CN215256500U - Bearing cap structure with passive thrust function - Google Patents

Abstract

The utility model discloses a take bearing cap structure of passive thrust function relates to engine spare part technical field, including the cylinder cap, be provided with camshaft lower bearing cap on the cylinder cap, the top of camshaft lower bearing cap is provided with camshaft upper bearing cap, be provided with a plurality of initiative thrust surface on the cylinder cap, be provided with a plurality of passive thrust surface under the camshaft on the bearing cap, the first lightening hole of a plurality of has been seted up under the camshaft on the bearing cap, a plurality of second lightening hole has been seted up on the bearing cap on the camshaft. The utility model discloses in, through initiative thrust surface and difference in height design, when not producing wearing and tearing and producing slight wearing and tearing, initiative thrust surface is as the thrust effect, when taking place unusual wearing and tearing volume and being greater than the difference in height of initiative thrust surface and passive thrust surface, and passive thrust surface participates in the thrust simultaneously with initiative thrust surface, can the wearing and tearing volume of effective control thrust surface.

Description

Bearing cap structure with passive thrust function

Technical Field

The utility model relates to an engine parts technical field specifically is a bearing cap structure of passive thrust function in area.

Background

After the engine starting system and the ignition system finish the starting and ignition of the engine, fuel is combusted to push the piston to move downwards, power is transmitted to the crankshaft, and the crankshaft drives the timing and gas distribution mechanism while transmitting power to the gearbox, so that the engine is provided with the breathing function of air intake and exhaust. The process is transmitted to the camshaft through the crankshaft chain wheel, the timing chain and the camshaft chain wheel, and the camshaft drives the opening and closing of the intake valve and the exhaust valve to realize the 'breathing' function of the engine. When the timing chain wheel drives the camshaft to rotate, the camshaft receives tangential force applied to the camshaft by the chain, and a force component exists in the axial direction. This results in a back and forth movement of the camshaft in the axial direction. Since metal expands by heat is a property of the substance itself. In addition, the accumulated dimensional tolerance generated by machining and assembling needs to be considered, so that a gap requirement larger than 0.15mm can be reserved in the axial direction of the camshaft, the problem of camshaft locking caused by metal thermal expansion is avoided, and in order to avoid the problem, a bearing cover structure for preventing the camshaft from thrusting is designed on a cylinder cover during engine design.

However, in the prior art, most of the bearing cap structures of the camshafts can only perform an active thrust action, and when abnormal wear occurs, the thrust effect on the camshafts is poor, so that the wear amount of the thrust surfaces cannot be well controlled.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a take bearing cap structure of passive thrust function to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

the bearing cover structure with the passive thrust function comprises a cylinder cover, wherein a lower camshaft bearing cover is arranged on the cylinder cover, an upper camshaft bearing cover is arranged at the top of the lower camshaft bearing cover, a plurality of active thrust surfaces are arranged on the cylinder cover, a plurality of passive thrust surfaces are arranged on the lower camshaft bearing cover, a plurality of first lightening holes are formed in the lower camshaft bearing cover, and a plurality of second lightening holes are formed in the upper camshaft bearing cover.

As a further aspect of the present invention: the cylinder cover is provided with a cam shaft.

As a further aspect of the present invention: the lower camshaft bearing cover and the cylinder cover are assembled through bolts and positioning sleeves, the lower camshaft bearing cover is connected with the upper camshaft bearing cover through bolts, and the lower camshaft bearing cover is matched with the upper camshaft bearing cover.

As a further aspect of the present invention: the distance of the active thrust surface, which is higher than that of the passive thrust surface, is larger than the positioning clearance between the lower bearing cover of the camshaft and the cylinder cover.

As a further aspect of the present invention: the number of the active thrust surfaces is equal to that of the passive thrust surfaces, and the active thrust surfaces correspond to the passive thrust surfaces one to one.

As a further aspect of the present invention: the lower camshaft bearing cover and the upper camshaft bearing cover are integrally formed by casting, and the first lightening hole and the second lightening hole are formed by casting the lower camshaft bearing cover and the upper camshaft bearing cover.

Compared with the prior art, the beneficial effects of the utility model are that: through casting integrated into one piece's camshaft lower bearing cap, camshaft upper bearing cap, first lightening hole and second lightening hole, under the prerequisite of proof strength, can reduce weight and the manufacturing cost of this bearing cap structure again, through initiative thrust surface and difference in height design, when the initiative thrust surface of camshaft and camshaft lower bearing cap takes place the contact, when not producing wearing and tearing, the initiative thrust surface can play the thrust effect, when producing slight wearing and tearing, still initiative thrust surface is as the thrust effect, when taking place unusual wearing and tearing volume and being greater than the difference in height of initiative thrust surface and passive thrust surface, passive thrust surface and initiative thrust surface participate in the thrust effect simultaneously, the thrust area will increase one time, the pressure of thrust surface will reduce half, can effectively control the wearing and tearing volume of thrust surface.

Drawings

Fig. 1 is a schematic structural diagram of a bearing cap structure with a passive thrust function.

Fig. 2 is a schematic diagram of a height difference between an active thrust surface and a passive thrust surface in a bearing cap structure with a passive thrust function.

