Anti-misloading and friction-reducing thrust plate

Abstract

The utility model discloses a thrust plate capable of preventing misloading and reducing friction, which comprises two semi-annular thrust plate bodies with the same structure, an oil groove is arranged on the thrust surface of each thrust plate body, the oil groove is of a semi-closed structure, and the open end of the oil groove is positioned on the inner arc surface of each thrust plate body; the opening width and the opening depth of the oil groove are gradually reduced along the outer edge direction of the thrust plate body; the cross section of the oil groove is wedge-shaped, and when the crankshaft rotates, the gap of the oil groove is gradually reduced in the tangential direction of forward rotation of the crankshaft. According to the utility model, engine oil can reversely push the crankshaft through the wedge effect, so that the crankshaft and a thrust plate kinematic pair are incompletely contacted, a layer of oil film is quickly formed between the crankshaft and the thrust plate kinematic pair, and the friction work is reduced; and meanwhile, redundant flowing-out engine oil can take away friction heat generated between the thrust surface of the crankshaft and the thrust plate, so that the cooling effect is achieved, and the reliability and economical efficiency of the engine are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine parts, in particular to a mistake proofing and friction reducing thrust washer. BACKGROUND

[0002] Thrust washer is the engine part matched with the crankshaft, and its function is to control the axial displacement of the crankshaft. At present, the thrust washer is designed with two different pieces of upper and lower, or the scheme of thrust and bearing bush integrated, or the scheme of not distinguishing the structure of upper and lower thrust washers. The first kind of thrust washer is two different pieces of upper and lower, and the structural difference of the upper and lower two pieces is not obvious, which may be mixed and assembled. The second kind of scheme of thrust and bearing bush integrated has high cost and complicated production. The third kind of structure of not distinguishing the upper and lower thrust washers relies on the identification of workers during assembly, and has high requirement for workers and is easy to be assembled incorrectly. If any piece of thrust washer is assembled incorrectly without oil storage surface towards the crankshaft, the oil of the crankshaft thrust movement pair will be lack, the wear will be aggravated, the axial transmission will be too large, the cylinder will be pulled, and even the connecting rod will be bent and broken, and the engine will be scrapped.

[0003] The patent with the publication number "CN204628255U" discloses a crankshaft thrust washer and a crankshaft thrust washer mounting structure, adopts the structure of not distinguishing the upper and lower thrust washers, adopts the structure scheme of matching upper and lower bushes, and avoids the situation of two bushings being assembled reversely. However, in actual use, the sliding friction exists between the thrust washer and the crankshaft, and the oil groove has large friction work loss.

[0004] The information disclosed in the above background section is only for increasing the understanding of the overall background of the utility model, and should not be regarded as acknowledging or implying in any form that the information constitutes the prior art known to those skilled in the art. CONTENT OF THE UTILITY MODEL

[0005] In view of the above existing defects, the utility model aims at providing a mistake proofing and friction reducing thrust washer, designing a wedge-shaped oil groove structure, which can effectively reduce the friction loss and heat dissipation, and improve the reliability and economy of the engine.

[0006] The technical scheme of the utility model is as follows:

[0007] A mistake proofing and friction reducing thrust washer is used for axial cooperation with a crankshaft, which comprises two pieces of semicircular thrust washer bodies with the same structure, a positioning pin hole is arranged on the thrust washer body, an oil groove is arranged on the thrust surface of the thrust washer body, the oil groove is a semi-closed structure, and the opening end is located on the inner arc surface of the thrust washer body, the opening width and depth of the oil groove gradually decrease along the outer edge direction of the thrust washer body, the cross section of the oil groove is wedge-shaped, and the gap of the oil groove gradually decreases along the tangent direction of the positive rotation of the crankshaft when the crankshaft rotates.

[0008] Specifically, the number of oil grooves of each thrust plate body is two, which are arranged in parallel on both sides of the thrust plate body.

