CN206111259U - Thermal coupling camshaft - Google Patents
Thermal coupling camshaft Download PDFInfo
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- CN206111259U CN206111259U CN201621169936.8U CN201621169936U CN206111259U CN 206111259 U CN206111259 U CN 206111259U CN 201621169936 U CN201621169936 U CN 201621169936U CN 206111259 U CN206111259 U CN 206111259U
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- cam
- camshaft
- injection pump
- shaft body
- thermal coupling
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Abstract
The utility model discloses a thermal coupling camshaft, including camshaft body and the cam of suit on the camshaft body, the camshaft body be the cast iron body, and the cam includes the oil pump cam by GCr15 material producing, and the one end of camshaft body is equipped with cylindrical guiding section, cylindrical guiding section's the marginal circular arc transition face that is in outer end, cylindrical guiding section's external diameter summary is greater than the pilot hole diameter of oil pump cam, the oil pump cam with the hot -pressing mode suit on cylindrical guiding section. The camshaft body of camshaft adopts the relatively poor but cast iron material of low price of hardness, and the oil pump cam adopts very high but the GCr15 material that the price is more expensive of hardness, has reduced the cost of whole product when satisfying the high rigidity that the oil pump cam required because of the high frequency friction, form interference fit at the hookup location of camshaft body and oil pump cam, realized location accuracy, firm in connection, intensity reliably, the purpose of operating be convenient for.
Description
Technical field
This utility model is related to a kind of camshaft, more particularly to the nonhomogeneous hardness of a kind of cam shaft body and cam is larger
Thermal coupling camshaft.
Background technology
Camshaft is a part in piston engine, and its effect is unlatching and the closed action for controlling valve；It is convex
The main body of wheel shaft be one with the approximately uniform barred body of air cylinder group length, commonly referred to as cam shaft body, above cam shaft body
Each and every one cams many are set with, for driving valve.
At present, camshaft mainly includes cast iron cam shaft and camshaft of steel component, homogenous material is, in cam shaft body
The cam of suit is using threaded connection or room temperature press-in connection.In some application scenarios, camshaft is often rotated one week, camshaft sheet
With other component contacts once, and the convex tappet of some cams is needed with other component contacts repeatedly for the convex tappet of body itself, than
Such as, the convex tappet for driving the cam of injection pump of cubic oil pump valve needs and other component contacts four times, so convex to oil pump
The hardness requirement of wheel is high.
It is general using identical and hard with regard to high principle, i.e. the selection of material on material selection aborning for the problems referred to above
The very big cam shaft body of degree and cam of injection pump, the cam shaft body of such commaterial and cam of injection pump are easy to connect and are connected
Connect stable, but cost can be increased；In addition, may also be employed by the cam shaft body and other high rigidity materials of the cast iron manufacture of low cost
The cam of injection pump of material manufacture, can so meet reduces cost and hardness meets the purpose of application demand, but by two kinds of hardness
Different materials links together and is less susceptible to, if press-fiting connection using conventional threads connection or room temperature, there is connection steady
Qualitative difference or the great problem of connection difficulty, can reduce the total quality of camshaft.
Utility model content
The purpose of this utility model is that and provide a kind of cam shaft body and cam material in order to solve the above problems
The thermal coupling camshaft of different and stable connection.
This utility model is achieved through the following technical solutions above-mentioned purpose：
A kind of thermal coupling camshaft, including cam shaft body and the cam being set in the cam shaft body, it is described convex
Wheel shaft body is cast iron body, and the cam includes the cam of injection pump made by GCr15 materials, one end of the cam shaft body
Cylindrical boot segment is provided with, the outer end edges of the cylindrical boot segment are arc-shaped transitional surface, outside the cylindrical boot segment
Footpath is slightly larger than the assembling bore dia of the cam of injection pump, and the cam of injection pump is set in by the pilot hole of itself with hot pressing mode
On the cylindrical boot segment.GCr15 be a kind of alloy content it is less, with superperformance, most widely used high carbon chromium axle
Steel is held, can also be replaced with materials such as CF53 steel in this utility model, but with GCr15 as optimum.
In said structure, cylindrical boot segment is to design to install the cam of injection pump of different materials and specially, outside it
End margin adopts arc-shaped transitional surface, is to facilitate access for when cam of injection pump is press-fited in the pilot hole of cam of injection pump；Cylinder
The external diameter of boot segment, slightly larger than the assembling bore dia of cam of injection pump, is in order in the link position of cam shaft body and cam of injection pump
Interference fit is formed, the purpose being stably connected with is reached；Cam of injection pump is set on cylindrical boot segment with hot pressing mode, is to utilize
The principle expanded with heat and contract with cold realizes the purpose being stably connected with.
