CN220118201U - Valve camshaft mechanism and engine - Google Patents
Valve camshaft mechanism and engine Download PDFInfo
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- CN220118201U CN220118201U CN202321620805.7U CN202321620805U CN220118201U CN 220118201 U CN220118201 U CN 220118201U CN 202321620805 U CN202321620805 U CN 202321620805U CN 220118201 U CN220118201 U CN 220118201U
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- 230000007246 mechanism Effects 0.000 title claims abstract description 33
- 230000001105 regulatory effect Effects 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008844 regulatory mechanism Effects 0.000 description 1
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- Valve-Gear Or Valve Arrangements (AREA)
- Valve Device For Special Equipments (AREA)
Abstract
The utility model discloses a valve camshaft mechanism, which comprises a cam mandrel and a cam body sleeved on the cam mandrel, wherein the cam body can be axially adjusted along the cam mandrel and can be mounted on the cam mandrel in a locking manner, and the cam body is axially provided with a plurality of cam parts in sequence, and the lift of each cam part is different; according to the utility model, through simply improving the outer contour of the traditional cam, a plurality of cam parts with different lift ranges are formed, and the cam parts matched with the valve are switched by matching with the driving of the regulating piece, so that the multi-gear valve lift range regulation is realized, the output power requirement of the engine in high-speed operation is met, the torque requirement of the engine in low-speed operation is also met, the structure of the whole lift range regulating mechanism is simplified, and the manufacturing cost can be effectively reduced.
Description
Technical Field
The utility model belongs to the field of valve cams, and particularly relates to a valve cam mechanism and an engine.
Background
The conventional structure for driving the same intake or exhaust valve is a single cam, and the single cam driving structure enables the valve lift of the engine to be fixed and invariable; thus, the balance can only be selected under the full working condition;
in order to adapt to the output power requirement of an engine in high-speed operation and the torque requirement in low-speed operation, the valve lift is required to be variable, the valve lift is increased in high-speed operation, the valve lift is reduced in low-speed operation, the existing adjusting mode is generally realized through a variable valve actuating mechanism, structures such as a rocker arm, an adjusting device and a guiding profile are required to be additionally arranged in the structure, and the valve lift is adjusted by adopting integral movement switching or groove profile switching; the whole structure is extremely complex and the manufacturing cost is high.
Therefore, there is a need to improve the existing valve lift adjusting mechanism, and to satisfy the adjusting function of the valve lift while simplifying the entire adjusting mechanism.
Disclosure of Invention
In view of the above, the utility model provides a valve camshaft mechanism and an engine, and the valve camshaft mechanism can meet the regulation function of valve lift by improving a cam, so that the structure of the whole regulation mechanism is greatly simplified, and the manufacturing cost can be effectively reduced.
The utility model provides a distribution camshaft mechanism, includes cam dabber and cover locates the cam body of cam dabber, the cam body can be followed cam dabber axial regulation and lockable mode and install in the cam dabber, the cam body has set gradually a plurality of cam portion along the axial, each the lift of cam portion is different.
Further, the end cams are arranged at the two axial ends of the cam body, and the cam body is driven by the end cams to adjust the axial position.
Further, the base diameters of the cam portions are the same and are coaxially arranged.
Further, the cam portion includes a high-speed cam portion and a low-speed cam portion, and a lift of the high-speed cam portion is greater than a lift of the low-speed cam portion.
Further, the inner wall of the cam body is provided with a plurality of positioning grooves which are matched with the cam parts one by one, the positioning grooves correspond to the cam body at the locking position of the cam mandrel, and the cam mandrel is provided with a positioning mechanism for axially positioning the cam body.
Further, positioning mechanism includes setting element and elastic component, the cam dabber is provided with the dabber locating hole, the setting element slidable sets up in the dabber locating hole, the elastic component is installed in the dabber locating hole and is cooperated the setting element to connect the installation, can apply radial to the effort that moves in the dabber location to the setting element when the cam body is driven along axial displacement.
Further, two cam bodies are arranged on the cam mandrel in an axial arrangement mode, and the cam bodies and the cam mandrel are matched through internal and external splines.
