CN208089364U - A kind of hollow camshaft - Google Patents
A kind of hollow camshaft Download PDFInfo
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- CN208089364U CN208089364U CN201820222330.9U CN201820222330U CN208089364U CN 208089364 U CN208089364 U CN 208089364U CN 201820222330 U CN201820222330 U CN 201820222330U CN 208089364 U CN208089364 U CN 208089364U
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Abstract
The utility model is related to a kind of hollow camshafts, and make its further lightweight while ensuring its intensity.The hollow camshaft (20), has：Main shaft (21) has to axially extending hollow part (10)；Collar (23) and cam part (22), along the axial interruption configuration of main shaft (21)；Internal thread part (11) is formed in the inner surface of the hollow part of axial one end, wherein hollow part (10) has：Changes of section portion (13) is expanding closer to another side, sectional area from one end towards another side compared with internal thread part (11)；Big cross-section (16) is more than internal thread part (11) compared with changes of section portion (13) in the whole region of another side, sectional area.Wherein, big cross-section (16), has：Plug embedded division (15), is formed in the axial other end；Constant cross-section portion (14) is continued from changes of section portion (13) to plug embedded division (15) with same cross-sectional.
Description
Technical field
The utility model is related to the hollow camshafts that a kind of inside has hollow part.
Background technology
As driving engine valve actuating mechanism camshaft, in order to mitigate weight, sometimes using inside it have from
Axial one end to the hollow part of the other end hollow camshaft.
The hollow camshaft is generally fabricated by using the casting method of core.It is configured in a template by sand mo(u)ld
Etc. compositions core, injection molten metal and metal freezing after, by the modes such as blasting treatment remove core (for example,
Referring to patent document 1).
【Patent document 1】Japanese Patent Laid-Open 2001-105100 bulletins
Utility model content
Utility model technical problem to be solved
However, in the axial end portion of camshaft, it is formed with the internal thread for installing gear and sprocket wheel, belt pulley etc.
Portion.The internal thread part, the end in axial arbitrary side, is formed in the inner surface of hollow part, and be used to make to be inserted into gear with
And the fixed-use bolt of sprocket wheel, belt pulley etc. is screwed into wherein.
Herein, in order to realize the further lightweight of camshaft, if it is desired to increase the sectional area of hollow part, then with
The threading path for the internal thread part that the increase of sectional area is formed in hollow part inner surface also will increase.Due in internal thread part, in order to
It transmits rotation and acts on larger stress, so if the threading path of internal thread part increases, then in order to ensure intensity, it is necessary to increase
The outer diameter of camshaft around internal thread part.For this purpose, may not necessarily realize the light of camshaft if even if increasing the sectional area of hollow part
Quantization.
Therefore, the project of the utility model be related to a kind of hollow camshaft, and make while ensuring its intensity its into
One step lightweight.
In order to solve the above problems, the utility model uses a kind of hollow camshaft, has：Hollow part, to axial direction
Extend；Internal thread part is formed in the inner surface of axial one end of the hollow part, wherein the hollow part has：Section
Change section is expanding closer to another side, sectional area from one end towards another side compared with the internal thread part；Greatly
Cross-section is more than the internal thread part compared with the changes of section portion in the whole region of another side, sectional area.
Herein, the big cross-section may be used such as lower structure, have：Plug embedded division is formed in axial another
One end；Constant cross-section portion is continued from the changes of section portion to the plug embedded division with same cross-sectional.
In addition, sectional area may be used in the widened structure of cone in the changes of section portion.
In these various aspects, it may be used such as lower structure, it is outstanding more axially to form oriented separate axis direction
A protruding portion, the changes of section portion are configured between the opposing end surface of the axial protruding portion adjacent to each other.
It is configured at the cam part for being axially interrupted configuration at this point, the protruding portion may be used or is axially interrupted
The structure of the flange part of the axial both sides of the collar of configuration.
Bottommost in the end face of the protruding portion has, with towards lateral axial bending in radial direction and at its end
The portions R that end is connect with the cylindrical surface of the protruding portion side, the changes of section portion, which may be used, is configured at axial phase each other
Structure between the terminal part in the adjacent portions R.
