阅读说明：本技术 一种活塞销轴承辅助进油结构 (Auxiliary oil inlet structure of piston pin bearing ) 是由 张利敏 刘旭康 袁晓帅 刘玉婷 高丽英 强慧 于 2021-09-17 设计创作，主要内容包括：本发明提供了一种活塞销轴承辅助进油结构,连杆孔与活塞上的第一活塞销座孔和第二活塞销座孔通过活塞销形成转动副连接,连杆小头与活塞销座之间存在间隙,在与上述间隙同位置的活塞销外壁上设有第一螺旋沟槽、第二螺旋沟槽,连杆小头孔内安装连杆衬套,本发明所述的一种活塞销轴承辅助进油结构,通过在活塞销上设置第一螺旋沟槽和第二螺旋沟槽,来辅助连杆孔及第一活塞销座孔、第二活塞销座孔进油,保证轴承润滑油量充足,减少由于润滑冷却不足导致的活塞销轴承温度升高,同时降低活塞销轴承磨损。(The invention provides an auxiliary oil inlet structure of a piston pin bearing, wherein a connecting rod hole is connected with a first piston pin seat hole and a second piston pin seat hole on a piston through a piston pin in a rotating pair mode, a gap exists between a small end of the connecting rod and a piston pin seat, a first spiral groove and a second spiral groove are formed in the outer wall of the piston pin at the same position as the gap, and a connecting rod bushing is installed in the small end hole of the connecting rod.)

1. The utility model provides a supplementary oil feed structure of piston pin bearing, its characterized in that: including top-down and piston (1) of an organic whole structure, piston pin boss (5) both sides are equipped with the first piston pin boss hole (41) that the structure is the same respectively, second piston pin boss hole (42), first piston pin boss hole (41) and second piston pin boss hole (42) are coaxial, the bush hole in connecting rod microcephaly (2) forms revolute pair with first piston pin boss hole (41) and second piston pin boss hole (42) through piston pin (3) and is connected, there is the clearance between connecting rod microcephaly (2) and piston pin boss (5), be equipped with first helical groove (6) on piston pin (3) outer wall with above-mentioned clearance homoposition, second helical groove (7).

2. The piston pin bearing auxiliary oil feed structure of claim 1, wherein: a first taper angle (81) and a second taper angle (82) are respectively arranged at two ends of a connecting rod bushing (8) which is arranged in the connecting rod small end (2) in an interference manner, and the taper angle does not exceed 5 degrees.

3. The piston pin bearing auxiliary oil feed structure of claim 2, wherein: the inner wall of the first piston pin seat hole (41) is provided with a first circular groove used for being clamped with a first positioning ring, the inner wall of the second piston pin seat hole (42) is provided with a second circular groove used for being clamped with a second positioning ring, and the inner wall of the bottom end of the first positioning ring and the inner wall of the bottom end of the second positioning ring are respectively contacted with two end faces of the piston pin (3).

Technical Field

The invention belongs to the technical field of piston pin bearings, and particularly relates to an auxiliary oil inlet structure of a piston pin bearing.

Background

The high-strength diesel engine piston pin bearing has the advantages that the working environment is severe, the bearing specific pressure is large, the relative speed is low, oil films are difficult to form, the bearing is limited by a high compact structure, the bearing mostly adopts a cooling nozzle to realize the splash lubrication and the impact cooling of a connecting rod small end, a floating piston pin in the piston pin bearing reciprocates along the axis of a cylinder under the action of combustion pressure and inertia force to form a pumping effect in a bearing hole, engine oil gathered at the end part of a connecting rod bush is sucked into the bearing to realize the engine oil exchange and lubrication, but in the actual work of the bearing, the randomness of the engine oil stock at the two ends of the connecting rod bush is very large, and the stable oil amount cannot be ensured.

Disclosure of Invention

In view of this, the invention aims to provide an auxiliary oil inlet structure for a piston pin bearing, so as to improve the supply and storage of engine oil at two ends of a connecting rod bushing and ensure safe and reliable continuous operation of the bearing.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the utility model provides an oil feed structure is assisted to piston pin bearing, including the piston of top-down and a body structure, the piston pin boss, piston pin boss both sides are equipped with the first piston pin boss hole that the structure is the same respectively, second piston pin boss hole, first piston pin boss hole and second piston pin boss hole are coaxial, the bush hole in the connecting rod microcephaly forms revolute pair with first piston pin boss hole and second piston pin boss hole through the piston pin and is connected, there is the clearance between connecting rod microcephaly and the piston pin boss, be equipped with first helical groove on the piston pin outer wall with above-mentioned clearance homoposition, second helical groove.

Furthermore, a first taper angle and a second taper angle are respectively arranged at two ends of a connecting rod bushing which is arranged in the small end of the connecting rod in an interference manner, and the taper angle is not more than 5 degrees.

Furthermore, the inner wall of the first piston pin boss hole is provided with a first ring groove used for clamping a first positioning ring, the inner wall of the second piston pin boss hole is provided with a second ring groove used for clamping a second positioning ring, and the inner wall of the bottom end of the first positioning ring and the inner wall of the bottom end of the second positioning ring are respectively contacted with two end faces of the piston pin.

Compared with the prior art, the auxiliary oil inlet structure of the piston pin bearing has the following beneficial effects:

(1) according to the auxiliary oil inlet structure for the piston pin bearing, the first spiral groove and the second spiral groove are formed in the piston pin to assist the connecting rod hole, the first piston pin seat hole and the second piston pin seat hole, so that the sufficient lubricating oil quantity of the bearing is ensured, the temperature rise of the piston pin bearing caused by insufficient lubricating and cooling is reduced, and meanwhile, the abrasion of the piston pin bearing is reduced.