[0009] Specifically, the two end portions of the thrust plate body are provided with limiting protrusions in the extending direction, the top surface of the limiting protrusions is lower than the thrust surface of the thrust plate body, and the two limiting protrusions are arranged on the inner side of one end and the outer side of the other end of the thrust plate body respectively and offset from the center line of each end.

[0010] Specifically, the limiting protrusions are arc-shaped structures, and the arc shape is S-shaped.

[0011] The utility model discloses the beneficial effect:

[0012] 1, the scheme is designed in the thrust piece front surface circumference and radial direction multiple oil groove structure of the section wedge, when the engine runs, the oil covers the whole thrust piece through the wedge oil groove, and the wedge effect can make the oil counter -propulsion crankshaft, can let the crankshaft and thrust piece pair not contact completely, and a layer of oil film is formed between the two, reduces the friction work, simultaneously, the friction heat generated between the crankshaft thrust surface and the thrust piece is also taken away by the excess oil, thereby reaches the cooling effect, improves the reliability and economy of the engine.

[0013] 2, the combination mode of the positioning pin hole and the limiting protrusion is used, and the obvious appearance identification feature is used, so that there is only one assembly result of the thrust piece, the assembly is avoided, and the structure is simple and the cost is low. DRAWINGS

[0014] Figure 1 It is a front view of the thrust piece of the utility model of preventing mistake and reducing friction.

[0015] Figure 2 It is an axial view of the thrust piece of the utility model of preventing mistake and reducing friction.

[0016] Figure 3 It is a mounting schematic view of the thrust piece of the utility model of preventing mistake and reducing friction.

[0017] Figure 4 It is Figure 1 It is a sectional view of D-D.

[0018] Figure 5 It is Figure 1 It is a sectional view of A-A.

[0019] In the drawing, 1 is a thrust plate body, 2 is a crankshaft, 3 is a positioning pin hole, 4 is a thrust surface, 5 is an oil groove, and 6 is a limiting protrusion. DETAILED DESCRIPTION

[0020] In order to describe the technical content, the purposes and effects of the present application in detail, the following will be described in combination with the embodiments and the accompanying drawings. In the description of the embodiments, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0021] According to the specific embodiment of the present application, the thrust piece is provided with two half-ring-shaped thrust piece bodies 1 which are the same in structure, a positioning pin hole 3 is arranged on the thrust piece body 1, which is used for axial cooperation with the crankshaft 2, the front surface is a thrust surface, the back surface is a smooth surface, the thrust surface is attached to one side of the crankshaft during assembly, the back surface is attached to the main bearing cover of the engine body, and the axial displacement of the crankshaft 2 is controlled.

[0022] The key point of the present embodiment is that an oil groove 4 is arranged on the thrust surface 4 of the thrust piece body 1, the number of the oil groove 4 is two, and the two oil grooves are arranged on the two sides of the thrust piece body 1 in parallel with each other. The oil groove 5 is a semi-closed structure, and the opening end is located on the inner arc surface of the thrust piece body 1; the opening width and depth of the oil groove 4 gradually decrease along the outer edge direction of the thrust piece body 1; when the crankshaft 2 rotates, the oil groove stores the lubricating oil overflowing from the crankshaft and bearing pair, continuously provides lubrication for the thrust piece and the crankshaft pair, and as the crankshaft rotates, the radial flow direction of the oil along the end direction of the oil groove, as shown in Figure 4 , the solid arrow indicates the flow direction of the oil, the thrust force generated by the compression effect acts on the crankshaft surface, and the dotted arrow indicates the thrust direction, so that the crankshaft and the thrust piece pair are not in complete contact; the cross section of the oil groove 5 is wedge-shaped, and when the crankshaft 2 rotates, the gap of the oil groove 5 gradually decreases along the tangent direction of the positive rotation of the crankshaft 2, as shown in Figure 5 , the large arrow indicates the rotation direction of the crankshaft 2, the small solid arrow indicates the flow direction of the oil, and the small dotted arrow indicates the thrust direction, so that when the crankshaft 2 rotates, the circumferential flow direction of the oil along the direction of the small gap of the oil groove 5, the same wedge effect generates a thrust force on the surface of the crankshaft 2, and a layer of oil film is quickly formed between the two, reducing the friction work; at the same time, the excess oil flowing out also carries away the friction heat generated between the thrust surface 4 of the crankshaft 2 and the thrust piece, thereby achieving the effect of cooling, improving the reliability and economy of the engine.

