに近い領域において、油溝４の溝底面の幅方向の両端側を流れることが確認されている。このため、油溝４の幅方向の中央部に対して幅方向の両端部の溝深さを深くすると、油溝４内に進入した異物は、油溝４の溝底面の幅方向の両端部から逸脱しがたくなり、異物が異物捕捉空間７に捕捉されやすい。 As shown in FIGS. 9 and 10, the oil groove 4 formed in the upper half bearing 2 has a deeper groove depth at both ends in the width direction with respect to the center portion in the width direction over the entire circumferential direction. It is formed as follows. As described above, the foreign matter that has entered the oil groove 4 of the upper half bearing 2 together with the lubricating oil is a groove of the oil groove 4 at least in the region close to the circumferential end surface 2b on the front side in the relative rotation direction of the crankshaft 10. It has been confirmed that it flows at both ends in the width direction of the bottom surface. For this reason, when the groove depth at both ends in the width direction is deepened with respect to the center portion in the width direction of the oil groove 4, the foreign matter that has entered the oil groove 4 becomes both ends in the width direction of the groove bottom surface of the oil groove 4. Therefore, the foreign matter is easily trapped in the foreign matter capturing space 7.

また、図１１に示すように、上半割軸受２における幅方向の両端部の溝深さを深く形成する範囲については、円周方向の全体でなくてもよいが、クランク軸１０の相対回転方向の前方側にあたる上半割軸受２の周方向端面２ｂを基準とし、上半割軸受２の周方向の中央部側へ向かって少なくとも円周角度約２０°の範囲とすることが好ましい。この場合、油溝４は、クランク軸１０の相対回転方向の前方側にあたる上半割軸受２の周方向端面２ｂへ向かうほど、幅方向の中央部に対して幅方向の両端部の溝深さが徐々に深くなるように形成されており、異物が異物捕捉空間７に捕捉されやすい。 Further, as shown in FIG. 11, the range in which the groove depths at both ends in the width direction of the upper half bearing 2 are formed deep may not be the entire circumferential direction, but the relative rotation of the crankshaft 10 The circumferential end face 2b of the upper half bearing 2 corresponding to the front side in the direction is preferably set to a range of at least a circumferential angle of about 20 ° toward the central portion in the circumferential direction of the upper half bearing 2. In this case, the oil groove 4 has groove depths at both end portions in the width direction with respect to the center portion in the width direction as it goes toward the circumferential end surface 2b of the upper half bearing 2 that is on the front side in the relative rotation direction of the crankshaft 10. Are formed so as to be gradually deeper, and the foreign matter is easily captured in the foreign matter capturing space 7.

上記した第１実施形態においては、下半割軸受３の周方向端面３ｂ内に異物捕捉空間７及び軸線方向溝６が形成されるものについて説明したが、次に、請求項４に係る発明に対応する実施形態であって、下半割軸受３の周方向端面３ｂの外周面３ｄ側に軸線方向溝６が形成されるとともに異物捕捉空間７が開口する第４実施形態について図１２及び図１３を参照して説明する。図１２は、第４実施形態に係るすべり軸受１の側面図であり、図１３は、第４実施形態に係る下半割軸受３の平面図である。なお、第１実施形態乃至第３実施形態と同じ機能を奏する部材については、これらの実施形態と同じ符号が付してある。 In the first embodiment described above, the case where the foreign matter capturing space 7 and the axial groove 6 are formed in the circumferential end surface 3b of the lower half bearing 3 has been described. 12 and 13 corresponding to a fourth embodiment in which the axial groove 6 is formed on the outer peripheral surface 3d side of the circumferential end surface 3b of the lower half bearing 3 and the foreign matter capturing space 7 is opened. Will be described with reference to FIG. FIG. 12 is a side view of the plain bearing 1 according to the fourth embodiment, and FIG. 13 is a plan view of the lower half bearing 3 according to the fourth embodiment. In addition, about the member which show | plays the same function as 1st Embodiment thru | or 3rd Embodiment, the same code | symbol as these embodiments is attached | subjected.

図１２及び図１３に示すように、第４実施形態に係る軸線方向溝６は、下半割軸受３の周方向端面３ｂの外周面３ｄ側に形成されている。また、第４実施形態に係る異物捕捉空間７は、下半割軸受３の周方向端面３ｂの外周面３ｄ側に開口することにより、軸線方向溝６と連通するように形成されている。このような構成では、内燃機関の仕様により半割軸受２，３の肉厚（壁厚）が薄く設定される場合でも、下半割軸受３の周方向端面３ｂ内に異物捕捉空間７を形成するスペースを確保することができる。 As shown in FIGS. 12 and 13, the axial groove 6 according to the fourth embodiment is formed on the outer peripheral surface 3 d side of the circumferential end surface 3 b of the lower half bearing 3. In addition, the foreign matter capturing space 7 according to the fourth embodiment is formed so as to communicate with the axial groove 6 by opening on the outer peripheral surface 3 d side of the circumferential end surface 3 b of the lower half bearing 3. In such a configuration, even when the thickness (wall thickness) of the half bearings 2 and 3 is set to be thin according to the specifications of the internal combustion engine, the foreign matter capturing space 7 is formed in the circumferential end surface 3b of the lower half bearing 3. Space can be secured.