(2) According to the piston pin bearing auxiliary oil inlet structure, the first taper angle and the second taper angle are not in contact with a piston pin, and the first taper angle and the second taper angle are used for having the functions of collecting and storing oil.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a cross-sectional view of a piston pin bearing auxiliary oil intake structure according to an embodiment of the present invention;

FIG. 2 is a schematic view of a piston pin according to an embodiment of the invention;

fig. 3 is an assembled sectional view of a connecting rod small end and a connecting rod bushing according to an embodiment of the present invention.

Description of reference numerals:

1-a piston; 2-connecting rod small end; 3-a piston pin; 41-first piston pin boss hole; 42-a second loose pin seat hole; 5-piston pin boss; 6-a first spiral groove; 7-a second spiral groove; 8-connecting rod bushing; 81-a first cone angle; 82-second taper angle.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

As shown in fig. 1-3, a piston pin bearing auxiliary oil feed structure includes: the piston comprises a piston 1 and a piston pin boss 5 which are integrally structured from top to bottom, wherein a first piston pin boss hole 41 and a second piston pin boss hole 42 which are identical in structure are respectively arranged at two sides of the piston pin boss 5, the first piston pin boss hole 41 and the second piston pin boss hole 42 are coaxial, a bushing hole in a connecting rod small head 2 is connected with the first piston pin boss hole 41 and the second piston pin boss hole 42 through a rotating pair formed by a piston pin 3, a gap exists between the connecting rod small head 2 and the piston pin boss 5, a first spiral groove 6 and a second spiral groove 7 are arranged on the outer wall of the piston pin 3 which is at the same position with the gap (the first spiral groove 6 and the second spiral groove 7 on the piston pin 3 can increase the number and the angle of the spiral grooves by adjusting pitch and spiral angle parameters according to different gaps), the first spiral groove 6 and the second spiral groove 7 are symmetrical relative to the central position of the outer side wall of the piston pin 3, through set up first helical groove 6 and second helical groove 7 on piston pin 3, come supplementary connecting rod stub axle and first piston pin shaft hole 41, second piston pin shaft hole 42, guarantee that the bearing lubricating oil volume is sufficient, reduce the piston pin bearing temperature rise that leads to owing to the lubricated cooling is not enough, reduce piston pin bearing wearing and tearing simultaneously.

As shown in fig. 1 and 3, the connecting rod small end 2 has a through hole therein, the inner diameter of the through hole is the same as the inner diameter of the first piston pin seat hole 41, and is coaxial, the connecting rod bushing 8 has a circular ring structure, the connecting rod bushing 8 is connected to the inner wall of the through hole in an interference manner, the inner diameter of the inner ring of the connecting rod bushing 8 is smaller than the inner diameter of the first piston pin seat hole 41, the two ends of the connecting rod bushing 8 are respectively provided with a first taper angle 81 and a second taper angle 82, the first taper angle 81 and the second taper angle 82 do not contact with the piston pin 3, and the first taper angle 81 and the second taper angle 82 are used for having the functions of oil collection and storage.

As shown in fig. 1, the inner wall of the first piston pin hole 41 is provided with a first ring groove for clamping the first positioning ring, the inner wall of the second piston pin hole 42 is provided with a second ring groove for clamping the second positioning ring, and the inner wall of the bottom end of the first positioning ring and the inner wall of the bottom end of the second positioning ring respectively contact with the two end faces of the piston pin 3 to form a thrust action on the piston pin 3.

The working principle of the invention is as follows: the splashed lubricating oil can be input to the connecting rod small end 2 and the edges of the first piston pin base hole 41 and the second piston pin base hole 42 through the first spiral groove 6 and the second spiral groove 7 at the two ends of the piston pin 3 by the rotation of the piston pin 3, and the auxiliary oil feeding lubrication effect is realized.

The wedge-shaped spaces sandwiched by the first taper angle 81 and the second taper angle 82 on the connecting rod bushing 8 and the piston pin 3, respectively, can constantly collect the oil sprayed onto the surface of the piston pin 3, and the collected oil can be temporarily stored in the aforementioned wedge-shaped spaces.

In the motion process of the piston pin bearing, engine cooling nozzles spray engine oil to a piston bottom cavity and fall by gravity, a small amount of engine oil can be sprayed and attached to a position, corresponding to a gap formed between a small connecting rod head 2 and a piston pin seat 5, of a piston pin 3, on one hand, the piston pin 3 can axially rotate under the action of friction force of the small connecting rod head 2 and the piston pin seat 5, on the other hand, the piston pin 3 reciprocates along the piston 1, the piston pin 3 is driven by the small connecting rod head 2, so that the piston pin 3 can move up and down in the axis direction of a connecting rod hole in the connecting rod hole (because the outer diameter of an outer ring on the side of the piston pin 3 is smaller than the inner diameter of a first piston pin seat hole 41, gaps are formed between the small connecting rod head 2 and the inner wall of the connecting rod hole), a pumping effect is formed, in order to strengthen the pumping effect of the piston pin bearing, a first spiral groove 6 and a second spiral groove 7 are arranged on the piston pin 3, and the piston pin 3 continuously conveys the lubricating oil stored in the first spiral groove 6 and the second spiral groove 7 to the small connecting rod head through axial rotation in the work process of the piston pin 3 The two ends of the oil cylinder 2 and the inner sides of the first piston pin hole 41 and the second piston pin hole 42 suck the engine oil into the bearing under the pumping action, and the auxiliary oil inlet effect is realized.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.