[0023] As a preferred technical solution of the present embodiment, limit protrusions 6 are arranged at both ends of the thrust piece body 1 in the extension direction, the top surface of the limit protrusion 6 is lower than the thrust surface 4 of the thrust piece body 1, and the two limit protrusions 6 are respectively arranged on the inner side of one end and the outer side of the other end of the thrust piece body 1 with the center line of each end as the center. Figure 2 , 3As shown, the positioning pin hole 3 designed on the thrust plate body 1 corresponds to the positioning pin hole of the front and rear ends of the main bearing cover, and the thrust plate body 1 can be ensured to be installed on the main bearing cover in only one way through the positioning pin. Meanwhile, the thrust plate body 1 is designed with one limiting protrusion 6 at each of the two radial ends, and the two limiting protrusions 6 are in an asymmetric structure. The two limiting protrusions 6 can be matched with each other, that is, when the two straight thrust plates are assembled in an up-down manner, a circular annular thrust surface can be formed. In this way, the up-down thrust plates can be used in common when the thrust plate is installed, and only one assembly result of the thrust plate can be ensured, so that the thrust plate is not installed reversely, and the structure is simple and the cost is low. In addition, the limiting of the thrust plate body 1 is a concave surface, and after the two thrust plates are matched, a radial concave groove with an oil storage function is formed. Through the position recognition of the oil storage groove 2 and the limiting protrusion 6, the thrust plate can be correctly assembled. If the lower thrust plate is installed reversely due to negligence, the main bearing cover cannot be assembled with the cover, so that the purpose of prompting and preventing the thrust plate from being installed incorrectly is achieved.

[0024] Figure 3 As shown, the limiting protrusion 6 is in an arc structure, and the arc is an S-shaped arc, that is, the front is large and the rear is small, so that the corresponding limiting protrusions 6 of the two half-ring thrust plate bodies 1 can be limited and matched when the two half-ring thrust plate bodies 1 are combined relative to each other.

[0025] Although the utility model has been described in detail in the above embodiment, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model all belong to the scope of protection required by the utility model.

Claims

1. A mistake-proof and friction-reducing thrust plate for axial cooperation with a crankshaft (2), comprising two semicircular thrust plate bodies (1) of the same structure, and a positioning pin hole (3) is arranged on the thrust plate body (1), characterized in that: an oil groove (5) is arranged on the thrust surface (4) of the thrust plate body (1), the oil groove (5) is of a semi-closed structure, and the opening end is located on the inner arc surface of the thrust plate body (1); the opening width and depth of the oil groove (5) gradually decrease along the outer edge direction of the thrust plate body (1); the cross section of the oil groove (5) is wedge-shaped, and the gap of the oil groove (5) gradually decreases along the tangent direction of the positive rotation of the crankshaft (2) when the crankshaft (2) rotates; limit protrusions (6) are arranged on both ends of the thrust plate body (1) in the extension direction, the top surface of the limit protrusion (6) is lower than the thrust surface (4) of the thrust plate body (1), and the two limit protrusions (6) are respectively arranged on the inner side of one end and the outer side of the other end of the thrust plate body (1) with each end center as the center; the limit protrusion (6) is of an arc structure, and the arc is S-shaped. The number of oil grooves (5) of each thrust plate body (1) is two, which are respectively arranged on both sides of the thrust plate body (1) in parallel. ​ ​ ​ 2. The mistake proofing and friction reducing thrust washer of claim 1, wherein: ​

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