CN210564694U

CN210564694U - Combined camshaft

Info

Publication number: CN210564694U
Application number: CN201921783378.8U
Authority: CN
Inventors: 魏晓林; 彭帆; 张勋茂; 黄亮
Original assignee: Chengdu Xiling Power Technology Co ltd
Current assignee: Chengdu Xiling Power Technology Co ltd
Priority date: 2019-10-22
Filing date: 2019-10-22
Publication date: 2020-05-19
Anticipated expiration: 2029-10-22

Abstract

The utility model relates to a combined camshaft; the cam core tube, the cam and the bearing ring which are prepared separately are adopted, and the cam core tube, the cam and the bearing ring are matched and combined to form a combined cam shaft; the total amount of the camshaft assembly is effectively reduced by adopting a method of mounting the prefabricated cam and the bearing shaft on the prefabricated cam core pipe, and meanwhile, the prefabricated cam becomes a thin-walled disc sleeve part, so that the processing time of heat treatment is effectively reduced; the cam core pipe adopts the cold drawn steel pipe in advance, can make the whole work load of camshaft effectively reduce, and the total amount and the processing degree of difficulty of present whole camshaft can effectively be solved to this application, improve production efficiency.

Description

Combined camshaft

Technical Field

The utility model belongs to the technical field of the camshaft, concretely relates to modular camshaft.

Background

The camshaft is formed by mounting a plurality of shaft diameters with the same size and a plurality of groups of cams with the same shape, lift and different angular positions on one shaft in a similar mode, and the traditional camshaft is formed into an integral camshaft by casting or is formed by turning a steel piece; at present, the camshaft of a common light fuel engine is cast into a whole by nodular cast iron or chilled cast iron, the cam and the shaft on the camshaft are cast and formed by the same material, and the required oil duct is manufactured by a method of drilling through holes. The method can meet the general requirements of the fuel oil engine, but has the disadvantages of heavy manufacturing weight, large processing amount, manual drilling of the axial through hole, high processing difficulty and energy and labor cost consumption.

In addition, a camshaft can be processed by combination welding, the cam and the bearing ring are prefabricated, but welding is needed, and although the prefabricated cam can save certain processing cost and materials, the weight is light. However, because the connection mode is welding, the welding precision is poor and the welding difficulty is high after the cam is positioned, and meanwhile, the hardness of the welded cam is attenuated.

In order to solve the above problems, a novel combined camshaft has been developed.

Disclosure of Invention

The utility model aims at providing a modular camshaft in order to solve above-mentioned problem.

The utility model discloses a following technical scheme realizes above-mentioned purpose:

an assembled camshaft comprising:

a cam core tube;

at least one cam;

at least one bearing ring; the cam and the bearing ring are provided with inner hole pull grooves, the cam core pipe is provided with mounting position knurls, and the cam and the bearing ring are extruded and sleeved on the mounting position knurls of the cam core pipe through the inner hole pull grooves.

The beneficial effects of the utility model reside in that:

the utility model relates to a combined camshaft;

the cam core tube, the cam and the bearing ring which are prepared separately are adopted, and the cam core tube, the cam and the bearing ring are matched and combined to form a combined cam shaft;

the total amount of the camshaft assembly is effectively reduced by adopting a method of mounting the prefabricated cam and the bearing shaft on the prefabricated cam core pipe, and meanwhile, the prefabricated cam becomes a thin-walled disc sleeve part, so that the processing time of heat treatment is effectively reduced; the cam core pipe adopts a cold-drawn steel pipe in advance, so that the whole processing amount of the cam shaft can be effectively reduced.

The application can effectively solve the total amount and the processing difficulty of the existing integral camshaft and improve the production efficiency.

Drawings

FIG. 1 is a front view of the structure of the present application;

FIG. 2 is a left side view of the structure of the present application;

FIG. 3 is a front view of the cam core tube of the present application;

FIG. 4 is a left side view of the cam core barrel construction of the present application;

FIG. 5 is a front view of the structure of a bearing ring of the present application;

FIG. 6 is a left side view of the structure of a bearing ring of the present application;

FIG. 7 is a front view of the cam of the present application;

fig. 8 is a left side view of the structure of the cam in the present application.

In the figure: 1. a cam core tube; 2. a cam; 3. a bearing ring; 9. an inner hole of the cam core pipe; 10. drawing a groove in an inner hole of the bearing ring; 11. drawing a groove in an inner hole of the cam; 12. and (6) knurling.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings:

as shown in fig. 1-8;

an assembled camshaft comprising:

a cam core tube 1;

at least one cam 2;

at least one bearing ring 3; the cam 2 and the bearing ring 3 are both provided with inner hole pull grooves, the cam core pipe 1 is provided with mounting position knurls 12, and the cam 2 and the bearing ring 3 are extruded and sleeved on the mounting position knurls 12 of the cam core pipe 1 through the inner hole pull grooves.

As shown in fig. 4, the cam core barrel bore 9 is shown.

In some embodiments, 3 cylinders of a camshaft have 6 cams 2, 4 cylinders of the camshaft have 8

cams

2, 6 cylinders of the camshaft have 12 cams 2, and the cams 2 can drive the opening and closing of the air inlet and outlet valves through the jacking tappet to complete air inlet and outlet; the shaft neck is generally provided with a shaft neck between the two ends of the camshaft and the two cams 2, and the shaft neck has the function of being installed with the machine shell and stabilizing the camshaft rotating at high speed;

in some embodiments, at least one cam 2 is mounted at a predetermined angular position.

