CN114135357A

CN114135357A - Engine sprocket mounting mechanism and mounting method

Info

Publication number: CN114135357A
Application number: CN202111451157.2A
Authority: CN
Inventors: 林志成; 林健明
Original assignee: Jiangmen Dachangjiang Group Co Ltd
Current assignee: Jiangmen Dachangjiang Group Co Ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-03-04

Abstract

The invention relates to an engine chain wheel mounting mechanism and a mounting method. The engine sprocket mounting mechanism includes: installation cylinder head, assembly seat, fixed part, cam shaft assembly, water pump seat and sprocket assembly, the cam shaft assembly the assembly seat with the fixed part is all installed the installation cylinder is overhead, be equipped with on the assembly seat and be used for the assembly water pump seat assembly portion, the fixed part is located the outside of installation cylinder head, the one end of fixed subassembly passes through in proper order the fixed part with assembly portion realize with the fixed cooperation of water pump seat, the sprocket assembly is installed the cam shaft assembly orientation the one end of assembly portion is followed the axial direction of cam shaft assembly, the opening size of assembly portion is greater than the terminal surface size of sprocket assembly.

Description

Engine sprocket mounting mechanism and mounting method

Technical Field

The invention relates to the technical field of engines, in particular to an engine chain wheel mounting mechanism and a mounting method.

Background

At the in-process of assembling the engine, can assemble parts such as water pump seat, chain and sprocket, at this moment, the water pump seat need assemble engine cylinder head through fixing bolt on, the sprocket need assemble the camshaft of engine on, needs chain and sprocket drive meshing simultaneously, and after water pump seat and sprocket assembly accomplished, the water pump seat was counterpointed with the sprocket. However, when the water pump seat is fixed in the conventional engine, the fixing bolt needs to be embedded in the engine cylinder head, so that when the water pump seat and the chain wheel are assembled, the water pump seat needs to be fixed on the engine cylinder head firstly and then the chain wheel needs to be assembled. At this time, since the installation position of the sprocket is located between the camshaft and the water pump base, that is, the installation space of the sprocket is very limited, the sprocket is easy to scratch the inner wall surface of the water pump base during assembly.

Disclosure of Invention

In view of this, it is necessary to provide an engine sprocket mounting mechanism and a mounting method for solving the problem that the sprocket is likely to scratch the inner wall surface of the water pump base during assembly.

An engine sprocket mounting mechanism. The engine sprocket mounting mechanism includes: installation cylinder head, assembly seat, fixed part, cam shaft assembly, water pump seat and sprocket assembly, the cam shaft assembly the assembly seat with the fixed part is all installed the installation cylinder is overhead, be equipped with on the assembly seat and be used for the assembly portion of water pump seat, the fixed part is located the outside of installation cylinder head, the one end of fixed subassembly passes through in proper order the fixed part with assembly portion realize with the fixed cooperation of water pump seat, sprocket assembly installs the cam shaft assembly orientation the one end of assembly portion is followed the axial direction of cam shaft assembly, the open size of assembly portion is greater than the terminal surface size of sprocket assembly.

The method for mounting the engine chain wheel adopts the engine chain wheel mounting mechanism and further comprises the following steps:

assembling the sprocket assembly to the camshaft assembly;

after the chain wheel assembly is installed, installing the water pump seat on the assembling part;

and the fixing component sequentially penetrates through the fixing part and the assembling part from the outside of the mounting cylinder head and is fixedly matched with the water pump seat.

In one embodiment, the fixing assembly includes a first fixing member and a second fixing member, the fixing portion includes a first fixing column and a second fixing column, the first fixing column and the second fixing column are spaced apart from each other on the mounting cylinder head, the first fixing column and the second fixing column are embedded in the side portion of the mounting cylinder head, a first fixing hole is formed in the first fixing column, a second fixing hole is formed in the second fixing column, one of the orifices of the first fixing hole and one of the orifices of the second fixing hole are both communicated with the outside, the other orifice of the first fixing hole and the other orifice of the second fixing hole are both communicated with the mounting portion, one end of the first fixing member is fixedly matched with the water pump base through the first fixing hole and the mounting portion in sequence, and one end of the second fixing member is fixedly matched with the water pump base through the second fixing hole and the mounting portion in sequence .