Further, the cam shaft body is respectively arranged at two ends with internal taper hole, the center line overlap of two internal taper holes；
One of internal taper hole is just located at the outer end of cylindrical boot segment.This structure is easy to be pin-pointed to cam shaft body vertically
Direction is simultaneously concentric with cam of injection pump, is easy to cam of injection pump is set on cylindrical boot segment with hot pressing mode.
Preferably, the angle between the centrage of the hole wall of the internal taper hole and the cam shaft body is 30 °.
Preferably, the external diameter of cylindrical boot segment 0.03- bigger than the assembling bore dia of the cam of injection pump
0.07mm.Empirical tests, this magnitude of interference scope is able to ensure that stable connection after being pressed into and cool down after heating.
According to needs are applied, the signal wheel and intake and exhaust cam of same centrage are additionally provided with the cam shaft body, these
For customary cam, concrete mounting structure explanation is not made here.
The beneficial effects of the utility model are：
The cam shaft body of camshaft described in the utility model adopts hardness poor but low-cost cast iron materials, oil pump
Cam is meeting the high rigidity that cam of injection pump is required because of high frequency friction using the very high but expensive GCr15 materials of hardness
While reduce the cost of whole product, and coordinated using cylindrical boot segment and cam of injection pump and realize high-quality hot coupling
Combined pressure fill, cam shaft body and cam of injection pump link position formed interference fit, realize accurate positioning, be connected firmly,
Intensity reliability, the purpose for being easy to operation.
Description of the drawings
Fig. 1 is the axial sectional view of the cam shaft body of thermal coupling camshaft described in the utility model；
Fig. 2 is the axial sectional view of the cam of injection pump of thermal coupling camshaft described in the utility model；
Fig. 3 is the axial sectional view of thermal coupling camshaft described in the utility model；
Fig. 4 is the upward view of thermal coupling camshaft described in the utility model.
Specific embodiment
Below in conjunction with the accompanying drawings the utility model is described in further detail：
As Figure 1-Figure 4, thermal coupling camshaft described in the utility model includes cam shaft body 2 and located at camshaft sheet
Cam on body 2, cam shaft body 2 is cast iron body, and the cam includes the signal wheel 8 of same centrage, the and of intake and exhaust cam 9
The cam of injection pump 6 made by GCr15 materials, is arranged on cam shaft body 2 after signal wheel 8 is separately machined, intake and exhaust cam 9 is direct
It is cast in cam shaft body 2, one end (lower end in Fig. 1-Fig. 3) of cam shaft body 2 is provided with cylindrical boot segment 4, cylinder
The outer end edges of shape boot segment 4 are arc-shaped transitional surface 5, and the external diameter of cylindrical boot segment 4 is slightly larger than the pilot hole 7 of cam of injection pump 6
Diameter, and the external diameter 0.03-0.07mm bigger than the diameter of the pilot hole 7 of cam of injection pump 6 of cylindrical boot segment 4, cam of injection pump 6
It is set on cylindrical boot segment 4 with hot pressing mode by the pilot hole 7 of itself；Being respectively arranged at two ends with for cam shaft body 2 is interior
Taper hole 1, the center line overlap of two internal taper holes 1, one of internal taper hole 1 is just located at outer end (Fig. 1-figure of cylindrical boot segment 4
Lower end in 3), the angle between the hole wall of internal taper hole 2 and the centrage of cam shaft body 2 is 30 °.
Using when, cam shaft body 2 drives cam of injection pump 6 to rotate, and the convex tappet of cam of injection pump 6 drives cubic oil pump valve
And high-frequency resistance friction, the high hardness material of cam of injection pump 6 guarantees that its is stable and with enough service life.
It is below in conjunction with the accompanying drawings and real in order to verify to the Machinability Evaluation of thermal coupling camshaft described in the utility model
Apply example to be specifically described the preferred thermal coupling methods that thermal coupling camshaft described in the utility model is adopted, but following thermal couplings
Method not unique method, nor protection object of the present utility model.