In some embodiments, the angle between the 4-cylinder machine cam 2 is generally 90⁰+/-15 ', the angular position progress required by the assembly is realized by adopting a method of ensuring +/-30 ' by the rotation of a static pressure main shaft head of a machine tool and ensuring +/-15 ' by fine grinding;

in some embodiments, the cam core tube 1 is cold drawn from a steel tube having a hardness of HV210 or more and a tensile strength of 700MPa or more. The cam core tube 1 is cold-drawn by adopting a steel tube, so that the total amount of solid casting materials is effectively reduced except that the mechanical property requirement of a base material is met, and a condition is created for reducing the total quality of the cam shaft.

In some embodiments, cam core tube 1 is a 40Cr steel tube or a 5 gauge steel tube or an E355 steel tube cold drawn.

The manufacturing approach of the combined camshaft, the cam core tube 1 is prefabricated; according to the size requirement, selecting a steel pipe with the hardness of more than or equal to HV210 and the tensile strength of more than or equal to 700Mpa, and cold-drawing the steel pipe to obtain a cam core pipe 1; knurling 12 is carried out on the surface of the cam core tube 1 where the cam 2 and the bearing ring 3 are required to be installed; the width of the knurl 12 is slightly adjusted according to the difference of the installation shaft diameter and the width of the cam 2, and the rolling is adjusted according to the product structure;

prefabricating a bearing ring 3; according to the size requirement, a ring made of medium carbon steel material is selected, a bore hole is formed in the bearing ring 3, and an inner hole is formed by drawing a groove;

in some embodiments, the drawing groove generally adopts 32 or 36 teeth, has the depth of 0.1CM-0.2CM, is determined according to the inner hole and the product structure, and aims to increase the tensile stripping force and the fatigue strength between the cam core tube 1 and the cam 2 after static pressure;

prefabricating a cam 2; the cam is manufactured by boring the inner hole of the cam 2 and drawing the groove of the inner hole;

as shown in fig. 6 and 8, bearing ring bore grooves 10, cam bore grooves 11 are shown.

Assembling; the natural matching is completed through the assembly mode that the knurls 12 of the cam core tube 1 are respectively extruded and deformed with the inner hole pull grooves 10 of the bearing ring and the inner hole pull grooves 11 of the cam.

In some embodiments, knurling 12 is carried out on the surface of the cam core tube 1 at the position where the cam 2 and the bearing ring 3 are required to be installed through a knurling 12 machine;

boring and grooving the bearing ring 3 and the cam 2 through a boring machine and a grooving machine;

the cam core tube 1 is sent to a static pressure machine tool, then the bearing ring 3 or the prefabricated cam 2 is placed at a part fixing position below the machine tool, the cam core tube 1 is driven to move downwards by a hydraulic head of the static pressure machine tool, the cam core tube 1 is pressed into the bearing ring 3 or the cam 2, and the bearing ring 3 or the cam 2 is extruded and sleeved at the position of the corresponding knurling 12 on the cam core tube 1 to form the combined type cam shaft.

The cam 2 is a function key of a camshaft, has the same shape, base circle and lift, and is only distributed on the camshaft at different angular positions. For the cam 2 on the camshaft, the functional requirements of the assembly can be met as long as the prefabricated cam 2 can be ensured to be installed correctly and can be effectively prevented from loosening and sliding. The hardness of the prefabricated cam 2 is required to be more than or equal to 53RHC, and the hardness can meet the product requirement.

The method aims at the requirements of higher hardness and good wear resistance of the prefabricated cam 2, 42CrMocliao has no obvious temper brittleness, and the method is particularly suitable for induction quenching, wherein the tensile strength is more than or equal to 1080MPa, the yield strength is more than or equal to 930MPa, the elongation is more than or equal to 12, and the hardness reaches 54-60HRC after heat treatment. Aiming at the material characteristics, the continuous quenching method of the prefabricated cam 2 is adopted, and the tempering treatment is immediately carried out after the quenching, so that the cracking tendency is effectively prevented, and the stable performance of the product is ensured.

In order to ensure the fastness of the combined camshaft, before assembly, the bearing ring 3 and a prefabricated automatic processing machine tool need to be finely bored with an inner hole and a drawing matching groove so as to increase the fastness of an assembly after assembly.

Assembling;

the components are prepared completely, the mechanical arm sends the cam core tube 1 to a knurling 12 machine, the knurling 12 machine firstly performs knurling 12 on a preset core tube part, then the bearing ring 3 or the prefabricated cam 2 is placed on a part position below a machine tool, a hydraulic head of a static pressure machine tool drives the cam core tube 1 to move downwards, and the cam core tube 1 is pressed into the bearing ring 3 or the cam 2 to form the camshaft assembly. The camshaft assembly is completed by repeatedly and successively press-fitting the bearing ring 3 or the cam 2. Through static pressure, the bulges of the knurls 12 of the cam core tube 1 and the pull grooves of the inner holes of the bearing ring 3 or the prefabricated cam 2 are extruded and deformed, so that the installation is firmer.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An assembled camshaft, comprising:

a cam core tube;

at least one cam;

2. The assembled camshaft of claim 1 wherein at least one of the cams is mounted at a predetermined angular position.

3. The assembled camshaft of claim 1, wherein the camshaft mandrel is cold drawn from a steel tube having a hardness of HV210 or more and a tensile strength of 700MPa or more.

4. The assembled camshaft of claim 3, wherein the cam core tube is made of a 40Cr steel tube, a 5 # steel tube or an E355 steel tube by cold drawing.