In one embodiment, after the first fixing piece is fixedly matched with the water pump seat, the other end of the first fixing piece is positioned outside the opening of the first fixing hole or the other end of the first fixing piece is positioned in the first fixing hole; after the second fixing piece is fixedly matched with the water pump base, the other end of the second fixing piece is positioned outside the orifice of the second fixing hole or the other end of the second fixing piece is positioned in the second fixing hole.

In one of them embodiment, the sprocket subassembly includes sprocket spare and chain, the sprocket spare is installed the tip of camshaft subassembly, the chain cover is established the outside of sprocket spare and with sprocket spare transmission meshing, works as the sprocket spare with after the chain installation is accomplished, will the water pump seat is installed in the assembly portion is last.

In one embodiment, the sprocket member is provided with a first timing scale mark, the water pump seat is provided with a second timing scale mark, the first timing scale mark is flush with a horizontal reference line of the assembling portion when the sprocket member is mounted on the camshaft assembly, and the second timing scale mark is flush with the first timing scale mark when the water pump seat is mounted on the assembling portion.

In one embodiment, the engine sprocket mounting mechanism further comprises a pressure reducing rocker arm mounted on the sprocket member, and the pressure reducing rocker arm is located between the water pump seat and the sprocket member.

In one embodiment, the pressure relief rocker arm comprises: counterpoint installation department and arc adaptation portion, counterpoint the installation department with arc adaptation portion cooperation forms the swing arm portion, the one end of counterpointing the installation department be used for with sprocket spare normal running fit, follow the extending direction of counterpointing the installation department is in set up first subtract heavy portion on the installation department of counterpointing, following the extending direction of arc adaptation portion set up the second in the arc adaptation portion and subtract heavy portion, the focus of swing arm portion court the periphery skew of arc adaptation portion.

In one embodiment, the alignment mounting portion and the arc adapting portion are matched to form a C-shaped swing arm portion, the alignment mounting portion and the arc adapting portion are integrally formed or spliced, the first weight reducing portion is arranged on one side of the C-shaped swing arm portion along the extending direction of the C-shaped swing arm portion, the second weight reducing portion is arranged on the other side of the C-shaped swing arm portion, the joint of the alignment mounting portion and the arc adapting portion is a gravity center portion, and the first weight reducing portion and the second weight reducing portion are respectively located on two sides of the gravity center portion.

In one embodiment, the first weight-reducing portion and the second weight-reducing portion are weight-reducing grooves or weight-reducing cavities, the first weight-reducing portion extends from one end of the alignment mounting portion to the other end of the alignment mounting portion, and the second weight-reducing portion extends from one end of the arc-shaped adapting portion to the other end of the arc-shaped adapting portion.

When the engine chain wheel mounting mechanism is assembled, firstly, the assembling position of the assembling seat on the mounting cylinder head is determined according to the mounting space on the mounting cylinder head and the mounting position of the relevant matching component. The assembling seat and the mounting cylinder head can be integrally formed or spliced and formed according to mounting requirements. Then, a fixing portion is provided on the mounting cylinder head in accordance with a mounting position of the mounting seat on the mounting cylinder head. After the fixing part is arranged, the fixing part is positioned at the outer side of the mounting cylinder head, for example: the fixing part can be directly arranged on the side part of the mounting cylinder head, namely when the fixing part is fixed through the fixing component, the fixing component can be directly fixed from the outer side of the mounting cylinder head, or under the condition that the strength of the mounting cylinder head is not influenced, the inlet end of the fixing part directly extends to be arranged at the bottom of the mounting cylinder head, namely the fixing part integrally penetrates through the mounting cylinder head, and the mounting sequence of the water pump base can be flexibly selected according to the actual mounting condition in the embodiment, namely the mounting influence of other assembly parts can be avoided. Further, according to the shape or the structure of required equipment water pump seat, design corresponding assembly portion on the assembly seat, the water pump seat is installed on the assembly seat through assembly portion in order to improve the fixed effect of assembly seat to the water pump seat promptly. Therefore, in traditional assembly mode, can only fix the water pump mount earlier and then fix the sprocket assembly, and above-mentioned engine sprocket installation mechanism has removed the precedence order of water pump mount and sprocket assembly fixed assembly through setting up the fixed part in the outside of installation cylinder head, can assemble sprocket assembly repacking water pump mount earlier, simultaneously, along camshaft component's axial direction, the opening size of assembly portion is greater than sprocket assembly's terminal surface size, can effectively increase sprocket assembly's installation space and improve the visual scope of sprocket assembly installation to can effectively avoid sprocket assembly to scratch the internal face of water pump mount when the assembly.