As Figure 1-Figure 4, the thermal coupling methods that thermal coupling camshaft described in the utility model is adopted are used for oil pump is convex
Wheel 6 is set on the cylindrical boot segment 4 of cam shaft body 2 with hot pressing mode, is comprised the following steps：
(1) the cam shaft body 2 without fine grinding and cam of injection pump 6 are prepared；
(2) in the case of the external diameter 0.05mm bigger than the diameter of the pilot hole 7 of cam of injection pump 6 of cylindrical boot segment 4, will
Cam of injection pump is heated to 180 DEG C and is kept for 5 minutes, calculates with specific reference to below equation：
A=3600 × C × 0.06/ (C+0.01), B=100 × C × 0.06/ (C+0.01),
Wherein, A represent cam of injection pump 6 heat after keep temperature, its unit for DEG C, B represents temperature retention time, and its unit is
Minute, C represents the external diameter of the cylindrical boot segment numerical value bigger than the diameter of the pilot hole 7 of cam of injection pump, and its unit is mm；
(3) cam of injection pump 6 is placed on the location-plate of positioning tool (not shown), makes the centre bore 7 of cam of injection pump 6
Centrage keep vertical, cam of injection pump 6 is fixed on the location-plate of positioning tool；
(4) cam shaft body 2 is placed on vertically downward on cam of injection pump 6 and spacing, the camshaft sheet by positioning tool
The outer end edges of the cylindrical boot segment 4 of body 2 contact with the hole wall of the pilot hole 7 of cam of injection pump 6 and make cylindrical boot segment 4 with
Cam of injection pump 6 is concentric；(it is other conventional fitment using the internal taper hole 1 and keyway at the two ends of cam shaft body 2 in this step
Structure, does not show in figure) coordinate the mode for positioning to realize the perpendicular positioning of cam shaft body 2；
(5) cam shaft body 2 is from top to bottom pressed by hydraulic press (not shown), pressure pressure is 3.5Mpa, is made
Cylindrical boot segment 4 unclamps the hydraulically operated fixture of hydraulic press completely in the pilot hole 7 of cam of injection pump 6；
(6) cool down after taking out cam shaft body 2 and cam of injection pump 6 from positioning tool, that is, complete the He of cam shaft body 2
The thermal coupling connection of cam of injection pump 6, then to cam shaft body 2 and cam of injection pump 6 carries out fine grinding process again；It is cold in this step
When but, 95 DEG C are first naturally cooled to, then 55 DEG C are quickly cooled to by air-cooled, air quantity is not less than 6000m3/ h is finally natural again
It is cooled to room temperature.
The camshaft for finally obtaining, connects highly stable between its cam shaft body 2 and cam of injection pump 6, and is integrally formed
Structure it is substantially similar, and whole process is time-consuming shorter, easy to operate, illustrates thermal coupling camshaft described in the utility model just
In processing, application and popularization.
Above-described embodiment is preferred embodiment of the present utility model, is not the limit to technical solutions of the utility model
System, as long as the technical scheme that can be realized on the basis of above-described embodiment without creative work, is regarded as falling into
In the rights protection scope of this utility model patent.
Claims (5)
1. a kind of thermal coupling camshaft, including cam shaft body and the cam being set in the cam shaft body, its feature exists
In：The cam shaft body is cast iron body, and the cam includes the cam of injection pump made by GCr15 materials, the camshaft
One end of body is provided with cylindrical boot segment, and the outer end edges of the cylindrical boot segment are arc-shaped transitional surface, the cylinder
, slightly larger than the assembling bore dia of the cam of injection pump, the cam of injection pump is by the pilot hole of itself with hot pressing for the external diameter of boot segment
Mode is set on the cylindrical boot segment.
2. thermal coupling camshaft according to claim 1, it is characterised in that：The cam shaft body is respectively arranged at two ends with
Internal taper hole, the center line overlap of two internal taper holes.
3. thermal coupling camshaft according to claim 2, it is characterised in that：The hole wall of the internal taper hole and the camshaft
Angle between the centrage of body is 30 °.
4. the thermal coupling camshaft according to claim 1,2 or 3, it is characterised in that：The external diameter of the cylindrical boot segment
0.03-0.07mm bigger than the assembling bore dia of the cam of injection pump.
5. the thermal coupling camshaft according to claim 1,2 or 3, it is characterised in that：It is additionally provided with the cam shaft body
With the signal wheel and intake and exhaust cam of centrage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621169936.8U CN206111259U (en) | 2016-11-02 | 2016-11-02 | Thermal coupling camshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621169936.8U CN206111259U (en) | 2016-11-02 | 2016-11-02 | Thermal coupling camshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206111259U true CN206111259U (en) | 2017-04-19 |
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ID=58525671
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621169936.8U Active CN206111259U (en) | 2016-11-02 | 2016-11-02 | Thermal coupling camshaft |
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| CN (1) | CN206111259U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337703A (en) * | 2016-11-02 | 2017-01-18 | 成都西菱动力科技股份有限公司 | Thermal coupled cam shaft and thermal coupling method |
-
2016
- 2016-11-02 CN CN201621169936.8U patent/CN206111259U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106337703A (en) * | 2016-11-02 | 2017-01-18 | 成都西菱动力科技股份有限公司 | Thermal coupled cam shaft and thermal coupling method |
| CN106337703B (en) * | 2016-11-02 | 2018-07-20 | 成都西菱动力科技股份有限公司 | A kind of thermal coupling camshaft and thermal coupling methods |
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