なお、第４実施形態に係る軸線方向溝６は、下半割軸受３の周方向端面３ｂの外周面３ｄ側のみに形成した例を示したが、軸線方向溝６と同じ溝を、上半割軸受２の周方向端面２ｂの外周面２ｄ側のみに、あるいは上半割軸受２及び下半割軸受３の両方の周方向端面２ｂ，３ｂの外周面２ｄ，３ｄ側に形成されてもよい。 In addition, although the example in which the axial groove 6 according to the fourth embodiment is formed only on the outer peripheral surface 3d side of the circumferential end surface 3b of the lower half bearing 3 is shown, the same groove as the axial groove 6 is formed in the upper half It may be formed only on the outer peripheral surface 2d side of the circumferential end surface 2b of the split bearing 2 or on the outer peripheral surfaces 2d, 3d side of the circumferential end surfaces 2b, 3b of both the upper half bearing 2 and the lower half bearing 3. .

また、第４実施形態に係る異物捕捉空間７は、第１実施形態と同じく下半割軸受３に１個の異物捕捉空間７を形成した例を示したが、第２実施形態と同じく下半割軸受３に２個の異物捕捉空間７が形成されてもよい。 Moreover, although the foreign material capture | acquisition space 7 which concerns on 4th Embodiment showed the example which formed the 1 foreign material capture | acquisition space 7 in the lower half bearing 3 similarly to 1st Embodiment, it is the lower half same as 2nd Embodiment. Two foreign matter capturing spaces 7 may be formed in the split bearing 3.

なお、以上説明した全ての実施形態においては、異物捕捉空間７や軸線方向溝６が、油溝４を形成する上半割軸受２に対してクランク軸１０の相対回転方向の前方側にあたる上半割軸受２と下半割軸受３の組合せ面５ａのみに形成されたが、油溝４を形成する上半割軸受２に対してクランク軸１０の相対回転方向の後方側にあたる組合せ面５ｂにも、軸受中心線に対し線対称的に形成されてもよい。これによれば、異物捕捉空間７及び軸線方向溝６が、油溝４を形成した上半割軸受２に対してクランク軸１０の相対回転方向の後方側にあたる上半割軸受２と下半割軸受３の組合せ面５ｂのみに位置するように誤って組み付けられることを防ぐことができる。 In all the embodiments described above, the foreign material capturing space 7 and the axial groove 6 are in the upper half corresponding to the front side in the relative rotational direction of the crankshaft 10 with respect to the upper half bearing 2 forming the oil groove 4. Although formed only on the combination surface 5a of the split bearing 2 and the lower half bearing 3, the combination surface 5b corresponding to the rear side in the relative rotational direction of the crankshaft 10 with respect to the upper half bearing 2 forming the oil groove 4 is also provided. Further, it may be formed symmetrically with respect to the bearing center line. According to this, the upper half bearing 2 and the lower half of the foreign matter capturing space 7 and the axial groove 6 are located on the rear side in the relative rotational direction of the crankshaft 10 with respect to the upper half bearing 2 in which the oil groove 4 is formed. It is possible to prevent erroneous assembly so as to be located only on the combination surface 5b of the bearing 3.

また、全ての実施形態においては、油溝４の溝深さや溝幅について、上半割軸受２の周方向の全体にわたって一定としたが、上半割軸受２の周方向で変化するように形成してもよい。また、油溝４は、上半割軸受２の周方向端面２ｂの両端面に開口させているが、クランク軸１０の相対回転方向の後方側にあたる周方向端面２ｂには必ずしも開口させなくてもよい。また、異物捕捉空間７及び軸線方向溝６の断面形状は、それぞれ断面矩形状、断面Ｒ形状に形成されているが、潤滑油中の異物の捕捉や排出が可能な限りにおいて制約はない。 In all the embodiments, the groove depth and groove width of the oil groove 4 are constant over the entire circumferential direction of the upper half bearing 2, but are formed so as to change in the circumferential direction of the upper half bearing 2. May be. The oil grooves 4 are opened on both end surfaces of the circumferential end surface 2b of the upper half bearing 2, but are not necessarily opened on the circumferential end surface 2b corresponding to the rear side in the relative rotational direction of the crankshaft 10. Good. Moreover, although the cross-sectional shape of the foreign material capture | acquisition space 7 and the axial direction groove | channel 6 is each formed in the cross-sectional rectangular shape and the cross-sectional R shape, there is no restriction | limiting as long as the foreign material in lubricating oil can be capture | acquired and discharge | emissioned.

