GB2115098A - A built-up camshaft assembly and method for manufacturing it - Google Patents
A built-up camshaft assembly and method for manufacturing it Download PDFInfo
- Publication number
- GB2115098A GB2115098A GB08204611A GB8204611A GB2115098A GB 2115098 A GB2115098 A GB 2115098A GB 08204611 A GB08204611 A GB 08204611A GB 8204611 A GB8204611 A GB 8204611A GB 2115098 A GB2115098 A GB 2115098A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cam
- cam shaft
- fitting
- oil
- pin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 238000005245 sintering Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005304 joining Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009877 rendering Methods 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/0894—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with other than axial keys, e.g. diametral pins, cotter pins and no other radial clamping
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H53/00—Cams or cam-followers, e.g. rollers for gearing mechanisms
- F16H53/02—Single-track cams for single-revolution cycles; Camshafts with such cams
- F16H53/025—Single-track cams for single-revolution cycles; Camshafts with such cams characterised by their construction, e.g. assembling or manufacturing features
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
Abstract
A method for manufacturing a built-up camshaft assembly by inserting a fitting pin (41) into oil holes formed in a fitting member (3) such as cam or journal and a hollow cam shaft (1) bridging therebetween and a built- up camshaft assembly manufactured by this method. <IMAGE>
Description
SPECIFICATION
An integral cam-cam shaft assembly and a method for manufacturing it
The present invention relates to an integral cam-cam shaft assembly and a method for manufacturing the same.
There have been heretofore proposed a variety of the methods for manufacturing the cam-cam shaft assembly by integrally assembling onto the outer surface of the hollow or solid steel cam shaft the cams formed separately therefrom. Among them, it is most popular method that the number of grooves corresponding to the number of the cam phases are provided onto the outer circumference of the cam shaft, while each of the cam pieces formed separately from the cam shaft is provided with a projection for the corresponding groove, whereby the cam shaft and the cam pieces are securely assembled together while the projections are fitted onto the corresponding grooves respectively. However, substantial working and cost therefor are required because the grooves are formed onto the outer surface of the cam shaft and additionally the oil holes necessary for lubrication must be bored.Therefore, improvement on such points has been desired for this type of integral cam-cam shaft assembly.
According to the present invention, a fitting member such as cam, journal etc. and the cam shaft are securely assembled together by inserting a fitting pin into the oil holes bored in the fitting member and the cam shaft thereby bridging therebetween.
An advantage of the present invention is that it makes it possible to provide an integral cam-cam shaft assembly and a method for manufacturing the same which enable the cam and cam shaft to be firmly assembled together without relying upon the provision of grooves and projections on the cam shaft and cam respectively.
More specifically, the present invention makes it posible to provide a cam-cam shaft assembly and a method for manufacturing the same utilizing oil holes indispensable for lubrication from the standpoint of functioning of the engine and which are provided in the cam-cam shaft assembly, thereby rendering unnecesary the provision of grooves on the cam shaft, which are unnecessary for the functioning of the engine.
Embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which Figure 1 is a partial perspective view of an embodiment according to the present invention illustrating an assembled state thereof.
Figure2 is a sectional view of an embodiment according to the present invention.
Figures 3A and B are perspective views of fitting pins to be held in oil holes.
Figure 4 is a sectional view illustrating another embodiment according to the present invention.
Figure 5 is a partially broken view of the embodiment shown in Figure 4.
According to the present invention, a fitting member such as a cam and a journal is assembled onto the outer circumference of a hollow cam shaft having an oil passage therein in an axial direction while an oil hole (through hole) which is radially bored penetrating through the wall of the fitting member is aligned with an oil hole (through hole) which is radially bored penetrating through the wall of the cam shaft so that the oil passage may be communicated with the outside of the fitting member via the oil holes; and then the fitting member and the cam shaft are securely and integrally assembled together by inserting a fitting pin into the holes bridging therebetween.
The present invention will be explained more in detail with reference to the drawing.