Compare in traditional assembly methods (can only fix the water pump mount earlier then fix the sprocket subassembly), above-mentioned engine sprocket's mounting method installs sprocket subassembly on camshaft subassembly earlier when using, because, in sprocket subassembly installation in-process, the water pump mount is not installed to assembly portion, and along camshaft subassembly's axial direction simultaneously, the opening size of assembly portion is greater than sprocket subassembly's terminal surface size has improved sprocket subassembly's installation space greatly and has improved the visual scope of sprocket subassembly installation to it is more convenient to make sprocket subassembly's installation. Further, install the outside at the installation cylinder head through the fixed part for fixed subassembly can pass fixed part and assembly part in proper order and with water pump seat fixed coordination from the outside of installation cylinder head, has realized promptly and has adorned the mounting means of water pump seat after the chain wheel subassembly earlier, effectively avoids the chain wheel subassembly to scratch the internal face of water pump seat when the assembly.

Drawings

FIG. 1 is a schematic view of an assembly structure of an engine sprocket mounting mechanism according to an embodiment;

FIG. 2 is a schematic view of an assembly structure of another embodiment of the engine sprocket mounting mechanism;

FIG. 3 is an exploded view of one embodiment of the engine sprocket mounting mechanism;

FIG. 4 is a schematic structural view of a pressure reducing rocker arm;

FIG. 5 is a flow chart of a method of mounting an engine sprocket.

100. The mounting cylinder head comprises a cylinder head body, 200, a mounting seat, 210, a mounting part, 300, a fixing component, 310, a first fixing part, 320, a second fixing part, 400, a fixing part, 410, a first fixing column, 411, a first fixing hole, 420, a second fixing column, 421, a second fixing hole, 500, a camshaft component, 600, a water pump seat, 610, a second timing scale mark, 700, a sprocket component, 710, a sprocket component, 711, a first timing scale mark, 720, a chain, 730, a reset torsion spring, 800, a pressure reducing rocker arm, 810, an alignment mounting part, 811, a first weight reducing part, 820, an arc-shaped adapting part, 821, a second weight reducing part, 830, a rocker arm part, 840, a weight center part, 900, a pressure reducing baffle plate, 910 and a bolt.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" 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" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1-3, in one embodiment, an engine sprocket mounting mechanism comprises: installation cylinder head 100, mount pad 200, fixed subassembly 300, fixed part 400, camshaft assembly 500, water pump mount 600 and sprocket assembly 700, camshaft assembly 500 mount pad 200 with fixed part 400 all installs on installation cylinder head 100, be equipped with on the mount pad 200 and be used for the assembly portion 210 of water pump mount 600, fixed part 400 is located the outside of installation cylinder head 100, the one end of fixed subassembly 300 passes through in proper order fixed part 400 with assembly portion 210 realize with the fixed cooperation of water pump mount 600, sprocket assembly 700 is installed camshaft assembly 500 orientation the one end of assembly portion 210 is followed camshaft assembly 500's axial direction, assembly portion 210's opening size is greater than sprocket assembly 700's terminal surface size.