Further, the valve camshaft mechanism is installed in the engine, the valve camshaft mechanism further comprises a plurality of adjusting pieces installed on the engine box, each of the two axial ends of the cam body is provided with an adjusting piece, the adjusting pieces can be driven to stretch out and draw back along the radial direction of the cam mandrel to be close to or far away from the cam body, and when the adjusting pieces are close to the cam body, the adjusting pieces are matched with corresponding end face cams to drive the cam body to axially slide so as to switch cam portions matched with the valves.
The utility model also provides an engine, the valve timing cam shaft mechanism is arranged in the engine, the engine further comprises a plurality of adjusting pieces arranged on the engine box body, each adjusting piece is arranged at two axial ends of each cam body, the adjusting pieces can be driven to stretch along the radial direction of the cam mandrel to be close to or far away from the cam body, and when the adjusting pieces are close to the cam body, the adjusting pieces are matched with corresponding end face cams to drive the cam body to axially slide so as to be switched to be matched with the valve. The engine also includes structures such as a crankshaft, a cylinder, a crank, and a piston, and the engine has the same structure as the existing structure except that the engine is provided with a camshaft assembly in this embodiment.
The utility model has the beneficial effects that:
according to the utility model, through simply improving the outer contour of the traditional cam, a plurality of cam parts with different lift ranges are formed, and the cam parts matched with the valve are switched by matching with the driving of the regulating piece, so that the multi-gear valve lift range regulation is realized, the output power requirement of the engine in high-speed operation is met, the torque requirement of the engine in low-speed operation is also met, the structure of the whole lift range regulating mechanism is simplified, and the manufacturing cost can be effectively reduced.
Drawings
The utility model is further described below with reference to the drawings and examples.
FIG. 1 is a schematic view of a cam body;
FIG. 2 is a schematic view of a camshaft assembly;
FIG. 3 is a schematic view of a combined cross-sectional structure of a camshaft;
FIG. 4 is a schematic diagram of an engine configuration;
Detailed Description
The embodiment provides a valve camshaft mechanism, includes cam dabber 2 and cover locate the cam body 1 on the cam dabber 2, but cam body 1 is installed in the cam dabber along the axial regulation of cam dabber 2 and lockable mode, the cam body has set gradually a plurality of cam portion along the axial, and each the lift of cam portion is different. The cam body 1 is mounted on the cam mandrel 2 in a driving fit and axially sliding manner. As shown in fig. 2, a timing driven wheel 6 is installed on the cam mandrel 2 in a transmission fit manner, two cam bodies are installed on the cam mandrel, the cam bodies 1 and the cam mandrel can form an axial sliding fit through a flat key or other known modes, the cam bodies are driven to axially slide to a designated position along the cam mandrel 2 and then axially lock, and after sliding, the cam bodies switch cam parts matched with the air valves, so that the lift of the air valves is adjusted;
the lift of the cam portion refers to the maximum displacement of the follower in the cam stroke or return stroke; the cam parts can be provided with a plurality of cam parts, each cam part is a disc cam, each cam part is integrally formed, the lift ranges of each cam part are different, when different cam parts are matched with the valve, multi-gear valve lift range adjustment can be realized, and preferably, the lift ranges of each cam part are sequentially increased or decreased along the axial direction; taking two valve cams as an example in fig. 1 for explanation, because the lift of the high-speed cam part 1a is higher than that of the low-speed cam part 1b, when the high-speed cam part 1a is matched with a valve, the valve lift of the valve driven is larger, and the valve lift is used for the high-speed operation condition of the engine to meet the output power requirement of the high-speed operation of the engine, when the low-speed cam part 1b is matched with the valve, the valve lift of the valve driven is smaller, and the valve lift is used for the low-speed operation condition of the engine to meet the torque requirement of the low-speed operation of the engine.
In this embodiment, the end cams 1c are disposed at two axial ends of the cam body 1, and the cam body is driven by the end cams to perform axial position adjustment.