Now referring to Figure 1 being a perspective view of an integral cam-cam shaft assembly according to the present invention, reference numeral 1 is a cam shaft, reference numerals 2 and 3 fitting member, i.e., a cam piece and a journal piece respectively which are securely assembled onto the outer circumference of the cam shaft. The pipe-like cam shaft is made of machine structural steel pipe the interior of which is used as an oil passage. The cam piece and the journal piece are provided with oil holes (through holes) which constitute an oil pasage 1'. Each of the cam and the journal is assembled onto the cam shaft by inserting a fitting pin into the oil holes provided penetrating through the wall of the cam shaft and the cam piece or journal piece.
Figure 2 illustrates an embodiment according to the present invention. The pipe 1 is press-fitted into the journal 3, and as shown in Figure 3A, a hollow cylindrical fitting pin 41 is press-fitted into the holes provided respectively in the cam shaft 1 and the journal piece 3 while bridging between both of the holes, whereby the pin serves to strengthen the securing of the cam shaft and the journal piece in the thrust and radial directions of the journal piece. The hollow portion of fthe fitting pin 41 serves as an oil hole.
As to the material constituting the cam shaft and the journal piece, the cam shaft 1 may be made of the steel STKM 17C (its hardness Hv being more than 200), while the journal 3 may be made of the steel SCM 40 (its hardness Hv being more than 300). The fitting pin 41 may be made of SK5 (its HrC being 45-50).Although not restricted to any specific dimension, the dimensions of the shaft, the journal and the fitting pin may be set as follows:
Outer diameter of the cam shaft ........................................ 28 mm in diameter
Press-in allowance of the inner
circumference of the journal 3 ........................................ 0.05 mm in radial direction
Inner diameter of the fitting pin 41 ........................................ 5 mm in diameter
Outer diameter of the fitting pin 41 ........................................ 6.5 mm in diameter
Press-in allowance between the fitting pin and cam shaft or journal 0.01 ........................................ 0.01 mm in diameter Figure 4 illustrates another embodiment according to the present invention in which the cam piece 2 is made of a sintered alloy.In this embodiment, it is difficult from the standpoint of mechanical strength to press-fitthe cam piece onto the cam shaft unlike in the case of the journal piece. Therefore, the cam piece is loose-fitted onto the cam shaft while a clearance between them is remained, and then the fitting pin 42 provided with a slit as shown in Figure 3B (hereinafter referred to as "slit pin") is inserted into the oil holes 1' and 2' while both the oil holes are aligned together with each other.
Figure 5 is an radially sectional view illustrating the relationship between the oil holes of the cam shaft and the cam piece. In this embodiment, the pin 42 is fitted into the oil hole of the cam piece 2 with a clearance remained between the inner circumference of the oil holes of the cam piece and the outer circumference of the slit pin, while the fitting pin 42 is press-fitted into the oil hole of the cam shaft.As to the material, the cam piece 2 may be made of a sintered wear-resistant alloy (Fe-5% Cr-1% Mo-2% Cu-1% Si-0.5% P-2.5% C, that is, the alloy being made of 5% Cr, 1% Mo, 2% Cu, 1% Si, 0.5% P, and 2.5% C with Fe being balance) having the hardness of Hv(10Kg) 150 - 300 at the time of assembling; the slit pin 42 is made of SCP 28. The pipe 1 is radially spaced from the cam piece 2 by from 0.05 to 0.5 mm so that the diffusion-joining may be carried out by sintering after assembling the cam piece 2 onto the cam shaft 1. The press-in allowance between the pipe 1 and the slit pin 42 may be set to 0.2 mm in a radial direction due to the slit pin 42 buffering the press-in load.
On the other hand, the slit pin 42 is assembled to the cam piece with a allowance remained therebetween by from 0.01 to 0.03 mm in a radial direction so that the diffusion-joining accompanied with contraction by sintering may be carried out for the purpose of diminishing the thrust-direction pitch and error in cam phase.
The outer diameter of the slit pin 42 is 3 mm and the inner diameter of the oil hole of the slip pin is 1.7 mm in diameter.
According to the present invention, the fitting member such as journal and cam piece are assembled onto the cam shaft utilizing the oil holes which are bored in the fitting member and the cam shaft while penetrating through the wall of the fitting member and through the wall of the cam shaft respectively. Thus, the work for providing the grooves onto the cam shaft can be omitted, thereby rendering the present method easier than the conventional ones.