The labels in the figure are: 1. a cylinder cover; 2. a camshaft lower bearing cap; 3. a camshaft upper bearing cap; 4. a first lightening hole; 5. a second lightening hole; 6. an active thrust surface; 7. an active thrust surface.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-2, in the embodiment of the present invention, a bearing cap structure with passive thrust function includes a cylinder cap 1, a lower camshaft bearing cap 2 is disposed on the cylinder cap 1, an upper camshaft bearing cap 3 is disposed on the top of the lower camshaft bearing cap 2, the lower camshaft bearing cap 2 is assembled with the cylinder cap 1 through bolts and a positioning sleeve, the lower camshaft bearing cap 2 is connected with the upper camshaft bearing cap 3 through bolts, the lower camshaft bearing cap 2 is fitted with the upper camshaft bearing cap 3, a plurality of active thrust surfaces 6 are disposed on the cylinder cap 1, a plurality of passive thrust surfaces 7 are disposed on the lower camshaft bearing cap 2, the number of the active thrust surfaces 6 is equal to that of the passive thrust surfaces 7, the active thrust surfaces 6 correspond to the passive thrust surfaces 7 one by one, the cylinder cap 1 is equipped with a camshaft, the distance of the active thrust surfaces 6 is greater than that of the passive thrust surfaces 7 than the positioning gap between the lower camshaft bearing cap 2 and the cylinder cap 1, when the camshaft contacts with the active thrust surface 6 of the lower camshaft bearing cap 2, when abrasion is not generated, the active thrust surface 6 can play a thrust role, when slight abrasion is generated, the active thrust surface 6 is still used as thrust, when abnormal abrasion loss is larger than the height difference between the active thrust surface 6 and the passive thrust surface 7, the passive thrust surface 7 and the active thrust surface 6 simultaneously participate in thrust, the thrust area is doubled, the pressure intensity of the thrust surface is reduced by half, namely, the abrasion loss of the thrust surface can be effectively controlled, a plurality of first lightening holes 4 are formed in the lower camshaft bearing cap 2, a plurality of second lightening holes 5 are formed in the upper camshaft bearing cap 3, the lower camshaft bearing cap 2 and the upper camshaft bearing cap 3 are cast and integrally, and the first lightening holes 4 and the second lightening holes 5 are formed after the lower camshaft bearing cap 2 and the upper camshaft bearing cap 3 are cast and formed, under the prerequisite of guaranteeing camshaft lower bearing cap 2 and 3 intensity of camshaft upper bearing cap, can reduce the weight of camshaft lower bearing cap 2 and camshaft upper bearing cap 3 again and use the material.

The utility model discloses a theory of operation is: in the using process, the camshaft lower bearing cover 2, the camshaft upper bearing cover 3, the first lightening holes 4 and the second lightening holes 5 which are integrally formed are cast, so that the weight and the used materials of the camshaft lower bearing cover 2 and the camshaft upper bearing cover 3 can be reduced on the premise of ensuring the strength of the camshaft lower bearing cover 2 and the camshaft upper bearing cover 3; when the camshaft contacts with the active thrust surface 6 of the lower bearing cap 2 of the camshaft, when abrasion is not generated, the active thrust surface 6 can play a thrust role, when slight abrasion is generated, the active thrust surface 6 is still used as a thrust, when abnormal abrasion loss is larger than the height difference between the active thrust surface 6 and the passive thrust surface 7, the passive thrust surface 7 and the active thrust surface 6 participate in thrust simultaneously, the thrust area is doubled, the pressure of the thrust surface is reduced by half, and the abrasion loss of the thrust surface can be effectively controlled.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (6)

1. The utility model provides a take bearing cap structure of passive thrust function, includes cylinder cap (1), its characterized in that: be provided with camshaft lower bearing cap (2) on cylinder cap (1), the top of camshaft lower bearing cap (2) is provided with camshaft upper bearing cap (3), be provided with a plurality of initiative thrust surface (6) on cylinder cap (1), be provided with a plurality of passive thrust surface (7) on camshaft lower bearing cap (2), set up a plurality of first lightening hole (4) on camshaft lower bearing cap (2), set up a plurality of second lightening hole (5) on camshaft upper bearing cap (3).

2. The bearing cap structure with the passive thrust function according to claim 1, wherein: the cylinder cover (1) is provided with a cam shaft.

3. The bearing cap structure with the passive thrust function according to claim 1, wherein: camshaft lower bearing cap (2) and cylinder cap (1) are assembled through bolt and position sleeve, and camshaft lower bearing cap (2) and camshaft upper bearing cap (3) are connected through bolt, camshaft lower bearing cap (2) and camshaft upper bearing cap (3) looks adaptation.

4. The bearing cap structure with the passive thrust function according to claim 1, wherein: the distance of the active thrust surface (6) which is higher than the passive thrust surface (7) is larger than the positioning clearance between the lower bearing cover (2) of the camshaft and the cylinder cover (1).

5. The bearing cap structure with the passive thrust function according to claim 1, wherein: the number of the active thrust surfaces (6) is equal to that of the passive thrust surfaces (7), and the active thrust surfaces (6) correspond to the passive thrust surfaces (7) one to one.

6. The bearing cap structure with the passive thrust function according to claim 1, wherein: the camshaft lower bearing cover (2) and the camshaft upper bearing cover (3) are integrally formed by casting, and the first lightening hole (4) and the second lightening hole (5) are formed by casting the camshaft lower bearing cover (2) and the camshaft upper bearing cover (3).

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