When assembling the above-described engine sprocket mounting mechanism, first, the mounting position of the mounting seat 200 on the mounting cylinder head 100 is determined based on the mounting space on the mounting cylinder head 100 and the mounting position of the relevant mating member. Mounting block 200 and mounting head 100 may be integrally formed or may be formed as a split joint, depending on the mounting requirements. Then, the fixing portion 400 is provided on the mounting cylinder head 100 according to the mounting position of the mounting seat 200 on the mounting cylinder head 100. After the fixing portion 400 is disposed, the fixing portion 400 is located outside the mounting cylinder head 100, for example: the fixing portion 400 may be directly disposed at a side portion of the mounting cylinder head 100, that is, when the fixing portion 300 is used for fixing, the fixing portion 300 may be directly fixed from an outer side of the mounting cylinder head 100, or an inlet end of the fixing portion 400 may be directly extended and disposed at a bottom portion of the mounting cylinder head 100 without affecting strength of the mounting cylinder head 100 itself, that is, the fixing portion 400 may be integrally penetrated through the mounting cylinder head 100, and the above-described embodiment may flexibly select an installation order of the water pump base 600 according to an actual installation situation, that is, may not be affected by installation of other assembling parts. Further, according to the shape or structure of the water pump base 600 to be assembled, a corresponding assembling portion 210 is designed on the assembling base 200, that is, the water pump base 600 is assembled on the assembling base 200 through the assembling portion 210 to improve the fixing effect of the assembling base 200 on the water pump base 600. Therefore, in the conventional assembly mode, the water pump seat 600 can be fixed firstly and then the sprocket assembly 700 is fixed, and the engine sprocket mounting mechanism can firstly assemble the sprocket assembly 700 and then assemble the water pump seat 600 by arranging the fixing part 400 at the outer side of the mounting cylinder head 100 and removing the sequence of fixing and assembling the water pump seat 600 and the sprocket assembly 700, and meanwhile, along the axial direction of the camshaft assembly 500, the opening size of the assembling part 210 is larger than the end face size of the sprocket assembly 700, so that the mounting space of the sprocket assembly 700 can be effectively increased, the visible range of mounting the sprocket assembly 700 is improved, and the phenomenon that the inner wall surface of the water pump seat 600 is scratched by the sprocket assembly 700 during assembly can be effectively avoided.

Referring to fig. 1 to 3, in an embodiment, the fixing assembly 300 includes a first fixing member 310 and a second fixing member 320, the fixing portion 400 includes a first fixing column 410 and a second fixing column 420, the first fixing column 410 and the second fixing column 420 are spaced apart from each other on the mounting cylinder head 100, the first fixing column 410 and the second fixing column 420 are embedded in the side portion of the mounting cylinder head 100, a first fixing hole 411 is disposed on the first fixing column 410, a second fixing hole 421 is disposed on the second fixing column 420, one of the openings of the first fixing hole 411 and the second fixing hole 421 are both communicated with the outside, the other opening of the first fixing hole 411 and the other opening of the second fixing hole 421 are both communicated with the mounting portion 210, one end of the first fixing member 310 sequentially passes through the first fixing hole 411 and the mounting portion 210 to achieve a fixing fit with the water pump base 600, one end of the second fixing member 320 passes through the second fixing hole 421 in sequence to be fixedly matched with the assembling portion of the water pump seat 600. Specifically, the first fixing element 310 and the second fixing element 320 are bolts 910 or screws. The first fixing post 410 and the second fixing post 420 may be integrally formed or spliced with the mounting cylinder head 100. The first fixing hole 411 is formed in the first fixing column 410, so that the first fixing member 310 can be fixed to the mounting seat 200 outside the mounting cylinder head 100. And a second fixing hole 421 is formed in the second fixing column 420, so that the second fixing member 320 can be fixed to the water pump seat 600 outside the mounting cylinder head 100. Therefore, the above embodiment can avoid the fixing assembly 300 from being embedded inside the mounting cylinder head 100, and realize the independent fixing of the water pump base 600 on the mounting cylinder head 100.