Furthermore, when the fitting pin having an oil hole therein in a longitudinal direction is employed for securely assembling the fitting member and the cam shaft together, the holes 1 2', 3' can be more easily bored in the fitting member and the cam shaft because the holes into which the fitting pin is inserted is a slightly larger than those in the conventional cam-cam shaft assembly which are difficult to bore due to its smaller diameter. This also makes the present method easier.
While there has been described the preferred embodiments of the present invention, obviously modification and variations are possible in light of the above teachings. It is therefore, to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
Claims (9)
1. A method for manufacturing an integral cam-cam shaft assembly by integrally assembling a fitting
member having an oil hole penetrating the wall thereof onto the outer circumference of a hollow cam shaft
having an oil passage therein in an axial direction and an oil hole penetrating the wall thereof, comprising the steps of:
fitting said fitting member onto said cam shaft such that said oil hole of the fitting member are aligned with said oil hole of the cam shaft to communicate the oil passage and the outer circumference of the fitting
member; and,
inserting a fitting pin into said oil holes such that said fitting pin bridges between the fitting member and the cam shaft so as to securely assemble the cam and the cam shaft.
2. A method for manufacturing an integral cam-cam shaft assembly as claimed in Claim 1, wherein said fitting pin is press-inserted into the oil holes of the fitting member and the cam shaft.
3. A method for manufacturing an integral cam-cam shaft assembly as claimed in Claim 1, wherein said
fitting member is a cam piece, and said fitting pin is a slit pin having a slit over the entire length thereof in a
longitudinal direction, whereas said insertion of the slit pin is followed by sintering after the slit pin is
inserted into the oil holes while a clearance exist between the outer circumference of the slit pin and the
inner circumference of the oil hole of the cam piece.
4. An integral cam-cam shaft assembly comprising:
a cam shaft having an oil passage therein in an axial direction and an oil hole penetrating through the wall thereof from the outer circumference to the oil passage;
a fitting member mounted onto the outer circumference of said cam shaft, said fitting member having an
oil hole penetrating the wall thereof fom the outer circumference to the inner circumference thereof and said
oil hole of the fitting member being aligned with said oil hole of the cam shaft so as to communicate the outer circumference of the fitting member and the oil passge via said oil holes; and
a fitting pin inserted into said oil holes bridging therebetween so that the fitting member is integrally and securely assembled onto the circumference of the cam shaft.
5. An integral cam-cam shaft assembly as claimed in Claim 4, wherein said fitting pin has an oil hole in a longitudinal direction for communicating the outside of the fitting member with the oil passage of the cam shaft.
6. An integral assembled cam-cam shaft assembly as claimed in Claim 4 or 5, wherein said fitting pin is of hollow type.
7. An assembled cam-cam shaft composite as claimed in Claim 4, wherein said fitting pin is provided with a slit extending over the entire length thereof in a longitudinal direction.
8. A method for manufacturing an integral cam-cam shaft assembly, substantially as herein before described with reference to the drawings.
9. An integral cam-cam shaft assembly, substantially as hereinbefore described with reference to, and as illustrated in, Figure 1 or Figures 2 and 3A or Figures 3B, 4 and 5 of the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08204611A GB2115098B (en) | 1982-02-17 | 1982-02-17 | A built-up camshaft assembly and method for manufacturing it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08204611A GB2115098B (en) | 1982-02-17 | 1982-02-17 | A built-up camshaft assembly and method for manufacturing it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2115098A true GB2115098A (en) | 1983-09-01 |
| GB2115098B GB2115098B (en) | 1985-09-04 |
Family
ID=10528394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08204611A Expired GB2115098B (en) | 1982-02-17 | 1982-02-17 | A built-up camshaft assembly and method for manufacturing it |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2115098B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114054230A (en) * | 2020-07-30 | 2022-02-18 | 马勒国际有限公司 | Method for producing a jet channel in a shaft tube |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112324810B (en) * | 2020-11-03 | 2022-07-22 | 中国航发湖南动力机械研究所 | Positioning and anti-loosening device for rotating shaft and mounting method |
-
1982
- 1982-02-17 GB GB08204611A patent/GB2115098B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114054230A (en) * | 2020-07-30 | 2022-02-18 | 马勒国际有限公司 | Method for producing a jet channel in a shaft tube |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2115098B (en) | 1985-09-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |