Camshaft frame structure for improving NVH

Abstract

The utility model discloses a camshaft frame structure for improving NVH (Noise Vibration and Harshness), which comprises a frame and a cylinder cover, the frame is fixed on the top surface of the cylinder cover through bolts, and the periphery of the frame is tightly attached to the periphery of the top surface of the cylinder cover; a plurality of camshaft bearing seats which are arranged side by side are arranged in the frame at intervals, lower camshaft bearing holes are formed in the upper parts of the camshaft bearing seats, and the lower sides of the camshaft bearing seats are connected to the cylinder cover; and the lower side of the camshaft bearing seat is locally dug to form an open slot, so that the contact area between the camshaft bearing seat and the upper side of the cylinder cover is reduced. The utility model has the advantages that the flapping area of the camshaft frame and the cylinder cover is reduced, the noise is reduced, and the NVH is optimized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine, in particular to a camshaft frame structure of improving NVH. BACKGROUND

[0002] The camshaft frame is installed on the cylinder cover body, and the lower side of the camshaft bearing seat of the camshaft frame is in close contact with the cylinder cover. The camshaft frame is used for supporting the camshaft bearing cover, the camshaft and other valve train related parts. During the operation of the engine, the camshaft frame is subjected to upward and downward forces, which causes repeated tapping between the camshaft frame and the cylinder cover. Because the contact area between the camshaft frame and the cylinder cover is large, the tapping area is large, the noise is loud, and the NVH is poor.

[0003] For example, the applicant previously proposed CN213980905U, a camshaft bearing cover oil channel structure, CN209385246U, a sealing ring heat-resistant flat-top cylinder cover structure cooperating with a camshaft frame, CN109404155A, a diesel engine cylinder cover structure, and other patents containing a camshaft frame structure. In particular, patent CN109404155A is highly relevant to the present application, or in other words, the scheme of the present application is further improved based on patent CN109404155A to solve the problems of loud noise and poor NVH in patent CN109404155A.

[0004] The disclosure of the above background art content is only used to assist in understanding the concept and technical solution of the utility model, and it does not necessarily belong to the prior art of the present patent application. In the absence of explicit evidence that the above content has been disclosed on the filing date of the present patent application, the above background art should not be used to evaluate the novelty and inventiveness of the present application. UTILITY MODEL CONTENT

[0005] The utility model is mainly aimed at providing a camshaft frame structure that reduces the tapping area between the camshaft frame and the cylinder cover, reduces noise, and optimizes NVH.

[0006] Therefore, the utility model provides a camshaft frame structure that improves NVH.

[0007] Preferably, the utility model can also have the following technical features:

[0008] The utility model provides a camshaft frame structure of improving NVH, including frame, cylinder cover, the frame is fixed through bolt on the top surface of cylinder cover, the four around of frame and the four around of cylinder cover top surface close fitting, a plurality of side by side arrangement's camshaft bearing seat is arranged in the frame interval, the lower side of camshaft bearing seat second stop bearing seat to last stop bearing seat is partially excavated, forms the opening groove, reduces the contact area of camshaft bearing seat and cylinder cover upside.

[0009] Further, the opening groove is a rectangular groove structure.

[0010] Further, the opening groove is a rectangular groove structure.

[0011] Further, the depth of the opening groove is 0.3±0.1mm.

[0012] Further, the depth of the opening groove is 0.3mm.

[0013] Further, the opening groove is a counterbore.

[0014] Further, the opening groove is a circular groove.

[0015] The beneficial effects of the utility model compared with prior art include: by excavating the lower side of camshaft bearing seat, further reduce the contact area of camshaft frame and cylinder cover, thereby reduce the patting area of camshaft frame and cylinder cover, reduce noise, optimize NVH. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the structural schematic diagram of the utility model.

[0017] Figure 2 It is the overhead structural schematic diagram of the utility model.

[0018] Figure 3 It is Figure 2 The partial sectional view of A-A in

[0019] Figure 4 It is the frame front three-dimensional structure diagram of the utility model.

[0020] Figure 5 It is the frame back three-dimensional structure diagram of the utility model. DETAILED DESCRIPTION

[0021] The utility model will be further explained in detail in conjunction with specific implementation and contrast drawing.It should be emphasized that the following explanation is only exemplary, and is not for limiting the scope of the utility model and its application.

