CN212717604U

CN212717604U - Crankshaft thrust structure and engine

Info

Publication number: CN212717604U
Application number: CN202021199253.3U
Authority: CN
Inventors: 王兰; 修磊; 刘培杰; 张鹏程; 宋林萍
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2021-03-16
Anticipated expiration: 2030-06-24

Abstract

The utility model relates to the field of engines, and discloses a crankshaft thrust structure and engine, the crankshaft thrust structure includes main bearing seat, main bearing cap and thrust plate, the thrust plate includes semicircular thrust body, and locates the terminal portion at thrust body opening both ends, two terminal portions and thrust body integrated into one piece form the thrust plate of U-shaped structure, the central angle that the thrust plate corresponds is greater than 180 and less than or equal to 235 degrees; the thrust body is abutted against the inner wall of the main bearing cover and is positioned with the main bearing cover through the positioning pin, and the two tail end parts are abutted against the inner wall of the main bearing seat. The utility model adopts the thrust plate with the U-shaped structure, and the central angle corresponding to the thrust plate is more than 180 degrees and less than or equal to 235 degrees, so that the space is reasonably utilized, compared with a full-circle thrust structure, the number of the thrust plate is reduced, the assembly efficiency is improved, and the processing cost is reduced; compared with a semicircular thrust structure, the positioning mode is simple by positioning the thrust plate and the main bearing cap by the positioning pin.

Description

Crankshaft thrust structure and engine

Technical Field

The utility model relates to an engine field especially relates to a bent axle thrust structure and engine.

Background

The thrust surface of the engine crankshaft is provided with a thrust structure, and the thrust structure is used for providing axial limit for the crankshaft and preventing the crankshaft from axially moving.

The current thrust plate is generally divided into a semicircular thrust structure and a full-circle thrust structure, wherein the semicircular thrust structure is generally a flanged bearing shell or a semicircular thrust plate and is installed on a main bearing seat. The flanged bearing bush has the advantages that the processing technology is complex, the cost is high, when the semicircular thrust plate is arranged on the main bearing seat, in order to prevent the semicircular thrust plate from rotating, a thrust groove needs to be processed on the main bearing seat, and the complexity and the processing cost of the main bearing seat are increased.

The whole-circle thrust structure comprises an upper thrust plate and a lower thrust plate, two whole-circle thrust structures need to be arranged on one diesel engine, namely the two upper thrust plates and the two lower thrust plates are needed, the assembling procedures are multiple, and the cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a bent axle thrust structure and engine can reduce the use quantity of thrust piece, simplifies the locate mode, improves assembly efficiency.

To achieve the purpose, the utility model adopts the following technical proposal:

a crankshaft thrust structure comprises a main bearing seat, a main bearing cap and thrust plates, wherein each thrust plate comprises a semicircular thrust body and end parts arranged at two ends of an opening of the thrust body, the two end parts and the thrust body are integrally formed to form the thrust plate with a U-shaped structure, and a central angle corresponding to each thrust plate is larger than 180 degrees and smaller than or equal to 235 degrees;

the thrust body is abutted against the inner wall of the main bearing cover and is positioned with the main bearing cover through a positioning pin, and the two tail end parts are abutted against the inner wall of the main bearing seat.

As a preferred technical scheme of the crankshaft thrust structure, a positioning lip is arranged on the peripheral wall of the thrust body and clamped between the main bearing cover and a joint surface of a main bearing seat on the crankshaft.

As a preferable technical solution of the crankshaft thrust structure, the positioning lip is provided at a position on the thrust body, where the positioning lip is connected to the end portion.

As a preferable technical solution of the crankshaft thrust structure, an end face of one axial end of the thrust plate is a thrust face, and the thrust face is provided with an oil groove.

As a preferable technical solution of the above crankshaft thrust structure, the oil groove is provided on the thrust body.

As a preferable technical solution of the above crankshaft thrust structure, the number of the oil grooves is at least two, and the at least two oil grooves are distributed along the circumferential direction of the thrust surface.

As a preferable technical scheme of the crankshaft thrust structure, a first positioning pin hole for inserting the positioning pin is formed in one of the oil grooves.

As a preferable technical solution of the crankshaft thrust structure, at least one of the end portions is provided with a guide surface, and the guide surface is arranged on the thrust surface;

the guide surface is inclined towards one side of the thrust plate, which is opposite to the thrust surface, along the direction from the bottom of the thrust plate to the opening of the thrust plate.

As a preferred technical scheme of the crankshaft thrust structure, one end of the positioning pin is in clearance fit with the thrust body, and the other end of the positioning pin is in interference fit with the main bearing cap.

The utility model also provides an engine, including foretell bent axle thrust structure.

The utility model has the advantages that: the utility model adopts the thrust plate with the U-shaped structure, and the central angle corresponding to the thrust plate is more than 180 degrees and less than or equal to 235 degrees, so that the space is reasonably utilized, compared with a full-circle thrust structure, the number of the thrust plate is reduced, the assembly efficiency is improved, and the processing cost is reduced; compared with a semicircular thrust structure, the positioning mode is simple by positioning the thrust plate and the main bearing cap by the positioning pin. The utility model discloses fix a position thrust piece and main bearing cap through the locating pin, locate mode is simple, need not to process the thrust groove, can prevent that the thrust piece from rotating, has reduced the processing cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a thrust plate according to an embodiment of the present invention;

fig. 2 is a schematic view of a crankshaft thrust structure provided by an embodiment of the present invention;

fig. 3 is a cross-sectional view of a crankshaft thrust structure provided by an embodiment of the present invention.

In the figure:

1. a thrust plate; 11. a thrust body; 12. a terminal portion; 13. an oil sump; 14. a positioning lip; 15. a guide surface; 16. a first dowel hole;

2. a main bearing housing;

3. and a main bearing cap.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements related to the present invention are shown in the drawings.

As shown in fig. 1 to 3, the present embodiment provides a crankshaft thrust structure, including a thrust plate 1, a main bearing housing 2 and a main bearing cap 3, where the thrust plate 1 is used to axially limit a crankshaft, and specifically includes a semicircular thrust body 11 and end portions 12 disposed at two ends of an opening of the thrust body 11. In the present embodiment, two end portions 12 are integrally provided with the thrust plate 1 of the U-shaped structure with the thrust body 11, and the corresponding central angle of the thrust plate 1 is greater than 180 ° and less than or equal to 235 °, referring to the angle α shown in fig. 2. By adopting the crankshaft thrust structure, the reasonable utilization of the arrangement space can be realized, and compared with a full-circle thrust structure, the use number of the thrust plates 1 is reduced, the assembly efficiency is improved, and the processing cost is reduced.

The thrust plate 1 is provided with a first positioning pin hole 16, the main bearing cap 3 is provided with a second positioning pin hole, and the first positioning pin hole 16 and the second positioning pin hole are connected through a positioning pin. Specifically, the first positioning pin hole 16 extends along the axial direction of the thrust plate 1, one end of the positioning pin is in clearance fit with the first positioning pin hole 16, and the other end of the positioning pin is in interference fit with the second positioning pin hole. This embodiment fixes a position thrust plate 1 and main bearing cap 3 through the locating pin, and the locate mode is simple, need not to process the thrust groove, can prevent thrust plate 1 from rotating, has reduced the processing cost.

Further, the outer circumferential wall of the thrust body 11 is provided with a positioning lip 14, and preferably, the positioning lip 14 is provided at a position on the thrust body 11, which is in contact with the terminal portion 12. The positioning lip 14 is interposed between the joint surfaces of the main bearing housing 2 and the main bearing cap 3, and the thrust plate 1 can be prevented from falling off when the crankshaft thrust structure is assembled.

Further, an end surface of one axial end of the thrust plate 1 is a thrust surface, and an oil groove 13 is provided on the thrust surface. The oil grooves 13 are at least two, and the at least two oil grooves 13 are distributed along the circumferential direction of the thrust surface.

Preferably, the oil grooves 13 are provided in three numbers, and lubricating oil is stored through the oil grooves 13 to lubricate the crankshaft. In this embodiment, the central angle corresponding to the thrust plate 1 is divided into two equal parts, and a plane located on the same plane as the central axis of the thrust plate 1 is a symmetry plane, and the oil grooves 13 are symmetrically arranged about the symmetry plane.

Further, the first positioning pin hole 16 is provided in one of the oil grooves 13. By adopting the arrangement, the first positioning pin hole 16 can be prevented from being arranged at other positions on the thrust surface, so that the area of the thrust surface in contact with the crankshaft is ensured.

At least one of the end sections 12 is provided with a guide surface 15, the guide surface 15 being provided on the thrust surface; the guide surface 15 is inclined toward a side of the thrust plate 1 opposite to the thrust surface in a direction from the bottom of the thrust plate 1 to the opening thereof. The guide surface 15 is arranged to facilitate the lubricating oil to enter the thrust surface and improve the lubricating environment. Preferably, each tip portion 12 is provided with a guide surface 15.

The embodiment also provides an engine comprising the crankshaft thrust structure.

It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 in specific cases to those skilled in the art.

Claims

1. The crankshaft thrust structure comprises a main bearing seat (2), a main bearing cap (3) and a thrust plate (1), and is characterized in that the thrust plate (1) comprises a semicircular thrust body (11) and end parts (12) arranged at two ends of an opening of the thrust body (11), the two end parts (12) and the thrust body (11) are integrally formed to form the thrust plate (1) with a U-shaped structure, and a central angle corresponding to the thrust plate (1) is larger than 180 degrees and smaller than or equal to 235 degrees;

the thrust body (11) is abutted against the inner wall of the main bearing cover (3) and is positioned with the main bearing cover (3) through a positioning pin, and the two tail end parts (12) are abutted against the inner wall of the main bearing seat (2).

2. The crankshaft thrust structure according to claim 1, wherein a positioning lip (14) is arranged on the outer peripheral wall of the thrust body (11), and the positioning lip (14) is clamped between the combined surfaces of the main bearing cover (3) and the main bearing seat (2).

3. The crankshaft thrust structure according to claim 2, wherein the positioning lip (14) is provided on the thrust body (11) at a position where it meets the tip portion (12).

4. The crankshaft thrust structure according to claim 1, wherein the end face of one axial end of the thrust plate (1) is a thrust face, and an oil groove (13) is formed in the thrust face.

5. The crankshaft thrust structure according to claim 4, wherein the oil groove (13) is provided on the thrust body (11).

6. The crankshaft thrust structure according to claim 4, characterized in that the oil grooves (13) are provided with at least two, at least two oil grooves (13) being distributed along the circumferential direction of the thrust surface.

7. The crankshaft thrust structure according to claim 6, wherein a first positioning pin hole (16) for inserting the positioning pin is formed in one of the oil grooves (13).

8. The crankshaft thrust structure according to claim 4, wherein at least one of the end portions (12) is provided with a guide surface (15), and the guide surface (15) is provided on the thrust surface;

and along the direction from the bottom of the thrust plate (1) to the opening of the thrust plate, the guide surface (15) inclines to one side, back to the thrust surface, of the thrust plate (1).

9. A crankshaft thrust structure according to claim 1, wherein one end of the dowel pin is in clearance fit with the thrust body (11) and the other end is in interference fit with the main bearing cap (3).

10. An engine comprising the crankshaft thrust structure of any one of claims 1 to 9.