In one embodiment, after the first fixing member 310 is fixedly engaged with the water pump base 600, the other end of the first fixing member 310 is located outside the opening of the first fixing hole 411 or the other end of the first fixing member 310 is located in the first fixing hole 411; after the second fixing member 320 is fixedly engaged with the water pump base 600, the other end of the second fixing member 320 is located outside the opening of the second fixing hole 421 or the other end of the second fixing member 320 is located in the second fixing hole 421. Specifically, the end of the first fixing member 310 may be buried or exposed in the first fixing hole 411 and the end of the second fixing member 320 may be buried or exposed in the second fixing hole 421 according to installation needs.

In one embodiment, the water pump seat 600 is a circular ring seat, and the assembling portion 210 is an arc-shaped groove, and specifically, the assembling portion 210 can improve the attaching and fixing effects of the assembling seat 200 and the water pump seat 600. When the water pump base 600 is fixed to the fixing assembly 300, the water pump base 600 may be provided with a threaded hole that is fixedly engaged with the first fixing member 310 and the second fixing member 320. This is only one of the embodiments, for example: the first fixing element 310 and the second fixing element 320 may be fastening elements (a first fastening element and a second fastening element), that is, the first fixing element 310 sequentially passes through the first fixing hole 411 and the first assembling hole, and a first locking groove adapted to the first fastening element is formed on the water pump seat 600. And the second fixing member 320 sequentially passes through the second fixing hole 421 and the second assembling hole, and a second clamping groove adapted to the second fastening member is formed on the water pump seat 600. Namely, the water pump seat 600 is clamped and fixed with the fixing assembly 300.

Referring to fig. 1 to 3, in an embodiment, the sprocket assembly 700 includes a sprocket 710 and a chain 720, the sprocket 710 is disposed at an end of the camshaft assembly 500, the chain 720 is sleeved at an outer side of the sprocket 710 and is engaged with the sprocket 710 in a transmission manner, and when the sprocket 710 and the chain 720 are mounted, the water pump base 600 is mounted on the mounting portion 210. Specifically, install sprocket 710 on camshaft subassembly 500 earlier, then establish chain 720 cover the outside of sprocket 710, because, in the installation of sprocket 710 and chain 720, water pump base 600 is not installed to assembly portion 210, simultaneously along camshaft subassembly 500's axial direction, assembly portion 210's opening size is greater than sprocket assembly 700's terminal surface size, the installation space of sprocket 710 and chain 720 has been improved greatly and the visual scope of sprocket 710 and chain 720 installation has been improved, thereby make the installation of sprocket 710 and chain 720 more convenient.

Referring to fig. 1 to 3, in one embodiment, a first timing scale 711 is disposed on the sprocket 710, a second timing scale 610 is disposed on the water pump mount 600, when the sprocket 710 is mounted on the camshaft assembly 500, the first timing scale 711 is flush with a horizontal reference line of the mounting portion 210, and when the water pump mount 600 is mounted on the mounting portion 210, the second timing scale 610 is flush with the first timing scale 711. Specifically, when the sprocket member 710 is mounted, the first timing graduation marks 711 are aligned with the horizontal reference line of the mounting portion 210, so that the mounting alignment of the sprocket member 710 on the camshaft assembly 500 is ensured. Then, when installing water pump seat 600, carry out counterpoint through second timing scale mark 610 and first timing scale mark 711 and compare to can more effectual realization water pump seat 600 and the counterpoint installation of sprocket. Further, when the sprocket 710 and the water pump seat 600 are installed, the first timing mark 711 and the second timing mark 610 are flush with the horizontal reference line of the mounting portion 210.

Referring to fig. 1 to 4, in one embodiment, the engine sprocket mounting mechanism further includes a pressure reducing rocker arm 800, the pressure reducing rocker arm 800 is mounted on the sprocket member 710, and the pressure reducing rocker arm 800 is located between the water pump mount 600 and the sprocket member 710. The pressure reducing rocker arm 800 includes: counterpoint installation department 810 and arc adaptation portion 820, counterpoint installation department 810 with arc adaptation portion 820 cooperation forms swing arm portion 830, the one end of counterpoint installation department 810 is used for with sprocket 710 normal running fit, follows the extending direction of counterpoint installation department 810 is in set up first heavy portion 811 that subtracts on counterpoint installation department 810, along arc adaptation portion 820's extending direction set up the second in the arc adaptation portion 820 and subtract heavy portion 821, swing arm portion 830's focus court arc adaptation portion 820's periphery skew. Specifically, the size of the rocker arm 830, i.e., the length and shape of the alignment mounting portion 810, is first determined according to the size and shape of the sprocket 710 or the opening of the engine valve; the length, curvature, etc. of the arcuate mating portion 820. The alignment mount 810, when rotationally engaged with the sprocket 710, for example: through adding on sprocket 710 and establishing the rotation post, counterpoint installation department 810 realizes normal running fit through rotation post and sprocket 710, can be through adding on camshaft subassembly 500 simultaneously and establish reset torsional spring 730 in order to realize counterpoint the rotation that resets of installation department 810. Further, when the engine is operated, the sprocket member 710 rotates and generates a centrifugal force, and the rocker arm portion 830 performs a centrifugal rotation by the centrifugal force, thereby releasing the decompression effect of the decompression cam. When the engine stops working, the centrifugal force of the sprocket 710 disappears, the rocker arm part 830 will reset and rotate under the pulling force of the torsion spring, and the pressure reducing cam is driven to jack up the rocker arm, thereby realizing the pressure reducing effect. Compared with the traditional solid pressure reducing rocker arm 800, the pressure reducing rocker arm 800 can effectively reduce the weight of the pressure reducing rocker arm 800 by arranging the first weight reducing part 811 on the alignment installation part 810 and the second weight reducing part 821 on the arc-shaped adapting part 820, so that the pressure reducing rocker arm 800 can be stressed and rotated more easily, and the using effect of the pressure reducing rocker arm 800 is ensured.

In one embodiment, as shown in fig. 3, the pressure relief rocker arm 800 is movably mounted to the sprocket member 710 by a pressure relief flap 900. For example: pressure relief flap 900 is secured to sprocket member 710 by bolts 910.

In one embodiment, as shown in fig. 4, the alignment mounting portion 810 and the arc adapting portion 820 are matched to form a C-shaped rocker arm 830, the alignment mounting portion 810 and the arc adapting portion 820 are integrally formed or spliced, along the extending direction of the C-shaped rocker arm 830, the first weight-reducing portion 811 is opened on one side of the C-shaped rocker arm 830, the second weight-reducing portion 821 is opened on the other side of the C-shaped rocker arm 830, a connecting portion between the alignment mounting portion 810 and the arc adapting portion 820 is a gravity center portion 840, and the first weight-reducing portion 811 and the second weight-reducing portion 821 are respectively located on two sides of the gravity center portion 840. Specifically, the alignment installation portion 810 and the arc-shaped adapting portion 820 are rod bodies or plate bodies. The swing arm portion 830 is formed in a C-shape according to the size and shape of the sprocket, and when the pressure reducing swing arm 800 is attached to the sprocket, the arc of the C-shaped swing arm portion 830 is adapted to the circumferential arc of the sprocket. Further, the overall strength of the pressure reducing rocker arm 800 can be varied by adjusting the overall thickness of the alignment mounting portion 810 and the overall thickness of the arc-shaped fitting portion 820. The self-strength of the pressure reducing rocker arm 800 can be effectively ensured by integrally forming the alignment mounting part 810 and the arc-shaped adapting part 820. Sometimes, the pressure reducing rocker arm 800 needs to be suitable for sprockets of different sizes, and the alignment mounting portion 810 and the arc-shaped adapting portion 820 can be spliced and fixed at this time, for example: the connection between the alignment installation part 810 and the arc-shaped adapting part 820 is realized by bolts 910 or a buckle. Furthermore, by providing the first weight-reducing portion 811 on the alignment mounting portion 810 and providing the second weight-reducing portion 821 on the arc-shaped adapting portion 820, the weight of the decompression rocker arm 800 can be adjusted so that the center of gravity of the rocker arm 830 is shifted toward the outer periphery of the arc-shaped adapting portion 820, and the above embodiment can more effectively improve the strength of the rocker arm 830 during rotation.

In one embodiment, the first weight-reducing portion 811 and the second weight-reducing portion 821 are weight-reducing slots or weight-reducing cavities, the first weight-reducing portion 811 extends from one end of the alignment mounting portion 810 to the other end of the alignment mounting portion 810, and the second weight-reducing portion 821 extends from one end of the arc-shaped adapting portion 820 to the other end of the arc-shaped adapting portion 820. Specifically, the first weight reduction portion 811 and the second weight reduction portion 821 are opened while the strength requirement of the decompression rocker arm 800 itself is ensured, for example: the first weight-reducing portion 811 is opened from the outside toward the inside from one side of the rocker arm portion 830, and the second weight-reducing portion 821 is opened from the outside toward the inside from the other side of the rocker arm portion 830. In this embodiment, after the first weight-reducing portion 811 and the second weight-reducing portion 821 are opened, the strength of the rocker arm 830 may need to be increased, and in this case, a first reinforcing cover and a second reinforcing cover may be additionally provided on the rocker arm 830, that is, the first reinforcing cover is mounted on the alignment mounting portion 810, and the first weight-reducing portion 811 is covered and fixed by the first reinforcing cover; the second reinforcing cover is mounted on the arc-shaped mounting portion, and covers and fixes the second lightening portion 821.

Referring to fig. 5, in one embodiment, a method for mounting an engine sprocket, using the engine sprocket mounting mechanism, further includes the following steps:

s100, assembling the sprocket assembly 700 to the camshaft assembly 500;

s200, after the chain wheel assembly 700 is installed, installing the water pump seat 600 on the assembling part 210;

and S300, sequentially passing the fixing assembly 300 from the outside of the mounting cylinder head 100 through the fixing part 400 and the assembling part 210, and fixedly matching with the water pump base 600.

Compared with the traditional assembly mode (only fixing the water pump seat 600 and then fixing the chain wheel assembly 700), the installation method of the engine chain wheel firstly installs the chain wheel assembly 700 on the camshaft assembly 500 when in use, because, in the installation process of the chain wheel assembly 700, the water pump seat 600 is not installed on the assembly part 210, and simultaneously along the axial direction of the camshaft assembly 500, the opening size of the assembly part 210 is larger than the end face size of the chain wheel assembly 700, the installation space of the chain wheel assembly 700 is greatly improved, and the visual range for installing the chain wheel assembly 700 is improved, so that the installation of the chain wheel assembly 700 is more convenient. Further, by installing the fixing portion 400 at the outer side of the mounting cylinder head 100, the fixing assembly 300 can sequentially penetrate through the fixing portion 400 and the assembling portion 210 from the outer portion of the mounting cylinder head 100 and is fixedly matched with the water pump base 600, that is, the mounting mode that the chain wheel assembly 700 is installed firstly and then the water pump base 600 is installed is realized, and the chain wheel assembly 700 is effectively prevented from scratching the inner wall surface of the water pump base 600 during assembly.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. An engine sprocket mounting mechanism, comprising: installation cylinder head, assembly seat, fixed part, cam shaft assembly, water pump seat and sprocket assembly, the cam shaft assembly the assembly seat with the fixed part is all installed the installation cylinder is overhead, be equipped with on the assembly seat and be used for the assembly portion of water pump seat, the fixed part is located the outside of installation cylinder head, the one end of fixed subassembly passes through in proper order the fixed part with assembly portion realize with the fixed cooperation of water pump seat, sprocket assembly installs the cam shaft assembly orientation the one end of assembly portion is followed the axial direction of cam shaft assembly, the open size of assembly portion is greater than the terminal surface size of sprocket assembly.