さらに、本発明のすべり軸受１においては、従来の内燃機関用のすべり軸受１と同じく、半割形状軸受２，３の内周面２ａ．３ａ側の周方向端部にはクラッシュリリーフ（ＳＡＥＪ５０６（項目３．２６、項目６．４参照）、ＤＩＮ１４９７（セクション３．２）、ＪＩＳＤ３１０２（項目２．４）で規定されている）や面取り等を形成してもよい。 Furthermore, in the sliding bearing 1 of the present invention, the inner peripheral surfaces 2a.2 of the half-shaped bearings 2, 3 are the same as the sliding bearing 1 for a conventional internal combustion engine. Crash relief (defined in SAE J506 (see item 3.26, item 6.4), DIN1497 (section 3.2), JIS D3102 (item 2.4)) and the circumferential end on the 3a side, A chamfer or the like may be formed.

１すべり軸受
２上半割軸受
３下半割軸受
４油溝
４ａ供給穴
５ａ，５ｂ組合せ面
６軸線方向溝
７異物捕捉空間
８連通領域
１０クランク軸 DESCRIPTION OF SYMBOLS 1 Slide bearing 2 Upper half bearing 3 Lower half bearing 4 Oil groove 4a Supply hole 5a, 5b Combination surface 6 Axial groove 7 Foreign material capture space 8 Communication area 10 Crankshaft

Claims

内燃機関のクランク軸を支持するように一対の半割軸受を組み合わせて円筒形となり、前記一対の半割軸受のうち、少なくとも内周面に周方向に沿った油溝が形成された第１の半割軸受に対して前記クランク軸の相対回転方向の前方側にあたる周方向端面に前記油溝が開口するように形成されたすべり軸受において、
前記一対の半割軸受の組合せ面のうち、前記第１の半割軸受に対して前記クランク軸の相対回転方向の前方側にあたる組合せ面において、前記油溝が形成されない第２の半割軸受の周方向端面には、前記油溝内を流れる異物を捕捉可能な異物捕捉空間が、前記一対の半割軸受の内周面には開口することなく、前記油溝の開口の少なくとも溝底面側の幅方向の両端部と連通するように形成され、
前記第１の半割軸受および／または前記第２の半割軸受の周方向端面には、前記周方向に直交する軸線方向に沿った軸線方向溝が、前記一対の半割軸受の内周面には開口することなく、前記一対の半割軸受の幅方向端面に開口すると共に、前記異物捕捉空間と連通するように形成されることを特徴とするすべり軸受。 A pair of half bearings are combined so as to support a crankshaft of an internal combustion engine to form a cylindrical shape, and at least one of the pair of half bearings has an oil groove extending in a circumferential direction on an inner circumferential surface. In the slide bearing formed so that the oil groove is opened in the circumferential end surface corresponding to the front side in the relative rotational direction of the crankshaft with respect to the half bearing,
Of the combination surfaces of the pair of half bearings, the second half bearing in which the oil groove is not formed on the combination surface corresponding to the front side in the relative rotation direction of the crankshaft with respect to the first half bearing. On the circumferential end surface, a foreign matter catching space capable of catching foreign matter flowing in the oil groove does not open on the inner peripheral surfaces of the pair of half bearings, and at least on the groove bottom surface side of the oil groove opening. Formed to communicate with both ends in the width direction,
An axial groove along an axial direction orthogonal to the circumferential direction is provided on an end surface in the circumferential direction of the first half bearing and / or the second half bearing, and an inner circumferential surface of the pair of half bearings. The sliding bearing is characterized in that it is formed so as to open to the widthwise end faces of the pair of half bearings and to communicate with the foreign matter capturing space without opening.

前記第２の半割軸受の周方向端面には、前記油溝の開口の溝底面側の幅方向の両端部と各々連通する前記異物捕捉空間が２個形成されることを特徴とする請求項１記載のすべり軸受。 2. The two foreign matter capturing spaces respectively communicating with both end portions in the width direction on the groove bottom surface side of the opening of the oil groove are formed on a circumferential end surface of the second half bearing. The plain bearing according to 1.

前記異物捕捉空間は、前記油溝の開口の溝底面よりも前記第２の半割軸受の外周面側に向かって空間が広がるように形成されることを特徴とする請求項１又は請求項２に記載のすべり軸受。 3. The foreign matter capturing space is formed such that the space is expanded from the groove bottom surface of the opening of the oil groove toward the outer peripheral surface side of the second half bearing. The plain bearing described in 1.

前記第１の半割軸受に対して前記クランク軸の相対回転方向の前方側にあたる周方向端面に近い領域において、前記油溝は、幅方向の中央部側に対して幅方向の両端部の溝深さが深く形成されることを特徴とする請求項１乃至請求項３のいずれかに記載のすべり軸受。 In the region near the circumferential end surface corresponding to the front side in the relative rotation direction of the crankshaft with respect to the first half bearing, the oil groove is a groove at both end portions in the width direction with respect to the center portion side in the width direction. The slide bearing according to any one of claims 1 to 3, wherein the depth is formed deep.

前記軸線方向溝は、前記第１の半割軸受および／または前記第２の半割軸受の周方向端面の外周面側に沿って形成されることを特徴とする請求項１乃至請求項４のいずれかに記載のすべり軸受。 The axial groove is formed along an outer peripheral surface side of a circumferential end surface of the first half bearing and / or the second half bearing. A plain bearing according to any one of the above.