In addition, the structure for being located at same axial range with the collar may be used in the changes of section portion.
Utility model effect
The utility model is a kind of hollow camshaft, is had from axial one end to axial other end hollow part, and in sky
The inner surface of center portion axial direction one end is formed with internal thread part, wherein hollow part has：Changes of section portion, with internal thread part phase
Than closer to another side, sectional area expands from one end towards another side；Big cross-section, compared with changes of section portion
The whole region of another side, sectional area is more than internal thread part can ensure it since it has a structure in which
Make its further lightweight while intensity.
Description of the drawings
Fig. 1 is the longitudinal section for the hollow camshaft for showing one embodiment of the utility model.
Fig. 2 is the enlarged view of the main part of Fig. 1.
(a) in Fig. 3 and it is (b) chart for comparing the embodiment and conventional example.
Symbol description
3 bolts
5 camshaft pulleys
10 hollow parts
11 internal thread parts
12 interconnecting pieces
13 changes of section portions
14 constant cross-section portions
15 plug embedded divisions
16 big cross-sections
20 hollow camshafts
21 main shafts
22 cam parts
23 collars
24 flange parts
25 identification protrusions
The end faces w
The portions R R
Specific implementation mode
Hereinafter, being illustrated to the embodiment of the utility model based on attached drawing.The hollow camshaft 20 of present embodiment,
Have：Main shaft 21 has to axially extending hollow part 10；Collar 23 and cam part 22, along the axis of main shaft 21
It is configured to interruption；Internal thread part 11 is formed in the inner surface of the hollow part 10 of axial one end.
Hollow part 10 is formed as concentric with the axle center of the i.e. main shaft 21 of axis-shaped component, by axial one end and the other end
End face is open and is set in the axial whole length of main shaft 21.
As shown in Figure 1, in the outer surface of main shaft 21, be axially intermittently formed 5 collars 23, i.e. 23a, 23b,
23c,23d,23e.The cylindrical surface facing with bearing is formed in the outer surface of the collar 23, the bearing is for starting
Hollow camshaft 20 is freely and rotatably supported in the cylinder cap of machine.As bearing arrangement, general sliding bearing plays a role.
In the outer surface for the collar 23 being made of cylindrical surface, divide the camshaft bearing 4 of state, i.e. 4a, 4b, 4c, 4d, 4e equally
It is close to each other and cover the entire around axis circumference of each collar 23, and by its camshaft bearing 4, make hollow camshaft 20 in cylinder cap
It is inside pivoted freely.
In the axial both sides for the collar 23a for being located most closely to axial one end, configured with outside around entire axis circumference
Diameter side flange part 24 outstanding.In the axial both sides of collar 23 in addition to this, configured with the cam around entire axis circumference
Portion 22, i.e. 22a, 22b, 22c, 22d.
Flange part 24 and cam part 22 are, in the outer surface of main shaft 21, to far from axis direction protruding portion outstanding.
These protruding portions are axially interrupted configuration, and the end face w of protruding portion is also acted as pushing away in axially position camshaft bearing 4
The function of power bearing.
Cam part 22 is configured with requirement corresponding with cylinder number.In the present embodiment, such as Fig. 1 institutes
Show, it is corresponding with 4 Cylinder engines.
In axial one end of hollow camshaft 20, camshaft pulley 5 is fixed with by bolt 3.In camshaft pulley 5
On be wound with synchronous belt, and transmit the rotation of bent axle to hollow camshaft 20.Driving hollow camshaft synchronous with the rotation of bent axle
20, rocking arm etc., the valve opening and closing of driving air inlet side, exhaust side, to make engine run are passed through by hollow camshaft 20.
Additionally, there are the valve event of air inlet side and exhaust side is made by 1 hollow camshaft 20, there is also logical
The case where excessive root hollow camshaft 20 makes the valve event of air inlet side and exhaust side respectively.
Inner surface in the axial one end of hollow part 10 is formed with the external screw thread for the bolt 3 for being screwed into fixed camshaft pulley 5
The internal thread part 11 in portion 33.
In addition, hollow part 10 has：Interconnecting piece 12, it is adjacent with the axial another side of internal thread part 11, and with circle
Cylindrical inner surface, also has：Changes of section portion 13, in axial another side, sectional area is from one end towards another side
Expand, also has：Big cross-section 16 is more than interior compared with changes of section portion 13 in the whole region of another side, sectional area
Threaded portion 11.
The section of interconnecting piece 12 is circle, is in axial one before the inner surface of hollow part 10 forms internal thread part 11
Hold continuous state.When foring internal thread part 11 from axial one end using screw tap, thread groove is not formed and as cylinder
The remaining part of inner surface, the interconnecting piece 12 of as Fig. 2.
Big cross-section 16, has：Plug embedded division 15 is formed in the axial other end；Constant cross-section portion 14, from section
Change section 13 to plug embedded division 15 is continued with same cross-sectional.
In plug embedded division 15, for sealing lubrication oil duct, that is, hollow part 10, and inserted with plug.Plug embedded division
15, section is usually formed as than constant cross-section portion 14 greatly, but according to the specification of engine, and section is also possible to be less than and cut
The constant portion in face 14.But plug embedded division 15, compared with the internal diameter of the maximum gauge part of internal thread part 11, i.e., with will be from interior
The distance (radius) in the axle center of tooth bottom point and main shaft 21 between the thread and thread of threaded portion 11 expands as 2 times
Numerical value is compared, and has relatively large internal diameter (diameter).Accordingly, plug embedded division 15, compared with internal thread part 11, sectional area
It is relatively large.
The section in constant cross-section portion 14 is circle, is continued over the entire length with same cross-sectional.Constant cross-section portion 14 it is interior
Diameter (diameter), equally, compared with the internal diameter of the maximum gauge part of internal thread part 11, i.e., with will be from the thread of internal thread part 11
The numerical value that the distance (radius) in the axle center of tooth bottom point and main shaft 21 between thread expands 2 times is compared, and is had opposite
Larger internal diameter (diameter).Accordingly, constant cross-section portion 14, compared with internal thread part 11, sectional area is relatively large.
Changes of section portion 13, from axial one end towards axial another side, sectional area expands in cone.Its circular cone
Angle [alpha] of the busbar of shape relative to axial direction, it is shallower to be preferred from the perspective of inhibiting stress concentration, in particular, conical phase
For axial angle [alpha], it is preferred at 45 ° or less.
In this way, hollow part 10, has：Changes of section portion 13, compared with internal thread part 11 closer to another side, section
Area expands from one end towards another side；Big cross-section 16, in the entire area of another side compared with changes of section portion 13
Domain, sectional area due to such a structure, can without expanding the diameter of internal thread part 11 more than internal thread part 11
So that the total measurement (volume) of the entirety of hollow part 10 is increased, and realizes the lightweight of hollow camshaft 20.That is, due to being not necessarily to make fixed camshaft
The diameter of the bolt 3 of belt pulley 5 increases, so the wall thickness without increasing the hollow camshaft 20 near internal thread part 11,
As a result, making its further lightweight while can ensure 20 intensity of hollow camshaft.
In addition, changes of section portion 13, is configured between opposite end face w, w of axial protruding portion adjacent to each other.
In the present embodiment, as shown in Fig. 2, changes of section portion 13, is configured at axial flange part 24 adjacent to each other
Between end face w and the end face w of cam part 22.That is, changes of section portion 13, is equipped with protruding portion, that is, flange part to outside diameter therebetween
24 and cam part 22 axial range in, not repeat configure.Accordingly, it is suppressed that in the protruding portion for being easy to happen stress concentration
The changes of section of neighbouring main shaft 21, improves its intensity.
The one end (being known as beginning) in changes of section portion 13 and the other end (being known as end), are configured at and axial adjacent to each other
Protruding portion opposite end face w, w are compared and are preferred closer to axially inner side, the range in changes of section portion 13, for example, with symbol in Fig. 2
Range shown in L1 is compared and is preferred closer to inside.
In addition, changes of section portion 13, is configured at the end of the portions the R R of the bottommost setting of axial protruding portion adjacent to each other
It is preferred between end.
The portions R R is in, as shown in Fig. 2, the bottommost of the end face w in protruding portion, with outside towards lateral axis in radial direction
Lateral bend, and the shape that portion is connected with the cylindrical surface of protruding portion side at its end.That is, the portions R R and the interconnecting piece on cylindrical surface are
The terminal part of the portions R R, changes of section portion 13 are configured between the terminal part of the axial portions R R adjacent to each other, for example, being accorded with Fig. 2
Range shown in number L2 is compared closer to inside.As long as in this way, do not make changes of section portion 13 repeat be configured at flange part 24 with it is convex
It is equipped between end face w, w of the protruding portions such as wheel portion 22 and therebetween in the axial range of the portions the R R of the bottommost of its protruding portion, just
It can be further assured that its intensity.
In addition, the distance between the beginning in changes of section portion 13 and the end face w of its beginning side and changes of section portion 13
End and its end side the distance between end face w, as far as possible length be preferred, changes of section portion 13 cone relative to axis
To angle [alpha], as described above, inhibit be preferred at 45 ° or less.
In addition, the axial range in changes of section portion 13, including axial protruding portion adjacent to each other opposite end face w, w it
Between midpoint be preferred, in addition, the distance between end face w of the beginning in changes of section portion 13 and its beginning side and changes of section
The distance between the beginning in portion 13 and the end face w of its beginning side, which are equal to each other, to be preferred.
In addition, the axial range in changes of section portion 13, avoids the knowledge for identifying 20 type of hollow camshaft in appearance
Is not configured and be preferred with the position of protruding portion 25.Alternatively, on the contrary, the axis in changes of section portion 13 is arranged in identification protruding portion 25
It is preferred in axial range except to range.
In the present embodiment, changes of section portion 13 is configured at the end face w and cam of axial flange part 24 adjacent to each other
Between the end face w in portion 22, but in addition to this, for example, it is also possible to which changes of section portion 13 is set to axial direction identical with collar 23
In range.In this case, changes of section portion 13, or be configured at the end face w of axial flange part 24 adjacent to each other with it is convex
Between the end face w of edge 24, alternatively, changes of section portion 13 is configured at the end face w and cam of axial cam part 22 adjacent to each other
Between the end face w in portion 22.
In addition, in the case where being additionally provided with protruding portion except the flange part 24 of collar 23 and cam part 22, section
Change section 13 avoids the protruding portion except its flange part 24 and cam part 22 and is configured at axial protruding portion adjacent to each other
It is preferred between end face w, w.
The hollow camshaft 20 of the utility model, it is identical as common camshaft, it is fabricated by casting method.It is casting
When making, using the core of shape corresponding with hollow part 10, it is configured with core in a template, in injection molten metal and metal
After solidification, core is removed by modes such as blasting treatments, in addition, to collar 23 and cam part 22, internal thread part 11 etc.
It is processed, and completes hollow camshaft 20.
Core can be and interconnecting piece 12, changes of section portion 13, the constant cross-section portion 14 of big cross-section 16, plug embedded division
15 corresponding shapes, plug embedded division 15 can also be processed after the casting.
In the present embodiment, changes of section portion 13, from axial one end towards axial another side, sectional area is in circle
The shape of tapered expansion, cone is linear, but the shape in changes of section portion 13 is not limited in present embodiment.Example
Such as, the cone shape in changes of section portion 13 may be the curved as its busbar draws circular arc.In addition it is also possible to be from axis
To one end towards axial another side, sectional area is in step-like widened shape.But under any circumstance, it should not set
Set such as the corner part of stress concentration or the corner with sharp crest line, changes of section portion 13 whole region and connecting
The connecting portion in portion 12 and big cross-section 16 is continuously preferred with face as smooth as possible.
Fig. 3 is the chart of the hollow camshaft 20 and the performance of existing hollow camshaft that compare the utility model.The midpoints Fig. 1
It is partly existing hollow camshaft 20 shown in scribing line, part shown in solid is the hollow camshaft 20 of the utility model.
The section factor at the middle sections Fig. 1 each position A, B, C, D, E, F, G, H, I is compared into (a) of display in figure 3.It will figure
The section second moment at the 1 each position middle section A, B, C, D, E, F, G, H, I compares (b) of display in figure 3.In any position, and
In row bar chart, be left white shown in left side bar chart show conventional example, right bars figure shown in grey shows the utility model
Embodiment.
In the present invention, due to being provided with big cross-section 16, the cavity compared with existing hollow part in hollow part 10
Volume become larger, but in any position, play roughly the same performance.
Claims (7)
1. a kind of hollow camshaft, which is characterized in that including：
Hollow part, to axially extending；
Internal thread part is formed in the inner surface of hollow part axial direction one end,
Wherein, the hollow part, including：
Changes of section portion, closer to another side, sectional area is from one end towards the other end compared with the internal thread part
Side expands；
Big cross-section is more than the internal thread compared with the changes of section portion in the whole region of another side, sectional area
Portion.
2. hollow camshaft according to claim 1, which is characterized in that
The big cross-section, including：
Plug embedded division is formed in the axial other end；
Constant cross-section portion is continued from the changes of section portion to the plug embedded division with same cross-sectional.
3. hollow camshaft according to claim 1, which is characterized in that the sectional area in the changes of section portion is in cone
Expand.
4. hollow camshaft according to any one of claims 1 to 3, which is characterized in that
Oriented separate axis direction multiple protruding portion outstanding is axially formed,
The changes of section portion is configured between the opposing end surface of the axial protruding portion adjacent to each other.
5. according to the hollow camshaft described in claim 4, which is characterized in that the protruding portion is to be configured at axially
It is interrupted the cam part of configuration or is axially interrupted the flange part of the axial both sides of the collar of configuration.
6. hollow camshaft according to claim 4, which is characterized in that
Bottommost in the end face of the protruding portion has, with towards lateral axial bending in radial direction and at its end portion
The portions R being connect with the cylindrical surface of the protruding portion side,
The changes of section portion is configured between the terminal part in the axial portions R adjacent to each other.
7. hollow camshaft according to claim 5, the changes of section portion is located at axial direction identical with the collar
In range.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017-023214 | 2017-02-10 | ||
| JP2017023214A JP6880800B2 (en) | 2017-02-10 | 2017-02-10 | Hollow camshaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208089364U true CN208089364U (en) | 2018-11-13 |
Family
ID=63173618
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820222330.9U Active CN208089364U (en) | 2017-02-10 | 2018-02-08 | A kind of hollow camshaft |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP6880800B2 (en) |
| CN (1) | CN208089364U (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63134806A (en) * | 1986-11-27 | 1988-06-07 | Nippon Piston Ring Co Ltd | Manufacture of hollow cam shaft |
| JPH01115803U (en) * | 1988-01-30 | 1989-08-04 | ||
| US5778841A (en) * | 1997-02-26 | 1998-07-14 | Cummins Engine Company, Inc. | Camshaft for internal combustion engines |
| JP3847428B2 (en) * | 1997-11-19 | 2006-11-22 | ヤマハ発動機株式会社 | Cylinder head structure of internal combustion engine |
-
2017
- 2017-02-10 JP JP2017023214A patent/JP6880800B2/en active Active
-
2018
- 2018-02-08 CN CN201820222330.9U patent/CN208089364U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2018128000A (en) | 2018-08-16 |
| JP6880800B2 (en) | 2021-06-02 |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder |
Address after: No. 21, No. 3, Dingmu, No. 1, Toshiba, Tokyo, Japan Patentee after: Mitsubishi Jidosha Kogyo Kabushiki Kaisha Address before: Japan Tokyo port, 33 No. 8 Chicago Patentee before: Mitsubishi Jidosha Kogyo Kabushiki Kaisha |
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| CP02 | Change in the address of a patent holder |