2. The engine sprocket mounting mechanism of claim 1, wherein the fixing assembly comprises a first fixing member and a second fixing member, the fixing portion comprises a first fixing column and a second fixing column, the first fixing column and the second fixing column are spaced apart from each other on the mounting cylinder head, the first fixing column and the second fixing column are embedded in the side portion of the mounting cylinder head, a first fixing hole is formed in the first fixing column, a second fixing hole is formed in the second fixing column, one of the openings of the first fixing hole and one of the openings of the second fixing hole are both communicated with the outside, the other opening of the first fixing hole and the other opening of the second fixing hole are both communicated with the mounting portion, one end of the first fixing member is fixedly matched with the water pump seat through the first fixing hole and the mounting portion in sequence, one end of the second fixing piece sequentially passes through the second fixing hole and the assembling portion to be fixedly matched with the water pump base.

3. The engine sprocket mounting mechanism of claim 2, wherein when the first fixing member is fixedly engaged with the water pump mount, the other end of the first fixing member is located outside the first fixing hole aperture or the other end of the first fixing member is located in the first fixing hole; after the second fixing piece is fixedly matched with the water pump base, the other end of the second fixing piece is positioned outside the orifice of the second fixing hole or the other end of the second fixing piece is positioned in the second fixing hole.

4. The engine sprocket installation mechanism of claim 2, wherein the sprocket assembly comprises a sprocket member and a chain, the sprocket member is installed at the end of the camshaft assembly, the chain is sleeved at the outer side of the sprocket member and is engaged with the sprocket member in a transmission manner, and when the sprocket member and the chain are installed, the water pump base is installed on the assembling portion.

5. The engine sprocket mounting mechanism according to claim 4, wherein a first timing mark is provided on the sprocket member, and a second timing mark is provided on the water pump mount, the first timing mark being flush with a horizontal reference line of the mounting portion when the sprocket member is mounted on the camshaft assembly, and the second timing mark being flush with the first timing mark when the water pump mount is mounted on the mounting portion.

6. The engine sprocket mounting mechanism of claim 4, further comprising a pressure relief rocker arm mounted on the sprocket member, the pressure relief rocker arm being positioned between the water pump mount and the sprocket member.

7. The engine sprocket mounting mechanism of claim 6, wherein the pressure reducing rocker arm comprises: counterpoint installation department and arc adaptation portion, counterpoint the installation department with arc adaptation portion cooperation forms the swing arm portion, the one end of counterpointing the installation department be used for with sprocket spare normal running fit, follow the extending direction of counterpointing the installation department set up first subtract heavy portion on the counterpoint installation department, follow the extending direction of arc adaptation portion set up the second in the arc adaptation portion and subtract heavy portion, the focus of swing arm portion court the periphery skew of arc adaptation portion.

8. The engine sprocket mounting mechanism according to claim 7, wherein the alignment mounting portion and the arc fitting portion cooperate to form a C-shaped rocker arm portion, and in an extending direction of the C-shaped rocker arm portion, the first weight reduction portion is provided on one side of the C-shaped rocker arm portion, the second weight reduction portion is provided on the other side of the C-shaped rocker arm portion, a joint of the alignment mounting portion and the arc fitting portion is a center of gravity portion, and the first weight reduction portion and the second weight reduction portion are respectively located on both sides of the center of gravity portion.

9. The engine sprocket mounting mechanism of claim 8, wherein the first weight-reducing portion and the second weight-reducing portion are weight-reducing grooves or weight-reducing cavities, the first weight-reducing portion extending from one of the ends of the alignment mounting portion to the other end of the alignment mounting portion, the second weight-reducing portion extending from one of the ends of the arc-shaped adapting portion to the other end of the arc-shaped adapting portion.

10. A method of mounting an engine sprocket, using the engine sprocket mounting mechanism of any one of claims 1 to 9, further comprising the steps of:

assembling the sprocket assembly to the camshaft assembly;