[0022] Non-limiting and non-exclusive embodiments will be described with reference to the following figures, wherein the same reference numerals denote the same parts unless otherwise specifically stated.

[0023] like Figures 1-5 The diagram illustrates a camshaft frame structure for improving NVH (Noise, Vibration, and Harshness). It includes a frame 2 and a cylinder head 1. The frame 2 is bolted to the top surface of the cylinder head 1, and the frame 2 and the top surface of the cylinder head 1 are tightly fitted together to achieve a seal. Several camshaft bearing seats are arranged side-by-side within the frame 2. Each camshaft bearing seat has a lower camshaft bearing hole 26 at its upper part and is connected to the cylinder head 1 at its lower side. Generally, the camshaft bearing seat closest to the rear of the engine is designated as the first-stage bearing seat, and second-stage, third-stage, ..., and last-stage bearing seats are arranged along the length of the frame 2. For example, in this embodiment, seven bearing seats are provided, including a first-stage bearing seat 23, a second-stage bearing seat 24, and so on, up to the seventh-stage bearing seat 25. The lower sides of the second-stage to last-stage bearing seats are partially recessed to form openings 27, reducing the contact area between the camshaft bearing seats and the upper side of the cylinder head 1, thereby reducing noise and optimizing NVH. After the camshaft frame 2 is fixed to the cylinder head 1, a gap is formed between the camshaft bearing housing recess area and the cylinder head 1. Mounting holes 22 for mounting the camshaft are also provided at both ends of the frame 2.

[0024] The opening groove 27 is a rectangular groove structure. Preferably, both ends of the opening groove 27 extend through both sides of the camshaft bearing housing, and the distance between the two side walls of the opening groove 27 is equal to or less than the diameter of the lower camshaft bearing hole 26. In an optional embodiment, the opening groove 27 can also be a countersunk hole structure.

[0025] More specifically, the depth of the opening groove 27 is 0.3±0.1mm, preferably 0.3mm.

[0026] In other embodiments, the opening slot 27 can also be a slot of other shapes, such as a circular slot, an elliptical slot, etc., as long as it can reduce the contact area between the camshaft frame 2 and the cylinder head 1.

[0027] Those skilled in the art will recognize that numerous variations are possible with respect to the above description, and the embodiments and figures are merely for describing one or more specific implementations.

[0028] While there have been described and illustrated what are considered to be exemplary embodiments of the present application, it will be understood by those skilled in the art that various changes and modifications can be made therein without departing from the spirit of the present application. Furthermore, it is also contemplated that many modifications can be made to adapt a particular situation to the teachings of the present application without departing from the central concept of the present application described herein. Accordingly, the present application is not limited to only those embodiments described and illustrated herein, but is intended to encompass all embodiments falling within the scope of the present application and equivalents thereof.

Claims

1. A camshaft frame structure for improving NVH, comprising a frame and a cylinder head, the frame being fixed to the top surface of the cylinder head by bolts, the periphery of the frame and the periphery of the top surface of the cylinder head being closely fitted; a plurality of camshaft bearing seats arranged side by side are arranged in the frame in intervals, the upper part of the camshaft bearing seat is provided with a lower camshaft bearing hole, and the lower side is connected to the cylinder head; characterized in that: The lower side of the second to last blocking bearing seat of the camshaft bearing seat is partially excavated to form an open slot, thereby reducing the contact area between the camshaft bearing seat and the upper side of the cylinder head. ​ 2. The NVH improving camshaft frame structure of claim 1, wherein: The open slot is a rectangular slot structure.

3. The NVH improving camshaft frame structure of claim 2, wherein: The two ends of the open slot penetrate through the two sides of the camshaft bearing seat, and the distance between the two sidewalls of the open slot is equal to or less than the diameter of the lower camshaft bearing hole.

4. The NVH improving camshaft frame structure according to any one of claims 1-3, characterized in that: The depth of the open slot is 0.3±0.1mm.

5. The NVH improving camshaft frame structure of claim 4, wherein: The depth of the open slot is 0.3mm.

6. The NVH improving camshaft frame structure of claim 2, wherein: The open slot is a counterbore.

7. The NVH improving camshaft frame structure of claim 1, wherein: The open slot is a circular slot.

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