The end cam 1c may be a horizontal chamfer, as shown in fig. 4, when the adjusting member 5 is driven to move downwards at a constant speed, the end cam 1c is matched with the adjusting member 5 to drive the cam body 1 to slide axially, and the axial sliding speed of the cam body 1 is constant; of course, the end cam 1c may also be a curved surface that gradually changes along the circumferential direction, and when the adjusting member 5 is driven to move downward at a uniform speed, the axial sliding speed of the cam body 1 correspondingly changes according to the change of the curved surface of the end cam 1 c; because the cam body 1 is actually installed on the cam mandrel, the cam body 1 is of an annular structure, then the two axial ends of the cam body 1 are annular end faces, then due to the arrangement of end face cams, the two ends of the cam body 1 are of a cylindrical cam structure, the cam body 1 is a composite cam formed by a disc cam and a cylindrical cam, wherein the outline of the periphery of the cam body 1 is used as the disc cam to drive the valve to open and close in a matched mode with the valve, the two axial ends of the cam body 1 are cylindrical cams to be matched with the regulating piece 5, when the axial position of the regulating piece 5 is relatively fixed, after the regulating piece 5 is matched with an adjusting inclined plane, the cam body 1 can be driven to slide in the axial direction by the regulating piece 5 when rotating.
In this embodiment, the base diameters of the cam portions are the same and are coaxially arranged. In the explanation of the high-speed cam portion 1a and the low-speed cam portion 1b by way of example with reference to fig. 1, since the base diameters are the same and coaxially arranged, the base circular surfaces of the respective cam portions are coplanar; when the cam body 1 rotates, and when the base circle of the cam body contacts with the valve, the cam body is driven to axially slide at the moment, so that smooth switching of each cam part can be realized, and the switching of each cam part is facilitated.
In this embodiment, the cam portion includes a high-speed cam portion 1a and a low-speed cam portion 1b, where the lift of the high-speed cam portion is greater than that of the low-speed cam portion, and as shown in fig. 1, by providing two cam portions, switching between the corresponding lifts of the high speed and the low speed is achieved, so that the use requirement of the high speed and the low speed can be satisfied.
In this embodiment, the inner wall of the cam body 1 is provided with a plurality of positioning slots 1d which are matched with the cam parts one by one, the positioning slots 1d correspond to the cam body 1 at the locking position of the cam mandrel, the cam mandrel 2 is provided with a positioning mechanism for axially positioning the cam body, and the cam body 1 can be axially positioned by matching the positioning mechanism with the positioning mechanism through the positioning slots, in this embodiment, two inner positioning slots are provided, and the two inner positioning slots correspond to the positioning of the high-speed cam part 1a and the low-speed cam part 1b respectively; wherein the inner positioning groove is matched with the positioning piece 3 and the mandrel positioning hole 2a for use, and the specific matching structure is detailed in the following;
in this embodiment, the positioning mechanism includes positioning element 3 and elastic component 4, cam dabber 2 is provided with dabber locating hole 2a, positioning element 3 slidable sets up in the dabber locating hole, elastic component 4 installs in dabber locating hole 2a and cooperates the installation of positioning element 3 connection, can apply radial to the effort that removes in the dabber location to the positioning element when the driven along axial displacement of cam body.
Referring to fig. 3, a mandrel positioning hole 2a is formed in the cam mandrel 2, the upper end of the mandrel positioning hole 2a is open, the elastic member 4 adopts a cylindrical spiral spring, the positioning member 3 is a steel ball, the steel ball is connected to the upper end of the elastic member, and the spring presses the upper half part of the steel ball into the inner positioning groove 1d, so that the cam body is axially positioned relative to the cam mandrel; the inner positioning groove 1d is an arc-shaped groove, when the steel ball receives axial force, the steel ball can be separated from the inner positioning groove 1d along the arc-shaped edge of the inner positioning groove 1d, and the cam body can axially slide relative to the cam mandrel; the elastic member may also be a disc spring or other known elastic structures, and the positioning member may be a cylindrical structure with a semi-spherical end surface or other known structures, which are not described in detail.
In this embodiment, two cam bodies are mounted on the cam mandrel 2 in an axial arrangement, and the cam bodies and the cam mandrel are matched through internal and external splines. With reference to fig. 2, the cam mandrel has two raised large-diameter sections, which are external spline shafts, and the two cam bodies are of internal spline structures and are respectively mounted on the corresponding spline shafts.
The embodiment also provides an engine, install above-mentioned camshaft subassembly in the engine, still include installing a plurality of regulating part 5 on the engine box, every cam body 1 axial both ends respectively are provided with a regulating part, the regulating part can be driven and extend and contract in order to be close to or keep away from the cam body along cam dabber radial direction, the regulating part cooperates with corresponding terminal surface cam 1c when being close to the cam body in order to drive cam body axial slip and then switch and cooperate with the valve. As shown in fig. 4, the engine further includes a crankshaft, a cylinder, a crank, a piston, and the like, and the engine has the same structure as the existing structure, except that in this embodiment, the engine is provided with a cam shaft assembly, in which four adjusting members 5 are provided corresponding to the cam shaft, each two adjusting members are provided for one cam body, the adjusting members are of a columnar structure, and the adjusting members are driven downward to further cooperate with the corresponding end cams to drive the axial sliding of the cam body.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.
Claims (8)
1. An air distribution cam shaft mechanism which is characterized in that: the cam comprises a cam mandrel and a cam body sleeved on the cam mandrel, wherein the cam body can be axially adjusted along the cam mandrel and can be mounted on the cam mandrel in a locking mode, and a plurality of cam parts are sequentially arranged on the cam body along the axial direction, and the lift ranges of the cam parts are different.
2. A valve camshaft mechanism as claimed in claim 1, wherein: the axial both ends of cam body are provided with the face cam, and the cam body carries out axial position adjustment through face cam drive.
3. A valve camshaft mechanism as claimed in claim 1, wherein: the base circle diameters of the cam portions are the same and are coaxially arranged.
4. A valve camshaft mechanism as claimed in claim 1, wherein: the cam portion includes a high-speed cam portion and a low-speed cam portion, and a lift of the high-speed cam portion is greater than a lift of the low-speed cam portion.
5. A valve camshaft mechanism as claimed in claim 1, wherein: the cam body inner wall is provided with a plurality of interior positioning grooves which are matched with the cam parts one by one, the interior positioning grooves correspond to the cam body at the locking position of the cam mandrel, and the cam mandrel is provided with a positioning mechanism for axially positioning the cam body.
6. A valve train camshaft mechanism according to claim 5, wherein: the positioning mechanism comprises a positioning piece and an elastic piece, wherein the cam mandrel is provided with a mandrel positioning hole, the positioning piece is slidably arranged in the mandrel positioning hole, the elastic piece is arranged in the mandrel positioning hole and is connected with the positioning piece, and when the cam body is driven to axially move, acting force which radially moves towards the inside of the mandrel positioning can be applied to the positioning piece.
7. A valve train camshaft mechanism according to claim 6, wherein: and the cam mandrel is provided with two cam bodies in an axial arrangement manner, and the cam bodies are matched with the cam mandrel through internal and external splines.
8. An engine, characterized in that: the valve timing cam mechanism of any one of claims 1 to 7 is installed in the engine, and the valve timing cam mechanism further comprises a plurality of adjusting pieces installed on the engine box, wherein one adjusting piece is respectively arranged at each of two axial ends of the cam body, the adjusting pieces can be driven to stretch and retract along the radial direction of the cam mandrel to be close to or far away from the cam body, and when the adjusting pieces are close to the cam body, the adjusting pieces are matched with corresponding end face cams to drive the cam body to axially slide so as to be switched to be matched with the valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321620805.7U CN220118201U (en) | 2023-06-25 | 2023-06-25 | Valve camshaft mechanism and engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321620805.7U CN220118201U (en) | 2023-06-25 | 2023-06-25 | Valve camshaft mechanism and engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220118201U true CN220118201U (en) | 2023-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321620805.7U Active CN220118201U (en) | 2023-06-25 | 2023-06-25 | Valve camshaft mechanism and engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220118201U (en) |
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2023
- 2023-06-25 CN CN202321620805.7U patent/CN220118201U/en active Active
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